Align lease ending validation flows (#54)

backend/src/main/java/fr/nessar/lmnporganizer/rental/adapter/in/web/lease/LeaseEndingApi.java

@@ -19,14 +19,22 @@ import java.util.List;
 final class LeaseEndingApi {
 private LeaseEndingApi() {}
 
+record OperationError(String message) {}
+
+record ValidationError(String code, List<FieldError> errors) {}
+
+record FieldError(String field, String code) {}
+
 record StateResponse(
 	String leaseId,
 	boolean supported,
 	String unsupportedReason,
 	LeaseEndPhase phase,
 	LeaseType leaseType,
+	LocalDate leaseStartOn,
 	LocalDate fixedEndOn,
 	LocalDate effectiveEndOn,
+	long maxEvidenceBytes,
 	boolean correctionRequired,
 	List<NoticeResponse> notices,
 	AgreedEarlyEndResponse agreedEarlyEnd,
@@ -41,8 +49,10 @@ record StateResponse(
 		state.unsupportedReason().orElse(null),
 		state.phase(),
 		state.leaseType(),
+		state.leaseStartOn(),
 		state.fixedEndOn().orElse(null),
 		state.effectiveEndOn().orElse(null),
+		state.maxEvidenceBytes(),
 		state.correctionRequired(),
 		history.notices().stream().map(notice -> NoticeResponse.from(notice, history)).toList(),
 		history.latestAgreement().map(AgreedEarlyEndResponse::from).orElse(null),

backend/src/main/java/fr/nessar/lmnporganizer/rental/adapter/in/web/lease/LeaseEndingController.java

@@ -3,12 +3,16 @@ package fr.nessar.lmnporganizer.rental.adapter.in.web.lease;
 import fr.nessar.lmnporganizer.rental.adapter.in.web.common.AuthenticatedLandlord;
 import fr.nessar.lmnporganizer.rental.application.lease.LeaseEndingService;
 import fr.nessar.lmnporganizer.rental.application.shared.AttachmentStorageFailure;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingConflict;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingValidationFailure;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseId;
 import fr.nessar.lmnporganizer.rental.domain.lease.NoticeDeliveryMode;
 import fr.nessar.lmnporganizer.rental.domain.lease.TenantNoticeId;
 import jakarta.validation.Valid;
+import jakarta.validation.constraints.AssertTrue;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
 import java.io.IOException;
 import java.time.DateTimeException;
 import java.time.LocalDate;
@@ -18,8 +22,11 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.security.oauth2.core.oidc.user.OidcUser;
+import org.springframework.web.bind.MissingServletRequestParameterException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -28,7 +35,9 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RequestPart;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
 import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.multipart.support.MissingServletRequestPartException;
 
 @RestController("rentalLeaseEndingController")
 @RequestMapping("/api/leases/{leaseId}/end")
@@ -42,6 +51,34 @@ public LeaseEndingController(
 	this.authenticatedLandlord = authenticatedLandlord;
 }
 
+@ExceptionHandler(LeaseEndingConflict.class)
+ResponseEntity<LeaseEndingApi.OperationError> conflict(LeaseEndingConflict failure) {
+	return ResponseEntity.status(HttpStatus.CONFLICT)
+		.body(new LeaseEndingApi.OperationError(failure.getMessage()));
+}
+
+@ExceptionHandler(LeaseEndingValidationFailure.class)
+ResponseEntity<LeaseEndingApi.ValidationError> invalid(LeaseEndingValidationFailure failure) {
+	return ResponseEntity.badRequest()
+		.body(
+			new LeaseEndingApi.ValidationError(
+				"validation_failed",
+				failure.errors().stream()
+					.map(error -> new LeaseEndingApi.FieldError(error.field(), error.code()))
+					.toList()));
+}
+
+@ExceptionHandler({
+	MissingServletRequestParameterException.class,
+	MissingServletRequestPartException.class,
+	MethodArgumentTypeMismatchException.class,
+	HttpMessageNotReadableException.class
+})
+ResponseEntity<LeaseEndingApi.OperationError> invalidRequest() {
+	return ResponseEntity.badRequest()
+		.body(new LeaseEndingApi.OperationError("La requête de fin de bail est invalide."));
+}
+
 @GetMapping
 LeaseEndingApi.StateResponse state(
 	@AuthenticationPrincipal OidcUser principal,
@@ -205,7 +242,7 @@ private static ZoneId zone(String value) {
 	try {
 	return ZoneId.of(value);
 	} catch (DateTimeException failure) {
-	throw new IllegalArgumentException("Le fuseau horaire IANA est invalide.", failure);
+	throw new LeaseEndingValidationFailure("timeZone", "iana_time_zone");
 	}
 }
 
@@ -222,13 +259,19 @@ private static String safeFileName(String value) {
 }
 
 record WithdrawalRequest(
-	@NotBlank String timeZone, @NotNull LocalDate acceptedOn, @NotBlank String reason) {}
+	@NotBlank String timeZone,
+	@NotNull LocalDate acceptedOn,
+	@NotBlank @Size(max = 500) String reason) {}
 
 record InvalidationRequest(
-	@NotBlank String timeZone, @NotNull LocalDate invalidatedOn, @NotBlank String reason) {}
+	@NotBlank String timeZone,
+	@NotNull LocalDate invalidatedOn,
+	@NotBlank @Size(max = 500) String reason) {}
 
 record AgreedEndRequest(
-	@NotBlank String timeZone, @NotNull LocalDate endOn, @NotBlank String reason) {}
+	@NotBlank String timeZone,
+	@NotNull LocalDate endOn,
+	@NotBlank @Size(max = 500) String reason) {}
 
-record ClosureRequest(@NotBlank String timeZone, boolean confirmed) {}
+record ClosureRequest(@NotBlank String timeZone, @AssertTrue boolean confirmed) {}
 }

backend/src/main/java/fr/nessar/lmnporganizer/rental/application/lease/LeaseEndingService.java

@@ -14,6 +14,8 @@ import fr.nessar.lmnporganizer.rental.domain.lease.ApartmentOccupancy;
 import fr.nessar.lmnporganizer.rental.domain.lease.ApartmentOccupancyRepository;
 import fr.nessar.lmnporganizer.rental.domain.lease.Lease;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseActionAudit;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingConflict;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingValidationFailure;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseId;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseRepository;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseRuleViolation;
@@ -92,7 +94,7 @@ public LeaseEndingState recordNotice(
 	EvidenceUpload evidence) {
 	Objects.requireNonNull(request);
 	if (evidence == null && !request.missingEvidenceConfirmed()) {
-	throw new LeaseRuleViolation("L'absence de justificatif doit être confirmée.");
+	throw new LeaseEndingValidationFailure("missingEvidenceConfirmed", "required");
 	}
 	TenantNoticeId noticeId = new TenantNoticeId(identifiers.next());
 	StoredEvidence stored = evidence == null ? null : store(evidence);
@@ -191,7 +193,7 @@ public LeaseEndingState close(
 				.filter(PropertyConditionReport::finalized)
 				.orElseThrow(
 					() ->
-						new LeaseRuleViolation(
+						new LeaseEndingConflict(
 							"Un état des lieux de sortie finalisé est requis pour clôturer le bail."));
 		lease.close(
 			exitReport.occurredOn(),
@@ -295,8 +297,10 @@ private LeaseEndingState state(
 				"La fin de bail locataire n'est pas prise en charge pour une colocation."),
 		lease.endPhaseOn(today),
 		lease.leaseType(),
+		lease.period().startDate(),
 		lease.fixedEndOn(),
 		lease.contractEndOn(),
+		maxEvidenceBytes,
 		dues.stream().anyMatch(RentDue::correctionRequired),
 		reports
 			.find(landlordId, lease.id(), PropertyConditionReportType.EXIT)
@@ -339,7 +343,7 @@ private StoredEvidence store(EvidenceUpload upload) {
 	byte[] content =
 		Objects.requireNonNull(upload.content(), "Evidence content is required.").clone();
 	if (content.length == 0) {
-	throw new LeaseRuleViolation("Le justificatif est vide.");
+	throw new LeaseEndingValidationFailure("evidence", "empty");
 	}
 	if (content.length > maxEvidenceBytes) {
 	throw new AttachmentTooLarge(maxEvidenceBytes);

backend/src/main/java/fr/nessar/lmnporganizer/rental/application/lease/LeaseEndingState.java

@@ -14,8 +14,10 @@ public record LeaseEndingState(
 	Optional<String> unsupportedReason,
 	LeaseEndPhase phase,
 	LeaseType leaseType,
+	LocalDate leaseStartOn,
 	Optional<LocalDate> fixedEndOn,
 	Optional<LocalDate> effectiveEndOn,
+	long maxEvidenceBytes,
 	boolean correctionRequired,
 	Optional<ExitConditionReport> exitConditionReport,
 	LeaseEndingHistory history) {
@@ -24,8 +26,12 @@ public LeaseEndingState {
 	unsupportedReason = unsupportedReason == null ? Optional.empty() : unsupportedReason;
 	Objects.requireNonNull(phase);
 	Objects.requireNonNull(leaseType);
+	Objects.requireNonNull(leaseStartOn);
 	fixedEndOn = fixedEndOn == null ? Optional.empty() : fixedEndOn;
 	effectiveEndOn = effectiveEndOn == null ? Optional.empty() : effectiveEndOn;
+	if (maxEvidenceBytes <= 0) {
+	throw new IllegalArgumentException("Maximum evidence size must be positive.");
+	}
 	exitConditionReport = exitConditionReport == null ? Optional.empty() : exitConditionReport;
 	Objects.requireNonNull(history);
 }

