using System;
using System.Collections;
using System.IO;
using System.Text;
using System.Windows.Forms;

namespace NJCIT
{
    public partial class LoginForm : Form
    {
        
        private static bool isAutoLogin = false;
        private static bool isRemember = true;
        private static string path = "./config.ini";
        private static int domain;
        private static string userName;
        private static string password;
        
        private Form mainForm;

        public LoginForm(Form form)
        {
            this.mainForm = form;
            InitializeComponent();
        }

        // 窗口载入时执行的操作
        private void LoginForm_Load(object sender, EventArgs e)
        {
            ReadConfig();
            // 检查用户在线状态
            if (!LoginServer.Logouted)
            {
                if (LoginServer.Online)
                {
                    //MessageBox.Show("用户已登录", "登录提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    ChangeForm();
                }
                else if(isAutoLogin)
                {
                    this.AutoLogin();
                }
            }
        }

        // 用户名
        private void TextBox_UserName_TextChanged(object sender, EventArgs e)
        {
            userName = TextBox_Username.Text;
        }

        // 认证域
        private void ComboBox_Domain_SelectedIndexChanged(object sender, EventArgs e)
        {
            domain = ComboBox_Domain.SelectedIndex; ;
        }

        // 密码
        private void TextBox_Password_TextChanged(object sender, EventArgs e)
        {
            password = StringToBase64(TextBox_Password.Text);
        }

        // 自动登录按钮
        private void CheckBox_AutoLogin_CheckedChanged(object sender, EventArgs e)
        {
            if (CheckBox_AutoLogin.Checked)
            {
                CheckBox_Remember.Checked = true;
            }
        }

        //保存密码按钮
        private void CheckBox_Remember_CheckedChanged(object sender, EventArgs e)
        {
            if (!CheckBox_Remember.Checked)
            {
                CheckBox_AutoLogin.Checked = false;
            }
        }

        // 登录按钮
        private void Button_Login_Click(object sender, EventArgs e)
        {
            if (TextBox_Username.Text.Length == 0)
            {
                MessageBox.Show("用户名不能为空！", "登录提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                TextBox_Username.Focus();
                return;
            }
            if (TextBox_Password.Text.Length == 0)
            {
                MessageBox.Show("密码不能为空！", "登录提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                TextBox_Password.Focus();
                return;
            }
            this.AutoLogin();
        }

        private void TextBox_Username_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Button_Login.PerformClick();
            }
        }

        private void TextBox_Password_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Button_Login.PerformClick();
            }
        }

        private void CheckBox_AutoLogin_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Button_Login.PerformClick();
            }
        }

        private void CheckBox_Remember_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Button_Login.PerformClick();
            }
        }

        private void LoginForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!LoginServer.Online)
            {
                Environment.Exit(0);
            }
        }

        // 登录操作
        private void AutoLogin()
        {
            LoginServer.DoLogin(userName, domain, password);
            if (LoginServer.Online)
            {
                this.ChangeForm();
                WriteConfig();   
            }
            else
            {
                ArrayList list = LoginServer.GetInformation();
                if (list == null)
                {
                    MessageBox.Show("登录失败，请检查您的互联网连接状态！", "登录提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                {
                    MessageBox.Show(list[0].ToString(), "登录提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        // 切换窗体
        private void ChangeForm()
        {
            this.mainForm.Show();
            this.Close();
        }

        // 编码转换
        private static string StringToBase64(string str)
        {
            byte[] bytes = Encoding.ASCII.GetBytes(str);
            return Convert.ToBase64String(bytes, 0, bytes.Length);
        }

        // 编码转换
        private static string Base64ToString(string str)
        {
            try
            {
                byte[] bytes = Convert.FromBase64String(str);
                return Encoding.ASCII.GetString(bytes);
            }
            catch (Exception)
            {
                return "";
            }
        }

        // 读取配置
        private void ReadConfig()
        {
            // 读取配置
            if (!File.Exists(path))
            {
                try
                {
                    File.Create(path).Close();
                }
                catch (Exception)
                {
                }
            }
            isAutoLogin = OperateIniFile.ReadIniData("Settings", "AutoLogin", "0", path).Equals("1") ? true : false;
            isRemember = OperateIniFile.ReadIniData("Settings", "SavePassword", "1", path).Equals("1") ? true : false;
            try
            {
                domain = Int32.Parse(OperateIniFile.ReadIniData("Account", "Domain", "0", path));
            }
            catch (Exception)
            {
                domain = 0;
            }
            userName = OperateIniFile.ReadIniData("Account", "UserName", "", path);
            password = OperateIniFile.ReadIniData("Account", "Password", "", path);
            CheckBox_AutoLogin.Checked = isAutoLogin;
            CheckBox_Remember.Checked = isRemember;
            TextBox_Username.Text = userName;
            ComboBox_Domain.SelectedIndex = domain;
            TextBox_Password.Text = Base64ToString(password);
        }

        // 保存配置
        private void WriteConfig()
        {
            isAutoLogin = CheckBox_AutoLogin.Checked;
            isRemember = CheckBox_Remember.Checked;
            userName = TextBox_Username.Text;
            domain = ComboBox_Domain.SelectedIndex;
            password = StringToBase64(TextBox_Password.Text);
            OperateIniFile.WriteIniData("Settings", "AutoLogin", isAutoLogin ? "1" : "0", path);
            OperateIniFile.WriteIniData("Settings", "SavePassword", isRemember ? "1" : "0", path);
            OperateIniFile.WriteIniData("Account", "UserName", userName, path);
            OperateIniFile.WriteIniData("Account", "Domain", domain.ToString(), path);
            OperateIniFile.WriteIniData("Account", "Password", isRemember ? password : "", path);
        }

        private void toolStripButton_about_Click(object sender, EventArgs e)
        {
            new AboutForm().ShowDialog();
        }

        private void toolStripButton_help_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process.Start("http://xueye.io/njcit-lan-help.html");
        }
    }
}