import { FolkShape } from "./folk-shape";
import { css, html } from "./tags";

const styles = css`
	:host {
		background: white;
		border-radius: 8px;
		box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
		min-width: 380px;
		min-height: 480px;
	}

	.header {
		display: flex;
		align-items: center;
		justify-content: space-between;
		padding: 8px 12px;
		background: linear-gradient(135deg, #ea580c, #f59e0b);
		color: white;
		border-radius: 8px 8px 0 0;
		font-size: 12px;
		font-weight: 600;
		cursor: move;
	}

	.header-title {
		display: flex;
		align-items: center;
		gap: 6px;
	}

	.header-actions {
		display: flex;
		gap: 4px;
	}

	.header-actions button {
		background: transparent;
		border: none;
		color: white;
		cursor: pointer;
		padding: 2px 6px;
		border-radius: 4px;
		font-size: 14px;
	}

	.header-actions button:hover {
		background: rgba(255, 255, 255, 0.2);
	}

	.content {
		display: flex;
		flex-direction: column;
		height: calc(100% - 36px);
		overflow: hidden;
	}

	.prompt-area {
		padding: 12px;
		border-bottom: 1px solid #e2e8f0;
	}

	.prompt-input {
		width: 100%;
		padding: 10px 12px;
		border: 2px solid #e2e8f0;
		border-radius: 8px;
		font-size: 13px;
		resize: none;
		outline: none;
		font-family: inherit;
	}

	.prompt-input:focus {
		border-color: #ea580c;
	}

	.controls {
		display: flex;
		gap: 8px;
		margin-top: 8px;
	}

	.generate-btn {
		flex: 1;
		padding: 8px 16px;
		background: linear-gradient(135deg, #ea580c, #f59e0b);
		color: white;
		border: none;
		border-radius: 6px;
		font-size: 13px;
		font-weight: 600;
		cursor: pointer;
		transition: opacity 0.2s;
	}

	.generate-btn:hover {
		opacity: 0.9;
	}

	.generate-btn:disabled {
		opacity: 0.5;
		cursor: not-allowed;
	}

	.tabs {
		display: flex;
		border-bottom: 1px solid #e2e8f0;
	}

	.tab {
		flex: 1;
		padding: 8px;
		text-align: center;
		font-size: 12px;
		font-weight: 600;
		color: #64748b;
		border: none;
		background: none;
		cursor: pointer;
		border-bottom: 2px solid transparent;
		transition: all 0.2s;
	}

	.tab:hover {
		color: #ea580c;
	}

	.tab.active {
		color: #ea580c;
		border-bottom-color: #ea580c;
	}

	.preview-area {
		flex: 1;
		overflow: hidden;
		display: flex;
		flex-direction: column;
	}

	.render-preview {
		flex: 1;
		display: flex;
		align-items: center;
		justify-content: center;
		padding: 12px;
		overflow: hidden;
	}

	.render-preview img {
		max-width: 100%;
		max-height: 100%;
		border-radius: 8px;
		box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
	}

	.code-area {
		flex: 1;
		overflow: auto;
		padding: 12px;
	}

	.code-area pre {
		margin: 0;
		padding: 12px;
		background: #1e293b;
		color: #e2e8f0;
		border-radius: 6px;
		font-size: 11px;
		line-height: 1.5;
		overflow-x: auto;
		white-space: pre-wrap;
		word-break: break-all;
	}

	.download-row {
		display: flex;
		gap: 8px;
		padding: 8px 12px;
		border-top: 1px solid #e2e8f0;
	}

	.download-btn {
		padding: 6px 12px;
		background: #334155;
		color: white;
		border: none;
		border-radius: 6px;
		font-size: 12px;
		cursor: pointer;
		text-decoration: none;
	}

	.download-btn:hover {
		background: #475569;
	}

	.placeholder {
		flex: 1;
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		color: #94a3b8;
		text-align: center;
		gap: 8px;
	}

	.placeholder-icon {
		font-size: 48px;
		opacity: 0.5;
	}

	.loading {
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		padding: 24px;
		gap: 12px;
	}

	.spinner {
		width: 32px;
		height: 32px;
		border: 3px solid #e2e8f0;
		border-top-color: #ea580c;
		border-radius: 50%;
		animation: spin 1s linear infinite;
	}

	@keyframes spin {
		to { transform: rotate(360deg); }
	}

	.error {
		color: #ef4444;
		padding: 12px;
		background: #fef2f2;
		border-radius: 6px;
		font-size: 13px;
		margin: 12px;
	}
`;

declare global {
	interface HTMLElementTagNameMap {
		"folk-blender": FolkBlender;
	}
}

export class FolkBlender extends FolkShape {
	static override tagName = "folk-blender";

	static {
		const sheet = new CSSStyleSheet();
		const parentRules = Array.from(FolkShape.styles.cssRules)
			.map((r) => r.cssText)
			.join("\n");
		const childRules = Array.from(styles.cssRules)
			.map((r) => r.cssText)
			.join("\n");
		sheet.replaceSync(`${parentRules}\n${childRules}`);
		this.styles = sheet;
	}

