/**
 * rDesign module — collaborative DTP workspace via Scribus + noVNC.
 *
 * Embeds Scribus running in a Docker container with noVNC for browser access.
 * Includes a generative design agent powered by Gemini tool-calling.
 */

import { Hono } from "hono";
import { renderShell } from "../../server/shell";
import { getModuleInfoList } from "../../shared/module";
import type { RSpaceModule } from "../../shared/module";
import { designAgentRoutes } from "./design-agent-route";

const routes = new Hono();

const SCRIBUS_NOVNC_URL = process.env.SCRIBUS_NOVNC_URL || "https://design.rspace.online";
const SCRIBUS_BRIDGE_URL = process.env.SCRIBUS_BRIDGE_URL || "http://scribus-novnc:8765";

// Mount design agent API routes
routes.route("/", designAgentRoutes);

routes.get("/api/health", (c) => {
	return c.json({ ok: true, module: "rdesign" });
});

// Proxy bridge API calls from rspace to the Scribus container
routes.all("/api/bridge/*", async (c) => {
	const path = c.req.path.replace(/^.*\/api\/bridge/, "/api/scribus");
	const bridgeSecret = process.env.SCRIBUS_BRIDGE_SECRET || "";
	const headers: Record<string, string> = { "Content-Type": "application/json" };
	if (bridgeSecret) headers["X-Bridge-Secret"] = bridgeSecret;

	try {
		const url = `${SCRIBUS_BRIDGE_URL}${path}`;
		const res = await fetch(url, {
			method: c.req.method,
			headers,
			body: c.req.method !== "GET" ? await c.req.text() : undefined,
			signal: AbortSignal.timeout(30_000),
		});
		const data = await res.json();
		return c.json(data, res.status as any);
	} catch (e: any) {
		return c.json({ error: `Bridge proxy failed: ${e.message}` }, 502);
	}
});

routes.get("/", (c) => {
	const space = c.req.param("space") || "demo";
	const view = c.req.query("view");

	if (view === "demo") {
		return c.html(renderShell({
			title: `${space} — Design | rSpace`,
			moduleId: "rdesign",
			spaceSlug: space,
			modules: getModuleInfoList(),
			theme: "dark",
			body: renderDesignLanding(),
		}));
	}

	// Default: show the design agent UI (text-driven, no iframe)
	return c.html(renderShell({
		title: `${space} — rDesign | rSpace`,
		moduleId: "rdesign",
		spaceSlug: space,
		modules: getModuleInfoList(),
		theme: "dark",
		body: renderDesignApp(space, SCRIBUS_NOVNC_URL),
		styles: `<style>${RDESIGN_CSS}</style>`,
		scripts: `<script>${RDESIGN_JS}</script>`,
	}));
});

