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• EPL_Advanced_Shortcode_Listing
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<?php
/**
 * Form Builder Object
 *
 * @package     EPL
 * @subpackage  Classes/Forms
 * @copyright   Copyright (c) 2019, Merv Barrett
 * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since       2.3
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// phpcs:disable WordPress.Security.NonceVerification

/**
 * EPL_FORM_BUILDER Class
 *
 * @since 2.3
 */
class EPL_FORM_BUILDER {

    /**
     * Prefix for this class, will be used for filters & actions
     *
     * @var string $prefix Prefix name.
     * @since 2.3
     */
    private $prefix = 'epl_form_builder_';

    /**
     * Text domain for translation
     *
     * @var string $text_domain Text domain name.
     * @since 2.3
     */
    private $text_domain = 'easy-property-listings';

    /**
     * Form fields
     *
     * @var array $form_fields Form fields.
     * @since 2.3
     */
    public $form_fields = array();

    /**
     * Form sections
     *
     * @var array $form_sections Form sections.
     * @since 2.3
     */
    public $form_sections = array();

    /**
     * Classes for form and fields
     *
     * @var array $form_classes Form css classes.
     * @since 2.3
     */
    private $form_classes = array();

    /**
     * Configuration of this form
     *
     * @var array $configuration Settings of the form.
     * @since 2.3
     */
    public $configuration = array();

    /**
     * Form has nonce or not
     *
     * @var bool $has_nonce Security field.
     * @since 2.3
     */
    public $has_nonce = false;

    /**
     * Holds the list of form attributes, defaults & added by user
     *
     * @var array $form_attributes Form options.
     * @since 2.3
     */
    public $form_attributes = array();

        /**
     * Holds the nonce key
     *
     * @var array $nonce_key nonce key.
     * @since 2.3
     */
        public $nonce_key;

        /**
     * Holds the nonce value
     *
     * @var array $nonce_value nonce value.
     * @since 2.3
     */
        public $nonce_value;

    /**
     * Get things going
     *
     * @param array $config Form ptions.
     * @since 2.3
     */
    public function __construct( $config = array() ) {

        $defaults = array(
            'form_tag'        => 'on',
            'form_wrap'       => 'on',
            'form_context'    => 'default', // default , meta , settings.
            'callback_action' => null,
            'is_ajax'         => false,
        );

        $this->configuration = shortcode_atts( $defaults, $config );

        // Set form defaults.
        $this->set_defaults();

    }

    /**
     * Call default & user submitted callbacks for this form upon form submission
     *
     * @since 2.3
     * @return null
     */
    public function __destruct() {
        $this->callbacks();
    }

    /**
     * Call default & user submitted callbacks for this form upon form submission
     *
     * @param string $key Meta key.
     * @return string
     * @since 2.3
     */
    public function __get( $key ) {
        return isset( $this->{$key} ) ? $this->{$key} : null;
    }

    /**
     * Callbacks
     *
     * @since 2.3
     */
    public function callbacks() {

        if ( isset( $_REQUEST[ $this->prefix . 'form_submit' ] ) ) {

            // Hook to this action to save form data.
            do_action( $this->prefix . 'save_form', get_object_vars( $this ), $_REQUEST );

            // Run user defined hook if applicable.
            if ( ! is_null( $this->configuration['callback_action'] ) ) {
                do_action( $this->prefix . $this->configuration['callback_action'], get_object_vars( $this ), $_REQUEST );
            }
        }
    }

    /**
     * Set form configuration
     *
     * @param string $key Meta key.
     *
     * @return bool|mixed
     * @since 2.3
     */
    public function get_configuration( $key = '' ) {
        return isset( $this->configuration[ $key ] ) ? $this->configuration[ $key ] : false;
    }

    /**
     * Get value
     *
     * @param string $field Field meta key.
     *
     * @return mixed|string
     * @since 2.3
     */
    public function get_value( $field ) {
        // phpcs:disable
        switch ( $this->configuration['form_context'] ) {

            case 'default':
                return isset( $field['value'] ) ? $field['value'] : ( isset( $field['default'] ) ? $field['default'] : '' );
            break;

            case 'meta':
                global $post;
                return isset( $field['name'] ) ? get_post_meta( $post->ID, $field['name'], true ) : '';
            break;

            case 'settings':
                global $epl_settings;
                return isset( $field['name'] ) ? $epl_settings[ $field['name'] ] : '';
            break;

