<?php
/*
Plugin Name: BM Custom Login
Plugin URI: http://www.binarymoon.co.uk/projects/bm-custom-login/
Description: Display custom images on the wordpress login screen. Useful for branding.
Author: Ben Gillbanks
Version: 1.6.6
Author URI: http://www.binarymoon.co.uk/
*/

/**
 * TODO : add contextual help
 * TODO : add secondary navigation
 * TODO : full blown administration customisation
 */

define ('CL_GROUP', 'custom_login');
define ('CL_PAGE', 'custom_login_admin');
define ('CL_SECTION', 'custom_login_section');
define ('CL_OPTIONS', 'custom_login_options');
define ('CL_LOCAL', 'custom_login');

$cl_options = array ();


/**
 *
 * @global type $cl_options
 * @return type 
 */
function custom_login_get_options() {
	
	global $cl_options;
	
	if ( empty( $cl_options ) ) {
		$cl_options = get_option( CL_OPTIONS );
	}
	
	return $cl_options;
	
}


/**
 * 
 */
function bm_custom_login () {
	
	$cl_options = custom_login_get_options ();

	// default wordpress mu plugin path
	$pluginPath = '/wp-content/mu-plugins/';
	
	// is it wordpress mu or wordpress normal?
	if (!is_dir ($pluginPath)) {
		$pluginPath = '/wp-content/plugins/';
	}

	$pluginUrl = get_option ('siteurl') . $pluginPath . plugin_basename (dirname (__FILE__)) . '/bm-custom-login.css';
	
	// output styles
	echo '<link rel="stylesheet" type="text/css" href="' . $pluginUrl . '" />';
	echo '<style>';
	
	$background = $cl_options['cl_background'];
	
	if (!empty ($background)) {
?>
	#login {
		background:url(<?php echo $background; ?>) top center no-repeat;
	}
<?php
	}

	// text colour
	if (!empty ($cl_options['cl_color'])) {
?>
	#login,
	#login label {
		color:#<?php echo $cl_options['cl_color']; ?>;
	}
<?php
	}

	$body_styles = array();
	// background colour
	if (!empty ($cl_options['cl_backgroundColor'])) {
		$body_styles[] = '#' . $cl_options['cl_backgroundColor'];
	}
	if (!empty ($cl_options['cl_backgroundImage'])) {
		$body_styles[] = 'url(' . $cl_options['cl_backgroundImage'] . ')';
		if (!empty($cl_options['cl_backgroundPX'])) { $body_styles[] = $cl_options['cl_backgroundPX']; }
		if (!empty($cl_options['cl_backgroundPY'])) { $body_styles[] = $cl_options['cl_backgroundPY']; }
		if (!empty($cl_options['cl_backgroundRepeat'])) { $body_styles[] = $cl_options['cl_backgroundRepeat']; }
	}
	
	if (count($body_styles)) {
?>
	html {
		background:<?php echo implode($body_styles, ' '); ?> !important;
	}
	body.login {
		background:transparent !important;
	}
<?php
	}

	// text colour
	if (!empty ($cl_options['cl_linkColor'])) {
?>
	.login #login a {
		color:#<?php echo $cl_options['cl_linkColor']; ?> !important;
	}
<?php
	}
	
	if (!empty ($cl_options['cl_colorShadow'])) {
?>
	#login #nav,
	#login #backtoblog {
		text-shadow:0 1px 4px #<?php echo $cl_options['cl_colorShadow']; ?>;
	}
<?php
	}
	
	echo '</style>';
}


/**
 * 
 */
function custom_login_url( $url ) {

    return get_home_url();
	
}


/**
 * 
 */
function custom_login_title ($title) {
	
	$cl_options = custom_login_get_options();
	
	if (!empty ($cl_options['cl_powerby'])) {
		$title = $cl_options['cl_powerby'];
	}
	
	return $title;
	
}


/**
 *
 * @param <type> $oldText
 * @return <type>
 */
function custom_login_admin_footer_text ($old_text) {

	$cl_options = custom_login_get_options ();

	if ( ! empty( $cl_options['cl_footertext'] ) )  {
		return $cl_options['cl_footertext'];
	}
	
	return $old_text;
	
