using CoopSweeper.GameTypes;
using System;
using System.Text;
using System.Threading;

namespace CoopSweeper
{
    class Program
    {
        static IField[,] currentMap = null;
        const int MAP_POS_X = 3;
        const int MAP_POS_Y = 3;

        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;
            Console.ForegroundColor = ConsoleColor.White;
            Console.BackgroundColor = ConsoleColor.Black;
            Console.Clear();
            var game = new Game();
            var cursorPosX = 0;
            var cursorPosY = 0;
            StartNewGame(game, cursorPosX, cursorPosY);
            game.GameFinished += won =>
            {
                Console.SetCursorPosition(0, 0);
                if (won)
                    Console.Write("You won!");
                else
                    Console.Write("You lost!");
                DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY, true);
                Console.ReadKey();
                StartNewGame(game, cursorPosX, cursorPosY);
            };
            ConsoleKey key = (ConsoleKey)(-1);
            while ((key = Console.ReadKey().Key) != ConsoleKey.Escape)
            {
                var oldCursorPosX = cursorPosX;
                var oldCursorPosY = cursorPosY;
                bool fullRedraw = false;
                switch(key)
                {
                    case ConsoleKey.UpArrow:
                        cursorPosY--; break;
                    case ConsoleKey.DownArrow:
                        cursorPosY++; break;
                    case ConsoleKey.LeftArrow:
                        cursorPosX--; break;
                    case ConsoleKey.RightArrow:
                        cursorPosX++; break;
                    case ConsoleKey.Spacebar:
                        fullRedraw = true;
                        game.Reveal(cursorPosX, cursorPosY); break;
                    case ConsoleKey.F:
                        fullRedraw = true;
                        game.ToggleMark(cursorPosX, cursorPosY); break;
                }
                if (cursorPosX < 0) cursorPosX = 0;
                if (cursorPosY < 0) cursorPosY = 0;
                if (cursorPosX >= game.Map.GetLength(0)) cursorPosX = game.Map.GetLength(0) - 1;
                if (cursorPosY >= game.Map.GetLength(1)) cursorPosY = game.Map.GetLength(1) - 1;
                if (fullRedraw)
                    DrawMap(3, 3, game.Map, cursorPosX, cursorPosY, true);
                else if(oldCursorPosX != cursorPosX || oldCursorPosY != cursorPosY)
                {
                    Console.SetCursorPosition(oldCursorPosX + 3, oldCursorPosY + 3);
                    DrawChar(game.Map[oldCursorPosX, oldCursorPosY], false);
                    Console.SetCursorPosition(cursorPosX + 3, cursorPosY + 3);
                    DrawChar(game.Map[cursorPosX, cursorPosY], true);
                }
                Console.SetCursorPosition(0, 0);
                Console.CursorVisible = false;
            } 
        }

        private static 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;
        }

        public static void StartNewGame(Game game, int cursorPosX, int cursorPosY)
        {
            game.GenerateGame(100, 30, 15);
            Console.Clear();
            Console.SetCursorPosition(0, 0);
            DrawBorder(MAP_POS_X - 1, MAP_POS_X - 1, game.Map.GetLength(0) + 2, game.Map.GetLength(1) + 2);
            DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY, false);
        }

        private static void DrawMap(int posX, int posY, IField[,] map, int cursorX, int cursorY, bool doChangeDetection)
        {
            for (var y = 0; y < map.GetLength(1); y++)
            {
                if(currentMap == null || !doChangeDetection) Console.SetCursorPosition(posX, posY + y);
                for (var x = 0; x < map.GetLength(0); x++)
                {
                    if (currentMap != null && doChangeDetection)
                    {
                        var currentField = currentMap[x, y];
                        var newField = map[x, y];
                        if (currentField == null || currentField.DisplayState != newField.DisplayState)
                        {
                            Console.SetCursorPosition(posX + x, posY + y);
                            DrawChar(map[x, y], x == cursorX && y == cursorY);
                        }
                    }
                    else
                    {
                        DrawChar(map[x, y], x == cursorX && y == cursorY);
                    }
                }
            }
            currentMap = ArrayHelpers.Clone2D(map);
        }

        private static void DrawBorder(int posX, int posY, int width, int height)
        {
            Console.SetCursorPosition(posX, posY);
            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(posX, posY + y);
                Console.Write("║");
                Console.SetCursorPosition(posX + width - 1, posY + y);
                Console.Write("║");
            }
            Console.SetCursorPosition(posX, posY + height - 1);
            linebuilder = new StringBuilder();
            linebuilder.Append("╚");
            for (var x = 0; x < width - 2; x++)
                linebuilder.Append("═");
            linebuilder.Append("╝");
            Console.Write(linebuilder);
            // ┌──┬──┐  ╔══╦══╗ ╒══╤══╕ ╓──╥──╖
            // │  │  │  ║  ║  ║ │  │  │ ║  ║  ║
            // ├──┼──┤  ╠══╬══╣ ╞══╪══╡ ╟──╫──╢
            // │  │  │  ║  ║  ║ │  │  │ ║  ║  ║
            // └──┴──┘  ╚══╩══╝ ╘══╧══╛ ╙──╨──╜
        }
    }
}