package pwd

import (
	"fmt"
	"math/rand"
)

const (
	NumStr  = "0123456789"
	CharStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
	SpecStr = "+=-@#~,.[]()!%^*$"
)

type Mode int

const (
	MixMode  Mode = 0
	NumMode  Mode = 1
	CharMode Mode = 2
)

const (
	DefaultMode   = MixMode
	DefaultLength = 16
)

func DefaultGenerate() string {
	return Generate(DefaultMode, DefaultLength)
}

func Generate(m Mode, length int) string {
	if length < 1 {
		length = DefaultLength
	}

	var passwd = make([]byte, length)
	var sourceStr string

	if m == NumMode {
		sourceStr = NumStr
	} else if m == CharMode {
		sourceStr = CharStr
	} else {
		sourceStr = fmt.Sprintf("%s%s%s", NumStr, CharStr, SpecStr)
	}

	for i := 0; i < length; i++ {
		index := rand.Intn(len(sourceStr))
		passwd[i] = sourceStr[index]
	}
	return string(passwd)
}

func ConvertName(list []string) string {
	var str = ""
	for _, s := range list {
		str += s
	}

	return str
}