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using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WordSearch
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }
 
        private void generatePuzzle()
        {
            const int NWORDS = 6;
            const int ROW = 10;
            const int COL = 25;
 
            char [,] grid = new char[COL,ROW];
 
            //Initialize the grid to empty characters
            for (int r = 0; r < COL; r++)
            {
                for (int c = 0; c < ROW; c++)
                {
                    grid[r, c] = ' ';
                }
            }
 
            FileStream file = null;
            try //Make sure that the file exists.
            {
                file = new FileStream("wordbank.txt", FileMode.Open, FileAccess.Read);
            }
            catch (FileNotFoundException)
            {
                MessageBox.Show("Please make sure a wordbank.txt file exists in the same directory as this program!", "Error",
                MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
 
            StreamReader sr = new StreamReader(file);
            List<string> words = new List<string>();
            while (!sr.EndOfStream)
            {
                words.Add(sr.ReadLine());
            }
 
            string wordsToFind="";
 
            Random generator = new Random();
            for (int i = 0; i < NWORDS; i++)
            {
                bool validPosition = false;
                do
                {
                    int index = generator.Next(words.Count);
                    string selWord = words[index];
 
                    int xSel = generator.Next(COL);
                    int ySel = generator.Next(ROW);
                    int dir = generator.Next(2);
 
                    //Try inserting the word into the grid.
                    if (dir == 0) //Vertical
                    {
                        if ((ySel + selWord.Length) < ROW) //Make sure the word fits!
                        {
                            //See if we can fit the word in
                            int cntWordIndex = 0;
                            for (int yIndex = ySel; yIndex < (ySel + selWord.Length); yIndex++)
                            {
                                //Can we place this character in this slot?
                                if (grid[xSel, yIndex] != ' ' && grid[xSel, yIndex] != selWord[cntWordIndex])
                                {
                                    validPosition = false;
                                    break;
                                }
                                else
                                {
                                    validPosition = true;
                                }
                                cntWordIndex++;
                            }
                            if (validPosition)
                            {
                                //Put the word into the grid.
                                cntWordIndex = 0;
                                for (int yIndex = ySel; yIndex < (ySel + selWord.Length); yIndex++)
                                {
                                    grid[xSel, yIndex] = selWord[cntWordIndex];
                                    cntWordIndex++;
                                }
                                wordsToFind += selWord;
                                wordsToFind += "\r\n";
                            }
                        }
                    }
                    else //Horizontal
                    {
                        if ((xSel + selWord.Length) < COL) //Make sure the word fits!
                        {
                            //See if we can fit the word in
                            int cntWordIndex = 0;
                            for (int xIndex = xSel; xIndex < (xSel + selWord.Length); xIndex++)
                            {
                                //Can we place this character in this slot?
                                if (grid[xIndex, ySel] != ' ' && grid[xIndex, ySel] != selWord[cntWordIndex])
                                {
                                    validPosition = false;
                                    break;
                                }
                                else
                                {
                                    validPosition = true;
                                }
                                cntWordIndex++;
                            }
                            if (validPosition)
                            {
                                //Put the word into the grid.
                                cntWordIndex = 0;
                                for (int xIndex = xSel; xIndex < (xSel + selWord.Length); xIndex++)
                                {
                                    grid[xIndex, ySel] = selWord[cntWordIndex];
                                    cntWordIndex++;
                                }
                                wordsToFind += selWord;
                                wordsToFind += "\r\n";
                            }
                        }
                    }
 
                } while (!validPosition);
 
                
            }
 
            //Now fill the rest of the grid with random letters!
            for (int r = 0; r < COL; r++)
            {
                for (int c = 0; c < ROW; c++)
                {
                    if (grid[r, c] == ' ')
                    {
                        grid[r, c] = (char)generator.Next(97, 123);
                    }
                }
            }
 
            string str="";
            for (int r = 0; r < COL; r++)
            {
                for (int c = 0; c < ROW; c++)
                {
                    str += grid[r, c] + "\t";
                }
                str += "\r\n";
            }
 
            txtToFind.Text = wordsToFind;
            txtSearch.Text = str; //All that just to get this line to work :)
        }
 
        private void frmMain_Load(object sender, EventArgs e)
        {
            generatePuzzle();
        }
 
        private void btnGen_Click(object sender, EventArgs e)
        {
            generatePuzzle();
        }
    }
}