'use client';

import { useState, useCallback, useMemo } from 'react';
import { useRouter } from 'next/navigation';
import { Plus, Trash2, Eye, Stamp } 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 { Textarea } from '@/components/ui/textarea';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { QuantityInput } from '@/components/ui/quantity-input';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
import { Checkbox } from '@/components/ui/checkbox';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { IntegratedDetailTemplate } from '@/components/templates/IntegratedDetailTemplate';
import { handoverReportConfig } from './handoverReportConfig';
import { toast } from 'sonner';
import type {
  HandoverReportDetail,
  HandoverReportFormData,
  HandoverStatus,
  ConstructionManager,
} from './types';
import {
  HANDOVER_STATUS_LABELS,
  CONSTRUCTION_PM_OPTIONS,
  MANAGER_OPTIONS,
  getEmptyHandoverReportFormData,
  handoverReportDetailToFormData,
} from './types';
import { updateHandoverReport, deleteHandoverReport } from './actions';
import { HandoverReportDocumentModal } from './modals/HandoverReportDocumentModal';
import {
  ElectronicApprovalModal,
  type ElectronicApproval,
  getEmptyElectronicApproval,
} from '../common';
import { formatNumber } from '@/lib/utils/amount';

interface HandoverReportDetailFormProps {
  mode: 'view' | 'edit';
  reportId: string;
  initialData?: HandoverReportDetail;
}

export default function HandoverReportDetailForm({
  mode,
  reportId,
  initialData,
}: HandoverReportDetailFormProps) {
  const router = useRouter();
  const isViewMode = mode === 'view';
  const isEditMode = mode === 'edit';

  // 폼 데이터
  const [formData, setFormData] = useState<HandoverReportFormData>(
    initialData ? handoverReportDetailToFormData(initialData) : getEmptyHandoverReportFormData()
  );

  // 로딩 상태
  const [, _setIsLoading] = useState(false);

  // 모달 상태
  const [showDocumentModal, setShowDocumentModal] = useState(false);
  const [showApprovalModal, setShowApprovalModal] = useState(false);

  // 전자결재 데이터
  const [approvalData, setApprovalData] = useState<ElectronicApproval>(
    getEmptyElectronicApproval()
  );

  // 폼 필드 변경
  const handleFieldChange = useCallback(
    (field: keyof HandoverReportFormData, value: string | number | boolean) => {
      setFormData((prev) => ({ ...prev, [field]: value }));
    },
    []
  );

  // 저장 핸들러 (IntegratedDetailTemplate용)
  const handleSubmit = useCallback(async (): Promise<{ success: boolean; error?: string }> => {
    try {
      const result = await updateHandoverReport(reportId, formData);
      if (result.success) {
        toast.success('수정이 완료되었습니다.');
        router.push(`/ko/construction/project/contract/handover-report/${reportId}?mode=view`);
        router.refresh();
        return { success: true };
      }
      return { success: false, error: result.error || '저장에 실패했습니다.' };
    } catch (error) {
      return { success: false, error: error instanceof Error ? error.message : '저장에 실패했습니다.' };
    }
  }, [router, reportId, formData]);

  // 삭제 핸들러 (IntegratedDetailTemplate용)
  const handleDelete = useCallback(async (): Promise<{ success: boolean; error?: string }> => {
    try {
      const result = await deleteHandoverReport(reportId);
      if (result.success) {
        toast.success('인수인계보고서가 삭제되었습니다.');
        router.push('/ko/construction/project/contract/handover-report');
        router.refresh();
        return { success: true };
      }
      return { success: false, error: result.error || '삭제에 실패했습니다.' };
    } catch (error) {
      return { success: false, error: error instanceof Error ? error.message : '삭제에 실패했습니다.' };
    }
  }, [router, reportId]);

  // 인수인계보고서 보기 핸들러
  const handleViewDocument = useCallback(() => {
    setShowDocumentModal(true);
  }, []);

  // 전자결재 핸들러
  const handleApproval = useCallback(() => {
    setShowApprovalModal(true);
  }, []);

  // 전자결재 저장
  const handleApprovalSave = useCallback((approval: ElectronicApproval) => {
    setApprovalData(approval);
    setShowApprovalModal(false);
    toast.success('전자결재 정보가 저장되었습니다.');
  }, []);

