'use client';

export { BadDebtDetailClientV2 } from './BadDebtDetailClientV2';

/**
 * 악성채권 추심관리 - UniversalListPage 마이그레이션
 *
 * 기존 IntegratedListTemplateV2 → UniversalListPage config 기반으로 변환
 * - 클라이언트 사이드 필터링 (검색, 거래처, 상태, 정렬)
 * - Stats 카드 (API 통계 또는 로컬 계산)
 * - tableHeaderActions: 3개 Select 필터
 * - Switch 토글 (설정)
 * - 삭제 다이얼로그 (deleteConfirmMessage)
 */

import { useState, useMemo, useCallback, useTransition } from 'react';
import { invalidateDashboard } from '@/lib/dashboard-invalidation';
import { useRouter } from 'next/navigation';
import { AlertTriangle, Pencil, Trash2 } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Checkbox } from '@/components/ui/checkbox';
import { Badge } from '@/components/ui/badge';
import { Switch } from '@/components/ui/switch';
import { TableRow, TableCell } from '@/components/ui/table';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { MobileCard } from '@/components/organisms/MobileCard';
import {
  UniversalListPage,
  type UniversalListConfig,
  type SelectionHandlers,
  type RowClickHandlers,
  type StatCard,
} from '@/components/templates/UniversalListPage';
import type { BadDebtRecord, SortOption } from './types';
import {
  COLLECTION_STATUS_LABELS,
  STATUS_FILTER_OPTIONS,
  STATUS_BADGE_STYLES,
  SORT_OPTIONS,
} from './types';
import { formatNumber } from '@/lib/utils/amount';
import { applyFilters, enumFilter } from '@/lib/utils/search';
import { deleteBadDebt, toggleBadDebt } from './actions';

// ===== 테이블 컬럼 정의 =====
const tableColumns = [
  { key: 'no', label: 'No.', className: 'text-center w-[60px]' },
  { key: 'vendorName', label: '거래처', className: 'w-[100px]', sortable: true, copyable: true },
  { key: 'debtAmount', label: '채권금액', className: 'text-right w-[140px]', sortable: true, copyable: true },
  { key: 'occurrenceDate', label: '발생일', className: 'text-center w-[110px]', sortable: true, copyable: true },
  { key: 'overdueDays', label: '연체일수', className: 'text-center w-[100px]', sortable: true, copyable: true },
  { key: 'managerName', label: '담당자', className: 'w-[100px]', sortable: true },
  { key: 'status', label: '상태', className: 'text-center w-[100px]', sortable: true },
  { key: 'setting', label: '설정', className: 'text-center w-[80px]' },
  { key: 'actions', label: '작업', className: 'text-center w-[80px]' },
];

// ===== Props 타입 정의 =====
interface BadDebtCollectionProps {
  initialData: BadDebtRecord[];
  initialSummary?: {
    total_amount: number;
    collecting_amount: number;
    legal_action_amount: number;
    collection_end_amount: number;
  } | null;
}

// 거래처 목록 추출 (필터용)
const getVendorOptions = (data: BadDebtRecord[]) => {
  const vendorMap = new Map<string, string>();
  data.forEach((item) => {
    vendorMap.set(item.vendorId, item.vendorName);
  });
  return Array.from(vendorMap.entries()).map(([id, name]) => ({
    value: id,
    label: name,
  }));
};

export function BadDebtCollection({ initialData, initialSummary }: BadDebtCollectionProps) {
  const router = useRouter();
  const [isPending, startTransition] = useTransition();

  // ===== 외부 상태 (UniversalListPage 외부에서 관리) =====
  const [data, setData] = useState<BadDebtRecord[]>(initialData);
  const [vendorFilter, setVendorFilter] = useState<string>('all');
  const [statusFilter, setStatusFilter] = useState<string>('all');
  const [sortOption, setSortOption] = useState<SortOption>('latest');

  // 거래처 옵션
  const vendorOptions = useMemo(() => getVendorOptions(data), [data]);

  // ===== 핸들러 =====
  const handleRowClick = useCallback(
    (item: BadDebtRecord) => {
      router.push(`/ko/accounting/bad-debt-collection/${item.id}?mode=view`);
    },
    [router]
  );

  // 설정 토글 핸들러 (API 호출)
  const handleSettingToggle = useCallback(
    (id: string, checked: boolean) => {
      // Optimistic update
      setData((prev) =>
        prev.map((item) => (item.id === id ? { ...item, settingToggle: checked } : item))
      );

      startTransition(async () => {
        const result = await toggleBadDebt(id);
        if (!result.success) {
          // Rollback on error
          setData((prev) =>
            prev.map((item) => (item.id === id ? { ...item, settingToggle: !checked } : item))
          );
          console.error('[BadDebtCollection] Toggle failed:', result.error);
        }
      });
    },
    []
  );

