package cmdlets

import (
	"fmt"
	"strings"
)

type Usage struct {
	Name     string
	Short    string
	Long     []string
	Flags    map[string]string
	Examples []string
}

func (u Usage) String() string {
	str := strings.Builder{}
	str.WriteString(
		fmt.Sprintf("%s SUBCOMMAND\n\n", strings.ToUpper(u.Name)),
	)
	str.WriteString(fmt.Sprintf("\t%s\t%s\n\n", u.Name, u.Short))
	for _, line := range u.Long {
		str.WriteString(fmt.Sprintf("\t%s\n", line))
	}
	str.WriteRune('\n')
	if len(u.Flags) != 0 {
		for flag, desc := range u.Flags {
			str.WriteString(fmt.Sprintf("\t%s\n\t\t%s\n", flag, desc))
		}
		str.WriteRune('\n')
	}
	if len(u.Examples) != 0 {
		str.WriteString("EXAMPLES\n\n")
		for _, example := range u.Examples {
			str.WriteString(fmt.Sprintf("\t%s\n", example))
		}
		str.WriteRune('\n')
	}

	return str.String()
}

type Commandlet interface {
	Name() string
	Usage() Usage
	Invoke(args ...string) error
}