const RDESIGN_CSS = `
#rdesign-app { max-width:900px; margin:0 auto; padding:0.5rem 0; }
.rd-panel { background:var(--rs-bg-surface,#1e1e2e); border:1px solid var(--rs-border,#334155); border-radius:12px; overflow:hidden; }
.rd-prompt { padding:16px; border-bottom:1px solid var(--rs-border,#334155); }
.rd-prompt textarea { width:100%; padding:12px; border:2px solid var(--rs-border,#334155); border-radius:8px; font-size:14px; resize:none; outline:none; font-family:inherit; background:var(--rs-bg-elevated,#0f172a); color:var(--rs-text-primary,#e2e8f0); box-sizing:border-box; }
.rd-prompt textarea:focus { border-color:#7c3aed; }
.rd-prompt textarea::placeholder { color:#64748b; }
.rd-btn-row { display:flex; gap:8px; margin-top:10px; align-items:center; }
.rd-btn { padding:8px 18px; border-radius:8px; border:none; font-size:13px; font-weight:600; cursor:pointer; transition:all 0.15s; }
.rd-btn-primary { background:linear-gradient(135deg,#7c3aed,#a78bfa); color:white; }
.rd-btn-primary:hover { background:linear-gradient(135deg,#6d28d9,#8b5cf6); transform:translateY(-1px); }
.rd-btn-primary:disabled { opacity:0.5; cursor:default; transform:none; }
.rd-btn-secondary { background:var(--rs-bg-elevated,#1e293b); color:var(--rs-text-secondary,#94a3b8); border:1px solid var(--rs-border,#334155); }
.rd-btn-secondary:hover { background:var(--rs-bg-hover,#334155); color:var(--rs-text-primary,#e2e8f0); }
.rd-badge { font-size:10px; padding:3px 8px; border-radius:10px; text-transform:uppercase; letter-spacing:0.5px; background:rgba(124,58,237,0.2); color:#a78bfa; margin-left:auto; }
.rd-body { display:flex; min-height:400px; }
.rd-steps { flex:1; overflow-y:auto; padding:12px; font-size:12px; border-right:1px solid var(--rs-border,#334155); max-height:500px; }
.rd-preview { flex:1; display:flex; flex-direction:column; align-items:center; justify-content:center; padding:16px; min-width:300px; }
.rd-preview img { max-width:100%; max-height:400px; border-radius:8px; border:1px solid var(--rs-border,#334155); }
.rd-empty { color:#64748b; text-align:center; font-size:13px; padding:3rem 1rem; }
.rd-step { padding:6px 0; border-bottom:1px solid var(--rs-border,#1e293b); display:flex; align-items:flex-start; gap:8px; }
.rd-step-icon { flex-shrink:0; width:18px; height:18px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:10px; margin-top:1px; }
.rd-step-icon.thinking { background:#1e3a5f; color:#60a5fa; }
.rd-step-icon.executing { background:#422006; color:#fbbf24; }
.rd-step-icon.done { background:#064e3b; color:#34d399; }
.rd-step-icon.error { background:#450a0a; color:#f87171; }
.rd-step-content { flex:1; line-height:1.4; color:var(--rs-text-secondary,#94a3b8); }
.rd-step-tool { font-family:monospace; background:var(--rs-bg-elevated,#0f172a); padding:1px 4px; border-radius:3px; font-size:11px; color:#a78bfa; }
.rd-export { display:flex; gap:8px; padding:12px 16px; border-top:1px solid var(--rs-border,#334155); justify-content:center; }
.rd-spinner { display:inline-block; width:12px; height:12px; border:2px solid rgba(255,255,255,0.3); border-top-color:#fff; border-radius:50%; animation:rd-spin 0.8s linear infinite; vertical-align:middle; margin-right:4px; }
@keyframes rd-spin { to { transform:rotate(360deg); } }
@media (max-width:700px) {
	.rd-body { flex-direction:column; }
	.rd-steps { border-right:none; border-bottom:1px solid var(--rs-border,#334155); max-height:250px; }
}
`;

const RDESIGN_JS = `
(function() {
	var brief = document.getElementById('rdesign-brief');
	var generateBtn = document.getElementById('rdesign-generate');
	var stopBtn = document.getElementById('rdesign-stop');
	var badge = document.getElementById('rdesign-badge');
	var stepsEl = document.getElementById('rdesign-steps');
	var previewEl = document.getElementById('rdesign-preview');
	var exportRow = document.getElementById('rdesign-export');
	var refineBtn = document.getElementById('rdesign-refine');
	var abortController = null;
	var state = 'idle';
	if (!brief) return;

	function setState(s) {
		state = s;
		badge.textContent = s.charAt(0).toUpperCase() + s.slice(1);
		var working = s !== 'idle' && s !== 'done' && s !== 'error';
		generateBtn.disabled = working;
		generateBtn.innerHTML = working ? '<span class="rd-spinner"></span> Working...' : 'Generate Design';
		stopBtn.style.display = working ? '' : 'none';
		exportRow.style.display = s === 'done' ? '' : 'none';
		brief.disabled = working;
	}

	function addStep(icon, cls, text) {
		var ph = stepsEl.querySelector('.rd-empty');
		if (ph) ph.remove();
		var div = document.createElement('div');
		div.className = 'rd-step';
		div.innerHTML = '<div class="rd-step-icon ' + cls + '">' + icon + '</div><div class="rd-step-content">' + text + '</div>';
		stepsEl.appendChild(div);
		stepsEl.scrollTop = stepsEl.scrollHeight;
	}

