import { Position, Size } from "@/types/screen";
import { GridSettings } from "@/types/screen-management";

// 🎯 10px 고정 격자 시스템
const GRID_SIZE = 10; // 고정값

export interface GridInfo {
  gridSize: number; // 항상 10px
  totalWidth: number;
  totalHeight: number;
}

/**
 * 격자 정보 계산 (단순화)
 */
export function calculateGridInfo(
  containerWidth: number,
  containerHeight: number,
  _gridSettings?: GridSettings, // 호환성 유지용 (사용 안 함)
): GridInfo {
  return {
    gridSize: GRID_SIZE,
    totalWidth: containerWidth,
    totalHeight: containerHeight,
  };
}

/**
 * 위치를 10px 격자에 맞춤
 */
export function snapToGrid(position: Position, _gridInfo: GridInfo, gridSettings: GridSettings): Position {
  if (!gridSettings.snapToGrid) {
    return position;
  }

  return {
    x: Math.round(position.x / GRID_SIZE) * GRID_SIZE,
    y: Math.round(position.y / GRID_SIZE) * GRID_SIZE,
    z: position.z,
  };
}

/**
 * 크기를 10px 격자에 맞춤
 */
export function snapSizeToGrid(size: Size, _gridInfo: GridInfo, gridSettings: GridSettings): Size {
  if (!gridSettings.snapToGrid) {
    return size;
  }

  return {
    width: Math.max(GRID_SIZE, Math.round(size.width / GRID_SIZE) * GRID_SIZE),
    height: Math.max(GRID_SIZE, Math.round(size.height / GRID_SIZE) * GRID_SIZE),
  };
}

/**
 * 격자 가이드라인 생성 (10px 간격)
 */
export function generateGridLines(
  containerWidth: number,
  containerHeight: number,
  _gridSettings?: GridSettings,
): {
  verticalLines: number[];
  horizontalLines: number[];
} {
  const verticalLines: number[] = [];
  for (let x = 0; x <= containerWidth; x += GRID_SIZE) {
    verticalLines.push(x);
  }

  const horizontalLines: number[] = [];
  for (let y = 0; y <= containerHeight; y += GRID_SIZE) {
    horizontalLines.push(y);
  }

  return {
    verticalLines,
    horizontalLines,
  };
}

/**
 * 컴포넌트가 격자 경계에 있는지 확인
 */
export function isOnGridBoundary(
  position: Position,
  size: Size,
  gridInfo: GridInfo,
  gridSettings: GridSettings,
  tolerance: number = 5,
): boolean {
  const snappedPos = snapToGrid(position, gridInfo, gridSettings);
  const snappedSize = snapSizeToGrid(size, gridInfo, gridSettings);

  const positionMatch =
    Math.abs(position.x - snappedPos.x) <= tolerance && Math.abs(position.y - snappedPos.y) <= tolerance;

  const sizeMatch =
    Math.abs(size.width - snappedSize.width) <= tolerance && Math.abs(size.height - snappedSize.height) <= tolerance;

  return positionMatch && sizeMatch;
}

/**
 * 그룹 내부 컴포넌트들을 격자에 맞게 정렬
 */
export function alignGroupChildrenToGrid(
  children: any[],
  groupPosition: Position,
  gridInfo: GridInfo,
  gridSettings: GridSettings,
): any[] {
  if (!gridSettings.snapToGrid || children.length === 0) return children;

  return children.map((child) => {
    const padding = 16;
    
    // 10px 단위로 스냅
    const snappedX = Math.max(padding, Math.round((child.position.x - padding) / GRID_SIZE) * GRID_SIZE + padding);
    const snappedY = Math.max(padding, Math.round((child.position.y - padding) / GRID_SIZE) * GRID_SIZE + padding);
    
    const snappedWidth = Math.max(GRID_SIZE, Math.round(child.size.width / GRID_SIZE) * GRID_SIZE);
    const snappedHeight = Math.max(GRID_SIZE, Math.round(child.size.height / GRID_SIZE) * GRID_SIZE);

    return {
      ...child,
      position: {
        x: snappedX,
        y: snappedY,
        z: child.position.z || 1,
      },
      size: {
        width: snappedWidth,
        height: snappedHeight,
      },
    };
  });
}

/**
 * 그룹 생성 시 최적화된 그룹 크기 계산
 */
export function calculateOptimalGroupSize(
  children: Array<{ position: Position; size: Size }>,
  _gridInfo?: GridInfo,
  _gridSettings?: GridSettings,
): Size {
  if (children.length === 0) {
    return { width: GRID_SIZE * 20, height: GRID_SIZE * 10 };
  }

  const bounds = children.reduce(
    (acc, child) => ({
      minX: Math.min(acc.minX, child.position.x),
      minY: Math.min(acc.minY, child.position.y),
      maxX: Math.max(acc.maxX, child.position.x + child.size.width),
      maxY: Math.max(acc.maxY, child.position.y + child.size.height),
    }),
    { minX: Infinity, minY: Infinity, maxX: -Infinity, maxY: -Infinity },
  );

  const contentWidth = bounds.maxX - bounds.minX;
  const contentHeight = bounds.maxY - bounds.minY;
  const padding = 16;

  return {
    width: contentWidth + padding * 2,
    height: contentHeight + padding * 2,
  };
}

/**
 * 그룹 내 상대 좌표를 격자 기준으로 정규화
 */
export function normalizeGroupChildPositions(children: any[], _gridSettings?: GridSettings): any[] {
  if (children.length === 0) return children;

  const minX = Math.min(...children.map((child) => child.position.x));
  const minY = Math.min(...children.map((child) => child.position.y));
  const padding = 16;

  return children.map((child) => ({
    ...child,
    position: {
      x: child.position.x - minX + padding,
      y: child.position.y - minY + padding,
      z: child.position.z || 1,
    },
  }));
}

// 🗑️ 제거된 함수들 (더 이상 필요 없음)
// - calculateWidthFromColumns
// - updateSizeFromGridColumns
// - adjustGridColumnsFromSize
// - calculateColumnsFromWidth