} 


/**
 * 
 */
function custom_login_admin_add_page () {
	
	add_options_page ('BM Custom Login', 'Custom Login', 'manage_options', CL_PAGE, 'custom_login_options');
	
}


/**
 * 
 */
function custom_login_options () {
?>
	
<style>
	.wrap {
		position:relative;
	}
	
	.cl_notice {
		padding:10px 20px;
		-moz-border-radius:3px;
		-webkit-border-radius:3px;
		border-radius:3px;
		background:lightyellow;
		border:1px solid #e6db55;
		margin:10px 5px 10px 0;
	}
	
	.cl_notice h3 {
		margin-top:5px;
		padding-top:0;
	}
	
	.cl_notice li {
		list-style-type:disc;
		margin-left:20px;
	}
</style>

<div class="wrap">
	<div class="icon32" id="icon-options-general"><br /></div>
	<h2>Custom Login Options</h2>
	
	<form action="options.php" method="post">
<?php	
	settings_fields (CL_GROUP);
	do_settings_sections (CL_PAGE);
?>
		<p class="submit">
			<input name="Submit" type="submit" value="<?php esc_attr_e('Save Changes'); ?>" class="button-primary" />	
		</p>
	</form>
	
	<div class="cl_notice">
		<h3>More WordPress Goodies &rsaquo;</h3>
		<p>If you like this plugin then you may also like my themes on <a href="http://prothemedesign.com" target="_blank">Pro Theme Design</a></p>
		<ul>
			<li><a href="http://twitter.com/prothemedesign">Pro Theme Design on Twitter</a></li>
			<li><a href="http://facebook.com/ProThemeDesign">Pro Theme Design on Facebook</a></li>
		</ul>
	</div>

</div>

<?php
}


/**
 * 
 */
function custom_login_init () {
	
	$vars = custom_login_get_options ();
		
	register_setting (CL_GROUP, CL_OPTIONS, 'custom_login_validate');
	add_settings_section (CL_SECTION, __('Login Screen Settings', CL_LOCAL), 'custom_login_section_validate', CL_PAGE);

	add_settings_field (
		'cl_background',
		__('Background Image Url:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_background',
			'value' => $vars,
			'default' => '',
			'description' => __('URL path to image to use for background (sized 312px wide, and around 600px tall so that it can be cropped). You can upload your image with the media uploader', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_powerby',
		__('Custom Login Powered by:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_powerby',
			'value' => $vars,
			'default' => '',
			'description' => '',
		)
	);

	add_settings_field (
		'cl_footertext',
		__('WordPress footer text:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_footertext',
			'value' => $vars,
			'default' => '',
			'description' => __('Appears at the bottom of the admin pages when logged in.', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_backgroundColor',
		__('Page Background Color:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_backgroundColor',
			'value' => $vars,
			'default' => 'eeeeee',
			'description' => __('6 digit hex color code', CL_LOCAL),
		)
	);
	
	add_settings_field (
		'cl_backgroundImage',
		__('Page Background Image:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_backgroundImage',
			'value' => $vars,
			'default' => '',
			'description' => __('Url path to image to use for the page background', CL_LOCAL),
		)
	);
	
	add_settings_field (
		'cl_backgroundPY',
		__('Page Background Vertical Position:', CL_LOCAL),
		'form_select',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_backgroundPY',
			'value' => $vars,
			'default' => 'top',
			'options' => array ('top', 'center', 'bottom'),
			'description' => __('Vertical  position of background element', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_backgroundPX',
		__('Page Background Horizontal Position:', CL_LOCAL),
		'form_select',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_backgroundPX',
			'value' => $vars,
			'default' => 'center',
			'options' => array ('left', 'center', 'right'),
			'description' => __('Horizontal position of background element', CL_LOCAL),
		)
	);
	
	add_settings_field (
		'cl_backgroundPRepeat',
		__('Page Background Repeat:', CL_LOCAL),
		'form_select',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_backgroundRepeat',
			'value' => $vars,
			'default' => 'no-repeat',
			'options' => array ('no-repeat', 'repeat-x', 'repeat-y', 'repeat'),
			'description' => __('Background image repeat', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_color',
		__('Text Color:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_color',
			'value' => $vars,
			'default' => 'ffffff',
			'description' => __('6 digit hex color code', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_colorShadow',
		__('Text Shadow Color:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_colorShadow',
			'value' => $vars,
			'default' => '000',
			'description' => __('6 digit hex color code', CL_LOCAL),
		)
	);

	add_settings_field (
		'cl_linkColor',
		__('Text Link Color:', CL_LOCAL),
		'form_text',
		CL_PAGE,
		CL_SECTION,
		array (
			'id' => 'cl_linkColor',
			'value' => $vars,
			'default' => '21759B',
			'description' => __('6 digit hex color code', CL_LOCAL),
		)
	);

