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using System;
using System.Threading.Tasks;

namespace Life
{
    public class LifeSimulation
    {
        private bool[,] world;
        private bool[,] nextGeneration;
        private Task processTask;

        public LifeSimulation(int size)
        {
            if (size < 0) throw new ArgumentOutOfRangeException("Size must be greater than zero");
            this.Size = size;
            world = new bool[size, size];
            nextGeneration = new bool[size, size];
        }

        public int Size { get; private set; }
        public int Generation { get; private set; }

        public Action<bool[,]> NextGenerationCompleted;

        public bool this[int x, int y]
        {
            get { return this.world[x, y]; }
            set { this.world[x, y] = value; }
        }

        public bool ToggleCell(int x, int y)
        {
            bool currentValue = this.world[x, y];
            return this.world[x, y] = !currentValue;
        }

        public void Update()
        {
            if (this.processTask != null && this.processTask.IsCompleted)
            {
                // when a generation has completed
                // now flip the back buffer so we can start processing on the next generation
                var flip = this.nextGeneration;
                this.nextGeneration = this.world;
                this.world = flip;
                Generation++;

                // begin the next generation's processing asynchronously
                this.processTask = this.ProcessGeneration();

                if (NextGenerationCompleted != null) NextGenerationCompleted(this.world);
            }
        }

        public void BeginGeneration()
        {
            if (this.processTask == null || (this.processTask != null && this.processTask.IsCompleted))
            {
                // only begin the generation if the previous process was completed
                this.processTask = this.ProcessGeneration();
            }
        }

        public void Wait()
        {
            if (this.processTask != null)
            {
                this.processTask.Wait();
            }
        }

        private Task ProcessGeneration()
        {
            return Task.Factory.StartNew(() =>
            {
                Parallel.For(0, Size, x =>
                {
                    Parallel.For(0, Size, y =>
                    {
                        int numberOfNeighbors = IsNeighborAlive(world, Size, x, y, -1, 0)
                            + IsNeighborAlive(world, Size, x, y, -1, 1)
                            + IsNeighborAlive(world, Size, x, y, 0, 1)
                            + IsNeighborAlive(world, Size, x, y, 1, 1)
                            + IsNeighborAlive(world, Size, x, y, 1, 0)
                            + IsNeighborAlive(world, Size, x, y, 1, -1)
                            + IsNeighborAlive(world, Size, x, y, 0, -1)
                            + IsNeighborAlive(world, Size, x, y, -1, -1);

                        bool shouldLive = false;
                        bool isAlive = world[x, y];

                        if (isAlive && (numberOfNeighbors == 2 || numberOfNeighbors == 3))
                        {
                            shouldLive = true;
                        }
                        else if (!isAlive && numberOfNeighbors == 3) // zombification
                        {
                            shouldLive = true;
                        }

                        nextGeneration[x, y] = shouldLive;

                    });
                });
            });
        }

        private static int IsNeighborAlive(bool[,] world, int size, int x, int y, int offsetx, int offsety)
        {
            int result = 0;

            int proposedOffsetX = x + offsetx;
            int proposedOffsetY = y + offsety;
            bool outOfBounds = proposedOffsetX < 0 || proposedOffsetX >= size | proposedOffsetY < 0 || proposedOffsetY >= size;
            if (!outOfBounds)
            {
                result = world[x + offsetx, y + offsety] ? 1 : 0;
            }
            return result;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            LifeSimulation sim = new LifeSimulation(10);

            // initialize with a blinker
            sim.ToggleCell(5, 5);
            sim.ToggleCell(5, 6);
            sim.ToggleCell(5, 7);

            sim.BeginGeneration();
            sim.Wait();
            OutputBoard(sim);

            sim.Update();
            sim.Wait();
            OutputBoard(sim);

            sim.Update();
            sim.Wait();
            OutputBoard(sim);

            Console.ReadKey();
        }

        private static void OutputBoard(LifeSimulation sim)
        {
            var line = new String('-', sim.Size);
            Console.WriteLine(line);

            for (int y = 0; y < sim.Size; y++)
            {
                for (int x = 0; x < sim.Size; x++)
                {
                    Console.Write(sim[x, y] ? "1" : "0");
                }

                Console.WriteLine();
            }
        }
    }
}                    

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public partial class Form1 : Form
    {
        private TextBox[,] boxArray;

        public Form1()
        {
            InitializeComponent();
            CreateBoxes(5);
        }

        private void CreateBoxes(int size)
        {            
            boxArray = new TextBox[size, size];

            for(int x = 0; x < size; x++)
                for(int y = 0; y < size; y++)
                {
                    boxArray[x, y] = new TextBox();
                    boxArray[x, y].Parent = this;
                    boxArray[x, y].Left = boxArray[x, y].Width * x;
                    boxArray[x, y].Top = boxArray[x, y].Height * y;
                }
        }
    }