"use client";

import { useState, useEffect } from "react";
import { Activity, Power, ZapOff, Zap, AlertTriangle, Lightbulb, Wind, Projector } from "lucide-react";

export default function PowerMonitoringPage() {
  // =========================================================================
  // 1. DEKLARASI STATE
  // =========================================================================
  const [rooms, setRooms] = useState<any[]>([]);
  const [roomDeviceStatus, setRoomDeviceStatus] = useState<{ [roomId: string]: { [deviceName: string]: boolean } }>({});
  
  // State khusus untuk menampung rincian 3 MCB di D101
  const [powerDataD101, setPowerDataD101] = useState({ umum: 0, ac1: 0, ac2: 0 });

  // =========================================================================
  // 2. FUNGSI FETCH DATA DARI BACKEND
  // =========================================================================
  
  // A. Tarik Data Daya (Power / Watt)
  const fetchPowerStatus = async () => {
    try {
      const response = await fetch("http://172.17.172.17:8080/api/hardware/power-status");
      if (response.ok) {
        const data = await response.json();
        
        const umum = parseFloat(data.umum) || 0;
        const ac1 = parseFloat(data.ac1) || 0;
        const ac2 = parseFloat(data.ac2) || 0;
        const totalD101 = umum + ac1 + ac2;

        setPowerDataD101({ umum, ac1, ac2 });

        // Update nilai power D101 di dalam array rooms
        setRooms(prev => prev.map(room => 
          room.name === "Kelas D101" ? { ...room, power: totalD101, lastUpdate: "Real-time" } : room
        ));
      }
    } catch (err) {
      console.error("Gagal mengambil data daya:", err);
    }
  };

  // B. Tarik Data Status Perangkat (Sinkronisasi Real-time)
  const fetchDeviceStatus = async () => {
    try {
      const response = await fetch("http://172.17.172.17:8080/api/hardware/status");
      const result = await response.json();
      
      if (result.status === "success") {
        const backendData = result.data;
        
        setRoomDeviceStatus(prev => ({
          ...prev,
          "room_1": { // room_1 diasumsikan sebagai D101
            ...prev["room_1"],
            "Lampu 1": backendData.lampu1 === "on",
            "Lampu 2": backendData.lampu2 === "on",
            "AC": backendData.ac === "on",
            "Proyektor": backendData.projector === "on",
          }
        }));
      }
    } catch (err) {
      console.error("Gagal sinkronisasi status perangkat:", err);
    }
  };

  // =========================================================================
  // 3. INISIALISASI & POLLING (AUTO-REFRESH)
  // =========================================================================
  useEffect(() => {
    // Simulasi Data Ruangan
    const dummyRooms = [
      { id: 1, name: "Kelas D101", power: 0, isRelayOn: true, lastUpdate: "Menunggu..." },
      { id: 2, name: "Kelas D102", power: 0, isRelayOn: false, lastUpdate: "2 mnt lalu" },
      { id: 3, name: "Kelas D103", power: 45, isRelayOn: true, lastUpdate: "Baru saja" },
      { id: 4, name: "Kelas D104", power: 0, isRelayOn: false, lastUpdate: "10 mnt lalu" },
    ];
    setRooms(dummyRooms);

    // Inisialisasi status default semua device OFF
    const initialStatus: { [roomId: string]: { [deviceName: string]: boolean } } = {};
    dummyRooms.forEach(room => {
      initialStatus[`room_${room.id}`] = {
        "Lampu 1": false,
        "Lampu 2": false,
        "AC": false,
        "Proyektor": false,
      };
    });
    setRoomDeviceStatus(initialStatus);

    fetchPowerStatus();
    fetchDeviceStatus();

    const interval = setInterval(() => {
      fetchPowerStatus();
      fetchDeviceStatus();
    }, 3000); // Polling 3 detik
    
    return () => clearInterval(interval);
  }, []);

  // =========================================================================
  // 4. FUNGSI KONTROL DEVICE & CUT OFF
  // =========================================================================
  const handleDeviceToggle = async (roomId: number, roomName: string, deviceName: string) => {
    const roomIdKey = `room_${roomId}`;
    const currentStatus = roomDeviceStatus[roomIdKey]?.[deviceName] || false;
    const actionType = currentStatus ? "off" : "on";

    if (currentStatus) {
      const confirmMsg = `Apakah Anda yakin ingin mematikan ${deviceName} di ${roomName}?`;
      if (!window.confirm(confirmMsg)) return; 
    }

    // Jika yang ditekan bukan D101, ubah UI saja (simulasi)
    if (roomName !== "Kelas D101") {
      setRoomDeviceStatus(prev => ({ ...prev, [roomIdKey]: { ...prev[roomIdKey], [deviceName]: !currentStatus } }));
      return;
    }

