package hero

import (
	"image"
	"image/color"
	_ "image/gif"
	"os"

	"github.com/hajimehoshi/ebiten/v2"
)

var (
	spriteBack1  *ebiten.Image
	spriteBack2  *ebiten.Image
	spriteFront1 *ebiten.Image
	spriteFront2 *ebiten.Image
	spriteLeft1  *ebiten.Image
	spriteLeft2  *ebiten.Image
	spriteRight1 *ebiten.Image
	spriteRight2 *ebiten.Image
)

func init() {
	spriteBack1 = loadSprite("assets/hero/avt1_bk1.gif")
	spriteBack2 = loadSprite("assets/hero/avt1_bk2.gif")
	spriteFront1 = loadSprite("assets/hero/avt1_fr1.gif")
	spriteFront2 = loadSprite("assets/hero/avt1_fr2.gif")
	spriteLeft1 = loadSprite("assets/hero/avt1_lf1.gif")
	spriteLeft2 = loadSprite("assets/hero/avt1_lf2.gif")
	spriteRight1 = loadSprite("assets/hero/avt1_rt1.gif")
	spriteRight2 = loadSprite("assets/hero/avt1_rt2.gif")
}

func loadSprite(path string) *ebiten.Image {
	file, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	defer file.Close()

	img, _, err := image.Decode(file)
	if err != nil {
		panic(err)
	}

	bounds := img.Bounds()
	rgba := image.NewRGBA(bounds)
	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
		for x := bounds.Min.X; x < bounds.Max.X; x++ {
			r, g, b, a := img.At(x, y).RGBA()
			if r > 0xf000 && g > 0xf000 && b > 0xf000 {
				rgba.Set(x, y, color.RGBA{0, 0, 0, 0})
			} else {
				rgba.Set(x, y, color.RGBA{
					R: uint8(r >> 8),
					G: uint8(g >> 8),
					B: uint8(b >> 8),
					A: uint8(a >> 8),
				})
			}
		}
	}

	return ebiten.NewImageFromImage(rgba)
}