<?php

/**
 * The ajax handler class
 */
class WeForms_Ajax {

    public function __construct() {

        // backend requests
        add_action( 'wp_ajax_weforms_form_list', array( $this, 'get_contact_forms' ) );
        add_action( 'wp_ajax_weforms_form_names', array( $this, 'get_contact_form_names' ) );
        add_action( 'wp_ajax_weforms_form_create', array( $this, 'create_form' ) );
        add_action( 'wp_ajax_weforms_form_delete', array( $this, 'delete_form' ) );
        add_action( 'wp_ajax_weforms_form_delete_bulk', array( $this, 'delete_form_bulk' ) );
        add_action( 'wp_ajax_weforms_form_duplicate', array( $this, 'duplicate_form' ) );

        // create from a template
        add_filter( 'wp_ajax_weforms_contact_form_template', array( $this, 'create_form_from_template' ) );

        // form settings
        add_action( 'wp_ajax_weforms_save_settings', array( $this, 'save_settings' ) );
        add_action( 'wp_ajax_weforms_get_settings', array( $this, 'get_settings' ) );

        // import
        add_action( 'wp_ajax_weforms_import_form', array( $this, 'import_form' ) );

        // form editing
        add_action( 'wp_ajax_weforms_get_form', array( $this, 'get_form' ) );
        add_action( 'wp_ajax_wpuf_form_builder_save_form', array( $this, 'save_form' ) );

        // entries
        add_action( 'wp_ajax_weforms_form_entries', array( $this, 'get_entries' ) );
        add_action( 'wp_ajax_weforms_form_entry_details', array( $this, 'get_entry_detail' ) );
        add_action( 'wp_ajax_weforms_form_entry_trash', array( $this, 'trash_entry' ) );
        add_action( 'wp_ajax_weforms_form_entry_trash_bulk', array( $this, 'bulk_delete_entry' ) );

        // frontend requests
        add_action( 'wp_ajax_weforms_frontend_submit', array( $this, 'handle_frontend_submission' ) );
        add_action( 'wp_ajax_nopriv_weforms_frontend_submit', array( $this, 'handle_frontend_submission' ) );
    }

    /**
     * Administrator validation
     *
     * @return void
     */
    public function check_admin() {
        if ( !current_user_can( weforms_form_access_capability() ) ) {
            wp_send_json_error( __( 'You do not have sufficient permission.', 'weforms' ) );
        }
    }

    /**
     * Get a form to edit
     *
     * @return void
     */
    public function get_form() {

        $this->check_admin();

        $form_id = isset( $_REQUEST['form_id'] ) ? absint( $_REQUEST['form_id'] ) : 0;

        $form = weforms()->form->get( $form_id );

        $data = array(
            'post'          => $form->data,
            'form_fields'   => $form->get_fields(),
            'settings'      => $form->get_settings(),
            'notifications' => $form->get_notifications(),
            'integrations'  => $form->get_integrations()
        );

        wp_send_json_success( $data );
    }

    /**
     * Save the form
     *
     * @return void
     */
    public function save_form() {
        parse_str( $_POST['form_data'], $form_data );

        if ( ! wp_verify_nonce( $form_data['wpuf_form_builder_nonce'], 'wpuf_form_builder_save_form' ) ) {
            wp_send_json_error( __( 'Unauthorized operation', 'wpuf' ) );
        }

        if ( empty( $form_data['wpuf_form_id'] ) ) {
            wp_send_json_error( __( 'Invalid form id', 'wpuf' ) );
        }

        $form_fields   = isset( $_POST['form_fields'] ) ? $_POST['form_fields'] : '';
        $notifications = isset( $_POST['notifications'] ) ? $_POST['notifications'] : '';
        $settings      = array();
        $integrations  = array();

        if ( isset( $_POST['settings'] ) ) {
            $settings = (array) json_decode( wp_unslash( $_POST['settings'] ) );
        } else {
            $settings = isset( $form_data['wpuf_settings'] ) ? $form_data['wpuf_settings'] : array();
        }

        if ( isset( $_POST['integrations'] ) ) {
            $integrations = (array) json_decode( wp_unslash( $_POST['integrations'] ) );
        }

        $form_fields   = wp_unslash( $form_fields );
        $notifications = wp_unslash( $notifications );

        $form_fields   = json_decode( $form_fields, true );
        $notifications = json_decode( $notifications, true );