    // Logika khusus D101 (Tembak ke Golang)
    let backendDevice = "";
    if (deviceName === 'AC') backendDevice = "ac";
    else if (deviceName === 'Proyektor') backendDevice = "projector";
    else if (deviceName === 'Lampu 1') backendDevice = "lampu1";
    else if (deviceName === 'Lampu 2') backendDevice = "lampu2";

    setRoomDeviceStatus(prev => ({ ...prev, [roomIdKey]: { ...prev[roomIdKey], [deviceName]: !currentStatus } }));

    try {
      const response = await fetch("http://172.17.172.17:8080/api/hardware/control", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ device: backendDevice, action: actionType }),
      });

      if (!response.ok) {
        setRoomDeviceStatus(prev => ({ ...prev, [roomIdKey]: { ...prev[roomIdKey], [deviceName]: currentStatus } }));
        alert("Gagal mengontrol perangkat.");
      }
    } catch (error) {
      setRoomDeviceStatus(prev => ({ ...prev, [roomIdKey]: { ...prev[roomIdKey], [deviceName]: currentStatus } }));
      alert("GAGAL: Tidak dapat terhubung ke Server Golang.");
    }
  };

  // FUNGSI GLOBAL POWER (ON/OFF KHUSUS D101)
  const handleGlobalPower = async (roomName: string, roomId: number, currentRelayStatus: boolean) => {
    if (roomName === "Kelas D101") {
      const actionType = currentRelayStatus ? "off" : "on";
      const confirmMessage = currentRelayStatus 
        ? `PERINGATAN FATAL: Anda yakin ingin MEMUTUS 3 MCB Daya di ${roomName}? (Proses berurutan ~3 detik)`
        : `RESTORE POWER: Anda yakin ingin MENYALAKAN KEMBALI 3 MCB Daya di ${roomName}? (Proses berurutan ~3 detik)`;

      if (!window.confirm(confirmMessage)) return;
      
      // Ubah UI seketika
      setRooms(prev => prev.map(r => r.name === roomName ? { ...r, isRelayOn: !currentRelayStatus } : r));

      try {
        const response = await fetch("http://172.17.172.17:8080/api/power/global", { 
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ action: actionType }),
        });

        if (response.ok) {
          alert(`Daya di ${roomName} berhasil di-${actionType.toUpperCase()}!`);
          fetchPowerStatus();
          fetchDeviceStatus();
        } else {
          // Rollback UI jika gagal
          setRooms(prev => prev.map(r => r.name === roomName ? { ...r, isRelayOn: currentRelayStatus } : r));
          alert("Gagal mengontrol MCB utama. Cek koneksi server.");
        }
      } catch (error) {
        setRooms(prev => prev.map(r => r.name === roomName ? { ...r, isRelayOn: currentRelayStatus } : r));
        alert("Terjadi kesalahan jaringan saat menghubungi server.");
      }
    } else {
      // Dummy untuk kelas lain
      const actionType = currentRelayStatus ? "Mematikan" : "Menyalakan";
      if (window.confirm(`Simulasi ${actionType} daya di ${roomName}?`)) {
        setRooms(prev => prev.map(r => r.name === roomName ? { ...r, isRelayOn: !currentRelayStatus, power: 0 } : r));
      }
    }
  };

  // =========================================================================
  // 5. TAMPILAN UI (RENDER)
  // =========================================================================
  return (
    <div className="space-y-6">
      <div className="flex items-center gap-3 mb-6">
        <div className="bg-blue-100 p-3 rounded-lg text-blue-600">
          <Activity size={28} />
        </div>
        <div>
          <h2 className="text-2xl font-bold text-gray-800">Power Monitoring & Control</h2>
          <p className="text-gray-500 text-sm mt-1">Pantau konsumsi daya kWh meter dan kendalikan relay sirkuit ruangan.</p>
        </div>
      </div>

      <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-6">
        {[...rooms].sort((a, b) => a.name.localeCompare(b.name)).map((room) => {
          
          const roomIdKey = `room_${room.id}`;
          const currentRoomStatus = roomDeviceStatus[roomIdKey] || {};

          return (
            <div key={room.id} className={`bg-white p-6 rounded-xl border-2 shadow-sm relative overflow-hidden flex flex-col transition-all
              ${room.name === "Kelas D101" ? "border-blue-300" : "border-gray-100"}`}>
              
              <div className={`absolute top-0 right-0 px-4 py-1.5 text-[10px] font-black uppercase tracking-wider rounded-bl-xl
                ${room.isRelayOn ? 'bg-green-100 text-green-700' : 'bg-red-100 text-red-700'}`}>
                {room.isRelayOn ? 'Sirkuit Aktif' : 'Sirkuit Terputus'}
              </div>

              <h3 className="text-lg font-bold text-gray-800 mb-1">{room.name}</h3>
              {room.name === "Kelas D101" && <p className="text-[10px] text-blue-500 font-bold mb-3">(Live Connected API)</p>}
              {room.name !== "Kelas D101" && <p className="text-[10px] text-gray-400 font-bold mb-3">(Simulasi / Offline)</p>}
              
