package cvss

import (
  "strings"
)

// CVSS v3.0 prefix
var v30Prefix = "CVSS:3.0/"

// CVSS 3.0 vector.
type v30Vector []v3Metric

// Convert vector to string
func (v v30Vector) String() string {
  // convert to slice of metrics
  metrics := []v3Metric(v)

  // build vector
  r := make([]string, len(metrics))
  for i, m := range(metrics) {
    r[i] = m.String()
  }

  // build and return string
  return v30Prefix + strings.Join(r, "/")
}

// Return CVSS version.
func (v30Vector) Version() Version {
  return V30
}

// Return metrics in this vector.
func (v v30Vector) Metrics() []Metric {
  // build result
  r := make([]Metric, len(v))
  for i, m := range(v) {
    r[i] = m
  }

  // return result
  return r
}

// Create CVSS 3.0 vector from string.
func newV30Vector(s string) (Vector, error) {
  // strip version prefix, split into metric strings
  strs := strings.Split(s[len(v31Prefix):], "/")
  r := make([]v3Metric, len(strs))

  // build results
  for i, ms := range(strs) {
    // get metric from string
    m, err := getV3Metric(V30, ms)
    if err != nil {
      return nil, err
    }

    r[i] = m
  }

  // return result
  return v30Vector(r), nil
}

// Is the given string a CVSSv3.0 vector string?
func isV30VectorString(s string) bool {
  return (len(s) > len(v30Prefix)) && (s[:len(v30Prefix)] == v30Prefix);
}