        $data = array(
            'form_id'           => absint( $form_data['wpuf_form_id'] ),
            'post_title'        => sanitize_text_field( $form_data['post_title'] ),
            'form_fields'       => $form_fields,
            'form_settings'     => $settings,
            'form_settings_key' => isset( $form_data['form_settings_key'] ) ? $form_data['form_settings_key'] : '',
            'notifications'     => $notifications,
            'integrations'      => $integrations
        );

        $form_fields = weforms()->form->save( $data );

        wp_send_json_success( array( 'form_fields' => $form_fields ) );
    }

    /**
     * Get all contact forms
     *
     * @return void
     */
    public function get_contact_forms() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $args = array(
            'posts_per_page' => 10,
            'paged'          => isset( $_POST['page'] ) ? absint( $_POST['page'] ) : 1,
            'order'          => 'DESC',
            'orderby'        => 'post_date'
        );

        $contact_forms = weforms()->form->get_forms( $args );

        array_map( function($form) {
            $form->entries = $form->num_form_entries();
            $form->views   = $form->num_form_views();
        }, $contact_forms['forms'] );

        $contact_forms = apply_filters( 'weforms_ajax_get_contact_forms', $contact_forms );

        wp_send_json_success( $contact_forms );
    }

    /**
     * Get the names of contact forms for generating dropdown
     *
     * @return void
     */
    public function get_contact_form_names() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $contact_forms = weforms()->form->all();
        $response      = array();

        foreach ($contact_forms['forms'] as $form) {
            $response[] = array(
                'id'    => $form->get_id(),
                'title' => $form->get_name() . ' (#' . $form->get_id() . ')'
            );
        }

        wp_send_json_success( $response );
    }

    /**
     * Create a form
     *
     * @return void
     */
    public function create_form() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_name = isset( $_POST['form_name'] ) ? sanitize_text_field( $_POST['form_name'] ) : '';

        if ( empty( $form_name ) ) {
            wp_send_json_error( __( 'Please provide a form name', 'weforms' ) );
        }

        $form_id = weforms()->form->create( $form_name );

        if ( is_wp_error( $form_id )) {
            wp_send_json_error( $form_id->get_error_message() );
        }

        wp_send_json_success( array(
            'form_id'   => $form_id,
            'form_name' => $form_name
        ) );
    }

    /**
     * Delete a form
     *
     * @return void
     */
    public function delete_form() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_id = isset( $_POST['form_id'] ) ? intval( $_POST['form_id'] ) : 0;

        if ( ! $form_id ) {
            wp_send_json_error( __( 'No form id provided!', 'weforms' ) );
        }

        weforms()->form->delete( $form_id );

        wp_send_json_success();
    }

    public function delete_form_bulk() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_ids = isset( $_POST['ids'] ) ? array_map( 'absint', $_POST['ids'] ) : array();

        if ( ! $form_ids ) {
            wp_send_json_error( __( 'No form ids provided!', 'weforms' ) );
        }

        foreach ($form_ids as $form_id) {
            weforms()->form->delete( $form_id );
        }

        wp_send_json_success();
    }

    /**
     * Duplicate a form
     *
     * @return voiud
     */
    public function duplicate_form() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_id = isset( $_POST['form_id'] ) ? intval( $_POST['form_id'] ) : 0;

        $form = weforms()->form->duplicate( $form_id );

        wp_send_json_success( $form );
    }

    /**
     * Create form from a template
     *
     * @return void
     */
    public function create_form_from_template() {
        check_ajax_referer( 'weforms' );

        $template = isset( $_REQUEST['template'] ) ? sanitize_text_field( $_REQUEST['template'] ) : '';

        $form_id = weforms()->templates->create( $template );

        if ( is_wp_error( $form_id ) ) {
            wp_send_json_error( __( 'Could not create the form', 'weforms' ) );
        }

        wp_send_json_success( array(
            'id' => $form_id
        ) );
    }

    /**
     * Save the weForms settings
     *
     * @return void
     */
    public function save_settings() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $requires_wpuf_update = false;
        $wpuf_update_array    = array();
        $settings             = (array) json_decode( wp_unslash( $_POST['settings'] ) );

        update_option( 'weforms_settings', $settings );

        // wpuf settings sync
        if ( isset( $settings['gmap_api'] ) ) {
            $requires_wpuf_update = true;
            $wpuf_update_array['gmap_api_key'] = $settings['gmap_api'];
        }

        if ( isset( $settings['recaptcha'] ) ) {
            $requires_wpuf_update                   = true;
            $wpuf_update_array['recaptcha_public']  = $settings['recaptcha']->key;
            $wpuf_update_array['recaptcha_private'] = $settings['recaptcha']->secret;
        }

        if ( $requires_wpuf_update ) {
            $wpuf_settings = get_option( 'wpuf_general', array() );

