using Dalamud.Interface;
using Dalamud.Interface.Colors;
using Dalamud.Interface.Utility;
using Dalamud.Utility;
using ImGuiNET;
using MareSynchronos.FileCache;
using MareSynchronos.Localization;
using MareSynchronos.MareConfiguration;
using MareSynchronos.MareConfiguration.Models;
using MareSynchronos.Services;
using MareSynchronos.Services.Mediator;
using MareSynchronos.Services.ServerConfiguration;
using MareSynchronos.WebAPI;
using MareSynchronos.API.Dto.Account;
using MareSynchronos.API.Routes;
using Microsoft.Extensions.Logging;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Numerics;
using System.Reflection;
using System.Text.RegularExpressions;

namespace MareSynchronos.UI;

public partial class IntroUi : WindowMediatorSubscriberBase
{
    private readonly ApiController _apiController;
    private readonly MareConfigService _configService;
    private readonly CacheMonitor _cacheMonitor;
    private readonly Dictionary<string, string> _languages = new(StringComparer.Ordinal) { { "English", "en" }, { "Deutsch", "de" }, { "Français", "fr" } };
    private readonly ServerConfigurationManager _serverConfigurationManager;
    private readonly DalamudUtilService _dalamudUtilService;
    private readonly UiSharedService _uiShared;
    private int _currentLanguage;
    private bool _readFirstPage;

    private string _secretKey = string.Empty;
    private string _timeoutLabel = string.Empty;
    private Task? _timeoutTask;
    private string[]? _tosParagraphs;
    private bool _registrationInProgress = false;
    private bool _registrationSuccess = false;
    private string? _registrationMessage;
    private RegisterReplyDto? _registrationReply;

    public IntroUi(ILogger<IntroUi> logger, UiSharedService uiShared, MareConfigService configService,
        CacheMonitor fileCacheManager, ServerConfigurationManager serverConfigurationManager, MareMediator mareMediator,
        PerformanceCollectorService performanceCollectorService, DalamudUtilService dalamudUtilService) : base(logger, mareMediator, "Loporrit Setup", performanceCollectorService)
    {
        _uiShared = uiShared;
        _configService = configService;
        _cacheMonitor = fileCacheManager;
        _serverConfigurationManager = serverConfigurationManager;
        _dalamudUtilService = dalamudUtilService;
        IsOpen = false;
        ShowCloseButton = false;
        RespectCloseHotkey = false;

        SizeConstraints = new WindowSizeConstraints()
        {
            MinimumSize = new Vector2(650, 400),
            MaximumSize = new Vector2(650, 2000),
        };

        GetToSLocalization();

        Mediator.Subscribe<SwitchToMainUiMessage>(this, (_) => IsOpen = false);
        Mediator.Subscribe<SwitchToIntroUiMessage>(this, (_) =>
        {
            _configService.Current.UseCompactor = !dalamudUtilService.IsWine;
            IsOpen = true;
        });
    }

    protected override void DrawInternal()
    {
        if (_uiShared.IsInGpose) return;

        if (!_configService.Current.AcceptedAgreement && !_readFirstPage)
        {
            _uiShared.BigText("Welcome to Loporrit");
            ImGui.Separator();
            UiSharedService.TextWrapped("Loporrit is a plugin that will replicate your full current character state including all Penumbra mods to other paired users. " +
                              "Note that you will have to have Penumbra as well as Glamourer installed to use this plugin.");
            UiSharedService.TextWrapped("We will have to setup a few things first before you can start using this plugin. Click on next to continue.");

