import { GAME_HEIGHT, GAME_WIDTH, TILE_SIZE } from "../constants.js";
import { GameObject } from "./game-object.js";

export class Sprite extends GameObject {
  constructor({ image, x = 0, y = 0, width = 0, height = 0 }) {
    super({ x, y, height, width });
    this.image = image;
    this.imageWidth = this.image.width;
    this.imageHeight = this.image.height;
  }

  render(ctx, sourceX, sourceY) {
    ctx.drawImage(
      this.image,
      this.x,
      this.y,
      this.width,
      this.height,
      sourceX,
      sourceY,
      this.width,
      this.height
    );
  }
}

export class SpriteSheet extends GameObject {
  constructor({
    imageId,
    x = 0,
    y = 0,
    tileWidth = 16,
    tileHeight = 16,
    offsetX = 0,
    offsetY = 0,
  }) {
    super({ x, y });
    this.image = document.getElementById(imageId);
    this.imageWidth = this.image.width;
    this.imageHeight = this.image.height;
    this.tileWidth = tileWidth;
    this.tileHeight = tileHeight;
    this.offsetX = offsetX;
    this.offsetY = offsetY;
    this.sprites = this._getSprites();
  }

  _getSprites() {
    const sprites = [];
    for (let row = 0; row < this.imageHeight; row += this.tileHeight) {
      for (let col = 0; col < this.imageWidth; col += this.tileHeight) {
        sprites.push(
          new Sprite({
            image: this.image,
            x: col + this.offsetX,
            y: row + this.offsetY,
            width: this.tileWidth,
            height: this.tileHeight,
          })
        );
      }
    }
    return sprites;
  }
}

export class Player extends GameObject {
  constructor({ gameObjects = [], x = 0, y = 0, speed = 1, ...args }) {
    super({ x, y, gameObjects, ...args });
    this.speed = speed;
    this.keys = [
      { key: "ArrowUp", pressed: false, value: [0, -1] },
      { key: "ArrowDown", pressed: false, value: [0, 1] },
      { key: "ArrowLeft", pressed: false, value: [-1, 0] },
      { key: "ArrowRight", pressed: false, value: [1, 0] },
    ];
    this.availableKeys = this.keys.reduce(
      (acc, item) => ({ ...acc, [item.key]: item }),
      {}
    );
    this.eventEmitter.on("levelChanged", (...args) => {
      this.x = x;
      this.y = y;
    });
  }

  update(delta) {
    this.keys.forEach((item) => {
      if (item.pressed) {
        this.moveCharacter(...item.value, delta);
      }
    });
  }

  onKeyPressed(key) {
    if (!this.availableKeys[key]) return;
    this.availableKeys[key].pressed = true;
  }

  onKeyReleased(key) {
    if (!this.availableKeys[key]) return;
    this.availableKeys[key].pressed = false;
  }

  render(ctx, ...args) {
    const [x, y] = args;
    const [spriteSheet] = this.gameObjects;
    const [item] = spriteSheet.sprites;
    item.render(ctx, this.x - x, this.y - y);
  }

  moveCharacter(dx, dy, delta) {
    const speed = Math.floor(delta * this.speed * 100);
    this.x = this.x + dx * speed;
    this.y = this.y + dy * speed;
    // TODO: Check for collisions and stop movement if needed
  }
}