backend/src/main/java/fr/nessar/lmnporganizer/rental/domain/lease/Lease.java

@@ -507,18 +507,17 @@ public TenantNotice recordTenantNotice(TenantNoticeCommand command, LeaseActionA
 	Objects.requireNonNull(command);
 	Objects.requireNonNull(audit);
 	if (command.receivedOn().isAfter(command.today())) {
-	throw new LeaseRuleViolation("La date de réception du congé ne peut pas être future.");
+	throw new LeaseEndingValidationFailure("receivedOn", "not_future");
 	}
 	if (command.receivedOn().isBefore(command.today()) && !command.lateRegistrationConfirmed()) {
-	throw new LeaseRuleViolation("La saisie tardive du congé doit être confirmée.");
+	throw new LeaseEndingValidationFailure("lateRegistrationConfirmed", "required");
 	}
 	if (command.requestedDepartureOn().isBefore(command.receivedOn())) {
-	throw new LeaseRuleViolation(
-		"La date de départ demandée ne peut pas précéder la réception du congé.");
+	throw new LeaseEndingValidationFailure("requestedDepartureOn", "after_or_equal_received_on");
 	}
 	if (command.deliveryMode() == NoticeDeliveryMode.OTHER
 		&& !command.nonStandardDeliveryConfirmed()) {
-	throw new LeaseRuleViolation("Le mode de remise non standard doit être confirmé.");
+	throw new LeaseEndingValidationFailure("nonStandardDeliveryConfirmed", "required");
 	}
 	TenantNotice notice =
 		new TenantNotice(
@@ -547,7 +546,7 @@ public NoticeWithdrawal acceptNoticeWithdrawal(
 		endingHistory
 			.notice(noticeId)
 			.orElseThrow(() -> new LeaseRuleViolation("Le congé locataire est introuvable."));
-	validateAdministrativeFactDate(acceptedOn, today, notice.receivedOn());
+	validateAdministrativeFactDate(acceptedOn, today, notice.receivedOn(), "acceptedOn");
 	return endingHistory.withdraw(noticeId, acceptedOn, reason, audit);
 }
 
@@ -562,7 +561,7 @@ public NoticeInvalidation invalidateNotice(
 		endingHistory
 			.notice(noticeId)
 			.orElseThrow(() -> new LeaseRuleViolation("Le congé locataire est introuvable."));
-	validateAdministrativeFactDate(invalidatedOn, today, notice.receivedOn());
+	validateAdministrativeFactDate(invalidatedOn, today, notice.receivedOn(), "invalidatedOn");
 	return endingHistory.invalidate(noticeId, invalidatedOn, reason, audit);
 }
 
@@ -571,11 +570,11 @@ public AgreedEarlyLeaseEnd recordAgreedEarlyEnd(
 	requireActiveEndingSupported();
 	Objects.requireNonNull(endOn, "Agreed end date is required.");
 	if (endOn.isBefore(period.startDate())) {
-	throw new LeaseRuleViolation("La fin convenue ne peut pas précéder le début du bail.");
+	throw new LeaseEndingValidationFailure("endOn", "after_or_equal_lease_start");
 	}
 	Optional<LocalDate> currentEnd = contractEndOn();
 	if (currentEnd.isPresent() && !endOn.isBefore(currentEnd.orElseThrow())) {
-	throw new LeaseRuleViolation("La fin convenue doit avancer la fin de bail actuelle.");
+	throw new LeaseEndingValidationFailure("endOn", "before_current_end");
 	}
 	return endingHistory.agree(endOn, reason, audit);
 }
@@ -597,11 +596,11 @@ public LeaseClosure close(
 	LocalDate endOn =
 		contractEndOn()
 			.orElseThrow(
-				() -> new LeaseRuleViolation("Le bail n'a pas encore de fin contractuelle."));
+				() -> new LeaseEndingConflict("Le bail n'a pas encore de fin contractuelle."));
 	Objects.requireNonNull(keysReturnedOn, "Keys return date is required.");
 	Objects.requireNonNull(today, "Current civil date is required.");
 	if (today.isBefore(endOn)) {
-	throw new LeaseRuleViolation("Le bail ne peut être clôturé avant sa fin contractuelle.");
+	throw new LeaseEndingConflict("Le bail ne peut être clôturé avant sa fin contractuelle.");
 	}
 	if (keysReturnedOn.isBefore(period.startDate()) || keysReturnedOn.isAfter(today)) {
 	throw new LeaseRuleViolation(
@@ -682,25 +681,24 @@ public LeaseEndPhase endPhaseOn(LocalDate date) {
 
 private void requireActiveEndingSupported() {
 	if (status != LeaseStatus.ACTIVE) {
-	throw new LeaseRuleViolation("Seul un bail actif peut recevoir un fait de fin de bail.");
+	throw new LeaseEndingConflict("Seul un bail actif peut recevoir un fait de fin de bail.");
 	}
 	requireEndingSupported();
 }
 
 private void requireEndingSupported() {
 	if (!endingSupported()) {
-	throw new LeaseRuleViolation(
+	throw new LeaseEndingConflict(
 		"La fin de bail locataire n'est pas prise en charge pour une colocation.");
 	}
 }
 
 private static void validateAdministrativeFactDate(
-	LocalDate factOn, LocalDate today, LocalDate noticeReceivedOn) {
+	LocalDate factOn, LocalDate today, LocalDate noticeReceivedOn, String field) {
 	Objects.requireNonNull(factOn, "Administrative fact date is required.");
 	Objects.requireNonNull(today, "Current civil date is required.");
 	if (factOn.isBefore(noticeReceivedOn) || factOn.isAfter(today)) {
-	throw new LeaseRuleViolation(
-		"La date administrative doit suivre le congé et ne peut pas être future.");
+	throw new LeaseEndingValidationFailure(field, "between_notice_received_on_and_today");
 	}
 }
 

backend/src/main/java/fr/nessar/lmnporganizer/rental/domain/lease/LeaseEndingConflict.java

@@ -0,0 +1,7 @@
+package fr.nessar.lmnporganizer.rental.domain.lease;
+
+public final class LeaseEndingConflict extends RuntimeException {
+public LeaseEndingConflict(String message) {
+	super(message);
+}
+}

backend/src/main/java/fr/nessar/lmnporganizer/rental/domain/lease/LeaseEndingHistory.java

@@ -51,7 +51,7 @@ TenantNotice recordNotice(TenantNotice notice) {
 	throw new LeaseRuleViolation("Ce congé existe déjà.");
 	}
 	if (activeNotice().isPresent()) {
-	throw new LeaseRuleViolation("Un congé locataire est déjà actif pour ce bail.");
+	throw new LeaseEndingConflict("Un congé locataire est déjà actif pour ce bail.");
 	}
 	notices = appended(notices, notice);
 	return notice;
@@ -94,7 +94,7 @@ NoticeEvidenceVersion appendEvidence(
 
 LeaseClosure close(LocalDate keysReturnedOn, LeaseActionAudit audit) {
 	if (closure != null) {
-	throw new LeaseRuleViolation("Le bail est déjà clôturé.");
+	throw new LeaseEndingConflict("Le bail est déjà clôturé.");
 	}
 	closure = new LeaseClosure(keysReturnedOn, audit);
 	return closure;
@@ -157,7 +157,7 @@ private TenantNotice requireActive(TenantNoticeId noticeId) {
 		find(noticeId)
 			.orElseThrow(() -> new LeaseRuleViolation("Le congé locataire est introuvable."));
 	if (statusOf(noticeId) != TenantNoticeStatus.ACTIVE) {
-	throw new LeaseRuleViolation("Seul un congé actif peut être modifié.");
+	throw new LeaseEndingConflict("Seul un congé actif peut être modifié.");
 	}
 	return notice;
 }
@@ -215,11 +215,11 @@ private void requireKnownNotice(TenantNoticeId noticeId) {
 
 static String requiredReason(String reason) {
 	if (reason == null || reason.isBlank()) {
-	throw new LeaseRuleViolation("La raison est obligatoire.");
+	throw new LeaseEndingValidationFailure("reason", "required");
 	}
 	String value = reason.trim();
 	if (value.length() > 500) {
-	throw new LeaseRuleViolation("La raison ne peut pas dépasser 500 caractères.");
+	throw new LeaseEndingValidationFailure("reason", "max_length");
 	}
 	return value;
 }

backend/src/main/java/fr/nessar/lmnporganizer/rental/domain/lease/LeaseEndingValidationFailure.java

@@ -0,0 +1,18 @@
+package fr.nessar.lmnporganizer.rental.domain.lease;
+
+import java.util.List;
+
+public final class LeaseEndingValidationFailure extends RuntimeException {
+private final List<FieldError> errors;
+
+public LeaseEndingValidationFailure(String field, String code) {
+	super("La demande de fin de bail est invalide.");
+	this.errors = List.of(new FieldError(field, code));
+}
+
+public List<FieldError> errors() {
+	return errors;
+}
+
+public record FieldError(String field, String code) {}
+}

backend/src/main/java/fr/nessar/lmnporganizer/rental/domain/lease/TenantNotice.java

@@ -33,14 +33,13 @@ public TenantNotice {
 	ruleVersion = ruleVersion.trim();
 	otherDeliveryMode = optional(otherDeliveryMode);
 	if (otherDeliveryMode != null && otherDeliveryMode.length() > 200) {
-	throw new LeaseRuleViolation(
-		"Le libellé du mode de remise ne peut pas dépasser 200 caractères.");
+	throw new LeaseEndingValidationFailure("otherDeliveryMode", "max_length");
 	}
 	if (deliveryMode == NoticeDeliveryMode.OTHER && otherDeliveryMode == null) {
-	throw new LeaseRuleViolation("Le mode de remise alternatif est obligatoire.");
+	throw new LeaseEndingValidationFailure("otherDeliveryMode", "required");
 	}
 	if (deliveryMode != NoticeDeliveryMode.OTHER && otherDeliveryMode != null) {
-	throw new LeaseRuleViolation("Le détail du mode de remise est réservé au mode OTHER.");
+	throw new LeaseEndingValidationFailure("otherDeliveryMode", "forbidden");
 	}
 }
 

backend/src/test/java/fr/nessar/lmnporganizer/rental/adapter/in/web/lease/LeaseEndingWebTest.java

