/*
   A simple, command-line version of life, using the life board
   defined in LifeBoard.h.  User can give single-letter commands
   to eXit, compute the Next generation, Fill the board randomly
   at 50% density, Read the board from a file, or Write the 
   board to a file.  The board is displayed after any operation
   that changes it.  When the program starts, the board is filled
   with some simple demo patterns.
*/


#include "LifeBoard.h"
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <string>


/* Neatly print a LifeBoard to standard output.
 * Note:  this is assuming that the board is 75-by-25,
 * which is really not very good programming practice.
 */
void printBoard(LifeBoard &life) {
   cout.put('+');
   for (int i = 1; i <= 75; i++)
      cout.put('-');
   cout.put('+');
   cout.put('\n');
   for (int r = 1; r <= 25; r++) {
      cout.put('|');
      for (int c = 1; c <= 75; c++)
         cout.put( life.get(r,c)? '*' : ' ' );
      cout.put('|');
      cout.put('\n');
   }
   cout.put('+');
   for (int i = 1; i <= 75; i++)
      cout.put('-');
   cout.put('+');
   cout.put('\n');
}


/* Add a few living cells to the board, to set up
 * a simple initial configuration for this program.
 */
void makeInitialBoard(LifeBoard &board) {

   board.set(5,5,true);  // Three-cell blinker
   board.set(5,6,true);
   board.set(5,7,true);

   board.set(15,7,true);  // Glider
   board.set(15,8,true);
   board.set(15,9,true);
   board.set(16,9,true);
   board.set(17,8,true);
   
   board.set(5,30,true);  // Static block
   board.set(5,31,true);
   board.set(6,30,true);
   board.set(6,31,true);
   
   board.set(12,50,true);  // Evolves to period-three blinker
   board.set(12,51,true);
   board.set(12,52,true);
   board.set(12,53,true);
   board.set(12,54,true);
   board.set(12,56,true);
   board.set(12,57,true);
   board.set(12,58,true);
   board.set(12,59,true);
   board.set(12,60,true);
}


int main() {

   LifeBoard board;  // The board used for the game.
   
   makeInitialBoard(board);
   
   srand(time(0));  // Initialize random number generator.
   
   cout << "\n\n";
   printBoard(board);
   
   while (true) {
      char ch;  // Command read from user.
      cout << "\n\nX = Exit; N = NextGen; F = Fill; R = Read; W = Write:  ";
      cin >> ch;
      cin.ignore(10000,'\n');
      if (ch == 'X' || ch == 'x')           // Exit.
         break;
      else if (ch == 'N' || ch == 'n')      // Compute next generation.
         board.nextGeneration();
      else if (ch == 'F' || ch == 'f')      // Randomly fill board.
         board.randomFill(0.5);
      else if (ch == 'R' || ch == 'r') {    // Read from file.
         string fileName;
         ifstream file;
         cout << "Input file name:  ";
         cin >> fileName;
         cin.ignore(10000,'\n');
         file.open(fileName.c_str());
         if (!file) {
            cout << "\n*** Error:  Can't open file.\n\n";
            continue;
         }
         bool test = board.readFromStream(file);
         if (!test) {
            cout << "\n*** Error while trying to read from file.\n\n";
            continue;
         }
      }
      else if (ch == 'W' || ch == 'w') {    // Write to file.
         string fileName;
         ofstream file;
         cout << "Output file name:  ";
         cin >> fileName;
         cin.ignore(10000,'\n');
         file.open(fileName.c_str());
         if (!file) {
            cout << "\n*** Error:  Can't open file.\n\n";
            continue;
         }
         bool test = board.writeToStream(file);
         if (!test) {
            cout << "\n*** Error while trying to write to file.\n\n";
            continue;
         }
      }
      else {
         cout << "\nIllegal command; please try again.\n";
         continue;
      }
      cout << "\n\n";
      printBoard(board);
   }
}