<?php
/**
 * Plugin Name: CGPT-Contact-Form
 * Description: A simple contact form plugin for WordPress written with ChatGPT.
 * Version: 1.0 |  Shorcode: '
Name:Email:Phone Number:Message:
'
 * Author: CASTLE & Chat GPT
 * Author URI: https://castle.com.bd/
 **/

// Add the shortcode 
Name:Email:Phone Number:Message:
 to display the contact form.
add_shortcode( 'my_contact_form', 'my_contact_form_shortcode' );

// Define the my_contact_form_shortcode() function.
function my_contact_form_shortcode() {
    // Check if the form was submitted.
    if ( isset( $_POST['my_contact_form_submit'] ) ) {
        // Verify the captcha.
        $secret_key = 'your_secret_key'; // Replace with your own secret key.
        $response   = $_POST['g-recaptcha-response'];
        $verify_url = 'https://www.google.com/recaptcha/api/siteverify';
        $verify     = wp_remote_post( $verify_url, array(
            'body' => array(
                'secret'   => $secret_key,
                'response' => $response
            )
        ) );
        $verify     = json_decode( $verify['body'] );
        
        if ( $verify->success ) {
            // Sanitize the user input.
            $name         = sanitize_text_field( $_POST['my_contact_form_name'] );
            $email        = sanitize_email( $_POST['my_contact_form_email'] );
            $phone_number = sanitize_text_field( $_POST['my_contact_form_phone_number'] );
            $message      = sanitize_textarea_field( $_POST['my_contact_form_message'] );
            
            // Send the email.
            $to      = get_option( 'admin_email' );
            $subject = 'New contact form submission';
            $body    = "Name: $name\nEmail: $email\nPhone Number: $phone_number\nMessage:\n$message";
            $headers = array( 'Content-Type: text/html; charset=UTF-8' );
            wp_mail( $to, $subject, $body, $headers );
            
            // Redirect to the thank you page.
            wp_redirect( 'https://castle.com.bd/thank-you/' );
            exit;
        } else {
            // Display an error message if the captcha is invalid.
            $output = '<div class="my-contact-form-error">';
            $output .= '<p>The captcha is invalid. Please try again.</p>';
            $output .= '</div>';
        }
    } else {
        // Display the contact form.
        $output = '<div class="my-contact-form">';
        $output .= '<form method="post">';
        $output .= '<label for="my_contact_form_name">Name:</label>';
        $output .= '<input type="text" name="my_contact_form_name" required>';
        $output .= '<label for="my_contact_form_email">Email:</label>';
        $output .= '<input type="email" name="my_contact_form_email" required>';
        $output .= '<label for="my_contact_form_phone_number">Phone Number:</label>';
        $output .= '<input type="text" name="my_contact_form_phone_number" required>';
        $output .= '<label for="my_contact_form_message">Message:</label>';
        $output .= '<textarea name="my_contact_form_message" required></textarea>';
        $output .= '<div class="g-recaptcha" data-sitekey="your_site_key"></div>'; // Replace with your own site key.
        $output .= '<input type="submit" name="my_contact_form_submit" value="Submit">';
       
        $output .= '</form>';
        $output .= '</div>';
    }
    return $output;
}

// Add the CSS styles for the contact form.
add_action( 'wp_enqueue_scripts', 'my_contact_form_styles' );

// Define the my_contact_form_styles() function.
function my_contact_form_styles() {
    wp_enqueue_style( 'my-contact-form-styles', plugins_url( 'css/my-contact-form.css', __FILE__ ) );
}

// Add the JavaScript for the Google reCAPTCHA.
add_action( 'wp_enqueue_scripts', 'my_contact_form_scripts' );

// Define the my_contact_form_scripts() function.
function my_contact_form_scripts() {
    wp_enqueue_script( 'google-recaptcha', 'https://www.google.com/recaptcha/api.js' );
}

// Change the WORDPRESS default email sender address.
add_filter( 'wp_mail_from', function ( $original_email_address ) {
return 'no-id@castle.com.bd';
} );

// Change the From name.
add_filter( 'wp_mail_from_name', function ( $original_email_from ) {
return 'CASTLE.COM.BD';
} );