using CSS_Solution.Request;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Serialization;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.StartPanel;

namespace CSS_Solution.Forms
{
    public partial class Welcome_Form : Form
    {
        public Welcome_Form()
        {
            InitializeComponent();
            if (Program.exceptionHandler == null)
                Initialize.default_logger.LogError($"[{DateTime.Now}] exceptionHandler为空？どうやって？");
            else
                Application.ThreadException += Program.exceptionHandler.ApplicationThreadExceptionHandler;

        }
        private Font normal_font = new Font("Microsoft YaHei UI", 15F, FontStyle.Regular, GraphicsUnit.Point, 134);
        private Font italic_font = new Font("Microsoft YaHei UI", 15F, FontStyle.Italic, GraphicsUnit.Point, 134);
        private MD5 MD5 = MD5.Create();
        private SHA1 SHA1 = SHA1.Create();

        private void ID_Enter(object sender, EventArgs e)
        {
            if (ID.Font != normal_font)
            {
                ID.Text = string.Empty;
                ID.ForeColor = Color.White;
                ID.Font = normal_font;
            }
        }

        private void ID_Leave(object sender, EventArgs e)
        {
            if (ID.Text == string.Empty)
            {
                ID.ForeColor = Color.Silver;
                ID.Font = italic_font;
                ID.Text = "学号...";
            }
        }

        private void password_Enter(object sender, EventArgs e)
        {
            if (password.Font != normal_font)
            {
                password.Text = string.Empty;
                password.ForeColor = Color.White;
                password.Font = normal_font;
                password.PasswordChar = '*';
            }
        }

        private void password_Leave(object sender, EventArgs e)
        {
            if (password.Text == string.Empty)
            {
                password.ForeColor = Color.Silver;
                password.Font = italic_font;
                password.Text = "密码...";
                password.PasswordChar = '\0';
            }
        }
        bool save_disk_info_showed = false;
        private void SavePassword_CheckedChanged(object sender, EventArgs e)
        {

            if (sender == null || save_disk_info_showed)
                return;
            CheckBox? checkBox = sender as CheckBox;
            if (checkBox == null) return;
            if (checkBox.Checked)
            {
                save_disk_info_showed = true;
                MessageBox.Show("注意，密码确实会保存为密文，但是该密文可直接用于登录网站（教务管理系统），理想状态下，该密码应当仅保存在内存中。");
            }
        }
        private void record_Click(object sender, EventArgs e)
        {
            try
            {
                var (username, password) = Code_Preprocess();
                Code_Save(username, password);
                if (MessageBox.Show("是否进行一次登录测试，以确保账号密码正确？", "测试输入？", MessageBoxButtons.YesNo) == DialogResult.Yes)
                    Task.Run(() => Code_TestAsync());
                else
                    Show_info("信息已记录");
            }
            catch (Exception ex)
            {
                Show_info(ex.Message);
            }
        }
        private void test_Click(object sender, EventArgs e)
        {
            try
            {
                var (username, password) = Code_Preprocess();
                if(username!=Settings.etc.Username||password!=Settings.etc.Password)
                    Code_Save(username ,password);
                Task.Run(()=>Code_TestAsync());
            }
            catch (Exception ex)
            {
                Show_info(ex.Message);
            }
        }
        private void Code_Save(string username, string password)
        {
            if (SavePassword.CheckState == CheckState.Checked)
                Settings.etc.Write_Code_To_File(username, password);
            Settings.etc.Username = username;
            Settings.etc.Password = password;
        }
        private async Task Code_TestAsync()
        {
            Invoke(() => info.Text = "测试中，可能需要一点时间");
            bool status = false;
            string error_info = "";
            await Task.Run(() =>
            {
                bool not_done = true;
                try
                {
                    Task_handler.index_Task_Handler.Make_request((result) =>
                    {
                        Task_handler.login_Task_Handler.Make_request((fresult) =>
                        {
                            not_done = false;
                            status = !fresult.isError();
                            error_info = fresult.Error_info;
                        }, result);
                    });
                }
                catch (Exception ex)
                {
                    status = false;
                    error_info = ex.Message;
                }
                while (not_done) ;
            });
            Invoke(() => { if (status) Show_info("测试成功"); else Show_info("测试失败" + error_info); });
        }
        private (string,string) Code_Preprocess()
        {
            string username = ID.Text, password = this.password.Text;
            if (username == null || username.Length == 0)
                throw new InvalidOperationException("账号不能为空");
            if (password == null || password.Length == 0)
                throw new InvalidOperationException("怕密码泄露可以不用");
            password = username + password;
            username = Convert.ToHexString(MD5.ComputeHash(Encoding.UTF8.GetBytes(username))).ToLower();
            password = Convert.ToHexString(SHA1.ComputeHash(Encoding.UTF8.GetBytes(password))).ToLower();
            if (!Settings.etc.Agree_use)
                if (MessageBox.Show("你需要为自己造成的后果负责，同一个账号的大量请求可不是什么正常的事，作者不会也无法对任何后果负责", "Are you sure about that?", MessageBoxButtons.YesNo) == DialogResult.No)
                    throw new Exception("Wise choice");
                else
                    Settings.etc.Do_Agree_use();
            return (username, password);
        }
        private void errorInfo_CountDown_Tick(object sender, EventArgs e)
        {
            errorInfo_CountDown.Enabled = false;
            info.Visible = false;
        }
        private void Show_info(string s)
        {
            info.Text = s;
            info.Visible = true;
            errorInfo_CountDown.Enabled = true;
        }

    }
}