<?php

/**
 * Class MC4WP_Form_Element
 *
 * @since 3.0
 * @ignore
 * @access private
 */
class MC4WP_Form_Element {


	/**
	 * @var string
	 */
	public $ID;

	/**
	 * @var MC4WP_Form
	 */
	public $form;

	/**
	 * @var array
	 *
	 * Can be used to set element-specific config settings. Accepts the following keys.
	 *
	 * - lists: Customized number of Mailchimp list ID's to subscribe to.
	 * - email_type: The email type
	 */
	public $config = array();

	/**
	 * @var bool
	 */
	public $is_submitted = false;

	/**
	 * @param MC4WP_Form $form
	 * @param string $id
	 * @param array $config
	 */
	public function __construct( MC4WP_Form $form, $id, array $config = array() ) {
		$this->form   = $form;
		$this->ID     = $id;
		$this->config = $config;

		$this->is_submitted = $this->form->is_submitted
								&& $this->form->config['element_id'] === $this->ID;
	}


	/**
	 * @return string
	 */
	protected function get_visible_fields() {
		$content = $this->form->content;
		$form    = $this->form;
		$element = $this;

		/**
		 * Filters the HTML for the form fields.
		 *
		 * Use this filter to add custom HTML to a form programmatically
		 *
		 * @param string $content
		 * @param MC4WP_Form $form
		 * @param MC4WP_Form_Element $element
		 * @since 2.0
		 */
		$visible_fields = (string) apply_filters( 'mc4wp_form_content', $content, $form, $element );

		return $visible_fields;
	}

	/**
	 * @return string
	 */
	protected function get_hidden_fields() {

		// hidden fields
		$hidden_fields  = '<label style="display: none !important;">' . __( 'Leave this field empty if you\'re human:', 'mailchimp-for-wp' ) . ' ' . '<input type="text" name="_mc4wp_honeypot" value="" tabindex="-1" autocomplete="off" /></label>';
		$hidden_fields .= '<input type="hidden" name="_mc4wp_timestamp" value="' . time() . '" />';
		$hidden_fields .= '<input type="hidden" name="_mc4wp_form_id" value="' . esc_attr( $this->form->ID ) . '" />';
		$hidden_fields .= '<input type="hidden" name="_mc4wp_form_element_id" value="' . esc_attr( $this->ID ) . '" />';

		// was "lists" parameter passed in shortcode arguments?
		if ( ! empty( $this->config['lists'] ) ) {
			$lists_string   = is_array( $this->config['lists'] ) ? join( ',', $this->config['lists'] ) : $this->config['lists'];
			$hidden_fields .= '<input type="hidden" name="_mc4wp_lists" value="' . esc_attr( $lists_string ) . '" />';
		}

		// was "lists" parameter passed in shortcode arguments?
		if ( ! empty( $this->config['email_type'] ) ) {
			$hidden_fields .= '<input type="hidden" name="_mc4wp_email_type" value="' . esc_attr( $this->config['email_type'] ) . '" />';
		}

		return (string) $hidden_fields;
	}

	/**
	 * Get HTML string for a notice, including wrapper element.
	 *
	 * @param MC4WP_Form_Notice $notice
	 *
	 * @return string
	 */
	protected function get_notice_html( MC4WP_Form_Notice $notice ) {
		if ( $notice->text === '' ) {
			return '';
		}

		$html = sprintf( '<div class="mc4wp-alert mc4wp-%s" role="alert"><p>%s</p></div>', esc_attr( $notice->type ), $notice->text );
		return $html;
	}

	/**
	 * Gets the form response string
	 *
	 * @param boolean $force_show
	 * @return string
	 */
	public function get_response_html( $force_show = false ) {
		$html = '';
		$form = $this->form;

		if ( $this->is_submitted || $force_show ) {
			foreach ( $this->form->notices as $notice ) {
				$html .= $this->get_notice_html( $notice );
			}
		}

		/**
		 * Filter the form response HTML
		 *
		 * Use this to add your own HTML to the form response. The form instance is passed to the callback function.
		 *
		 * @since 3.0
		 *
		 * @param string $html The complete HTML string of the response, excluding the wrapper element.
		 * @param MC4WP_Form $form The form object
		 */
		$html = (string) apply_filters( 'mc4wp_form_response_html', $html, $form );

		// wrap entire response in div, regardless of a form was submitted
		$html = '<div class="mc4wp-response">' . $html . '</div>';
		return $html;
	}

	/**
	 * @return string
	 */
	protected function get_response_position() {
		$position = 'after';
		$form     = $this->form;

		// check if content contains {response} tag
		if ( stripos( $this->form->content, '{response}' ) !== false ) {
			return '';
		}

		/**
		 * Filters the position for the form response.
		 *
		 * Valid values are "before" and "after". Will have no effect if `{response}` is used in the form content.
		 *
		 * @param string $position
		 * @param MC4WP_Form $form
		 * @since 2.0
		 */
		$response_position = (string) apply_filters( 'mc4wp_form_response_position', $position, $form );

		return $response_position;
	}

	/**
	 * Get HTML to be added _before_ the HTML of the form fields.
	 *
	 * @return string
	 */
	protected function get_html_before_fields() {
		$html = '';
		$form = $this->form;