  // 커스텀 헤더 액션 (view 모드에서 인수인계보고서 보기, 전자결재 버튼)
  const customHeaderActions = useMemo(() => {
    if (!isViewMode) return null;
    return (
      <>
        <Button variant="outline" onClick={handleViewDocument} size="sm">
          <Eye className="h-4 w-4 md:mr-2" />
          <span className="hidden md:inline">인수인계보고서 보기</span>
        </Button>
        <Button variant="outline" onClick={handleApproval} size="sm">
          <Stamp className="h-4 w-4 md:mr-2" />
          <span className="hidden md:inline">전자결재</span>
        </Button>
      </>
    );
  }, [isViewMode, handleViewDocument, handleApproval]);

  // 공사담당자 추가
  const handleAddManager = useCallback(() => {
    const newManager: ConstructionManager = {
      id: String(Date.now()),
      name: '',
      nonPerformanceReason: '',
    };
    setFormData((prev) => ({
      ...prev,
      constructionManagers: [...prev.constructionManagers, newManager],
    }));
  }, []);

  // 공사담당자 삭제
  const handleRemoveManager = useCallback((managerId: string) => {
    setFormData((prev) => ({
      ...prev,
      constructionManagers: prev.constructionManagers.filter((m) => m.id !== managerId),
    }));
  }, []);

  // 공사담당자 변경
  const handleManagerChange = useCallback(
    (managerId: string, field: keyof ConstructionManager, value: string | boolean) => {
      setFormData((prev) => ({
        ...prev,
        constructionManagers: prev.constructionManagers.map((m) =>
          m.id === managerId ? { ...m, [field]: value } : m
        ),
      }));
    },
    []
  );

  // 장비 외 실행금액 변경
  const handleEquipmentCostChange = useCallback(
    (field: 'shippingCost' | 'highAltitudeWork' | 'publicExpense', value: number) => {
      setFormData((prev) => ({
        ...prev,
        externalEquipmentCost: {
          ...prev.externalEquipmentCost,
          [field]: value,
        },
      }));
    },
    []
  );

  // 계약 ITEM 비고 변경
  const handleContractItemRemarkChange = useCallback((itemId: string, remark: string) => {
    setFormData((prev) => ({
      ...prev,
      contractItems: prev.contractItems.map((item) =>
        item.id === itemId ? { ...item, remark } : item
      ),
    }));
  }, []);

  // 폼 내용 렌더링 함수 (IntegratedDetailTemplate용)
  const renderFormContent = () => (
    <div className="space-y-6">
        {/* 인수인계 정보 */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg">인수인계 정보</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
              {/* 보고서번호 */}
              <div className="space-y-2">
                <Label>보고서번호</Label>
                <Input
                  value={formData.reportNumber}
                  onChange={(e) => handleFieldChange('reportNumber', e.target.value)}
                  disabled={isViewMode}
                />
              </div>

              {/* 계약담당자 */}
              <div className="space-y-2">
                <Label>계약담당자</Label>
                <Input
                  value={formData.contractManagerName}
                  onChange={(e) => handleFieldChange('contractManagerName', e.target.value)}
                  disabled={isViewMode}
                />
              </div>

              {/* 거래처명 */}
              <div className="space-y-2">
                <Label>거래처명</Label>
                <Input
                  value={formData.partnerName}
                  onChange={(e) => handleFieldChange('partnerName', e.target.value)}
                  disabled={isViewMode}
                />
              </div>

              {/* 현장명 */}
              <div className="space-y-2">
                <Label>회사명</Label>
                <Input
                  value={formData.siteName}
                  onChange={(e) => handleFieldChange('siteName', e.target.value)}
                  disabled={isViewMode}
                />
              </div>

              {/* 계약일자 */}
              <div className="space-y-2">
                <Label>계약일자</Label>
                <DatePicker
                  value={formData.contractDate}
                  onChange={(date) => handleFieldChange('contractDate', date)}
                  disabled={isViewMode}
                />
              </div>

