using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;

using Microsoft.Win32;

using Wpf.Ui.Mvvm.Contracts;

using Bloxstrap.UI.Elements.Dialogs;
using System.Xml.Linq;

namespace Bloxstrap.UI.Elements.Menu.Pages
{
    /// <summary>
    /// Interaction logic for FastFlagEditorPage.xaml
    /// </summary>
    public partial class FastFlagEditorPage
    {
        // believe me when i say there is absolutely zero point to using mvvm for this
        // using a datagrid is a codebehind thing only and thats it theres literally no way around it

        private readonly ObservableCollection<FastFlag> _fastFlagList = new();
        private bool _showPresets = false;
        private string _searchFilter = "";

        public FastFlagEditorPage()
        {
            InitializeComponent();
        }

        private void ReloadList()
        {
            var selectedEntry = DataGrid.SelectedItem as FastFlag;

            _fastFlagList.Clear();

            var presetFlags = FastFlagManager.PresetFlags.Values;

            foreach (var pair in App.FastFlags.Prop.OrderBy(x => x.Key))
            {
                if (!_showPresets && presetFlags.Contains(pair.Key))
                    continue;

                if (!pair.Key.ToLower().Contains(_searchFilter.ToLower()))
                    continue;

                var entry = new FastFlag
                {
                    // Enabled = true,
                    Name = pair.Key,
                    Value = pair.Value.ToString()!
                };

                /* if (entry.Name.StartsWith("Disable"))
                {
                    entry.Enabled = false;
                    entry.Name = entry.Name[7..];
                } */

                _fastFlagList.Add(entry);
            }

            if (DataGrid.ItemsSource is null)
                DataGrid.ItemsSource = _fastFlagList;

            if (selectedEntry is null)
                return;

            var newSelectedEntry = _fastFlagList.Where(x => x.Name == selectedEntry.Name).FirstOrDefault();

            if (newSelectedEntry is null)
                return;
            
            DataGrid.SelectedItem = newSelectedEntry;
            DataGrid.ScrollIntoView(newSelectedEntry);
        }

        private void ClearSearch(bool refresh = true)
        {
            SearchTextBox.Text = "";
            _searchFilter = "";

            if (refresh)
                ReloadList();
        }

        // refresh list on page load to synchronize with preset page
        private void Page_Loaded(object sender, RoutedEventArgs e) => ReloadList();

        private void DataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            int index = e.Row.GetIndex();
            FastFlag entry = _fastFlagList[index];

            switch (e.Column.Header)
            {
                /* case "Enabled":
                    bool enabled = (bool)((CheckBox)e.EditingElement).IsChecked!;

                    if (enabled)
                    {
                        App.FastFlags.SetValue(entry.Name, entry.Value);
                        App.FastFlags.SetValue($"Disable{entry.Name}", null);
                    }
                    else
                    {
                        App.FastFlags.SetValue(entry.Name, null);
                        App.FastFlags.SetValue($"Disable{entry.Name}", entry.Value);
                    }

                    break; */

                case "Name":
                    var textbox = e.EditingElement as TextBox;

                    string oldName = entry.Name;
                    string newName = textbox!.Text;

                    if (newName == oldName)
                        return;

                    if (App.FastFlags.GetValue(newName) is not null)
                    {
                        Controls.ShowMessageBox("A FastFlag with this name already exists.", MessageBoxImage.Information);
                        e.Cancel = true;
                        textbox.Text = oldName;
                        return;
                    }

                    App.FastFlags.SetValue(oldName, null);
                    App.FastFlags.SetValue(newName, entry.Value);

                    if (!newName.Contains(_searchFilter))
                        ClearSearch();

                    break;

                case "Value":
                    string newValue = ((TextBox)e.EditingElement).Text;

