using System.Linq;
using System.Numerics;
using Content.Client.UserInterface.Controls;
using Content.Shared._DV.QuickPhrase;
using Robust.Client.AutoGenerated;
using Robust.Client.UserInterface;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.Prototypes;

namespace Content.Client._DV.AACTablet.UI;

[GenerateTypedNameReferences]
public sealed partial class AACWindow : FancyWindow
{
    [Dependency] private readonly IPrototypeManager _prototype = default!;
    private readonly List<QuickPhrasePrototype> _phrases;
    private readonly Dictionary<string, List<QuickPhrasePrototype>> _filteredPhrases = new();
    public event Action<List<ProtoId<QuickPhrasePrototype>>>? PhraseButtonPressed;
    public event Action? Typing;
    public event Action? SubmitPressed;

    private const float SpaceWidth = 10f;
    private const float ParentWidth = 540f;
    private const int ColumnCount = 4;

    private const int ButtonWidth =
        (int)((ParentWidth - SpaceWidth * 2) / ColumnCount - SpaceWidth * ((ColumnCount - 1f) / ColumnCount));

    public const int MaxPhrases = 10; // no writing novels

    private readonly List<ProtoId<QuickPhrasePrototype>> _phraseBuffer = [];
    private readonly List<ProtoId<QuickPhrasePrototype>> _phraseSingle = [];

    public AACWindow()
    {
        RobustXamlLoader.Load(this);
        IoCManager.InjectDependencies(this);

        _phrases = _prototype.EnumeratePrototypes<QuickPhrasePrototype>().ToList();
        _phrases.Sort((a, b) => string.CompareOrdinal(a.Group, b.Group));
        SearchBar.OnTextChanged += FilterSearch;
        SendButton.OnPressed += SendBuffer;
        ClearButton.OnPressed += BackspaceBuffer;
        PopulateGui();
        FilterSearch(null);
    }

    private void BackspaceBuffer(BaseButton.ButtonEventArgs obj)
    {
        if (_phraseBuffer.Count == 0)
            return;

        _phraseBuffer.RemoveAt(_phraseBuffer.Count - 1);
        UpdateBufferText();
        Typing?.Invoke();
    }

    private void UpdateBufferText()
    {
        BufferedString.Text = string.Empty;
        foreach (var phraseId in _phraseBuffer)
        {
            var phrase = _prototype.Index(phraseId);
            BufferedString.Text += Loc.GetString(phrase.Text) + " ";
        }
    }

    private void SendBuffer(BaseButton.ButtonEventArgs obj)
    {
        PhraseButtonPressed?.Invoke(_phraseBuffer);
        _phraseBuffer.Clear();
        BufferedString.Text = string.Empty;
        SubmitPressed?.Invoke();
    }

    private void FilterSearch(LineEdit.LineEditEventArgs? obj)
    {
        SearchResults.DisposeAllChildren();
        _filteredPhrases.Clear();

        var emptySearch = string.IsNullOrEmpty(SearchBar.Text);
        foreach (var phrase in _phrases)
        {
            if (!emptySearch && !Loc.GetString(phrase.Text).Contains(SearchBar.Text, StringComparison.CurrentCultureIgnoreCase))
            {
                continue;
            }

            if (_filteredPhrases.TryGetValue(phrase.Group, out var group))
            {
                group.Add(phrase);
            }
            else
            {
                _filteredPhrases.Add(phrase.Group, new List<QuickPhrasePrototype> { phrase });
            }
        }

        foreach (var phraseList in _filteredPhrases.Values)
        {
            phraseList.Sort((a, b) =>
                string.Compare(Loc.GetString(a.Text),
                    Loc.GetString(b.Text),
                    StringComparison.CurrentCultureIgnoreCase));
        }

        var boxContainer = CreateBoxContainerForTab(_filteredPhrases);
        SearchResults.AddChild(boxContainer);
    }

    private void PopulateGui()
    {
        // take ALL phrases and turn them into tabs and groups, so the buttons are sorted and tabbed
        var sortedTabs = _phrases
            .GroupBy(p => p.Tab)
            .OrderBy(g => g.Key)
            .ToDictionary(
                g => g.Key,
                g => g.GroupBy(p => p.Group)
                    .OrderBy(gg => gg.Key)
                    .ToDictionary(
                        gg => gg.Key,
                        gg => gg.OrderBy(p => Loc.GetString(p.Text)).ToList()
                    )
            );