        }
        // phpcs:enable
    }

    /**
     * Set form classes
     *
     * @since 2.3
     */
    public function set_form_classes() {

        $this->form_classes = apply_filters(
            $this->prefix . 'form_classes',
            array(
                'form_container'  => array(
                    $this->prefix . 'form_container',
                    'row',
                ),
                'form'            => array(
                    $this->prefix . 'form',
                    'col-md-12',
                ),
                'field_container' => array(
                    $this->prefix . 'field_container',
                    'col-md-12',
                ),
                'field'           => array(
                    $this->prefix . 'field',
                    'col-md-12',
                ),
                'label_container' => array(
                    $this->prefix . 'label_container',
                    'col-md-12',
                ),
                'label'           => array(
                    $this->prefix . 'label',
                    'col-md-12',
                ),
            ),
            $this->form_attributes
        );
    }

    /**
     * List of invalid attributes per field type that must be removed from field array before field rendering
     *
     * @since 2.3
     */
    public function invalid_attributes() {
        return apply_filters(
            $this->prefix . 'invalid_attributes',
            array(
                'label'   => array( 'all' ),
                'default' => array( 'all' ),
                'opts'    => array( 'all' ),
            )
        );
    }

    /**
     * Get classes for wrappers, form , fields
     *
     * @param string $key Meta key.
     * @param array  $field Field type.
     *
     * @return string
     * @since 2.3
     */
    public function get_class( $key = '', $field = array() ) {

        if ( isset( $this->form_classes[ $key ] ) ) {
            $classes = implode( ' ', array_map( 'sanitize_html_class', $this->form_classes[ $key ] ) );
            if ( isset( $field['type'] ) ) {
                $classes .= ' ' . $this->prefix . $key . '_' . $field['type'];
            }

            if ( 'field' === $key && isset( $field['class'] ) ) {

                if ( is_array( $field['class'] ) && count( $field['class'] ) > 0 ) {
                    $classes .= implode( ' ', array_map( 'sanitize_html_class', $field['class'] ) );
                } else {
                    $classes .= ' ' . $field['class'];
                }
            }
            return $classes;
        }
    }

    /**
     * Get Field Attributes
     *
     * @param array $field Fields.
     *
     * @return string
     * @since 2.3
     */
    public function get_attributes( $field ) {

        $html        = '';
        $field['id'] = isset( $field['id'] ) ? $field['id'] : '';

        if ( empty( $field['id'] ) ) {
            $field['id'] = isset( $field['name'] ) ? epl_sanitize_key( $field['name'] ) : '';
        }

        $invalid_attributes = $this->invalid_attributes();

        foreach ( $field as $key  => $value ) {

            if ( isset( $invalid_attributes[ $key ] ) && ( in_array( $field['type'], $invalid_attributes[ $key ], true ) || in_array( 'all', $invalid_attributes[ $key ], true ) ) ) { //phpcs:ignore
                // This attribute is not valid for current input type, lets skip it.
            } else {

                if ( 'name' === $key ) {
                    $value = esc_attr( $value );
                }
                if ( isset( $field['multiple'] ) && in_array( $field['type'], array( 'select', 'checkbox' ), true ) && 'name' === $key ) {
                    $value = $value . '[]';
                }
                $value = is_array( $value ) ? implode( ',', $value ) : $value;
                $html .= $key . '="' . $value . '" ';
            }
        }
        return $html;
    }

    /**
     * The public function can be used to configure the attributes of form
     *
     * @param string|array $key Meta key.
     * @param string $value Field value.
     *
     * @since 2.3
     */
    public function set_form_attributes( $key = '', $value = '' ) {

        // If user wants to add a single attribute.
        if ( ! empty( $key ) && is_string( $key ) ) {
            $this->form_attributes[ $this->escape( 'text', $key ) ] = $this->escape( 'attribute', $value );

        } elseif ( is_array( $key ) & ! empty( $key ) ) {

            // Multiple attrubtes at once.
            foreach ( $key as $index  => $val ) {
                $this->form_attributes[ $this->escape( 'text', $index ) ] = $this->escape( 'attribute', $val );
            }
        }
    }

    /**
     * Set default attributes for the form tag
     *
     * @since 2.3
     */
    private function set_default_form_attributes() {

        $this->form_attributes = apply_filters(
            $this->prefix . 'form_default_attributes',
            array(
                'action'  => '',
                'id'      => '',
                'class'   => '',
                'enctype' => '',
                'method'  => 'POST',
                'name'    => '',
            )
        );

        if ( true === $this->configuration['is_ajax'] ) {
            $this->form_attributes[ 'data-' . $this->prefix . 'ajax_submit' ] = 'true';
        }
    }

