import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { vi } from 'vitest';
import { mkdtemp, rm } from 'fs/promises';
import { join } from 'path';
import { tmpdir } from 'os';

// Set DATA_DIR before db module is imported (module-level DB init)
const TEST_DATA_DIR = join(tmpdir(), 'whisper-pwa-db-test-' + Date.now());
vi.stubEnv('DATA_DIR', TEST_DATA_DIR);

import {
	createJob,
	getJob,
	listJobs,
	updateJob,
	setJobStatus,
	savePushSubscription,
	getAllSubscriptions,
	deletePushSubscription
} from '$lib/server/db.js';

afterAll(async () => {
	await rm(TEST_DATA_DIR, { recursive: true, force: true });
});

// ── createJob / getJob ────────────────────────────────────────────────────────

describe('createJob', () => {
	it('creates a job and returns it with a UUID', () => {
		const job = createJob('https://youtu.be/abc', 'My Video', 'auto');
		expect(job.id).toMatch(/^[0-9a-f-]{36}$/);
		expect(job.source).toBe('https://youtu.be/abc');
		expect(job.title).toBe('My Video');
		expect(job.audioMode).toBe('auto');
	});

	it('defaults status to pending', () => {
		const job = createJob('src', 'title', 'standard');
		expect(job.status).toBe('pending');
	});

	it('defaults progress to 0', () => {
		const job = createJob('src', 'title', 'none');
		expect(job.progress).toBe(0);
	});

	it('assigns unique IDs to each job', () => {
		const a = createJob('src', 'A', 'auto');
		const b = createJob('src', 'B', 'auto');
		expect(a.id).not.toBe(b.id);
	});
});

describe('getJob', () => {
	it('returns null for an unknown id', () => {
		expect(getJob('00000000-0000-0000-0000-000000000000')).toBeNull();
	});

	it('returns the correct job by id', () => {
		const created = createJob('https://youtu.be/xyz', 'Find Me', 'aggressive');
		const found = getJob(created.id);
		expect(found).not.toBeNull();
		expect(found!.id).toBe(created.id);
		expect(found!.title).toBe('Find Me');
	});
});

// ── updateJob ─────────────────────────────────────────────────────────────────

describe('updateJob', () => {
	it('updates only specified fields, preserving others', () => {
		const job = createJob('src', 'Original Title', 'auto');
		updateJob({ id: job.id, title: 'New Title' });
		const updated = getJob(job.id)!;
		expect(updated.title).toBe('New Title');
		expect(updated.source).toBe('src'); // unchanged
		expect(updated.audioMode).toBe('auto'); // unchanged
	});

	it('stores whisperJobId', () => {
		const job = createJob('src', 'title', 'auto');
		updateJob({ id: job.id, whisperJobId: 'whisper-uuid-123' });
		expect(getJob(job.id)!.whisperJobId).toBe('whisper-uuid-123');
	});

	it('stores meanVolume', () => {
		const job = createJob('src', 'title', 'auto');
		updateJob({ id: job.id, meanVolume: -20.5 });
		expect(getJob(job.id)!.meanVolume).toBe(-20.5);
	});

	it('stores segmentsJson', () => {
		const job = createJob('src', 'title', 'auto');
		const json = JSON.stringify([{ index: 0, start: 0, end: 5, text: 'Hello', words: [] }]);
		updateJob({ id: job.id, segmentsJson: json });
		expect(getJob(job.id)!.segmentsJson).toBe(json);
	});

	it('stores error message', () => {
		const job = createJob('src', 'title', 'auto');
		updateJob({ id: job.id, status: 'failed', error: 'something went wrong' });
		const updated = getJob(job.id)!;
		expect(updated.status).toBe('failed');
		expect(updated.error).toBe('something went wrong');
	});

	it('does nothing for an unknown id', () => {
		expect(() => updateJob({ id: 'no-such-id', title: 'Ghost' })).not.toThrow();
	});
});

// ── setJobStatus ──────────────────────────────────────────────────────────────

describe('setJobStatus', () => {
	it('updates status without touching other fields', () => {
		const job = createJob('src', 'Status Test', 'auto');
		setJobStatus(job.id, 'downloading', 5);
		const updated = getJob(job.id)!;
		expect(updated.status).toBe('downloading');
		expect(updated.progress).toBe(5);
		expect(updated.title).toBe('Status Test'); // unchanged
	});

	it('transitions through all valid statuses', () => {
		const job = createJob('src', 'title', 'auto');
		const statuses = ['downloading', 'preparing', 'transcribing', 'processing', 'done'] as const;
		for (const status of statuses) {
			setJobStatus(job.id, status, 50);
			expect(getJob(job.id)!.status).toBe(status);
		}
	});

	it('defaults progress to 0 if not supplied', () => {
		const job = createJob('src', 'title', 'auto');
		setJobStatus(job.id, 'preparing');
		expect(getJob(job.id)!.progress).toBe(0);
	});
});

// ── listJobs ──────────────────────────────────────────────────────────────────

describe('listJobs', () => {
	it('returns jobs in descending creation order', () => {
		const a = createJob('src', 'Alpha', 'auto');
		const b = createJob('src', 'Beta', 'auto');
		const jobs = listJobs();
		const ids = jobs.map((j) => j.id);
		expect(ids.indexOf(b.id)).toBeLessThan(ids.indexOf(a.id));
	});

	it('returns an array (possibly empty)', () => {
		expect(Array.isArray(listJobs())).toBe(true);
	});
});

// ── Push subscriptions ────────────────────────────────────────────────────────

describe('push subscriptions', () => {
	const sub1 = { endpoint: 'https://push.example.com/abc', p256dh: 'p256dh-value-1', auth: 'auth-1' };
	const sub2 = { endpoint: 'https://push.example.com/xyz', p256dh: 'p256dh-value-2', auth: 'auth-2' };

	it('saves and retrieves a subscription', () => {
		savePushSubscription(sub1);
		const subs = getAllSubscriptions();
		const found = subs.find((s) => s.endpoint === sub1.endpoint);
		expect(found).toBeDefined();
		expect(found!.p256dh).toBe(sub1.p256dh);
		expect(found!.auth).toBe(sub1.auth);
	});

	it('upserts on duplicate endpoint (updates keys)', () => {
		savePushSubscription(sub1);
		const updated = { ...sub1, p256dh: 'new-p256dh', auth: 'new-auth' };
		savePushSubscription(updated);
		const subs = getAllSubscriptions().filter((s) => s.endpoint === sub1.endpoint);
		expect(subs).toHaveLength(1);
		expect(subs[0].p256dh).toBe('new-p256dh');
	});

	it('deletes by endpoint', () => {
		savePushSubscription(sub2);
		deletePushSubscription(sub2.endpoint);
		const found = getAllSubscriptions().find((s) => s.endpoint === sub2.endpoint);
		expect(found).toBeUndefined();
	});

	it('stores multiple subscriptions independently', () => {
		savePushSubscription(sub1);
		savePushSubscription(sub2);
		const subs = getAllSubscriptions();
		const endpoints = subs.map((s) => s.endpoint);
		expect(endpoints).toContain(sub1.endpoint);
		expect(endpoints).toContain(sub2.endpoint);
	});
});