<?php
/**
 * Customize Setting Class
 *
 * @package WordPress
 * @subpackage Customize
 * @since 3.4.0
 */
 
class WP_Customize_Setting {
	public $id;
	public $priority          = 10;
	public $section           = '';
	public $label             = '';
	public $control           = 'text';
	public $type              = 'theme_mod';
	public $choices           = array();
	public $capability        = 'edit_theme_options';
	public $theme_supports    = '';
	public $default           = '';
	public $sanitize_callback = '';

	protected $id_data = array();
	private $_post_value; // Cached, sanitized $_POST value.

	// Prefix for $_POST values to prevent naming conflicts.
	const name_prefix = 'customize_';

	/**
	 * Constructor.
	 *
	 * @since 3.4.0
	 *
	 * @param string $id An specific ID of the setting. Can be a
	 *                   theme mod or option name.
	 * @param array $args Setting arguments.
	 */
	function __construct( $id, $args = array() ) {
		$keys = array_keys( get_class_vars( __CLASS__ ) );
		foreach ( $keys as $key ) {
			if ( isset( $args[ $key ] ) )
				$this->$key = $args[ $key ];
		}

		$this->id = $id;

		// Parse the ID for array keys.
		$this->id_data[ 'keys' ] = preg_split( '/\[/', str_replace( ']', '', $this->id ) );
		$this->id_data[ 'base' ] = array_shift( $this->id_data[ 'keys' ] );

		// Rebuild the ID.
		$this->id = $this->id_data[ 'base' ];
		if ( ! empty( $this->id_data[ 'keys' ] ) )
			$this->id .= '[' . implode( '][', $this->id_data[ 'keys' ] ) . ']';

		if ( $this->sanitize_callback != '' )
			add_filter( "customize_sanitize_{$this->id}", $this->sanitize_callback );

		return $this;
	}

	/**
	 * Enqueue setting related scripts/styles.
	 *
	 * @since 3.4.0
	 */
	public function enqueue() {
		switch( $this->control ) {
			case 'color':
				wp_enqueue_script( 'farbtastic' );
				wp_enqueue_style( 'farbtastic' );
				break;
		}
	}

	/**
	 * Handle previewing the setting.
	 *
	 * @since 3.4.0
	 */
	public function preview() {
		switch( $this->type ) {
			case 'theme_mod' :
				add_filter( 'theme_mod_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) );
				break;
			case 'option' :
				if ( empty( $this->id_data[ 'keys' ] ) )
					add_filter( 'pre_option_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) );
				else
					add_filter( 'option_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) );
				break;
			default :
				do_action( 'customize_preview_' . $this->id );
		}
	}

	/**
	 * Callback function to filter the theme mods and options.
	 *
	 * @since 3.4.0
	 * 
	 * @param mixed Old value.
	 * @return mixed New or old value.
	 */
	public function _preview_filter( $original ) {
		return $this->multidimensional_replace( $original, $this->id_data[ 'keys' ], $this->post_value() );
	}

	/**
	 * Set the value of the parameter for a specific theme.
	 *
	 * @since 3.4.0
	 *
	 * @return bool False if cap check fails or value isn't set.
	 */
	public final function save() {
		$value = $this->post_value();

		if ( ! $this->check_capabilities() || ! isset( $value ) )
			return false;

		do_action( 'customize_save_' . $this->id_data[ 'base' ] );

		$this->update( $value );
	}

	/**
	 * Fetches, validates, and sanitizes the $_POST value.
	 *
	 * @since 3.4.0
	 *
	 * @param $default mixed A default value which is used as a fallback. Default is null.
	 * @return mixed Either the default value on failure or sanitized value.
	 */
	public final function post_value( $default = null ) {
		if ( isset( $this->_post_value ) )
			return $this->_post_value;

		$base = self::name_prefix . $this->id_data[ 'base' ];

		if ( ! isset( $_POST[ $base ] ) )
			return $default;

		$result = $this->multidimensional_get( $_POST[ $base ], $this->id_data[ 'keys' ] );
		if ( ! isset( $result ) )
			return $default;

		$result = $this->sanitize( $result );
		if ( isset( $result ) )
			return $this->_post_value = $result;
		else
			return $default;
	}

