import { doRectanglesOverlap } from "./util.js"
export default class Room {
  constructor(json, name) {
    this.json = json
    this.name = name
  }

  tick(game, dt) {
    this.json.layers.forEach(layer => {
      if (layer.type == "objectgroup") this.tickObjectGroup(game, layer)
    })
  }

  tickObjectGroup(game, layer) {
    const { player } = game
    layer.objects.forEach(object => {
      if (doRectanglesOverlap(player, object)) {
	const eventName = object.properties.find(property => property.name == "event")?.value
	if (eventName) game.triggerEvent(eventName, object)
      }
      if (player.interactHitbox && doRectanglesOverlap(player.interactHitbox, object)) {
	const eventName = object.properties.find(property => property.name == "interactEvent")?.value
	if (eventName) game.triggerEvent(eventName, object)
      }
    })
  }

  get tilesetsToLoad() {
    const ts = {}
    this.json.tilesets.forEach((tileset, index) => {
      ts[`${this.name}-${index}`] = tileset.source
    })
    return ts
  }

  populateTilesets(assets) {
    console.log(this.json)
    this.tilesets = this.json.tilesets.map((tileset, index) => {
      const ts = assets.get(`${this.name}-${index}`)
      ts.populateImage(assets)
      return ts
    })
  }

  draw(ctx) {
    this.json.layers.forEach(this.drawLayer.bind(this, ctx))
  }

  drawLayer(ctx, layer) {
    if (layer.type == "tilelayer") this.drawTileLayer(ctx, layer)
    else if (layer.type == "objectgroup") this.drawObjectGroup(ctx, layer)
  }

  drawTileLayer(ctx, layer) {
    for (let y = 0; y < layer.height; y++) {
      for (let x = 0; x < layer.width; x++) {
	const index = x + (y * layer.width)
	const tileIndex = layer.data[index] - 1
	const tileset = this.tilesets[0]
	const [sx, sy] = tileset.tileOffset(tileIndex)
	ctx.drawImage(
	  tileset.image,
	  sx,
	  sy,
	  tileset.tileWidth,
	  tileset.tileHeight,
	  x * this.json.tilewidth,
	  y * this.json.tileheight,
	  this.json.tilewidth,
	  this.json.tileheight
	)
      }
    }
  }

  drawObjectGroup(ctx, layer) {
    layer.objects.forEach(object => {
      ctx.fillStyle = object.properties.find(property => property.name == "color").value
      ctx.fillRect(object.x, object.y, object.width, object.height)
    })
  }
}