using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Battleships
{
    class Program
    {
        static int[,] GenerateGrid(int[,] grid, int numShips, int GRID_SIZE)
        {
            Random rnd = new Random();
            for (int i = 0; i < numShips; i++)
            {
                int x = rnd.Next(0, GRID_SIZE - 1);
                int y = rnd.Next(0, GRID_SIZE - 1);
                grid[x, y] = grid[x, y] != 1 ? 1 : 2;
            }
            return (grid);
        }

        static void PrintGrid(int[,] grid)
        {
            int xLen = grid.GetLength(0);
            int yLen = grid.GetLength(1);
            for (int i = 0; i < xLen; i++, Console.Write(Environment.NewLine ))
            {
                for (int j = 0; j < yLen; Console.Write(string.Format("{0}", grid[i, j])), j++) { }
            }
        }

        static int[,] CheckIfInGrid(int x, int y, int[,] grid, int[,] playerGrid)
        {
            if (x < grid.GetLength(0) && y < grid.GetLength(1)) { playerGrid[x, y] = grid[x, y] == 1 ? 1 : 2; }
            else { Console.WriteLine("Invalid Location"); }
            return (playerGrid);
        }


        static bool CompareGrids(int[,] grid, int[,] playerGrid, int numShips)
        {
            int shipsFound = 0;
            int xLen = grid.GetLength(0);
            int yLen = grid.GetLength(1);
            for (int i = 0; i < xLen; i++)
            {
                for (int j = 0; j < yLen; j++)
                {
                    if (grid[i,j] == 1 && playerGrid[i,j] == 1) { shipsFound++; }
                }
            }
            return (shipsFound == numShips ? true : false);
        }

        static void Main(string[] args)
        {
            const int NUM_SHIPS = 3;
            const int GRID_SIZE = 3;
            int[,] grid = GenerateGrid(new int[GRID_SIZE,GRID_SIZE], NUM_SHIPS, GRID_SIZE);
            int[,] playerGrid = new int[GRID_SIZE,GRID_SIZE];
            bool running = true;
            while (running)
            {
                int x, y;
                PrintGrid(playerGrid);
                Console.Write("Enter Coordinates to test (coordinates start at zero)\nX : ");
                string inputX = Console.ReadLine();
                bool resultX = Int32.TryParse(inputX, out x);
                Console.Write("\nY: ");
                string inputY = Console.ReadLine();
                bool resultY = Int32.TryParse(inputY, out y);
                if ((resultX) && (resultY)) { CheckIfInGrid(x, y, grid, playerGrid); }
                else { Console.WriteLine("Error: Invalid Coordinate entered"); }
                Console.WriteLine();

                if (CompareGrids(grid, playerGrid, NUM_SHIPS))
                {
                    Console.WriteLine("You won, congratulations!!");
                    running = false;
                }
            }
            Console.ReadLine();
        }
    }
}