using CoopSweeper.GameTypes;
using System;
using System.Collections.Generic;
using System.Text;

namespace CoopSweeper.View
{
    public class GameView : IView
    {
        private readonly Game _game;
        private IField[,] _currentMap = null;

        public GameView(Game game)
        {
            _game = game;
        }

        public Position Position { get; set; }

        public Position Cursor { get; set; }

        public Position MapPositon
        {
            get => new Position(Position.X + 1, Position.Y + 1);
            set => Position = new Position(value.X - 1, value.Y - 1);
        }

        public void Draw(bool fullRedraw)
        {
            if (fullRedraw)
                DrawBorder();
            DrawMap(fullRedraw);
        }

        private void DrawMap(bool fullRedraw)
        {
            for (var y = 0; y < _game.Map.GetLength(1); y++)
            {
                if (_currentMap == null || fullRedraw) Console.SetCursorPosition(MapPositon.X, MapPositon.Y + y);
                for (var x = 0; x < _game.Map.GetLength(0); x++)
                {
                    if (_currentMap != null && !fullRedraw)
                    {
                        var currentField = _currentMap[x, y];
                        var newField = _game.Map[x, y];
                        if (currentField == null || currentField.DisplayState != newField.DisplayState)
                        {
                            Console.SetCursorPosition(MapPositon.X + x, MapPositon.Y + y);
                            DrawChar(_game.Map[x, y], x == Cursor.X && y == Cursor.Y);
                        }
                    }
                    else
                    {
                        DrawChar(_game.Map[x, y], x == Cursor.X && y == Cursor.Y);
                    }
                }
            }
            _currentMap = ArrayHelpers.Clone2D(_game.Map);
        }

        private void DrawChar(IField f, bool isCursor)
        {
            var oldBg = Console.BackgroundColor;
            var oldFg = Console.ForegroundColor;
            bool fgChanged = false;
            bool bgChanged = false;
            var c = 'E';
            var state = f.DisplayState;
            switch (state)
            {
                case DisplayState.EMPTY:
                    c = ' ';
                    break;
                case DisplayState.NONE:
                    bgChanged = true;
                    fgChanged = true;
                    Console.ForegroundColor = ConsoleColor.Black;
                    Console.BackgroundColor = ConsoleColor.Gray;
                    //c = '◌';
                    c = ' ';
                    break;
                case DisplayState.QUESTIONMARK:
                    fgChanged = true;
                    bgChanged = true;
                    Console.BackgroundColor = ConsoleColor.Gray;
                    Console.ForegroundColor = ConsoleColor.DarkBlue;
                    c = '?';
                    break;
                case DisplayState.BOMB:
                    fgChanged = true;
                    Console.ForegroundColor = ConsoleColor.Red;
                    c = '☼';
                    break;
                case DisplayState.ERROR:
                    c = 'e';
                    break;
                case DisplayState.FLAG:
                    fgChanged = true;
                    bgChanged = true;
                    Console.BackgroundColor = ConsoleColor.Gray;
                    Console.ForegroundColor = ConsoleColor.DarkRed;
                    c = 'F';
                    break;
                case DisplayState.NUMBER1:
                case DisplayState.NUMBER2:
                case DisplayState.NUMBER3:
                case DisplayState.NUMBER4:
                case DisplayState.NUMBER5:
                case DisplayState.NUMBER6:
                case DisplayState.NUMBER7:
                case DisplayState.NUMBER8:
                    fgChanged = true;
                    switch (state)
                    {
                        case DisplayState.NUMBER1:
                            Console.ForegroundColor = ConsoleColor.Green;
                            break;
                        case DisplayState.NUMBER2:
                            Console.ForegroundColor = ConsoleColor.Yellow;
                            break;
                        case DisplayState.NUMBER3:
                            Console.ForegroundColor = ConsoleColor.DarkYellow;
                            break;
                        case DisplayState.NUMBER4:
                            Console.ForegroundColor = ConsoleColor.DarkRed;
                            break;
                        default:
                            Console.ForegroundColor = ConsoleColor.Red;
                            break;
                    }
                    c = ((int)state).ToString()[0];
                    break;
            }
            if (isCursor)
            {
                fgChanged = true;
                bgChanged = true;
                var s = Console.ForegroundColor;
                Console.ForegroundColor = Console.BackgroundColor;
                Console.BackgroundColor = s;
            }
            Console.Write(c);
            if (fgChanged)
                Console.ForegroundColor = oldFg;
            if (bgChanged)
                Console.BackgroundColor = oldBg;
        }
        private void DrawBorder()
        {
            var width = _game.Map.GetLength(0) + 2;
            var height = _game.Map.GetLength(1) + 2;
            Console.SetCursorPosition(Position.X, Position.Y);
            var linebuilder = new StringBuilder();
            linebuilder.Append("╔");
            for (var x = 0; x < width - 2; x++)
                linebuilder.Append("═");
            linebuilder.Append("╗");
            Console.Write(linebuilder);
            for (var y = 1; y < height - 1; y++)
            {
                Console.SetCursorPosition(Position.X, Position.Y + y);
                Console.Write("║");
                Console.SetCursorPosition(Position.X + width - 1, Position.Y + y);
                Console.Write("║");
            }
            Console.SetCursorPosition(Position.X, Position.Y + height - 1);
            linebuilder = new StringBuilder();
            linebuilder.Append("╚");
            for (var x = 0; x < width - 2; x++)
                linebuilder.Append("═");
            linebuilder.Append("╝");
            Console.Write(linebuilder);
            // ┌──┬──┐  ╔══╦══╗ ╒══╤══╕ ╓──╥──╖
            // │  │  │  ║  ║  ║ │  │  │ ║  ║  ║
            // ├──┼──┤  ╠══╬══╣ ╞══╪══╡ ╟──╫──╢
            // │  │  │  ║  ║  ║ │  │  │ ║  ║  ║
            // └──┴──┘  ╚══╩══╝ ╘══╧══╛ ╙──╨──╜
        }

