'use client';

import { useState, useCallback, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import {
  Banknote,
  List,
} from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { DatePicker } from '@/components/ui/date-picker';
import { Label } from '@/components/ui/label';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { DeleteConfirmDialog } from '@/components/ui/confirm-dialog';
import { PageLayout } from '@/components/organisms/PageLayout';
import { PageHeader } from '@/components/organisms/PageHeader';
import { toast } from 'sonner';
import type { DepositRecord, DepositType } from './types';
import { DEPOSIT_TYPE_SELECTOR_OPTIONS } from './types';
import {
  getDepositById,
  createDeposit,
  updateDeposit,
  deleteDeposit,
  getVendors,
} from './actions';

// ===== Props =====
interface DepositDetailProps {
  depositId: string;
  mode: 'view' | 'edit' | 'new';
}

export function DepositDetail({ depositId, mode }: DepositDetailProps) {
  const router = useRouter();
  const isViewMode = mode === 'view';
  const isNewMode = mode === 'new';

  // ===== 폼 상태 =====
  const [depositDate, setDepositDate] = useState('');
  const [accountName, setAccountName] = useState('');
  const [depositorName, setDepositorName] = useState('');
  const [depositAmount, setDepositAmount] = useState(0);
  const [note, setNote] = useState('');
  const [vendorId, setVendorId] = useState('');
  const [depositType, setDepositType] = useState<DepositType>('unset');
  const [showDeleteDialog, setShowDeleteDialog] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [vendors, setVendors] = useState<{ id: string; name: string }[]>([]);

  // ===== 거래처 목록 로드 =====
  useEffect(() => {
    const loadVendors = async () => {
      const result = await getVendors();
      if (result.success) {
        setVendors(result.data);
      }
    };
    loadVendors();
  }, []);

  // ===== 데이터 로드 =====
  useEffect(() => {
    const loadDeposit = async () => {
      if (depositId && !isNewMode) {
        setIsLoading(true);
        const result = await getDepositById(depositId);
        if (result.success && result.data) {
          setDepositDate(result.data.depositDate);
          setAccountName(result.data.accountName);
          setDepositorName(result.data.depositorName);
          setDepositAmount(result.data.depositAmount);
          setNote(result.data.note);
          setVendorId(result.data.vendorId);
          setDepositType(result.data.depositType);
        } else {
          toast.error(result.error || '입금 내역을 불러오는데 실패했습니다.');
        }
        setIsLoading(false);
      }
    };
    loadDeposit();
  }, [depositId, isNewMode]);

  // ===== 저장 핸들러 =====
  const handleSave = useCallback(async () => {
    if (!vendorId) {
      toast.error('거래처를 선택해주세요.');
      return;
    }
    if (depositType === 'unset') {
      toast.error('입금 유형을 선택해주세요.');
      return;
    }

    setIsLoading(true);
    const formData: Partial<DepositRecord> = {
      depositDate,
      accountName,
      depositorName,
      depositAmount,
      note,
      vendorId,
      vendorName: vendors.find(v => v.id === vendorId)?.name || '',
      depositType,
    };

    const result = isNewMode
      ? await createDeposit(formData)
      : await updateDeposit(depositId, formData);

    if (result.success) {
      toast.success(isNewMode ? '입금 내역이 등록되었습니다.' : '입금 내역이 수정되었습니다.');
      router.push('/ko/accounting/deposits');
    } else {
      toast.error(result.error || '저장에 실패했습니다.');
    }
    setIsLoading(false);
  }, [depositId, depositDate, accountName, depositorName, depositAmount, note, vendorId, vendors, depositType, router, isNewMode]);

  // ===== 취소 핸들러 =====
  const handleCancel = useCallback(() => {
    if (isNewMode) {
      router.push('/ko/accounting/deposits');
    } else {
      router.push(`/ko/accounting/deposits/${depositId}?mode=view`);
    }
  }, [router, depositId, isNewMode]);

  // ===== 목록으로 이동 =====
  const handleBack = useCallback(() => {
    router.push('/ko/accounting/deposits');
  }, [router]);

  // ===== 수정 모드로 이동 =====
  const handleEdit = useCallback(() => {
    router.push(`/ko/accounting/deposits/${depositId}?mode=edit`);
  }, [router, depositId]);

