'use client';

import { useEffect, useState } from 'react';
import dynamic from 'next/dynamic';
import { ApexOptions } from 'apexcharts';
import { useTheme } from 'next-themes';
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { ExternalLink } from "lucide-react";
import Link from "next/link";

const Chart = dynamic(() => import('react-apexcharts'), { ssr: false });

interface MasaStudiAktifData {
  tahun_angkatan: number;
  rata_rata_masa_studi_aktif_tahun: number;
  rata_rata_masa_studi_lulus_tahun: number;
}

interface Props {
  selectedYear: string;
}

interface MasaStudiLulusChartProps extends Props {
  height?: string;
  showDetailButton?: boolean;
}

export default function MasaStudiLulusChart({ 
  selectedYear, 
  height = "h-[300px] sm:h-[350px] md:h-[300px]",
  showDetailButton = true 
}: MasaStudiLulusChartProps) {
  const { theme } = useTheme();
  const [mounted, setMounted] = useState(false);
  const [data, setData] = useState<MasaStudiAktifData[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    setMounted(true);
  }, []);

  useEffect(() => {
    const fetchData = async () => {
      try {
        setLoading(true);
        setError(null);
        let url = '/api/mahasiswa/masa-studi-aktif';
        if (selectedYear && selectedYear !== 'all') {
          url += `?tahun_angkatan=${selectedYear}`;
        }
        const response = await fetch(url);
        if (!response.ok) {
          throw new Error(`Failed to fetch data: ${response.status} ${response.statusText}`);
        }
        const result = await response.json();
        if (!Array.isArray(result)) {
          throw new Error('Invalid data format received from server');
        }
        // Sort data by tahun_angkatan
        const sortedData = result.sort((a: MasaStudiAktifData, b: MasaStudiAktifData) => a.tahun_angkatan - b.tahun_angkatan);
        setData(sortedData);
      } catch (err) {
        setError(err instanceof Error ? err.message : 'An error occurred while fetching data');
      } finally {
        setLoading(false);
      }
    };
    fetchData();
  }, [selectedYear]);

  // Chart options and series
  const chartOptions: ApexOptions = {
    chart: {
      type: selectedYear === 'all' ? 'line' : 'bar',
      toolbar: {
        show: true,
        tools: {
          download: true,
          selection: true,
          zoom: true,
          zoomin: true,
          zoomout: true,
          pan: true,
          reset: true
        }
      },
      background: theme === 'dark' ? '#0F172B' : '#fff',
      zoom: {
        enabled: true,
        type: 'x',
        autoScaleYaxis: true
      }
    },
    plotOptions: {
      bar: {
        horizontal: false,
        columnWidth: '55%',
        borderRadius: 4,
      },
    },
    stroke: {
      curve: 'straight',
      width: 3,
      lineCap: 'round'
    },
    markers: {
      size: 5,
      strokeWidth: 2,
      strokeColors: theme === 'dark' ? ['#fff'] : ['#3B82F6'],
      colors: ['#3B82F6'],
      hover: {
        size: 7
      }
    },
    dataLabels: {
      enabled: true,
      formatter: function (val: number) {
        return val.toFixed(1);
      },
      style: {
        fontSize: '14px',
        fontWeight: 'bold',
        colors: [theme === 'dark' ? '#fff' : '#000']
      },
      background: {
        enabled: false
      },
      offsetY: -10
    },
    xaxis: {
      categories: data.map(item => item.tahun_angkatan.toString()),
      title: {
        text: 'Tahun Angkatan',
        style: {
          fontSize: '14px',
          fontWeight: 'bold',
          color: theme === 'dark' ? '#fff' : '#000'
        }
      },
      labels: {
        style: {
          fontSize: '12px',
          colors: theme === 'dark' ? '#fff' : '#000'
        }
      },
      axisBorder: {
        show: true,
        color: theme === 'dark' ? '#374151' : '#E5E7EB'
      },
      axisTicks: {
        show: true,
        color: theme === 'dark' ? '#374151' : '#E5E7EB'
      }
    },
    yaxis: {
      title: {
        text: 'Rata-rata Masa Studi (tahun)',
        style: {
          fontSize: '14px',
          fontWeight: 'bold',
          color: theme === 'dark' ? '#fff' : '#000'
        }
      },
      min: 0,
      max: 8,
      labels: {
        style: {
          fontSize: '12px',
          colors: theme === 'dark' ? '#fff' : '#000'
        },
        formatter: function (val: number) {
          return val.toFixed(1);
        }
      },
      axisBorder: {
        show: true,
        color: theme === 'dark' ? '#374151' : '#E5E7EB'
      }
    },
    grid: {
      borderColor: theme === 'dark' ? '#374151' : '#E5E7EB',
      strokeDashArray: 4,
      padding: {
        top: 20,
        right: 0,
        bottom: 0,
        left: 0
      }
    },
    colors: ['#3B82F6'],
    tooltip: {
      theme: theme === 'dark' ? 'dark' : 'light',
      y: {
        formatter: function (val: number) {
          return val.toFixed(1) + ' tahun';
        }
      },
      marker: {
        show: true
      }
    },
    legend: {
      show: true,
      position: 'top',
      horizontalAlign: 'right',
      labels: {
        colors: theme === 'dark' ? '#fff' : '#000'
      }
    }
  };

  const series = [{
    name: 'Rata-rata Masa Studi Lulus (tahun)',
    data: data.map(item => item.rata_rata_masa_studi_lulus_tahun)
  }];

  if (!mounted) {
    return null;
  }

  if (loading) {
    return (
      <Card className="bg-white dark:bg-slate-900 shadow-lg">
        <CardHeader>
          <CardTitle className="text-xl font-bold dark:text-white">
            Loading...
          </CardTitle>
        </CardHeader>
      </Card>
    );
  }

  if (error) {
    return (
      <Card className="bg-white dark:bg-slate-900 shadow-lg">
        <CardHeader>
          <CardTitle className="text-xl font-bold text-red-500 dark:text-red-400">
            Error: {error}
          </CardTitle>
        </CardHeader>
      </Card>
    );
  }

  if (data.length === 0) {
    return (
      <Card className="bg-white dark:bg-slate-900 shadow-lg">
        <CardHeader>
          <CardTitle className="text-xl font-bold dark:text-white">
            Tidak ada data yang tersedia
          </CardTitle>
        </CardHeader>
      </Card>
    );
  }

  return (
    <Card className="bg-white dark:bg-slate-900 shadow-lg">
      <CardHeader>
        <div className="flex justify-between items-center">
          <CardTitle className="text-xl font-bold dark:text-white">
            Rata-rata Masa Studi Mahasiswa Lulus Berdasarkan Tahun Angkatan
            {selectedYear !== 'all' ? ` Angkatan ${selectedYear}` : ''}
          </CardTitle>
          {showDetailButton && (
            <Link href="/detail/masa-studi-lulus" target="_blank">
              <Button variant="outline" size="sm" className="flex items-center gap-1 dark:text-white">
                <ExternalLink className="size-3" />
                Detail
              </Button>
            </Link>
          )}
        </div>
      </CardHeader>
      <CardContent>
        <div className={`${height} w-full max-w-5xl mx-auto`}>
          {typeof window !== 'undefined' && (
            <Chart
              options={chartOptions}
              series={series}
              type={selectedYear === 'all' ? 'line' : 'bar'}
              height="100%"
              width="100%"
            />
          )}
        </div>
      </CardContent>
    </Card>
  );
}