        CreateTabContainer(sortedTabs);
    }

    private void CreateTabContainer(Dictionary<string, Dictionary<string, List<QuickPhrasePrototype>>> sortedTabs)
    {
        foreach (var tab in sortedTabs)
        {
            var tabName = Loc.GetString(tab.Key);
            var boxContainer = CreateBoxContainerForTab(tab.Value);
            var scroll = new ScrollContainer();
            scroll.HScrollEnabled = false;
            scroll.AddChild(boxContainer);
            WindowBody.AddChild(scroll);
            WindowBody.SetTabTitle(WindowBody.ChildCount - 1, tabName);
        }
    }

    private BoxContainer CreateBoxContainerForTab(Dictionary<string, List<QuickPhrasePrototype>> groups)
    {
        var boxContainer = new BoxContainer
        {
            HorizontalExpand = true,
            Orientation = BoxContainer.LayoutOrientation.Vertical
        };

        foreach (var group in groups)
        {
            var header = CreateHeaderForGroup(group.Key);
            var buttonContainer = CreateButtonContainerForGroup(group.Value);
            boxContainer.AddChild(header);
            boxContainer.AddChild(buttonContainer);
        }

        return boxContainer;
    }

    private static Label CreateHeaderForGroup(string groupName)
    {
        var header = new Label
        {
            HorizontalExpand = true,
            Text = groupName,
            Margin = new Thickness(10, 10, 10, 0),
            StyleClasses = { "LabelBig" }
        };

        return header;
    }

    private GridContainer CreateButtonContainerForGroup(List<QuickPhrasePrototype> phrases)
    {
        var buttonContainer = CreateButtonContainer();
        foreach (var phrase in phrases)
        {
            var text = Loc.GetString(phrase.Text);
            var button = CreatePhraseButton(text, phrase.StyleClass);
            button.OnPressed += _ => OnPhraseButtonPressed(new ProtoId<QuickPhrasePrototype>(phrase.ID));
            buttonContainer.AddChild(button);
        }
        return buttonContainer;
    }

    private static GridContainer CreateButtonContainer()
    {
        var buttonContainer = new GridContainer
        {
            Margin = new Thickness(10),
            Columns = ColumnCount
        };

        return buttonContainer;
    }

    private static Button CreatePhraseButton(string text, string styleClass)
    {
        var phraseButton = new Button
        {
            Access = AccessLevel.Public,
            MaxSize = new Vector2(ButtonWidth, ButtonWidth),
            ClipText = false,
            HorizontalExpand = true,
            StyleClasses = { styleClass }
        };

        var buttonLabel = new RichTextLabel
        {
            Margin = new Thickness(0, 5),
            StyleClasses = { "WhiteText" }
        };

        buttonLabel.SetMessage(text);
        phraseButton.AddChild(buttonLabel);
        return phraseButton;
    }

    private void OnPhraseButtonPressed(ProtoId<QuickPhrasePrototype> phraseId)
    {
        if (ShouldBuffer.Pressed)
        {
            // there's no user feedback but you shouldn't be writing novels anyway
            if (_phraseBuffer.Count >= MaxPhrases)
                return;

            _phraseBuffer.Add(phraseId);
            UpdateBufferText();
            Typing?.Invoke();
        }
        else
        {
            _phraseSingle.Clear();
            _phraseSingle.Add(phraseId);
            PhraseButtonPressed?.Invoke(_phraseSingle);
            SubmitPressed?.Invoke();
        }
    }
}