package cli

import (
	"fmt"
	"strconv"
)

const (
	multiTypeName = "num"
)

type cliOptionMulti struct {
	cliOptionBase
	defaultValue int
	targetVar    *int
}

func (opt *cliOptionMulti) init() {
	if opt.targetVar != nil {
		*opt.targetVar = opt.defaultValue
	}
}

func (opt *cliOptionMulti) getTargetVar() (any, string) {
	var value int
	if opt.targetVar != nil {
		value = *opt.targetVar
	}
	return value, multiTypeName
}

func (opt *cliOptionMulti) requiresValue() bool {
	return false
}

func (opt *cliOptionMulti) getDefaultValue() string {
	return strconv.Itoa(opt.defaultValue)
}

func (opt *cliOptionMulti) getTemplate() (templ string) {
	if opt.shortAlias != "" {
		templ = fmt.Sprintf(`-%s, --%s`, opt.shortAlias, opt.name)
	} else {
		templ = fmt.Sprintf(`--%s`, opt.name)
	}
	return
}

func (opt *cliOptionMulti) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
	if opt.targetVar != nil {
		*opt.targetVar++
	}
	return
}

func (cli *CliParser) AddMultiOpt(name, short string, targetVar *int, defaultValue int, description string, aliases ...string) OptReference {
	if cli.optionExists(name, short, aliases) {
		panic(errOptionAlreadyDefined(name))
	}
	opt := &cliOptionMulti{
		cliOptionBase: cliOptionBase{
			name:        name,
			shortAlias:  short,
			aliases:     aliases,
			description: description,
		},
		targetVar:    targetVar,
		defaultValue: defaultValue,
	}
	cli.options = append(cli.options, opt)
	return opt
}