package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
	//"time"
)

// {firstname}_{firstname backwards}_{randomly generated integer between 1 and 1,000,000,000}

func main() {
	if len(os.Args) != 4 {
		fmt.Println("Usage: ./perfection-crack susan 1 1000000000")
		os.Exit(0)
	}
	//fmt.Println(os.Args[1], os.Args[2], os.Args[3])
	name := os.Args[1]
	minNum := os.Args[2]
	maxNum := os.Args[3]

	minNumInt, _ := strconv.Atoi(minNum)
	maxNumInt, _ := strconv.Atoi(maxNum)

	writer(name, minNumInt, maxNumInt)

}

func reverseString(str string) (revStr string) {
	strByte := []rune(str)
	for i := len(strByte) - 1; i >= 0; i-- {
		revStr += string(strByte[i])
	}
	return revStr
}

func writer(name string, low int, high int) {
	file, err := os.OpenFile("./passwords.txt", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0640)
	if err != nil {
		log.Fatalf("Error occurred: %v\n", err)
	}
	defer file.Close()

	reverseName := reverseString(name)
	nameToWrite := fmt.Sprintf("%v_%v_", name, reverseName)
	//fmt.Println(name, reverseName, nameToWrite)

	for i := low; i <= high; i++ {
		fmt.Printf("Writing \"%v%v\" to passwords.txt...\n", nameToWrite, i)
		file.WriteString(nameToWrite + fmt.Sprintln(i))
		//time.Sleep(time.Millisecond * 50)
	}
}