  // ===== 통계 계산 =====
  const statsData = useMemo(() => {
    if (initialSummary) {
      return {
        totalAmount: initialSummary.total_amount,
        collectingAmount: initialSummary.collecting_amount,
        legalActionAmount: initialSummary.legal_action_amount,
        collectionEndAmount: initialSummary.collection_end_amount,
      };
    }

    // 로컬 데이터로 계산 (fallback)
    const totalAmount = data.reduce((sum, d) => sum + d.debtAmount, 0);
    const collectingAmount = data
      .filter((d) => d.status === 'collecting')
      .reduce((sum, d) => sum + d.debtAmount, 0);
    const legalActionAmount = data
      .filter((d) => d.status === 'legalAction')
      .reduce((sum, d) => sum + d.debtAmount, 0);
    const collectionEndAmount = data
      .filter((d) => d.status === 'collectionEnd')
      .reduce((sum, d) => sum + d.debtAmount, 0);

    return { totalAmount, collectingAmount, legalActionAmount, collectionEndAmount };
  }, [data, initialSummary]);

  // ===== UniversalListPage Config =====
  const config: UniversalListConfig<BadDebtRecord> = useMemo(
    () => ({
      // 페이지 기본 정보
      title: '악성채권 추심관리',
      description: '연체 및 악성채권 현황을 추적하고 관리합니다',
      icon: AlertTriangle,
      basePath: '/accounting/bad-debt-collection',

      // ID 추출
      idField: 'id',

      // API 액션
      actions: {
        getList: async () => {
          return {
            success: true,
            data: data,
            totalCount: data.length,
          };
        },
        deleteItem: async (id: string) => {
          const result = await deleteBadDebt(id);
          if (result.success) {
            invalidateDashboard('badDebt');
            setData((prev) => prev.filter((item) => item.id !== id));
          }
          return { success: result.success, error: result.error };
        },
      },

      // 테이블 컬럼
      columns: tableColumns,

      // 클라이언트 사이드 필터링
      clientSideFiltering: true,
      itemsPerPage: 20,

      // 검색 필터
      searchPlaceholder: '거래처명, 거래처코드, 사업자번호 검색...',
      searchFilter: (item, searchValue) => {
        const search = searchValue.toLowerCase();
        return (
          item.vendorName.toLowerCase().includes(search) ||
          item.vendorCode.toLowerCase().includes(search) ||
          item.businessNumber.toLowerCase().includes(search)
        );
      },

      // 필터 설정
      filterConfig: [
        {
          key: 'vendor',
          label: '거래처',
          type: 'single',
          options: vendorOptions,
        },
        {
          key: 'status',
          label: '상태',
          type: 'single',
          options: STATUS_FILTER_OPTIONS.filter((o) => o.value !== 'all').map((o) => ({
            value: o.value,
            label: o.label,
          })),
        },
        {
          key: 'sortBy',
          label: '정렬',
          type: 'single',
          options: SORT_OPTIONS.map((o) => ({
            value: o.value,
            label: o.label,
          })),
        },
      ],
      initialFilters: {
        vendor: vendorFilter,
        status: statusFilter,
        sortBy: sortOption,
      },
      filterTitle: '악성채권 필터',

      // 커스텀 필터 함수
      customFilterFn: (items) => {
        if (!items || items.length === 0) return items;
        return applyFilters([...items], [
          enumFilter('vendorId', vendorFilter),
          enumFilter('status', statusFilter),
        ]);
      },

      // 커스텀 정렬 함수
      customSortFn: (items) => {
        const sorted = [...items];

        switch (sortOption) {
          case 'oldest':
            sorted.sort(
              (a, b) => new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime()
            );
            break;
          default: // latest
            sorted.sort(
              (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime()
            );
            break;
        }

        return sorted;
      },


      // Stats 카드
      computeStats: (): StatCard[] => [
        {
          label: '총 악성채권',
          value: `${formatNumber(statsData.totalAmount)}원`,
          icon: AlertTriangle,
          iconColor: 'text-red-500',
        },
        {
          label: '추심중',
          value: `${formatNumber(statsData.collectingAmount)}원`,
          icon: AlertTriangle,
          iconColor: 'text-orange-500',
        },
        {
          label: '법적조치',
          value: `${formatNumber(statsData.legalActionAmount)}원`,
          icon: AlertTriangle,
          iconColor: 'text-red-600',
        },
        {
          label: '회수완료',
          value: `${formatNumber(statsData.collectionEndAmount)}원`,
          icon: AlertTriangle,
          iconColor: 'text-green-500',
        },
      ],