    /**
     * Sets up all the form defaults while object instantiation
     *
     * @since 2.3
     */
    private function set_defaults() {

        do_action( $this->prefix . 'before_setup_defaults' );
        $this->set_default_form_attributes();
        $this->set_form_classes();
        do_action( $this->prefix . 'after_setup_defaults' );
    }

    /**
     * Escape necessary data
     *
     * @param string $type Field type.
     * @param string $value Field value.
     *
     * @return string|void
     * @since 2.3
     */
    private function escape( $type = '', $value = '' ) {
        // phpcs:disable
        switch ( $type ) {

            case 'url':
                return esc_url( $value );
            break;

            case 'class':
            case 'id':
                return sanitize_html_class( $value );
            break;

            case 'text':
                return sanitize_text_field( $value );
            break;
            case 'attribute':
                return esc_attr( $value );
        } // phpcs:enable
    }

    /**
     * Add multiple form sections at once
     *
     * @param array $sections Field sections.
     * @since 2.3
     */
    public function add_sections( $sections = array() ) {

        foreach ( $sections as $section ) {
            $this->add_section( $section );
        }
    }

    /**
     * Add single section to form
     *
     * @param array $section Field sections.
     * @since 2.3
     */
    public function add_section( $section = array() ) {
        $this->form_sections[] = $section;
    }

    /**
     * Add single field to form
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    public function add_field( $field = array() ) {
        foreach ( $field as $key  => &$val ) {
            if ( is_string( $val ) ) {
                $val = esc_attr( $val );
            }
        }
        $this->form_fields[] = $field;
    }

    /**
     * Add multiple form fields at once
     *
     * @param array $fields Fields array.
     * @since 2.3
     */
    public function add_fields( $fields = array() ) {

        foreach ( $fields as $field ) {
            $this->add_field( $field );
        }

        $this->add_field(
            array(
                'type'  => 'hidden',
                'name'  => $this->prefix . 'form_submit',
                'value' => 'true',
            )
        );

        if ( ! is_null( $this->configuration['callback_action'] ) ) {
            $this->add_field(
                array(
                    'type'  => 'hidden',
                    'name'  => $this->prefix . 'form_action',
                    'value' => $this->prefix . $this->configuration['callback_action'],
                )
            );
        }
    }

    /**
     * Render form html based on the fields & form attributes
     *
     * @since 2.3
     */
    public function render_form() {

        ob_start();

        if ( 'on' === $this->get_configuration( 'form_wrap' ) ) {
            do_action( 'before_' . $this->prefix . 'form_container_open' );
            $this->render_form_container_open();
        }

        if ( 'on' === $this->get_configuration( 'form_tag' ) ) {
            do_action( 'before_' . $this->prefix . 'form_open' );
            $this->render_form_open();
        }

        do_action( 'before_' . $this->prefix . 'form_sections' );
        $this->render_sections();
        do_action( 'after_' . $this->prefix . 'form_sections' );

        do_action( 'before_' . $this->prefix . 'form_fields' );
        $this->render_fields();
        do_action( 'after_' . $this->prefix . 'form_fields' );

        if ( 'on' === $this->get_configuration( 'form_tag' ) ) {
            $this->render_form_close();
            do_action( 'after_' . $this->prefix . 'form_close' );
        }

        if ( 'on' === $this->get_configuration( 'form_wrap' ) ) {
            $this->render_form_container_close();
            do_action( 'after_' . $this->prefix . 'form_container_close' );
        }

        echo ob_get_clean(); // phpcs:ignore
    }

    /**
     * Render form container opening tag
     *
     * @since 2.3
     */
    public function render_form_container_open() {
        // phpcs:disable WordPress.Security.EscapeOutput
        $html  = "\n<div  ";
        $html .= 'class ="' . esc_attr( $this->get_class( 'form_container' ) ) . '" ';
        $html .= '>';
        echo apply_filters( $this->prefix . 'form_container_open_tag', $html, $this->form_attributes );
    }

    /**
     * Render form container closing tag
     *
     * @since 2.3
     */
    public function render_form_container_close() {

        echo apply_filters( $this->prefix . 'form_container_close_tag', "\n</div>", $this->form_attributes );
    }

    /**
     * Render form opening tag
     *
     * @since 2.3
     */
    public function render_form_open() {

