<?php
/**
 * @file index.php
 *
 * @brief The main entry point to the application.
 *
 * Bootstrap the application, load configuration, load modules, load theme, etc.
 */

/*
 * bootstrap the application
 */
require_once('boot.php');
// our global App object
$a = new App;

/*
 * Load the configuration file which contains our DB credentials.
 * Ignore errors. If the file doesn't exist or is empty, we are running in
 * installation mode.
 */

$a->install = ((file_exists('.htconfig.php') && filesize('.htconfig.php')) ? false : true);

@include('.htconfig.php');

$a->timezone = ((x($default_timezone)) ? $default_timezone : 'UTC');
date_default_timezone_set($a->timezone);


/*
 * Try to open the database;
 */

require_once('include/dba/dba_driver.php');

if(! $a->install) {
	$db = dba_factory($db_host, $db_port, $db_user, $db_pass, $db_data, $db_type, $a->install);
	if(! $db->connected){
		header('HTTP/1.0 520 Unknown Error');
		// TODO: much friendlier error message
		die("Database error, contact admin.");
	}

	unset($db_host, $db_port, $db_user, $db_pass, $db_data, $db_type);

	/**
	 * Load configs from db. Overwrite configs from .htconfig.php
	 */

	load_config('config');
	load_config('system');
	load_config('feature');

	require_once('include/session.php');
	load_hooks();
	call_hooks('init_1');

	$a->language = get_best_language();
	load_translation_table($a->language);
	// Force the cookie to be secure (https only) if this site is SSL enabled. Must be done before session_start().

	if(intval($a->config['system']['ssl_cookie_protection'])) {
		$arr = session_get_cookie_params();
		session_set_cookie_params(
			((isset($arr['lifetime']))  ? $arr['lifetime'] : 0),
			((isset($arr['path']))      ? $arr['path']     : '/'),
			((isset($arr['domain']))    ? $arr['domain']   : $a->get_hostname()),
			((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
			((isset($arr['httponly']))  ? $arr['httponly'] : true));
	}
}
else {
	// load translations but do not check plugins as we have no database
	$a->language = get_best_language();
	load_translation_table($a->language,true);
}


/**
 *
 * Important stuff we always need to do.
 *
 * The order of these may be important so use caution if you think they're all
 * intertwingled with no logical order and decide to sort it out. Some of the
 * dependencies have changed, but at least at one time in the recent past - the
 * order was critical to everything working properly
 *
 */

session_start();

/**
 * Language was set earlier, but we can over-ride it in the session.
 * We have to do it here because the session was just now opened.
 */

if(array_key_exists('system_language',$_POST)) {
	if(strlen($_POST['system_language']))
		$_SESSION['language'] = $_POST['system_language'];
	else
		unset($_SESSION['language']);
}
if((x($_SESSION, 'language')) && ($_SESSION['language'] !== $lang)) {
	$a->language = $_SESSION['language'];
	load_translation_table($a->language);
}

if((x($_GET,'zid')) && (! $a->install)) {
	$a->query_string = strip_zids($a->query_string);
	if(! local_channel()) {
		$_SESSION['my_address'] = $_GET['zid'];
		zid_init($a);
	}
}

if((x($_SESSION, 'authenticated')) || (x($_POST, 'auth-params')) || ($a->module === 'login'))
	require('include/auth.php');

if(! x($_SESSION, 'sysmsg'))
	$_SESSION['sysmsg'] = array();

if(! x($_SESSION, 'sysmsg_info'))
	$_SESSION['sysmsg_info'] = array();

/*
 * check_config() is responsible for running update scripts. These automatically
 * update the DB schema whenever we push a new one out. It also checks to see if
 * any plugins have been added or removed and reacts accordingly.
 */


if($a->install) {
	/* Allow an exception for the view module so that pcss will be interpreted during installation */
	if($a->module != 'view')
		$a->module = 'setup';
}
else
	check_config($a);

nav_set_selected('nothing');

$arr = array('app_menu' => $a->get_apps());

call_hooks('app_menu', $arr);

$a->set_apps($arr['app_menu']);

