package cli

import (
	"fmt"
	"os"
	"strings"
)

// const (
// 	VER_PROGRAM = iota
// 	VER_VERSION
// 	VER_DATE
// 	VER_EMAIL
// )

// GetVersionSection()
func (cli *CliParser) GetVersionSection(sectionName string) (secValue string, err error) {
	var sectionId int
	if sectionName == "" || sectionName == "all" || sectionName == "full" {
		secValue = cli.version[5 : len(cli.version)-2]
	} else {
		sections := strings.Split(cli.version[5:len(cli.version)-2], ",")
		switch sectionName {
		case "program":
			sectionId = 0
		case "version", "number":
			sectionId = 1
		case "date":
			sectionId = 2
		case "email":
			sectionId = 3
		case "full":
			sectionId = -1
		default:
			sectionId = 1
		}
		if sectionId >= 0 && sectionId < len(sections) {
			secValue = sections[sectionId]
		} else {
			err = fmt.Errorf("unknown version section %q", sectionName)
		}
	}
	return
}

// PrintVersion()
func (cli *CliParser) PrintVersion(specs []string) {
	if len(specs) == 0 {
		if specValue, err := cli.GetVersionSection("number"); err == nil {
			os.Stdout.WriteString(specValue + "\n")
		}
	} else {
		for _, spec := range specs {
			if specValue, err := cli.GetVersionSection(spec); err == nil {
				os.Stdout.WriteString(specValue + "\n")
			}
		}
	}
}