package dungeon

import (
	"embed"
	"image"
)

const (
	tileSize = 16
)

//go:embed tilesets/*
var tileSetFS embed.FS

type TileSet struct {
	Name  string
	Image *image.NRGBA
}

func LoadTileSet(name string) (*TileSet, error) {

	out := &TileSet{Name: name}

	tileSetFile, err := tileSetFS.Open("tilesets/" + name + ".png")
	if err != nil {
		return nil, err
	}
	defer tileSetFile.Close()

	tileSetSheet, _, err := image.Decode(tileSetFile)
	if err != nil {
		return nil, err
	}
	out.Image = tileSetSheet.(*image.NRGBA)

	return out, nil
}

func (t *TileSet) TileBounds(tileType TileType) image.Rectangle {
	index := int(tileType) - 1
	return image.Rect(
		index*tileSize,
		0,
		(index*tileSize)+tileSize,
		tileSize,
	)
}