      // 삭제 확인 메시지
      deleteConfirmMessage: {
        title: '악성채권 삭제',
        description: '이 악성채권 기록을 삭제하시겠습니까? 이 작업은 취소할 수 없습니다.',
      },

      // 테이블 행 렌더링
      renderTableRow: (
        item: BadDebtRecord,
        index: number,
        globalIndex: number,
        handlers: SelectionHandlers & RowClickHandlers<BadDebtRecord>
      ) => (
        <TableRow
          key={item.id}
          className="hover:bg-muted/50 cursor-pointer"
          onClick={() => handleRowClick(item)}
        >
          <TableCell className="text-center" onClick={(e) => e.stopPropagation()}>
            <Checkbox checked={handlers.isSelected} onCheckedChange={handlers.onToggle} />
          </TableCell>
          {/* No. */}
          <TableCell className="text-center text-sm text-gray-500">{globalIndex}</TableCell>
          {/* 거래처 */}
          <TableCell className="font-medium">{item.vendorName}</TableCell>
          {/* 채권금액 */}
          <TableCell className="text-right font-medium text-red-600">
            {formatNumber(item.debtAmount)}원
          </TableCell>
          {/* 발생일 */}
          <TableCell className="text-center">{item.occurrenceDate}</TableCell>
          {/* 연체일수 */}
          <TableCell className="text-center">{item.overdueDays}일</TableCell>
          {/* 담당자 */}
          <TableCell>{item.assignedManager?.name || '-'}</TableCell>
          {/* 상태 */}
          <TableCell className="text-center">
            <Badge variant="outline" className={STATUS_BADGE_STYLES[item.status]}>
              {COLLECTION_STATUS_LABELS[item.status]}
            </Badge>
          </TableCell>
          {/* 설정 */}
          <TableCell className="text-center" onClick={(e) => e.stopPropagation()}>
            <Switch
              checked={item.settingToggle}
              onCheckedChange={(checked) => handleSettingToggle(item.id, checked)}
              disabled={isPending}
            />
          </TableCell>
          {/* 작업 */}
          <TableCell className="text-center" onClick={(e) => e.stopPropagation()}>
            <div className="flex items-center justify-center gap-1">
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7"
                onClick={() => router.push(`/ko/accounting/bad-debt-collection/${item.id}?mode=edit`)}
              >
                <Pencil className="h-3.5 w-3.5" />
              </Button>
              <Button
                variant="ghost"
                size="icon"
                className="h-7 w-7 text-red-500 hover:text-red-700"
                onClick={() => handlers.onDelete?.(item)}
              >
                <Trash2 className="h-3.5 w-3.5" />
              </Button>
            </div>
          </TableCell>
        </TableRow>
      ),

      // 모바일 카드 렌더링
      renderMobileCard: (
        item: BadDebtRecord,
        index: number,
        globalIndex: number,
        handlers: SelectionHandlers & RowClickHandlers<BadDebtRecord>
      ) => (
        <MobileCard
          key={item.id}
          title={item.vendorName}
          subtitle={`채권금액: ${formatNumber(item.debtAmount)}원`}
          badge={COLLECTION_STATUS_LABELS[item.status]}
          badgeVariant="outline"
          badgeClassName={STATUS_BADGE_STYLES[item.status]}
          isSelected={handlers.isSelected}
          onToggle={handlers.onToggle}
          onClick={() => handleRowClick(item)}
          details={[
            { label: '연체일수', value: `${item.overdueDays}일` },
            { label: '발생일', value: item.occurrenceDate },
            { label: '담당자', value: item.assignedManager?.name || '-' },
          ]}
        />
      ),
    }),
    [
      data,
      vendorOptions,
      vendorFilter,
      statusFilter,
      sortOption,
      statsData,
      handleRowClick,
      handleSettingToggle,
      isPending,
    ]
  );

  return (
    <UniversalListPage
      config={config}
      initialData={data}
      onFilterChange={(filters) => {
        if (filters.vendor !== undefined) setVendorFilter(filters.vendor as string);
        if (filters.status !== undefined) setStatusFilter(filters.status as string);
        if (filters.sortBy !== undefined) setSortOption(filters.sortBy as SortOption);
      }}
    />
  );
}