@@ -29,6 +29,8 @@ import fr.nessar.lmnporganizer.rental.domain.landlord.LandlordId;
 import fr.nessar.lmnporganizer.rental.domain.lease.Lease;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseActionAudit;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndPhase;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingConflict;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingValidationFailure;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseId;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseSnapshot;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseType;
@@ -102,6 +104,8 @@ void getRequiresAValidIanaTimeZoneAndExposesTheCanonicalAppendOnlyHistory() thro
 				.with(landlord()))
 		.andExpect(status().isOk())
 		.andExpect(jsonPath("$.phase").value("NOTICE_PERIOD"))
+		.andExpect(jsonPath("$.leaseStartOn").value("2026-01-01"))
+		.andExpect(jsonPath("$.maxEvidenceBytes").value(262144000))
 		.andExpect(jsonPath("$.notices[0].ruleVersion").value("2026-07"))
 		.andExpect(jsonPath("$.notices[0].recordedWithoutEvidenceConfirmed").value(true))
 		.andExpect(jsonPath("$.notices[0].authorId").value("subject-1"))
@@ -115,6 +119,50 @@ void getRequiresAValidIanaTimeZoneAndExposesTheCanonicalAppendOnlyHistory() thro
 	verify(endings).state(LANDLORD_ID, LEASE_ID, ZoneId.of("America/Los_Angeles"));
 }
 
+@Test
+void lifecycleConflictsRemainDistinctFromRequestValidation() throws Exception {
+	when(endings.recordAgreedEarlyEnd(any(), any(), any(), any()))
+		.thenThrow(
+			new LeaseEndingConflict("La fin convenue doit avancer la fin de bail actuelle."));
+
+	mockMvc
+		.perform(
+			post("/api/leases/lease-1/end/agreed-early-end")
+				.with(landlord())
+				.with(csrf())
+				.contentType(MediaType.APPLICATION_JSON)
+				.content(
+					"""
+					{"timeZone":"Europe/Paris","endOn":"2026-08-18","reason":"Accord écrit"}
+					"""))
+		.andExpect(status().isConflict())
+		.andExpect(
+			jsonPath("$.message").value("La fin convenue doit avancer la fin de bail actuelle."));
+}
+
+@Test
+void domainValidationUsesStableFieldPathsAndCodes() throws Exception {
+	when(endings.recordNotice(any(), any(), any(), any(), any()))
+		.thenThrow(new LeaseEndingValidationFailure("receivedOn", "not_future"));
+
+	mockMvc
+		.perform(
+			multipart("/api/leases/lease-1/end/notices")
+				.param("timeZone", "Europe/Paris")
+				.param("receivedOn", "2026-07-20")
+				.param("requestedDepartureOn", "2026-08-20")
+				.param("deliveryMode", "REGISTERED_LETTER")
+				.param("lateRegistrationConfirmed", "false")
+				.param("nonStandardDeliveryConfirmed", "false")
+				.param("missingEvidenceConfirmed", "true")
+				.with(landlord())
+				.with(csrf()))
+		.andExpect(status().isBadRequest())
+		.andExpect(jsonPath("$.code").value("validation_failed"))
+		.andExpect(jsonPath("$.errors[0].field").value("receivedOn"))
+		.andExpect(jsonPath("$.errors[0].code").value("not_future"));
+}
+
 @Test
 void noticeMultipartForwardsTimezoneEvidenceAttestationAndAuthenticatedAuthor() throws Exception {
 	when(endings.recordNotice(any(), any(), any(), any(), any())).thenReturn(state());
@@ -310,8 +358,10 @@ private static LeaseEndingState state() {
 		Optional.empty(),
 		LeaseEndPhase.NOTICE_PERIOD,
 		LeaseType.STANDARD,
+		LocalDate.of(2026, 1, 1),
 		Optional.empty(),
 		Optional.of(LocalDate.of(2026, 8, 18)),
+		250L * 1024 * 1024,
 		false,
 		Optional.of(new LeaseEndingState.ExitConditionReport(LocalDate.of(2026, 8, 18), true)),
 		lease.endingHistory());

backend/src/test/java/fr/nessar/lmnporganizer/rental/application/lease/LeaseEndingServiceTest.java

@@ -22,6 +22,8 @@ import fr.nessar.lmnporganizer.rental.domain.lease.ApartmentOccupancyRepository;
 import fr.nessar.lmnporganizer.rental.domain.lease.Lease;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseActionAudit;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndPhase;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingConflict;
+import fr.nessar.lmnporganizer.rental.domain.lease.LeaseEndingValidationFailure;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseId;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseRepository;
 import fr.nessar.lmnporganizer.rental.domain.lease.LeaseRuleViolation;
@@ -118,7 +120,7 @@ void noticeWithoutEvidenceRequiresTheExplicitAttestation() {
 			storage);
 
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			service.recordNotice(
 				LANDLORD_ID,
@@ -189,7 +191,7 @@ void civilTodayIsComputedInTheLandlordSuppliedTimeZoneWithoutConvertingTheEntere
 			boundaryClock);
 
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lasVegasService.recordNotice(
 				LANDLORD_ID,
@@ -459,7 +461,7 @@ void closingRejectsAnUnfinalizedExitReport() {
 			reports);
 
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingConflict.class,
 		() ->
 			service.close(
 				LANDLORD_ID,

backend/src/test/java/fr/nessar/lmnporganizer/rental/domain/lease/LeaseEndingTest.java

@@ -56,7 +56,7 @@ void noticeHonorsTheRequestedLaterDepartureAndValidatesCivilDateConfirmations()
 	Lease lease = activeLease(LeaseType.STANDARD, List.of(TENANT_ID));
 
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lease.recordTenantNotice(
 				notice(
@@ -69,7 +69,7 @@ void noticeHonorsTheRequestedLaterDepartureAndValidatesCivilDateConfirmations()
 					false),
 				AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lease.recordTenantNotice(
 				notice(
@@ -82,7 +82,7 @@ void noticeHonorsTheRequestedLaterDepartureAndValidatesCivilDateConfirmations()
 					false),
 				AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lease.recordTenantNotice(
 				notice(
@@ -95,7 +95,7 @@ void noticeHonorsTheRequestedLaterDepartureAndValidatesCivilDateConfirmations()
 					false),
 				AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lease.recordTenantNotice(
 				notice(
@@ -108,7 +108,7 @@ void noticeHonorsTheRequestedLaterDepartureAndValidatesCivilDateConfirmations()
 					true),
 				AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() ->
 			lease.recordTenantNotice(
 				notice(
@@ -161,7 +161,7 @@ void studentFixedEndCapsAnEarlierNoticeAndAllEndingCommandsRejectSharedLeases()
 	assertFalse(shared.endingSupported());
 	assertEquals(fixedEnd, shared.contractEndOn().orElseThrow());
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingConflict.class,
 		() ->
 			shared.recordTenantNotice(
 				notice(
@@ -174,7 +174,7 @@ void studentFixedEndCapsAnEarlierNoticeAndAllEndingCommandsRejectSharedLeases()
 					false),
 				AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingConflict.class,
 		() -> shared.recordAgreedEarlyEnd(TODAY.plusMonths(1), "Accord", AUDIT));
 }
 
@@ -290,7 +290,7 @@ void withdrawalAndInvalidationAppendAuditFactsWithoutErasingNotices() {
 	assertEquals(1, lease.endingHistory().withdrawals().size());
 	assertEquals(1, lease.endingHistory().invalidations().size());
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingConflict.class,
 		() ->
 			lease.acceptNoticeWithdrawal(
 				new TenantNoticeId("invalidated"),
@@ -317,11 +317,14 @@ void agreedEarlyEndWorksWithoutNoticeAndCanShortenAnExistingNotice() {
 			false,
 			false),
 		AUDIT);
+	LeaseEndingValidationFailure noChange =
 		assertThrows(
-		LeaseRuleViolation.class,
+			LeaseEndingValidationFailure.class,
 			() -> lease.recordAgreedEarlyEnd(LocalDate.of(2026, 9, 30), "Sans effet", AUDIT));
+	assertEquals("endOn", noChange.errors().getFirst().field());
+	assertEquals("before_current_end", noChange.errors().getFirst().code());
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() -> lease.recordAgreedEarlyEnd(LocalDate.of(2026, 10, 1), "Repousse la fin", AUDIT));
 	lease.recordAgreedEarlyEnd(LocalDate.of(2026, 8, 31), "Accord postérieur au congé", AUDIT);
 
