using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
using System.Windows;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Messaging;
using Livia.Models;
using Livia.Models.Data;
using Livia.Properties;
using Livia.Utility;
using Livia.ViewModels.Utility;
using Livia.Views.Utility;
using Microsoft.Extensions.Logging;

namespace Livia.ViewModels;

public class ReportModuleItemViewModel : ObservableObject, ISelectableItem
{
    public bool IsChecked { get => _isChecked; set => SetProperty(ref _isChecked, value); }
    public string Name { get; }
    public object Value { get; }


    private bool _isChecked = true;
    public ReportModuleItemViewModel(string name, object value, bool isChecked = true)
    {
        Name = name;
        Value = value;
        IsChecked = isChecked;
    }
}

public class ReportModuleExpanderViewModel : ObservableObject
{
    public string Name { get; }
    public string Type { get; }
    public bool Visible => ModuleItemCollection.Items.Count > 0;
    public SelectableObservableCollection<ReportModuleItemViewModel> ModuleItemCollection { get; } = new();


    public ReportModuleExpanderViewModel(string name, string type, IEnumerable<ReportModuleItemViewModel> list)
    {
        Name = name;
        Type = type;
        ModuleItemCollection.AddRange(list);
    }
}

public class SelectReportModuleWindowViewModel : ObservableObject, IDisposable, IRecipient<LogoutMessage>, IRecipient<IdleTimerTickMessage>
{
    public event EventHandler? OnRequestClose;

    public static string DefaultReportName => Application.Current.TryFindResource("DefaultReportName") as string ?? "Report1";
    public bool Processing { get => _processing; private set => SetProperty(ref _processing, value); }
    public bool ReportModuleAal { get => _reportModuleAal; set => SetProperty(ref _reportModuleAal, value); }
    public bool ShowRoiLocation { get => _showRoiLocation; set => SetProperty(ref _showRoiLocation, value); }
    public string ReportName { get => _reportName; set => SetProperty(ref _reportName, value); }
    public string Language { get => _language; set => SetProperty(ref _language, value); }
    public ObservableCollection<ReportModuleExpanderViewModel> ModuleGroups { get; } = [];
    public IPatientInfoManager PatientInfoManager { get; }
    
    private readonly IDataBlockLoader _dataBlockLoader;
    private readonly IServerHandler _serverHandler;
    private readonly IWarningSystem _warningSystem;
    private readonly ILogger _logger;
    private readonly CancellationTokenSource _cancellationTokenSource = new();
    private bool _processing;
    private bool _reportModuleAal = true;
    private bool _showRoiLocation = true;
    private string _reportName;
    private string _language;

    public SelectReportModuleWindowViewModel(ILiviaControlViewModel liviaControlViewModel, IServerHandler serverHandler, IWarningSystem warningSystem, IPatientInfoManager patientInfoManager, ILogger logger, IDataBlockLoader blockLoader)
    {
        _serverHandler = serverHandler;
        _warningSystem = warningSystem;
        PatientInfoManager = patientInfoManager;
        _logger = logger;
        _dataBlockLoader = blockLoader;
        _reportName = DefaultReportName;
        List<ReportModuleExpanderViewModel> viewModels = liviaControlViewModel.GenerateReportModuleGroups();
        foreach (ReportModuleExpanderViewModel reportModuleExpanderViewModel in viewModels)
        {
            ModuleGroups.Add(reportModuleExpanderViewModel);
        }

        _language = Settings.Default.Language;
        WeakReferenceMessenger.Default.RegisterAll(this);
    }

    private SelectReportModuleJson GenerateJson(bool overrideSameName)
    {
        ReportModules reportModules = new()
        {
            BrainRoi = true,
            ShowRoiLocation = ShowRoiLocation,
            ReportModuleAal = Settings.Default.ShowReportModuleAalCheckbox && ReportModuleAal,
            RegionalPerfusion = [],
            ParamColorImg = [],
            Cbf = [],
            Att = [],
            Acbv = [],
            AnteriorAspects = [],
            PosteriorAspects = [],
            RestrictedDiffusion = []
        };

