/**
 * 거래처 등록/수정 컴포넌트
 *
 * IntegratedDetailTemplate 마이그레이션 (2026-01-20)
 * - 데스크톱/태블릿/모바일 통합 폼 레이아웃
 * - 섹션 기반 정보 입력
 * - 유효성 검사 및 에러 표시
 */

'use client';

import { useState, useEffect, useCallback } from 'react';
import { Input } from '../ui/input';
import { Textarea } from '../ui/textarea';
import { RadioGroup, RadioGroupItem } from '../ui/radio-group';
import { Label } from '../ui/label';
import { Building2, UserCircle, Phone, FileText } from 'lucide-react';
import { toast } from 'sonner';
import { Alert, AlertDescription } from '../ui/alert';
import { IntegratedDetailTemplate } from '@/components/templates/IntegratedDetailTemplate';
import { clientCreateConfig, clientEditConfig } from './clientConfig';
import { FormSection } from '../organisms/FormSection';
import { FormFieldGrid } from '../organisms/FormFieldGrid';
import { FormField } from '../molecules/FormField';
import {
  ClientFormData,
  INITIAL_CLIENT_FORM,
  ClientType,
} from '../../hooks/useClientList';

// 필드명 매핑
const FIELD_NAME_MAP: Record<string, string> = {
  name: '거래처명',
  businessNo: '사업자등록번호',
  representative: '대표자명',
  phone: '전화번호',
  email: '이메일',
};

interface ClientRegistrationProps {
  onBack: () => void;
  onSave: (client: ClientFormData) => Promise<void>;
  editingClient?: ClientFormData | null;
  isLoading?: boolean;
}

// 4자리 영문+숫자 조합 코드 생성 (중복 방지를 위해 타임스탬프 기반)
const generateClientCode = (): string => {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  const timestamp = Date.now().toString(36).toUpperCase().slice(-2); // 타임스탬프 2자리
  let random = '';
  for (let i = 0; i < 2; i++) {
    random += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return timestamp + random;
};

export function ClientRegistration({
  onBack,
  onSave,
  editingClient,
  isLoading = false,
}: ClientRegistrationProps) {
  const [formData, setFormData] = useState<ClientFormData>(() => {
    if (editingClient) {
      return editingClient;
    }
    // 신규 등록 시 클라이언트 코드 자동 생성
    return {
      ...INITIAL_CLIENT_FORM,
      clientCode: generateClientCode(),
    };
  });
  const [errors, setErrors] = useState<Record<string, string>>({});
  const [isSaving, setIsSaving] = useState(false);

  const isEditMode = !!editingClient;

  // editingClient가 변경되면 formData 업데이트
  useEffect(() => {
    if (editingClient) {
      setFormData(editingClient);
    }
  }, [editingClient]);

  // 유효성 검사
  const validateForm = (): boolean => {
    const newErrors: Record<string, string> = {};

    if (!formData.name || formData.name.length < 2) {
      newErrors.name = '거래처명은 2자 이상 입력해주세요';
    }

    // 하이픈 제거 후 10자리 숫자 검증 (123-45-67890 또는 1234567890 허용)
    const businessNoDigits = formData.businessNo.replace(/-/g, '').trim();
    if (!formData.businessNo || !/^\d{10}$/.test(businessNoDigits)) {
      newErrors.businessNo = '사업자등록번호는 10자리 숫자여야 합니다';
    }

    if (!formData.representative || formData.representative.length < 2) {
      newErrors.representative = '대표자명은 2자 이상 입력해주세요';
    }

    // 전화번호 형식 검사 (선택적)
    const phonePattern = /^[0-9-]+$/;
    if (formData.phone && !phonePattern.test(formData.phone)) {
      newErrors.phone = '올바른 전화번호 형식이 아닙니다';
    }

    if (formData.email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(formData.email)) {
      newErrors.email = '올바른 이메일 형식이 아닙니다';
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleSubmit = useCallback(async () => {
    if (!validateForm()) {
      // 페이지 상단으로 스크롤
      window.scrollTo({ top: 0, behavior: 'smooth' });
      return;
    }