                    App.FastFlags.SetValue(entry.Name, newValue);

                    break;
            }
        }

        private void BackButton_Click(object sender, RoutedEventArgs e)
        {
            if (Window.GetWindow(this) is INavigationWindow window)
                window.Navigate(typeof(FastFlagsPage));
        }

        private void AddButton_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new AddFastFlagDialog();
            dialog.ShowDialog();

            if (dialog.Result != MessageBoxResult.OK)
                return;

            string name = dialog.FlagNameTextBox.Text;
            
            FastFlag? entry;

            if (App.FastFlags.GetValue(name) is null)
            {
                entry = new FastFlag
                {
                    // Enabled = true,
                    Name = dialog.FlagNameTextBox.Text,
                    Value = dialog.FlagValueTextBox.Text
                };

                if (!name.Contains(_searchFilter))
                    ClearSearch();

                _fastFlagList.Add(entry);

                App.FastFlags.SetValue(entry.Name, entry.Value);
            }
            else
            {
                Controls.ShowMessageBox("An entry for this FastFlag already exists.", MessageBoxImage.Information);

                bool refresh = false;

                if (!_showPresets && FastFlagManager.PresetFlags.Values.Contains(name))
                {
                    TogglePresetsButton.IsChecked = true;
                    _showPresets = true;
                    refresh = true;
                }

                if (!name.Contains(_searchFilter))
                {
                    ClearSearch(false);
                    refresh = true;
                }

                if (refresh)
                    ReloadList();

                entry = _fastFlagList.Where(x => x.Name == name).FirstOrDefault();
            }

            DataGrid.SelectedItem = entry;
            DataGrid.ScrollIntoView(entry);
        }

        private void DeleteButton_Click(object sender, RoutedEventArgs e)
        {
            var tempList = new List<FastFlag>();

            foreach (FastFlag entry in DataGrid.SelectedItems)
                tempList.Add(entry);

            foreach (FastFlag entry in tempList)
            {
                _fastFlagList.Remove(entry);
                App.FastFlags.SetValue(entry.Name, null);
            }
        }

        private void ToggleButton_Click(object sender, RoutedEventArgs e)
        {
            if (sender is not ToggleButton button)
                return;

            _showPresets = button.IsChecked ?? false;
            ReloadList();
        }

        private void ImportJSONButton_Click(object sender, RoutedEventArgs e)
        {
            string json = "";
            Dictionary<string, object>? list = null;

            while (list is null)
            { 
                var dialog = new BulkAddFastFlagDialog();
                dialog.JsonTextBox.Text = json;
                dialog.ShowDialog();

                if (dialog.Result != MessageBoxResult.OK)
                    return;

                json = dialog.JsonTextBox.Text;

                try
                {
                    list = JsonSerializer.Deserialize<Dictionary<string, object>>(json);

                    if (list is null)
                        throw new Exception("JSON deserialization returned null");
                }
                catch (Exception ex) 
                {
                    Controls.ShowMessageBox(
                        "The JSON you've entered does not appear to be valid. Please double check it and try again.\n" +
                        "\n" +
                        "More information:\n" +
                        $"{ex.Message}",
                        MessageBoxImage.Error
                    );
                }
            }

            var conflictingFlags = App.FastFlags.Prop.Where(x => list.ContainsKey(x.Key)).Select(x => x.Key);
            bool overwriteConflicting = false;

            if (conflictingFlags.Any())
            {
                var result = Controls.ShowMessageBox(
                    "Some of the flags you are attempting to import already have set values. Would you like to overwrite their current values with the ones defined in the import?\n" +
                    "\n" +
                    "Conflicting flags:\n" +
                    String.Join(", ", conflictingFlags),
                    MessageBoxImage.Question,
                    MessageBoxButton.YesNo
                );

                overwriteConflicting = result == MessageBoxResult.Yes;
            }

            foreach (var pair in list)
            {
                if (App.FastFlags.Prop.ContainsKey(pair.Key) && !overwriteConflicting)
                    continue;

                App.FastFlags.SetValue(pair.Key, pair.Value);
            }

            ClearSearch();
        }

        private void SearchTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (sender is not TextBox textbox)
                return;

            _searchFilter = textbox.Text;
            ReloadList();
        }
    }
}