import test from 'node:test';
import assert from 'node:assert/strict';
import {
	createMediaAdapter,
	ImageCarouselMediaAdapter,
	ImageMediaAdapter,
	VideoMediaAdapter
} from '../vr180player/media/media-adapter.js';

function createClassList() {
	return {
		values: [],
		add(...values) {
			this.values.push(...values);
		}
	};
}

function createVideo({
	ended = false,
	paused = false,
	source = 'https://cdn.example.com/videos/demo-video.mp4',
	title = ''
} = {}) {
	return {
		HAVE_METADATA: 1,
		classList: createClassList(),
		ended,
		loadCount: 0,
		paused,
		readyState: 0,
		style: { display: '' },
		tagName: 'VIDEO',
		addEventListener() {},
		getAttribute(name) {
			return name === 'title' ? title : '';
		},
		load() {
			this.loadCount += 1;
		},
		querySelector(selector) {
			if (selector !== 'source' || !source) {
				return null;
			}

			return { src: source };
		}
	};
}

function createImage({
	alt = '',
	complete = true,
	naturalWidth = 1920,
	source = 'https://cdn.example.com/images/demo-image.png',
	title = ''
} = {}) {
	return {
		alt,
		classList: createClassList(),
		complete,
		currentSrc: source,
		listeners: {},
		naturalWidth,
		src: source,
		style: { display: '' },
		tagName: 'IMG',
		addEventListener(type, listener) {
			this.listeners[type] ??= [];
			this.listeners[type].push(listener);
		},
		dispatch(type) {
			for (const listener of this.listeners[type] ?? []) {
				listener({ currentTarget: this });
			}
		},
		getAttribute(name) {
			if (name === 'title') return title;
			if (name === 'alt') return alt;
			return '';
		}
	};
}

test('VideoMediaAdapter exposes video capabilities and lifecycle helpers', () => {
	const video = createVideo({ title: 'Demo Title' });
	const adapter = new VideoMediaAdapter(video);

	assert.deepEqual(adapter.capabilities, {
		audio: true,
		carousel: false,
		dynamicTexture: true,
		navigation: true,
		playback: true,
		timeline: true
	});
	assert.equal(adapter.element, video);
	assert.equal(adapter.textureSource, video);
	assert.equal(adapter.getTitle(), 'Demo Title');

	adapter.hideElement();
	assert.equal(video.style.display, 'none');

	adapter.showElement();
	assert.equal(video.style.display, '');

	adapter.load();
	assert.equal(video.loadCount, 1);
});

test('VideoMediaAdapter falls back to source filename and tracks texture update state', () => {
	const video = createVideo({ source: 'https://cdn.example.com/media/flat-sbs-demo.mp4' });
	const adapter = new VideoMediaAdapter(video);

	assert.equal(adapter.getTitle(), 'flat sbs demo');
	assert.equal(adapter.shouldUpdateTexture(), true);

	video.paused = true;
	assert.equal(adapter.shouldUpdateTexture(), false);

	video.paused = false;
	video.ended = true;
	assert.equal(adapter.shouldUpdateTexture(), false);
});

test('ImageMediaAdapter exposes static image capabilities and lifecycle helpers', async () => {
	const image = createImage({ alt: 'Alt Title' });
	const adapter = new ImageMediaAdapter(image);
	let readyCount = 0;

	adapter.bindLoadState({
		onError: () => {},
		onReady: () => {
			readyCount += 1;
		}
	});

	await new Promise((resolve) => setImmediate(resolve));

	assert.deepEqual(adapter.capabilities, {
		audio: false,
		carousel: false,
		dynamicTexture: false,
		navigation: false,
		playback: false,
		timeline: false
	});
	assert.equal(adapter.element, image);
	assert.equal(adapter.textureSource, image);
	assert.equal(adapter.getTitle(), 'Alt Title');
	assert.equal(adapter.shouldUpdateTexture(), false);
	assert.equal(readyCount, 1);

	adapter.hideElement();
	assert.equal(image.style.display, 'none');

	adapter.showElement();
	assert.equal(image.style.display, '');
});

test('ImageMediaAdapter falls back to source filename', () => {
	const image = createImage({ alt: '', source: 'https://cdn.example.com/media/static-sbs-demo.png' });
	const adapter = new ImageMediaAdapter(image);

	assert.equal(adapter.getTitle(), 'static sbs demo');
});

test('ImageCarouselMediaAdapter exposes carousel image navigation', () => {
	const firstImage = createImage({ title: 'First image', source: 'https://cdn.example.com/media/first.png' });
	const secondImage = createImage({ title: 'Second image', source: 'https://cdn.example.com/media/second.png' });
	const adapter = new ImageCarouselMediaAdapter([firstImage, secondImage]);

