/**
 * 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);

    return {
      id: comp.id,
      componentType: componentType,
      widgetType: componentType,
      type: "component",
      position: comp.position,
      size: comp.size,
      componentConfig: mergedConfig,
      // 기존 구조 호환을 위한 추가 필드
      label: mergedConfig.label || componentType,
      style: {},
      parentId: null,
      gridColumns: 12,
      gridRowIndex: 0,
    };
  });

  return {
    components,
    gridSettings: {
      enabled: true,
      size: 20,
      color: "#d1d5db",
      opacity: 0.5,
      snapToGrid: true,
      columns: 12,
      gap: 16,
      padding: 16,
    },
    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);
    
    // 현재 설정에서 차이값만 추출
    const fullConfig = comp.componentConfig || {};
    const overrides = extractCustomConfig(fullConfig, defaults);

    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"
  );
}