'use client';

/* IMPORT */
import { Bar, BarChart, Cell, LabelList, XAxis, YAxis } from 'recharts';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { ChartConfig, ChartContainer, ChartTooltip, ChartTooltipContent } from '@/components/ui/chart';
import { getRisksViewCount } from '../service';
import { LoaderCircle } from 'lucide-react';
import { type DateRange } from 'react-day-picker';
import { useEffect, useState, useMemo, useCallback } from 'react';
import { useParams, useRouter, useSearchParams } from 'next/navigation';
import { ValueType } from 'recharts/types/component/DefaultTooltipContent';

// ----------------------------------------------------------------------------------------------------

/* TYPES */
interface RisksDashboardProps {
  targetValues: string[];
  defaultDateRange: DateRange;
}

interface CountData {
  [key: string]: number;
}

interface ChartData {
  name: string;
  count: number;
  color: string;
}

// ----------------------------------------------------------------------------------------------------

/* RISKS DASHBOARD COMPONENT */
function RisksDashboard(props: RisksDashboardProps) {
  const { targetValues, defaultDateRange } = props;
  const router = useRouter();
  const searchParams = useSearchParams();
  const params = useParams();
  const [counts, setCounts] = useState<CountData>({});
  const [isLoading, setIsLoading] = useState(true);
  const [dateQuery, setDateQuery] = useState({
    from: defaultDateRange.from?.toISOString() ?? '',
    to: defaultDateRange.to?.toISOString() ?? '',
    search: '',
  });
  const language = params?.lng as string;

  const chartData: ChartData[] = useMemo(() => {
    const chartItems = ['단기연체', '노무비체불', '세금체납', '채무불이행', '행정처분', '당좌거래정지', '기업회생', '휴/폐업'];
    const colors = [
      '#22c55e',
      '#6dd85d',
      '#b4e85b',
      '#f0f06d',
      '#fce46d',
      '#fcb36d',
      '#f98b6d',
      '#ef4444',
    ];
    
    return chartItems.map((item, index) => ({
      name: item,
      count: counts[item] ?? 0,
      color: colors[index],
    }));
  }, [counts]);
  const chartConfig: ChartConfig = {
    count: {
      label: '건수',
    },
  };

  const fetchAllCounts = useCallback(async () => {
    if (!dateQuery.from || !dateQuery.to) {
      return;
    }

    setIsLoading(true);
    try {
      const countPromises = targetValues.map(async (targetValue) => {
        const filters = [
          {
            id: 'eventType',
            value: targetValue,
            type: 'text',
            operator: 'iLike',
            rowId: '',
          }
        ];
        
        const searchParams = {
          filters,
          joinOperator: 'and',
          from: dateQuery.from,
          to: dateQuery.to,
          search: dateQuery.search,
          flags: [],
          page: 1,
          perPage: 10,
          sort: [{ id: 'occuredAt', desc: true }],
        };
        
        const { count } = await getRisksViewCount(searchParams as any);
        return { targetValue, count };
      });

      const results = await Promise.all(countPromises);
      const newCounts: CountData = {};
      results.forEach(({ targetValue, count }) => {
        newCounts[targetValue] = count;
      });

      setCounts(newCounts);
    } catch (error) {
      console.error('리스크 데이터 개수 조회에 실패했습니다:', error);
      const resetCounts: CountData = {};
      targetValues.forEach(value => {
        resetCounts[value] = 0;
      });
      setCounts(resetCounts);
    } finally {
      setIsLoading(false);
    }
  }, [dateQuery, targetValues]);

  useEffect(() => {
    const urlParams = new URLSearchParams(searchParams?.toString());
    const from = urlParams.get('from') ?? defaultDateRange.from?.toISOString() ?? '';
    const to = urlParams.get('to') ?? defaultDateRange.to?.toISOString() ?? '';
    const search = urlParams.get('search') ?? '';

    setDateQuery((prev) => {
      if (prev.from === from && prev.to === to && prev.search === search) {
        return prev;
      }
      return { from, to, search };
    });
  }, [searchParams, defaultDateRange]);

  useEffect(() => {
    fetchAllCounts();
  }, [fetchAllCounts]);

  const handleButtonClick = useCallback((targetValue: string) => {
    const newFilters = [
      {
        id: 'eventType',
        value: targetValue,
        type: 'text',
        operator: 'iLike',
        rowId: '',
      }
    ];
    
    const newUrlParams = new URLSearchParams(searchParams?.toString());
    newUrlParams.set('filters', JSON.stringify(newFilters));

    const baseUrl = `/${language}/evcp/risk-management`;
    const fullUrl = `${baseUrl}?${newUrlParams.toString()}`;
    const decodedUrl = decodeURIComponent(fullUrl);
    
    router.push(decodedUrl);
    router.refresh();
  }, [searchParams, language, router]);

  return (
    <div className="flex items-center justify-center gap-16">
      <div className="w-3/5 grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-x-16 gap-y-4 p-8">
        {targetValues.map((targetValue) => (
          <div key={targetValue} className="w-full">
            <div className="w-32 flex flex-col items-center justify-center gap-2">
              <div className="font-bold">{targetValue}</div>
              <Button 
                className="w-full h-12 text-lg font-bold" 
                onClick={() => handleButtonClick(targetValue)}
                disabled={isLoading}
              >
                {isLoading ? (
                  <LoaderCircle width={16} className="animate-spin" />
                ) : (
                  <>
                    {counts[targetValue] ?? 0}건
                  </>
                )}
              </Button>
            </div>
          </div>
        ))}
      </div>
      <Card className="w-1/3">
        <CardHeader>
          <CardTitle className="text-lg font-semibold">주요 리스크 현황</CardTitle>
        </CardHeader>
        <CardContent>
          {chartData.filter(item => item.count > 0).length === 0 ? (
            <div className="flex items-center justify-center h-[300px] text-gray-500">
              주요 리스크가 존재하지 않습니다.
            </div>
          ) : (
            <ChartContainer config={chartConfig} className="h-[300px]">
              <BarChart
                data={chartData.filter(item => item.count > 0)}
                layout="vertical"
                margin={{ left: 30, right: 30 }}
              >
                <XAxis type="number" dataKey="count" hide />
                <YAxis
                  dataKey="name"
                  type="category"
                  tickLine={false}
                  tickMargin={10}
                  axisLine={false}
                />
                <ChartTooltip
                  content={<ChartTooltipContent className="flex justify-center" />}
                  formatter={(value) => [`${value}건`]}
                />
                <Bar dataKey="count" radius={[8, 8, 8, 8]}>
                  <LabelList
                    position="right"
                    offset={12}
                    className="fill-foreground"
                    fontSize={12}
                    formatter={(value: ValueType) => [`${value}건`]}
                  />
                  {chartData.map((entry, index) => (
                    <Cell key={`cell-${index}`} fill={entry.color} />
                  ))}
                </Bar>
              </BarChart>
            </ChartContainer>
          )}
        </CardContent>
      </Card>
    </div>
  );
}

// ----------------------------------------------------------------------------------------------------

/* EXPORT */
export default RisksDashboard;