// API 응답 데이터 변환 헬퍼
// API 응답 (snake_case + 특정 값) ↔ Frontend State (snake_case + 변환된 값)

import type {
  ItemPageResponse,
  ItemSectionResponse,
  ItemFieldResponse,
  BomItemResponse,
  SectionTemplateResponse,
  MasterFieldResponse,
  UnitOptionResponse,
  CustomTabResponse,
} from '@/types/item-master-api';

import type {
  ItemPage,
  ItemSection,
  ItemField,
  BOMItem,
  SectionTemplate,
  ItemMasterField,
} from '@/contexts/ItemMasterContext';

// ============================================
// 타입 값 변환 매핑
// ============================================

/**
 * API section type → Frontend section_type 변환
 * API: 'fields' | 'bom'
 * Frontend: 'BASIC' | 'BOM' | 'CUSTOM'
 */
const SECTION_TYPE_MAP: Record<string, 'BASIC' | 'BOM' | 'CUSTOM'> = {
  fields: 'BASIC',
  bom: 'BOM',
};

/**
 * Frontend section_type → API section type 변환
 */
const SECTION_TYPE_REVERSE_MAP: Record<string, 'fields' | 'bom'> = {
  BASIC: 'fields',
  BOM: 'bom',
  CUSTOM: 'fields', // CUSTOM은 fields로 매핑
};

// 2025-11-26: field_type은 API와 Frontend가 동일한 값을 사용하므로 변환 불필요
// API & Frontend: 'textbox' | 'number' | 'dropdown' | 'checkbox' | 'date' | 'textarea'
type FieldType = 'textbox' | 'number' | 'dropdown' | 'checkbox' | 'date' | 'textarea';

/**
 * field_type 기본값 반환 (알 수 없는 값일 경우)
 */
const getFieldType = (type: string): FieldType => {
  const validTypes: FieldType[] = ['textbox', 'number', 'dropdown', 'checkbox', 'date', 'textarea'];
  return validTypes.includes(type as FieldType) ? (type as FieldType) : 'textbox';
};

// ============================================
// API Response → Frontend State 변환
// ============================================

/**
 * ItemPageResponse → ItemPage 변환
 */
export const transformPageResponse = (
  response: ItemPageResponse
): ItemPage => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    page_name: response.page_name,
    item_type: response.item_type as 'FG' | 'PT' | 'SM' | 'RM' | 'CS',
    description: response.description ?? null, // 2025-11-26 추가
    absolute_path: response.absolute_path || '', // null일 경우 빈 문자열
    is_active: response.is_active,
    order_no: response.order_no ?? 0, // 2025-11-26 추가
    sections: response.sections?.map(transformSectionResponse) || [],
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

/**
 * ItemSectionResponse → ItemSection 변환
 * 주요 변환: type → section_type, 값 변환 (fields → BASIC, bom → BOM)
 * 2025-11-26: group_id, is_template, is_default, description 추가 (section_templates 통합)
 */
export const transformSectionResponse = (
  response: ItemSectionResponse
): ItemSection => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    group_id: response.group_id, // 2025-11-26 추가: 독립 섹션 그룹화용
    page_id: response.page_id, // null이면 독립 섹션
    title: response.title,
    section_type: SECTION_TYPE_MAP[response.type] || 'BASIC', // 타입 값 변환
    description: response.description, // 2025-11-26 추가
    order_no: response.order_no,
    is_template: response.is_template, // 2025-11-26 추가: 템플릿 여부 (section_templates 통합)
    is_default: response.is_default, // 2025-11-26 추가: 기본 템플릿 여부
    fields: response.fields?.map(transformFieldResponse) || [],
    // 2025-11-27: 백엔드가 bom_items (snake_case)로 반환하므로 둘 다 체크
    bom_items: (response.bom_items || response.bomItems)?.map(transformBomItemResponse) || [],
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

/**
 * ItemFieldResponse → ItemField 변환
 * 2025-11-26: field_type은 API와 동일한 값 사용 (변환 불필요)
 */
export const transformFieldResponse = (
  response: ItemFieldResponse
): ItemField => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    section_id: response.section_id,
    field_name: response.field_name,
    field_key: response.field_key, // 2025-11-28: field_key 추가 (형식: {ID}_{사용자입력})
    field_type: getFieldType(response.field_type), // API와 동일한 타입
    order_no: response.order_no,
    is_required: response.is_required,
    placeholder: response.placeholder,
    default_value: response.default_value,
    display_condition: response.display_condition,
    validation_rules: response.validation_rules,
    options: response.options,
    properties: response.properties,
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