            $wpuf_settings = array_merge( $wpuf_settings, $wpuf_update_array );
            update_option( 'wpuf_general', $wpuf_settings );
        }

        do_action( 'weforms_save_settings', $settings );

        wp_send_json_success( $settings );
    }

    /**
     * Get the weForms Settings
     *
     * @return void
     */
    public function get_settings() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $settings = weforms_get_settings();

        // checking to prevent js error, will be removed in future
        if ( ! isset( $settings['credit'] ) ) {
            $settings['credit'] = false;
        }

        if ( ! isset( $settings['permission'] ) ) {
            $settings['permission'] = 'manage_options';
        }

        wp_send_json_success( $settings );
    }

    /**
     * Get all entries
     *
     * @return void
     */
    public function get_entries() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_id      = isset( $_REQUEST['id'] ) ? intval( $_REQUEST['id'] ) : 0;
        $current_page = isset( $_REQUEST['page'] ) ? intval( $_REQUEST['page'] ) : 1;
        $per_page     = 20;
        $offset       = ( $current_page - 1 ) * $per_page;

        if ( ! $form_id ) {
            wp_send_json_error( __( 'No form id provided!', 'weforms' ) );
        }

        $entries = weforms_get_form_entries( $form_id, array(
            'number' => $per_page,
            'offset' => $offset
        ) );

        $columns       = weforms_get_entry_columns( $form_id );
        $total_entries = weforms_count_form_entries( $form_id );

        array_map( function( $entry ) use ($columns) {
            $entry_id = $entry->id;
            $entry->fields = array();

            foreach ($columns as $meta_key => $label) {
                $value                    = weforms_get_entry_meta( $entry_id, $meta_key, true );
                $entry->fields[$meta_key] = str_replace( WeForms::$field_separator, ' ', $value );
            }
        }, $entries );

        $entries = apply_filters('weforms_get_entries', $entries, $form_id );

        $response = array(
            'columns'    => $columns,
            'entries'    => $entries,
            'form_title' => get_post_field( 'post_title', $form_id ),
            'pagination' => array(
                'total'    => $total_entries,
                'per_page' => $per_page,
                'pages'    => ceil( $total_entries / $per_page ),
                'current'  => $current_page
            )
        );

        wp_send_json_success( $response );
    }

    /**
     * Get an entry details
     *
     * @return void
     */
    public function get_entry_detail() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $form_id  = isset( $_REQUEST['form_id'] ) ? intval( $_REQUEST['form_id'] ) : 0;
        $entry_id = isset( $_REQUEST['entry_id'] ) ? intval( $_REQUEST['entry_id'] ) : 0;

        $form     = weforms()->form->get( $form_id );
        $entry    = $form->entries()->get( $entry_id );
        $fields   = $entry->get_fields();
        $metadata = $entry->get_metadata();

        if ( false === $data ) {
            wp_send_json_error( __( 'No form fields found!', 'weforms' ) );
        }

        $response = array(
            'form_fields' => $fields,
            'meta_data'   => $metadata
        );

        wp_send_json_success( $response );
    }

    /**
     * Trash an entry
     *
     * @return void
     */
    public function trash_entry() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $entry_id = isset( $_REQUEST['entry_id'] ) ? intval( $_REQUEST['entry_id'] ) : 0;

        weforms_change_entry_status( $entry_id, 'trash' );
        wp_send_json_success();
    }

    /**
     * Bulk trash entries
     *
     * @return void
     */
    public function bulk_delete_entry() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $entry_ids = isset( $_POST['ids'] ) ? array_map( 'absint', $_POST['ids'] ) : array();

        if ( ! $entry_ids ) {
            wp_send_json_error( __( 'No entry ids provided!', 'weforms' ) );
        }

        foreach ($entry_ids as $entry_id) {
            weforms_change_entry_status( $entry_id, 'trash' );
        }

        wp_send_json_success();
    }

    /**
     * Handle the frontend submission
     *
     * @return void
     */
    public function handle_frontend_submission() {
        check_ajax_referer( 'wpuf_form_add' );

