<?php
/*
Plugin Name: Ajax Send Message
Version: 0.1
License: GPLv2
*/

/**
 * Ajax Send Message class
 */
class Ajax_send_message {

    /**
     * Constructor
     * @return void
     */
    public function __construct() {

        add_filter( 'the_content', array( $this, 'message_form' ), 10, 1 );

        add_action( 'wp_enqueue_scripts', array( $this, 'scripts' ) );

        add_action( 'wp_ajax_nopriv_send_message', array( $this, 'send_message' ) );
        add_action( 'wp_ajax_send_message', array( $this, 'send_message' ) );

    }

    /**
     * Adds the message form to the end of posts content
     * @param  string $content post content
     * @return string content with form
     */
    public function message_form( $content ) {

        // display only on posts
        if ( ! is_single() ) {
            return $content;
        }

        $nonce = wp_create_nonce( 'ajax_send_message' );
    global $current_user;
        $content .= '<div class="send-a-message-box">';
    if( !is_user_logged_in() ){
      $content .= '<input type="text" class="send-a-message-display-name" placeholder="' . __( 'Enter Your name', 'ajaxsendmessage' ) . '">';
    } else{
      $content .= '<div>Podpis: '.$current_user->display_name.' <a href="'.wp_logout_url(get_permalink()).'">'. __('Logout').'</a></div>';
    }

        $content .= '<textarea class="send-a-message-msg" placeholder="' . __( 'Enter Your message', 'ajaxsendmessage' ) . '"></textarea>
            <button class="send-message" data-nonce="' . $nonce . '">' .
                            __( 'Send message', 'ajaxsendmessage' ) .
                        '</button>
                        <p class="send-a-message-response"></p>
                    </div>';

        return $content;

    }

    /**
     * Enqueue plugin scripts
     * @return void
     */
    function scripts() {

        wp_enqueue_style( 'send-a-message', plugin_dir_url( __FILE__ ) . 'css/style.css' );

        wp_enqueue_script( 'send-a-message', plugin_dir_url( __FILE__ ) . 'js/scripts.js', array( 'jquery' ), null, true );

        // set variables for script
        wp_localize_script( 'send-a-message', 'settings', array(
            'ajaxurl'    => admin_url( 'admin-ajax.php' ),
            'send_label' => __( 'Send message', 'ajaxsendmessage' ),
            'error'      => __( 'Sorry, something goes wrong. Please try again', 'ajaxsendmessage' )
        ) );

    }
    /**
     * Sends message to database
     * @return void
     */
    function send_message() {

        $data = $_POST;

        // check the nonce
        if ( check_ajax_referer( 'ajax_send_message', 'nonce', false ) == false ) {
        wp_send_json_error();
      }

    $insert = array(
      'msg_date' => date('Y-m-d H:i:s'),
      'msg_body' => sanitize_text_field( $data['msg'] ),
      'msg_status' => 0,
      'ip' => $_SERVER['REMOTE_ADDR'],
);

  if( !is_user_logged_in() ) {
    $insert['member_name'] = sanitize_text_field( $data['user_name'] );
    $insert['member_id']=55;
  } else {
    global $current_user;
    $insert['member_name'] = $current_user->display_name;
    $insert['member_id'] = $current_user->ID;
  }

    global $wpdb;
        $table = $wpdb->prefix .'asm_msgs';


    $result = $wpdb->insert( $table, $insert);

        if ( $result ) {
            wp_send_json_success( __( 'Thanks for your message!', 'ajaxsendmessage' ) );
        }
   else {
        wp_send_json_error($wpdb->last_error,'ajaxsendmessage');
}

    }

}

new Ajax_send_message();