            UiSharedService.ColorTextWrapped("Note: Any modifications you have applied through anything but Penumbra cannot be shared and your character state on other clients " +
                                 "might look broken because of this or others players mods might not apply on your end altogether. " +
                                 "If you want to use this plugin you will have to move your mods to Penumbra.", ImGuiColors.DalamudYellow);
            if (!_uiShared.DrawOtherPluginState(intro: true)) return;
            ImGui.Separator();
            if (ImGui.Button("Next##toAgreement"))
            {
                _readFirstPage = true;
#if !DEBUG
                _timeoutTask = Task.Run(async () =>
                {
                    for (int i = 10; i > 0; i--)
                    {
                        _timeoutLabel = $"{Strings.ToS.ButtonWillBeAvailableIn} {i}s";
                        await Task.Delay(TimeSpan.FromSeconds(1)).ConfigureAwait(false);
                    }
                });
#else
                _timeoutTask = Task.CompletedTask;
#endif
            }
        }
        else if (!_configService.Current.AcceptedAgreement && _readFirstPage)
        {
            _uiShared.UidFont.Push();
            var textSize = ImGui.CalcTextSize(Strings.ToS.LanguageLabel);
            ImGui.TextUnformatted(Strings.ToS.AgreementLabel);
            _uiShared.UidFont.Pop();

            ImGui.SameLine();
            var languageSize = ImGui.CalcTextSize(Strings.ToS.LanguageLabel);
            ImGui.SetCursorPosX(ImGui.GetWindowContentRegionMax().X - ImGui.GetWindowContentRegionMin().X - languageSize.X - 80);
            ImGui.SetCursorPosY(ImGui.GetCursorPosY() + textSize.Y / 2 - languageSize.Y / 2);

            ImGui.TextUnformatted(Strings.ToS.LanguageLabel);
            ImGui.SameLine();
            ImGui.SetCursorPosY(ImGui.GetCursorPosY() + textSize.Y / 2 - (languageSize.Y + ImGui.GetStyle().FramePadding.Y) / 2);
            ImGui.SetNextItemWidth(80 * ImGuiHelpers.GlobalScale);
            if (ImGui.Combo("", ref _currentLanguage, _languages.Keys.ToArray(), _languages.Count))
            {
                GetToSLocalization(_currentLanguage);
            }

            ImGui.Separator();
            ImGui.SetWindowFontScale(1.5f);
            string readThis = Strings.ToS.ReadLabel;
            textSize = ImGui.CalcTextSize(readThis);
            ImGui.SetCursorPosX(ImGui.GetWindowSize().X / 2 - textSize.X / 2);
            UiSharedService.ColorText(readThis, ImGuiColors.DalamudRed);
            ImGui.SetWindowFontScale(1.0f);
            ImGui.Separator();

            UiSharedService.TextWrapped(_tosParagraphs![0]);
            UiSharedService.TextWrapped(_tosParagraphs![1]);
            UiSharedService.TextWrapped(_tosParagraphs![2]);
            UiSharedService.TextWrapped(_tosParagraphs![3]);
            UiSharedService.TextWrapped(_tosParagraphs![4]);
            UiSharedService.TextWrapped(_tosParagraphs![5]);

            ImGui.Separator();
            if (_timeoutTask?.IsCompleted ?? true)
            {
                if (ImGui.Button(Strings.ToS.AgreeLabel + "##toSetup"))
                {
                    _configService.Current.AcceptedAgreement = true;
                    _configService.Save();
                }
            }
            else
            {
                UiSharedService.TextWrapped(_timeoutLabel);
            }
        }
        else if (_configService.Current.AcceptedAgreement
                 && (string.IsNullOrEmpty(_configService.Current.CacheFolder)
                     || !_configService.Current.InitialScanComplete
                     || !Directory.Exists(_configService.Current.CacheFolder)))
        {
            _uiShared.UidFont.Push();
            ImGui.TextUnformatted("File Storage Setup");
            _uiShared.UidFont.Pop();
            ImGui.Separator();

            if (!_uiShared.HasValidPenumbraModPath)
            {
                UiSharedService.ColorTextWrapped("You do not have a valid Penumbra path set. Open Penumbra and set up a valid path for the mod directory.", ImGuiColors.DalamudRed);
            }
            else
            {
                UiSharedService.TextWrapped("To not unnecessary download files already present on your computer, Loporrit will have to scan your Penumbra mod directory. " +
                                     "Additionally, a local storage folder must be set where Loporrit will download other character files to. " +
                                     "Once the storage folder is set and the scan complete, this page will automatically forward to registration at a service.");
                UiSharedService.TextWrapped("Note: The initial scan, depending on the amount of mods you have, might take a while. Please wait until it is completed.");
                UiSharedService.ColorTextWrapped("Warning: once past this step you should not delete the FileCache.csv of Loporrit in the Plugin Configurations folder of Dalamud. " +
                                          "Otherwise on the next launch a full re-scan of the file cache database will be initiated.", ImGuiColors.DalamudYellow);
                UiSharedService.ColorTextWrapped("Warning: if the scan is hanging and does nothing for a long time, chances are high your Penumbra folder is not set up properly.", ImGuiColors.DalamudYellow);
                _uiShared.DrawCacheDirectorySetting();
            }