	function processEvent(data) {
		switch (data.action) {
			case 'starting_scribus': addStep('~', 'thinking', data.status || 'Starting Scribus...'); break;
			case 'scribus_ready': addStep('\\u2713', 'done', 'Scribus ready'); break;
			case 'thinking': setState('planning'); addStep('~', 'thinking', data.status || 'Thinking...'); break;
			case 'executing':
				setState('executing');
				addStep('\\u25B6', 'executing', (data.status || 'Executing') + ': <span class="rd-step-tool">' + data.tool + '</span>');
				break;
			case 'tool_result':
				if (data.result && data.result.error) {
					addStep('!', 'error', data.tool + ' failed: ' + data.result.error);
				} else {
					addStep('\\u2713', 'done', data.tool + ' completed');
				}
				break;
			case 'verifying': setState('verifying'); addStep('~', 'thinking', data.status || 'Verifying...'); break;
			case 'complete': addStep('\\u2713', 'done', data.message || 'Design complete'); break;
			case 'done':
				addStep('\\u2713', 'done', data.status || 'Done!');
				if (data.state && data.state.frames) {
					addStep('\\u2713', 'done', data.state.frames.length + ' frame(s) in document');
				}
				if (data.state && data.state.frames && data.state.frames.length > 0) {
					renderLayoutPreview(data.state);
				}
				break;
			case 'error':
				addStep('!', 'error', data.error || 'Unknown error');
				setState('error');
				break;
		}
	}

	function renderLayoutPreview(docState) {
		var pages = docState.pages || [];
		var frames = docState.frames || [];
		var page = pages[0] || { width: 210, height: 297 };
		var maxW = 350, maxH = 400;
		var scale = Math.min(maxW / page.width, maxH / page.height);
		var pw = Math.round(page.width * scale);
		var pht = Math.round(page.height * scale);
		var svg = '<svg width="' + pw + '" height="' + pht + '" viewBox="0 0 ' + page.width + ' ' + page.height + '" style="background:white;border:1px solid #334155;border-radius:6px;box-shadow:0 4px 12px rgba(0,0,0,0.3)">';
		for (var i = 0; i < frames.length; i++) {
			var f = frames[i];
			var fx = f.x || 0, fy = f.y || 0, fw = f.width || 50, fh = f.height || 20;
			if (f.type === 'TextFrame' || f.type === 'text') {
				svg += '<rect x="'+fx+'" y="'+fy+'" width="'+fw+'" height="'+fh+'" fill="none" stroke="#7c3aed" stroke-width="0.5" stroke-dasharray="2,1" rx="1"/>';
				var fs = Math.min((f.fontSize || 12) * 0.35, fh * 0.7);
				var txt = (f.text || '').substring(0, 40).replace(/</g, '&lt;');
				svg += '<text x="'+(fx+2)+'" y="'+(fy+fs+1)+'" font-size="'+fs+'" fill="#334155" font-family="sans-serif">'+txt+'</text>';
			} else if (f.type === 'ImageFrame' || f.type === 'image') {
				svg += '<rect x="'+fx+'" y="'+fy+'" width="'+fw+'" height="'+fh+'" fill="#f1f5f9" stroke="#94a3b8" stroke-width="0.5" rx="1"/>';
				svg += '<text x="'+(fx+fw/2)+'" y="'+(fy+fh/2+2)+'" font-size="4" fill="#94a3b8" text-anchor="middle" font-family="sans-serif">IMAGE</text>';
			} else {
				svg += '<rect x="'+fx+'" y="'+fy+'" width="'+fw+'" height="'+fh+'" fill="'+(f.fill||'#e2e8f0')+'" stroke="#94a3b8" stroke-width="0.3" rx="1"/>';
			}
		}
		svg += '</svg>';
		previewEl.innerHTML = svg + '<div style="color:#64748b;font-size:11px;margin-top:8px">' + frames.length + ' frames on ' + page.width + '\\u00d7' + page.height + 'mm page</div>';
	}

	function generate() {
		var text = brief.value.trim();
		if (!text || (state !== 'idle' && state !== 'done' && state !== 'error')) return;
		stepsEl.innerHTML = '';
		previewEl.innerHTML = '<div class="rd-empty"><div style="font-size:2rem;margin-bottom:0.5rem">\\u{1f4d0}</div>Generating...</div>';
		setState('planning');
		abortController = new AbortController();
		var space = document.getElementById('rdesign-app').dataset.space || 'demo';
		fetch('/' + space + '/rdesign/api/design-agent', {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ brief: text, space: space }),
			signal: abortController.signal,
		}).then(function(res) {
			if (!res.ok || !res.body) { addStep('!', 'error', 'Request failed: ' + res.status); setState('error'); return; }
			var reader = res.body.getReader();
			var decoder = new TextDecoder();
			var buffer = '';
			function read() {
				reader.read().then(function(result) {
					if (result.done) { if (state !== 'error') setState('done'); abortController = null; return; }
					buffer += decoder.decode(result.value, { stream: true });
					var lines = buffer.split('\\n');
					buffer = lines.pop() || '';
					for (var j = 0; j < lines.length; j++) {
						if (lines[j].indexOf('data:') === 0) {
							try { processEvent(JSON.parse(lines[j].substring(5).trim())); } catch(e) {}
						}
					}
					read();
				});
			}
			read();
		}).catch(function(e) {
			if (e.name !== 'AbortError') { addStep('!', 'error', 'Error: ' + e.message); setState('error'); }
			abortController = null;
		});
	}