    // 에러 초기화
    setErrors({});
    setIsSaving(true);
    try {
      await onSave(formData);
      toast.success(
        editingClient ? '거래처가 수정되었습니다.' : '거래처가 등록되었습니다.'
      );
      onBack();
    } catch (error) {
      toast.error('저장 중 오류가 발생했습니다.');
    } finally {
      setIsSaving(false);
    }
  }, [formData, editingClient, onSave, onBack]);

  const handleFieldChange = (
    field: keyof ClientFormData,
    value: string | boolean
  ) => {
    setFormData({ ...formData, [field]: value });
    if (errors[field]) {
      setErrors((prev) => {
        const newErrors = { ...prev };
        delete newErrors[field];
        return newErrors;
      });
    }
  };

  // Config 선택
  const config = isEditMode ? clientEditConfig : clientCreateConfig;

  // 폼 콘텐츠 렌더링
  const renderFormContent = useCallback(
    () => (
      <div className="space-y-6 max-w-4xl">
        {/* Validation 에러 표시 */}
        {Object.keys(errors).length > 0 && (
          <Alert className="bg-red-50 border-red-200">
            <AlertDescription className="text-red-900">
              <div className="flex items-start gap-2">
                <span className="text-lg">⚠️</span>
                <div className="flex-1">
                  <strong className="block mb-2">
                    입력 내용을 확인해주세요 ({Object.keys(errors).length}개 오류)
                  </strong>
                  <ul className="space-y-1 text-sm">
                    {Object.entries(errors).map(([field, message]) => {
                      const fieldName = FIELD_NAME_MAP[field] || field;
                      return (
                        <li key={field} className="flex items-start gap-1">
                          <span>•</span>
                          <span>
                            <strong>{fieldName}</strong>: {message}
                          </span>
                        </li>
                      );
                    })}
                  </ul>
                </div>
              </div>
            </AlertDescription>
          </Alert>
        )}

        {/* 1. 기본 정보 */}
        <FormSection
          title="기본 정보"
          description="거래처의 기본 정보를 입력하세요"
          icon={Building2}
        >
          <FormFieldGrid columns={2}>
            <FormField
              label="사업자등록번호"
              required
              error={errors.businessNo}
              htmlFor="businessNo"
              type="custom"
            >
              <Input
                id="businessNo"
                placeholder="10자리 숫자 (예: 123-45-67890)"
                value={formData.businessNo}
                onChange={(e) => handleFieldChange('businessNo', e.target.value)}
              />
            </FormField>

            <FormField
              label="거래처 코드"
              htmlFor="clientCode"
              helpText="자동 생성됩니다"
              type="custom"
            >
              <Input
                id="clientCode"
                placeholder="자동생성"
                value={formData.clientCode || ''}
                disabled
              />
            </FormField>
          </FormFieldGrid>

          <FormFieldGrid columns={2}>
            <FormField
              label="거래처명"
              required
              error={errors.name}
              htmlFor="name"
              type="custom"
            >
              <Input
                id="name"
                placeholder="거래처명 입력"
                value={formData.name}
                onChange={(e) => handleFieldChange('name', e.target.value)}
              />
            </FormField>

            <FormField
              label="대표자명"
              required
              error={errors.representative}
              htmlFor="representative"
              type="custom"
            >
              <Input
                id="representative"
                placeholder="대표자명 입력"
                value={formData.representative}
                onChange={(e) =>
                  handleFieldChange('representative', e.target.value)
                }
              />
            </FormField>
          </FormFieldGrid>

          <FormField label="거래처 유형" required type="custom">
            <RadioGroup
              value={formData.clientType}
              onValueChange={(value) =>
                handleFieldChange('clientType', value as ClientType)
              }
              className="flex gap-4"
            >
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="매입" id="type-purchase" />
                <Label htmlFor="type-purchase">매입</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="매출" id="type-sales" />
                <Label htmlFor="type-sales">매출</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="매입매출" id="type-both" />
                <Label htmlFor="type-both">매입매출</Label>
              </div>
            </RadioGroup>
          </FormField>

          <FormFieldGrid columns={2}>
            <FormField label="업태" htmlFor="businessType" type="custom">
              <Input
                id="businessType"
                placeholder="제조업, 도소매업 등"
                value={formData.businessType}
                onChange={(e) =>
                  handleFieldChange('businessType', e.target.value)
                }
              />
            </FormField>

