package memberlist

import (
	"testing"
)

func TestTransmitLimited_Queue(t *testing.T) {
	q := &TransmitLimitedQueue{RetransmitMult: 1, NumNodes: func() int { return 1 }}
	q.QueueBroadcast(&memberlistBroadcast{"test", nil, nil})
	q.QueueBroadcast(&memberlistBroadcast{"foo", nil, nil})
	q.QueueBroadcast(&memberlistBroadcast{"bar", nil, nil})

	if len(q.bcQueue) != 3 {
		t.Fatalf("bad len")
	}
	if q.bcQueue[0].b.(*memberlistBroadcast).node != "test" {
		t.Fatalf("missing test")
	}
	if q.bcQueue[1].b.(*memberlistBroadcast).node != "foo" {
		t.Fatalf("missing foo")
	}
	if q.bcQueue[2].b.(*memberlistBroadcast).node != "bar" {
		t.Fatalf("missing bar")
	}

	// Should invalidate previous message
	q.QueueBroadcast(&memberlistBroadcast{"test", nil, nil})

	if len(q.bcQueue) != 3 {
		t.Fatalf("bad len")
	}
	if q.bcQueue[0].b.(*memberlistBroadcast).node != "foo" {
		t.Fatalf("missing foo")
	}
	if q.bcQueue[1].b.(*memberlistBroadcast).node != "bar" {
		t.Fatalf("missing bar")
	}
	if q.bcQueue[2].b.(*memberlistBroadcast).node != "test" {
		t.Fatalf("missing test")
	}
}

func TestTransmitLimited_GetBroadcasts(t *testing.T) {
	q := &TransmitLimitedQueue{RetransmitMult: 3, NumNodes: func() int { return 10 }}

	// 18 bytes per message
	q.QueueBroadcast(&memberlistBroadcast{"test", []byte("1. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"foo", []byte("2. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"bar", []byte("3. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"baz", []byte("4. this is a test."), nil})

	// 2 byte overhead per message, should get all 4 messages
	all := q.GetBroadcasts(2, 80)
	if len(all) != 4 {
		t.Fatalf("missing messages: %v", all)
	}

	// 3 byte overhead, should only get 3 messages back
	partial := q.GetBroadcasts(3, 80)
	if len(partial) != 3 {
		t.Fatalf("missing messages: %v", partial)
	}
}

func TestTransmitLimited_GetBroadcasts_Limit(t *testing.T) {
	q := &TransmitLimitedQueue{RetransmitMult: 1, NumNodes: func() int { return 10 }}

	// 18 bytes per message
	q.QueueBroadcast(&memberlistBroadcast{"test", []byte("1. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"foo", []byte("2. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"bar", []byte("3. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"baz", []byte("4. this is a test."), nil})

	// 3 byte overhead, should only get 3 messages back
	partial1 := q.GetBroadcasts(3, 80)
	if len(partial1) != 3 {
		t.Fatalf("missing messages: %v", partial1)
	}

	partial2 := q.GetBroadcasts(3, 80)
	if len(partial2) != 3 {
		t.Fatalf("missing messages: %v", partial2)
	}

	// Only two not expired
	partial3 := q.GetBroadcasts(3, 80)
	if len(partial3) != 2 {
		t.Fatalf("missing messages: %v", partial3)
	}

	// Should get nothing
	partial5 := q.GetBroadcasts(3, 80)
	if len(partial5) != 0 {
		t.Fatalf("missing messages: %v", partial5)
	}
}

func TestTransmitLimited_Prune(t *testing.T) {
	q := &TransmitLimitedQueue{RetransmitMult: 1, NumNodes: func() int { return 10 }}

	ch1 := make(chan struct{}, 1)
	ch2 := make(chan struct{}, 1)

	// 18 bytes per message
	q.QueueBroadcast(&memberlistBroadcast{"test", []byte("1. this is a test."), ch1})
	q.QueueBroadcast(&memberlistBroadcast{"foo", []byte("2. this is a test."), ch2})
	q.QueueBroadcast(&memberlistBroadcast{"bar", []byte("3. this is a test."), nil})
	q.QueueBroadcast(&memberlistBroadcast{"baz", []byte("4. this is a test."), nil})

	// Keep only 2
	q.Prune(2)

	if q.NumQueued() != 2 {
		t.Fatalf("bad len")
	}

	// Should notify the first two
	select {
	case <-ch1:
	default:
		t.Fatalf("expected invalidation")
	}
	select {
	case <-ch2:
	default:
		t.Fatalf("expected invalidation")
	}

	if q.bcQueue[0].b.(*memberlistBroadcast).node != "bar" {
		t.Fatalf("missing bar")
	}
	if q.bcQueue[1].b.(*memberlistBroadcast).node != "baz" {
		t.Fatalf("missing baz")
	}
}

func TestLimitedBroadcastSort(t *testing.T) {
	bc := limitedBroadcasts([]*limitedBroadcast{
		&limitedBroadcast{
			transmits: 0,
		},
		&limitedBroadcast{
			transmits: 10,
		},
		&limitedBroadcast{
			transmits: 3,
		},
		&limitedBroadcast{
			transmits: 4,
		},
		&limitedBroadcast{
			transmits: 7,
		},
	})
	bc.Sort()

	if bc[0].transmits != 10 {
		t.Fatalf("bad val %v", bc[0])
	}
	if bc[1].transmits != 7 {
		t.Fatalf("bad val %v", bc[7])
	}
	if bc[2].transmits != 4 {
		t.Fatalf("bad val %v", bc[2])
	}
	if bc[3].transmits != 3 {
		t.Fatalf("bad val %v", bc[3])
	}
	if bc[4].transmits != 0 {
		t.Fatalf("bad val %v", bc[4])
	}
}