package media

import (
	"image"
	"image/png"
	"os"
	"path/filepath"
	"testing"

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

func TestMain(m *testing.M) {
	vips.Startup(nil)
	code := m.Run()
	vips.Shutdown()
	os.Exit(code)
}

// testPNG writes a 100×60 PNG to a temp file and returns its path.
func testPNG(t *testing.T) string {
	t.Helper()
	img := image.NewRGBA(image.Rect(0, 0, 100, 60))
	path := filepath.Join(t.TempDir(), "src.png")
	f, err := os.Create(path)
	if err != nil {
		t.Fatalf("create test png: %v", err)
	}
	if err := png.Encode(f, img); err != nil {
		t.Fatalf("encode test png: %v", err)
	}
	f.Close()
	return path
}

func TestConvertToWebP(t *testing.T) {
	out, err := ConvertAndResize(testPNG(t), 0, "webp")
	if err != nil {
		t.Fatalf("ConvertAndResize: %v", err)
	}
	if len(out) == 0 {
		t.Fatal("expected non-empty output")
	}
}

func TestConvertToJPEG(t *testing.T) {
	out, err := ConvertAndResize(testPNG(t), 0, "jpeg")
	if err != nil {
		t.Fatalf("ConvertAndResize: %v", err)
	}
	if len(out) == 0 {
		t.Fatal("expected non-empty output")
	}
}

func TestResizeAndConvert(t *testing.T) {
	out, err := ConvertAndResize(testPNG(t), 50, "webp")
	if err != nil {
		t.Fatalf("ConvertAndResize resize: %v", err)
	}
	if len(out) == 0 {
		t.Fatal("expected non-empty output")
	}
}

func TestConvertUnsupportedFormat(t *testing.T) {
	_, err := ConvertAndResize(testPNG(t), 0, "avif")
	if err == nil {
		t.Fatal("expected error for unsupported format")
	}
}

func TestConvertMissingFile(t *testing.T) {
	_, err := ConvertAndResize("/nonexistent/file.png", 0, "webp")
	if err == nil {
		t.Fatal("expected error for missing file")
	}
}