@@ -347,10 +350,10 @@ void evidenceIsVersionedAndEveryReplacementRequiresAReason() {
 	NoticeEvidenceVersion first = lease.appendNoticeEvidence(noticeId, firstFile, null, AUDIT);
 	assertEquals(1, first.version());
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() -> lease.appendNoticeEvidence(noticeId, replacement, " ", AUDIT));
 	assertThrows(
-		LeaseRuleViolation.class,
+		LeaseEndingValidationFailure.class,
 		() -> lease.appendNoticeEvidence(noticeId, replacement, "x".repeat(501), AUDIT));
 	NoticeEvidenceVersion second =
 		lease.appendNoticeEvidence(noticeId, replacement, "Document corrigé", AUDIT);

frontend/src/app/components/lease-end-notice-card/lease-end-notice-card.html

@@ -159,17 +159,45 @@
 				>
 					<fieldset [disabled]="withdrawalPending()">
 						<legend>Accepter un retrait</legend>
-						<label
-							><span>Date d’acceptation</span
-							><input type="date" [formField]="withdrawalForm.acceptedOn"
-						/></label>
+						<label>
+							<span>Date d’acceptation</span>
+							<input
+								id="withdrawal-date"
+								type="date"
+								[formField]="withdrawalForm.acceptedOn"
+								(input)="withdrawalFieldChanged.emit('acceptedOn')"
+							/>
+						</label>
+						@if (withdrawalDateError()) {
+							<p class="operation-error" role="alert">{{ withdrawalDateError() }}</p>
+						}
+						@if (serverError(withdrawalFieldErrors(), 'acceptedOn')) {
+							<p class="operation-error" role="alert">
+								{{ serverError(withdrawalFieldErrors(), 'acceptedOn') }}
+							</p>
+						}
 						<label
 							><span>Raison</span
-							><textarea rows="2" [formField]="withdrawalForm.reason"></textarea>
+							><textarea
+								id="withdrawal-reason"
+								rows="2"
+								[formField]="withdrawalForm.reason"
+								(input)="withdrawalFieldChanged.emit('reason')"
+							></textarea>
 						</label>
-						@if (withdrawalError() || withdrawalOperationError()) {
+						@if (withdrawalReasonError()) {
 							<p class="operation-error" role="alert">
-								{{ withdrawalError() || withdrawalOperationError() }}
+								{{ withdrawalReasonError() }}
+							</p>
+						}
+						@if (serverError(withdrawalFieldErrors(), 'reason')) {
+							<p class="operation-error" role="alert">
+								{{ serverError(withdrawalFieldErrors(), 'reason') }}
+							</p>
+						}
+						@if (withdrawalOperationError()) {
+							<p class="operation-error" role="alert">
+								{{ withdrawalOperationError() }}
 							</p>
 						}
 						<button mat-stroked-button type="submit" [disabled]="withdrawalPending()">
@@ -184,17 +212,47 @@
 				>
 					<fieldset [disabled]="invalidationPending()">
 						<legend>Invalider administrativement</legend>
-						<label
-							><span>Date d’invalidation</span
-							><input type="date" [formField]="invalidationForm.invalidatedOn"
-						/></label>
+						<label>
+							<span>Date d’invalidation</span>
+							<input
+								id="invalidation-date"
+								type="date"
+								[formField]="invalidationForm.invalidatedOn"
+								(input)="invalidationFieldChanged.emit('invalidatedOn')"
+							/>
+						</label>
+						@if (invalidationDateError()) {
+							<p class="operation-error" role="alert">
+								{{ invalidationDateError() }}
+							</p>
+						}
+						@if (serverError(invalidationFieldErrors(), 'invalidatedOn')) {
+							<p class="operation-error" role="alert">
+								{{ serverError(invalidationFieldErrors(), 'invalidatedOn') }}
+							</p>
+						}
 						<label
 							><span>Raison</span
-							><textarea rows="2" [formField]="invalidationForm.reason"></textarea>
+							><textarea
+								id="invalidation-reason"
+								rows="2"
+								[formField]="invalidationForm.reason"
+								(input)="invalidationFieldChanged.emit('reason')"
+							></textarea>
 						</label>
-						@if (invalidationError() || invalidationOperationError()) {
+						@if (invalidationReasonError()) {
 							<p class="operation-error" role="alert">
-								{{ invalidationError() || invalidationOperationError() }}
+								{{ invalidationReasonError() }}
+							</p>
+						}
+						@if (serverError(invalidationFieldErrors(), 'reason')) {
+							<p class="operation-error" role="alert">
+								{{ serverError(invalidationFieldErrors(), 'reason') }}
+							</p>
+						}
+						@if (invalidationOperationError()) {
+							<p class="operation-error" role="alert">
+								{{ invalidationOperationError() }}
 							</p>
 						}
 						<button mat-stroked-button type="submit" [disabled]="invalidationPending()">

frontend/src/app/components/lease-end-notice-card/lease-end-notice-card.spec.ts

@@ -50,6 +50,8 @@ describe('LeaseEndNoticeCard', () => {
 		fixture.componentRef.setInput('leaseId', 'lease-1');
 		fixture.componentRef.setInput('notice', notice);
 		fixture.componentRef.setInput('timeZone', 'Europe/Paris');
+		fixture.componentRef.setInput('today', '2026-07-20');
+		fixture.componentRef.setInput('maxEvidenceBytes', 1024);
 		fixture.componentRef.setInput('lifecycleMutationsEnabled', true);
 		fixture.componentRef.setInput('evidenceUploadEnabled', true);
 		fixture.componentRef.setInput('withdrawalPending', false);

frontend/src/app/components/lease-end-notice-card/lease-end-notice-card.ts

@@ -1,4 +1,4 @@
-import { Component, inject, input, output, signal } from '@angular/core';
+import { Component, effect, ElementRef, inject, input, output, signal } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { FormField, FormRoot, form, maxLength } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
@@ -11,6 +11,7 @@ import {
 	LeaseEndService,
 	NoticeDeliveryMode,
 } from '../../services/lease-end.service';
+import { FieldValidationError } from '../../services/http-error-message';
 
 export interface NoticeAction<T> {
 	noticeId: string;
@@ -24,10 +25,13 @@ export interface NoticeAction<T> {
 	styleUrl: './lease-end-notice-card.css',
 })
 export class LeaseEndNoticeCard {
+	private readonly element = inject(ElementRef<HTMLElement>);
 	readonly endService = inject(LeaseEndService);
 	readonly leaseId = input.required<string>();
 	readonly notice = input.required<LeaseEndNotice>();
 	readonly timeZone = input.required<string>();
+	readonly today = input.required<string>();
+	readonly maxEvidenceBytes = input.required<number>();
 	readonly lifecycleMutationsEnabled = input.required<boolean>();
 	readonly evidenceUploadEnabled = input.required<boolean>();
 	readonly withdrawalPending = input(false);
@@ -36,9 +40,13 @@ export class LeaseEndNoticeCard {
 	readonly withdrawalOperationError = input('');
 	readonly invalidationOperationError = input('');
 	readonly evidenceOperationError = input('');
+	readonly withdrawalFieldErrors = input<FieldValidationError[]>([]);
+	readonly invalidationFieldErrors = input<FieldValidationError[]>([]);
 	readonly withdrawalRequested = output<NoticeAction<AcceptWithdrawalRequest>>();
 	readonly invalidationRequested = output<NoticeAction<InvalidateNoticeRequest>>();
 	readonly evidenceRequested = output<NoticeAction<AppendEvidenceRequest>>();
+	readonly withdrawalFieldChanged = output<string>();
+	readonly invalidationFieldChanged = output<string>();
 	readonly withdrawalModel = signal({ acceptedOn: '', reason: '' });
 	readonly invalidationModel = signal({ invalidatedOn: '', reason: '' });
 	readonly withdrawalForm = form(this.withdrawalModel, (fields) => {
@@ -49,12 +57,41 @@ export class LeaseEndNoticeCard {
 	});
 	readonly evidence = signal<File | null>(null);
 	readonly evidenceReason = signal('');
-	readonly withdrawalError = signal('');
-	readonly invalidationError = signal('');
 	readonly evidenceError = signal('');
+	readonly withdrawalSubmitted = signal(false);
+	readonly invalidationSubmitted = signal(false);
 
 	readonly civilDate = formatFrenchCivilDate;
 
+	constructor() {
+		effect(() => {
+			const withdrawalField = this.withdrawalFieldErrors()[0]?.field;
+			if (withdrawalField) {
+				queueMicrotask(() =>
+					(this.element.nativeElement as HTMLElement)
+						.querySelector<HTMLElement>(
+							withdrawalField === 'reason'
+								? '#withdrawal-reason'
+								: '#withdrawal-date',
+						)
+						?.focus(),
+				);
+			}
+			const invalidationField = this.invalidationFieldErrors()[0]?.field;
+			if (invalidationField) {
+				queueMicrotask(() =>
+					(this.element.nativeElement as HTMLElement)
+						.querySelector<HTMLElement>(
+							invalidationField === 'reason'
+								? '#invalidation-reason'
+								: '#invalidation-date',
+						)
+						?.focus(),
+				);
+			}
+		});
+	}
+
 	statusLabel(): string {
 		return {
 			ACTIVE: 'Congé en cours',
@@ -87,12 +124,12 @@ export class LeaseEndNoticeCard {
 
 	submitWithdrawal(): void {
 		if (this.withdrawalPending()) return;
+		this.withdrawalSubmitted.set(true);
+		this.withdrawalForm().markAsTouched();
 		const model = this.withdrawalModel();
-		if (!model.acceptedOn || !model.reason.trim()) {
-			this.withdrawalError.set('Renseignez la date et la raison du retrait accepté.');
+		if (this.withdrawalDateError() || this.withdrawalReasonError()) {
 			return;
 		}
-		this.withdrawalError.set('');
 		this.withdrawalRequested.emit({
 			noticeId: this.notice().id,
 			request: {
@@ -105,12 +142,12 @@ export class LeaseEndNoticeCard {
 
