main.cpp

/////////////////////////////////
// DO NOT MODIFY THIS FILE!!!! //
/////////////////////////////////
#include <fstream>
#include <iostream>
#include <string>
#include <cassert>
#include "Chess.h"

void show_commands( void )
{
	std::cout << "List of commands:" << std::endl;
	std::cout << "\t'?':            show this list of options" << std::endl;
	std::cout << "\t'Q':            quit the game" << std::endl;
	std::cout << "\t'L' <filename>: load a game from the specified file" << std::endl;
	std::cout << "\t                <filename> is the name of the file to read from" <<std::endl;
	std::cout << "\t'S' <filename>: save a game to the specified file" << std::endl;
	std::cout << "\t                <filename> is the name of the file to write to" <<std::endl;
	std::cout << "\t'M' <move>:     try to make the specified move" << std::endl;
	std::cout << "\t                <move> is a four character string giving the" << std::endl;
	std::cout << "\t                column (['A'-'H']), row ('1'-'8') of the start position" << std::endl;
	std::cout << "\t                followed by the column and row of the end position" << std::endl;
}

int main( int argc , char* argv[] )
{
	Chess chess;

	// Display command options
	show_commands();

	bool game_over = false;
	// Keep playing until the game is over
	while( !game_over )
	{
		// Display the board
		chess.board().display();

		// Indicate whose turn it is
		if( chess.turn_white() ) std::cout << "White's move" << std::endl;
		else                     std::cout << "Black's move" << std::endl;

		// If the board is in a check-mate state, end the game
		if( chess.in_mate( chess.turn_white() ) ) 
		{
			std::cout << "Checkmate. Game over" << std::endl;
			game_over = true;
			break;
		}
		// If the board is in a check state, notify the players
		else if( chess.in_check( chess.turn_white() ) ) std::cout << "You are in check!" << std::endl;
		// If the board is in a stalemate state, notify the players
		else if( chess.in_stalemate( chess.turn_white() ) )
		{
			std::cout << "Stalemate. Game over" << std::endl;
			game_over = true;
			break;
		}

		// Get the next command
		std::string choice;
		std::pair< char , char > start , end;
		std::cout << "Next command: ";
		std::cin >> choice;

		// Validate that the command is a single character
		if( choice.length()!=1 )
			std::cerr << "Action specifier must be a single character, length( " << choice << " ) = " << choice.length() << std::endl;
		else
		{
			// Process the different commands
			switch( choice[0] )
			{
			case '?':
				// Show the commands
				show_commands();
				break;
			case 'Q': case 'q':
				// Quit the game
				game_over = true;
				break;
			case 'L': case 'l':
			{
				// Load a game from a file
				std::string argument;
				std::cin >> argument;
				std::ifstream ifs;
				ifs.open( argument );
				ifs >> chess;
				ifs.close();
				// Check that the game is valid
				assert( chess.board().has_valid_kings() );
				break;
			}
			case 'S': case 's':
			{
				// Write a game to a file
				std::string argument;
				std::cin >> argument;
				std::ofstream ofs;
				ofs.open( argument );
				ofs << chess;
				ofs.close();
				break;
			}
			case 'M': case 'm':
			{
				// Make a move
				std::string argument;
				std::cin >> argument;
				// Validate that the move is correctly specified
				if( argument.length()!=4 )
					std::cerr << "Move specifier must be four characters, length( " << argument << " ) = " << argument.length() << std::endl;
				// And make the move
				else
					chess.make_move( std::make_pair( argument[0] , argument[1] ) , std::make_pair( argument[2] , argument[3] ) );
				break;
			}
			default:
				// Unrecognized command
				std::cerr << "Invalid action '" << choice << "'" << std::endl;
			}
		}
	}

	// Write out the state of the game to a file
	if( argc>1 )
	{
		std::ofstream ofs;
		ofs.open( argv[1] );
		ofs << chess;
		ofs.close();
	}

	return 0;
}