// Flyweight: 공유되는 내재적 상태를 포함
class TreeType {
  private name: string;
  private color: string;
  private texture: string;

  constructor(name: string, color: string, texture: string) {
    this.name = name;
    this.color = color;
    this.texture = texture;
  }

  draw(canvas: Canvas, x: number, y: number): void {
    // 1. 주어진 타입, 색상, 텍스처의 비트맵 생성
    // 2. 캔버스의 X, Y 좌표에 비트맵 그리기
    console.log(`Drawing ${this.name} tree at (${x}, ${y})`);
  }
}

// Flyweight Factory: flyweight 풀 관리
class TreeFactory {
  private static treeTypes: Map<string, TreeType> = new Map();

  static getTreeType(name: string, color: string, texture: string): TreeType {
    const key = `${name}_${color}_${texture}`;

    if (!this.treeTypes.has(key)) {
      this.treeTypes.set(key, new TreeType(name, color, texture));
      console.log(`Created new TreeType: ${name}`);
    }

    return this.treeTypes.get(key)!;
  }
}

// Context: 외재적 상태와 flyweight 참조를 포함
class Tree {
  private x: number;
  private y: number;
  private type: TreeType;

  constructor(x: number, y: number, type: TreeType) {
    this.x = x;
    this.y = y;
    this.type = type;
  }

  draw(canvas: Canvas): void {
    this.type.draw(canvas, this.x, this.y);
  }
}

// Client: 숲 전체 관리
class Forest {
  private trees: Tree[] = [];

  plantTree(x: number, y: number, name: string, color: string, texture: string): void {
    const type = TreeFactory.getTreeType(name, color, texture);
    const tree = new Tree(x, y, type);
    this.trees.push(tree);
  }

  draw(canvas: Canvas): void {
    for (const tree of this.trees) {
      tree.draw(canvas);
    }
  }
}

// 사용 예시
const forest = new Forest();

// 백만 그루의 나무를 심어도 TreeType은 몇 개만 생성됨
for (let i = 0; i < 1000000; i++) {
  const x = Math.random() * 1000;
  const y = Math.random() * 1000;

  // 무작위로 나무 타입 선택
  const types = [
    ["Oak", "green", "oak_texture"],
    ["Pine", "dark_green", "pine_texture"],
    ["Birch", "white", "birch_texture"]
  ];
  const [name, color, texture] = types[Math.floor(Math.random() * 3)];

  forest.plantTree(x, y, name, color, texture);
}