	assert.deepEqual(adapter.capabilities, {
		audio: false,
		carousel: true,
		dynamicTexture: false,
		navigation: true,
		playback: false,
		timeline: false
	});
	assert.equal(adapter.element, firstImage);
	assert.equal(adapter.textureSource, firstImage);
	assert.equal(adapter.getTitle(), 'First image');
	assert.equal(firstImage.style.display, '');
	assert.equal(secondImage.style.display, 'none');
	assert.deepEqual(firstImage.classList.values, ['vrwp-media', 'vrwp-image', 'vrwp-carousel-image']);
	assert.deepEqual(secondImage.classList.values, ['vrwp-media', 'vrwp-image', 'vrwp-carousel-image']);

	assert.equal(adapter.next(), true);
	assert.equal(adapter.element, secondImage);
	assert.equal(adapter.textureSource, secondImage);
	assert.equal(adapter.getTitle(), 'Second image');
	assert.equal(firstImage.style.display, 'none');
	assert.equal(secondImage.style.display, '');

	assert.equal(adapter.next(), true);
	assert.equal(adapter.element, firstImage);

	adapter.hideElement();
	assert.equal(firstImage.style.display, 'none');
	assert.equal(secondImage.style.display, 'none');

	adapter.previous();
	adapter.showElement();
	assert.equal(adapter.element, secondImage);
	assert.equal(firstImage.style.display, 'none');
	assert.equal(secondImage.style.display, '');

	adapter.load();
	assert.equal(firstImage.loading, 'eager');
	assert.equal(secondImage.loading, 'eager');
});

test('ImageCarouselMediaAdapter waits for all images before reporting ready', async () => {
	const firstImage = createImage({ complete: false, naturalWidth: 0 });
	const secondImage = createImage({ complete: false, naturalWidth: 0 });
	const adapter = new ImageCarouselMediaAdapter([firstImage, secondImage]);
	let readyCount = 0;

	adapter.bindLoadState({
		onError: () => {},
		onReady: () => {
			readyCount += 1;
		}
	});

	await new Promise((resolve) => setImmediate(resolve));
	assert.equal(readyCount, 0);

	firstImage.complete = true;
	firstImage.naturalWidth = 1920;
	firstImage.dispatch('load');
	assert.equal(readyCount, 0);

	secondImage.complete = true;
	secondImage.naturalWidth = 1920;
	secondImage.dispatch('load');
	assert.equal(readyCount, 1);

	firstImage.dispatch('load');
	assert.equal(readyCount, 1);
});

test('createMediaAdapter finds and marks the supported video element', () => {
	const video = createVideo();
	const playerContainer = {
		querySelectorAll(selector) {
			return selector === 'video,img' ? [video] : [];
		}
	};

	const adapter = createMediaAdapter(playerContainer);

	assert.ok(adapter instanceof VideoMediaAdapter);
	assert.equal(adapter.element, video);
	assert.deepEqual(video.classList.values, ['vrwp-media', 'vrwp-video']);
});

test('createMediaAdapter finds and marks the supported image element', () => {
	const image = createImage();
	const playerContainer = {
		querySelectorAll(selector) {
			return selector === 'video,img' ? [image] : [];
		}
	};

	const adapter = createMediaAdapter(playerContainer);

	assert.ok(adapter instanceof ImageMediaAdapter);
	assert.equal(adapter.element, image);
	assert.deepEqual(image.classList.values, ['vrwp-media', 'vrwp-image']);
});

test('createMediaAdapter creates an image carousel when requested', () => {
	const firstImage = createImage({ title: 'First image' });
	const secondImage = createImage({ title: 'Second image' });
	const playerContainer = {
		dataset: { carousel: '' },
		querySelectorAll(selector) {
			return selector === 'video,img' ? [firstImage, secondImage] : [];
		}
	};

	const adapter = createMediaAdapter(playerContainer);

	assert.ok(adapter instanceof ImageCarouselMediaAdapter);
	assert.equal(adapter.element, firstImage);
	assert.equal(adapter.next(), true);
	assert.equal(adapter.element, secondImage);
});

test('createMediaAdapter refuses missing or ambiguous media elements', () => {
	const video = createVideo();
	const image = createImage();
	const secondImage = createImage();

	assert.equal(createMediaAdapter({ querySelectorAll: () => [] }), null);
	assert.equal(createMediaAdapter({ querySelectorAll: () => [video, image] }), null);
	assert.equal(createMediaAdapter({ querySelectorAll: () => [image, secondImage] }), null);
	assert.equal(createMediaAdapter({ dataset: { carousel: '' }, querySelectorAll: () => [image] }), null);
	assert.equal(createMediaAdapter({ dataset: { carousel: '' }, querySelectorAll: () => [video, image] }), null);
});