package cli

const (
	stringTypeName = "string"
)

type cliOptionString struct {
	cliOptionBase
	defaultValue string
	targetVar    *string
}

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

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

func (opt *cliOptionString) requiresValue() bool {
	return opt.targetVar != nil
}

func (opt *cliOptionString) getDefaultValue() string {
	return opt.defaultValue
}

func (opt *cliOptionString) getTemplate() string {
	return opt.makeOptTemplate(false, stringTypeName)
}

func (opt *cliOptionString) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
	var value string
	if value, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
		var boxedValue any
		if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
			if opt.targetVar != nil {
				if boxedValue != nil {
					if val, ok := boxedValue.(string); ok {
						*(opt.targetVar) = val
					} else {
						err = errInvalidOptionValue(opt.name, boxedValue, "string")
					}
				} else {
					*(opt.targetVar) = value
				}
			}
		}
	}
	return
}

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

//---------------------- cliOptionDir ----------------------

type cliOptionDir struct {
	cliOptionString
}

func (opt *cliOptionDir) getTemplate() string {
	return opt.cliOptionBase.makeOptTemplate(false, "dir")
}

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

//---------------------- cliOptionFile ----------------------

type cliOptionFile struct {
	cliOptionString
}

func (opt *cliOptionFile) getTemplate() string {
	return opt.cliOptionBase.makeOptTemplate(false, "file")
}

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