import { TestBed } from '@angular/core/testing';
import { RuleService, RuleType } from './rule-service';
import { vi } from 'vitest';
import { CalendarSettingsService } from './calendar-settings-service';
import { PlanningDurationService } from './planning-duration.service';
import { UserInputService } from './user-input-service';
import { SelectableDayType } from './calendar-service';
import { createPlanningCalculation } from './leave-planner.service';

describe('saved rule migration', () => {
	beforeEach(() => localStorage.clear());
	afterEach(() => {
		vi.restoreAllMocks();
		vi.unstubAllGlobals();
		TestBed.resetTestingModule();
		localStorage.clear();
	});

	it('restores every legacy record unchanged between loss prevention and the other five presets', () => {
		const legacy = [
			{
				id: 'personal-window',
				name: 'My fixed window',
				type: RuleType.TIME_WINDOW,
				enabled: true,
				force: 'obligation',
				startDate: '2024-01-10',
				endDate: '2024-01-12',
				placeDays: 2,
				placeType: 'cp',
			},
			{
				id: 'personal-pattern',
				name: 'My disabled pattern',
				type: RuleType.IF_THEN,
				enabled: false,
				dayOfWeek: 6,
				placeDays: 2,
				placeType: 'cp',
				placement: 'around',
				rewardDays: 1,
				rewardType: 'other',
			},
		];
		localStorage.setItem('vacationRules', JSON.stringify(legacy));
		const service = TestBed.inject(RuleService);
		expect(service.rules).toHaveLength(8);
		expect(service.rules.slice(1, 3).map(({ id }) => id)).toEqual([
			'personal-window',
			'personal-pattern',
		]);
		const saved = JSON.parse(localStorage.getItem('vacationRules')!);
		expect(saved.version).toBe(1);
		expect(saved.rules.slice(1, 3)).toEqual(legacy);
		expect(service.rules[2].force).toBe('preference');
		expect(saved.rules[2]).not.toHaveProperty('force');
	});

	it('gives fresh users the six active presets around the two existing initial rules', () => {
		const service = TestBed.inject(RuleService);
		expect(service.rules.map(({ id }) => id)).toEqual([
			'default-unplaced-at-risk',
			'default-samedi-malin',
			'default-christmas',
			'default-holiday-week-value',
			'default-non-working-day-gain',
			'default-longest-work-sequence',
			'default-short-sequence-deficit',
			'default-supporting-placements',
		]);
		const presets = service.rules.filter(({ type }) => type === RuleType.OPTIMIZATION);
		expect(presets).toHaveLength(6);
		expect(presets.every(({ enabled, force }) => enabled && force === 'preference')).toBe(true);
	});

	it('migrates an old empty list once and retains editing, order, disabled and deleted choices immediately', () => {
		localStorage.setItem('vacationRules', '[]');
		let service = TestBed.inject(RuleService);
		expect(service.rules).toHaveLength(6);
		const deficit = service.rules[4];
		if (
			deficit.type !== RuleType.OPTIMIZATION ||
			deficit.configuration.measure !== 'work-sequence-deficit'
		)
			throw new Error('Expected the deficit preset');
		service.updateRule({
			...deficit,
			name: 'My three-day deficit',
			configuration: { ...deficit.configuration, thresholdDays: 3 },
		});
		service.reorderRules(4, 0);
		service.toggleRule(deficit.id);
		service.deleteRule('default-holiday-week-value');
		const expected = service.rules;
		TestBed.resetTestingModule();
		service = TestBed.inject(RuleService);
		expect(service.rules).toEqual(expected);
		expect(service.rules[0]).toMatchObject({
			name: 'My three-day deficit',
			enabled: false,
			configuration: { thresholdDays: 3 },
		});
		for (const rule of service.rules) service.deleteRule(rule.id);
		TestBed.resetTestingModule();
		expect(TestBed.inject(RuleService).rules).toEqual([]);
		expect(JSON.parse(localStorage.getItem('vacationRules')!)).toEqual({
			version: 1,
			rules: [],
		});
	});

	it('avoids colliding with existing custom identities without replacing their records', () => {
		const custom = ['default-unplaced-at-risk', 'default-unplaced-at-risk-2'].map((id) => ({
			id,
			name: id,
			type: RuleType.IF_THEN,
			enabled: false,
			dayOfWeek: 6,
			placeDays: 2,
			placeType: 'cp',
			placement: 'auto',
			rewardDays: 1,
			rewardType: 'other',
		}));
		localStorage.setItem('vacationRules', JSON.stringify(custom));
		const rules = TestBed.inject(RuleService).rules;
		expect(rules[0].id).toBe('default-unplaced-at-risk-3');
		expect(new Set(rules.map(({ id }) => id)).size).toBe(8);
		expect(JSON.parse(localStorage.getItem('vacationRules')!).rules.slice(1, 3)).toEqual(
			custom,
		);
	});

	it('saves the migrated list and version in one atomic write and retries after a failed save', () => {
		localStorage.setItem('vacationRules', '[]');
		vi.spyOn(console, 'warn').mockImplementation(() => undefined);
		const save = vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
			throw new Error('quota');
		});
		let service = TestBed.inject(RuleService);
		expect(service.rules).toHaveLength(6);
		expect(save).toHaveBeenCalledOnce();
		expect(localStorage.getItem('vacationRules')).toBe('[]');
		service.toggleRule(service.rules[0].id);
		expect(localStorage.getItem('vacationRules')).toBe('[]');
		save.mockRestore();
		TestBed.resetTestingModule();
		service = TestBed.inject(RuleService);
		expect(service.rules).toHaveLength(6);
		expect(service.rules[0].enabled).toBe(true);
		expect(JSON.parse(localStorage.getItem('vacationRules')!).version).toBe(1);
	});

