using Comal.Classes;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using InABox.WPF.Themes;
using NPOI.SS.Formula.Functions;
using System.Collections.ObjectModel;
using InABox.Clients;
using InABox.Wpf;
using InABox.Wpf.Reports;

namespace PRSDesktop;

/// <summary>
/// Interaction logic for JobRequisitionsPanel.xaml
/// </summary>
public partial class ReservationManagementPanel : UserControl, IPanel<JobRequisitionItem>
{
    private ReservationManagementGlobalSettings _globalSettings = null!; // Initialised in Setup()

    private DynamicSplitPanelView CurrentView;

    private List<PurchaseOrder> PurchaseOrders = new List<PurchaseOrder>();

    public ReservationManagementPanel()
    {
        InitializeComponent();

        CurrentView = SplitPanel.View;

        JobRequiItems.Reconfigure(options =>
        {
            var canMultiSelect = Mode != PanelMode.Reserve || SplitPanel.View == DynamicSplitPanelView.Master;
            if(canMultiSelect)
            {
                options.Add(DynamicGridOption.MultiSelect);
            }
            else
            {
                options.Remove(DynamicGridOption.MultiSelect);
            }
        });
    }

    enum PanelMode
    {
        Reserve,
        Purchase
    }

    private PanelMode Mode { get; set; }

    private void SelectDetailButton(Button button)
    {
        reserveBtn.Background = new SolidColorBrush(Colors.WhiteSmoke);
        reserveBtn.Foreground = new SolidColorBrush(Colors.Black);
        foreach(var btn in PurchaseOrderButtons.Children.OfType<Button>())
        {
            btn.Background = new SolidColorBrush(Colors.WhiteSmoke);
            btn.Foreground = new SolidColorBrush(Colors.Black);
        }
        AddPOButton.Background = new SolidColorBrush(Colors.WhiteSmoke);
        AddPOButton.Foreground = new SolidColorBrush(Colors.Black);
        button.Background = ThemeManager.SelectedTabItemBackgroundBrush;
        button.Foreground = ThemeManager.SelectedTabItemForegroundBrush;
    }

    private void Reconfigure()
    {
        JobRequiItems.Reconfigure();
        OnUpdateDataModel?.Invoke(SectionName, DataModel(Selection.None));
    }

    private void SelectReserved()
    {
        SelectDetailButton(reserveBtn);

        reserveCol.Width = new System.Windows.GridLength(1, System.Windows.GridUnitType.Star);
        purchaseCol.Width = new System.Windows.GridLength(0);

        if(Mode != PanelMode.Reserve)
        {
            Mode = PanelMode.Reserve;
            Reconfigure();
        }
    }
    private void SelectNewPurchaseOrder()
    {
        SelectDetailButton(AddPOButton);

        reserveCol.Width = new System.Windows.GridLength(0);
        purchaseCol.Width = new System.Windows.GridLength(1, System.Windows.GridUnitType.Star);

        if (Mode != PanelMode.Purchase)
        {
            Mode = PanelMode.Purchase;
            Reconfigure();
        }

        purchasing.LoadFromRequiLine(Guid.Empty);
    }
    private void SelectPurchaseOrder(Button button, PurchaseOrder order)
    {
        SelectDetailButton(button);

        reserveCol.Width = new System.Windows.GridLength(0);
        purchaseCol.Width = new System.Windows.GridLength(1, System.Windows.GridUnitType.Star);

        if (Mode != PanelMode.Purchase)
        {
            Mode = PanelMode.Purchase;
            Reconfigure();
        }

        purchasing.LoadFromRequiLine(order.ID);
    }

    public bool IsReady { get; set; }

    public string SectionName => "Job Requisitions";

    public event DataModelUpdateEvent? OnUpdateDataModel;

    public void CreateToolbarButtons(IPanelHost host)
    {
        ProductSetupActions.Standard(host);
        host.CreateSetupAction(new PanelAction() { Caption = "Reservation Management Settings", Image = PRSDesktop.Resources.specifications, OnExecute = ConfigSettingsClick });

        if(Mode == PanelMode.Purchase && SplitPanel.IsDetailVisible())
        {
            var sectionName = SupplierPurchaseOrderPanel.SectionName;
            var dataModel = SupplierPurchaseOrderPanel.DataModel(Array.Empty<Guid>());
            var reports = ReportUtils.LoadReports(sectionName, dataModel);
            foreach(var report in reports)
            {
                host.CreateReport(PanelHost.CreateReportAction(report, (selection) =>
                {
                    Guid[] ids;
                    if(selection == Selection.None)
                    {
                        ids = Array.Empty<Guid>();
                    }
                    else
                    {
                        ids = PurchaseOrders.Select(x => x.ID).ToArray();
                    }
                    return SupplierPurchaseOrderPanel.DataModel(ids);
                }));
            }
        }
    }

    private void ConfigSettingsClick(PanelAction obj)
    {
        var grid = new DynamicItemsListGrid<ReservationManagementGlobalSettings>();
        if(grid.EditItems(new ReservationManagementGlobalSettings[] { _globalSettings }))
        {
            new GlobalConfiguration<ReservationManagementGlobalSettings>().Save(_globalSettings);
            holdings.CompanyDefaultStyle = _globalSettings.ProductStyle;
            JobRequiItems.DueDateAlert = _globalSettings.DueDateAlert;
            JobRequiItems.DueDateWarning = _globalSettings.DueDateWarning;
        }
    }

    public DataModel DataModel(Selection selection)
    {
        var ids = JobRequiItems.ExtractValues(x => x.ID, selection).ToArray();
        return new BaseDataModel<JobRequisitionItem>(new Filter<JobRequisitionItem>(x => x.ID).InList(ids));
    }

    public void Heartbeat(TimeSpan time)
    {

    }

    public void Refresh()
    {
        JobRequiItems.Refresh(false, true);
    }

    public Dictionary<string, object[]> Selected()
    {
        return new Dictionary<string, object[]>
        {
            [typeof(JobRequisitionItem).EntityName()] = JobRequiItems.SelectedRows
        };
    }

    public void Setup()
    {
        SelectReserved();

