<?php
/**
 * Name: Libravatar Support
 * Description: If there is no avatar image for a new user or contact this plugin will look for one at Libravatar. Please disable Gravatar addon if you use this one. (requires PHP >= 5.3)
 * Version: 1.1
 * Author: Klaus Weidenbach <http://friendica.dszdw.net/profile/klaus>
 */

/**
 * Installs the plugin hook
 */
function libravatar_install() {
	if (! version_compare(PHP_VERSION, '5.3.0', '>=')) {
		info(t('Could NOT install Libravatar successfully.<br>It requires PHP >= 5.3') .EOL);
		// avoid registering the hook
		return false;
	}
	register_hook('avatar_lookup', 'addon/libravatar/libravatar.php', 'libravatar_lookup');

	logger("registered libravatar in avatar_lookup hook");
}

/**
 * Removes the plugin hook
 */
function libravatar_uninstall() {
	unregister_hook('avatar_lookup', 'addon/libravatar/libravatar.php', 'libravatar_lookup');

	logger("unregistered libravatar in avatar_lookup hook");
}

/**
 * Looks up the avatar at Libravatar and returns the URL.
 *
 * @param $a array
 * @param &$b array
 */
function libravatar_lookup($a, &$b) {
	$default_avatar = get_config('libravatar', 'default_img');

	if (! $default_avatar) {
		// if not set, look up if there was one from the gravatar addon
		$default_avatar = get_config('gravatar', 'default_img');
		// setting default avatar if nothing configured
		if (! $default_avatar)
			$default_avatar = 'identicon'; // default image will be a random pattern
	}

	require_once 'Services/Libravatar.php';
	$libravatar = new Services_Libravatar();
	$libravatar->setSize($b['size']);
	$libravatar->setDefault($default_avatar);
	$avatar_url = $libravatar->getUrl($b['email']);

	$b['url'] = $avatar_url;
	$b['success'] = true;
}

/**
 * Display admin settings for this addon
 */
function libravatar_plugin_admin (&$a, &$o) {
	$t = get_markup_template( "admin.tpl", "addon/libravatar" );

	$default_avatar = get_config('libravatar', 'default_img');

	// set default values for first configuration
	if(! $default_avatar)
		$default_avatar = 'identicon'; // pseudo-random geometric pattern based on email hash

	// Available options for the select boxes
	$default_avatars = array(
		'mm' => t('generic profile image'),
		'identicon' => t('random geometric pattern'),
		'monsterid' => t('monster face'),
		'wavatar' => t('computer generated face'),
		'retro' => t('retro arcade style face'),
	);

	// Show warning if PHP version is too old
	if (! version_compare(PHP_VERSION, '5.3.0', '>=')) {
		$o = '<h5>' .t('Warning') .'</h5><p>';
		$o .= sprintf(t('Your PHP version %s is lower than the required PHP >= 5.3.'), PHP_VERSION);
		$o .= '<br>' .t('This addon is not functional on your server.') .'<p><br>';
		return;
	}

	// Libravatar falls back to gravatar, so show warning about gravatar addon if enabled
	$r = q("SELECT * FROM `addon` WHERE `name` = '%s' and `installed` = 1",
		dbesc('gravatar')
	);
	if (count($r)) {
		$o = '<h5>' .t('Information') .'</h5><p>' .t('Gravatar addon is installed. Please disable the Gravatar addon.<br>The Libravatar addon will fall back to Gravatar if nothing was found at Libravatar.') .'</p><br><br>';
	}

	// output Libravatar settings
	$o .= '<input type="hidden" name="form_security_token" value="' .get_form_security_token("libravatarsave") .'">';
	$o .= replace_macros( $t, array(
		'$submit' => t('Save Settings'),
		'$default_avatar' => array('avatar', t('Default avatar image'), $default_avatar, t('Select default avatar image if none was found. See README'), $default_avatars),
	));
}

/**
 * Save admin settings
 */
function libravatar_plugin_admin_post (&$a) {
	check_form_security_token('libravatarrsave');

	$default_avatar = ((x($_POST, 'avatar')) ? notags(trim($_POST['avatar'])) : 'identicon');
	set_config('libravatar', 'default_img', $default_avatar);
	info(t('Libravatar settings updated.') .EOL);
}
?>
