package platform

import (
	"bytes"
	"image"
	"image/color"
	"image/gif"
	"image/jpeg"
	"image/png"
	"testing"
)

func TestAssetDecodersUseActualContent(t *testing.T) {
	im := image.NewRGBA(image.Rect(0, 0, 3, 2))
	im.Set(1, 1, color.RGBA{R: 255, A: 255})
	for _, format := range []string{"png", "jpeg", "gif"} {
		var encoded bytes.Buffer
		var err error
		switch format {
		case "png":
			err = png.Encode(&encoded, im)
		case "jpeg":
			err = jpeg.Encode(&encoded, im, nil)
		case "gif":
			err = gif.Encode(&encoded, im, nil)
		}
		if err != nil {
			t.Fatal(err)
		}
		mime, width, height, err := inspectAsset(encoded.Bytes())
		if err != nil || mime != "image/"+format || width != 3 || height != 2 {
			t.Fatalf("%s decoded %s %dx%d: %v", format, mime, width, height, err)
		}
		if _, _, _, err := inspectAsset(encoded.Bytes()[:len(encoded.Bytes())/2]); err == nil {
			t.Errorf("truncated %s accepted", format)
		}
	}
	if _, _, _, err := inspectAsset([]byte("<svg xmlns='http://www.w3.org/2000/svg'></svg>")); err == nil {
		t.Fatal("SVG accepted")
	}
}