using System;
using System.Collections.Generic;
using System.Reactive;
using System.Windows.Forms;
using DispenserCommon.Aop;
using DispenserCommon.Ioc;
using DispenserCommon.Utils;
using DispenserCore.Context;
using DispenserCore.Model.DTO;
using DispenserCore.Service;
using ReactiveUI;
using LoginErrorWindow = DispenserUI.Views.Windows.LoginErrorWindow;

namespace DispenserUI.ViewModels.Login;

[Component, GlobalTry]
public class LoginVM : DynamicViewModel
{
    private readonly Dictionary<string, int> _errorTimes = new();

    private readonly GlobalSessionHolder _sessionHolder = ServiceLocator.GetService<GlobalSessionHolder>();

    // 用来记录登录错误告警情况，10分钟内异常超过3次则添加到小黑屋里面去
    private readonly SlidingWindow _slidingWindow = new(10 * 60 * 1000);
    private readonly UserService _userService = ServiceLocator.GetService<UserService>();
    private bool _isCapsLockIndicatorVisible;

    //订阅IsCapsLockOn、IsPwdTextBoxFocus
    private bool _isCapsLockOn;
    private bool _isPwdTextBoxFocus;

    private string _password;

    private bool _showError;

    private string _userName;

    public LoginVM()
    {
        Visible = false;
        CapsLockUpCommand = ReactiveCommand.Create(CapsLockUp);
        PwdTextBoxGotFocusCommand = ReactiveCommand.Create(PwdTextBoxGotFocus);
        PwdTextBoxLostFocusCommand = ReactiveCommand.Create(PwdTextBoxLostFocus);
        ToLogin = ReactiveCommand.Create(Login);
    }

    public string UserName
    {
        get => _userName;
        set => this.RaiseAndSetIfChanged(ref _userName, value);
    }

    public string Password
    {
        get => _password;
        set => this.RaiseAndSetIfChanged(ref _password, value);
    }


    public bool IsCapsLockIndicatorVisible
    {
        get => _isCapsLockIndicatorVisible;
        set => this.RaiseAndSetIfChanged(ref _isCapsLockIndicatorVisible, value);
    }

    public bool ShowError
    {
        get => _showError;
        set => this.RaiseAndSetIfChanged(ref _showError, value);
    }


    public ReactiveCommand<Unit, Unit> CapsLockUpCommand { get; }
    public ReactiveCommand<Unit, Unit> PwdTextBoxGotFocusCommand { get; }

    public ReactiveCommand<Unit, Unit> PwdTextBoxLostFocusCommand { get; }

    public ReactiveCommand<Unit, Unit> ToLogin { get; }

    private void CapsLockUp()
    {
        _isCapsLockOn = Control.IsKeyLocked(Keys.CapsLock);
        UpdateCapsLockIndicator();
    }

    private void PwdTextBoxGotFocus()
    {
        _isPwdTextBoxFocus = true;
        ShowError = false;
        UpdateCapsLockIndicator();
    }

    private void PwdTextBoxLostFocus()
    {
        _isPwdTextBoxFocus = false;
        ShowError = false;
        UpdateCapsLockIndicator();
    }

    private void UpdateCapsLockIndicator()
    {
        IsCapsLockIndicatorVisible = _isCapsLockOn && _isPwdTextBoxFocus;
    }

    /// <summary>
    ///     登录
    /// </summary>
    [Operation("用户登录")]
    private void Login()
    {
        try
        {
            // 如果登录异常次数超过3次，则提示用户
            if (_slidingWindow.Contains(UserName))
            {
                WindowUtil.ShowDialog(new LoginErrorWindow());
                // 清空当前的错误统计
                _errorTimes.Remove(UserName);
                return;
            }

            ShowError = false;

            // 进行登录验证
            var user = _userService.Login(UserName, Password);

            // 将登录结果记录下来
            _sessionHolder.SetSession(new Session(user));
        }
        catch (Exception e)
        {
            ShowError = true;
            _errorTimes.TryGetValue(UserName, out var times);
            times += 1;
            if (times >= 3)
            {
                // 添加到小黑屋，10分钟内不能进行登录
                _slidingWindow.AllowValue(UserName);
                return;
            }

            _errorTimes[UserName] = times;
        }
    }
}