/**
 * <folk-graph-viewer> — community relationship graph.
 *
 * Displays network nodes (people, companies, opportunities)
 * and edges in a force-directed layout with search and filtering.
 */

interface GraphNode {
	id: string;
	name: string;
	type: "person" | "company" | "opportunity";
	workspace: string;
}

class FolkGraphViewer extends HTMLElement {
	private shadow: ShadowRoot;
	private space = "";
	private workspaces: any[] = [];
	private info: any = null;
	private nodes: GraphNode[] = [];
	private filter: "all" | "person" | "company" | "opportunity" = "all";
	private searchQuery = "";
	private error = "";

	constructor() {
		super();
		this.shadow = this.attachShadow({ mode: "open" });
	}

	connectedCallback() {
		this.space = this.getAttribute("space") || "demo";
		if (this.space === "demo") { this.loadDemoData(); return; }
		this.loadData();
		this.render();
	}

	private loadDemoData() {
		this.info = { name: "rSpace Community", member_count: 42, company_count: 8, opportunity_count: 5 };

		this.workspaces = [
			{ name: "Core Contributors", slug: "core-contributors", nodeCount: 12, edgeCount: 3 },
			{ name: "Extended Network", slug: "extended-network", nodeCount: 30, edgeCount: 5 },
		];

		this.nodes = [
			{ id: "demo-p1", name: "Alice Chen", type: "person", workspace: "Core Contributors" },
			{ id: "demo-p2", name: "Bob Marley", type: "person", workspace: "Core Contributors" },
			{ id: "demo-p3", name: "Carol Danvers", type: "person", workspace: "Extended Network" },
			{ id: "demo-p4", name: "Diana Prince", type: "person", workspace: "Extended Network" },
			{ id: "demo-c1", name: "Radiant Hall Press", type: "company", workspace: "Core Contributors" },
			{ id: "demo-c2", name: "Tiny Splendor", type: "company", workspace: "Extended Network" },
			{ id: "demo-c3", name: "Commons Hub", type: "company", workspace: "Core Contributors" },
		];

		this.render();
	}

	private getApiBase(): string {
		const path = window.location.pathname;
		const match = path.match(/^\/([^/]+)\/network/);
		return match ? `/${match[1]}/network` : "";
	}

	private async loadData() {
		const base = this.getApiBase();
		try {
			const [wsRes, infoRes] = await Promise.all([
				fetch(`${base}/api/workspaces`),
				fetch(`${base}/api/info`),
			]);
			if (wsRes.ok) this.workspaces = await wsRes.json();
			if (infoRes.ok) this.info = await infoRes.json();
		} catch { /* offline */ }
		this.render();
	}

	private getFilteredNodes(): GraphNode[] {
		let filtered = this.nodes;
		if (this.filter !== "all") {
			filtered = filtered.filter(n => n.type === this.filter);
		}
		if (this.searchQuery.trim()) {
			const q = this.searchQuery.toLowerCase();
			filtered = filtered.filter(n =>
				n.name.toLowerCase().includes(q) ||
				n.workspace.toLowerCase().includes(q)
			);
		}
		return filtered;
	}

	private renderGraphNodes(): string {
		const filtered = this.getFilteredNodes();
		if (filtered.length === 0 && this.nodes.length > 0) {
			return `<div class="placeholder"><p style="font-size:14px;color:#888">No nodes match current filter.</p></div>`;
		}
		if (filtered.length === 0) {
			return `
				<div class="placeholder">
					<p style="font-size:48px">&#x1F578;&#xFE0F;</p>
					<p style="font-size:16px">Community Relationship Graph</p>
					<p>Connect the force-directed layout engine to visualize your network.</p>
					<p style="font-size:12px;color:#444">Automerge CRDT sync + d3-force layout</p>
				</div>
			`;
		}

