<?php
/**
 * Theme Switcher
 *
 * @package AppPresser
 * @subpackage Admin
 * @license http://www.opensource.org/licenses/gpl-license.php GPL v2.0 (or later)
 */

class AppPresser_Theme_Switcher extends AppPresser {

	public $original_template   = null;
	public $original_stylesheet = null;
	public $theme               = null;
	public $appp_theme          = false;

	/**
	 * Party Started
	 * @since 1.0.0
	 */
	public function __construct() {
		add_action( 'plugins_loaded', array( $this, 'switch_theme' ), 9999 );
		add_filter( 'pre_option_show_on_front', array( $this, 'pre_show_on_front' ) );
		add_filter( 'pre_option_page_on_front', array( $this, 'pre_page_on_front' ) );

		// cache the activated theme object
		$this->theme = wp_get_theme();
	}

	/**
	 * AppPresser theme switcher for admins
	 * @since  1.0.0
	 * @return null
	 */
	public function switch_theme() {

		if ( is_admin() )
			return;
		// Set cookie from querystring if request is coming from an app
		if ( self::is_app() ) {
			setcookie( 'AppPresser_Appp', 'true', time() + ( DAY_IN_SECONDS * 30 ) );
		}

		$do_switch = (
			// check if user is running native app
			self::is_app()
			// check if the setting is enabled to view the APP theme as an administrator
			|| ( appp_get_setting( 'admin_theme_switch' ) == 'on' && current_user_can( 'manage_options' ) )
			// it's not an app but we want to switch the theme for mobile
			|| ( ! self::is_app() && appp_get_setting( 'mobile_browser_theme_switch' ) == 'on' && wp_is_mobile() )
		) && appp_get_setting( 'appp_theme' );

		if ( ! $do_switch )
			return;

		// Get the saved setting's theme object
		$this->appp_theme = wp_get_theme( appp_get_setting( 'appp_theme' ) );

		// switch the current theme to use the AppPresser theme
		add_filter( 'option_template', array( $this, 'template_request' ), 5 );
		add_filter( 'option_stylesheet', array( $this, 'stylesheet_request' ), 5 );
		add_filter( 'template', array( $this, 'maybe_switch' ) );
	}

	/**
	 * Cache our original template and maybe switch themes
	 * @since  1.0.5
	 * @param  string  $template Template name
	 * @return string            Maybe modified template name
	 */
	public function template_request( $template ) {
		// Cache our original template request
		$this->original_template = null === $this->original_template ? $template : $this->original_template;

		return $this->maybe_switch( $template );
	}

	/**
	 * Cache our original stylesheet and maybe switch themes
	 * @since  1.0.5
	 * @param  string  $stylesheet Stylesheet template name
	 * @return string              Maybe modified template name
	 */
	public function stylesheet_request( $stylesheet ) {
		// Cache our original stylesheet request
		$this->original_stylesheet = null === $this->original_stylesheet ? $stylesheet : $this->original_stylesheet;

		return $this->maybe_switch( $stylesheet, true );
	}

	/**
	 * AppPresser switch theme function
	 * @since  1.0.0
	 * @param  string  $template           template name
	 * @param  boolean $stylesheet_request Request for template or stylesheet theme name
	 * @return string                      Modified template name
	 */
	public function maybe_switch( $template = '', $stylesheet_request = false ) {

		// Ensure we return something
		if ( ! $template ) {
			$template = $stylesheet_request
				? $this->original_stylesheet
				: $this->original_template;
		}

		// If we're not doing the theme switch, bail
		if ( ! $this->appp_theme )
			return $template;

		// Ok, do the template switch
		$template = $stylesheet_request
			// If a request for the stylesheet dir name, give back our setting
			? appp_get_setting( 'appp_theme' )
			// Otherwise, give back our saved settings parent theme dir (if it has one)
			: $this->appp_theme->get_template();

		// return the switched template
		return $template;
	}

	/**
	 * AppPresser set the default home page view to page if running the APPP theme
	 * @since  1.0.0
	 * @return 'page' if APPP theme is running
	 */
	public function pre_show_on_front() {

		$this->theme = wp_get_theme();
		if ( $this->theme->template == $this->maybe_switch() && ! is_admin() ) {
			return 'page';
		}

		return false;
	}

	/**
	 * AppPresser set the default home page based on the APPP settings
	 * @since  1.0.0
	 * @return page ID stored in APPP settings
	 */
	public function pre_page_on_front() {

		$this->theme = wp_get_theme();
		if ( $this->theme->template == $this->maybe_switch() && ! is_admin() ) {
			return appp_get_setting( 'appp_home_page' );
	  	}

		return false;
	}

}

/**
 * AppPresser detect iOS function
 * @since  1.0.0
 * @return true if device is running iOS
 */
function appp_is_ios() {
	$ua = strtolower( $_SERVER['HTTP_USER_AGENT'] );
	return ( strstr( $ua, 'iphone' ) || strstr( $ua, 'ipod' ) || strstr( $ua, 'ipad' )
	);
}

/**
 * AppPresser detect Android function
 * @since  1.0.0
 * @return true if device is running Android
 */
function appp_is_android() {
	$ua = strtolower( $_SERVER['HTTP_USER_AGENT'] );
	return ( false !== stripos( $ua, 'android' ) );
}