/**
 *
 * We have already parsed the server path into $a->argc and $a->argv
 *
 * $a->argv[0] is our module name. We will load the file mod/{$a->argv[0]}.php
 * and use it for handling our URL request.
 * The module file contains a few functions that we call in various circumstances
 * and in the following order:
 *
 * "module"_init
 * "module"_post (only called if there are $_POST variables)
 * "module"_content - the string return of this function contains our page body
 *
 * Modules which emit other serialisations besides HTML (XML,JSON, etc.) should do
 * so within the module init and/or post functions and then invoke killme() to terminate
 * further processing.
 */

if(strlen($a->module)) {

	/**
	 *
	 * We will always have a module name.
	 * First see if we have a plugin which is masquerading as a module.
	 *
	 */

	if(is_array($a->plugins) && in_array($a->module,$a->plugins) && file_exists("addon/{$a->module}/{$a->module}.php")) {
		include_once("addon/{$a->module}/{$a->module}.php");
		if(function_exists($a->module . '_module'))
			$a->module_loaded = true;
	}

	if((strpos($a->module,'admin') === 0) && (! is_site_admin())) {
		$a->module_loaded = false;
		notice( t('Permission denied.') . EOL);
		goaway(z_root());
	}

	/**
	 * If the site has a custom module to over-ride the standard module, use it.
	 * Otherwise, look for the standard program module in the 'mod' directory
	 */

	if(! $a->module_loaded) {
		if(file_exists("mod/site/{$a->module}.php")) {
			include_once("mod/site/{$a->module}.php");
			$a->module_loaded = true;
		}
		elseif(file_exists("mod/{$a->module}.php")) {
			include_once("mod/{$a->module}.php");
			$a->module_loaded = true;
		}
	}

	/**
	 * This provides a place for plugins to register module handlers which don't otherwise exist on the system.
	 * If the plugin sets 'installed' to true we won't throw a 404 error for the specified module even if
	 * there is no specific module file or matching plugin name.
	 * The plugin should catch at least one of the module hooks for this URL. 
	 */

	$x = array('module' => $a->module, 'installed' => false);
	call_hooks('module_loaded', $x);
	if($x['installed'])
		$a->module_loaded = true;

	/**
	 * The URL provided does not resolve to a valid module.
	 *
	 * On Dreamhost sites, quite often things go wrong for no apparent reason and they send us to '/internal_error.html'.
	 * We don't like doing this, but as it occasionally accounts for 10-20% or more of all site traffic -
	 * we are going to trap this and redirect back to the requested page. As long as you don't have a critical error on your page
	 * this will often succeed and eventually do the right thing.
	 *
	 * Otherwise we are going to emit a 404 not found.
	 */

	if(! $a->module_loaded) {

		// Stupid browser tried to pre-fetch our Javascript img template. Don't log the event or return anything - just quietly exit.
		if((x($_SERVER, 'QUERY_STRING')) && preg_match('/{[0-9]}/', $_SERVER['QUERY_STRING']) !== 0) {
			killme();
		}

		if((x($_SERVER, 'QUERY_STRING')) && ($_SERVER['QUERY_STRING'] === 'q=internal_error.html') && isset($dreamhost_error_hack)) {
			logger('index.php: dreamhost_error_hack invoked. Original URI =' . $_SERVER['REQUEST_URI']);
			goaway($a->get_baseurl() . $_SERVER['REQUEST_URI']);
		}

		logger('index.php: page not found: ' . $_SERVER['REQUEST_URI'] . ' ADDRESS: ' . $_SERVER['REMOTE_ADDR'] . ' QUERY: ' . $_SERVER['QUERY_STRING'], LOGGER_DEBUG);
		header($_SERVER['SERVER_PROTOCOL'] . ' 404 ' . t('Not Found'));
		$tpl = get_markup_template('404.tpl');
		$a->page['content'] = replace_macros($tpl, array(
				'$message' => t('Page not found.')
		));

		// pretend this is a module so it will initialise the theme
		$a->module = '404';
		$a->module_loaded = true;
	}
}


