using Comal.Classes;
using FastReport;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.Core.Reports;
using InABox.DynamicGrid;
using InABox.Scripting;
using InABox.Wpf;
using InABox.Wpf.Reports;
using InABox.WPF;
using PRSDesktop.Configuration;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace PRSDesktop;

public interface IPanelHostControl
{
    void ClearActions();

    void CreatePanelAction(PanelAction action);

    void ClearReports();

    void CreateReport(PanelAction action);
}

public class PanelHost : IPanelHost
{
    public IBasePanel? CurrentPanel { get; private set; }
    public string CurrentModuleName { get; private set; } = "";

    private readonly IPanelHostControl HostControl;
    private readonly List<IPanelActionItem> SetupActions = new();

    public PanelHost(IPanelHostControl hostControl)
    {
        HostControl = hostControl;
    }

    #region Module Tracking

    private int TrackedClicks;
    private int TrackedKeys;
    private DateTime TrackedTicks = DateTime.MinValue;

    public void IncrementTrackingModuleClick()
    {
        if (CurrentPanel is not null)
            TrackedClicks++;
    }
    public void IncrementTrackingModuleKey()
    {
        if (CurrentPanel is not null)
            TrackedKeys++;
    }

    #endregion

    #region IPanelHost

    void IPanelHost.CreatePanelAction(PanelAction action)
    {
        HostControl.CreatePanelAction(action);
    }

    void IPanelHost.CreateReport(PanelAction action)
    {
        HostControl.CreateReport(action);
    }

    void IPanelHost.CreateSetupAction(PanelAction action)
    {
        SetupActions.Add(action);
    }

    void IPanelHost.CreateSetupSeparator()
    {
        SetupActions.Add(new PanelActionSeparator());
    }

    #endregion

    #region Panel Properties

    private void InitializePanelProperties(IBasePanel panel)
    {
        var propertiesInterface = panel.GetType().GetInterfaceDefinition(typeof(IPropertiesPanel<>));
        if (propertiesInterface is not null)
        {
            var propertiesType = propertiesInterface.GenericTypeArguments[0];
            var method = typeof(PanelHost)
                .GetMethod(nameof(InitializePanelPropertiesGeneric), BindingFlags.NonPublic | BindingFlags.Instance)
                ?.MakeGenericMethod(panel.GetType(), propertiesType)
                .Invoke(this, new object?[] { panel });
        }
    }
    private void InitializePanelPropertiesGeneric<TPanel, TProperties>(TPanel panel)
        where TPanel : IPropertiesPanel<TProperties>
        where TProperties : BaseObject, IGlobalConfigurationSettings, new()
    {
        panel.Properties = LoadPanelProperties<TPanel, TProperties>();
    }
    private TProperties LoadPanelProperties<TPanel, TProperties>()
        where TPanel : IPropertiesPanel<TProperties>
        where TProperties : BaseObject, IGlobalConfigurationSettings, new()
    {
        var config = new GlobalConfiguration<TProperties>();
        return config.Load();
    }

    private void SavePanelProperties<TPanel, TProperties>(TProperties properties)
        where TPanel : IPropertiesPanel<TProperties>
        where TProperties : BaseObject, IGlobalConfigurationSettings, new()
    {
        var config = new GlobalConfiguration<TProperties>();
        config.Save(properties);
    }
    private void EditPanelProperties<TPanel, TProperties>()
        where TPanel : IPropertiesPanel<TProperties>
        where TProperties : BaseObject, IGlobalConfigurationSettings, new()
    {
        var properties = LoadPanelProperties<TPanel, TProperties>();

        bool result;
        if (DynamicGridUtils.TryFindDynamicGrid(typeof(DynamicGrid<>), typeof(TProperties), out var gridType))
        {
            var grid = (Activator.CreateInstance(gridType) as DynamicGrid<TProperties>)!;
            result = grid.EditItems(new TProperties[] { properties });
        }
        else
        {
            var grid = new DynamicItemsListGrid<TProperties>();
            result = grid.EditItems(new TProperties[] { properties });
        }

        if (result)
        {
            SavePanelProperties<TPanel, TProperties>(properties);
        }
    }

