"use client";

import {
  ReactFlow,
  Background,
  type Node,
  type Edge,
  type NodeProps,
  Handle,
  Position,
} from "@xyflow/react";
import "@xyflow/react/dist/style.css";
import { Globe, Server, Database, Wifi } from "lucide-react";

type ServiceNodeData = {
  label: string;
  subtitle: string;
  icon: React.ElementType;
  color: string;
  items?: string[];
};

function ServiceNode({ data }: NodeProps<Node<ServiceNodeData>>) {
  const Icon = data.icon;
  return (
    <div
      className="rounded-lg border bg-card px-5 py-4 shadow-sm"
      style={{ minWidth: 200 }}
    >
      <Handle type="target" position={Position.Top} className="opacity-0" />
      <Handle type="source" position={Position.Bottom} className="opacity-0" />
      <Handle
        type="source"
        position={Position.Right}
        id="right"
        className="opacity-0"
      />
      <Handle
        type="target"
        position={Position.Left}
        id="left"
        className="opacity-0"
      />
      <div className="flex items-center gap-2.5">
        <div
          className="flex size-8 items-center justify-center rounded-md"
          style={{ backgroundColor: data.color }}
        >
          <Icon className="size-4 text-white" />
        </div>
        <div>
          <div className="text-sm font-semibold text-foreground">
            {data.label}
          </div>
          <div className="text-xs text-muted-foreground">{data.subtitle}</div>
        </div>
      </div>
      {data.items && (
        <ul className="mt-3 space-y-1 border-t pt-3">
          {data.items.map((item) => (
            <li
              key={item}
              className="flex items-center gap-1.5 text-[11px] text-muted-foreground"
            >
              <span
                className="size-1 shrink-0 rounded-full"
                style={{ backgroundColor: data.color }}
              />
              {item}
            </li>
          ))}
        </ul>
      )}
    </div>
  );
}

const nodeTypes = { service: ServiceNode };

const nodes: Node<ServiceNodeData>[] = [
  {
    id: "nextjs",
    type: "service",
    position: { x: 0, y: 0 },
    data: {
      label: "Next.js",
      subtitle: "Vercel (Frontend)",
      icon: Globe,
      color: "#3b82f6",
      items: ["UI / SSR", "Auth (Supabase)", "WHOIS lookups", "Static pages"],
    },
  },
  {
    id: "go",
    type: "service",
    position: { x: 350, y: 0 },
    data: {
      label: "Go DNS API",
      subtitle: "VPS (Microservice)",
      icon: Server,
      color: "#10b981",
      items: [
        "DNS resolution (miekg/dns)",
        "DNSSEC validation",
        "Propagation checks",
        "Monitoring cron",
      ],
    },
  },
  {
    id: "supabase",
    type: "service",
    position: { x: 0, y: 230 },
    data: {
      label: "Supabase",
      subtitle: "Database & Auth",
      icon: Database,
      color: "#8b5cf6",
      items: ["Postgres DB", "Auth (OAuth + email)", "Row Level Security"],
    },
  },
  {
    id: "dns",
    type: "service",
    position: { x: 350, y: 230 },
    data: {
      label: "DNS Resolvers",
      subtitle: "Authoritative NS",
      icon: Wifi,
      color: "#f59e0b",
      items: ["Google (8.8.8.8)", "Cloudflare (1.1.1.1)", "Authoritative NS"],
    },
  },
];

const edges: Edge[] = [
  {
    id: "nextjs-go",
    source: "nextjs",
    target: "go",
    sourceHandle: "right",
    targetHandle: "left",
    label: "HTTPS",
    animated: true,
    style: { stroke: "#3b82f6" },
    labelStyle: { fontSize: 15, fill: "#94a3b8", fontWeight: "bold" },
    labelBgStyle: { fill: "transparent" },
  },
  {
    id: "nextjs-supabase",
    source: "nextjs",
    target: "supabase",
    label: "SDK",
    style: { stroke: "#8b5cf6" },
    labelStyle: { fontSize: 15, fill: "#94a3b8", fontWeight: "bold" },
    labelBgStyle: { fill: "transparent" },
  },
  {
    id: "go-dns",
    source: "go",
    target: "dns",
    label: "UDP/TCP",
    animated: true,
    style: { stroke: "#10b981" },
    labelStyle: { fontSize: 15, fill: "#94a3b8", fontWeight: "bold" },
    labelBgStyle: { fill: "transparent" },
  },
];

export function ArchitectureDiagram() {
  return (
    <div className="h-105 w-full rounded-lg border bg-background">
      <ReactFlow
        nodes={nodes}
        edges={edges}
        nodeTypes={nodeTypes}
        fitView
        fitViewOptions={{ padding: 0.3 }}
        proOptions={{ hideAttribution: true }}
        nodesDraggable={false}
        nodesConnectable={false}
        elementsSelectable={false}
        panOnDrag={false}
        zoomOnScroll={false}
        zoomOnPinch={false}
        zoomOnDoubleClick={false}
        preventScrolling={false}
      >
        <Background gap={20} size={1} className="opacity-30" />
      </ReactFlow>
    </div>
  );
}