/* initialise content region */

if(! x($a->page, 'content'))
	$a->page['content'] = '';


if(! ($a->module === 'setup')) {
	/* set JS cookie */
	if($_COOKIE['jsAvailable'] != 1) {
		$a->page['content'] .= '<script>document.cookie="jsAvailable=1; path=/"; var jsMatch = /\&JS=1/; if (!jsMatch.exec(location.href)) { location.href = location.href + "&JS=1"; }</script>';
		/* emulate JS cookie if cookies are not accepted */
		if ($_GET['JS'] == 1) {
			$_COOKIE['jsAvailable'] = 1;
		}
	}

	call_hooks('page_content_top', $a->page['content']);
}


/**
 * Call module functions
 */

if($a->module_loaded) {
	$a->page['page_title'] = $a->module;
	$placeholder = '';

	/**
	 * No theme has been specified when calling the module_init functions
	 * For this reason, please restrict the use of templates to those which
	 * do not provide any presentation details - as themes will not be able
	 * to over-ride them.
	 */

	if(function_exists($a->module . '_init')) {
		call_hooks($a->module . '_mod_init', $placeholder);
		$func = $a->module . '_init';
		$func($a);
	}

	/**
	 * Do all theme initialiasion here before calling any additional module functions.
	 * The module_init function may have changed the theme.
	 * Additionally any page with a Comanche template may alter the theme.
	 * So we'll check for those now.
	 */


	/**
	 * In case a page has overloaded a module, see if we already have a layout defined
	 * otherwise, if a PDL file exists for this module, use it
	 * The member may have also created a customised PDL that's stored in the config
	 */

	load_pdl($a);

	/**
 	 * load current theme info
 	 */

	$theme_info_file = 'view/theme/' . current_theme() . '/php/theme.php';
	if (file_exists($theme_info_file)){
		require_once($theme_info_file);
	}

	if(function_exists(str_replace('-', '_', current_theme()) . '_init')) {
		$func = str_replace('-', '_', current_theme()) . '_init';
		$func($a);
	}
	elseif (x($a->theme_info, 'extends') && file_exists('view/theme/' . $a->theme_info['extends'] . '/php/theme.php')) {
		require_once('view/theme/' . $a->theme_info['extends'] . '/php/theme.php');
		if(function_exists(str_replace('-', '_', $a->theme_info['extends']) . '_init')) {
			$func = str_replace('-', '_', $a->theme_info['extends']) . '_init';
			$func($a);
		}
	}

	if(($_SERVER['REQUEST_METHOD'] === 'POST') && (! $a->error)
		&& (function_exists($a->module . '_post'))
		&& (! x($_POST, 'auth-params'))) {
		call_hooks($a->module . '_mod_post', $_POST);
		$func = $a->module . '_post';
		$func($a);
	}

	if((! $a->error) && (function_exists($a->module . '_content'))) {
		$arr = array('content' => $a->page['content']);
		call_hooks($a->module . '_mod_content', $arr);
		$a->page['content'] = $arr['content'];
		$func = $a->module . '_content';
		$arr = array('content' => $func($a));
		call_hooks($a->module . '_mod_aftercontent', $arr);
		$a->page['content'] .= $arr['content'];
	}
}

// If you're just visiting, let javascript take you home

if(x($_SESSION, 'visitor_home')) {
	$homebase = $_SESSION['visitor_home'];
} elseif(local_channel()) {
	$homebase = $a->get_baseurl() . '/channel/' . $a->channel['channel_address'];
}

if(isset($homebase)) {
	$a->page['content'] .= '<script>var homebase = "' . $homebase . '";</script>';
}

// now that we've been through the module content, see if the page reported
// a permission problem and if so, a 403 response would seem to be in order.

if(stristr(implode("", $_SESSION['sysmsg']), t('Permission denied'))) {
	header($_SERVER['SERVER_PROTOCOL'] . ' 403 ' . t('Permission denied.'));
}


call_hooks('page_end', $a->page['content']);

if(! $a->install)
	check_cron_broken();

construct_page($a);

session_write_close();
exit;