 	submitInvalidation(): void {
 		if (this.invalidationPending()) return;
+		this.invalidationSubmitted.set(true);
+		this.invalidationForm().markAsTouched();
 		const model = this.invalidationModel();
-		if (!model.invalidatedOn || !model.reason.trim()) {
-			this.invalidationError.set('Renseignez la date et la raison de l’invalidation.');
+		if (this.invalidationDateError() || this.invalidationReasonError()) {
 			return;
 		}
-		this.invalidationError.set('');
 		this.invalidationRequested.emit({
 			noticeId: this.notice().id,
 			request: {
@@ -129,6 +166,18 @@ export class LeaseEndNoticeCard {
 			this.evidenceError.set('Sélectionnez une preuve à conserver.');
 			return;
 		}
+		if (evidence.size === 0) {
+			this.evidenceError.set('La preuve sélectionnée est vide.');
+			return;
+		}
+		if (evidence.size > this.maxEvidenceBytes()) {
+			this.evidenceError.set('La preuve dépasse la taille maximale autorisée.');
+			return;
+		}
+		if (reason.length > 500) {
+			this.evidenceError.set('La raison ne peut pas dépasser 500 caractères.');
+			return;
+		}
 		if (this.notice().evidenceVersions.length > 0 && !reason) {
 			this.evidenceError.set('Indiquez la raison de cette nouvelle version de preuve.');
 			return;
@@ -139,4 +188,60 @@ export class LeaseEndNoticeCard {
 			request: { timeZone: this.timeZone(), evidence, ...(reason ? { reason } : {}) },
 		});
 	}
+
+	withdrawalDateError(): string {
+		const date = this.withdrawalModel().acceptedOn;
+		if (!this.show(this.withdrawalSubmitted(), this.withdrawalForm.acceptedOn())) return '';
+		if (!date) return 'Renseignez la date d’acceptation.';
+		return date < this.notice().receivedOn || date > this.today()
+			? 'La date doit être comprise entre la réception du congé et aujourd’hui.'
+			: '';
+	}
+
+	withdrawalReasonError(): string {
+		return this.reasonError(
+			this.withdrawalSubmitted(),
+			this.withdrawalForm.reason(),
+			this.withdrawalModel().reason,
+		);
+	}
+
+	invalidationDateError(): string {
+		const date = this.invalidationModel().invalidatedOn;
+		if (!this.show(this.invalidationSubmitted(), this.invalidationForm.invalidatedOn()))
+			return '';
+		if (!date) return 'Renseignez la date d’invalidation.';
+		return date < this.notice().receivedOn || date > this.today()
+			? 'La date doit être comprise entre la réception du congé et aujourd’hui.'
+			: '';
+	}
+
+	invalidationReasonError(): string {
+		return this.reasonError(
+			this.invalidationSubmitted(),
+			this.invalidationForm.reason(),
+			this.invalidationModel().reason,
+		);
+	}
+
+	serverError(errors: FieldValidationError[], field: string): string {
+		const code = errors.find((error) => error.field === field)?.code;
+		if (field === 'reason' && code === 'max_length')
+			return 'La raison ne peut pas dépasser 500 caractères.';
+		if (field === 'reason' && code === 'required') return 'Renseignez la raison.';
+		if ((field === 'acceptedOn' || field === 'invalidatedOn') && code) {
+			return 'La date doit être comprise entre la réception du congé et aujourd’hui.';
+		}
+		return '';
+	}
+
+	private reasonError(submitted: boolean, field: { touched(): boolean }, value: string): string {
+		if (!this.show(submitted, field)) return '';
+		if (!value.trim()) return 'Renseignez la raison.';
+		return value.trim().length > 500 ? 'La raison ne peut pas dépasser 500 caractères.' : '';
+	}
+
+	private show(submitted: boolean, field: { touched(): boolean }): boolean {
+		return submitted || field.touched();
+	}
 }

frontend/src/app/components/lease-end-notice-form/lease-end-notice-form.html

@@ -1,6 +1,6 @@
 <section class="notice-form" aria-labelledby="notice-form-title">
 	<h2 id="notice-form-title">Enregistrer un congé</h2>
-	<p>Les dates sont enregistrées comme des dates civiles dans le fuseau {{ timeZone() }}.</p>
+	<p>Les dates restent des dates civiles dans le fuseau {{ timeZone() }}.</p>
 	<form
 		[formRoot]="noticeForm"
 		[attr.aria-busy]="submitting()"
@@ -10,39 +10,109 @@
 			<div class="field-grid">
 				<label>
 					<span>Date de réception</span>
-					<input type="date" [formField]="noticeForm.receivedOn" />
+					<input
+						id="notice-received-on"
+						type="date"
+						[formField]="noticeForm.receivedOn"
+						(input)="fieldWasChanged('receivedOn')"
+					/>
+					@if (receivedOnError()) {
+						<p class="operation-error" role="alert">{{ receivedOnError() }}</p>
+					}
+					@if (serverError('receivedOn')) {
+						<p class="operation-error" role="alert">{{ serverError('receivedOn') }}</p>
+					}
 				</label>
 				<label>
 					<span>Départ demandé</span>
-					<input type="date" [formField]="noticeForm.requestedDepartureOn" />
+					<input
+						id="notice-requested-departure-on"
+						type="date"
+						[formField]="noticeForm.requestedDepartureOn"
+						(input)="fieldWasChanged('requestedDepartureOn')"
+					/>
+					@if (requestedDepartureOnError()) {
+						<p class="operation-error" role="alert">
+							{{ requestedDepartureOnError() }}
+						</p>
+					}
+					@if (serverError('requestedDepartureOn')) {
+						<p class="operation-error" role="alert">
+							{{ serverError('requestedDepartureOn') }}
+						</p>
+					}
 				</label>
 			</div>
 			<label>
 				<span>Mode de remise</span>
-				<select [formField]="noticeForm.deliveryMode">
+				<select
+					id="notice-delivery-mode"
+					[formField]="noticeForm.deliveryMode"
+					(change)="fieldWasChanged('deliveryMode')"
+				>
 					<option value="">Choisissez un mode</option>
 					@for (mode of deliveryModes; track mode.value) {
 						<option [value]="mode.value">{{ mode.label }}</option>
 					}
 				</select>
+				@if (deliveryModeError()) {
+					<p class="operation-error" role="alert">{{ deliveryModeError() }}</p>
+				}
 			</label>
 			@if (model().deliveryMode === 'OTHER') {
 				<label>
 					<span>Mode de remise utilisé</span>
-					<input type="text" [formField]="noticeForm.otherDeliveryMode" />
+					<input
+						id="notice-other-delivery-mode"
+						type="text"
+						[formField]="noticeForm.otherDeliveryMode"
+						(input)="fieldWasChanged('otherDeliveryMode')"
+					/>
+					@if (otherDeliveryModeError()) {
+						<p class="operation-error" role="alert">{{ otherDeliveryModeError() }}</p>
+					}
+					@if (serverError('otherDeliveryMode')) {
+						<p class="operation-error" role="alert">
+							{{ serverError('otherDeliveryMode') }}
+						</p>
+					}
 				</label>
 				<label class="confirmation-field">
-					<input type="checkbox" [formField]="noticeForm.nonStandardDeliveryConfirmed" />
+					<input
+						type="checkbox"
+						[formField]="noticeForm.nonStandardDeliveryConfirmed"
+						(change)="fieldWasChanged('nonStandardDeliveryConfirmed')"
+					/>
 					<span>Je confirme avoir vérifié ce mode de remise non standard.</span>
 				</label>
+				@if (nonStandardDeliveryError()) {
+					<p class="operation-error" role="alert">{{ nonStandardDeliveryError() }}</p>
+				}
+				@if (serverError('nonStandardDeliveryConfirmed')) {
+					<p class="operation-error" role="alert">
+						{{ serverError('nonStandardDeliveryConfirmed') }}
+					</p>
+				}
 			}
 			@if (lateRegistration()) {
 				<label class="confirmation-field">
-					<input type="checkbox" [formField]="noticeForm.lateRegistrationConfirmed" />
+					<input
+						type="checkbox"
+						[formField]="noticeForm.lateRegistrationConfirmed"
+						(change)="fieldWasChanged('lateRegistrationConfirmed')"
+					/>
 					<span
 						>Je confirme enregistrer aujourd’hui un congé reçu à une date passée.</span
 					>
 				</label>
+				@if (lateRegistrationError()) {
+					<p class="operation-error" role="alert">{{ lateRegistrationError() }}</p>
+				}
+				@if (serverError('lateRegistrationConfirmed')) {
+					<p class="operation-error" role="alert">
+						{{ serverError('lateRegistrationConfirmed') }}
+					</p>
+				}
 			}
 			<label>
 				<span>Preuve (facultative, tout format)</span>
@@ -53,14 +123,23 @@
 				<div class="missing-evidence-warning">
 					<p>Aucun justificatif ne sera associé à ce congé lors de son enregistrement.</p>
 					<label class="confirmation-field">
-						<input type="checkbox" [formField]="noticeForm.missingEvidenceConfirmed" />
+						<input
+							type="checkbox"
+							[formField]="noticeForm.missingEvidenceConfirmed"
+							(change)="fieldWasChanged('missingEvidenceConfirmed')"
+						/>
 						<span>Je confirme enregistrer ce congé sans justificatif.</span>
 					</label>
+					@if (serverError('missingEvidenceConfirmed')) {
+						<p class="operation-error" role="alert">
+							{{ serverError('missingEvidenceConfirmed') }}
+						</p>
+					}
 				</div>
 			}
-			@if (validationError() || operationError()) {
+			@if (evidenceError() || operationError()) {
 				<p class="operation-error" role="alert">
-					{{ validationError() || operationError() }}
+					{{ evidenceError() || operationError() }}
 				</p>
 			}
 			<button mat-flat-button type="submit" [disabled]="submitting()">

frontend/src/app/components/lease-end-notice-form/lease-end-notice-form.spec.ts

@@ -9,6 +9,7 @@ describe('LeaseEndNoticeForm', () => {
 		const fixture = TestBed.createComponent(LeaseEndNoticeForm);
 		fixture.componentRef.setInput('timeZone', 'Europe/Paris');
 		fixture.componentRef.setInput('today', '2026-07-19');
+		fixture.componentRef.setInput('maxEvidenceBytes', 1024);
 		fixture.componentRef.setInput('submitting', false);
 		fixture.detectChanges();
 		fixture.componentInstance.model.set({
@@ -25,22 +26,48 @@ describe('LeaseEndNoticeForm', () => {
 		expect(fixture.nativeElement.querySelector('input[type="text"]').maxLength).toBe(200);
 
 		fixture.componentInstance.submit();
-		expect(fixture.componentInstance.validationError()).toContain('enregistrement tardif');
+		expect(fixture.componentInstance.lateRegistrationError()).toContain(
+			'enregistrement tardif',
+		);
 
 		fixture.componentInstance.model.update((model) => ({
 			...model,
 			lateRegistrationConfirmed: true,
 		}));
 		fixture.componentInstance.submit();
-		expect(fixture.componentInstance.validationError()).toContain(
+		expect(fixture.componentInstance.nonStandardDeliveryError()).toContain(
 			'mode de remise non standard',
 		);
 	});
 
