/* Benutzer: Ineluki / Datum: 19.12.2009 / Zeit: 14:36 */
using System;
using System.IO;
using System.Collections.Generic;

namespace login_check
{
    class Program
    {
        public struct loginstruct {
            public string un;
            public string pw;
            public string pwsi;
            private string _pwsi2;
            public string pwsi2{
                get{
                    return this._pwsi2;
                }
                set{
                    if (value != pwsi) {
                        throw new Exception ("Password does not match with Retyped Password.");
                    }
                    this._pwsi2 = value;
                }

            }
            public string _email;
            public string email{
                get{
                    return this._email;
                }
                set{
                    bool form=value.Contains("@") &&(value.Contains(".de") ||value.Contains(".com"));
                    if (!form){
                        throw new Exception ("Your Email adress is incorrect.");
                        }
                    this._email=value;
                }
            }
        }

        public static string decrypt(string a){
            char[] b=a.ToCharArray();
            for (int x=0;x<b.Length;++x){
                b[x]+=(char)2;
            }
            return new string(b);
        }

        public static void LoginOrSignup (){
            bool ls=false;
            bool fehler=false;
            do{
                Console.Write("{0}\n","Please choose:\t(0) Login, (1) Sign up");
                int e=Convert.ToInt32(Console.ReadLine());
                if (e==0){
                    ls=true;
                    fehler=true;
                }
                if (e==1){
                    ls=false;
                    fehler=true;
                }
                if (e!=0 &&e!=1){
                    Console.Write("Choose only from the given options.\n");
                    fehler=false;
                }
            } while(!fehler);
            if (ls) login(); else signup();
        }

        public static void login(){
            loginstruct lo=new loginstruct();

            using (StreamReader sr=new StreamReader("asd.txt")){
                string line;
                bool fehler=false;
                while ((line=sr.ReadLine())!=null&& !fehler){
                    do{
                        Console.Write("\n{0}\n{1}","LOGIN","Username or Email adress:");
                        lo.un=Console.ReadLine();
                        Console.Write("{0}","Password:");
                        lo.pw=Console.ReadLine();
                        bool UNcorrect=false;
                            do{
                            UNcorrect=line.Contains(lo.un);
                            if (!UNcorrect){
                                line=sr.ReadLine();
                            }
                            }while (!UNcorrect);
                        bool PWcorrect=false;
                        if (UNcorrect){
                            PWcorrect=line.Contains(decrypt(lo.pw));
                        }
                        if (UNcorrect &&PWcorrect){
                            Console.Write("Username matches with password. Access granted. Loading...");
                            fehler=true;
                        }
                        else{
                            Console.Write("Error: "+"Username and password do not match. "+"Try again.\n");
                            fehler=false;
                        }
                    } while (!fehler);
                }
            }
        }

        public static void signup(){
            loginstruct si=new loginstruct();
            using (StreamWriter sw=File.AppendText("asd.txt")){
                    Console.Write("\n{0}\n{1}","SIGNUP","Desired Username:");
                    si.un=Console.ReadLine();
                    bool fehler=false;
                    do {
                        try {
                            Console.Write("{0}","Pick a Password:");
                            si.pwsi=Console.ReadLine();
                            Console.Write("{0}","Retype Password:");
                            si.pwsi2=Console.ReadLine();
                            fehler=false;
                        }
                        catch (Exception ex){
                            fehler=true;
                            Console.Write("Error: "+ex.Message+" Try again.\n");
                        }
                    } while(fehler);

                    bool fehler2=false;
                    do {
                        try {
                            Console.Write("{0}","Email adress:");
                            si.email=(Console.ReadLine());
                            fehler2=false;
                        }
                        catch (Exception ex){
                            fehler2=true;
                            Console.Write("Error: "+ex.Message+" Enter again.\n");
                        }
                    } while(fehler2);
                    sw.WriteLine("{0},{1},{2}!",si.un,decrypt(si.pwsi),si.email);
            }
            login();
        }

        public static void Main(){
            LoginOrSignup();
            Console.ReadKey(true);
        }
    }
}