package feed

import (
  "encoding/json"
  "fmt"
  "math"
  "strconv"
)

// CVSS score
type Score float32

// Unmarshal CVSS score from JSON.
func (me *Score) UnmarshalJSON(b []byte) error {
  // decode float, check for error
  var v float32
  if err := json.Unmarshal(b, &v); err != nil {
    return err
  }

  // check score
  if v < 0.0 || v > 10.0 {
    return fmt.Errorf("CVSS score out of bounds: %2.1f", v)
  }

  // save result, return success
  *me = Score(v)
  return nil
}

func (me Score) String() string {
  val := math.Trunc(10.0 * float64(me)) / 10.0
  return strconv.FormatFloat(val, 'f', 1, 64)
}