package diagram

import (
	"testing"

	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestLatestMeasurementValueUsesMemberTimestamp(t *testing.T) {
	value, err := latestMeasurementValue([]redis.Z{
		{Member: "100", Score: 999},
		{Member: "300", Score: 12},
		{Member: "200", Score: 500},
	}, "measurement-key")

	require.NoError(t, err)
	assert.Equal(t, float64(12), value)
}

func TestLatestMeasurementValueRejectsMissingOrInvalidTimestamps(t *testing.T) {
	_, err := latestMeasurementValue(nil, "measurement-key")
	require.Error(t, err)

	_, err = latestMeasurementValue([]redis.Z{{Member: "invalid", Score: 1}}, "measurement-key")
	require.Error(t, err)
}