              {/* 개소 */}
              <div className="space-y-2">
                <Label>개소</Label>
                <QuantityInput
                  value={formData.totalSites}
                  onChange={(value) => handleFieldChange('totalSites', value ?? 0)}
                  disabled={isViewMode}
                />
              </div>

              {/* 계약기간 */}
              <div className="space-y-2">
                <Label>계약기간</Label>
                <div className="flex items-center gap-2">
                  <DatePicker
                    value={formData.contractStartDate}
                    onChange={(date) => handleFieldChange('contractStartDate', date)}
                    disabled={isViewMode}
                  />
                  <span>~</span>
                  <DatePicker
                    value={formData.contractEndDate}
                    onChange={(date) => handleFieldChange('contractEndDate', date)}
                    disabled={isViewMode}
                  />
                </div>
              </div>

              {/* 계약금액 (공급가액) */}
              <div className="space-y-2">
                <Label>계약금액 (공급가액)</Label>
                <Input
                  type="text"
                  value={formatNumber(formData.contractAmount)}
                  onChange={(e) => {
                    const value = e.target.value.replace(/[^0-9]/g, '');
                    handleFieldChange('contractAmount', parseInt(value) || 0);
                  }}
                  disabled={isViewMode}
                />
              </div>

              {/* 공사PM */}
              <div className="space-y-2">
                <Label>공사PM</Label>
                <Select
                  value={formData.constructionPMId}
                  onValueChange={(value) => {
                    handleFieldChange('constructionPMId', value);
                    const pm = CONSTRUCTION_PM_OPTIONS.find((p) => p.value === value);
                    if (pm) {
                      handleFieldChange('constructionPMName', pm.label);
                    }
                  }}
                  disabled={isViewMode}
                >
                  <SelectTrigger>
                    <SelectValue placeholder="선택" />
                  </SelectTrigger>
                  <SelectContent>
                    {CONSTRUCTION_PM_OPTIONS.map((option) => (
                      <SelectItem key={option.value} value={option.value}>
                        {option.label}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>

              {/* 상태 */}
              <div className="space-y-2">
                <Label>상태</Label>
                <RadioGroup
                  value={formData.status}
                  onValueChange={(value) => handleFieldChange('status', value as HandoverStatus)}
                  disabled={isViewMode}
                  className="flex gap-4"
                >
                  <div className="flex items-center space-x-2">
                    <RadioGroupItem value="pending" id="pending" />
                    <Label htmlFor="pending" className="font-normal cursor-pointer">
                      {HANDOVER_STATUS_LABELS.pending}
                    </Label>
                  </div>
                  <div className="flex items-center space-x-2">
                    <RadioGroupItem value="completed" id="completed" />
                    <Label htmlFor="completed" className="font-normal cursor-pointer">
                      {HANDOVER_STATUS_LABELS.completed}
                    </Label>
                  </div>
                </RadioGroup>
              </div>
            </div>
          </CardContent>
        </Card>

        {/* 공사담당자 */}
        <Card>
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-4">
            <CardTitle className="text-lg">공사담당자</CardTitle>
            {isEditMode && (
              <Button variant="outline" size="sm" onClick={handleAddManager}>
                <Plus className="h-4 w-4 mr-1" />
                추가
              </Button>
            )}
          </CardHeader>
          <CardContent>
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead className="w-[60px] text-center">번호</TableHead>
                  <TableHead className="w-[200px]">공사담당자</TableHead>
                  <TableHead>미이행 사유</TableHead>
                  {isEditMode && <TableHead className="w-[60px]"></TableHead>}
                </TableRow>
              </TableHeader>
              <TableBody>
                {formData.constructionManagers.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={isEditMode ? 4 : 3} className="text-center text-muted-foreground py-8">
                      등록된 공사담당자가 없습니다.
                    </TableCell>
                  </TableRow>
                ) : (
                  formData.constructionManagers.map((manager, index) => (
                    <TableRow key={manager.id}>
                      <TableCell className="text-center">{index + 1}</TableCell>
                      <TableCell>
                        {isEditMode ? (
                          <Select
                            value={manager.name}
                            onValueChange={(value) => handleManagerChange(manager.id, 'name', value)}
                          >
                            <SelectTrigger className="min-w-[150px] w-auto">
                              <SelectValue placeholder="이름" />
                            </SelectTrigger>
                            <SelectContent>
                              {MANAGER_OPTIONS.map((option) => (
                                <SelectItem key={option.value} value={option.label}>
                                  {option.label}
                                </SelectItem>
                              ))}
                            </SelectContent>
                          </Select>
                        ) : (
                          manager.name
                        )}
                      </TableCell>
                      <TableCell>
                        {isEditMode ? (
                          <Input
                            value={manager.nonPerformanceReason}
                            onChange={(e) =>
                              handleManagerChange(manager.id, 'nonPerformanceReason', e.target.value)
                            }
                            placeholder="미이행 사유 입력"
                          />
                        ) : (
                          manager.nonPerformanceReason || '-'
                        )}
                      </TableCell>
                      {isEditMode && (
                        <TableCell className="text-center">
                          <Button
                            variant="ghost"
                            size="icon"
                            className="h-8 w-8"
                            onClick={() => handleRemoveManager(manager.id)}
                          >
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        </TableCell>
                      )}
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
          </CardContent>
        </Card>

