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

namespace Cabrito
{
    public class ConsoleInputTextBox : ConsoleTextBoxBase
    {
        public override string TextPrefix { get => Console.LinePrefix; }

        private ConsoleContentTextBox contentBox;

        public ConsoleInputTextBox() : base()
        {

        }

        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
        }

        private bool IsConsoleKeyPressed(KeyboardKeys key = KeyboardKeys.None)
        {
            // Ignore any characters generated by the key which opens the console
            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 (var mapping in consoleKeyMappings)
            {
                if (Input.InputText.Length > 0)
                {
                    if ((mapping.Key == KeyboardKeys.Backslash || mapping.Key == KeyboardKeys.BackQuote) &&
                        (Input.InputText.ToLowerInvariant().Contains('ö') ||
                        Input.InputText.ToLowerInvariant().Contains('æ') ||
                        Input.InputText.ToLowerInvariant().Contains('ø')))
                    {
                        continue; // Scandinavian keyboards layouts
                    }
                    else if (mapping.Key == KeyboardKeys.BackQuote && Input.InputText.ToLowerInvariant().Contains('\''))
                        continue;
                    else if (mapping.Key == KeyboardKeys.Backslash && (Input.InputText.ToLowerInvariant().Contains('\\') || Input.InputText.ToLowerInvariant().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;
            }
            else if (key == KeyboardKeys.Escape)
            {
                Console.Close();
                Clear();
                return true;
            }
            else if (key == KeyboardKeys.Return)
            {
                try
                {
                    Console.Execute(Text);
                }
                finally
                {
                    Clear();
                }
                return true;
            }
            else if (key == KeyboardKeys.ArrowUp || key == KeyboardKeys.ArrowDown)
            {
                // TODO: implement input history
                return true;
            }
            else if (key == KeyboardKeys.PageUp || key == KeyboardKeys.PageDown)
            {
                return contentBox.OnKeyDown(key);
            }

            return base.OnKeyDown(key);
        }

        public override void OnLostFocus()
        {
            // Avoids reseting the caret location
            var oldEditing = _isEditing;
            _isEditing = false;
            base.OnLostFocus();
            _isEditing = oldEditing;
        }

        public override bool OnMouseDown(Vector2 location, MouseButton button)
        {
            base.OnMouseDown(location, button);
            return true;
        }

        public override bool OnMouseWheel(Vector2 location, float delta)
        {
            return contentBox.OnMouseWheel(location, delta);
        }

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