	/**
	 * Sanitize an input.
	 *
	 * @since 3.4.0
	 *
	 * @param $value mixed The value to sanitize.
	 * @return mixed Null if an input isn't valid, otherwise the sanitized value.
	 */
	public function sanitize( $value ) {
		return apply_filters( "customize_sanitize_{$this->id}", $value );
	}

	/**
	 * Set the value of the parameter for a specific theme.
	 *
	 * @since 3.4.0
	 *
	 * @param $value mixed The value to update.
	 * @return mixed The result of saving the value.
	 */
	protected function update( $value ) {
		switch( $this->type ) {
			case 'theme_mod' :
				return $this->_update_theme_mod( $value );
				break;
			case 'option' :
				return $this->_update_option( $value );
				break;
			default :
				return do_action( 'customize_update_' . $this->type, $value );
		}
	}

	/**
	 * Update the theme mod from the value of the parameter.
	 *
	 * @since 3.4.0
	 *
	 * @param $value mixed The value to update.
	 * @return mixed The result of saving the value.
	 */
	protected function _update_theme_mod( $value ) {
		// Handle non-array theme mod.
		if ( empty( $this->id_data[ 'keys' ] ) )
			return set_theme_mod( $this->id_data[ 'base' ], $value );

		// Handle array-based theme mod.
		$mods = get_theme_mod( $this->id_data[ 'base' ] );
		$mods = $this->multidimensional_replace( $mods, $this->id_data[ 'keys' ], $value );
		if ( isset( $mods ) )
			return set_theme_mod( $this->id_data[ 'base' ], $mods );
	}

	/**
	 * Update the theme mod from the value of the parameter.
	 *
	 * @since 3.4.0
	 *
	 * @param $value mixed The value to update.
	 * @return mixed The result of saving the value.
	 */
	protected function _update_option( $value ) {
		// Handle non-array option.
		if ( empty( $this->id_data[ 'keys' ] ) )
			return update_option( $this->id_data[ 'base' ], $value );

		// Handle array-based options.
		$options = get_option( $this->id_data[ 'base' ] );
		$options = $this->multidimensional_replace( $options, $this->id_data[ 'keys' ], $value );
		if ( isset( $options ) )
			return update_option( $this->id_data[ 'base' ], $options );
	}

	/**
	 * Fetch the value of the parameter for a specific theme.
	 *
	 * @since 3.4.0
	 *
	 * @return mixed The requested value.
	 */
	public function value() {
		switch( $this->type ) {
			case 'theme_mod' :
				$function = 'get_theme_mod';
				break;
			case 'option' :
				$function = 'get_option';
				break;
			default :
				return apply_filters( 'customize_value_' . $this->id_data[ 'base' ], $this->default );
		}

		// Handle non-array value
		if ( empty( $this->id_data[ 'keys' ] ) )
			return $function( $this->id_data[ 'base' ], $this->default );

		// Handle array-based value
		$values = $function( $this->id_data[ 'base' ] );
		return $this->multidimensional_get( $values, $this->id_data[ 'keys' ], $this->default );
	}

	/**
	 * Check if the theme supports the setting and check user capabilities.
	 *
	 * @since 3.4.0
	 *
	 * @return bool False if theme doesn't support the setting or user can't change setting, otherwise true.
	 */
	public final function check_capabilities() {
		global $customize;

		if ( ! $this->capability || ! current_user_can( $this->capability ) )
			return false;

		if ( $this->theme_supports && ! current_theme_supports( $this->theme_supports ) )
			return false;

		$section = $customize->get_section( $this->section );
		if ( isset( $section ) && ! $section->check_capabilities() )
			return false;

		return true;
	}

	/**
	 * Render the control.
	 *
	 * @since 3.4.0
	 */
	public final function _render() {
		if ( ! $this->check_capabilities() )
			return;

		do_action( 'customize_render_' . $this->id );

		$this->render();
	}

	/**
	 * Render the control.
	 *
	 * @since 3.4.0
	 */
	protected function render() {
		$this->_render_type();
	}

	/**
	 * Retrieve the name attribute for an input.
	 *
	 * @since 3.4.0
	 *
	 * @return string The name.
	 */
	public final function get_name() {
		return self::name_prefix . esc_attr( $this->id );
	}

	/**
	 * Echo the HTML name attribute for an input.
	 *
	 * @since 3.4.0
	 *
	 * @return string The HTML name attribute.
	 */
	public final function name() {
		echo 'name="' . $this->get_name() . '"';
	}