  // ===== 삭제 핸들러 =====
  const handleDelete = useCallback(async () => {
    setIsLoading(true);
    const result = await deleteDeposit(depositId);
    if (result.success) {
      toast.success('입금 내역이 삭제되었습니다.');
      setShowDeleteDialog(false);
      router.push('/ko/accounting/deposits');
    } else {
      toast.error(result.error || '삭제에 실패했습니다.');
    }
    setIsLoading(false);
  }, [depositId, router]);

  return (
    <PageLayout>
      {/* 페이지 헤더 */}
      <PageHeader
        title={isNewMode ? '입금 등록' : isViewMode ? '입금 상세' : '입금 수정'}
        description="입금 상세 내역을 등록합니다"
        icon={Banknote}
      />

      {/* 헤더 액션 버튼 */}
      <div className="flex items-center justify-end gap-2 mb-6">
        {/* view 모드: [목록] [삭제] [수정] */}
        {isViewMode ? (
          <>
            <Button variant="outline" onClick={handleBack}>
              <List className="h-4 w-4 mr-2" />
              목록
            </Button>
            <Button
              variant="outline"
              className="text-red-500 border-red-200 hover:bg-red-50"
              onClick={() => setShowDeleteDialog(true)}
              disabled={isLoading}
            >
              삭제
            </Button>
            <Button onClick={handleEdit} className="bg-blue-500 hover:bg-blue-600">
              수정
            </Button>
          </>
        ) : (
          /* edit/new 모드: [취소] [저장/등록] */
          <>
            <Button variant="outline" onClick={handleCancel} disabled={isLoading}>
              취소
            </Button>
            <Button
              onClick={handleSave}
              className="bg-blue-500 hover:bg-blue-600"
              disabled={isLoading}
            >
              {isLoading ? '처리중...' : isNewMode ? '등록' : '저장'}
            </Button>
          </>
        )}
      </div>

      {/* 기본 정보 섹션 */}
      <Card className="mb-6">
        <CardHeader>
          <CardTitle className="text-lg">기본 정보</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
            {/* 입금일 */}
            <div className="space-y-2">
              <Label htmlFor="depositDate">입금일</Label>
              <DatePicker
                value={depositDate}
                disabled
                className="bg-gray-50"
              />
            </div>

            {/* 입금계좌 */}
            <div className="space-y-2">
              <Label htmlFor="accountName">입금계좌</Label>
              <Input
                id="accountName"
                value={accountName}
                readOnly
                disabled
                className="bg-gray-50"
              />
            </div>

            {/* 입금자명 */}
            <div className="space-y-2">
              <Label htmlFor="depositorName">입금자명</Label>
              <Input
                id="depositorName"
                value={depositorName}
                readOnly
                disabled
                className="bg-gray-50"
              />
            </div>

            {/* 입금금액 */}
            <div className="space-y-2">
              <Label htmlFor="depositAmount">입금금액</Label>
              <Input
                id="depositAmount"
                value={depositAmount.toLocaleString()}
                readOnly
                disabled
                className="bg-gray-50"
              />
            </div>

            {/* 적요 */}
            <div className="space-y-2 md:col-span-2">
              <Label htmlFor="note">적요</Label>
              <Input
                id="note"
                value={note}
                onChange={(e) => setNote(e.target.value)}
                placeholder="적요를 입력해주세요"
                disabled={isViewMode}
              />
            </div>

            {/* 거래처 */}
            <div className="space-y-2">
              <Label htmlFor="vendorId">
                거래처 <span className="text-red-500">*</span>
              </Label>
              <Select value={vendorId} onValueChange={setVendorId} disabled={isViewMode}>
                <SelectTrigger>
                  <SelectValue placeholder="선택" />
                </SelectTrigger>
                <SelectContent>
                  {vendors.map((vendor) => (
                    <SelectItem key={vendor.id} value={vendor.id}>
                      {vendor.name}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>

            {/* 입금 유형 */}
            <div className="space-y-2">
              <Label htmlFor="depositType">
                입금 유형 <span className="text-red-500">*</span>
              </Label>
              <Select value={depositType} onValueChange={(v) => setDepositType(v as DepositType)} disabled={isViewMode}>
                <SelectTrigger>
                  <SelectValue placeholder="선택" />
                </SelectTrigger>
                <SelectContent>
                  {DEPOSIT_TYPE_SELECTOR_OPTIONS.map((option) => (
                    <SelectItem key={option.value} value={option.value}>
                      {option.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* ===== 삭제 확인 다이얼로그 ===== */}
      <DeleteConfirmDialog
        open={showDeleteDialog}
        onOpenChange={setShowDeleteDialog}
        onConfirm={handleDelete}
        title="입금 삭제"
        description="이 입금 내역을 삭제하시겠습니까? 삭제된 데이터는 복구할 수 없습니다."
        loading={isLoading}
      />
    </PageLayout>
  );
}