'use client';

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

// Import ApexCharts secara dinamis untuk menghindari masalah SSR
const Chart = dynamic(() => import('react-apexcharts'), { ssr: false });

interface MahasiswaStatistik {
  tahun_angkatan: number;
  total_mahasiswa: number;
  pria: number;
  wanita: number;
}

interface StatistikMahasiswaChartProps {
  height?: string;
  showDetailButton?: boolean;
}

export default function StatistikMahasiswaChart({ 
  height = "h-[300px] sm:h-[350px] md:h-[300px]",
  showDetailButton = true 
}: StatistikMahasiswaChartProps) {
  const { theme } = useTheme();
  const [statistikData, setStatistikData] = useState<MahasiswaStatistik[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [chartOptions, setChartOptions] = useState({
    chart: {
      type: 'bar' as const,
      stacked: true,
      toolbar: {
        show: true,
        tools: {
          download: true,
          selection: true,
          zoom: true,
          zoomin: true,
          zoomout: true,
          pan: true,
          reset: true
        },
      },
      zoom: {
        enabled: true,
        type: 'x' as const,
        autoScaleYaxis: true
      },
    },
    markers: {
      size: 10,
      shape: 'circle' as const,
      strokeWidth: 0,
      hover: {
        size: 10
      }
    },
    plotOptions: {
      bar: {
        horizontal: false,
        columnWidth: '55%',     
      },
    },
    dataLabels: {
      enabled: true,
      formatter: function (val: number, opts: any) {
        const seriesIndex = opts.seriesIndex;
        const dataPointIndex = opts.dataPointIndex;
        
        // Hitung total dari Laki-laki (index 0) dan Perempuan (index 1)
        const lakiLakiData = opts.w.config.series[0]?.data || [];
        const perempuanData = opts.w.config.series[1]?.data || [];
        const totalValue = (lakiLakiData[dataPointIndex] || 0) + (perempuanData[dataPointIndex] || 0);
        
        if (totalValue === 0 || val === 0) return '0%';
        
        const percentage = ((val / totalValue) * 100).toFixed(1);
        return percentage + '%';
      },
      position: 'top',
      style: {
        fontSize: '12px',
        colors: ['#000']
      },
    },
    stroke: {
      show: true,
      width: 2,
      colors: ['transparent', 'transparent'],
      curve: 'straight' as const
    },
    xaxis: {
      categories: [] as number[],
      title: {
        text: 'Tahun Angkatan',
        style: {
          fontSize: '14px',
          fontWeight: 'bold',
          color: '#000'
        }
      },
      labels: {
        style: {
          fontSize: '12px',
          colors: '#000'
        }
      }
    },
    yaxis: [
      {
        title: {
          text: 'Jumlah Mahasiswa',
          style: {
            fontSize: '14px',
            fontWeight: 'bold',
            color: '#000'
          }
        },
        labels: {
          style: {
            fontSize: '12px',
            colors: '#000'
          }
        },
        min:0,
        tickAmount: 5
      }
    ],
    fill: {
      opacity: 1
    },
    legend: {
      position: 'top' as const,
      fontSize: '14px',
      markers: {
        size: 12,
      },
      itemMargin: {
        horizontal: 10,
      },
      labels: {
        colors: '#000'
      }
    },
    colors: ['#3B82F6', '#EC4899'],
    tooltip: {
      theme: 'light',
      shared: true,
      intersect: false,
      custom: function({ series, seriesIndex, dataPointIndex, w }: any) {
        const lakiLaki = series[0][dataPointIndex];
        const perempuan = series[1][dataPointIndex];
        const total = lakiLaki + perempuan;
        const tahun = w.globals.labels[dataPointIndex];
        