        $html = "\n<form  ";
        foreach ( $this->form_attributes as $key  => $value ) {
            $html .= $key . '="' . $value . '" ';
        }
        $html .= ' >';
        echo apply_filters( $this->prefix . 'form_open_tag', $html, $this->form_attributes );
    }

    /**
     * Render form closing tag
     *
     * @since 2.3
     */
    public function render_form_close() {

        echo apply_filters( $this->prefix . 'form_close_tag', "\n</form>", $this->form_attributes );
    }

    /**
     * Render all form sections
     *
     * @since 2.3
     */
    private function render_sections() {

        if ( ! empty( $this->form_sections ) ) {
            foreach ( $this->form_sections as $section ) {
                $this->render_section( $section );

            }
        }
    }

    /**
     * Render single form section
     *
     * @param array $section Field section.
     * @since 2.3
     */
    private function render_section( $section ) {

        $section_class = $this->prefix . 'form_section ' . isset( $section['class'] ) ? $section['class'] : '';
        $section_id    = isset( $section['id'] ) ? $section['id'] : '';
        $section_label = isset( $section['label'] ) ? $section['label'] : '';
        $section_help  = isset( $section['help'] ) ? $section['help'] : ''; ?>

        <div id="<?php echo esc_attr( $section_id ); ?>" class="<?php echo esc_attr( $section_class ); ?>" >

            <span class="<?php echo esc_attr( $this->prefix . 'section_label' ); ?>">
                <?php
                    echo esc_attr( $section_label );
                ?>
            </span>

            <span class="<?php echo esc_attr( $this->prefix . 'section_help' ); ?>">
                <?php
                    echo wp_kses_post( $section_help );
                ?>
            </span>

            <div class="<?php echo esc_attr( $this->prefix . 'section_fields' ); ?>">
                <?php
                if ( ! empty( $section['fields'] ) ) {
                    foreach ( $section['fields'] as $field ) {
                        $this->render_field( $field );

                    }
                }
                ?>
            </div>

        </div>
        <?php
    }

    /**
     * Render all form fields based on type
     *
     * @since 2.3
     */
    private function render_fields() {

        if ( ! empty( $this->form_fields ) ) {
            foreach ( $this->form_fields as $field ) {
                $this->render_field( $field );

            }
        }
    }

    /**
     * Render single form field
     *
     * @param array $field Field array.
     * @since 2.3
     */
    private function render_field( $field ) {

        $this->render_field_container_open();
        $this->render_field_label( $field );

        switch ( $field['type'] ) {

            case 'text':
            case 'url':
            case 'number':
            case 'tel':
            case 'hidden':
                $this->render_text( $field );
                break;
            case 'textarea':
                $this->render_textarea( $field );
                break;
            case 'radio':
                $this->render_radio( $field );
                break;
            case 'select':
            case 'select_single':
                $this->render_select( $field );
                break;
            case 'checkbox':
            case 'checkbox_single':
                $this->render_checkbox( $field );
                break;
            case 'wp_editor':
                $this->render_wp_editor( $field );
                break;

            default:
                $this->render_text( $field );
                break;

        }
        $this->render_field_container_close();
    }

    /**
     * Render field container opening tag
     *
     * @since 2.3
     */
    public function render_field_container_open() {

        $html  = "\n<div  ";
        $html .= 'class ="' . $this->get_class( 'field_container' ) . '" ';
        $html .= '>';
        echo apply_filters( $this->prefix . 'field_container_open_tag', $html, $this->form_attributes );
    }

    /**
     * Render field container closing tag
     *
     * @since 2.3
     */
    public function render_field_container_close() {

        echo apply_filters( $this->prefix . 'field_container_close_tag', "\n</div>", $this->form_attributes );
    }

    /**
     * Render field label
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    public function render_field_label( $field = array() ) {

        $wrapper  = "\n<span  ";
        $wrapper .= 'class ="' . $this->get_class( 'label_container', $field ) . '" ';
        $wrapper .= '>';

        if ( isset( $field['label'] ) ) {

            $html     = "\n<label  ";
            $html    .= 'class ="' . $this->get_class( 'label', $field ) . '" ';
            $html    .= '>';
            $html    .= apply_filters( $this->prefix . 'field_label', $field['label'], $field );
            $html    .= "\n</label>";
            $wrapper .= $html;
        }

        $wrapper .= "\n</span>";

        echo apply_filters( $this->prefix . 'field_label_html', $wrapper, $field );
    }