		// Render demo nodes as positioned circles inside the graph canvas
		const cx = 250;
		const cy = 250;
		const r = 180;
		const nodesSvg = filtered.map((node, i) => {
			const angle = (2 * Math.PI * i) / filtered.length - Math.PI / 2;
			const x = cx + r * Math.cos(angle);
			const y = cy + r * Math.sin(angle);
			const color = node.type === "person" ? "#3b82f6" : node.type === "company" ? "#22c55e" : "#f59e0b";
			const radius = node.type === "company" ? 18 : 14;
			return `
				<circle cx="${x}" cy="${y}" r="${radius}" fill="${color}" opacity="0.8"/>
				<text x="${x}" y="${y + radius + 14}" fill="#aaa" font-size="10" text-anchor="middle">${this.esc(node.name)}</text>
			`;
		}).join("");

		// Draw edges between nodes in the same workspace
		const edgesSvg: string[] = [];
		for (let i = 0; i < filtered.length; i++) {
			for (let j = i + 1; j < filtered.length; j++) {
				if (filtered[i].workspace === filtered[j].workspace) {
					const a1 = (2 * Math.PI * i) / filtered.length - Math.PI / 2;
					const a2 = (2 * Math.PI * j) / filtered.length - Math.PI / 2;
					const x1 = cx + r * Math.cos(a1);
					const y1 = cy + r * Math.sin(a1);
					const x2 = cx + r * Math.cos(a2);
					const y2 = cy + r * Math.sin(a2);
					edgesSvg.push(`<line x1="${x1}" y1="${y1}" x2="${x2}" y2="${y2}" stroke="#333" stroke-width="1" opacity="0.4"/>`);
				}
			}
		}

		return `<svg viewBox="0 0 500 500" width="100%" height="100%" style="max-height:500px">${edgesSvg.join("")}${nodesSvg}</svg>`;
	}

	private render() {
		this.shadow.innerHTML = `
		<style>
			:host { display: block; font-family: system-ui, -apple-system, sans-serif; color: #e0e0e0; }
			* { box-sizing: border-box; }

			.rapp-nav { display: flex; gap: 8px; margin-bottom: 16px; align-items: center; min-height: 36px; }
			.rapp-nav__title { font-size: 15px; font-weight: 600; flex: 1; color: #e2e8f0; }

			.toolbar { display: flex; gap: 8px; margin-bottom: 16px; align-items: center; flex-wrap: wrap; }
			.search-input {
				border: 1px solid #333; border-radius: 8px; padding: 8px 12px;
				background: #16161e; color: #e0e0e0; font-size: 13px; width: 200px; outline: none;
			}
			.search-input:focus { border-color: #6366f1; }
			.filter-btn {
				padding: 6px 12px; border-radius: 8px; border: 1px solid #333;
				background: #16161e; color: #888; cursor: pointer; font-size: 12px;
			}
			.filter-btn:hover { border-color: #555; }
			.filter-btn.active { border-color: #6366f1; color: #6366f1; }

			.graph-canvas {
				width: 100%; height: 500px; border-radius: 12px;
				background: #0d0d14; border: 1px solid #222;
				display: flex; align-items: center; justify-content: center;
				position: relative; overflow: hidden;
			}
			.placeholder { text-align: center; color: #555; padding: 40px; }
			.placeholder p { margin: 6px 0; }

			.workspace-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; margin-top: 16px; }
			.ws-card {
				background: #1e1e2e; border: 1px solid #333; border-radius: 10px;
				padding: 16px; cursor: pointer; transition: border-color 0.2s;
			}
			.ws-card:hover { border-color: #555; }
			.ws-name { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
			.ws-meta { font-size: 12px; color: #888; }

			.legend { display: flex; gap: 16px; margin-top: 12px; }
			.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: #888; }
			.legend-dot { width: 10px; height: 10px; border-radius: 50%; }
			.dot-person { background: #3b82f6; }
			.dot-company { background: #22c55e; }
			.dot-opportunity { background: #f59e0b; }

