/**
 * rTube demo — client-side video library controller.
 *
 * Handles video selection from the sidebar, search filtering,
 * playback (or warning for unplayable formats), and copy-link.
 * No WebSocket — all local state with seed data baked into the HTML.
 */

/* ─── Helpers ──────────────────────────────────────────────── */

function isPlayable(filename: string): boolean {
	const ext = filename.split(".").pop()?.toLowerCase() || "";
	return ["mp4", "webm", "mov", "ogg", "m4v"].includes(ext);
}

function getExt(filename: string): string {
	return filename.split(".").pop()?.toLowerCase() || "";
}

/* ─── DOM refs ─────────────────────────────────────────────── */

const sidebar = document.getElementById("rd-video-sidebar") as HTMLElement;
const videoList = document.getElementById("rd-video-list") as HTMLElement;
const searchInput = document.getElementById("rd-video-search") as HTMLInputElement;
const emptyMsg = document.getElementById("rd-video-empty") as HTMLElement;
const playerContainer = document.getElementById("rd-player-container") as HTMLElement;
const placeholder = document.getElementById("rd-player-placeholder") as HTMLElement;
const infoBar = document.getElementById("rd-video-info") as HTMLElement;
const videoNameEl = document.getElementById("rd-video-name") as HTMLElement;
const downloadBtn = document.getElementById("rd-download-btn") as HTMLAnchorElement;
const copyLinkBtn = document.getElementById("rd-copy-link-btn") as HTMLButtonElement;

/* ─── State ─────────────────────────────────────────────────── */

let currentVideo: string | null = null;

/* ─── Video selection ──────────────────────────────────────── */

function selectVideo(filename: string): void {
	currentVideo = filename;

	// Update active state in sidebar
	const items = videoList.querySelectorAll<HTMLElement>(".rd-tube-item");
	for (const item of items) {
		if (item.dataset.video === filename) {
			item.classList.add("rd-tube-item--active");
		} else {
			item.classList.remove("rd-tube-item--active");
		}
	}

	const ext = getExt(filename);
	const playable = isPlayable(filename);

	// Clear player container (keep only the placeholder, hidden)
	playerContainer.innerHTML = "";

	if (playable) {
		// Create video element
		const video = document.createElement("video");
		video.controls = true;
		video.autoplay = true;
		video.preload = "auto";
		video.style.width = "100%";
		video.style.height = "100%";

		const source = document.createElement("source");
		// Demo: point to a placeholder URL (no real video files)
		source.src = `#demo-video/${encodeURIComponent(filename)}`;
		source.type = ext === "webm" ? "video/webm" : "video/mp4";
		video.appendChild(source);

		// Suppress error UI for missing demo files
		video.addEventListener("error", () => {
			playerContainer.innerHTML = `
				<div class="rd-tube-warning">
					<div class="rd-tube-warning__icon">\u{1F3AC}</div>
					<p><span class="rd-tube-warning__ext">${filename}</span></p>
					<p class="rd-tube-warning__hint">Demo mode — no actual video files loaded.<br>In a real space, this would stream from Cloudflare R2.</p>
				</div>`;
		});

		playerContainer.appendChild(video);
	} else {
		// Show unplayable warning
		playerContainer.innerHTML = `
			<div class="rd-tube-warning">
				<div class="rd-tube-warning__icon">\u26A0\uFE0F</div>
				<p><span class="rd-tube-warning__ext">${ext.toUpperCase()}</span> files cannot play in browsers</p>
				<p class="rd-tube-warning__hint">Download to play locally, or re-record in MP4 format</p>
			</div>`;
	}

	// Show info bar
	infoBar.style.display = "";
	videoNameEl.textContent = filename;
	downloadBtn.href = "#";
}

/* ─── Event delegation: sidebar clicks ─────────────────────── */

sidebar.addEventListener("click", (e) => {
	const item = (e.target as HTMLElement).closest<HTMLElement>("[data-video]");
	if (!item) return;
	const filename = item.dataset.video;
	if (filename) selectVideo(filename);
});

// Keyboard support (Enter/Space on focused items)
sidebar.addEventListener("keydown", (e) => {
	if (e.key !== "Enter" && e.key !== " ") return;
	const item = (e.target as HTMLElement).closest<HTMLElement>("[data-video]");
	if (!item) return;
	e.preventDefault();
	const filename = item.dataset.video;
	if (filename) selectVideo(filename);
});

/* ─── Search filtering ─────────────────────────────────────── */

searchInput.addEventListener("input", () => {
	const query = searchInput.value.toLowerCase().trim();
	const items = videoList.querySelectorAll<HTMLElement>(".rd-tube-item");
	let visibleCount = 0;

	for (const item of items) {
		const name = (item.dataset.video || "").toLowerCase();
		const matches = !query || name.includes(query);
		item.style.display = matches ? "" : "none";
		if (matches) visibleCount++;
	}

	emptyMsg.style.display = visibleCount === 0 ? "" : "none";
});

/* ─── Copy link ────────────────────────────────────────────── */

copyLinkBtn.addEventListener("click", () => {
	if (!currentVideo) return;
	const url = `${window.location.origin}/api/v/${encodeURIComponent(currentVideo)}`;

	navigator.clipboard.writeText(url).then(
		() => {
			const original = copyLinkBtn.textContent;
			copyLinkBtn.textContent = "Copied!";
			setTimeout(() => {
				copyLinkBtn.innerHTML = `
					<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>
					Copy Link`;
			}, 1500);
		},
		(err) => {
			console.error("[Tube] Copy failed:", err);
		},
	);
});