package uhf

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestChannelEventsUseMonotonicIDs(t *testing.T) {
	channelEventMu.Lock()
	previousQueue := ChannelEventQueue
	previousNextID := channelEventNextID
	ChannelEventQueue = make([]ChannelEvent, 0, 50)
	channelEventNextID = 0
	channelEventMu.Unlock()
	t.Cleanup(func() {
		channelEventMu.Lock()
		ChannelEventQueue = previousQueue
		channelEventNextID = previousNextID
		channelEventMu.Unlock()
	})

	PushChannelEvent(ChannelEvent{RFIDTag: "A", Timestamp: 100})
	PushChannelEvent(ChannelEvent{RFIDTag: "B", Timestamp: 100})

	all := GetChannelEvents(0)
	require.Len(t, all, 2)
	require.Equal(t, uint64(1), all[0].ID)
	require.Equal(t, uint64(2), all[1].ID)

	afterFirst := GetChannelEvents(all[0].ID)
	require.Len(t, afterFirst, 1)
	require.Equal(t, "B", afterFirst[0].RFIDTag)
}