import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import {
	createPhoto,
	getPhotosByItemId,
	getPhotoById,
	deletePhoto,
	deletePhotosByItemId,
	blobToDataURL,
} from './photos';
import { getDB, resetDBPromise } from './db';

// Mock canvas for thumbnail generation
beforeEach(() => {
	// Mock canvas context
	const mockContext = {
		drawImage: vi.fn(),
	};

	// Mock HTMLCanvasElement
	// eslint-disable-next-line @typescript-eslint/no-explicit-any
	HTMLCanvasElement.prototype.getContext = vi.fn(() => mockContext) as any;
	HTMLCanvasElement.prototype.toBlob = vi.fn(function (callback) {
		callback?.(new Blob(['thumbnail'], { type: 'image/jpeg' }));
	});

	// Mock HTMLImageElement
	global.Image = class {
		onload: (() => void) | null = null;
		onerror: (() => void) | null = null;
		src = '';
		width = 1920;
		height = 1080;

		constructor() {
			setTimeout(() => {
				this.onload?.();
			}, 0);
		}
	} as unknown as typeof Image;

	// Mock URL.createObjectURL
	global.URL.createObjectURL = vi.fn(() => 'blob:mock-url');
	global.URL.revokeObjectURL = vi.fn();
});

afterEach(async () => {
	// Clean up database between tests
	const db = await getDB();
	await db.clear('photos');
	await resetDBPromise();
});

describe('photos', () => {
	describe('createPhoto', () => {
		it('creates a photo with thumbnail', async () => {
			const blob = new Blob(['test image'], { type: 'image/jpeg' });
			const photo = await createPhoto('item_abc', blob);

			expect(photo.id).toMatch(/^photo_/);
			expect(photo.itemId).toBe('item_abc');
			expect(photo.blob).toBe(blob);
			expect(photo.thumbnail).toBeInstanceOf(Blob);
			expect(photo.createdAt).toBeTruthy();

			// Verify it was saved to DB
			const db = await getDB();
			const saved = await db.get('photos', photo.id);
			expect(saved?.id).toBe(photo.id);
			expect(saved?.itemId).toBe(photo.itemId);
			expect(saved?.createdAt).toBe(photo.createdAt);
		});

		it('generates unique IDs', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			const photo1 = await createPhoto('item_abc', blob);
			const photo2 = await createPhoto('item_abc', blob);

			expect(photo1.id).not.toBe(photo2.id);
		});
	});

	describe('getPhotosByItemId', () => {
		it('returns all photos for an item', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			const photo1 = await createPhoto('item_abc', blob);
			const photo2 = await createPhoto('item_abc', blob);
			await createPhoto('item_xyz', blob); // different item

			const photos = await getPhotosByItemId('item_abc');

			expect(photos).toHaveLength(2);
			expect(photos.map((p) => p.id).sort()).toEqual([photo1.id, photo2.id].sort());
		});

		it('returns empty array if no photos', async () => {
			const photos = await getPhotosByItemId('nonexistent');
			expect(photos).toEqual([]);
		});
	});

	describe('getPhotoById', () => {
		it('returns a photo by ID', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			const photo = await createPhoto('item_abc', blob);

			const retrieved = await getPhotoById(photo.id);
			expect(retrieved?.id).toBe(photo.id);
			expect(retrieved?.itemId).toBe(photo.itemId);
		});

		it('returns undefined if not found', async () => {
			const photo = await getPhotoById('nonexistent');
			expect(photo).toBeUndefined();
		});
	});

	describe('deletePhoto', () => {
		it('deletes a photo', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			const photo = await createPhoto('item_abc', blob);

			await deletePhoto(photo.id);

			const retrieved = await getPhotoById(photo.id);
			expect(retrieved).toBeUndefined();
		});
	});

	describe('deletePhotosByItemId', () => {
		it('deletes all photos for an item', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			await createPhoto('item_abc', blob);
			await createPhoto('item_abc', blob);
			const photo3 = await createPhoto('item_xyz', blob); // different item

			await deletePhotosByItemId('item_abc');

			const photos = await getPhotosByItemId('item_abc');
			expect(photos).toEqual([]);

			// Other item's photos should remain
			const otherPhotos = await getPhotosByItemId('item_xyz');
			expect(otherPhotos).toHaveLength(1);
			expect(otherPhotos[0].id).toBe(photo3.id);
		});
	});

	describe('blobToDataURL', () => {
		it('converts a blob to data URL', async () => {
			const blob = new Blob(['test'], { type: 'image/jpeg' });
			const dataUrl = await blobToDataURL(blob);

			expect(dataUrl).toMatch(/^data:image\/jpeg;base64,/);
		});
	});
});