    private void ConfigurePanel()
    {
        if (CurrentPanel is null) return;

        var propertiesInterface = CurrentPanel.GetType().GetInterfaceDefinition(typeof(IPropertiesPanel<>))!;
        var propertiesType = propertiesInterface.GenericTypeArguments[0];
        var basemethod = typeof(PanelHost)
            .GetMethod(nameof(EditPanelProperties), BindingFlags.NonPublic | BindingFlags.Instance);
        if (basemethod == null)
            return;
        var method = basemethod?.MakeGenericMethod(CurrentPanel.GetType(), propertiesType);
        if (method != null)
            method.Invoke(this, Array.Empty<object?>());
    }

    #endregion

    #region Actions

    private void ReloadActions(string sectionName, DataModel model)
    {
        SetupActions.Clear();
        HostControl.ClearActions();
        HostControl.ClearReports();

        CreateModules(sectionName, model);
        if (CurrentPanel != null)
        {
            CurrentPanel.CreateToolbarButtons(this);
        }
        CreateReports(sectionName, model);
    }

    #endregion

    #region Custom Modules

    private void CreateModules(string section, DataModel model)
    {
        if (ClientFactory.IsSupported<CustomModule>())
        {
            foreach (var (module, image) in CustomModuleUtils.LoadCustomModuleThumbnails(section, model))
            {
                HostControl.CreatePanelAction(new PanelAction
                {
                    Caption = module.Name ?? "",
                    Image = image,
                    OnExecute = (action) =>
                    {
                        ClickModule(action, module);
                    }
                });
            }
        }
    }

    private void ClickModule(PanelAction action, CustomModule code)
    {
        if (CurrentPanel != null)
        {
            if (!string.IsNullOrWhiteSpace(code.Script))
                try
                {
                    Selection selection;
                    if (code.SelectedRecords && code.AllRecords)
                        selection = RecordSelectionDialog.Execute();
                    else if (code.SelectedRecords)
                        selection = Selection.Selected;
                    else if (code.AllRecords)
                        selection = Selection.All;
                    else
                        selection = Selection.None;

                    var result = ScriptDocument.RunCustomModule(CurrentPanel.DataModel(selection), CurrentPanel.Selected(), code.Script);
                    if (result)
                        CurrentPanel.Refresh();
                }
                catch (CompileException c)
                {
                    MessageWindow.ShowError(c.Message, c, shouldLog: false);
                }
                catch (Exception err)
                {
                    MessageWindow.ShowError($"Unable to load {action.Caption}", err);
                }
            else
                MessageWindow.ShowMessage("Unable to load " + action.Caption, "Error", image: MessageWindow.WarningImage);
        }
    }

    private void ManageModules(PanelAction action)
    {
        if (CurrentPanel != null)
        {
            var section = CurrentPanel.SectionName;
            var dataModel = CurrentPanel.DataModel(Selection.Selected);

            var manager = new CustomModuleManager()
            {
                Section = section,
                DataModel = dataModel
            };
            manager.ShowDialog();

            ReloadActions(section, dataModel);
        }
    }

    #endregion

    #region Reports

    private IEnumerable<ReportExportDefinition> AddTemplateDefinitions()
    {
        if (CurrentPanel is null)
            return new List<ReportExportDefinition>() { new ReportExportDefinition("Email Report", PRSDesktop.Resources.email, ReportExportType.PDF,
                            PRSEmailUtils.DoEmailReport)};
        else
            return PRSEmailUtils.CreateTemplateDefinitions(CurrentPanel.DataModel(Selection.None));
    }

    public static PanelAction CreateReportAction(ReportTemplate template, Func<Selection, DataModel> getDataModel)
    {
        var action = new PanelAction
        {
            Caption = template.Name,
            Image = PRSDesktop.Resources.printer,
            OnExecute = (action) =>
            {
                PrintReport(template.ID, getDataModel);
            }
        };

        if (Security.IsAllowed<CanDesignReports>())
        {
            var menu = new ContextMenu();
            menu.AddItem("Design Report", PRSDesktop.Resources.pencil, () => DesignReport(template.ID, getDataModel));
            action.Menu = menu;
        }
        return action;
    }

