'use client';

import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Users, GraduationCap, Trophy, BookOpen } from "lucide-react";
import { useEffect, useState } from "react";
import { useTheme } from "next-themes";
import StatusMahasiswaChart from "@/components/StatusMahasiswaChart";
import StatistikMahasiswaChart from "@/components/StatistikMahasiswaChart";
import JenisPendaftaranChart from "@/components/JenisPendaftaranChart";
import AsalDaerahChart from "@/components/AsalDaerahChart";
import IPKChart from '@/components/IPKChart';

interface MahasiswaTotal {
  total_mahasiswa: number;
  mahasiswa_aktif: number;
  total_lulus: number;
  pria_lulus: number;
  wanita_lulus: number;
  total_berprestasi: number;
  prestasi_akademik: number;
  prestasi_non_akademik: number;
  ipk_rata_rata_aktif: number;
  ipk_rata_rata_lulus: number;
  total_mahasiswa_aktif_lulus: number;
}

// Skeleton loading component
const CardSkeleton = () => (
  <Card className="bg-white dark:bg-slate-900 shadow-lg">
    <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
      <div className="h-4 w-24 bg-gray-200 dark:bg-gray-700 rounded animate-pulse"></div>
      <div className="h-4 w-4 bg-gray-200 dark:bg-gray-700 rounded-full animate-pulse"></div>
    </CardHeader>
    <CardContent>
      <div className="h-8 w-16 bg-gray-200 dark:bg-gray-700 rounded animate-pulse mb-2"></div>
      <div className="flex justify-between">
        <div className="h-3 w-20 bg-gray-200 dark:bg-gray-700 rounded animate-pulse"></div>
        <div className="h-3 w-20 bg-gray-200 dark:bg-gray-700 rounded animate-pulse"></div>
      </div>
    </CardContent>
  </Card>
);

export default function HomePage() {
  const { theme } = useTheme();
  const [mahasiswaData, setMahasiswaData] = useState<MahasiswaTotal>({
    total_mahasiswa: 0,
    mahasiswa_aktif: 0,
    total_lulus: 0,
    pria_lulus: 0,
    wanita_lulus: 0,
    total_berprestasi: 0,
    prestasi_akademik: 0,
    prestasi_non_akademik: 0,
    ipk_rata_rata_aktif: 0,
    ipk_rata_rata_lulus: 0,
    total_mahasiswa_aktif_lulus: 0
  });
  
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const fetchData = async () => {
      try {
        // Menggunakan cache API untuk mempercepat loading
        const cacheKey = 'mahasiswa-total-data';
        const cachedData = sessionStorage.getItem(cacheKey);
        const cachedTimestamp = sessionStorage.getItem(`${cacheKey}-timestamp`);
        
        // Cek apakah data cache masih valid (kurang dari 60 detik)
        const isCacheValid = cachedTimestamp && 
          (Date.now() - parseInt(cachedTimestamp)) < 60000;
        
        if (cachedData && isCacheValid) {
          setMahasiswaData(JSON.parse(cachedData));
        }
        
        // Fetch data total mahasiswa
        const totalResponse = await fetch('/api/mahasiswa/total', {
          cache: 'no-store',
        });
        
        if (!totalResponse.ok) {
          throw new Error('Failed to fetch total data');
        }
        
        const totalData = await totalResponse.json();
        setMahasiswaData(totalData);
        
        // Menyimpan data dan timestamp ke sessionStorage
        sessionStorage.setItem(cacheKey, JSON.stringify(totalData));
        sessionStorage.setItem(`${cacheKey}-timestamp`, Date.now().toString());
      } catch (err) {
        setError(err instanceof Error ? err.message : 'An error occurred');
        console.error('Error fetching data:', err);
      } finally {
        setLoading(false);
      }
    };

    fetchData();
  }, []);

  return (
    <div className="container mx-auto p-4 space-y-6">
      <h1 className="text-3xl font-bold mb-8">Dashboard Portal Data Informatika</h1>
      
