/*
 *	Copyright (c) 2010, Bazhukov Georgy aka helios
 *	All rights reserved.
 *
 *	Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 *	 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *	 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *	 * Neither the name of the <ORGANIZATION> nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 *	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *	IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *	LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *	EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *	Global variables
 */
var bombx	= new Array();
var bomby	= new Array();
var visited	= new Array();
var marked	= new Array();

var dead;
var cols;
var rows;
var field;
var bombs;
/*
 *	Start game: flush all variables and build field
 */
function start () {
	dead = false;

	field	= document.getElementById('field');
	cols	= document.getElementById('cols');
	rows	= document.getElementById('rows');
	bombs	= document.getElementById('bombs');
	tmpl	= document.getElementById('tmpl');

	switch (tmpl.value) {
		case '0': break;
		case '1':
			cols.value = 8;
			rows.value = 8;
			bombs.value = 10;
			tmpl.value = 0;
			break;
		case '2':
			cols.value = 16;
			rows.value = 16;
			bombs.value = 40;
			tmpl.value = 0;
			break;
		case '3':
			cols.value = 30;
			rows.value = 16;
			bombs.value = 99;
			tmpl.value = 0;
			break;
	}

document.getElementById('mines').style.height = rows.value * 30 + 100 + 'px';
	
	if ( bombs.value > cols.value * rows.value )
		bombs.value = cols.value * rows.value;
	
	field.innerHTML = "";

	for ( var p = 0; p < bombx.length; ++p ) 
		bombx[p] = bomby[p] = null;
	
	for ( var i = 0; i < rows.value; ++i ) {
		visited[i] = new Array();
		marked[i] = new Array();

		field.innerHTML += "<div>";

var accum = '';

		for ( var j = 0; j < cols.value; ++j ) {
			accum += "<span oncontextmenu='return dont(event)' "
							+ "onmouseup='return action(event,"+ i + "," + j +")'"
							+ "id='" + i + "x" + j + "'>&nbsp;</span>";
			visited[i][j] = false;
			marked[i][j] = false;
		}
		field.innerHTML += accum + "</div>";
	}
/*
 *	Generate bomb's positions
 */
gen:
	for ( i = 0; i < bombs.value; ++i ) {
		var x = Math.floor ( Math.random() * ( cols.value ) );
		var y = Math.floor ( Math.random() * ( rows.value ) );
		
		for ( j = 0; j < i; ++j)
			if ( x == bombx[j] && y == bomby[j] ) {
				--i;
				continue gen
			}
		
		bombx[i] = x;
		bomby[i] = y;
	}
	return true;
}
/*
 *	Click or Mark
 */
function action (event,n,m) {
	var button;
/*
 *	Get button
 */
    if (event.which == null)
		button= (event.button < 2) ? "LEFT" :
			((event.button == 4) ? "MIDDLE" : "RIGHT");
    else
		button= (event.which < 2) ? "LEFT" :
			((event.which == 2) ? "MIDDLE" : "RIGHT");
	
	// field.innerHTML += button;
	
	switch (button) {
		case 'LEFT': click(n,m); break;
		case 'RIGHT': mark(n,m); break;
	}
	
    dont(event);
}
/*
 *	Block event
 */
function dont(event) {
    if (event.preventDefault)
        event.preventDefault();
    else
        event.returnValue= false;
     return false;
}
/*
 *	Click
 */
function click (n,m) {
	// get cell
	var cell = document.getElementById(n + "x" + m);
	
	// Can't click blocked or clicked cells
	if ( visited[n][m] || marked[n][m] ) return true;

	// Well, we click it...
	visited[n][m] = true;

	// Is it bomb?
	for ( var i = 0; i < bombx.length; ++i )
		if ( n == bomby[i] && m == bombx[i] ) {
			cell.style.background = "red";
			if ( ! dead ) click_all(); // Yes, It was a bomb.  ^_^ -> x_x
			return false;
		}

	var bomb_count = 0;

	// Counting bombs in neighbors
	for ( var i = n - 1; i < n + 2; ++i )
		for ( var j = m - 1; j < m + 2; ++j )
			for ( var k = 0; k < bombx.length; ++k )
				if ( i == bomby[k] && j == bombx[k] && j >= 0 && i >=0 ) 
					++bomb_count;
	// Draw it
	cell.style.background = "black";
	cell.innerHTML = bomb_count;
	
	// If no bombs in a region => open this region
	if ( bomb_count == 0 && !dead ) click_null(n,m);
	
	return true;
}
/*
 *	Open Null-Cell's neighbors.
 */
function click_null (x,y) {
	for ( var i = x - 1; i < x + 2; ++i )
		for ( var j = y - 1; j < y + 2; ++j )
			if ( i >= 0 && j >=0 && i < rows.value && j < cols.value )
				click (i,j);
	return true;
}
/*
 *	Well, User is dead. Lets show him field.
 */
function click_all () {
	alert("BOOM!");
	
	dead = true;

	for ( var i = 0; i < rows.value; ++i )
		for ( var j = 0; j < cols.value; ++j )
			click(i,j);
}

function mark (n,m) {
	// get cell
	var cell = document.getElementById(n + "x" + m);
	// unmark
	if ( marked[n][m] ) {
		cell.style.background = 'orange';
		marked[n][m] = false;
	}
	// mark
	else {
		cell.style.background = 'gray';
		marked[n][m] = true;
		
		var count = 0;
		var mcount = 0;
		// is all bombs marked?
		for ( var i = 0; i < bombx.length; ++i )
			if ( marked[ bomby[i] ][ bombx[i] ] ) ++count;
		// is only bombs marked?
		for ( i = 0; i < rows.value; ++i)
			for (var j = 0; j < cols.value; ++j)
				if ( marked[i][j] ) ++mcount;
		if ( count == bombs.value && mcount == count)
			alert('WiN!');
	}
		
	return true;
}