            if (!_cacheMonitor.IsScanRunning && !string.IsNullOrEmpty(_configService.Current.CacheFolder) && _uiShared.HasValidPenumbraModPath && Directory.Exists(_configService.Current.CacheFolder))
            {
                if (ImGui.Button("Start Scan##startScan"))
                {
                    _cacheMonitor.InvokeScan();
                }
            }
            else
            {
                _uiShared.DrawFileScanState();
            }
            if (!_dalamudUtilService.IsWine)
            {
                var useFileCompactor = _configService.Current.UseCompactor;
                if (ImGui.Checkbox("Use File Compactor", ref useFileCompactor))
                {
                    _configService.Current.UseCompactor = useFileCompactor;
                    _configService.Save();
                }
                UiSharedService.ColorTextWrapped("The File Compactor can save a tremendeous amount of space on the hard disk for downloads through Loporrit. It will incur a minor CPU penalty on download but can speed up " +
                    "loading of other characters. It is recommended to keep it enabled. You can change this setting later anytime in the Loporrit settings.", ImGuiColors.DalamudYellow);
            }
        }
        else if (!_uiShared.ApiController.ServerAlive)
        {
            _uiShared.UidFont.Push();
            ImGui.TextUnformatted("Service Registration");
            _uiShared.UidFont.Pop();
            ImGui.Separator();
            UiSharedService.TextWrapped("To be able to use Loporrit you will have to register an account.");
            UiSharedService.TextWrapped("Refer to the instructions at the location you obtained this plugin for more information or support.");

            ImGui.Separator();

            UiSharedService.TextWrapped("Once you have received a secret key you can connect to the service using the tools provided below.");

            ImGui.BeginDisabled(_registrationInProgress);
            _ = _uiShared.DrawServiceSelection(selectOnChange: true);

            var text = "Enter Secret Key";
            var buttonText = "Save";
            var buttonWidth = _secretKey.Length != 64 ? 0 : ImGuiHelpers.GetButtonSize(buttonText).X + ImGui.GetStyle().ItemSpacing.X;
            var textSize = ImGui.CalcTextSize(text);
            ImGui.AlignTextToFramePadding();
            ImGui.TextUnformatted(text);
            ImGui.SameLine();
            ImGui.SetNextItemWidth(UiSharedService.GetWindowContentRegionWidth() - ImGui.GetWindowContentRegionMin().X - buttonWidth - textSize.X);
            ImGui.InputText("", ref _secretKey, 64);
            if (_secretKey.Length > 0 && _secretKey.Length != 64)
            {
                UiSharedService.ColorTextWrapped("Your secret key must be exactly 64 characters long.", ImGuiColors.DalamudRed);
            }
            else if (_secretKey.Length == 64 && !HexRegex().IsMatch(_secretKey))
            {
                UiSharedService.ColorTextWrapped("Your secret key can only contain ABCDEF and the numbers 0-9.", ImGuiColors.DalamudRed);
            }
            else if (_secretKey.Length == 64)
            {
                ImGui.SameLine();
                if (ImGui.Button(buttonText))
                {
                    string keyName;
                    if (_serverConfigurationManager.CurrentServer == null) _serverConfigurationManager.SelectServer(0);
                    if (_registrationReply != null && _secretKey.Equals(_registrationReply.SecretKey, StringComparison.Ordinal))
                        keyName = _registrationReply.UID + $" (registered {DateTime.Now:yyyy-MM-dd})";
                    else
                        keyName = $"Secret Key added on Setup ({DateTime.Now:yyyy-MM-dd})";
                    _serverConfigurationManager.CurrentServer!.SecretKeys.Add(_serverConfigurationManager.CurrentServer.SecretKeys.Select(k => k.Key).LastOrDefault() + 1, new SecretKey()
                    {
                        FriendlyName = keyName,
                        Key = _secretKey,
                    });
                    _serverConfigurationManager.AddCurrentCharacterToServer();
                    _secretKey = string.Empty;
                    _ = Task.Run(() => _uiShared.ApiController.CreateConnections());
                }
            }