	/**
	 * Render the control type.
	 *
	 * @todo Improve value and checked attributes.
	 *
	 * @since 3.4.0
	 */
	public final function _render_type() {
		switch( $this->control ) {
			case 'text':
				?>
				<label><?php echo esc_html( $this->label ); ?><br/>
					<input type="text" value="<?php echo esc_attr( $this->value() ); ?>" <?php $this->name(); ?> />
				</label>
				<?php
				break;
			case 'color':
				?>
				<label><?php echo esc_html( $this->label ); ?><br/>
					<span class="hex-prepend">#</span>
					<input type="text" class="hex-input" value="<?php echo esc_attr( $this->value() ); ?>" <?php $this->name(); ?> />
					<a href="#" class="pickcolor hex-color-example"></a>
				</label>
				<?php
				break;
			case 'checkbox':
				?>
				<label>
					<input type="checkbox" value="<?php echo esc_attr( $this->value() ); ?>" <?php $this->name(); checked( $this->value() ); ?> />
					<?php echo esc_html( $this->label ); ?>
				</label>
				<?php
				break;
			case 'radio':
				if ( empty( $this->choices ) )
					return;

				echo esc_html( $this->label ) . '<br/>';
				foreach ( $this->choices as $value => $label ) :
					?>
					<label>
						<input type="radio" value="<?php echo esc_attr( $value ); ?>" <?php $this->name(); checked( $this->value(), $value ); ?> />
						<?php echo esc_html( $label ); ?><br/>
					</label>
					<?php
				endforeach;
				break;
			case 'select':
				if ( empty( $this->choices ) )
					return;

				?>
				<label><?php echo esc_html( $this->label ); ?><br/>
				<select <?php $this->name(); ?>>
					<?php
					foreach ( $this->choices as $value => $label )
						echo '<option value="' . esc_attr( $value ) . '"' . selected( $this->value(), $value, false ) . '>' . $label . '</option>';
					?>
				</select>
				<?php
				break;
			default:
				do_action( 'customize_render_control-' . $this->control, $this );

		}
	}

	/**
	 * Multidimensional helper function.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param bool $create Default is false.
	 * @return null|array
	 */
	final protected function multidimensional( $root, $keys, $create = false ) {
		if ( $create && empty( $root ) )
			$root = array();

		if ( ! isset( $root ) || empty( $keys ) )
			return;

		$last = array_pop( $keys );
		$node = &$root;

		foreach ( $keys as $key ) {
			if ( $create && ! isset( $node[ $key ] ) )
				$node[ $key ] = array();

			if ( ! is_array( $node ) || ! isset( $node[ $key ] ) )
				return;

			$node = &$node[ $key ];
		}

		if ( $create && ! isset( $node[ $last ] ) )
			$node[ $last ] = array();

		if ( ! isset( $node[ $last ] ) )
			return;

		return array(
			'root' => &$root,
			'node' => &$node,
			'key'  => $last,
		);
	}

	/**
	 * Will attempt to replace a specific value in a multidimensional array.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param mixed $value The value to update.
	 * @return
	 */
	final protected function multidimensional_replace( $root, $keys, $value ) {
		if ( ! isset( $value ) )
			return $root;
		elseif ( empty( $keys ) ) // If there are no keys, we're replacing the root.
			return $value;

		$result = $this->multidimensional( &$root, $keys, true );

		if ( isset( $result ) )
			$result['node'][ $result['key'] ] = $value;

		return $root;
	}

	/**
	 * Will attempt to fetch a specific value from a multidimensional array.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param $default A default value which is used as a fallback. Default is null.
	 * @return mixed The requested value or the default value.
	 */
	final protected function multidimensional_get( $root, $keys, $default = null ) {
		if ( empty( $keys ) ) // If there are no keys, test the root.
			return isset( $root ) ? $root : $default;

		$result = $this->multidimensional( $root, $keys );
		return isset( $result ) ? $result['node'][ $result['key'] ] : $default;
	}

	/**
	 * Will attempt to check if a specific value in a multidimensional array is set.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @return bool True if value is set, false if not.
	 */
	final protected function multidimensional_isset( $root, $keys ) {
		$result = $this->multidimensional_get( $root, $keys );
		return isset( $result );
	}
}