package release

import (
	"strings"
	"fmt"
	"bufio"
)

type writer struct {
	writer *bufio.Writer
}

func (r *writer) WriteValue(key, value string) (int, error) {
	if len(value) == 0 {
		return 0, nil
	}

	return r.writer.WriteString(key + ": " + value + "\n")
}

func (r *writer) WriteSlice(key string, s []string) (int, error) {
	if len(s) == 0 {
		return 0, nil
	}

	return r.writer.WriteString(key + ": " + strings.Join(s, " ") + "\n")
}

func (r *writer) WriteHashTable(key string, files []*File) {
	if files == nil || len(files) == 0 {
		return
	}

	r.writer.WriteString(key + ":\n")

	var hash string

	for _, f := range files {
		if hash = f.Hash(key); hash != "" {
			fmt.Fprintf(r.writer, " %s %d %s\n", hash, f.Size, f.Name)
		}
	}
}

func (r *writer) Flush() {
	r.writer.Flush()
}