+	it('shows the requested departure guidance after submit', () => {
+		const fixture = TestBed.createComponent(LeaseEndNoticeForm);
+		fixture.componentRef.setInput('timeZone', 'Europe/Paris');
+		fixture.componentRef.setInput('today', '2026-07-19');
+		fixture.componentRef.setInput('maxEvidenceBytes', 1024);
+		fixture.componentRef.setInput('submitting', false);
+		fixture.componentInstance.model.set({
+			receivedOn: '2026-07-19',
+			requestedDepartureOn: '2026-07-18',
+			deliveryMode: 'HAND_DELIVERY',
+			otherDeliveryMode: '',
+			lateRegistrationConfirmed: false,
+			nonStandardDeliveryConfirmed: false,
+			missingEvidenceConfirmed: true,
+		});
+
+		fixture.componentInstance.submit();
+
+		expect(fixture.componentInstance.requestedDepartureOnError()).toContain(
+			'ne peut pas précéder',
+		);
+	});
+
 	it('emits civil dates, timezone and arbitrary evidence without converting the day', () => {
 		const fixture = TestBed.createComponent(LeaseEndNoticeForm);
 		fixture.componentRef.setInput('timeZone', 'America/Los_Angeles');
 		fixture.componentRef.setInput('today', '2026-07-19');
+		fixture.componentRef.setInput('maxEvidenceBytes', 1024);
 		fixture.componentRef.setInput('submitting', false);
 		const requested = vi.fn();
 		fixture.componentInstance.noticeRequested.subscribe(requested);
@@ -86,6 +113,7 @@ describe('LeaseEndNoticeForm', () => {
 		const fixture = TestBed.createComponent(LeaseEndNoticeForm);
 		fixture.componentRef.setInput('timeZone', 'Europe/Paris');
 		fixture.componentRef.setInput('today', '2026-07-19');
+		fixture.componentRef.setInput('maxEvidenceBytes', 1024);
 		fixture.componentRef.setInput('submitting', false);
 		const requested = vi.fn();
 		fixture.componentInstance.noticeRequested.subscribe(requested);
@@ -101,7 +129,7 @@ describe('LeaseEndNoticeForm', () => {
 		});
 
 		fixture.componentInstance.submit();
-		expect(fixture.componentInstance.validationError()).toContain('sans justificatif');
+		expect(fixture.componentInstance.evidenceError()).toContain('sans justificatif');
 
 		fixture.componentInstance.model.update((model) => ({
 			...model,

frontend/src/app/components/lease-end-notice-form/lease-end-notice-form.ts

@@ -1,8 +1,37 @@
-import { Component, computed, input, output, signal } from '@angular/core';
+import {
+	Component,
+	computed,
+	effect,
+	ElementRef,
+	inject,
+	input,
+	output,
+	signal,
+} from '@angular/core';
 import { FormsModule } from '@angular/forms';
-import { FormField, FormRoot, form, maxLength } from '@angular/forms/signals';
+import { FormField, FormRoot, form, maxLength, required } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { NoticeDeliveryMode, RecordNoticeRequest } from '../../services/lease-end.service';
+import { FieldValidationError } from '../../services/http-error-message';
+
+const serverMessages: Record<string, Record<string, string>> = {
+	receivedOn: { not_future: 'La date de réception ne peut pas être future.' },
+	requestedDepartureOn: {
+		after_or_equal_received_on:
+			'La date de départ demandée ne peut pas précéder la réception du congé.',
+	},
+	otherDeliveryMode: {
+		required: 'Décrivez le mode de remise utilisé.',
+		max_length: 'Le mode de remise ne peut pas dépasser 200 caractères.',
+	},
+	lateRegistrationConfirmed: {
+		required: 'Confirmez cet enregistrement tardif avant de continuer.',
+	},
+	nonStandardDeliveryConfirmed: {
+		required: 'Confirmez le mode de remise non standard avant de continuer.',
+	},
+	missingEvidenceConfirmed: { required: 'Confirmez l’enregistrement sans justificatif.' },
+};
 
 @Component({
 	selector: 'app-lease-end-notice-form',
@@ -11,11 +40,15 @@ import { NoticeDeliveryMode, RecordNoticeRequest } from '../../services/lease-en
 	styleUrl: './lease-end-notice-form.css',
 })
 export class LeaseEndNoticeForm {
+	private readonly element = inject(ElementRef<HTMLElement>);
 	readonly timeZone = input.required<string>();
 	readonly today = input.required<string>();
+	readonly maxEvidenceBytes = input.required<number>();
 	readonly submitting = input.required<boolean>();
 	readonly operationError = input('');
+	readonly fieldErrors = input<FieldValidationError[]>([]);
 	readonly noticeRequested = output<RecordNoticeRequest>();
+	readonly fieldChanged = output<string>();
 	readonly model = signal({
 		receivedOn: '',
 		requestedDepartureOn: '',
@@ -26,10 +59,13 @@ export class LeaseEndNoticeForm {
 		missingEvidenceConfirmed: false,
 	});
 	readonly noticeForm = form(this.model, (fields) => {
+		required(fields.receivedOn);
+		required(fields.requestedDepartureOn);
+		required(fields.deliveryMode);
 		maxLength(fields.otherDeliveryMode, 200);
 	});
 	readonly evidence = signal<File | null>(null);
-	readonly validationError = signal('');
+	readonly submitted = signal(false);
 	readonly lateRegistration = computed(
 		() => this.model().receivedOn !== '' && this.model().receivedOn < this.today(),
 	);
@@ -40,6 +76,12 @@ export class LeaseEndNoticeForm {
 		{ value: 'OTHER', label: 'Autre mode' },
 	] as const satisfies readonly { value: NoticeDeliveryMode; label: string }[];
 
+	constructor() {
+		effect(() => {
+			if (this.fieldErrors().length) queueMicrotask(() => this.focusFirstInvalid());
+		});
+	}
+
 	selectEvidence(event: Event): void {
 		const input = event.target;
 		const evidence = input instanceof HTMLInputElement ? (input.files?.item(0) ?? null) : null;
@@ -50,47 +92,127 @@ export class LeaseEndNoticeForm {
 		if (input instanceof HTMLInputElement) input.value = '';
 	}
 
+	receivedOnError(): string {
+		if (!this.show(this.noticeForm.receivedOn())) return '';
+		if (!this.model().receivedOn) return 'Renseignez la date de réception du congé.';
+		return this.model().receivedOn > this.today()
+			? 'La date de réception ne peut pas être future.'
+			: '';
+	}
+
+	requestedDepartureOnError(): string {
+		if (!this.show(this.noticeForm.requestedDepartureOn())) return '';
+		if (!this.model().requestedDepartureOn) return 'Renseignez la date de départ demandée.';
+		return this.model().receivedOn &&
+			this.model().requestedDepartureOn < this.model().receivedOn
+			? 'La date de départ demandée ne peut pas précéder la réception du congé.'
+			: '';
+	}
+
+	deliveryModeError(): string {
+		return this.show(this.noticeForm.deliveryMode()) && !this.model().deliveryMode
+			? 'Choisissez le mode de remise du congé.'
+			: '';
+	}
+
+	otherDeliveryModeError(): string {
+		if (
+			this.model().deliveryMode !== 'OTHER' ||
+			!this.show(this.noticeForm.otherDeliveryMode())
+		) {
+			return '';
+		}
+		return !this.model().otherDeliveryMode.trim()
+			? 'Décrivez le mode de remise utilisé.'
+			: this.model().otherDeliveryMode.trim().length > 200
+				? 'Le mode de remise ne peut pas dépasser 200 caractères.'
+				: '';
+	}
+
+	lateRegistrationError(): string {
+		return this.lateRegistration() &&
+			this.show(this.noticeForm.lateRegistrationConfirmed()) &&
+			!this.model().lateRegistrationConfirmed
+			? 'Confirmez cet enregistrement tardif avant de continuer.'
+			: '';
+	}
+
+	nonStandardDeliveryError(): string {
+		return this.model().deliveryMode === 'OTHER' &&
+			this.show(this.noticeForm.nonStandardDeliveryConfirmed()) &&
+			!this.model().nonStandardDeliveryConfirmed
+			? 'Confirmez le mode de remise non standard avant de continuer.'
+			: '';
+	}
+
+	evidenceError(): string {
+		const evidence = this.evidence();
+		if (evidence?.size === 0) return 'La preuve sélectionnée est vide.';
+		if (evidence && evidence.size > this.maxEvidenceBytes()) {
+			return 'La preuve dépasse la taille maximale autorisée.';
+		}
+		return !evidence && this.submitted() && !this.model().missingEvidenceConfirmed
+			? 'Confirmez l’enregistrement de ce congé sans justificatif avant de continuer.'
+			: '';
+	}
+
+	serverError(field: string): string {
+		const code = this.fieldErrors().find((error) => error.field === field)?.code;
+		return serverMessages[field]?.[code ?? ''] ?? '';
+	}
+
+	fieldWasChanged(field: string): void {
+		this.fieldChanged.emit(field);
+	}
+
 	submit(): void {
 		if (this.submitting()) return;
+		this.submitted.set(true);
+		this.noticeForm().markAsTouched();
 		const model = this.model();
-		if (!model.receivedOn || !model.requestedDepartureOn || !model.deliveryMode) {
-			this.validationError.set('Renseignez les deux dates et le mode de remise du congé.');
+		if (
+			this.receivedOnError() ||
+			this.requestedDepartureOnError() ||
+			this.deliveryModeError() ||
+			this.otherDeliveryModeError() ||
+			this.lateRegistrationError() ||
+			this.nonStandardDeliveryError() ||
+			this.evidenceError()
+		) {
 			return;
 		}
-		if (this.lateRegistration() && !model.lateRegistrationConfirmed) {
-			this.validationError.set('Confirmez cet enregistrement tardif avant de continuer.');
-			return;
-		}
-		if (model.deliveryMode === 'OTHER' && !model.otherDeliveryMode.trim()) {
-			this.validationError.set('Décrivez le mode de remise utilisé.');
-			return;
-		}
-		if (model.deliveryMode === 'OTHER' && !model.nonStandardDeliveryConfirmed) {
-			this.validationError.set(
-				'Confirmez le mode de remise non standard avant de continuer.',
-			);
-			return;
-		}
-		if (!this.evidence() && !model.missingEvidenceConfirmed) {
-			this.validationError.set(
-				'Confirmez l’enregistrement de ce congé sans justificatif avant de continuer.',
-			);
-			return;
-		}
-		this.validationError.set('');
+		const deliveryMode = model.deliveryMode;
+		if (!deliveryMode) return;
 		const evidence = this.evidence();
 		this.noticeRequested.emit({
 			timeZone: this.timeZone(),
 			receivedOn: model.receivedOn,
 			requestedDepartureOn: model.requestedDepartureOn,
-			deliveryMode: model.deliveryMode,
-			...(model.deliveryMode === 'OTHER'
+			deliveryMode,
+			...(deliveryMode === 'OTHER'
 				? { otherDeliveryMode: model.otherDeliveryMode.trim() }
 				: {}),
 			lateRegistrationConfirmed: this.lateRegistration(),
-			nonStandardDeliveryConfirmed: model.deliveryMode === 'OTHER',
+			nonStandardDeliveryConfirmed: deliveryMode === 'OTHER',
 			missingEvidenceConfirmed: evidence === null,
 			...(evidence ? { evidence } : {}),
 		});
 	}
+
+	private show(field: { touched(): boolean }): boolean {
+		return this.submitted() || field.touched();
+	}
+
+	private focusFirstInvalid(): void {
+		const field = this.fieldErrors()[0]?.field;
+		const selector =
+			field === 'receivedOn'
+				? '#notice-received-on'
+				: field === 'requestedDepartureOn'
+					? '#notice-requested-departure-on'
+					: field === 'otherDeliveryMode'
+						? '#notice-other-delivery-mode'
+						: '#notice-delivery-mode';
+		(this.element.nativeElement as HTMLElement).querySelector<HTMLElement>(selector)?.focus();
+	}
 }

