import { GRID_GAP } from '../constants.js';
import { getColor } from '../utils/color.js';

/**
 * Block - 方块实体
 * 带有数字标记，被小球碰撞时数字减少，归零时消除
 */
export class Block {
  /**
   * @param {number} gridX - 网格列位置 (0-6)
   * @param {number} gridY - 网格行位置 (0-N)
   * @param {number} count - 方块数字（剩余生命值）
   * @param {number} size - 方块边长（像素）
   */
  constructor(gridX, gridY, count, size) {
    this.gridX = gridX;
    this.gridY = gridY;
    this.count = count;
    this.size = size;
    this.destroyed = false;
  }

  /**
   * 被小球击中，count 减 1
   * count <= 0 时标记为已消除
   * @returns {boolean} 是否被消除
   */
  hit() {
    this.count -= 1;
    this._hitTime = performance.now();
    if (this.count <= 0) {
      this.destroyed = true;
    }
    return this.destroyed;
  }

  /**
   * 将网格坐标转为像素坐标的碰撞矩形
   * @returns {{ x: number, y: number, width: number, height: number }}
   */
  getRect() {
    return {
      x: this.gridX * (this.size + GRID_GAP) + GRID_GAP,
      y: this.gridY * (this.size + GRID_GAP) + GRID_GAP,
      width: this.size,
      height: this.size
    };
  }

  /**
   * 根据 count 计算当前颜色
   * @returns {string} 十六进制颜色字符串
   */
  getColor() {
    return getColor(this.count);
  }

  /**
   * 判断方块是否已被消除
   * @returns {boolean}
   */
  isDestroyed() {
    return this.count <= 0;
  }

  /**
   * 回合结束时方块向下移动一行
   */
  moveDown() {
    this.gridY += 1;
  }
}