package pwgenerator

import (
	"strings"
)

// Generate generates a list of passwords for a GenOpts.
func (o *GenOpts) Generate() (passwords []string, err error) {

	// TODO

	return
}

// Chars returns the list of evaluated characters that would be used in a GenOpts.
func (o *GenOpts) Chars() (chars CharSet) {

	chars = make(CharSet, 0)

	if o.explicitCharset != nil && len(o.explicitCharset) != 0 {
		chars = o.explicitCharset
		return
	}

	if o.Alpha {
		chars = append(chars, alpha...)
	}
	if o.Numeric {
		chars = append(chars, numeric...)
	}
	if o.Symbols {
		chars = append(chars, symbols...)
	}
	if o.ExtendedSymbols {
		chars = append(chars, extendedSymbols...)
	}

	return
}

/*
	SetExplicitCharset sets a GenOpts' charset to an explicit selection. It is deduplicated before being used unless inclDupes is true.
	(Duplicate runes can be used to increase the likelihood of specific characters.)

	Note that if an explicit charset is defined, the following opts will have NO effect:

			Alpha
			Numeric
			Symbols
			ExtendedSymbols
			CountUpper
			CountLower
			CountSymbols
			CountExtended
			DisabledChars

	To have these fields be used again, call GenOpts.UnsetExplicitCharset.

	chars can be a CharSet, []rune, []byte, []string, or string
*/
func (o *GenOpts) SetExplicitCharset(chars interface{}, inclDupes bool) (err error) {

	var charset CharSet

	switch t := chars.(type) {
	case []rune:
		charset = CharSet(string(t))
	case []byte:
		charset = CharSet(string(t))
	case []string:
		s := strings.Join(t, "")
		charset = CharSet(s)
	case string:
		charset = CharSet(t)
	default:
		err = ErrBadType
		return
	}

	if !inclDupes {
		sortDedupe(&charset)
	}

	o.explicitCharset = charset

	return
}

/*
	UnsetExplicitCharset removes the explicit charset used for generation and instead uses the fields specified in the actual GenOpts.

	See GenOpts.SetExplicitCharset for more details.
*/
func (o *GenOpts) UnsetExplicitCharset() {

	o.explicitCharset = nil

	return
}