        return `
          <div style="
            padding: 12px 16px; 
            background: rgba(255, 255, 255, 0.95); 
            backdrop-filter: blur(10px);
            border: none; 
            border-radius: 12px; 
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            min-width: 180px;
          ">
            <div style="
              font-size: 13px; 
              font-weight: 600; 
              color: #1f2937; 
              margin-bottom: 8px;
              text-align: center;
            ">Angkatan ${tahun}</div>
            <div style="display: flex; align-items: center; margin-bottom: 4px;">
              <div style="width: 8px; height: 8px; background: #3B82F6; border-radius: 50%; margin-right: 8px;"></div>
              <span style="font-size: 12px; color: #374151;">Laki-laki</span>
              <span style="font-size: 12px; font-weight: 600; color: #1f2937; margin-left: auto;">${lakiLaki}</span>
            </div>
            <div style="display: flex; align-items: center; margin-bottom: 4px;">
              <div style="width: 8px; height: 8px; background: #EC4899; border-radius: 50%; margin-right: 8px;"></div>
              <span style="font-size: 12px; color: #374151;">Perempuan</span>
              <span style="font-size: 12px; font-weight: 600; color: #1f2937; margin-left: auto;">${perempuan}</span>
            </div>
            <div style="
              border-top: 1px solid #e5e7eb; 
              margin-top: 8px; 
              padding-top: 8px;
              display: flex; 
              align-items: center;
            ">
              <span style="font-size: 12px; font-weight: 600; color: #1f2937;">Total</span>
              <span style="font-size: 13px; font-weight: 700; color: #10B981; margin-left: auto;">${total}</span>
            </div>
          </div>
        `;
      }
    }
  });

  useEffect(() => {
    const fetchData = async () => {
      try {
        const statistikResponse = await fetch('/api/mahasiswa/statistik', {
          cache: 'no-store',
        });
        
        if (!statistikResponse.ok) {
          throw new Error('Failed to fetch statistik data');
        }
        
        const statistikData = await statistikResponse.json();
        setStatistikData(statistikData);
      } catch (err) {
        setError(err instanceof Error ? err.message : 'Terjadi kesalahan');
        console.error('Error fetching data:', err);
      } finally {
        setLoading(false);
      }
    };

    fetchData();
  }, []);

  // Perbarui tema saat berubah
  useEffect(() => {
    const currentTheme = theme;
    const textColor = currentTheme === 'dark' ? '#fff' : '#000';
    const tooltipTheme = currentTheme === 'dark' ? 'dark' : 'light';

    setChartOptions(prev => ({
      ...prev,
      chart: {
        ...prev.chart,
        background: currentTheme === 'dark' ? '#0F172B' : '#fff',
      },
      dataLabels: {
        ...prev.dataLabels,
        formatter: function (val: number, opts: any) {
          const dataPointIndex = opts.dataPointIndex;
          
          const lakiLakiData = opts.w.config.series[0]?.data || [];
          const perempuanData = opts.w.config.series[1]?.data || [];
          const totalValue = (lakiLakiData[dataPointIndex] || 0) + (perempuanData[dataPointIndex] || 0);
          
          if (totalValue === 0 || val === 0) return '0%';
          
          const percentage = ((val / totalValue) * 100).toFixed(0);
          return percentage + '%';
        },
        style: {
          ...prev.dataLabels.style,
          colors: [textColor]
        },
      },
      xaxis: {
        ...prev.xaxis,
        title: {
          ...prev.xaxis.title,
          style: {
            ...prev.xaxis.title.style,
            color: textColor
          }
        },
        labels: {
          ...prev.xaxis.labels,
          style: {
            ...prev.xaxis.labels.style,
            colors: textColor
          }
        }
      },
      yaxis: [
        {
          ...prev.yaxis[0],
          title: {
            ...prev.yaxis[0].title,
            style: {
              ...prev.yaxis[0].title.style,
              color: textColor
            }
          },
          labels: {
            ...prev.yaxis[0].labels,
            style: {
              ...prev.yaxis[0].labels.style,
              colors: textColor
            }
          }
        }
      ],
      legend: {
        ...prev.legend,
        labels: {
          ...prev.legend.labels,
          colors: textColor
        }
      },
      tooltip: {
        ...prev.tooltip,
        theme: tooltipTheme,
        custom: function({ series, seriesIndex, dataPointIndex, w }: any) {
          const lakiLaki = series[0][dataPointIndex];
          const perempuan = series[1][dataPointIndex];
          const total = lakiLaki + perempuan;
          const tahun = w.globals.labels[dataPointIndex];
          
