// 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
};

/**
 * API field_type → Frontend field_type 변환
 * API: 'textbox' | 'number' | 'dropdown' | 'checkbox' | 'date' | 'textarea'
 * Frontend: 'TEXT' | 'NUMBER' | 'DATE' | 'SELECT' | 'TEXTAREA' | 'CHECKBOX'
 */
const FIELD_TYPE_MAP: Record<
  string,
  'TEXT' | 'NUMBER' | 'DATE' | 'SELECT' | 'TEXTAREA' | 'CHECKBOX'
> = {
  textbox: 'TEXT',
  number: 'NUMBER',
  dropdown: 'SELECT',
  checkbox: 'CHECKBOX',
  date: 'DATE',
  textarea: 'TEXTAREA',
};

/**
 * Frontend field_type → API field_type 변환
 */
const FIELD_TYPE_REVERSE_MAP: Record<
  string,
  'textbox' | 'number' | 'dropdown' | 'checkbox' | 'date' | 'textarea'
> = {
  TEXT: 'textbox',
  NUMBER: 'number',
  SELECT: 'dropdown',
  CHECKBOX: 'checkbox',
  DATE: 'date',
  TEXTAREA: 'textarea',
};

// ============================================
// 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',
    absolute_path: response.absolute_path,
    is_active: response.is_active,
    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)
 */
export const transformSectionResponse = (
  response: ItemSectionResponse
): ItemSection => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    page_id: response.page_id,
    title: response.title,
    section_type: SECTION_TYPE_MAP[response.type] || 'BASIC', // 타입 값 변환
    order_no: response.order_no,
    fields: response.fields?.map(transformFieldResponse) || [],
    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
 * 주요 변환: field_type 값 변환 (textbox → TEXT, dropdown → SELECT 등)
 */
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_type: FIELD_TYPE_MAP[response.field_type] || 'TEXT', // 타입 값 변환
    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
 * 주요 변환: field_type 값 변환 (textbox → TEXT, dropdown → SELECT 등)
 */
export const transformMasterFieldResponse = (
  response: MasterFieldResponse
): ItemMasterField => {
  return {
    id: response.id,
    tenant_id: response.tenant_id,
    field_name: response.field_name,
    field_type: FIELD_TYPE_MAP[response.field_type] || 'TEXT', // 타입 값 변환
    category: response.category,
    description: response.description,
    default_validation: response.validation_rules, // 필드명 매핑
    default_properties: response.properties, // 필드명 매핑
    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
 * 주요 변환: field_type 값 역변환 (TEXT → textbox, SELECT → dropdown 등)
 */
export const transformFieldToRequest = (field: Partial<ItemField>) => {
  return {
    field_name: field.field_name || '',
    field_type: field.field_type
      ? FIELD_TYPE_REVERSE_MAP[field.field_type] || 'textbox'
      : 'textbox',
    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
 * 주요 변환: field_type 값 역변환, default_validation/properties 필드명 변환
 */
export const transformMasterFieldToRequest = (
  field: Partial<ItemMasterField>
) => {
  return {
    field_name: field.field_name || '',
    field_type: field.field_type
      ? FIELD_TYPE_REVERSE_MAP[field.field_type] || 'textbox'
      : 'textbox',
    category: field.category || undefined,
    description: field.description || undefined,
    is_common: false, // 기본값
    default_value: undefined,
    options: undefined,
    validation_rules: field.default_validation || undefined, // 필드명 역변환
    properties: field.default_properties || undefined, // 필드명 역변환
  };
};

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

/**
 * 여러 페이지 응답을 한번에 변환
 */
export const transformPagesResponse = (
  responses: ItemPageResponse[]
): ItemPage[] => {
  return responses.map(transformPageResponse);
};

/**
 * 여러 섹션 응답을 한번에 변환
 */
export const transformSectionsResponse = (
  responses: ItemSectionResponse[]
): ItemSection[] => {
  return responses.map(transformSectionResponse);
};

/**
 * 여러 필드 응답을 한번에 변환
 */
export const transformFieldsResponse = (
  responses: ItemFieldResponse[]
): ItemField[] => {
  return responses.map(transformFieldResponse);
};

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

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

/**
 * 여러 마스터 필드 응답을 한번에 변환
 */
export const transformMasterFieldsResponse = (
  responses: MasterFieldResponse[]
): ItemMasterField[] => {
  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[]
) => {
  return responses.map(transformUnitOptionResponse);
};

/**
 * 여러 커스텀 탭 응답을 한번에 변환
 */
export const transformCustomTabsResponse = (
  responses: CustomTabResponse[]
) => {
  return responses.map(transformCustomTabResponse);
};