<?php
/**
 * Manages miners guild.
 *
 * @package inc\guild.inc
 * @author     Alexandre Renoux
 * @author     Pierre-Emmanuel Novac
 */

/**
 * Amount of gold required to build the miners guild.
 */
define("GUILD_COST",10);
/**
 * Amount of gold required to hire a miner.
 */
define("MINER_COST",5);

function initMinersIfNeeded() {
	if(empty($_SESSION["mine"]))
		$_SESSION["mine"] = array("miners" => 0);
	else if(!array_key_exists("miners", $_SESSION["mine"]))
		$_SESSION["mine"]["miners"] = 0;
}

/**
 * Create the miners guild in the session.
 * Debits GUILD_COST from the player's gold.
 *
 * @return void
 */
function createGuild(){
	if(!empty($_SESSION["guild"])) {
		sendError("guild_already_built");
	}
	elseif(debitAccount(GUILD_COST)) {
		$_SESSION["guild"] = true;
		echo json_encode(array("cost" => GUILD_COST));
	}
}

/**
 * Hire one miner.
 * Debits MINER_COST from the player's gold.
 *
 * @return void
 */
function hireMiner(){
	if(!isset($_SESSION["guild"])){
		sendError("guild_not_yet_created");
	}
	elseif(debitAccount(MINER_COST)){
		initMinersIfNeeded();
		$_SESSION["mine"]["miners"]++;
		echo json_encode(array("cost" => MINER_COST , "miners" => $_SESSION["mine"]["miners"]));	
	}
}

/**
 * Returns the number of miners currently in the guild.
 *
 * @return int  number of miners in the guild
 */
function sendMiners(){
	initMinersIfNeeded();
	return $_SESSION["mine"]["miners"];
}
	

?>