/**
 * BomItemResponse → BOMItem 변환
 */
export const transformBomItemResponse = (
  response: BomItemResponse
): BOMItem => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    section_id: response.section_id,
    item_code: response.item_code,
    item_name: response.item_name,
    quantity: response.quantity,
    unit: response.unit,
    unit_price: response.unit_price,
    total_price: response.total_price,
    spec: response.spec,
    note: response.note,
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

/**
 * SectionTemplateResponse → SectionTemplate 변환
 * 주요 변환: title → template_name, type → section_type, 값 변환
 */
export const transformSectionTemplateResponse = (
  response: SectionTemplateResponse
): SectionTemplate => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    template_name: response.title, // 필드명 변환
    section_type: SECTION_TYPE_MAP[response.type] || 'BASIC', // 타입 값 변환
    description: response.description,
    default_fields: null, // API 응답에 없으므로 null
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

/**
 * MasterFieldResponse → ItemMasterField 변환
 * 2025-11-26: field_type은 API와 동일한 값 사용, 속성명도 API와 통일
 */
export const transformMasterFieldResponse = (
  response: MasterFieldResponse
): ItemMasterField => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    field_name: response.field_name,
    field_key: response.field_key ?? null, // 2025-11-28: field_key 추가 (형식: {ID}_{사용자입력})
    field_type: getFieldType(response.field_type), // API와 동일한 타입
    category: response.category,
    description: response.description,
    is_common: response.is_common ?? false, // 공통 필드 여부
    default_value: response.default_value ?? null, // 기본값
    options: response.options ?? null, // dropdown 옵션
    validation_rules: response.validation_rules ?? null, // 검증 규칙
    properties: response.properties ?? null, // 추가 속성
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};

// ============================================
// Frontend State → API Request 변환
// ============================================

/**
 * ItemSection → ItemSectionRequest 변환
 * 주요 변환: section_type → type, 값 역변환 (BASIC → fields, BOM → bom)
 */
export const transformSectionToRequest = (
  section: Partial<ItemSection>
): { title: string; type: 'fields' | 'bom' } => {
  return {
    title: section.title || '',
    type: section.section_type
      ? SECTION_TYPE_REVERSE_MAP[section.section_type] || 'fields'
      : 'fields',
  };
};

/**
 * ItemField → ItemFieldRequest 변환
 * 2025-11-26: field_type은 API와 동일한 값 사용 (변환 불필요)
 */
export const transformFieldToRequest = (field: Partial<ItemField>) => {
  return {
    field_name: field.field_name || '',
    field_type: field.field_type || 'textbox', // API와 동일한 타입
    is_required: field.is_required ?? false,
    placeholder: field.placeholder || null,
    default_value: field.default_value || null,
    display_condition: field.display_condition || null,
    validation_rules: field.validation_rules || null,
    options: field.options || null,
    properties: field.properties || null,
  };
};

/**
 * BOMItem → BomItemRequest 변환
 */
export const transformBomItemToRequest = (bomItem: Partial<BOMItem>) => {
  return {
    item_code: bomItem.item_code || undefined,
    item_name: bomItem.item_name || '',
    quantity: bomItem.quantity || 0,
    unit: bomItem.unit || undefined,
    unit_price: bomItem.unit_price || undefined,
    total_price: bomItem.total_price || undefined,
    spec: bomItem.spec || undefined,
    note: bomItem.note || undefined,
  };
};

/**
 * SectionTemplate → SectionTemplateRequest 변환
 * 주요 변환: template_name → title, section_type → type, 값 역변환
 */
export const transformSectionTemplateToRequest = (
  template: Partial<SectionTemplate>
) => {
  return {
    title: template.template_name || '', // 필드명 역변환
    type: template.section_type
      ? SECTION_TYPE_REVERSE_MAP[template.section_type] || 'fields'
      : 'fields',
    description: template.description || undefined,
    is_default: false, // 기본값
  };
};

/**
 * ItemMasterField → MasterFieldRequest 변환
 * 2025-11-26: field_type과 속성명 모두 API와 동일하게 통일
 */
export const transformMasterFieldToRequest = (
  field: Partial<ItemMasterField>
) => {
  return {
    field_name: field.field_name || '',
    field_type: field.field_type || 'textbox', // API와 동일한 타입
    category: field.category || undefined,
    description: field.description || undefined,
    is_common: field.is_common ?? false,
    default_value: field.default_value || undefined,
    options: field.options || undefined,
    validation_rules: field.validation_rules || undefined, // API와 동일
    properties: field.properties || undefined, // API와 동일
  };
};