        JobRequiItems.OnSelectItem += OnJobRequiItemSelected;
        JobRequiItems.Refresh(true, false);

        _globalSettings = new GlobalConfiguration<ReservationManagementGlobalSettings>().Load();

        JobRequiItems.DueDateAlert = _globalSettings.DueDateAlert;
        JobRequiItems.DueDateWarning = _globalSettings.DueDateWarning;
        
        holdings.CompanyDefaultStyle = _globalSettings.ProductStyle;
        holdings.OnHoldingsReviewRefresh += Holdings_OnHoldingsReviewRefresh;

        purchasing.OnPurchaseOrderSaved += Refresh;
    }

    private void OnJobRequiItemSelected(object sender, DynamicGridSelectionEventArgs e)
    {
        if (SplitPanel.IsDetailVisible())
        {
            holdings.Item = e.Rows?.FirstOrDefault()?.ToObject<JobRequisitionItem>();
            RefreshPurchaseOrderButtons();
        }
    }

    private void RefreshPurchaseOrderButtons()
    {
        var requiIDs = JobRequiItems.SelectedRows
            .Select(x => x.Get<JobRequisitionItem, Guid>(x => x.ID))
            .ToArray();

        var pos = Client.Query(
            new Filter<PurchaseOrder>(x => x.ID).InQuery(
                new Filter<JobRequisitionItemPurchaseOrderItem>(x => x.JobRequisitionItem.ID)
                    .InList(requiIDs),
                x => x.PurchaseOrderItem.PurchaseOrderLink.ID),
            new Columns<PurchaseOrder>(x => x.ID)
                .Add(x => x.PONumber))
            .ToObjects<PurchaseOrder>().ToList();
        PurchaseOrders = pos;

        PurchaseOrderButtons.Children.Clear();
        var buttons = new List<(Button btn, PurchaseOrder po)>();
        foreach (var po in pos)
        {
            var button = new Button
            {
                Content = po.PONumber,
                Height = 30,
                FontWeight = FontWeights.DemiBold,
                BorderBrush = new SolidColorBrush(Colors.DarkGray),
                BorderThickness = new Thickness(1.25),
                Margin = new Thickness(2, 0, 0, 2),
                Padding = new Thickness(13, 3, 13, 3)
            };
            button.Click += (o, e) =>
            {
                SelectPurchaseOrder(button, po);
            };
            buttons.Add((button, po));
            PurchaseOrderButtons.Children.Add(button);
        }
        if (Mode == PanelMode.Purchase)
        {
            if (buttons.Count == 0)
            {
                SelectNewPurchaseOrder();
            }
            else
            {
                var btn = buttons[0];
                SelectPurchaseOrder(btn.btn, btn.po);
            }
        }
        else if (Mode == PanelMode.Reserve)
        {
            SelectReserved();
        }
    }

    private void Holdings_OnHoldingsReviewRefresh()
    {
        Refresh();
    }

    private void CheckSaved(CancelEventArgs cancel)
    {
        if (!SplitPanel.IsDetailVisible() || !purchasing.EditorChanged)
        {
            return;
        }
        var result = MessageWindow.ShowYesNoCancel("You have changes that have not been saved; do you wish to save these changes?", "Save Changes?");
        if (result == MessageWindowResult.Yes)
        {
            purchasing.Editor.SaveItem(cancel);
            if (!cancel.Cancel)
            {
                MessageWindow.ShowMessage("Purchase Order saved.", "Success");
            }
        }
        else if (result == MessageWindowResult.Cancel)
        {
            cancel.Cancel = true;
        }
    }

    public void Shutdown(CancelEventArgs? cancel)
    {
        if(cancel is not null && purchasing.EditorChanged)
        {
            CheckSaved(cancel);
        }
    }

    private void ReserveStock_Clicked(object sender, System.Windows.RoutedEventArgs e)
    {
        SelectReserved();
    }

    private void Purchasing_Drop(object sender, DragEventArgs e)
    {
        if(DynamicGridUtils.TryGetDropData(e, out var type, out var table))
        {
            if(type == typeof(JobRequisitionItem))
            {
                purchasing.DropItems(table.Rows);
            }
        }
    }

    private void AddPOButton_Click(object sender, RoutedEventArgs e)
    {
        SelectNewPurchaseOrder();
    }

    private void SplitPanel_OnChanged(object sender, DynamicSplitPanelSettings e)
    {
        JobRequiItems.Reconfigure();
        if(CurrentView != e.View)
        {
            CurrentView = e.View;
            if (e.View != DynamicSplitPanelView.Master)
            {
                Refresh();
            }
        }
    }
}