        public bool HandleKeyEvent(ConsoleKey key)
        {
            var oldCursorPos = Cursor;
            bool fullRedraw = false;
            bool keyHandled = true;
            switch (key)
            {
                case ConsoleKey.UpArrow:
                    Cursor = new Position(Cursor.X, Math.Max(Cursor.Y - 1, 0));
                    break;
                case ConsoleKey.DownArrow:
                    Cursor = new Position(Cursor.X, Math.Min(Cursor.Y + 1, _game.Map.GetLength(1) - 1));
                    break;
                case ConsoleKey.LeftArrow:
                    Cursor = new Position(Math.Max(Cursor.X - 1, 0), Cursor.Y);
                    break;
                case ConsoleKey.RightArrow:
                    Cursor = new Position(Math.Min(Cursor.X + 1, _game.Map.GetLength(0) - 1), Cursor.Y);
                    break;
                case ConsoleKey.Spacebar:
                    fullRedraw = true;
                    _game.Reveal(Cursor.X, Cursor.Y);
                    break;
                case ConsoleKey.F:
                    fullRedraw = true;
                    _game.ToggleMark(Cursor.X, Cursor.Y);
                    break;
                default:
                    keyHandled = false;
                    break;
            }
            if (fullRedraw)
            {
                DrawMap(false);
            }
            else if (oldCursorPos != Cursor)
            {
                Console.SetCursorPosition(oldCursorPos.X + MapPositon.X, oldCursorPos.Y + MapPositon.Y);
                DrawChar(_game.Map[oldCursorPos.X, oldCursorPos.Y], false);
                Console.SetCursorPosition(Cursor.X + MapPositon.X, Cursor.Y + MapPositon.Y);
                DrawChar(_game.Map[Cursor.X, Cursor.Y], true);
            }
            return keyHandled;
        }
    }
}