import { HttpClient } from '@angular/common/http';
import { Injectable, inject } from '@angular/core';
import { Observable } from 'rxjs';

export type RentPaymentStatus = 'CONFIRMED' | 'REVERSED';

export interface PaymentAllocation {
  id: string;
  rentDueId: string;
  amount: number;
  allocatedAt: string;
}

export interface RentPaymentRefund {
  id: string;
  amount: number;
  refundedAt: string;
  version: number;
}

export interface RentPaymentReversal {
  id: string;
  reversedAt: string;
  reason: string;
  reversedAllocations: PaymentAllocation[];
}

export interface RentPayment {
  id: string;
  leaseId: string;
  receivedAt: string;
  amount: number;
  status: RentPaymentStatus;
  allocations: PaymentAllocation[];
  allocatedAmount: number;
  refundedAmount: number;
  unallocatedBalance: number;
  confirmedAt: string;
  version: number;
  refunds: RentPaymentRefund[];
  reversal: RentPaymentReversal | null;
}

export interface RecordRentPaymentRequest {
  operationId: string;
  rentDueId: string;
  rentDueVersion: number;
  receivedAt: string;
  amount: number;
  timeZone: string;
}

export interface AllocateRentPaymentRequest {
  operationId: string;
  paymentVersion: number;
  rentDueId: string;
  rentDueVersion: number;
  amount: number;
}

export interface RefundRentPaymentRequest {
  operationId: string;
  paymentVersion: number;
  amount: number;
  refundedAt: string;
  timeZone: string;
}

@Injectable({ providedIn: 'root' })
export class RentPaymentService {
  private readonly http = inject(HttpClient);

  getRentPayments(): Observable<RentPayment[]> {
    return this.http.get<RentPayment[]>('/api/rent-payments');
  }

  record(request: RecordRentPaymentRequest): Observable<RentPayment> {
    return this.http.post<RentPayment>('/api/rent-payments', request);
  }

  allocate(paymentId: string, request: AllocateRentPaymentRequest): Observable<RentPayment> {
    return this.http.post<RentPayment>(`/api/rent-payments/${paymentId}/allocations`, request);
  }

  refund(paymentId: string, request: RefundRentPaymentRequest): Observable<RentPayment> {
    return this.http.post<RentPayment>(`/api/rent-payments/${paymentId}/refunds`, request);
  }

  reverse(paymentId: string, paymentVersion: number, reason: string): Observable<RentPayment> {
    return this.http.post<RentPayment>(`/api/rent-payments/${paymentId}/reversal`, {
      paymentVersion,
      reason,
    });
  }

  downloadReceipt(id: string): Observable<Blob> {
    return this.http.get(`/api/rent-payments/${id}/receipt`, { responseType: 'blob' });
  }
}