      {loading ? (
        <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-4">
          <CardSkeleton />
          <CardSkeleton />
          <CardSkeleton />
          <CardSkeleton />
        </div>
      ) : error ? (
        <div className="bg-red-50 border-l-4 border-red-500 p-4 mb-4">
          <div className="flex">
            <div className="flex-shrink-0">
              <svg className="h-5 w-5 text-red-500" viewBox="0 0 20 20" fill="currentColor">
                <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clipRule="evenodd" />
              </svg>
            </div>
            <div className="ml-3">
              <p className="text-sm text-red-700">{error}</p>
            </div>
          </div>
        </div>
      ) : (
        <>
          <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-4 mb-8">
            {/* Kartu Total Mahasiswa */}
            <Card className="bg-white dark:bg-slate-900 shadow-lg">
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium dark:text-white">
                  Total Mahasiswa
                </CardTitle>
                <Users className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold dark:text-white">{mahasiswaData.total_mahasiswa}</div>
                <div className="flex justify-between mt-2 text-xs text-muted-foreground">
                  <span className="dark:text-white">Aktif: <span className="text-green-500">{mahasiswaData.mahasiswa_aktif}</span></span>
                </div>
              </CardContent>
            </Card>

            {/* Kartu Total Kelulusan */}
            <Card className="bg-white dark:bg-slate-900 shadow-lg">
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium dark:text-white">
                  Total Kelulusan
                </CardTitle>
                <GraduationCap className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold dark:text-white">{mahasiswaData.total_lulus}</div>
                <div className="flex justify-between mt-2 text-xs text-muted-foreground">
                  <span className="dark:text-white">Laki-laki: <span className="text-blue-500">{mahasiswaData.pria_lulus}</span></span>
                  <span className="dark:text-white">Perempuan: <span className="text-pink-500">{mahasiswaData.wanita_lulus}</span></span>
                </div>
              </CardContent>
            </Card>

            {/* Kartu Total Prestasi */}
            <Card className="bg-white dark:bg-slate-900 shadow-lg">
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium dark:text-white">
                  Mahasiswa Berprestasi
                </CardTitle>
                <Trophy className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold dark:text-white">{mahasiswaData.total_berprestasi}</div>
                <div className="flex justify-between mt-2 text-xs text-muted-foreground">
                  <span className="dark:text-white">Akademik: <span className="text-yellow-500">{mahasiswaData.prestasi_akademik}</span></span>
                  <span className="dark:text-white">Non-Akademik: <span className="text-purple-500">{mahasiswaData.prestasi_non_akademik}</span></span>
                </div>
              </CardContent>
            </Card>

            {/* Kartu Rata-rata IPK */}
            <Card className="bg-white dark:bg-slate-900 shadow-lg">
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium dark:text-white">
                  Rata-rata IPK
                </CardTitle>
                <BookOpen className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold dark:text-white">{mahasiswaData.total_mahasiswa_aktif_lulus}</div>
                <div className="flex justify-between mt-2 text-xs text-muted-foreground">
                  <span className="dark:text-white">Aktif: <span className="text-green-500">{mahasiswaData.ipk_rata_rata_aktif}</span></span>
                  <span className="dark:text-white">Lulus: <span className="text-blue-500">{mahasiswaData.ipk_rata_rata_lulus}</span></span>
                </div>
              </CardContent>
            </Card>
          </div>

          {/* Diagram Statistik Mahasiswa */}
          <StatistikMahasiswaChart />

          {/* Diagram Status Mahasiswa */}
          <StatusMahasiswaChart />

          {/* Diagram Jenis Pendaftaran */}
          <JenisPendaftaranChart />

          {/* Diagram Asal Daerah */}
          <AsalDaerahChart />

          {/* Diagram IPK */}
          <IPKChart />
        </>
      )}
    </div>
  );
}