	#isLoading = false;
	#error: string | null = null;
	#renderUrl: string | null = null;
	#script: string | null = null;
	#blendUrl: string | null = null;
	#activeTab: "preview" | "code" = "preview";
	#promptInput: HTMLTextAreaElement | null = null;
	#generateBtn: HTMLButtonElement | null = null;
	#previewArea: HTMLElement | null = null;
	#codeArea: HTMLElement | null = null;
	#downloadRow: HTMLElement | null = null;

	override createRenderRoot() {
		const root = super.createRenderRoot();

		const wrapper = document.createElement("div");
		wrapper.innerHTML = html`
			<div class="header">
				<span class="header-title">
					<span>🧊</span>
					<span>3D Blender</span>
				</span>
				<div class="header-actions">
					<button class="close-btn" title="Close">×</button>
				</div>
			</div>
			<div class="content">
				<div class="prompt-area">
					<textarea class="prompt-input" placeholder="Describe the 3D scene to generate...\ne.g. 'A low-poly fox sitting on a tree stump'" rows="3"></textarea>
					<div class="controls">
						<button class="generate-btn">🧊 Generate 3D</button>
					</div>
				</div>
				<div class="tabs">
					<button class="tab active" data-tab="preview">🖼️ Render</button>
					<button class="tab" data-tab="code">📜 Script</button>
				</div>
				<div class="preview-area">
					<div class="render-preview">
						<div class="placeholder">
							<span class="placeholder-icon">🧊</span>
							<span>Describe a 3D scene and click Generate</span>
						</div>
					</div>
					<div class="code-area" style="display:none">
						<pre>// Blender Python script will appear here</pre>
					</div>
				</div>
				<div class="download-row" style="display:none">
					<a class="download-btn blend-dl" href="#" download>⬇️ .blend</a>
				</div>
			</div>
		`;

		const slot = root.querySelector("slot");
		const containerDiv = slot?.parentElement as HTMLElement;
		if (containerDiv) {
			containerDiv.replaceWith(wrapper);
		}

		this.#promptInput = wrapper.querySelector(".prompt-input");
		this.#generateBtn = wrapper.querySelector(".generate-btn");
		this.#previewArea = wrapper.querySelector(".render-preview");
		this.#codeArea = wrapper.querySelector(".code-area");
		this.#downloadRow = wrapper.querySelector(".download-row");
		const closeBtn = wrapper.querySelector(".close-btn") as HTMLButtonElement;

		// Tab switching
		wrapper.querySelectorAll(".tab").forEach((tab) => {
			tab.addEventListener("click", (e) => {
				e.stopPropagation();
				const tabName = (tab as HTMLElement).dataset.tab as "preview" | "code";
				this.#activeTab = tabName;
				wrapper.querySelectorAll(".tab").forEach((t) => t.classList.remove("active"));
				tab.classList.add("active");
				if (this.#previewArea) this.#previewArea.style.display = tabName === "preview" ? "flex" : "none";
				if (this.#codeArea) this.#codeArea.style.display = tabName === "code" ? "block" : "none";
			});
		});

		this.#generateBtn?.addEventListener("click", (e) => {
			e.stopPropagation();
			this.#generate();
		});

		this.#promptInput?.addEventListener("keydown", (e) => {
			if (e.key === "Enter" && !e.shiftKey) {
				e.preventDefault();
				this.#generate();
			}
		});
		this.#promptInput?.addEventListener("pointerdown", (e) => e.stopPropagation());

		closeBtn.addEventListener("click", (e) => {
			e.stopPropagation();
			this.dispatchEvent(new CustomEvent("close"));
		});

		return root;
	}

	async #generate() {
		const prompt = this.#promptInput?.value.trim();
		if (!prompt || this.#isLoading) return;

		this.#isLoading = true;
		this.#error = null;
		if (this.#generateBtn) this.#generateBtn.disabled = true;

		if (this.#previewArea) {
			this.#previewArea.innerHTML = '<div class="loading"><div class="spinner"></div><span>Generating 3D scene...</span></div>';
		}

		try {
			const res = await fetch("/api/blender-gen", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({ prompt }),
			});

			if (!res.ok) {
				const err = await res.json().catch(() => ({ error: res.statusText }));
				throw new Error(err.error || "Generation failed");
			}

			const data = await res.json();
			this.#renderUrl = data.render_url || null;
			this.#script = data.script || null;
			this.#blendUrl = data.blend_url || null;

			this.#renderResult();
		} catch (err) {
			this.#error = err instanceof Error ? err.message : "Generation failed";
			if (this.#previewArea) {
				this.#previewArea.innerHTML = `<div class="error">${this.#escapeHtml(this.#error)}</div>`;
			}
		} finally {
			this.#isLoading = false;
			if (this.#generateBtn) this.#generateBtn.disabled = false;
		}
	}

	#renderResult() {
		if (this.#previewArea) {
			if (this.#renderUrl) {
				this.#previewArea.innerHTML = `<img src="${this.#escapeHtml(this.#renderUrl)}" alt="3D Render" />`;
			} else {
				this.#previewArea.innerHTML = '<div class="placeholder"><span class="placeholder-icon">\u2705</span><span>Script generated (see Script tab)</span></div>';
			}
		}

		if (this.#codeArea && this.#script) {
			this.#codeArea.innerHTML = `<pre>${this.#escapeHtml(this.#script)}</pre>`;
		}

		if (this.#downloadRow && this.#blendUrl) {
			this.#downloadRow.style.display = "flex";
			const blendLink = this.#downloadRow.querySelector(".blend-dl") as HTMLAnchorElement;
			if (blendLink) blendLink.href = this.#blendUrl;
		}
	}

	#escapeHtml(text: string): string {
		const div = document.createElement("div");
		div.textContent = text;
		return div.innerHTML;
	}

	override toJSON() {
		return {
			...super.toJSON(),
			type: "folk-blender",
			renderUrl: this.#renderUrl,
			script: this.#script,
			blendUrl: this.#blendUrl,
		};
	}
}