    /**
     * Render text & similar fields
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_text( $field ) {

        $field['value'] = esc_attr( stripslashes( $this->get_value( $field ) ) );
        $field['class'] = $this->get_class( 'field', $field );
        $html           = "\n<input  ";
        $html          .= $this->get_attributes( $field );
        $html          .= ' />';
        echo apply_filters( $this->prefix . 'form_' . $field['type'] . '_tag', $html, $field );
    }

    /**
     * Render textarea
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_textarea( $field ) {

        $value          = $this->get_value( $field );
        $field['class'] = $this->get_class( 'field', $field );
        $html           = "\n<textarea  ";
        $html          .= $this->get_attributes( $field );
        $html          .= '>';
        $html          .= esc_attr( $value );
        $html          .= '</textarea>';
        echo apply_filters( $this->prefix . 'form_' . $field['type'] . '_tag', $html, $field );

    }

    /**
     * Render radio
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_radio( $field ) {

        $options = $field['opts'];
        $value   = $this->get_value( $field );

        unset( $field['opts'] );

        foreach ( $options as $option => $label ) {

            if ( $option === $value ) {
                $field['checked'] = 'checked';
            }

            $field['value'] = esc_attr( stripslashes( $option ) );
            $field['class'] = $this->get_class( 'field', $field );
            $html           = "\n<input  ";
            $html          .= $this->get_attributes( $field );
            $html          .= ' >' . $label;
            echo apply_filters( $this->prefix . 'form_' . $field['type'] . '_tag', $html, $field );
            unset( $field['checked'] );
        }
    }

    /**
     * Render checkbox
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_checkbox( $field ) {

        $options = $field['opts'];
        $value   = $this->get_value( $field );

        unset( $field['opts'] );

        foreach ( $options as $option => $label ) {

            if ( $option === $value ) {
                $field['checked'] = 'checked';
            }

            $field['value'] = esc_attr( stripslashes( $option ) );
            $field['class'] = $this->get_class( 'field', $field );
            $html           = "\n<input  ";
            $html          .= $this->get_attributes( $field );
            $html          .= ' >' . $label;
            echo apply_filters( $this->prefix . 'form_' . $field['type'] . '_tag', $html, $field );
            unset( $field['checked'] );
        }
    }

    /**
     * Render Editior
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_wp_editor( $field ) {
        $value          = stripslashes( $this->get_value( $field ) );
        $field['class'] = $this->get_class( 'field', $field );
        wp_editor( $value, $field['name'] );
    }

    /**
     * Render select
     *
     * @param array $field Fields array.
     * @since 2.3
     */
    private function render_select( $field ) {
        global $post;
        $options = $field['opts'];
        unset( $field['opts'] );

        $value          = $this->get_value( $field );
        $field['class'] = $this->get_class( 'field', $field );
        $html           = "\n<select  ";
        $html          .= $this->get_attributes( $field );
        $html          .= ' >';
        $value          = (array) $value;
        $value          = array_map( 'sanitize_text_field', $value );

        foreach ( $options as $option => $label ) {

            if ( is_array( $label ) ) {
                if ( isset( $label['exclude'] ) && ! empty( $label['exclude'] ) ) {
                    if ( in_array( $post->post_type, $label['exclude'], true ) ) {
                        continue;
                    }
                }

                if ( isset( $label['include'] ) && ! empty( $label['include'] ) ) {
                    if ( ! in_array( $post->post_type, $label['include'], true ) ) {
                        continue;
                    }
                }
                $label = $label['label'];
            }
            $html .= "\n<option  ";
            $html .= 'value = "' . stripslashes( $option ) . '"';

            if ( in_array( $option, $value, true ) ) {
                $html .= ' selected = "selected" ';
            }

            $html .= ' >' . $label . "\n</option>";

        }
        $html .= "\n</select>";
        echo apply_filters( $this->prefix . 'form_' . $field['type'] . '_tag', $html, $field );
    }

    /**
     * Render nonce field
     *
     * @param string $action Action name.
     * @since 2.3
     */
    public function add_nonce( $action = '' ) {

        $this->has_nonce   = true;
        $this->nonce_key   = ! empty( $action ) ? $action : $this->prefix . 'nonce_action';
        $this->nonce_value = wp_create_nonce( $action );

        $this->add_field(
            array(
                'type'  => 'hidden',
                'name'  => $this->nonce_key,
                'value' => $this->nonce_value,
            )
        );
    }
}