              <div className="flex items-end gap-2 mb-2">
                <span className={`text-5xl font-black tracking-tight ${room.power > 3000 ? 'text-red-500' : room.power > 1000 ? 'text-orange-500' : 'text-gray-800'}`}>
                  {typeof room.power === 'number' ? room.power.toFixed(1) : room.power}
                </span>
                <span className="text-gray-500 font-bold mb-1.5">Watts</span>
              </div>

              {/* RINCIAN KHUSUS D101 */}
              {room.name === "Kelas D101" && (
                <div className="bg-gray-50 p-2 rounded-lg flex justify-between text-[10px] text-gray-600 font-medium mb-4 border border-gray-100">
                  <span>Umum: <b className="text-gray-800">{powerDataD101.umum.toFixed(0)}W</b></span>
                  <span>AC1: <b className="text-gray-800">{powerDataD101.ac1.toFixed(0)}W</b></span>
                  <span>AC2: <b className="text-gray-800">{powerDataD101.ac2.toFixed(0)}W</b></span>
                </div>
              )}
              {room.name !== "Kelas D101" && <div className="mb-4 h-8"></div>}

              {room.power > 3000 && (
                <div className="flex items-center gap-2 text-xs font-bold text-red-600 bg-red-50 p-2 rounded-lg mb-4">
                  <AlertTriangle size={14} /> Batas Daya Terlampaui!
                </div>
              )}

              <div className="mt-auto pt-4 border-t border-gray-100">
                <p className="text-[10px] font-bold text-gray-400 uppercase tracking-wider mb-3">IoT Device Control</p>
                <div className="grid grid-cols-2 gap-2">
                  
                  <button 
                    onClick={() => handleDeviceToggle(room.id, room.name, 'Lampu 1')} 
                    disabled={!room.isRelayOn}
                    className={`flex justify-center items-center gap-2 p-2 rounded-lg text-xs font-bold transition-all
                      ${currentRoomStatus['Lampu 1'] ? 'bg-yellow-100 text-yellow-600 border border-yellow-200' : 'bg-gray-50 text-gray-400 border border-transparent'}`}
                  >
                    <Lightbulb size={14} className={currentRoomStatus['Lampu 1'] ? "fill-yellow-500" : ""} /> Lampu 1
                  </button>

                  <button 
                    onClick={() => handleDeviceToggle(room.id, room.name, 'Lampu 2')} 
                    disabled={!room.isRelayOn}
                    className={`flex justify-center items-center gap-2 p-2 rounded-lg text-xs font-bold transition-all
                      ${currentRoomStatus['Lampu 2'] ? 'bg-yellow-100 text-yellow-600 border border-yellow-200' : 'bg-gray-50 text-gray-400 border border-transparent'}`}
                  >
                    <Lightbulb size={14} className={currentRoomStatus['Lampu 2'] ? "fill-yellow-500" : ""} /> Lampu 2
                  </button>

                  <button 
                    onClick={() => handleDeviceToggle(room.id, room.name, 'AC')} 
                    disabled={!room.isRelayOn}
                    className={`flex justify-center items-center gap-2 p-2 rounded-lg text-xs font-bold transition-all
                      ${currentRoomStatus['AC'] ? 'bg-blue-100 text-blue-600 border border-blue-200' : 'bg-gray-50 text-gray-400 border border-transparent'}`}
                  >
                    <Wind size={14} className={currentRoomStatus['AC'] ? "animate-pulse" : ""} /> AC
                  </button>

                  <button 
                    onClick={() => handleDeviceToggle(room.id, room.name, 'Proyektor')} 
                    disabled={!room.isRelayOn}
                    className={`flex justify-center items-center gap-2 p-2 rounded-lg text-xs font-bold transition-all
                      ${currentRoomStatus['Proyektor'] ? 'bg-purple-100 text-purple-600 border border-purple-200' : 'bg-gray-50 text-gray-400 border border-transparent'}`}
                  >
                    <Projector size={14} className={currentRoomStatus['Proyektor'] ? "fill-purple-500" : ""} /> Proyektor
                  </button>

                </div>
              </div>

              <div className="flex items-center justify-between mt-6 pt-4 border-t border-gray-100">
                <span className="text-xs text-gray-400 font-medium">Update: {room.lastUpdate}</span>
                <button 
                  onClick={() => handleGlobalPower(room.name, room.id, room.isRelayOn)}
                  className={`flex items-center gap-2 px-4 py-2 rounded-lg text-xs font-bold transition-all
                    ${room.isRelayOn 
                      ? 'bg-red-50 text-red-600 hover:bg-red-600 hover:text-white border border-red-200 hover:border-red-600' 
                      : 'bg-green-50 text-green-600 hover:bg-green-600 hover:text-white border border-green-200 hover:border-green-600'}`}
                >
                  {room.isRelayOn ? <><Power size={14} /> Cut Off Power</> : <><Zap size={14} /> Restore Power</>}
                </button>
              </div>
            </div>
          );
        })}
      </div>
    </div>
  );
}