        $form_id       = isset( $_POST['form_id'] ) ? intval( $_POST['form_id'] ) : 0;
        $page_id       = isset( $_POST['page_id'] ) ? intval( $_POST['page_id'] ) : 0;

        $form          = weforms()->form->get( $form_id );
        $form_fields   = $form->get_fields();
        $entry_fields  = $form->prepare_entries();
        $form_settings = $form->get_settings();

        if ( !$form_fields ) {
            wp_send_json( array(
                'success'     => false,
                'error'       => __( 'No form field was found.', 'weforms' ),
            ) );
        }

        if ( $form->has_field( 'recaptcha' ) ) {
            $this->validate_reCaptcha();
        }

        $entry_id = weforms_insert_entry( array(
            'form_id' => $form_id
        ), $entry_fields );

        if ( is_wp_error( $entry_id ) ) {
            wp_send_json( array(
                'success'     => false,
                'error'       => $entry_id->get_error_message(),
            ) );
        }

        // redirect URL
        $show_message = false;
        $redirect_to  = false;

        if ( $form_settings['redirect_to'] == 'page' ) {
            $redirect_to = get_permalink( $form_settings['page_id'] );
        } elseif ( $form_settings['redirect_to'] == 'url' ) {
            $redirect_to = $form_settings['url'];
        } elseif ( $form_settings['redirect_to'] == 'same' ) {
            $show_message = true;
        } else {
            $redirect_to = get_permalink( $post_id );
        }

        // Fire a hook for integration
        do_action( 'weforms_entry_submission', $entry_id, $form_id, $page_id, $form_settings );

        // send the response
        $response = array(
            'success'      => true,
            'redirect_to'  => $redirect_to,
            'show_message' => $show_message,
            'message'      => $form_settings['message'],
            'data'         => $_POST
        );

        $notification = new WeForms_Notification( array(
            'form_id'  => $form_id,
            'page_id'  => $page_id,
            'entry_id' => $entry_id
        ) );

        $notification->send_notifications();

        weforms_clear_buffer();
        wp_send_json( $response );
    }

    /**
     * reCaptcha Validation
     *
     * @return void
     */
    function validate_reCaptcha() {

        // add reCaptcha library if not found
        if ( !function_exists( 'recaptcha_get_html' ) ) {
            require_once WEFORMS_INCLUDES . '/library/reCaptcha/recaptchalib.php';
            require_once WEFORMS_INCLUDES . '/library/reCaptcha/recaptchalib_noCaptcha.php';
        }


        $invisible = isset( $_POST["g-recaptcha-response"] ) ? false : true;

        $recaptcha_settings = weforms_get_settings( 'recaptcha' );
        $secret             = isset( $recaptcha_settings->secret ) ? $recaptcha_settings->secret : '';

        if ( ! $invisible ) {

            $response = null;
            $reCaptcha = new ReCaptcha($secret);

            $resp = $reCaptcha->verifyResponse(
                $_SERVER["REMOTE_ADDR"],
                $_POST["g-recaptcha-response"]
            );

            if ( !$resp->success ) {
                wp_send_json( array(
                    'success'     => false,
                    'error'       => __( 'reCAPTCHA validation failed', 'wpuf' ),
                ) );
            }

        } else {

            $recap_challenge = isset( $_POST['recaptcha_challenge_field'] ) ? $_POST['recaptcha_challenge_field'] : '';
            $recap_response  = isset( $_POST['recaptcha_response_field'] ) ? $_POST['recaptcha_response_field'] : '';

            $resp            = recaptcha_check_answer( $secret, $_SERVER["REMOTE_ADDR"], $recap_challenge, $recap_response );

            if ( !$resp->is_valid ) {
                wp_send_json( array(
                    'success'     => false,
                    'error'       => __( 'reCAPTCHA validation failed', 'wpuf' ),
                ) );
            }
        }

    }

    public static function prepare_meta_fields( $meta_vars ) {
        // loop through custom fields
        // skip files, put in a key => value paired array for later executation
        // process repeatable fields separately
        // if the input is array type, implode with separator in a field

        $files          = array();
        $meta_key_value = array();
        $multi_repeated = array(); //multi repeated fields will in sotre duplicated meta key

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

            switch ( $value['template'] ) {

                // put files in a separate array, we'll process it later
                case 'file_upload':
                case 'image_upload':

                    $files[] = array(
                        'name'  => $value['name'],
                        'value' => isset( $_POST['wpuf_files'][$value['name']] ) ? $_POST['wpuf_files'][$value['name']] : array(),
                        'count' => $value['count']
                    );
                    break;

                case 'repeat_field':

