package protocol

import (
	"testing"
	"time"

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

func TestNewIDPreservesTimestampAndAddsRandomness(t *testing.T) {
	now := time.UnixMilli(1234567890123)
	first, err := NewID(now)
	require.NoError(t, err)

	second, err := NewID(now)
	require.NoError(t, err)
	require.True(t, ValidID(first))
	require.NotEqual(t, first, second)
	require.Equal(t, first[:10], second[:10])

	var milliseconds int64

	for _, character := range first[:10] {
		for index, candidate := range idAlphabet {
			if candidate == character {
				milliseconds = milliseconds*32 + int64(index)
			}
		}
	}

	require.Equal(t, now.UnixMilli(), milliseconds)

	_, err = NewID(time.UnixMilli(-1))
	require.Error(t, err)

	_, err = NewID(time.UnixMilli(1 << 48))
	require.Error(t, err)
}

func TestIdentifiersRejectNoncanonicalText(t *testing.T) {
	require.True(t, ValidID(deviceID))

	for _, value := range []string{"", "8123456789ABCDEFGHJKMNPQRST", "0123456789abcdefghjkmnpqrst", "0123456789ABCDEFGHIKMNPQRST"} {
		require.False(t, ValidID(value), value)
	}

	for _, value := range []string{"relay", "a0.b1-c2"} {
		require.True(t, ValidIdentifier(value), value)
	}

	for _, value := range []string{"", "-relay", "relay.", "a..b", "a.-b", "a_b", "A", "+", "#"} {
		require.False(t, ValidIdentifier(value), value)
	}
}