          const isDark = currentTheme === 'dark';
          
          return `
            <div style="
              padding: 12px 16px; 
              background: ${isDark ? 'rgba(30, 41, 59, 0.95)' : 'rgba(255, 255, 255, 0.95)'}; 
              backdrop-filter: blur(10px);
              border: none; 
              border-radius: 12px; 
              box-shadow: 0 8px 32px ${isDark ? 'rgba(0, 0, 0, 0.3)' : 'rgba(0, 0, 0, 0.1)'};
              font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
              min-width: 180px;
            ">
              <div style="
                font-size: 13px; 
                font-weight: 600; 
                color: ${isDark ? '#f1f5f9' : '#1f2937'}; 
                margin-bottom: 8px;
                text-align: center;
              ">Angkatan ${tahun}</div>
              <div style="display: flex; align-items: center; margin-bottom: 4px;">
                <div style="width: 8px; height: 8px; background: #3B82F6; border-radius: 50%; margin-right: 8px;"></div>
                <span style="font-size: 12px; color: ${isDark ? '#cbd5e1' : '#374151'};">Laki-laki</span>
                <span style="font-size: 12px; font-weight: 600; color: ${isDark ? '#f1f5f9' : '#1f2937'}; margin-left: auto;">${lakiLaki}</span>
              </div>
              <div style="display: flex; align-items: center; margin-bottom: 4px;">
                <div style="width: 8px; height: 8px; background: #EC4899; border-radius: 50%; margin-right: 8px;"></div>
                <span style="font-size: 12px; color: ${isDark ? '#cbd5e1' : '#374151'};">Perempuan</span>
                <span style="font-size: 12px; font-weight: 600; color: ${isDark ? '#f1f5f9' : '#1f2937'}; margin-left: auto;">${perempuan}</span>
              </div>
              <div style="
                border-top: 1px solid ${isDark ? '#475569' : '#e5e7eb'}; 
                margin-top: 8px; 
                padding-top: 8px;
                display: flex; 
                align-items: center;
              ">
                <span style="font-size: 12px; font-weight: 600; color: ${isDark ? '#f1f5f9' : '#1f2937'};">Total</span>
                <span style="font-size: 13px; font-weight: 700; color: #10B981; margin-left: auto;">${total}</span>
              </div>
            </div>
          `;
        }
      }
    }));
  }, [theme]);

  // Perbarui kategori saat data berubah
  useEffect(() => {
    if (statistikData.length > 0) {
      
      setChartOptions(prev => ({
        ...prev,
        xaxis: {
          ...prev.xaxis,
          categories: statistikData.map(item => item.tahun_angkatan)
        },
        yaxis: [
          {
            ...prev.yaxis[0],
          }
        ]
      }));
    }
  }, [statistikData]);

  const chartSeries = [
    {
      name: 'Laki-laki',
      type: 'bar' as const,
      data: statistikData.map(item => item.pria)
    },
    {
      name: 'Perempuan',
      type: 'bar' as const,
      data: statistikData.map(item => item.wanita)
    }
  ];

  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>
    );
  }

  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">
              Persentase Jumlah Mahasiswa Berdasarkan Gender dan Tahun Angkatan
            </CardTitle>
            {showDetailButton && (
              <Link href="/detail/jumlah-mahasiswa" 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`}>
            <Chart
            options={chartOptions}
            series={chartSeries}
            type="bar"
            height="100%"
            width="100%"
          />
        </div>
      </CardContent>
      </Card>
);
}