}


/**
 *
 * @param type $fields
 * @return type 
 */
function custom_login_validate ($fields) {

	// colour validation
	$fields['cl_color'] = str_replace ('#', '', $fields['cl_color']);
	$fields['cl_color'] = substr ($fields['cl_color'], 0, 6);

	// shadow colour validation
	$fields['cl_colorShadow'] = str_replace ('#', '', $fields['cl_colorShadow']);
	$fields['cl_colorShadow'] = substr ($fields['cl_colorShadow'], 0, 6);

	// background colour validation
	$fields['cl_backgroundColor'] = str_replace ('#', '', $fields['cl_backgroundColor']);
	$fields['cl_backgroundColor'] = substr ($fields['cl_backgroundColor'], 0, 6);
	
	// colour validation
	$fields['cl_linkColor'] = str_replace ('#', '', $fields['cl_linkColor']);
	$fields['cl_linkColor'] = substr ($fields['cl_linkColor'], 0, 6);
	
	// clean image urls
	$fields['cl_background'] = esc_url_raw ($fields['cl_background']);
	$fields['cl_backgroundImage'] = esc_url_raw ($fields['cl_backgroundImage']);
	
	// sanitize powered by message
	$fields['cl_powerby'] = esc_html ($fields['cl_powerby']);
	$fields['cl_powerby'] = strip_tags ($fields['cl_powerby']);
		
	return $fields;
	
}


/**
 *
 * @param type $fields
 * @return type 
 */
function custom_login_section_validate ($fields) {
	
	return $fields;
	
}


/**
 *
 * @param type $args 
 */
function form_text ($args) {
	
	// defaults
	$id = '';
	$value = '';
	$description = '';
	
	// set values
	if (!empty ($args['value'][$args['id']])) {
		$value = $args['value'][$args['id']];
	} else {
		if (!empty ($args['default'])) {
			$value = $args['default'];				
		}
	}
		
	if (!empty ($args['description'])) {
		$description = $args['description'];
	}
	
	$id = $args['id'];
?>
	<input type="text" id="<?php echo $id; ?>" name="<?php echo CL_OPTIONS; ?>[<?php echo $id; ?>]" value="<?php echo $value; ?>" class="regular-text"/>
<?php
	if (!empty ($description)) {
		echo '<br /><span class="description">' . $description . '</span>';
	}
	
}


/**
 *
 * @param type $args 
 */
function form_select ($args) {
	
	// defaults
	$id = '';
	$value = '';
	$options = array();
	$description = '';
	
	if (!empty($args['options'])) {
		$options = $args['options'];
	}
	
	if (!empty($args['value'][$args['id']])) {
		$value = $args['value'][$args['id']];
	} else {
		if (!empty ($args['default'])) {
			$value = $args['default'];				
		}
	}
	
	if (!empty ($args['description'])) {
		$description = $args['description'];
	}
	
	$id = $args['id'];
	
	// display select box options list
	if ($options) {
		echo '<select id="' . $id . '" name="' . CL_OPTIONS . '[' . $id . ']">';
		foreach ($options as $o) {
			$selected = '';
			if ($o == $value) {
				$selected = ' selected="selected" ';
			}
			echo '<option value="' . $o . '" ' . $selected . '>' . $o . '</option>';
		}
		echo '</select>';		
	}
	
	if (!empty ($description)) {
		echo '<br /><span class="description">' . $description . '</span>';
	}
	
}


add_action( 'admin_init', 'custom_login_init' );
add_action( 'admin_menu', 'custom_login_admin_add_page' );
add_action( 'login_head', 'bm_custom_login' );
add_filter( 'login_headerurl', 'custom_login_url' );
add_filter( 'login_headertitle', 'custom_login_title' );
add_filter( 'admin_footer_text', 'custom_login_admin_footer_text' );