using System;
using System.Text;
using System.Windows;
using System.Security.Cryptography;

namespace SicUI
{
    /// <summary>
    /// WinDataView.xaml 的交互逻辑
    /// </summary>
    public partial class EditorPassChangeView : Window
    {
        private string _sPassword = "";
        
        //
        public string Password { get
            {
                return _sPassword; }
            set
            {
                _sPassword = value;
            }
                }

        Models.RecipeEditors.RecipeEditorViewModel revm = null;

        public EditorPassChangeView(Object obj)
        {
            InitializeComponent();
            //
            revm = obj as Models.RecipeEditors.RecipeEditorViewModel;

        }



        private void Button_Click(object sender, RoutedEventArgs e)
        {

            var sCurPass = CurPass.Password;
            var sNewPass1 = NewPass1.Password;
            var sNewPass2 = NewPass2.Password;
            //
            if(sCurPass.Length == 0)
            {
                MessageBox.Show("Current Password can't be empty.", "Error", MessageBoxButton.OK,
                    MessageBoxImage.Error);
                return;
            }
            if(sNewPass1.Length == 0)
            {
                MessageBox.Show("Please input the New Password.", "Error", MessageBoxButton.OK,
                    MessageBoxImage.Error);
                return;
            }
            if(sNewPass2.Length == 0)
            {
                MessageBox.Show("Please input the Confirm Password.","Error", MessageBoxButton.OK,
                    MessageBoxImage.Error) ;
                return;
            }
            if(sNewPass1 != sNewPass2)
            {
                MessageBox.Show("The new passwords are different.","Error", MessageBoxButton.OK,
                    MessageBoxImage.Error);
                return;
            }
            if(!CheckPass(sCurPass))
            {
                MessageBox.Show("Current password is wrong.","Error", MessageBoxButton.OK,
                    MessageBoxImage.Error);
                return;
            }
            //
            if (WriteNewPass(sNewPass1))
            {
                MessageBox.Show("Password has been changed successfully.","Succeeded", MessageBoxButton.OK,
                    MessageBoxImage.Information);
                Close();
            }
            else
            {
                MessageBox.Show("It is failed to save new password.","Error", MessageBoxButton.OK,
                    MessageBoxImage.Error);
            }
                 
        }

        private bool CheckPass(string sPassword)
        {
            if(Password == "0")
            {
                //初始值，未修改过密码
                return true;
            }
            //
            MD5 m = MD5.Create();
            byte[] bPass = Encoding.UTF8.GetBytes(sPassword);
            byte[] md5bPass = m.ComputeHash(bPass);
            string sPass = "";
            for(int i=0;i<md5bPass.Length;i++)
            {
                sPass += md5bPass[i].ToString("X2");
            }

            return  sPass == Password;
        }
        private bool WriteNewPass(string sPassword)
        {
            //
            try
            {
                MD5 m = MD5.Create();
                byte[] bPass = Encoding.UTF8.GetBytes(sPassword);
                byte[] md5bPass = m.ComputeHash(bPass);
                string sPass = "";
                for (int i = 0; i < md5bPass.Length; i++)
                {
                    sPass += md5bPass[i].ToString("X2");
                }
                //
                if (revm != null)
                {
                    return revm.ChanagePasswordReal(sPass);
                }
                else
                {
                    return false;
                }
            }
            catch
            {
                return false;
            }
            //
            return true;
        }
    }
}