// ============================================
// 배치 변환 헬퍼
// ============================================

/**
 * 여러 페이지 응답을 한번에 변환
 */
export const transformPagesResponse = (
  responses: ItemPageResponse[] | undefined | null
): ItemPage[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformPageResponse);
};

/**
 * 여러 섹션 응답을 한번에 변환
 */
export const transformSectionsResponse = (
  responses: ItemSectionResponse[] | undefined | null
): ItemSection[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformSectionResponse);
};

/**
 * 여러 필드 응답을 한번에 변환
 */
export const transformFieldsResponse = (
  responses: ItemFieldResponse[] | undefined | null
): ItemField[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformFieldResponse);
};

/**
 * 여러 BOM 아이템 응답을 한번에 변환
 */
export const transformBomItemsResponse = (
  responses: BomItemResponse[] | undefined | null
): BOMItem[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformBomItemResponse);
};

/**
 * 여러 섹션 템플릿 응답을 한번에 변환
 */
export const transformSectionTemplatesResponse = (
  responses: SectionTemplateResponse[] | undefined | null
): SectionTemplate[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformSectionTemplateResponse);
};

/**
 * 여러 마스터 필드 응답을 한번에 변환
 */
export const transformMasterFieldsResponse = (
  responses: MasterFieldResponse[] | undefined | null
): ItemMasterField[] => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformMasterFieldResponse);
};

/**
 * UnitOptionResponse → MasterOption 변환 (Frontend의 MasterOption 타입에 맞춤)
 */
export const transformUnitOptionResponse = (
  response: UnitOptionResponse
): { id: string; value: string; label: string; isActive: boolean } => {
  return {
    id: response.id.toString(), // number → string 변환
    value: response.value,
    label: response.label,
    isActive: true, // API에 없으므로 기본값
  };
};

/**
 * CustomTabResponse → Frontend customTabs 타입 변환
 */
export const transformCustomTabResponse = (
  response: CustomTabResponse
): { id: string; label: string; icon: string; isDefault: boolean; order: number } => {
  return {
    id: response.id.toString(), // number → string 변환
    label: response.label,
    icon: response.icon || 'FileText', // null이면 기본 아이콘
    isDefault: response.is_default,
    order: response.order_no,
  };
};

/**
 * 여러 단위 옵션 응답을 한번에 변환
 */
export const transformUnitOptionsResponse = (
  responses: UnitOptionResponse[] | undefined | null
) => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformUnitOptionResponse);
};

/**
 * 여러 커스텀 탭 응답을 한번에 변환
 */
export const transformCustomTabsResponse = (
  responses: CustomTabResponse[] | undefined | null
) => {
  if (!responses || !Array.isArray(responses)) return [];
  return responses.map(transformCustomTabResponse);
};

/**
 * ItemSectionResponse → SectionTemplate 변환
 * 2025-11-26: 백엔드가 sectionTemplates 대신 sections를 반환하는 경우 사용
 * is_template=true인 섹션을 SectionTemplate 형식으로 변환
 */
export const transformSectionTemplateFromSection = (
  response: ItemSectionResponse
): SectionTemplate => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    template_name: response.title, // title → template_name
    section_type: SECTION_TYPE_MAP[response.type] || 'BASIC', // type → section_type
    description: response.description,
    default_fields: null, // API 응답에 없으므로 null
    // 필드 변환은 별도 처리 필요 (fields가 있으면 TemplateField로 변환)
    // 2025-11-28: fieldKey를 실제 field_key 사용하도록 수정 (기존: field_name에서 생성)
    fields: response.fields?.map(field => ({
      id: field.id.toString(),
      name: field.field_name,
      fieldKey: field.field_key || field.field_name.toLowerCase().replace(/\s+/g, '_'),
      property: {
        inputType: getFieldType(field.field_type),
        required: field.is_required,
        options: field.options?.map((opt: { label: string; value: string }) => opt.label || opt.value),
      },
      description: field.placeholder || undefined,
    })),
    bomItems: response.bomItems?.map(transformBomItemResponse),
    created_by: response.created_by,
    updated_by: response.updated_by,
    created_at: response.created_at,
    updated_at: response.updated_at,
  };
};