frontend/src/app/components/lease-end-page/lease-end-page.html

@@ -116,6 +116,8 @@
 						[leaseId]="leaseId"
 						[notice]="notice"
 						[timeZone]="timeZone"
+						[today]="today"
+						[maxEvidenceBytes]="endState.maxEvidenceBytes"
 						[lifecycleMutationsEnabled]="lifecycleMutationsEnabled()"
 						[evidenceUploadEnabled]="true"
 						[withdrawalPending]="operationPending('withdrawal:' + notice.id)"
@@ -124,9 +126,17 @@
 						[withdrawalOperationError]="operationError('withdrawal:' + notice.id)"
 						[invalidationOperationError]="operationError('invalidation:' + notice.id)"
 						[evidenceOperationError]="operationError('evidence:' + notice.id)"
+						[withdrawalFieldErrors]="operationFieldError('withdrawal:' + notice.id)"
+						[invalidationFieldErrors]="operationFieldError('invalidation:' + notice.id)"
 						(withdrawalRequested)="requestWithdrawal($event)"
 						(invalidationRequested)="requestInvalidation($event)"
 						(evidenceRequested)="appendEvidence($event)"
+						(withdrawalFieldChanged)="
+							clearOperationFieldError('withdrawal:' + notice.id, $event)
+						"
+						(invalidationFieldChanged)="
+							clearOperationFieldError('invalidation:' + notice.id, $event)
+						"
 					/>
 				}
 			</section>
@@ -136,14 +146,19 @@
 			<app-lease-end-notice-form
 				[timeZone]="timeZone"
 				[today]="today"
+				[maxEvidenceBytes]="endState.maxEvidenceBytes"
 				[submitting]="operationPending('notice')"
 				[operationError]="operationError('notice')"
+				[fieldErrors]="operationFieldError('notice')"
 				(noticeRequested)="recordNotice($event)"
+				(fieldChanged)="clearOperationFieldError('notice', $event)"
 			/>
 		}
 		@if (canRecordAgreement() || canClose()) {
 			<app-lease-end-resolution-forms
 				[timeZone]="timeZone"
+				[leaseStartOn]="endState.leaseStartOn"
+				[currentEndOn]="endState.effectiveEndOn"
 				[showAgreement]="canRecordAgreement()"
 				[showClosure]="canClose()"
 				[keysReturnedOn]="exitReportDate()"
@@ -152,8 +167,12 @@
 				[closurePending]="operationPending('closure')"
 				[agreementOperationError]="operationError('agreement')"
 				[closureOperationError]="operationError('closure')"
+				[agreementFieldErrors]="operationFieldError('agreement')"
+				[closureFieldErrors]="operationFieldError('closure')"
 				(agreedEndRequested)="recordAgreement($event)"
 				(closureRequested)="closeLease($event)"
+				(agreementFieldChanged)="clearOperationFieldError('agreement', $event)"
+				(closureFieldChanged)="clearOperationFieldError('closure', $event)"
 			/>
 		}
 	}

frontend/src/app/components/lease-end-page/lease-end-page.spec.ts

@@ -17,8 +17,10 @@ describe('LeaseEndPage', () => {
 		unsupportedReason: null,
 		phase: 'NOTICE_PERIOD',
 		leaseType: 'STUDENT',
+		leaseStartOn: '2026-01-01',
 		fixedEndOn: '2026-07-31',
 		effectiveEndOn: '2026-07-31',
+		maxEvidenceBytes: 1024,
 		correctionRequired: false,
 		agreedEarlyEnds: [],
 		agreedEarlyEnd: null,
@@ -230,6 +232,36 @@ describe('LeaseEndPage', () => {
 		expect(fixture.componentInstance.state()?.phase).toBe('ACTIVE');
 	});
 
+	it('clears only the edited structured field error and its generic message', () => {
+		getState.mockReturnValueOnce(of({ ...state, phase: 'ACTIVE', notices: [] }));
+		recordNotice.mockReturnValue(
+			throwError(() => ({
+				status: 400,
+				error: {
+					code: 'validation_failed',
+					errors: [{ field: 'receivedOn', code: 'not_future' }],
+				},
+			})),
+		);
+		const fixture = TestBed.createComponent(LeaseEndPage);
+		fixture.detectChanges();
+
+		fixture.componentInstance.recordNotice({
+			timeZone: 'Europe/Paris',
+			receivedOn: '2026-07-20',
+			requestedDepartureOn: '2026-08-20',
+			deliveryMode: 'HAND_DELIVERY',
+			lateRegistrationConfirmed: false,
+			nonStandardDeliveryConfirmed: false,
+			missingEvidenceConfirmed: true,
+		});
+
+		expect(fixture.componentInstance.operationFieldError('notice')).toHaveLength(1);
+		fixture.componentInstance.clearOperationFieldError('notice', 'receivedOn');
+		expect(fixture.componentInstance.operationFieldError('notice')).toEqual([]);
+		expect(fixture.componentInstance.operationError('notice')).toBe('');
+	});
+
 	it('confirms a reasoned withdrawal before calling its dedicated endpoint', () => {
 		acceptWithdrawal.mockReturnValue(of({ ...state, phase: 'ACTIVE' }));
 		const fixture = TestBed.createComponent(LeaseEndPage);

frontend/src/app/components/lease-end-page/lease-end-page.ts

@@ -10,7 +10,7 @@ import {
 	formatFrenchCivilMonth,
 	todayInTimeZone,
 } from '../../services/civil-date';
-import { httpErrorMessage } from '../../services/http-error-message';
+import { FieldValidationError, saveFailure } from '../../services/http-error-message';
 import { withoutRecordKey } from '../../services/immutable-state';
 import {
 	AgreedEarlyEndRequest,
@@ -58,6 +58,7 @@ export class LeaseEndPage {
 	readonly pendingOperations = signal<ReadonlySet<string>>(new Set());
 	readonly confirmingOperations = signal<ReadonlySet<string>>(new Set());
 	readonly operationErrors = signal<Record<string, string>>({});
+	readonly operationFieldErrors = signal<Record<string, FieldValidationError[]>>({});
 	readonly lifecycleMutationsEnabled = computed(() => {
 		const state = this.state();
 		return !!state?.supported && state.phase !== 'ARCHIVED' && !state.closure;
@@ -110,7 +111,7 @@ export class LeaseEndPage {
 				next: (state) => this.state.set(state),
 				error: (error: unknown) =>
 					this.loadError.set(
-						httpErrorMessage(error, 'Impossible de charger la fin de ce bail.'),
+						saveFailure(error, 'Impossible de charger la fin de ce bail.').message,
 					),
 			});
 	}
@@ -201,6 +202,22 @@ export class LeaseEndPage {
 		return this.operationErrors()[key] ?? '';
 	}
 
+	operationFieldError(key: string): FieldValidationError[] {
+		return this.operationFieldErrors()[key] ?? [];
+	}
+
+	clearOperationFieldError(key: string, field: string): void {
+		const errors = this.operationFieldError(key);
+		if (!errors.some((error) => error.field === field)) return;
+		const remaining = errors.filter((error) => error.field !== field);
+		this.operationFieldErrors.update((all) =>
+			remaining.length ? { ...all, [key]: remaining } : withoutRecordKey(all, key),
+		);
+		if (!remaining.length) {
+			this.operationErrors.update((all) => withoutRecordKey(all, key));
+		}
+	}
+
 	private confirm(key: string, data: ConfirmationDialogData, action: () => void): void {
 		if (this.operationPending(key)) return;
 		this.confirmingOperations.update((keys) => new Set(keys).add(key));
@@ -223,6 +240,7 @@ export class LeaseEndPage {
 		if (this.pendingOperations().has(key)) return;
 		this.pendingOperations.update((keys) => new Set(keys).add(key));
 		this.operationErrors.update((errors) => withoutRecordKey(errors, key));
+		this.operationFieldErrors.update((errors) => withoutRecordKey(errors, key));
 		request
 			.pipe(
 				takeUntilDestroyed(this.destroyRef),
@@ -230,11 +248,17 @@ export class LeaseEndPage {
 			)
 			.subscribe({
 				next: (state) => this.state.set(state),
-				error: (error: unknown) =>
+				error: (error: unknown) => {
+					const failure = saveFailure(error, fallback);
 					this.operationErrors.update((errors) => ({
 						...errors,
-						[key]: httpErrorMessage(error, fallback),
-					})),
+						[key]: failure.message,
+					}));
+					this.operationFieldErrors.update((errors) => ({
+						...errors,
+						[key]: failure.fieldErrors,
+					}));
+				},
 			});
 	}
 }

frontend/src/app/components/lease-end-resolution-forms/lease-end-resolution-forms.html

