using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using Pf2e.Scrapper.Processors.Attributes;
using Pf2e.Scrapper.Processors.Collection;
using CheckBox = System.Windows.Controls.CheckBox;

namespace Pf2e.Scrapper.WPF.StartForm.Components;

/// <summary>
/// Логика взаимодействия для ProcessorCollectionControl.xaml
/// </summary>
internal partial class ProcessorCollectionControl : System.Windows.Controls.UserControl
{
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public ProcessorCollection Collection
    {
        get => _collection;
        set
        {
            _collection = value;
            SetContent();
        }
    }
    private ProcessorCollection _collection = null!;

    public ProcessorCollectionControl()
    {
        InitializeComponent();
    }

    private Dictionary<ProcessorGroupEnum, CheckBox> GroupCheckBoxes { get; } = [];

    private Dictionary<ProcessorGroupEnum, bool?> GroupLastStats { get; } = [];

    private Dictionary<string, CheckBox> ItemCheckBoxes { get; } = [];

    private void SetContent()
    {
        RootPanel.Children.Clear();

        foreach (ProcessorGroupEnum group in Enum.GetValues<ProcessorGroupEnum>())
        {
            GroupCheckBoxes[group] = new()
            {
                Content = group.ToString(),
                IsThreeState = true,
                Style = (Style)Resources["HeaderCheckbox"]!,
            };

            GroupCheckBoxes[group].Click += GroupCheckBox_Click;

            System.Windows.Controls.Border border = new()
            {
                Style = (Style)Resources["ElementBorder"]!,
            };

            System.Windows.Controls.WrapPanel wrapPanel = new()
            {
                Style = (Style)Resources["ElementPanelStyle"]!,
            };

            foreach (ProcessorRecord item in Collection.AllItems.Where(item => item.Group == group))
            {
                ItemCheckBoxes[item.Name] = new()
                {
                    Content = item.Description,
                    ToolTip = item.Name,
                    IsChecked = item.Active,
                    Style = (Style)Resources["ElementCheckBox"]!,
                };

                ItemCheckBoxes[item.Name].Click += ItemCheckBox_Click;

                wrapPanel.Children.Add(ItemCheckBoxes[item.Name]);
            }

            border.Child = wrapPanel;

            RootPanel.Children.Add(GroupCheckBoxes[group]);
            RootPanel.Children.Add(border);
        }

        UpdateContent();
    }

    private void UpdateContent()
    {
        GroupLastStats.Clear();
        List<string> checkedItems = [];

        foreach ((string key, CheckBox? checkBox) in ItemCheckBoxes)
        {
            ProcessorRecord item = Collection[key];
            bool isChecked = checkBox.IsChecked ?? false;

            if (GroupLastStats.TryGetValue(item.Group, out bool? state))
            {
                /*
                 *        | true    | false     | null
                 *        | Checked | Unchecked | Indeterminate
                 * -------+---------+-----------+---------------
                 *  true  | true    | null      | null
                 *  false | null    | false     | null
                 */

                GroupLastStats[item.Group] =
                    isChecked && state == true ? true
                    : !isChecked && state == false ? false
                    : null;
            }
            else
            {
                GroupLastStats[item.Group] = isChecked;
            }

            if (isChecked)
            {
                checkedItems.Add(key);
            }
        }

        foreach ((ProcessorGroupEnum groupEnum, CheckBox? checkBox) in GroupCheckBoxes)
        {
            checkBox.IsChecked = GroupLastStats.GetValueOrDefault(groupEnum, null);
        }

        Collection.FilterProcessors(checkedItems);
    }

    private void GroupCheckBox_Click(object sender, RoutedEventArgs e)
    {
        CheckBox groupCheckBox = (CheckBox)sender;

        ProcessorGroupEnum groupEnum = GroupCheckBoxes
            .First(pair => pair.Value == groupCheckBox)
            .Key;

        groupCheckBox.IsChecked =
            GroupLastStats[groupEnum] is null || groupCheckBox.IsChecked is not null;

        foreach (
            (string _, CheckBox checkBox) in ItemCheckBoxes.Where(pair =>
                Collection[pair.Key].Group == groupEnum
            )
        )
        {
            checkBox.IsChecked = groupCheckBox.IsChecked;
        }

        UpdateContent();
    }

    private void ItemCheckBox_Click(object sender, RoutedEventArgs e)
    {
        UpdateContent();
    }
}