/**
 * @param {string} type
 * @param {?{classNames: ?string[], content: ?string, attributes: ?Object.<string, string>, onClick: ?(() => void)}} props
 * @param  {?HTMLElement[]} children
 * @returns {HTMLElement}
 */
function element(type, props, children) {
	let element = document.createElement(type);

	if (props?.classNames != null && props.classNames.length > 0) {
		element.classList.add(props.classNames);
	}

	if (props?.content != null) {
		element.innerText = props.content;
	}

	if (props?.attributes != null) {
		for (let attribute in props.attributes) {
			element.setAttribute(attribute, props.attributes[attribute]);
		}
	}

	if (props?.onClick != null) {
		element.onclick = props.onClick;
	}

	if (children != null) {
		for (let child of children) {
			element.appendChild(child);
		}
	}

	return element;
}

const components = {

	/**
	 * @param {string} name
	 * @param {Video[]} videos
	 * @returns {HTMLElement}
	 */
	series(name, videos) {
		return element("div", { classNames: ["series"] }, [
			element("a", { content: name, attributes: { "href": "/series.html?name=" + encodeURIComponent(name) } }),
			element("div", { content: [...new Set(videos.map(v => v.metadata.author))].join(", "), classNames: ["series-authors"] }),
			element("div", { classNames: ["series-videos"] }, videos.map(v => components.video(v)))
		]);
	},

	/**
	 * @param {Video} video
	 * @returns {HTMLElement}
	 */
	video(video) {
		return element("a", { classNames: ["video"], attributes: { "href": "/watch.html?id=" + encodeURIComponent(video.id), "target": "_blank" } }, [
			element("img", { attributes: { "src": API_URL + "/library/video/" + encodeURIComponent(video.id) + "/thumbnail" } }),
			element("span", { content: video.metadata.title }),
		]);
	},

	/**
	 * @param {Video} video
	 * @returns {HTMLElement}
	 */
	player(video) {
		const streamURL = API_URL + "/library/video/" + encodeURIComponent(video.id) + "/stream";

		const downloadVideo = () => {
			window.location.href = streamURL;
		};

		return element("div", { classNames: ["player"] }, [
			element("div", { content: video.metadata.title, classNames: ["player-title"] }),
			element("div", { content: video.metadata.author, classNames: ["player-author"] }),
			element("video", { attributes: { "poster": API_URL + "/library/video/" + encodeURIComponent(video.id) + "/thumbnail" } }, [
				element("source", { attributes: { "src": streamURL } })
			]),
			element("button", { onClick: downloadVideo }, [
				element("img", { attributes: { "src": "/icon/download.svg", "width": "24", "height": "24" } }),
				element("span", { content: "Download" }),
			]),
			components.videoMetadata(video)
		]);
	},

	/**
	 * @param {Video} video
	 * @returns {HTMLElement}
	 */
	videoMetadata(video) {
		return element("details", { classNames: ["video-metadata"] }, [
			element("summary", { content: "Metadata" }),
			element("div", { classNames: ["video-metadata-table"] }, [
				element("span", { content: "Title" }),
				element("input", { attributes: { "value": video.metadata.title } }),
				element("span", { content: "Series" }),
				element("input", { attributes: { "value": video.metadata.series } }),
				element("span", { content: "Author" }),
				element("input", { attributes: { "value": video.metadata.author } }),
				element("span", { content: "Index" }),
				element("input", { attributes: { "value": video.metadata.index } }),
			]),
			element("button", { content: "Update" })
		]);
	},

	/**
	 * @param {any} error
	 * @returns {HTMLElement}
	 */
	error(error) {
		return element("div", { classNames: ["error"] }, [
			element("b", { content: "Oops, an unexpected error occurred" }),
			element("span", { content: errorToString(error) }),
			element("button", { content: "Reload", onClick: () => window.location.reload() })
		]);
	}

}