            <FormField label="종목" htmlFor="businessItem" type="custom">
              <Input
                id="businessItem"
                placeholder="철강, 건설 등"
                value={formData.businessItem}
                onChange={(e) =>
                  handleFieldChange('businessItem', e.target.value)
                }
              />
            </FormField>
          </FormFieldGrid>
        </FormSection>

        {/* 2. 연락처 정보 */}
        <FormSection
          title="연락처 정보"
          description="거래처의 연락처 정보를 입력하세요"
          icon={Phone}
        >
          <FormField label="주소" htmlFor="address" type="custom">
            <Input
              id="address"
              placeholder="주소 입력"
              value={formData.address}
              onChange={(e) => handleFieldChange('address', e.target.value)}
            />
          </FormField>

          <FormFieldGrid columns={3}>
            <FormField
              label="전화번호"
              error={errors.phone}
              htmlFor="phone"
              type="custom"
            >
              <Input
                id="phone"
                placeholder="02-1234-5678"
                value={formData.phone}
                onChange={(e) => handleFieldChange('phone', e.target.value)}
              />
            </FormField>

            <FormField label="모바일" htmlFor="mobile" type="custom">
              <Input
                id="mobile"
                placeholder="010-1234-5678"
                value={formData.mobile}
                onChange={(e) => handleFieldChange('mobile', e.target.value)}
              />
            </FormField>

            <FormField label="팩스" htmlFor="fax" type="custom">
              <Input
                id="fax"
                placeholder="02-1234-5678"
                value={formData.fax}
                onChange={(e) => handleFieldChange('fax', e.target.value)}
              />
            </FormField>
          </FormFieldGrid>

          <FormField
            label="이메일"
            error={errors.email}
            htmlFor="email"
            type="custom"
          >
            <Input
              id="email"
              type="email"
              placeholder="example@company.com"
              value={formData.email}
              onChange={(e) => handleFieldChange('email', e.target.value)}
            />
          </FormField>
        </FormSection>

        {/* 3. 담당자 정보 */}
        <FormSection
          title="담당자 정보"
          description="거래처 담당자 정보를 입력하세요"
          icon={UserCircle}
        >
          <FormFieldGrid columns={2}>
            <FormField label="담당자명" htmlFor="managerName" type="custom">
              <Input
                id="managerName"
                placeholder="담당자명 입력"
                value={formData.managerName}
                onChange={(e) => handleFieldChange('managerName', e.target.value)}
              />
            </FormField>

            <FormField label="담당자 전화" htmlFor="managerTel" type="custom">
              <Input
                id="managerTel"
                placeholder="010-1234-5678"
                value={formData.managerTel}
                onChange={(e) => handleFieldChange('managerTel', e.target.value)}
              />
            </FormField>
          </FormFieldGrid>

          <FormField label="시스템 관리자" htmlFor="systemManager" type="custom">
            <Input
              id="systemManager"
              placeholder="시스템 관리자명"
              value={formData.systemManager}
              onChange={(e) =>
                handleFieldChange('systemManager', e.target.value)
              }
            />
          </FormField>
        </FormSection>

        {/* 4. 기타 */}
        <FormSection
          title="기타 정보"
          description="추가 정보를 입력하세요"
          icon={FileText}
        >
          <FormField label="메모" htmlFor="memo" type="custom">
            <Textarea
              id="memo"
              placeholder="메모 입력"
              value={formData.memo}
              onChange={(e) => handleFieldChange('memo', e.target.value)}
              rows={4}
            />
          </FormField>

          <FormField label="상태" type="custom">
            <RadioGroup
              value={formData.isActive ? '활성' : '비활성'}
              onValueChange={(value) =>
                handleFieldChange('isActive', value === '활성')
              }
              className="flex gap-4"
            >
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="활성" id="status-active" />
                <Label htmlFor="status-active">활성</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="비활성" id="status-inactive" />
                <Label htmlFor="status-inactive">비활성</Label>
              </div>
            </RadioGroup>
          </FormField>
        </FormSection>
      </div>
    ),
    [formData, errors, handleFieldChange]
  );

  return (
    <IntegratedDetailTemplate
      config={config}
      mode={isEditMode ? 'edit' : 'create'}
      isLoading={isLoading}
      isSubmitting={isSaving}
      onBack={onBack}
      onCancel={onBack}
      onSubmit={handleSubmit}
      renderForm={renderFormContent}
    />
  );
}