package transcode

import (
    "os"
    "path/filepath"
    "runtime"
    "testing"
)

func TestSniffOggCodec_opus(t *testing.T) {
    path := pionTinyOggPath(t)
    if got := sniffOggCodec(path); got != "opus" {
        t.Fatalf("sniffOggCodec() = %q want opus", got)
    }
}

func TestDecodeOggOpus_pionTiny(t *testing.T) {
    path := pionTinyOggPath(t)
    streamer, format, closer, err := decodeOggOpus(path)
    if err != nil {
        t.Fatal(err)
    }
    defer closer.Close()
    if format.SampleRate == 0 {
        t.Fatal("zero sample rate")
    }
    buf := make([][2]float64, 4096)
    n, ok := streamer.Stream(buf)
    if !ok || n == 0 {
        t.Fatal("expected pcm samples")
    }
}

func pionTinyOggPath(t *testing.T) string {
    t.Helper()
    _, file, _, ok := runtime.Caller(0)
    if !ok {
        t.Fatal("runtime.Caller failed")
    }
    modRoot := filepath.Clean(filepath.Join(filepath.Dir(file), ".."))
    cache := os.Getenv("GOMODCACHE")
    if cache == "" {
        home, _ := os.UserHomeDir()
        cache = filepath.Join(home, "go", "pkg", "mod")
    }
    path := filepath.Join(cache, "github.com/pion/opus@v0.0.0-20260601214817-71d58474cec8/testdata/tiny.ogg")
    if _, err := os.Stat(path); err != nil {
        _ = modRoot
        t.Skipf("pion testdata not in module cache: %v", err)
    }
    return path
}