		/**
		 * Filters the HTML before the form fields.
		 *
		 * @param string $html
		 * @param MC4WP_Form $form
		 * @ignore
		 */
		$html = (string) apply_filters( 'mc4wp_form_before_fields', $html, $form );

		if ( $this->get_response_position() === 'before' ) {
			$html = $html . $this->get_response_html();
		}

		return $html;
	}

	/**
	 * Get HTML to be added _after_ the HTML of the form fields.
	 *
	 * @return string
	 */
	protected function get_html_after_fields() {
		$html = '';
		$form = $this->form;

		/**
		 * Filters the HTML after the form fields.
		 *
		 * @param string $html
		 * @param MC4WP_Form $form
		 * @ignore
		 */
		$html = (string) apply_filters( 'mc4wp_form_after_fields', $html, $form );

		if ( $this->get_response_position() === 'after' ) {
			$html = $this->get_response_html() . $html;
		}

		return $html;
	}

	/**
	 * Get all HTMl attributes for the form element
	 *
	 * @return string
	 */
	protected function get_form_element_attributes() {
		$form                  = $this;
		$form_action_attribute = null;

		$attributes = array(
			'id'    => $this->ID,
			'class' => $this->get_css_classes(),
		);

		/**
		 * Filters the `action` attribute of the `<form>` element.
		 *
		 * Defaults to `null`, which means no `action` attribute will be printed.
		 *
		 * @param string $form_action_attribute
		 * @param MC4WP_Form $form
		 */
		$form_action_attribute = apply_filters( 'mc4wp_form_action', $form_action_attribute, $form );
		if ( is_string( $form_action_attribute ) ) {
			$attributes['action'] = $form_action_attribute;
		}

		/**
		 * Filters all attributes to be added to the `<form>` element
		 *
		 * @param array $attributes Key-value pairs of attributes.
		 * @param MC4WP_Form $form
		 */
		$attributes = (array) apply_filters( 'mc4wp_form_element_attributes', $attributes, $form );

		// hardcoded attributes, can not be changed.
		$attributes['method']    = 'post';
		$attributes['data-id']   = $this->form->ID;
		$attributes['data-name'] = $this->form->name;

		// build string of key="value" from array
		$string = '';
		foreach ( $attributes as $name => $value ) {
			$string .= sprintf( '%s="%s" ', $name, esc_attr( $value ) );
		}

		return $string;
	}

	/**
	 * @param array|null $config Use this to override the configuration for this form element
	 * @return string
	 */
	public function generate_html( array $config = null ) {
		if ( $config ) {
			$this->config = $config;
		}

		// return empty string if form is in trash
		if ( $this->form->status !== 'publish' ) {
			return '';
		}

		// Start building content string
		$opening_html  = '<!-- Mailchimp for WordPress v' . MC4WP_VERSION . ' - https://wordpress.org/plugins/mailchimp-for-wp/ -->';
		$opening_html .= '<form ' . $this->get_form_element_attributes() . '>';
		$before_fields = $this->get_html_before_fields();
		$fields        = '';
		$after_fields  = $this->get_html_after_fields();
		$closing_html  = '</form><!-- / Mailchimp for WordPress Plugin -->';

		if ( ! $this->is_submitted
			|| ! $this->form->settings['hide_after_success']
			|| $this->form->has_errors() ) {

			// add HTML for fields + wrapper element.
			$fields = '<div class="mc4wp-form-fields">' .
				$this->get_visible_fields() .
				'</div>' .
				$this->get_hidden_fields();
		}

		// concatenate everything
		$output = $opening_html .
					$before_fields .
					$fields .
					$after_fields .
					$closing_html;

		return $output;
	}

	/**
	 * Get a space separated list of CSS classes for this form
	 *
	 * @return string
	 */
	protected function get_css_classes() {
		$classes = array();
		$form    = $this->form;

		$classes[] = 'mc4wp-form';
		$classes[] = 'mc4wp-form-' . $form->ID;

		// Add form classes if this specific form element was submitted
		if ( $this->is_submitted ) {
			$classes[] = 'mc4wp-form-submitted';

			if ( ! $form->has_errors() ) {
				$classes[] = 'mc4wp-form-success';
			} else {
				$classes[] = 'mc4wp-form-error';
			}
		}

		// add class for CSS targeting in custom stylesheets
		if ( ! empty( $form->settings['css'] ) ) {
			if ( strpos( $form->settings['css'], 'theme-' ) === 0 ) {
				$classes[] = 'mc4wp-form-theme';
			}

			$classes[] = 'mc4wp-form-' . $form->settings['css'];
		}

		// add classes from config array
		if ( ! empty( $this->config['element_class'] ) ) {
			$classes = array_merge( $classes, explode( ' ', $this->config['element_class'] ) );
		}

		/**
		 * Filters `class` attributes for the `<form>` element.
		 *
		 * @param array $classes
		 * @param MC4WP_Form $form
		 */
		$classes = apply_filters( 'mc4wp_form_css_classes', $classes, $form );

		return implode( ' ', $classes );
	}
}

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