    private void CreateReports(string section, DataModel model)
    {
        if (CurrentPanel is null) return;

        var client = new Client<ReportTemplate>();
        var templates = ReportUtils.LoadReports(section, model, new Columns<ReportTemplate>(x => x.ID, x => x.Name));

        foreach (var template in templates)
        {
            HostControl.CreateReport(CreateReportAction(template, CurrentPanel.DataModel));
        }
    }

    private static void DesignReport(Guid templateID, Func<Selection, DataModel> getDataModel)
    {
        var template = new Client<ReportTemplate>().Load(new Filter<ReportTemplate>(x => x.ID).IsEqualTo(templateID)).FirstOrDefault();
        if (template is null)
        {
            Logger.Send(LogType.Error, "", $"No Report Template with ID '{templateID}'");
            MessageWindow.ShowMessage("Report does not exist!", "Error", image: MessageWindow.WarningImage);
            return;
        }

        ReportUtils.DesignReport(template, getDataModel(Selection.None));
    }

    private static void PrintReport(Guid id, Func<Selection, DataModel> getDataModel)
    {
        var template = new Client<ReportTemplate>().Load(new Filter<ReportTemplate>(x => x.ID).IsEqualTo(id)).FirstOrDefault();
        if (template == null)
        {
            Logger.Send(LogType.Error, "", $"No Report Template with ID '{id}'");
            MessageWindow.ShowMessage("Report does not exist!", "Error", image: MessageWindow.WarningImage);
            return;
        }

        var selection = Selection.None;

        if (template.SelectedRecords && template.AllRecords)
            selection = RecordSelectionDialog.Execute();
        else if (template.SelectedRecords)
            selection = Selection.Selected;
        else if (template.AllRecords)
            selection = Selection.All;
        else
            MessageWindow.ShowMessage(
                "Report must have either [Selected Records] or [All Records] checked to display!",
                "Error",
                image: MessageWindow.WarningImage);
        if (selection != Selection.None)
            ReportUtils.PreviewReport(template, getDataModel(selection), false, Security.IsAllowed<CanDesignReports>());
    }

    private void ManageReports(PanelAction action)
    {
        if (CurrentPanel is null)
            return;

        var section = CurrentPanel.SectionName;
        var model = CurrentPanel.DataModel(Selection.None);
        if (model == null)
        {
            MessageWindow.ShowMessage("No DataModel for " + CurrentPanel.SectionName, "No DataModel");
            return;
        }

        var form = new ReportManager { DataModel = model, Section = section, Populate = true };
        form.ShowDialog();

        ReloadActions(section, model);
    }

    private void ManageEmailTemplates(PanelAction action)
    {
        if (CurrentPanel is null)
            return;

        var section = CurrentPanel.SectionName;
        var model = CurrentPanel.DataModel(Selection.None);
        if (model == null)
        {
            MessageWindow.ShowMessage("No DataModel for " + section, "No DataModel");
            return;
        }

        var window = new EmailTemplateManagerWindow(model);
        window.ShowDialog();
    }

    #endregion


    #region Public Interface

    public void InitialiseSetupMenu(ContextMenu menu)
    {
        var items = new List<IPanelActionItem>();

        items.AddRange(SetupActions);
        items.Add(new PanelActionSeparator());

        if (Security.IsAllowed<CanCustomiseModules>())
        {
            items.Add(new PanelAction("Custom Modules", PRSDesktop.Resources.script, ManageModules));
        }
        if (Security.IsAllowed<CanDesignReports>())
        {
            items.Add(new PanelAction("Reports", PRSDesktop.Resources.printer, ManageReports));
        }
        if (Security.IsAllowed<CanDesignReports>())
        {
            items.Add(new PanelAction("Email Templates", PRSDesktop.Resources.email, ManageEmailTemplates));
        }