        {/* 계약 ITEM */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg">계약 ITEM</CardTitle>
          </CardHeader>
          <CardContent>
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead className="w-[60px] text-center">번호</TableHead>
                  <TableHead>명칭</TableHead>
                  <TableHead>제품</TableHead>
                  <TableHead className="text-right">수량</TableHead>
                  <TableHead>비고</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {formData.contractItems.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={5} className="text-center text-muted-foreground py-8">
                      등록된 계약 ITEM이 없습니다.
                    </TableCell>
                  </TableRow>
                ) : (
                  formData.contractItems.map((item) => (
                    <TableRow key={item.id}>
                      <TableCell className="text-center">{item.no}</TableCell>
                      <TableCell>{item.name}</TableCell>
                      <TableCell>{item.product}</TableCell>
                      <TableCell className="text-right">{formatNumber(item.quantity)}</TableCell>
                      <TableCell>
                        {isEditMode ? (
                          <Input
                            value={item.remark}
                            onChange={(e) => handleContractItemRemarkChange(item.id, e.target.value)}
                            placeholder="비고 입력"
                          />
                        ) : (
                          item.remark || '-'
                        )}
                      </TableCell>
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
          </CardContent>
        </Card>

        {/* 상세 정보 */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg">상세 정보</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="space-y-6">
              {/* 2차 배관 유무 / 도장 & 코킹 유무 */}
              <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
                {/* 2차 배관 유무 */}
                <div className="space-y-2">
                  <Label>2차 배관 유무</Label>
                  <div className="flex items-center gap-4">
                    <RadioGroup
                      value={formData.hasSecondaryPiping ? 'included' : 'not_included'}
                      onValueChange={(value) => {
                        handleFieldChange('hasSecondaryPiping', value === 'included');
                        if (value !== 'included') {
                          handleFieldChange('secondaryPipingNote', '');
                        }
                      }}
                      disabled={isViewMode}
                      className="flex gap-4 shrink-0"
                    >
                      <div className="flex items-center space-x-2">
                        <RadioGroupItem value="not_included" id="piping_not" />
                        <Label htmlFor="piping_not" className="font-normal cursor-pointer">
                          미포함
                        </Label>
                      </div>
                      <div className="flex items-center space-x-2">
                        <RadioGroupItem value="included" id="piping_yes" />
                        <Label htmlFor="piping_yes" className="font-normal cursor-pointer">
                          포함
                        </Label>
                      </div>
                    </RadioGroup>
                    <Input
                      value={formData.secondaryPipingNote}
                      onChange={(e) => handleFieldChange('secondaryPipingNote', e.target.value)}
                      disabled={isViewMode || !formData.hasSecondaryPiping}
                      placeholder="2차 배관 내용 입력"
                      className={`flex-1 transition-opacity duration-200 ${
                        formData.hasSecondaryPiping ? 'opacity-100' : 'opacity-0 pointer-events-none'
                      }`}
                    />
                  </div>
                </div>

