package driver

import (
    "bytes"
    "fmt"
    "io"
)

// labels is a map of key value pairs to be included as metadata in a configmap object.
type labels map[string]string

func (lbs *labels) init()                { *lbs = labels(make(map[string]string)) }
func (lbs labels) get(key string) string { return lbs[key] }
func (lbs labels) set(key, val string)   { lbs[key] = val }

func (lbs labels) keys() (ls []string) {
    for key := range lbs {
        ls = append(ls, key)
    }
    return
}

func (lbs labels) match(set labels) bool {
    for _, key := range set.keys() {
        if lbs.get(key) != set.get(key) {
            return false
        }
    }
    return true
}

func (lbs labels) toMap() map[string]string { return lbs }

func (lbs *labels) fromMap(kvs map[string]string) {
    for k, v := range kvs {
        lbs.set(k, v)
    }
}

func (lbs labels) dump(w io.Writer) error {
    var b bytes.Buffer

    fmt.Fprintln(&b, "labels:")
    for k, v := range lbs {
        fmt.Fprintf(&b, "\t- %q -> %q\n", k, v)
    }

    _, err := w.Write(b.Bytes())
    return err
}