/**
 * V2 레이아웃 변환 유틸리티
 *
 * 기존 LayoutData ↔ V2 LayoutData 변환
 */

import {
  ComponentV2,
  LayoutV2,
  getComponentUrl,
  getComponentTypeFromUrl,
  getDefaultsByUrl,
  mergeComponentConfig,
  extractCustomConfig,
} from "@/lib/schemas/componentConfig";

// 기존 ComponentData 타입 (간략화)
interface LegacyComponentData {
  id: string;
  componentType?: string;
  widgetType?: string;
  type?: string;
  position?: { x: number; y: number };
  size?: { width: number; height: number };
  componentConfig?: Record<string, any>;
  [key: string]: any;
}

interface LegacyLayoutData {
  components: LegacyComponentData[];
  gridSettings?: any;
  screenResolution?: any;
  metadata?: any;
}

// ============================================
// V2 → Legacy 변환 (로드 시)
// ============================================
export function convertV2ToLegacy(v2Layout: LayoutV2 | null): LegacyLayoutData | null {
  if (!v2Layout || !v2Layout.components) {
    return null;
  }

  const components: LegacyComponentData[] = v2Layout.components.map((comp) => {
    const componentType = getComponentTypeFromUrl(comp.url);
    const defaults = getDefaultsByUrl(comp.url);
    const mergedConfig = mergeComponentConfig(defaults, comp.overrides);

    // 🆕 overrides에서 상위 레벨 속성들 추출
    const overrides = comp.overrides || {};

    return {
      id: comp.id,
      componentType: componentType,
      widgetType: componentType,
      type: "component",
      position: comp.position,
      size: comp.size,
      componentConfig: mergedConfig,
      // 🆕 상위 레벨 속성 복원 (테이블/컬럼 연결 정보)
      tableName: overrides.tableName,
      columnName: overrides.columnName,
      label: overrides.label || mergedConfig.label || "", // 라벨이 없으면 빈 문자열
      required: overrides.required,
      readonly: overrides.readonly,
      codeCategory: overrides.codeCategory,
      inputType: overrides.inputType,
      webType: overrides.webType,
      // 기존 구조 호환을 위한 추가 필드
      style: {},
      parentId: null,
      gridColumns: 12,
      gridRowIndex: 0,
    };
  });

  return {
    components,
    gridSettings: v2Layout.gridSettings || {
      enabled: true,
      size: 20,
      color: "#d1d5db",
      opacity: 0.5,
      snapToGrid: true,
      columns: 12,
      gap: 16,
      padding: 16,
    },
    screenResolution: v2Layout.screenResolution || {
      width: 1920,
      height: 1080,
    },
  };
}

// ============================================
// Legacy → V2 변환 (저장 시)
// ============================================
export function convertLegacyToV2(legacyLayout: LegacyLayoutData): LayoutV2 {
  const components: ComponentV2[] = legacyLayout.components.map((comp, index) => {
    // 컴포넌트 타입 결정
    const componentType = comp.componentType || comp.widgetType || comp.type || "unknown";
    const url = getComponentUrl(componentType);

    // 기본값 가져오기
    const defaults = getDefaultsByUrl(url);

    // 🆕 컴포넌트 상위 레벨 속성들도 포함 (tableName, columnName 등)
    const topLevelProps: Record<string, any> = {};
    if (comp.tableName) topLevelProps.tableName = comp.tableName;
    if (comp.columnName) topLevelProps.columnName = comp.columnName;
    if (comp.label) topLevelProps.label = comp.label;
    if (comp.required !== undefined) topLevelProps.required = comp.required;
    if (comp.readonly !== undefined) topLevelProps.readonly = comp.readonly;
    if (comp.codeCategory) topLevelProps.codeCategory = comp.codeCategory;
    if (comp.inputType) topLevelProps.inputType = comp.inputType;
    if (comp.webType) topLevelProps.webType = comp.webType;

    // 현재 설정에서 차이값만 추출
    const fullConfig = comp.componentConfig || {};
    const configOverrides = extractCustomConfig(fullConfig, defaults);

    // 상위 레벨 속성과 componentConfig 병합
    const overrides = { ...topLevelProps, ...configOverrides };

    return {
      id: comp.id,
      url: url,
      position: comp.position || { x: 0, y: 0 },
      size: comp.size || { width: 100, height: 100 },
      displayOrder: index,
      overrides: overrides,
    };
  });

  return {
    version: "2.0",
    components,
    updatedAt: new Date().toISOString(),
  };
}

// ============================================
// V2 레이아웃 유효성 검사
// ============================================
export function isValidV2Layout(data: any): data is LayoutV2 {
  return data && typeof data === "object" && data.version === "2.0" && Array.isArray(data.components);
}

// ============================================
// 기존 레이아웃인지 확인
// ============================================
export function isLegacyLayout(data: any): boolean {
  return data && typeof data === "object" && Array.isArray(data.components) && data.version !== "2.0";
}