            if (_serverConfigurationManager.CurrentApiUrl.Equals(ApiController.LoporritServiceUri, StringComparison.Ordinal))
            {
                ImGui.BeginDisabled(_registrationInProgress || _registrationSuccess || _secretKey.Length > 0);
                ImGui.Separator();
                ImGui.TextUnformatted("If you do not have a secret key already click below to register a new account.");
                if (UiSharedService.NormalizedIconTextButton(FontAwesomeIcon.Plus, "Register a new Loporrit account"))
                {
                    _registrationInProgress = true;
                    _ = Task.Run(async () => {
                        try
                        {
                            using HttpClient httpClient = new();
                            var ver = Assembly.GetExecutingAssembly().GetName().Version;
                            httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("MareSynchronos", ver!.Major + "." + ver!.Minor + "." + ver!.Build));
                            var postUri = MareAuth.AuthRegisterFullPath(new Uri(_serverConfigurationManager.CurrentApiUrl
                                .Replace("wss://", "https://", StringComparison.OrdinalIgnoreCase)
                                .Replace("ws://", "http://", StringComparison.OrdinalIgnoreCase)));
                            _logger.LogInformation("Registering new account: {uri}", postUri.ToString());
                            var result = await httpClient.PostAsync(postUri, null).ConfigureAwait(false);
                            result.EnsureSuccessStatusCode();
                            var reply = await result.Content.ReadFromJsonAsync<RegisterReplyDto>().ConfigureAwait(false) ?? new();
                            if (!reply.Success)
                            {
                                _logger.LogWarning("Registration failed: {err}", reply.ErrorMessage);
                                _registrationMessage = reply.ErrorMessage;
                                if (_registrationMessage.IsNullOrEmpty())
                                    _registrationMessage = "An unknown error occured. Please try again later.";
                                return;
                            }
                            _registrationMessage = "New account registered.\nPlease keep a copy of your secret key in case you need to reset your plugins, or to use it on another PC.";
                            _secretKey = reply.SecretKey ?? "";
                            _registrationReply = reply;
                            _registrationSuccess = true;
                        }
                        catch (Exception ex)
                        {
                            _logger.LogWarning(ex, "Registration failed");
                            _registrationSuccess = false;
                            _registrationMessage = "An unknown error occured. Please try again later.";
                        }
                        finally
                        {
                            _registrationInProgress = false;
                        }
                    });
                }
                ImGui.EndDisabled(); // _registrationInProgress || _registrationSuccess
                if (_registrationInProgress)
                {
                    ImGui.TextUnformatted("Sending request...");
                }
                else if (!_registrationMessage.IsNullOrEmpty())
                {
                    if (!_registrationSuccess)
                        ImGui.TextColored(ImGuiColors.DalamudYellow, _registrationMessage);
                    else
                        ImGui.TextUnformatted(_registrationMessage);
                }
            }

            ImGui.EndDisabled(); // _registrationInProgress
        }
        else
        {
            Mediator.Publish(new SwitchToMainUiMessage());
            IsOpen = false;
        }
    }

    private void GetToSLocalization(int changeLanguageTo = -1)
    {
        if (changeLanguageTo != -1)
        {
            _uiShared.LoadLocalization(_languages.ElementAt(changeLanguageTo).Value);
        }

        _tosParagraphs = [Strings.ToS.Paragraph1, Strings.ToS.Paragraph2, Strings.ToS.Paragraph3, Strings.ToS.Paragraph4, Strings.ToS.Paragraph5, Strings.ToS.Paragraph6];
    }

    [GeneratedRegex("^([A-F0-9]{2})+")]
    private static partial Regex HexRegex();
}