package imageprocessor

import (
	"testing"

	"github.com/davidbyttow/govips/v2/vips"
)

// TestCheckJPEGXLSupport fails when libvips lacks JPEG XL support, as on
// Alpine without the vips-jxl package.
func TestCheckJPEGXLSupport(t *testing.T) {
	t.Parallel()

	err := CheckJPEGXLSupport()
	if err != nil {
		t.Fatalf("CheckJPEGXLSupport() error = %v", err)
	}
}

// TestLibvipsSavesAndLoadsJPEGXL saves an image as JPEG XL with govips and
// loads it back. It fails when libvips lacks JPEG XL support, as on Alpine
// without the vips-jxl package.
func TestLibvipsSavesAndLoadsJPEGXL(t *testing.T) {
	t.Parallel()

	img, err := vips.NewImageFromBuffer(createTestJPEG(t, 64, 48))
	if err != nil {
		t.Fatalf("failed to load test JPEG: %v", err)
	}

	defer img.Close()

	jxl, _, err := img.ExportJxl(vips.NewJxlExportParams())
	if err != nil {
		t.Fatalf("ExportJxl() error = %v", err)
	}

	loaded, err := vips.NewImageFromBuffer(jxl)
	if err != nil {
		t.Fatalf("failed to load the JPEG XL image: %v", err)
	}

	defer loaded.Close()

	if loaded.Format() != vips.ImageTypeJXL {
		t.Errorf("loaded format = %s, want jxl", vips.ImageTypes[loaded.Format()])
	}

	if loaded.Width() != 64 || loaded.Height() != 48 {
		t.Errorf("loaded size = %dx%d, want 64x48", loaded.Width(), loaded.Height())
	}
}