        //TODO::is this good approach?
        foreach (ReportModuleExpanderViewModel viewModel in ModuleGroups)
        {
            List<object> selectedItems = (from reportModuleItemViewModel in viewModel.ModuleItemCollection.Items where reportModuleItemViewModel.IsChecked select reportModuleItemViewModel.Value).ToList();
            switch (viewModel.Type)
            {
                case "regional_perfusion":
                    reportModules.RegionalPerfusion.AddRange(selectedItems);
                    break;
                case "param_color_img":
                    reportModules.ParamColorImg.AddRange(selectedItems);
                    break;
                case "cbf":
                    reportModules.Cbf.AddRange(selectedItems);
                    break;
                case "att":
                    reportModules.Att.AddRange(selectedItems);
                    break;
                case "acbv":
                    reportModules.Acbv.AddRange(selectedItems);
                    break;
                case "anterior_aspects":
                    reportModules.AnteriorAspects.AddRange(selectedItems);
                    break;
                case "posterior_aspects":
                    reportModules.PosteriorAspects.AddRange(selectedItems);
                    break;
                case "restricted_diffusion":
                    reportModules.RestrictedDiffusion.AddRange(selectedItems);
                    break;
                default:
                    _logger.LogError("Unknown Report Module type {type}", viewModel.Type);
                    break;
            }
        }

        SelectReportModuleJson json = new()
        {
            Anonymous = PatientInfoManager.AnonymousMode,
            Key = _dataBlockLoader.CurrentDisplayingDataBlock?.Key ?? "",
            Language = LiviaUtility.GetLanguageOnlyString(Language),
            Title = ReportName,
            Override = overrideSameName,
            DisplayModules = reportModules
        };

        return json;
    }

    public bool CheckReportNameValid()
    {
        if (ReportName.Length is not (0 or > 20) && ReportName.IndexOfAny(Path.GetInvalidFileNameChars()) == -1)
            return true;
        _warningSystem.ShowDialog(WarningWindowKind.Warning, true, "ReportNameWarning");
        return false;
    }

    public async Task<bool> SelectReportModule(string fileName)
    {
        Processing = true;
        bool overrideSameName = !Settings.Default.ShowSelectReportModuleDialog;
        while (true)
        {
            (bool success, string messageIndex) = await _serverHandler.SelectReportModule(fileName, GenerateJson(overrideSameName), _cancellationTokenSource.Token).ConfigureAwait(false);
            if (success)
            {
                _warningSystem.ShowDialog(WarningWindowKind.Info, true, messageIndex);
                if (!Settings.Default.OpenReportOnFinish) 
                    return true;

                try
                {
                    Process.Start("explorer.exe", fileName);
                }
                catch (Exception e)
                {
                    _logger.LogError(e, "Error opening {path}", fileName);
                }
            }
            else if (messageIndex == "ServerError10035")
            {
                bool confirm = _warningSystem.ShowDialog(WarningWindowKind.Confirmation, true, messageIndex) ?? false;
                if (confirm)
                {
                    overrideSameName = true;
                    continue;
                }
            }
            else if (_cancellationTokenSource.Token.IsCancellationRequested)
            {
                _logger.LogInformation("SelectReportModule canceled");
            }
            else
            {
                _warningSystem.ShowDialog(WarningWindowKind.Warning, false, messageIndex);
            }

            Processing = false;
            return success;
        }
    }

    public void Receive(LogoutMessage message)
    {
        //TODO::not sure if it is safe
        if (!Processing)
            OnRequestClose?.Invoke(this, EventArgs.Empty);
    }
    
    public void Receive(IdleTimerTickMessage message)
    {
        if (Processing)
            message.IdleTimer.ResetTimer();
    }

    public void Dispose()
    {
        WeakReferenceMessenger.Default.UnregisterAll(this);
    }
}