			.stats { display: flex; gap: 20px; margin-bottom: 16px; }
			.stat { text-align: center; }
			.stat-value { font-size: 24px; font-weight: 700; color: #6366f1; }
			.stat-label { font-size: 11px; color: #888; }

			.demo-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; background: #f59e0b22; color: #f59e0b; font-size: 11px; font-weight: 600; margin-left: 8px; }

			@media (max-width: 768px) {
				.graph-canvas { height: 350px; }
				.workspace-list { grid-template-columns: 1fr; }
				.stats { flex-wrap: wrap; gap: 12px; }
				.toolbar { flex-direction: column; align-items: stretch; }
				.search-input { width: 100%; }
			}
		</style>

		${this.error ? `<div style="color:#ef5350;text-align:center;padding:8px">${this.esc(this.error)}</div>` : ""}

		<div class="rapp-nav">
			<span class="rapp-nav__title">Network Graph${this.space === "demo" ? '<span class="demo-badge">Demo</span>' : ""}</span>
		</div>

		${this.info ? `
			<div class="stats">
				<div class="stat"><div class="stat-value">${this.info.member_count || 0}</div><div class="stat-label">Members</div></div>
				<div class="stat"><div class="stat-value">${this.info.company_count || 0}</div><div class="stat-label">Companies</div></div>
				<div class="stat"><div class="stat-value">${this.info.opportunity_count || 0}</div><div class="stat-label">Opportunities</div></div>
			</div>
		` : ""}

		<div class="toolbar">
			<input class="search-input" type="text" placeholder="Search nodes..." id="search-input" value="${this.esc(this.searchQuery)}">
			${(["all", "person", "company", "opportunity"] as const).map(f =>
				`<button class="filter-btn ${this.filter === f ? "active" : ""}" data-filter="${f}">${f === "all" ? "All" : f.charAt(0).toUpperCase() + f.slice(1)}s</button>`
			).join("")}
		</div>

		<div class="graph-canvas">
			${this.nodes.length > 0 ? this.renderGraphNodes() : `
			<div class="placeholder">
				<p style="font-size:48px">&#x1F578;&#xFE0F;</p>
				<p style="font-size:16px">Community Relationship Graph</p>
				<p>Connect the force-directed layout engine to visualize your network.</p>
				<p style="font-size:12px;color:#444">Automerge CRDT sync + d3-force layout</p>
			</div>
			`}
		</div>

		<div class="legend">
			<div class="legend-item"><span class="legend-dot dot-person"></span> People</div>
			<div class="legend-item"><span class="legend-dot dot-company"></span> Companies</div>
			<div class="legend-item"><span class="legend-dot dot-opportunity"></span> Opportunities</div>
		</div>

		${this.workspaces.length > 0 ? `
			<div style="margin-top:20px;font-size:14px;font-weight:600;color:#aaa">Workspaces</div>
			<div class="workspace-list">
				${this.workspaces.map(ws => `
					<div class="ws-card">
						<div class="ws-name">${this.esc(ws.name || ws.slug)}</div>
						<div class="ws-meta">${ws.nodeCount || 0} nodes &middot; ${ws.edgeCount || 0} edges</div>
					</div>
				`).join("")}
			</div>
		` : ""}
		`;
		this.attachListeners();
	}

	private attachListeners() {
		this.shadow.querySelectorAll("[data-filter]").forEach(el => {
			el.addEventListener("click", () => {
				this.filter = (el as HTMLElement).dataset.filter as any;
				this.render();
			});
		});
		let searchTimeout: any;
		this.shadow.getElementById("search-input")?.addEventListener("input", (e) => {
			this.searchQuery = (e.target as HTMLInputElement).value;
			clearTimeout(searchTimeout);
			searchTimeout = setTimeout(() => this.render(), 200);
		});
	}

	private esc(s: string): string {
		const d = document.createElement("div");
		d.textContent = s || "";
		return d.innerHTML;
	}
}

customElements.define("folk-graph-viewer", FolkGraphViewer);