        for (var i = 0; i < items.Count; ++i)
        {
            var item = items[i];
            if (item is PanelAction setupAction)
            {
                menu.AddItem(setupAction.Caption, setupAction.Image, setupAction, setupAction.OnExecute);
            }
            else if (item is PanelActionSeparator && i > 0 && i < items.Count - 1)
            {
                var last = items[i - 1];
                if (last is not PanelActionSeparator)
                    menu.AddSeparator();
            }
        }
        if (CurrentPanel?.GetType().HasInterface(typeof(IPropertiesPanel<>)) == true && Security.IsAllowed<CanConfigurePanels>())
        {
            var securityInterface = CurrentPanel?.GetType().GetInterfaceDefinition(typeof(IPropertiesPanel<,>));

            var canConfigure = false;
            if (securityInterface is not null)
            {
                var token = securityInterface.GenericTypeArguments[1];
                canConfigure = Security.IsAllowed(token);
            }
            else
            {
                canConfigure = Security.IsAllowed<CanConfigurePanels>();
            }
            if (canConfigure)
            {
                menu.AddItem("Configure Panel", PRSDesktop.Resources.edit, ConfigurePanel);
            }
        }

        if (menu.Items.Count == 0)
        {
            menu.AddItem("No Items", null, null, false);
        }
    }

    public IBasePanel LoadPanel(Type T, string moduleName)
    {
        return (LoadPanelMethod.MakeGenericMethod(T).Invoke(this, new object[] { moduleName })
            as IBasePanel)!;
    }

    private static readonly MethodInfo LoadPanelMethod = typeof(PanelHost)
        .GetMethods().First(x => x.Name == nameof(LoadPanel) && x.IsGenericMethod);

    public T LoadPanel<T>(string moduleName) where T : class, IBasePanel, new()
    {
        var panel = new T();
        CurrentPanel = panel;

        ReportUtils.ExportDefinitions.Clear();
        ReportUtils.ExportDefinitions.AddRange(AddTemplateDefinitions());

        InitializePanelProperties(panel);

        CurrentModuleName = moduleName;
        TrackedTicks = DateTime.Now;

        CurrentPanel.IsReady = false;
        CurrentPanel.Setup();
        CurrentPanel.IsReady = true;

        CurrentPanel.OnUpdateDataModel += ReloadActions;

        var model = CurrentPanel.DataModel(Selection.None);
        var section = CurrentPanel.SectionName;

        ReloadActions(section, model);

        return panel;
    }

    public void Refresh()
    {
        CurrentPanel?.Refresh();
    }

    private void Heartbeat(TimeSpan time, bool closing)
    {
        if (!closing && time.TotalMinutes < 5)
            return;

        TrackedTicks = DateTime.Now;

        if (CurrentPanel is not null)
        {
            //Logger.Send(LogType.Information, "", string.Format("Heartbeat: {0}", CurrentPanel_Label));
            if (ClientFactory.IsSupported<ModuleTracking>())
            {
                var keys = TrackedKeys;
                TrackedKeys = 0;
                var clicks = TrackedClicks;
                TrackedClicks = 0;

                var tracking = new ModuleTracking
                {
                    Date = DateTime.Today,
                    Module = CurrentModuleName,
                    Clicks = clicks,
                    Keys = keys,
                    ActiveTime = clicks + keys > 0 ? time : new TimeSpan(),
                    IdleTime = clicks + keys == 0 ? time : new TimeSpan()
                };
                tracking.User.ID = ClientFactory.UserGuid;
                new Client<ModuleTracking>().Save(tracking, "", (mt, ex) => { });
            }

            CurrentPanel.Heartbeat(time);
        }
    }

    public void Heartbeat()
    {
        Heartbeat(DateTime.Now - TrackedTicks, false);
    }

    public void UnloadPanel(CancelEventArgs? cancel)
    {
        if (CurrentPanel != null)
        {
            Heartbeat(DateTime.Now - TrackedTicks, true);
            try
            {
                CurrentPanel.Shutdown(cancel);
                if (cancel?.Cancel == true)
                {
                    return;
                }
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Error, ClientFactory.UserID, string.Format("Error in UnloadPanel(): {0}\n{1}", e.Message, e.StackTrace));
            }

            TrackedTicks = DateTime.MinValue;
            CurrentModuleName = "";
            TrackedClicks = 0;
            TrackedKeys = 0;
        }
    }

    #endregion
}