                {/* 도장 & 코킹 유무 */}
                <div className="space-y-2">
                  <Label>도장 & 코킹 유무</Label>
                  <div className="flex items-center gap-4">
                    <RadioGroup
                      value={formData.hasCoating ? 'included' : 'not_included'}
                      onValueChange={(value) => {
                        handleFieldChange('hasCoating', value === 'included');
                        if (value !== 'included') {
                          handleFieldChange('coatingNote', '');
                        }
                      }}
                      disabled={isViewMode}
                      className="flex gap-4 shrink-0"
                    >
                      <div className="flex items-center space-x-2">
                        <RadioGroupItem value="not_included" id="coating_not" />
                        <Label htmlFor="coating_not" className="font-normal cursor-pointer">
                          미포함
                        </Label>
                      </div>
                      <div className="flex items-center space-x-2">
                        <RadioGroupItem value="included" id="coating_yes" />
                        <Label htmlFor="coating_yes" className="font-normal cursor-pointer">
                          포함
                        </Label>
                      </div>
                    </RadioGroup>
                    <Input
                      value={formData.coatingNote}
                      onChange={(e) => handleFieldChange('coatingNote', e.target.value)}
                      disabled={isViewMode || !formData.hasCoating}
                      placeholder="도장 & 코킹 내용 입력"
                      className={`flex-1 transition-opacity duration-200 ${
                        formData.hasCoating ? 'opacity-100' : 'opacity-0 pointer-events-none'
                      }`}
                    />
                  </div>
                </div>
              </div>

              {/* 장비 외 실행금액 */}
              <div className="space-y-2">
                <Label>장비 외 실행금액</Label>
                <div className="flex flex-wrap items-center gap-4">
                  <div className="flex items-center gap-2">
                    <Checkbox
                      checked={formData.externalEquipmentCost.shippingCost > 0}
                      onCheckedChange={(checked) =>
                        handleEquipmentCostChange('shippingCost', checked ? 1500000 : 0)
                      }
                      disabled={isViewMode}
                    />
                    <Label className="font-normal">운반비</Label>
                  </div>
                  <div className="flex items-center gap-2">
                    <Checkbox
                      checked={formData.externalEquipmentCost.highAltitudeWork > 0}
                      onCheckedChange={(checked) =>
                        handleEquipmentCostChange('highAltitudeWork', checked ? 800000 : 0)
                      }
                      disabled={isViewMode}
                    />
                    <Label className="font-normal">고소작업대</Label>
                  </div>
                  <div className="flex items-center gap-2">
                    <Checkbox
                      checked={formData.externalEquipmentCost.publicExpense > 0}
                      onCheckedChange={(checked) =>
                        handleEquipmentCostChange('publicExpense', checked ? 10000000 : 0)
                      }
                      disabled={isViewMode}
                    />
                    <Label className="font-normal">공과잡</Label>
                  </div>
                </div>
              </div>

              {/* 특이사항 */}
              <div className="space-y-2">
                <Label>특이사항</Label>
                <Textarea
                  value={formData.specialNotes}
                  onChange={(e) => handleFieldChange('specialNotes', e.target.value)}
                  disabled={isViewMode}
                  rows={4}
                  placeholder="특이사항을 입력하세요"
                />
              </div>

              {/* 녹음 버튼 */}
              {isEditMode && (
                <div className="flex justify-end">
                  <Button variant="outline">녹음</Button>
                </div>
              )}
            </div>
          </CardContent>
        </Card>
    </div>
  );

  return (
    <>
      <IntegratedDetailTemplate
        config={handoverReportConfig}
        mode={mode}
        initialData={{}}
        itemId={reportId}
        isLoading={false}
        onSubmit={handleSubmit}
        onDelete={isViewMode ? handleDelete : undefined}
        headerActions={customHeaderActions}
        renderView={() => renderFormContent()}
        renderForm={() => renderFormContent()}
      />

      {/* 인수인계보고서 보기 모달 (특수 기능) */}
      {initialData && (
        <HandoverReportDocumentModal
          open={showDocumentModal}
          onOpenChange={setShowDocumentModal}
          report={initialData}
        />
      )}

      {/* 전자결재 모달 (특수 기능) */}
      <ElectronicApprovalModal
        isOpen={showApprovalModal}
        onClose={() => setShowApprovalModal(false)}
        approval={approvalData}
        onSave={handleApprovalSave}
      />
    </>
  );
}