                    // if it is a multi column repeat field
                    if ( isset( $value['multiple'] ) && $value['multiple'] == 'true' ) {

                        // if there's any items in the array, process it
                        if ( $_POST[$value['name']] ) {

                            $ref_arr = array();
                            $cols    = count( $value['columns'] );
                            $first   = array_shift( array_values( $_POST[$value['name']] ) ); //first element
                            $rows    = count( $first );

                            // loop through columns
                            for ($i = 0; $i < $rows; $i++) {

                                // loop through the rows and store in a temp array
                                $temp = array();
                                for ($j = 0; $j < $cols; $j++) {

                                    $temp[] = $_POST[$value['name']][$j][$i];
                                }

                                // store all fields in a row with WeForms::$field_separator separated
                                $ref_arr[] = implode( WeForms::$field_separator, $temp );
                            }

                            // now, if we found anything in $ref_arr, store to $multi_repeated
                            if ( $ref_arr ) {
                                $multi_repeated[$value['name']] = array_slice( $ref_arr, 0, $rows );
                            }
                        }
                    } else {
                        $meta_key_value[$value['name']] = implode( WeForms::$field_separator, $_POST[$value['name']] );
                    }

                    break;

                case 'address_field':

                    if ( isset( $_POST[ $value['name'] ] ) && is_array( $_POST[ $value['name'] ] ) ) {
                        foreach ( $_POST[ $value['name'] ] as $address_field => $field_value ) {
                            $meta_key_value[ $value['name'] ][ $address_field ] = sanitize_text_field( $field_value );
                        }
                    }

                    break;

                case 'text_field':
                case 'email_address':
                case 'numeric_text_field':
                case 'date_field':

                    $meta_key_value[$value['name']] = sanitize_text_field( trim( $_POST[$value['name']] ) );

                    break;

                case 'textarea_field':

                    $meta_key_value[$value['name']] = wp_kses_post( $_POST[$value['name']] );

                    break;

                case 'dropdown_field':
                case 'radio_field':

                    $val                            = $_POST[$value['name']];
                    $meta_key_value[$value['name']] = isset( $value['options'][$val] ) ? $value['options'][$val] : '';
                    break;

                case 'multiple_select':
                case 'checkbox_field':

                    $val                            = ( is_array( $_POST[$value['name']] ) && $_POST[$value['name']] ) ? $_POST[$value['name']] : array();
                    $meta_key_value[$value['name']] = $val;

                    if ( $val ) {
                        $new_val = array();

                        foreach ($val as $option_key) {
                            $new_val[] = isset( $value['options'][$option_key] ) ? $value['options'][$option_key] : '';
                        }

                        $meta_key_value[$value['name']] = implode( WeForms::$field_separator, $new_val );
                    }
                    break;

                default:
                    // if it's an array, implode with this->separator
                    if ( is_array( $_POST[$value['name']] ) ) {

                        $meta_key_value[$value['name']] = implode( WeForms::$field_separator, $_POST[$value['name']] );

                    } else {
                        $meta_key_value[$value['name']] = trim( $_POST[$value['name']] );
                    }

                    break;
            }

        } //end foreach

        return array($meta_key_value, $multi_repeated, $files);
    }

    /**
     * Import a form from a JSON file
     *
     * @return void
     */
    public function import_form() {
        check_ajax_referer( 'weforms' );

        $this->check_admin();

        $the_file = isset( $_FILES['importFile'] ) ? $_FILES['importFile'] : false;

        if ( ! $the_file ) {
            wp_send_json_error( __( 'No file found to import.', 'weforms' ) );
        }

        $file_ext  = pathinfo( $the_file['name'], PATHINFO_EXTENSION );

        if ( ! class_exists( 'WeForms_Admin_Tools' ) ) {
            require_once dirname( __FILE__ ) . '/admin/class-admin-tools.php';
        }

        if ( ( $file_ext == 'json' ) && ( $the_file['size'] < 500000 ) ) {

            $status = WeForms_Admin_Tools::import_json_file( $the_file['tmp_name'] );

            if ( $status ) {
                wp_send_json_success( __( 'The forms have been imported successfully!', 'weforms' ) );
            } else {
                wp_send_json_error( __( 'Something went wrong importing the file.', 'weforms' ) );
            }

        } else {
            wp_send_json_error( __( 'Invalid file or file size too big.', 'weforms' ) );
        }
    }

}