package feed

//go:generate stringer -linecomment -type=V3Impact

import (
  "encoding/json"
  "fmt"
)

// CVSS v3 impact level.
type V3Impact byte

const (
  V3ImpactNone V3Impact = iota // NONE
  V3ImpactLow // LOW
  V3ImpactHigh // HIGH
)

// Unmarshal CVSS v3 impact level from JSON.
func (me *V3Impact) UnmarshalJSON(b []byte) error {
  // decode string, check for error
  var s string
  if err := json.Unmarshal(b, &s); err != nil {
    return err
  }

  // check value
  switch s {
  case "NONE":
    *me = V3ImpactNone
  case "LOW":
    *me = V3ImpactLow
  case "HIGH":
    *me = V3ImpactHigh
  default:
    // return error
    return fmt.Errorf("unknown CVSS v3 impact: %s", s)
  }

  // return success
  return nil
}