	generateBtn.addEventListener('click', generate);
	stopBtn.addEventListener('click', function() { if (abortController) abortController.abort(); setState('idle'); addStep('!', 'error', 'Stopped by user'); });
	brief.addEventListener('keydown', function(e) { if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); generate(); } });
	refineBtn.addEventListener('click', function() { brief.focus(); brief.select(); });
})();
`;

function renderDesignApp(space: string, novncUrl: string): string {
	return `<div id="rdesign-app" data-space="${space}">
	<div class="rd-panel">
		<div class="rd-prompt">
			<textarea id="rdesign-brief" rows="3" placeholder="e.g. Create an A4 event poster for 'Mushroom Festival 2026' with a bold title, date (June 14-15), location, and a large image area for a forest photo"></textarea>
			<div class="rd-btn-row">
				<button id="rdesign-generate" class="rd-btn rd-btn-primary">Generate Design</button>
				<button id="rdesign-stop" class="rd-btn rd-btn-secondary" style="display:none">Stop</button>
				<span id="rdesign-badge" class="rd-badge">Idle</span>
			</div>
		</div>
		<div class="rd-body">
			<div id="rdesign-steps" class="rd-steps">
				<div class="rd-empty">
					Enter a design brief above and click <strong>Generate Design</strong>.<br>
					The agent will create frames, text, and shapes in Scribus step by step.
				</div>
			</div>
			<div id="rdesign-preview" class="rd-preview">
				<div class="rd-empty">
					<div style="font-size:2rem;margin-bottom:0.5rem">&#x1f4d0;</div>
					Preview will appear here<br>after generation completes
				</div>
			</div>
		</div>
		<div id="rdesign-export" class="rd-export" style="display:none">
			<a class="rd-btn rd-btn-secondary" href="${novncUrl}" target="_blank" rel="noopener">Open Scribus (noVNC)</a>
			<button id="rdesign-refine" class="rd-btn rd-btn-secondary">Refine</button>
		</div>
	</div>
</div>`;
}

function renderDesignLanding(): string {
	return `<div style="max-width:640px;margin:0 auto;padding:3rem 1rem;text-align:center">
	<div style="font-size:3rem;margin-bottom:1rem">&#x1f3af;</div>
	<h2 style="font-size:1.5rem;margin-bottom:0.75rem;background:linear-gradient(135deg,#7c3aed,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent">rDesign</h2>
	<p style="color:#94a3b8;margin-bottom:1rem;line-height:1.6">AI-powered DTP workspace. Describe what you want and the design agent builds it in Scribus — posters, flyers, brochures, and print-ready documents.</p>
	<p style="color:#64748b;font-size:0.85rem;margin-bottom:2rem">Text in, design out. No mouse interaction needed.</p>
	<a href="?" class="rapp-nav__btn--app-toggle" style="display:inline-block;padding:10px 24px;font-size:0.9rem">Open rDesign</a>
</div>`;
}

export const designModule: RSpaceModule = {
	id: "rdesign",
	name: "rDesign",
	icon: "\u{1f3af}",
	description: "AI-powered DTP workspace — text in, design out",
	scoping: { defaultScope: 'global', userConfigurable: false },
	routes,
	landingPage: renderDesignLanding,
	feeds: [
		{ id: "design-assets", name: "Design Assets", kind: "resource", description: "Design files, layouts, and print-ready exports" },
	],
	acceptsFeeds: ["data", "resource"],
	outputPaths: [
		{ path: "designs", name: "Designs", icon: "\u{1f3af}", description: "Design files and layouts" },
		{ path: "templates", name: "Templates", icon: "\u{1f4d0}", description: "Reusable design templates" },
	],
};