package app

import (
	"testing"

	"github.com/hjbdev/patterm/internal/protocol"
)

func TestClientSubscriberCopiesChunksAndMarksSnapshotOnOverflow(t *testing.T) {
	sub := newClientSubscriber(&Project{Key: "project"}, "client", 1)
	chunk := []byte("first")
	sub.OnPTYOut("p_123456", chunk)
	chunk[0] = 'X'

	f, ok := sub.Recv()
	if !ok {
		t.Fatalf("Recv closed")
	}
	payload, err := protocol.Decode[protocol.PaneChunk](f)
	if err != nil {
		t.Fatalf("Decode: %v", err)
	}
	if string(payload.Bytes) != "first" {
		t.Fatalf("payload retained pump buffer: %q", string(payload.Bytes))
	}

	sub.OnPTYOut("p_123456", []byte("queued"))
	sub.OnPTYOut("p_123456", []byte("dropped"))
	if !sub.SnapshotRequired("p_123456") {
		t.Fatalf("overflow did not mark pane snapshot required")
	}
}