package feed

//go:generate stringer -linecomment -type=V2Impact

import (
  "encoding/json"
  "fmt"
)

// CVSS v2 impact level.
type V2Impact byte

const (
  V2ImpactNone V2Impact = iota // NONE
  V2ImpactPartial // PARTIAL
  V2ImpactComplete // COMPLETE
)

// Unmarshal CVSS v2 impact level from JSON.
func (me *V2Impact) 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 = V2ImpactNone
  case "PARTIAL":
    *me = V2ImpactPartial
  case "COMPLETE":
    *me = V2ImpactComplete
  default:
    // return error
    return fmt.Errorf("unknown CVSS v2 impact: %s", s)
  }

  // return success
  return nil
}