@@ -10,15 +10,41 @@
 				<fieldset [disabled]="agreementPending()">
 					<label>
 						<span>Date de fin convenue</span>
-						<input type="date" [formField]="agreementForm.endOn" />
+						<input
+							id="agreement-end-on"
+							type="date"
+							[formField]="agreementForm.endOn"
+							(input)="agreementFieldChanged.emit('endOn')"
+						/>
 					</label>
+					@if (agreementDateError()) {
+						<p class="operation-error" role="alert">{{ agreementDateError() }}</p>
+					}
+					@if (serverError(agreementFieldErrors(), 'endOn')) {
+						<p class="operation-error" role="alert">
+							{{ serverError(agreementFieldErrors(), 'endOn') }}
+						</p>
+					}
 					<label>
 						<span>Raison de l’accord</span>
-						<textarea rows="3" [formField]="agreementForm.reason"></textarea>
+						<textarea
+							id="agreement-reason"
+							rows="3"
+							[formField]="agreementForm.reason"
+							(input)="agreementFieldChanged.emit('reason')"
+						></textarea>
 					</label>
-					@if (agreementError() || agreementOperationError()) {
+					@if (agreementReasonError()) {
+						<p class="operation-error" role="alert">{{ agreementReasonError() }}</p>
+					}
+					@if (serverError(agreementFieldErrors(), 'reason')) {
 						<p class="operation-error" role="alert">
-							{{ agreementError() || agreementOperationError() }}
+							{{ serverError(agreementFieldErrors(), 'reason') }}
+						</p>
+					}
+					@if (agreementOperationError()) {
+						<p class="operation-error" role="alert">
+							{{ agreementOperationError() }}
 						</p>
 					}
 					<button mat-stroked-button type="submit" [disabled]="agreementPending()">
@@ -47,12 +73,22 @@
 						}}</strong>
 					</p>
 					<label class="confirmation-field">
-						<input type="checkbox" [formField]="closureForm.confirmed" />
+						<input
+							id="closure-confirmed"
+							type="checkbox"
+							[formField]="closureForm.confirmed"
+							(change)="closureFieldChanged.emit('confirmed')"
+						/>
 						<span
 							>Je confirme que les clés ont réellement été restituées à cette
 							date.</span
 						>
 					</label>
+					@if (serverError(closureFieldErrors(), 'confirmed')) {
+						<p class="operation-error" role="alert">
+							{{ serverError(closureFieldErrors(), 'confirmed') }}
+						</p>
+					}
 					@if (closureError() || closureOperationError()) {
 						<p class="operation-error" role="alert">
 							{{ closureError() || closureOperationError() }}

frontend/src/app/components/lease-end-resolution-forms/lease-end-resolution-forms.spec.ts

@@ -6,6 +6,7 @@ describe('LeaseEndResolutionForms', () => {
 	function createFixture() {
 		const fixture = TestBed.createComponent(LeaseEndResolutionForms);
 		fixture.componentRef.setInput('timeZone', 'America/Los_Angeles');
+		fixture.componentRef.setInput('leaseStartOn', '2026-01-01');
 		fixture.componentRef.setInput('agreementPending', false);
 		fixture.componentRef.setInput('closurePending', false);
 		fixture.detectChanges();

frontend/src/app/components/lease-end-resolution-forms/lease-end-resolution-forms.ts

@@ -1,8 +1,9 @@
-import { Component, input, output, signal } from '@angular/core';
+import { Component, effect, ElementRef, inject, input, output, signal } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { FormField, FormRoot, form, maxLength } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { AgreedEarlyEndRequest, CloseLeaseRequest } from '../../services/lease-end.service';
+import { FieldValidationError } from '../../services/http-error-message';
 
 @Component({
 	selector: 'app-lease-end-resolution-forms',
@@ -11,34 +12,64 @@ import { AgreedEarlyEndRequest, CloseLeaseRequest } from '../../services/lease-e
 	styleUrl: './lease-end-resolution-forms.css',
 })
 export class LeaseEndResolutionForms {
+	private readonly element = inject(ElementRef<HTMLElement>);
 	readonly timeZone = input.required<string>();
+	readonly leaseStartOn = input.required<string>();
+	readonly currentEndOn = input<string | null>(null);
 	readonly agreementPending = input(false);
 	readonly closurePending = input(false);
 	readonly agreementOperationError = input('');
 	readonly closureOperationError = input('');
+	readonly agreementFieldErrors = input<FieldValidationError[]>([]);
+	readonly closureFieldErrors = input<FieldValidationError[]>([]);
 	readonly showAgreement = input(true);
 	readonly showClosure = input(true);
 	readonly keysReturnedOn = input<string | null>(null);
 	readonly closureEnabled = input(false);
 	readonly agreedEndRequested = output<AgreedEarlyEndRequest>();
 	readonly closureRequested = output<CloseLeaseRequest>();
+	readonly agreementFieldChanged = output<string>();
+	readonly closureFieldChanged = output<string>();
 	readonly agreementModel = signal({ endOn: '', reason: '' });
 	readonly closureModel = signal({ confirmed: false });
 	readonly agreementForm = form(this.agreementModel, (fields) => {
 		maxLength(fields.reason, 500);
 	});
 	readonly closureForm = form(this.closureModel);
-	readonly agreementError = signal('');
 	readonly closureError = signal('');
+	readonly agreementSubmitted = signal(false);
+
+	constructor() {
+		effect(() => {
+			const agreementField = this.agreementFieldErrors()[0]?.field;
+			if (agreementField) {
+				queueMicrotask(() =>
+					(this.element.nativeElement as HTMLElement)
+						.querySelector<HTMLElement>(
+							agreementField === 'reason' ? '#agreement-reason' : '#agreement-end-on',
+						)
+						?.focus(),
+				);
+			}
+			const closureField = this.closureFieldErrors()[0]?.field;
+			if (closureField) {
+				queueMicrotask(() =>
+					(this.element.nativeElement as HTMLElement)
+						.querySelector<HTMLElement>('#closure-confirmed')
+						?.focus(),
+				);
+			}
+		});
+	}
 
 	submitAgreement(): void {
 		if (this.agreementPending()) return;
+		this.agreementSubmitted.set(true);
+		this.agreementForm().markAsTouched();
 		const model = this.agreementModel();
-		if (!model.endOn || !model.reason.trim()) {
-			this.agreementError.set('Renseignez la date et la raison de la fin anticipée.');
+		if (this.agreementDateError() || this.agreementReasonError()) {
 			return;
 		}
-		this.agreementError.set('');
 		this.agreedEndRequested.emit({
 			timeZone: this.timeZone(),
 			endOn: model.endOn,
@@ -46,6 +77,40 @@ export class LeaseEndResolutionForms {
 		});
 	}
 
+	agreementDateError(): string {
+		if (!this.show(this.agreementForm.endOn())) return '';
+		const endOn = this.agreementModel().endOn;
+		if (!endOn) return 'Renseignez la date de fin convenue.';
+		if (endOn < this.leaseStartOn()) {
+			return 'La fin convenue ne peut pas précéder le début du bail.';
+		}
+		const currentEndOn = this.currentEndOn();
+		return currentEndOn && endOn >= currentEndOn
+			? 'La fin convenue doit être antérieure à la fin actuelle du bail.'
+			: '';
+	}
+
+	agreementReasonError(): string {
+		if (!this.show(this.agreementForm.reason())) return '';
+		const reason = this.agreementModel().reason.trim();
+		if (!reason) return 'Renseignez la raison de la fin anticipée.';
+		return reason.length > 500 ? 'La raison ne peut pas dépasser 500 caractères.' : '';
+	}
+
+	serverError(errors: FieldValidationError[], field: string): string {
+		const code = errors.find((error) => error.field === field)?.code;
+		if (field === 'endOn' && code === 'after_or_equal_lease_start') {
+			return 'La fin convenue ne peut pas précéder le début du bail.';
+		}
+		if (field === 'endOn' && code === 'before_current_end') {
+			return 'La fin convenue doit être antérieure à la fin actuelle du bail.';
+		}
+		if (field === 'reason' && code === 'max_length')
+			return 'La raison ne peut pas dépasser 500 caractères.';
+		if (field === 'confirmed' && code) return 'Confirmez la restitution réelle des clés.';
+		return '';
+	}
+
 	submitClosure(): void {
 		if (this.closurePending()) return;
 		const model = this.closureModel();
@@ -65,4 +130,8 @@ export class LeaseEndResolutionForms {
 			confirmed: true,
 		});
 	}
+
+	private show(field: { touched(): boolean }): boolean {
+		return this.agreementSubmitted() || field.touched();
+	}
 }

frontend/src/app/services/lease-end.service.ts

@@ -48,8 +48,10 @@ export interface LeaseEndState {
 	unsupportedReason: string | null;
 	phase: LeaseEndPhase;
 	leaseType: 'STANDARD' | 'STUDENT';
+	leaseStartOn: string;
 	fixedEndOn: string | null;
 	effectiveEndOn: string | null;
+	maxEvidenceBytes: number;
 	correctionRequired: boolean;
 	exitConditionReport: {
 		occurredOn: string;