// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Options;
using Roslyn.Utilities;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.Options;
 
internal partial class InternalOptionsControl : AbstractOptionPageControl
{
    private readonly IEnumerable<IOption2> _options;
 
    public InternalOptionsControl(IEnumerable<IOption2> options, OptionStore optionStore)
        : base(optionStore)
    {
        _options = options;
 
        // options
        var optionsPanel = new StackPanel();
        this.AddOptions(optionsPanel);
 
        // scroll
        var viewer = new ScrollViewer()
        {
            VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
            HorizontalScrollBarVisibility = ScrollBarVisibility.Auto
        };
 
        viewer.Content = optionsPanel;
 
        // search 
        var searchBox = new TextBox() { MinWidth = 200, HorizontalAlignment = HorizontalAlignment.Stretch };
 
        var searchButton = new Button() { Content = "Search" };
        searchButton.Click += (o, a) =>
        {
            foreach (var item in optionsPanel.Children.OfType<CheckBox>())
            {
                var title = item.Content as string;
                if (title == null)
                {
                    continue;
                }
 
                // pattern not match
                if (title.IndexOf(searchBox.Text, StringComparison.OrdinalIgnoreCase) < 0)
                {
                    // hide it
                    item.Visibility = Visibility.Collapsed;
                }
                else
                {
                    item.Visibility = Visibility.Visible;
                }
            }
        };
 
        var clearButton = new Button() { Content = "Clear" };
        clearButton.Click += (o, a) => optionsPanel.Children.OfType<CheckBox>().Do(c => c.Visibility = Visibility.Visible);
 
        var searchPanel = new StackPanel()
        {
            Orientation = Orientation.Horizontal,
            Margin = new Thickness(5),
            HorizontalAlignment = HorizontalAlignment.Stretch
        };
 
        searchPanel.Children.Add(searchBox);
        searchPanel.Children.Add(searchButton);
        searchPanel.Children.Add(clearButton);
 
        // button
        var checkAllButton = new Button() { Content = "Check All" };
        checkAllButton.Click += (o, a) => optionsPanel.Children.OfType<CheckBox>().Where(c => c.Visibility == Visibility.Visible).Do(c => c.IsChecked = true);
 
        var uncheckAllButton = new Button() { Content = "Uncheck All" };
        uncheckAllButton.Click += (o, a) => optionsPanel.Children.OfType<CheckBox>().Where(c => c.Visibility == Visibility.Visible).Do(c => c.IsChecked = false);
 
        var selectionPanel = new StackPanel()
        {
            Orientation = Orientation.Horizontal,
            Margin = new Thickness(5),
            HorizontalAlignment = HorizontalAlignment.Stretch
        };
 
        selectionPanel.Children.Add(checkAllButton);
        selectionPanel.Children.Add(uncheckAllButton);
 
        // main panel
        var mainPanel = new DockPanel() { HorizontalAlignment = HorizontalAlignment.Stretch };
        mainPanel.Children.Add(searchPanel);
        mainPanel.Children.Add(selectionPanel);
        mainPanel.Children.Add(viewer);
 
        DockPanel.SetDock(searchPanel, Dock.Top);
        DockPanel.SetDock(selectionPanel, Dock.Bottom);
 
        this.Content = mainPanel;
    }
 
    protected virtual void AddOptions(Panel panel)
    {
        foreach (var option in _options)
        {
            if (!option.IsPerLanguage)
            {
                AddOption(panel, option);
            }
            else
            {
                AddPerLanguageOption(panel, option, LanguageNames.CSharp);
                AddPerLanguageOption(panel, option, LanguageNames.VisualBasic);
            }
        }
    }
 
    protected void AddOption(Panel panel, IOption2 option, string additional = null)
    {
        var uiElement = CreateControl(option, additional: additional);
        if (uiElement != null)
        {
            panel.Children.Add(uiElement);
        }
    }
 
    protected void AddPerLanguageOption(Panel panel, IOption2 option, string languageName, string additional = null)
    {
        var uiElement = CreateControl(option, languageName, additional);
        if (uiElement != null)
        {
            panel.Children.Add(uiElement);
        }
    }
 
    private UIElement CreateControl(IOption2 option, string languageName = null, string additional = null)
    {
        // Underscores in WPF mean that the next character is the access key for keyboard navigation
        // but thats not why our option names have underscores. Also removing them looks nicer.
        var optionDisplay = option.Definition.ConfigName.Replace('_', ' ') + GetLanguage(languageName) + GetAdditionalText(additional);
 
        if (option.Type == typeof(bool))
        {
            var checkBox = new CheckBox() { Content = optionDisplay };
            BindToCheckBox(checkBox, option, languageName);
            return checkBox;
        }
 
        if (option.Type == typeof(int))
        {
            var label = new Label() { Content = optionDisplay };
            var textBox = new TextBox();
            BindToTextBox(textBox, option, languageName);
 
            var panel = new StackPanel();
            panel.Children.Add(label);
            panel.Children.Add(textBox);
 
            AddSearchHandler(label);
 
            return panel;
        }
 
        return null;
    }
 
    private static string GetAdditionalText(string additional)
    {
        if (additional == null)
        {
            return string.Empty;
        }
 
        return " [" + additional + "]";
    }
 
    private static string GetLanguage(string languageName)
    {
        if (languageName == null)
        {
            return string.Empty;
        }
 
        return " [" + languageName + "]";
    }
 
    private void BindToCheckBox(CheckBox checkBox, IOption2 option, string languageName = null)
    {
        if (languageName == null)
        {
            BindToOption(checkBox, (Option2<bool>)option);
            return;
        }
 
        BindToOption(checkBox, (PerLanguageOption2<bool>)option, languageName);
    }
 
    private void BindToTextBox(TextBox textBox, IOption2 option, string languageName = null)
    {
        if (languageName == null)
        {
            BindToOption(textBox, (Option2<int>)option);
            return;
        }
 
        BindToOption(textBox, (PerLanguageOption2<int>)option, languageName);
    }
}