package feed

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

import (
  "encoding/json"
  "fmt"
)

type Severity byte

const (
  SeverityNone Severity = iota // NONE
  SeverityLow // LOW
  SeverityMedium // MEDIUM
  SeverityHigh // HIGH
  SeverityCritical // CRITICAL
)

// Unmarshal CVSS severity from JSON.
func (me *Severity) 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 = SeverityNone
  case "LOW":
    *me = SeverityLow
  case "MEDIUM":
    *me = SeverityMedium
  case "HIGH":
    *me = SeverityHigh
  case "CRITICAL":
    *me = SeverityCritical
  default:
    // return error
    return fmt.Errorf("unknown severity: %s", s)
  }

  // return success
  return nil
}

// Marshal CVSS severity as JSON.
func (me Severity) MarshalJSON() ([]byte, error) {
  return json.Marshal(me.String())
}