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;

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

		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
			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 (var mapping in consoleKeyMappings)
			{
				if (inputTextLower.Length > 0)
				{
					if ((mapping.Key == KeyboardKeys.Backslash || mapping.Key == KeyboardKeys.BackQuote) &&
					    (inputTextLower.Contains('ö') ||
					     inputTextLower.Contains('æ') ||
					     inputTextLower.Contains('ø')))
					{
						continue; // Scandinavian keyboard layouts
					}
					else if (mapping.Key == KeyboardKeys.BackQuote && inputTextLower.Contains('\''))
						continue;
					else 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);
		}

		private int inputHistoryIndex = -1;
		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, true);
					inputHistoryIndex = -1;
				}
				finally
				{
					Clear();
				}

				contentBox.ScrollOffset = 0;
				return true;
			}
			else if (key == KeyboardKeys.ArrowUp)
			{
				inputHistoryIndex++;

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

				SetText(line);
				SetSelection(TextLength);
				return true;
			}
			else if (key == KeyboardKeys.ArrowDown)
			{
				if (inputHistoryIndex > 0)
					inputHistoryIndex--;

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

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