using System.Collections.Generic;
using System.Linq;
using FlaxEngine;

namespace Game;

public class ConsoleInputTextBox : ConsoleTextBoxBase
{
    private readonly ConsoleContentTextBox contentBox;

    private int inputHistoryIndex = -1;

    public ConsoleInputTextBox()
    {
    }

    public ConsoleInputTextBox(ConsoleContentTextBox contentBox, float x, float y, float width, float height)
        : base(x, y, width, height)
    {
        this.contentBox = contentBox;
        IsMultiline = true; // Not really but behaves better than single-line box
    }

    public override string TextPrefix => Console.LinePrefix;

    protected override Rectangle TextRectangle => new Rectangle(0, 0, Width, Height);
    protected override Rectangle TextClipRectangle => new Rectangle(0, 0, Width, Height);

    private bool IsConsoleKeyPressed(KeyboardKeys key = KeyboardKeys.None)
    {
        // Ignore any characters generated by the key which opens the console
        string inputTextLower = Input.InputText.ToLowerInvariant();

        IEnumerable<ActionConfig> consoleKeyMappings;
        if (key == KeyboardKeys.None)
            consoleKeyMappings = Input.ActionMappings.Where(x => x.Name == "Console" && x.Key != KeyboardKeys.None);
        else
            consoleKeyMappings = Input.ActionMappings.Where(x => x.Name == "Console" && x.Key == key);
        foreach (ActionConfig mapping in consoleKeyMappings)
        {
            if (inputTextLower.Length > 0)
            {
                // TODO: Remove this shit when scancode input is implemented in the engine
                if ((mapping.Key == KeyboardKeys.Backslash || mapping.Key == KeyboardKeys.BackQuote) &&
                    (inputTextLower.Contains('ö') ||
                     inputTextLower.Contains('æ') ||
                     inputTextLower.Contains('ø')))
                    continue; // Scandinavian keyboard layouts
                if (mapping.Key == KeyboardKeys.BackQuote && inputTextLower.Contains('\''))
                    continue;
                if (mapping.Key == KeyboardKeys.Backslash &&
                    (inputTextLower.Contains('\\') || inputTextLower.Contains('|')))
                    continue;
            }

            if (Input.GetKey(mapping.Key))
                return true;
        }

        return false;
    }

    public override bool OnCharInput(char c)
    {
        if (IsConsoleKeyPressed())
            return true;

        return base.OnCharInput(c);
    }

    public override bool OnKeyDown(KeyboardKeys key)
    {
        bool shiftDown = Root.GetKey(KeyboardKeys.Shift);
        bool ctrlDown = Root.GetKey(KeyboardKeys.Control);

        if (IsConsoleKeyPressed(key))
        {
            Clear();
            return true;
        }

        if (key == KeyboardKeys.Escape)
        {
            Console.Close();
            Clear();
            return true;
        }

        if (key == KeyboardKeys.Return)
        {
            try
            {
                Console.Execute(Text, true);
                inputHistoryIndex = -1;
            }
            finally
            {
                Clear();
            }

            contentBox.ScrollOffset = 0;
            return true;
        }

        if (key == KeyboardKeys.ArrowUp)
        {
            inputHistoryIndex++;

            string line = Console.GetBufferHistory(inputHistoryIndex);
            if (line == null)
            {
                inputHistoryIndex--;
                return true;
            }

            SetText(line);
            SetSelection(TextLength);
            return true;
        }

        if (key == KeyboardKeys.ArrowDown)
        {
            if (inputHistoryIndex > 0)
                inputHistoryIndex--;

            string line = Console.GetBufferHistory(inputHistoryIndex);
            if (line == null)
                return true;

            SetText(line);
            SetSelection(TextLength);
            return true;
        }

        if (key == KeyboardKeys.PageUp || key == KeyboardKeys.PageDown)
            return contentBox.OnKeyDown(key);

#if FLAX_EDITOR
        if (key == KeyboardKeys.F5)
            return false;
#endif

        return base.OnKeyDown(key);
    }

    public override void OnLostFocus()
    {
        // Prevent caret location getting reset back to beginning,
        // and submitting the value when focus is lost.
        bool oldEditing = _isEditing;
        _isEditing = false;
        try
        {
            base.OnLostFocus();
        }
        finally
        {
            _isEditing = oldEditing;
        }
    }

    public override bool OnMouseDown(Float2 location, MouseButton button)
    {
        base.OnMouseDown(location, button);
        return true;
    }

    public override bool OnMouseWheel(Float2 location, float delta)
    {
        return contentBox.OnMouseWheel(location, delta);
    }

    public override void Draw()
    {
        Profiler.BeginEvent("ConsoleInputTextBoxDraw");
        base.Draw();
        Profiler.EndEvent();
    }
}