using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.Core.Reports;
using InABox.WPF;

namespace InABox.DynamicGrid;

public interface IDynamicOneToManyGrid<TOne, TMany> : IDynamicEditorPage
{
    void LoadItems(TMany[] items);
}

public class DynamicOneToManyGrid<TOne, TMany> : DynamicGrid<TMany>,
    IDynamicEditorPage,
    IDynamicOneToManyGrid<TOne, TMany>
    where TOne : Entity, new() where TMany : Entity, IPersistent, IRemotable, new()
{
    private readonly PropertyInfo property;

    protected DynamicGridCustomColumnsComponent<TMany> ColumnsComponent;

    public DynamicOneToManyGrid()
    {
        Ready = false;
        Criteria = new Filters<TMany>();

        property = CoreUtils.GetOneToManyProperty(typeof(TMany), typeof(TOne));

        AddHiddenColumn(property.Name + "." + nameof(IEntityLink.ID));
        foreach (var col in LookupFactory.RequiredColumns<TMany>())
            HiddenColumns.Add(col);

        ColumnsComponent = new DynamicGridCustomColumnsComponent<TMany>(this, GetTag());

        DataComponent = new DynamicGridMemoryEntityDataComponent<TMany>(this);
        base.DataComponent = DataComponent;
    }

    protected new DynamicGridMemoryEntityDataComponent<TMany> DataComponent;

    protected override void Init()
    {
    }

    protected override void DoReconfigure(DynamicGridOptions options)
    {
        options.RecordCount = true;
        options.SelectColumns = true;

        if (Security.CanEdit<TMany>() && !ReadOnly)
        {
            options.AddRows = true;
            options.EditRows = true;
        }
        if (Security.CanDelete<TMany>() && !ReadOnly)
            options.DeleteRows = true;
        if (Security.CanImport<TMany>() && !ReadOnly)
            options.ImportData = true;
        if (Security.CanExport<TMany>())
            options.ExportData = true;
        if (Security.CanMerge<TMany>())
            options.MultiSelect = true;
    }

    private static bool IsAutoEntity => typeof(TMany).HasAttribute<AutoEntity>();

    protected Filters<TMany> Criteria { get; } = new Filters<TMany>();

    public TOne Item { get; protected set; }

    public void LoadItems(TMany[] items)
    {
        DataComponent.LoadData(items);
        Refresh(false, true);
    }

    private static string GetTag()
    {
        return typeof(TOne).Name + "." + typeof(TMany).Name;
    }

    #region IDynamicEditorPage

    public DynamicEditorGrid EditorGrid { get; set; }

    public PageType PageType => PageType.Other;

    public bool Ready { get; set; }

    private bool _readOnly;
    public bool ReadOnly
    {
        get => _readOnly;
        set
        {
            if (_readOnly != value)
            {
                _readOnly = value;
                Reconfigure();
            }
        }
    }

    public virtual void Load(object item, Func<Type, CoreTable?>? PageDataHandler)
    {
        Reconfigure();

        Item = (TOne)item;

        Refresh(true, false);

        var data = PageDataHandler?.Invoke(typeof(TMany));

        if(data is not null)
        {
            DataComponent.LoadData(data);
        }
        {
            if (Item.ID == Guid.Empty)
            {
                data = new CoreTable();
                data.LoadColumns(typeof(TMany));
                DataComponent.LoadData(data);
            }
            else
            {
                var criteria = new Filters<TMany>();
                var exp = CoreUtils.GetPropertyExpression<TMany>(property.Name + ".ID");
                criteria.Add(new Filter<TMany>(exp).IsEqualTo(Item.ID).And(exp).IsNotEqualTo(Guid.Empty));
                criteria.AddRange(Criteria.Items);
                var sort = LookupFactory.DefineSort<TMany>();

                var columns = DynamicGridUtils.LoadEditorColumns(DataColumns());

                DataComponent.LoadData(criteria.Combine(), columns, sort);
            }
        }

        Refresh(false, true);
        Ready = true;
    }

    public virtual void BeforeSave(object item)
    {
        // Don't need to do anything here
    }

    public virtual void AfterSave(object item)
    {
        foreach (var map in DataComponent.Items)
        {
            var prop = (property.GetValue(map) as IEntityLink)!;
            prop.ID = Item.ID;
            prop.Synchronise(Item);
        }

        DataComponent.SaveItems();
    }

    public Size MinimumSize()
    {
        return new Size(400, 400);
    }

    public string Caption()
    {
        var caption = typeof(TMany).GetCustomAttribute(typeof(Caption));
        if (caption != null)
            return ((Caption)caption).Text;
        var result = new Inflector.Inflector(new CultureInfo("en")).Pluralize(typeof(TMany).Name);
        return result;
    }

    public virtual int Order()
    {
        return int.MinValue;
    }

    #endregion

    #region DynamicGrid

    protected override bool CustomiseImportItem(TMany item)
    {
        var result = base.CustomiseImportItem(item);
        if (result)
        {
            var prop = (property.GetValue(item) as IEntityLink)!;
            prop.ID = Item.ID;
            prop.Synchronise(Item);
        }

        return result;
    }
    public override DynamicGridColumns GenerateColumns()
    {
        var cols = new DynamicGridColumns();
        cols.AddRange(base.GenerateColumns().Where(x => !x.ColumnName.StartsWith(property.Name + ".")));
        return cols;
    }

    protected override DynamicGridColumns LoadColumns()
    {
        return ColumnsComponent.LoadColumns();
    }

    protected override void SaveColumns(DynamicGridColumns columns)
    {
        ColumnsComponent.SaveColumns(columns);
    }
    protected override void LoadColumnsMenu(ContextMenu menu)
    {
        base.LoadColumnsMenu(menu);
        ColumnsComponent.LoadColumnsMenu(menu);
    }

    protected override DynamicGridSettings LoadSettings()
    {
        var tag = GetTag();

        var user = Task.Run(() => new UserConfiguration<DynamicGridSettings>(tag).Load());
        user.Wait();

        return user.Result;
    }
    protected override void SaveSettings(DynamicGridSettings settings)
    {
        var tag = GetTag();
        new UserConfiguration<DynamicGridSettings>(tag).Save(settings);
    }

    public override TMany CreateItem()
    {
        var result = new TMany();
        var prop = (property.GetValue(result) as IEntityLink)!;
        prop.ID = Item.ID;
        prop.Synchronise(Item);
        return result;
    }

    protected override BaseEditor? GetEditor(object item, DynamicGridColumn column)
    {
        var type = CoreUtils.GetProperty(typeof(TMany), column.ColumnName).DeclaringType;
        if (type.GetInterfaces().Contains(typeof(IEntityLink)) && type.ContainsInheritedGenericType(typeof(TOne)))
            return new NullEditor();
        return base.GetEditor(item, column);
    }

    public override DynamicEditorPages LoadEditorPages(TMany item)
    {
        return item.ID != Guid.Empty ? base.LoadEditorPages(item) : new DynamicEditorPages();
    }

    #endregion

}