'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";

// Dynamically import ApexCharts to avoid SSR issues
const Chart = dynamic(() => import('react-apexcharts'), { ssr: false });

interface IpkStatusData {
  tahun_angkatan: number;
  status_kuliah: string;
  total_mahasiswa: number;
  rata_rata_ipk: number;
}

interface Props {
  selectedYear: string;
  selectedStatus: string;
}

export default function IpkStatusChart({ selectedYear, selectedStatus }: Props) {
  const { theme, systemTheme } = useTheme();
  const [mounted, setMounted] = useState(false);
  const [data, setData] = useState<IpkStatusData[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

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

  useEffect(() => {
    const fetchData = async () => {
      try {
        setLoading(true);
        setError(null);
        
        const url = `/api/mahasiswa/ipk-status?tahun_angkatan=${selectedYear}&status_kuliah=${selectedStatus}`;
        
        const response = await fetch(url);
        
        if (!response.ok) {
          const errorText = await response.text();
          console.error('Error response:', errorText);
          throw new Error(`Failed to fetch data: ${response.status} ${response.statusText}`);
        }
        
        const result = await response.json();
        console.log('Received data:', result);
        
        if (!Array.isArray(result)) {
          console.error('Invalid data format:', result);
          throw new Error('Invalid data format received from server');
        }
        
        // Sort data by tahun_angkatan
        const sortedData = result.sort((a: IpkStatusData, b: IpkStatusData) => 
          a.tahun_angkatan - b.tahun_angkatan
        );
        
        console.log('Sorted data:', sortedData);
        setData(sortedData);
      } catch (err) {
        console.error('Error in fetchData:', err);
        setError(err instanceof Error ? err.message : 'An error occurred while fetching data');
      } finally {
        setLoading(false);
      }
    };

    fetchData();
  }, [selectedYear, selectedStatus]);

  // Log data changes
  useEffect(() => {
    console.log('Current data state:', data);
  }, [data]);

  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: 'smooth',
      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(2);
      },
      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 IPK',
        style: {
          fontSize: '14px',
          fontWeight: 'bold',
          color: theme === 'dark' ? '#fff' : '#000'
        }
      },
      min: 0,
      max: 4,
      labels: {
        style: {
          fontSize: '12px',
          colors: theme === 'dark' ? '#fff' : '#000'
        },
        formatter: function (val: number) {
          return val.toFixed(2);
        }
      },
      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(2);
        }
      },
      marker: {
        show: true
      }
    },
    legend: {
      show: true,
      position: 'top',
      horizontalAlign: 'right',
      labels: {
        colors: theme === 'dark' ? '#fff' : '#000'
      }
    }
  };

  // Process data for series
  const processSeriesData = () => {
    return [{
      name: 'Rata-rata IPK',
      data: data.map(item => item.rata_rata_ipk)
    }];
  };

  const series = processSeriesData();

  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">
            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>
        <CardTitle className="text-xl font-bold dark:text-white">
          Rata-rata IPK Mahasiswa {selectedStatus}
          {selectedYear !== 'all' ? ` Angkatan ${selectedYear}` : ''}
        </CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-[300px] sm:h-[350px] md:h-[400px] w-full max-w-5xl mx-auto">
          {typeof window !== 'undefined' && (
            <Chart
              options={chartOptions}
              series={series}
              type={selectedYear === 'all' ? 'line' : 'bar'}
              height="100%"
              width="90%"
            />
          )}
        </div>
      </CardContent>
    </Card>
  );
}