package metrics

import (
	"fmt"
	"math"
	"strconv"
	"time"
)

func ConvertToFloat64(v interface{}) (float64, error) {
	switch i := v.(type) {
	case float64:
		return float64(i), nil
	case float32:
		return float64(i), nil
	case int64:
		return float64(i), nil
	case int32:
		return float64(i), nil
	case int16:
		return float64(i), nil
	case int8:
		return float64(i), nil
	case uint64:
		return float64(i), nil
	case uint32:
		return float64(i), nil
	case uint16:
		return float64(i), nil
	case uint8:
		return float64(i), nil
	case int:
		return float64(i), nil
	case uint:
		return float64(i), nil
	case string:
		f, err := strconv.ParseFloat(i, 64)
		if err != nil {
			return math.NaN(), err
		}
		return f, err
	default:
		return math.NaN(), fmt.Errorf("Cannot convert %s to float64", i)
	}
}

// Returns milliseconds since epoch
func UnixMilli(t time.Time) int64 {
	return t.UnixNano() / 1e6
}