using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net.Mail;
using MySql.Data.MySqlClient;
using System.Web.UI;
using System.IO;

public class RestorePswd
{
    public static void CanRestore(string username, string email, Page page)
    {
        if (username == "" || email == "")
        {
            SweetAlertCustom.SendCustomAlert(page, "Please fill all the boxes.", "ALERT!", "OK", SweetAlertCustom.types.error);
            return;
        }
        if (username.Length > 15 || email.Length > 40)
        {
            SweetAlertCustom.SendCustomAlert(page, "Wrong input.", "ALERT!", "OK", SweetAlertCustom.types.error);
            return;
        }
        string path = Constants.GlobalAccountsPath + username + ".txt";
        if (File.Exists(path))
        {
            string Data = File.ReadAllText(path);
            if (Data == email)
            {
                using (SmtpClient client = new SmtpClient())
                {
                    client.Host = "smtp.gmail.com";
                    client.Port = 587;
                    client.EnableSsl = true;
                    client.DeliveryMethod = SmtpDeliveryMethod.Network;
                    client.Credentials = new System.Net.NetworkCredential("dukepaypal97@gmail.com", "bbmmtmi99Z");
                    client.Timeout = 600000;
                    using (MailMessage mm = new MailMessage("dukepaypal97@gmail.com", email, "Password Recovery", GetRecoveryContent(username)))
                        client.Send(mm);
                }
                SweetAlertCustom.SendCustomAlert(page, "Your new password has been sent on your email.", "SUCCESS!", "OK", SweetAlertCustom.types.success);
            }
        }
    }
    public static bool ValidToken(string token, string username)
    {
        string path = Constants.PasswordRecoverPath + username + ".txt";
        if (!File.Exists(path))
            return false;
        string[] data = File.ReadAllLines(path);
        if (data[0] != token)
            return false;
        if (DateTime.FromBinary(long.Parse(data[1])) > DateTime.Now.AddHours(24))
        {
            File.Delete(path);
            return false;
        }
        return true;
    }
    static char[] Alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz".ToArray();
    static Random rnd = new Random();
    public static string RandomToken()
    {
        string ps = "";
        for (int i = 0; i < 50; i++)
            ps += Alphabets[rnd.Next(0, Alphabets.Length)];
        return ps;
    }
    public static string GetRecoveryContent(string username)
    {
        string path = Constants.PasswordRecoverPath + username + ".txt";
        string Token = RandomToken();
        if (File.Exists(path))
            File.Delete(path);
        string[] textlines = new string[2];
        textlines[0] = Token;
        textlines[1] = DateTime.Now.ToBinary().ToString();
        File.WriteAllLines(path, textlines);
        string link = "http://164.132.192.3/reset?token=" + Token + "&user=" + username;
        string content = "Hello " + username + ",\n\nYou have requested a password recovery link!\n\nPlease follow this link and enter your new password.\n\n" + link + "\nThis link will expire after 24 hours from now!\n\nThanks,\nPureClassic Team.";
        return content;
    }
    public static void DirectChange(string username, string newpass, Page page)
    {
        if (username == "" || newpass == "") page.Response.Redirect("Home");
        string path = Constants.GlobalAccountsPath + username + ".usr";
        if (File.Exists(path))
            File.Delete(path);
        MemoryStream ms = new MemoryStream();
        BinaryWriter BW = new BinaryWriter(ms);
        BW.Write(newpass);
        BW.Write("");
        byte[] buffer = ms.ToArray();
        BW.Close();
        ms.Close();
        File.WriteAllBytes(Constants.GlobalAccountsPath + username + ".usr", buffer);
        File.Delete(Constants.PasswordRecoverPath + username + ".txt");
        SweetAlertCustom.SendCustomAlert(page, "Your password has changed successfully!.", "Success", "COOL", SweetAlertCustom.types.success);
    }
}