package audio

import (
	"testing"
	"time"
)

// Playing a stopped take must not consume it.
//
// Reported on the air: the recording plays once, then nothing — "as if it threw
// the sound away after playing it". PeekQSO is what the playback reads, and it
// is meant to COPY; TakeQSO is the one that clears.
func TestPeekDoesNotConsumeTheTake(t *testing.T) {
	r := &Recorder{running: true, active: true, paused: true, prerollSamples: sampleRate}
	r.acc = make([]int16, 4000)
	for i := range r.acc {
		r.acc[i] = int16(i % 500)
	}

	first, err := r.PeekQSO()
	if err != nil {
		t.Fatalf("first peek: %v", err)
	}
	second, err := r.PeekQSO()
	if err != nil {
		t.Fatalf("second peek: %v — the take was consumed by the first", err)
	}
	if len(first) != len(second) {
		t.Errorf("second peek returned %d bytes, first %d", len(second), len(first))
	}

	// And the copy must be independent: the caller holds these bytes while the
	// recorder may still be appending to its own slice.
	if len(first) > 0 {
		first[0] = ^first[0]
		again, _ := r.PeekQSO()
		if len(again) > 0 && again[0] == first[0] {
			t.Error("PeekQSO handed out its internal buffer, not a copy")
		}
	}

	// Resuming and stopping again keeps everything captured so far.
	r.ResumeQSO()
	r.mu.Lock()
	r.acc = append(r.acc, make([]int16, 1000)...)
	r.mu.Unlock()
	r.PauseQSO()
	third, err := r.PeekQSO()
	if err != nil {
		t.Fatalf("peek after resume: %v", err)
	}
	if len(third) <= len(second) {
		t.Errorf("after resuming, the take is %d bytes — it should have grown past %d", len(third), len(second))
	}
	_ = time.Now
}