	it('keeps edits usable and saves the entire current list once storage recovers', () => {
		localStorage.setItem('vacationRules', '[]');
		const service = TestBed.inject(RuleService);
		const prior = localStorage.getItem('vacationRules');
		vi.spyOn(console, 'warn').mockImplementation(() => undefined);
		const save = vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
			throw new Error('quota');
		});
		service.toggleRule(service.rules[0].id);
		expect(service.rules[0].enabled).toBe(false);
		expect(localStorage.getItem('vacationRules')).toBe(prior);
		save.mockRestore();
		service.deleteRule(service.rules[1].id);
		const expected = service.rules;
		TestBed.resetTestingModule();
		expect(TestBed.inject(RuleService).rules).toEqual(expected);
	});

	it.each(['{"version":2,"rules":[]}', '{broken', 'null', '[null]'])(
		'preserves unsupported saved data through subsequent edits: %s',
		(saved) => {
			localStorage.setItem('vacationRules', saved);
			vi.spyOn(console, 'warn').mockImplementation(() => undefined);
			const save = vi.spyOn(Storage.prototype, 'setItem');
			const service = TestBed.inject(RuleService);
			service.toggleRule(service.rules[0].id);
			expect(save).not.toHaveBeenCalled();
			expect(localStorage.getItem('vacationRules')).toBe(saved);
		},
	);

	it('prevents edits from overwriting unknown valid saved data after a read failure', () => {
		const saved = '{"version":1,"rules":[]}';
		localStorage.setItem('vacationRules', saved);
		vi.spyOn(console, 'warn').mockImplementation(() => undefined);
		const read = vi.spyOn(Storage.prototype, 'getItem').mockImplementation(() => {
			throw new Error('denied');
		});
		const service = TestBed.inject(RuleService);
		read.mockRestore();
		const write = vi.spyOn(Storage.prototype, 'setItem');
		service.toggleRule(service.rules[0].id);
		expect(write).not.toHaveBeenCalled();
		expect(localStorage.getItem('vacationRules')).toBe(saved);
	});

	it('works in memory when browser storage is unavailable', () => {
		vi.stubGlobal('localStorage', undefined);
		const service = TestBed.inject(RuleService);
		expect(service.rules).toHaveLength(8);
		service.toggleRule(service.rules[0].id);
		expect(service.rules[0].enabled).toBe(false);
	});

	it.each(['disabled', 'deleted'])(
		'keeps a migrated %s list inactive after reload while preserving declarations and at-risk quantities',
		async (choice) => {
			localStorage.setItem('vacationRules', '[]');
			const service = TestBed.inject(RuleService);
			for (const rule of service.rules) {
				if (choice === 'disabled') service.toggleRule(rule.id);
				else service.deleteRule(rule.id);
			}
			const saved = localStorage.getItem('vacationRules');
			TestBed.resetTestingModule();
			const restored = TestBed.inject(RuleService).rules;
			expect(restored).toHaveLength(choice === 'disabled' ? 6 : 0);
			expect(restored.every(({ enabled }) => !enabled)).toBe(true);
			expect(localStorage.getItem('vacationRules')).toBe(saved);
			vi.stubGlobal('window', undefined);
			const calculation = createPlanningCalculation({
				horizon: { start: '2024-01-02', end: '2024-01-05' },
				balances: [{ id: 'cp', type: 'cp', quantity: 2, expiryDate: '2024-01-04' }],
				declaredDays: [{ date: '2024-01-03', type: 'other' }],
				rules: restored,
			});
			const outcome = await calculation.outcome;
			expect(outcome).toMatchObject({
				kind: 'Plan',
				placements: [],
				declaredDays: [{ date: '2024-01-03', type: 'other' }],
				remainingBalances: [
					{
						id: 'cp',
						quantity: 2,
						classification: 'at-risk',
						reason: { code: 'active-priorities' },
					},
				],
			});
			expect(await calculation.explanation).toMatchObject({
				kind: 'PlanExplanation',
				placements: [],
			});
		},
	);

	it('migrates before the first duration request and actual calculation', async () => {
		localStorage.setItem('vacationRules', '[]');
		TestBed.inject(CalendarSettingsService).setPlanningDates('2024-01-02', '2024-01-05');
		TestBed.inject(UserInputService).updateBalances(() => [
			{
				id: 'cp',
				type: SelectableDayType.CP,
				numberOfDays: 1,
				availableDate: new Date('2024-01-02'),
				expiryDate: new Date('2024-01-05'),
			},
		]);
		const request = TestBed.inject(PlanningDurationService).request()!;
		expect(request.rules).toHaveLength(6);
		expect(JSON.parse(localStorage.getItem('vacationRules')!).version).toBe(1);
		vi.stubGlobal('window', undefined);
		const calculation = createPlanningCalculation(request);
		const outcome = await calculation.outcome;
		expect(outcome).toMatchObject({
			kind: 'Plan',
			metrics: { unplacedAtRisk: 0 },
			placements: [{ balanceId: 'cp' }],
		});
	});
});