<?php

namespace Adminz\Controller;

final class Mailer {
    private static $instance = null;
    public $id = 'adminz_mailer';
    public $name = 'Mailer SMTP';
    public $option_name = 'adminz_mailer';

    public $settings = [];

    public static function get_instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    function __construct() {
        add_filter('adminz_option_page_nav', [$this, 'add_admin_nav'], 10, 1);
        add_action('admin_init', [$this, 'register_settings']);
        add_action('admin_init', [$this, 'process_smtp_passwork_fake']);
        $this->load_settings();
        $this->run();
        add_filter('pre_wp_mail', [$this, 'pre_wp_mail'], 10, 2);
        add_action('wp_ajax_adminz_test_email', [$this, 'adminz_test_email'], 10, 2);
    }

    function run() {
        // 
        if ($this->settings['email_to_fixed'] ?? '') {
            add_filter('wp_mail', function ($atts) {
                $atts['to'] = $this->settings['email_to_fixed'];
                return $atts;
            });
        }

        // 
        if (($this->settings['email_wp_cron'] ?? '') == 'on') {

            add_filter('pre_wp_mail', function ($return, $args) {
                $transient_key = "adminz_" . md5($args['to'] . $args['subject'] . $args['message'] . implode('', (array) $args['attachments']));

                if (!get_transient($transient_key)) {
                    wp_schedule_single_event(time() + 15, 'adminz_schedule_email', [$args]);
                    set_transient($transient_key, true, 3600);
                    return true;
                }

                return $return;
            }, 10, 2);

            add_action('adminz_schedule_email', function ($args) {
                wp_mail(
                    $args['to'],
                    $args['subject'],
                    $args['message'],
                    $args['headers'],
                    $args['attachments']
                );

                $transient_key = "adminz_" . md5($args['to'] . $args['subject'] . $args['message'] . implode('', (array) $args['attachments']));
                error_log($transient_key);
                set_transient($transient_key, true, 3600);
            });
        }
    }

    function process_smtp_passwork_fake() {

        // check admin page
        if (($_POST['option_page'] ?? '') !== 'adminz_mailer') {
            return;
        }

        // check if password is filled anything then update password encoded
        if ($password = ($_POST['adminz_mailer_password_fake'] ?? '')) {
            $password_encoded = $this->encode_openssl_password($password);
            $_POST['adminz_mailer']['adminz_mailer_password_encoded'] = $password_encoded;

            // test 
            // echo "<pre>"; print_r($password); echo "</pre>";
            // echo "<pre>"; print_r($password_encoded); echo "</pre>";
            // $password_decoded = $this->decode_openssl_password($password_encoded);
            // echo "<pre>"; print_r($password_decoded); echo "</pre>";
            // die;
        }
    }

    function get_openssl_key_iv() {
        // $name = get_site_url();
        $raw_url = get_option('siteurl');
        $domain = parse_url($raw_url, PHP_URL_HOST);

        if (empty($domain)) {
            $domain = 'xxx';
        }

        $key = hash('sha256', $domain); // 32 bytes cho AES-256
        $iv = substr(md5($domain), 0, 16); // 16 bytes cho AES-256-CBC
        $return = [$key, $iv];
        return $return;
    }

    function encode_openssl_password($string) {
        list($key, $iv) = $this->get_openssl_key_iv();
        $encrypted = openssl_encrypt($string, 'AES-256-CBC', $key, 0, $iv);
        return base64_encode($encrypted);
    }

    function decode_openssl_password($string) {
        list($key, $iv) = $this->get_openssl_key_iv();
        $decoded = base64_decode($string);
        return openssl_decrypt($decoded, 'AES-256-CBC', $key, 0, $iv);
    }

    // phpmailer settings
    function pre_wp_mail($wp_mail, $atts) {
        if (($this->settings['adminz_mailer_disabled'] ?? "") == 'on') {
            return $wp_mail;
        }

        if (!($this->settings['adminz_mailer_host'] ?? "")) {
            return $wp_mail;
        }

        add_action('phpmailer_init', function ($phpmailer) {
            if (isset($phpmailer->isSMTP) && $phpmailer->isSMTP()) {
                // Nếu PHPMailer đã được cấu hình bởi plugin khác, không ghi đè
                return;
            }

            $phpmailer->isSMTP();
            $phpmailer->Host = ($this->settings['adminz_mailer_host'] ?? '');
            $phpmailer->SMTPAuth = ($this->settings['adminz_mailer_smtpauth'] ?? '') === 'on';
            $phpmailer->Username = ($this->settings['adminz_mailer_username'] ?? '');
            $phpmailer->SMTPSecure = ($this->settings['adminz_mailer_smtpsecure'] ?? '');
            $phpmailer->Port = ($this->settings['adminz_mailer_port'] ?? '');
            $phpmailer->Password = ($this->settings['adminz_mailer_password'] ?? '');
            // echo '<pre>'; print_r($this->settings); echo '</pre>';die;

            // password encoded
            if ($this->settings['adminz_mailer_password_encoded'] ?? '') {
                $password_encoded = $this->settings['adminz_mailer_password_encoded'] ?? '';
                $password_decoded = $this->decode_openssl_password($password_encoded);

                // test
                // echo "<pre>"; print_r($password_encoded); echo "</pre>";
                // echo "<pre>"; print_r($password_decoded); echo "</pre>";
                // die;

                $phpmailer->Password = $password_decoded;
            }

            if (!empty($this->settings['adminz_mailer_from'])) {
                $phpmailer->setFrom($this->settings['adminz_mailer_from'], $this->settings['adminz_mailer_fromname']);
            }

            if (($this->settings['enable_ssl'] ?? "") == 'on') {
                $phpmailer->SMTPSecure = \PHPMailer\PHPMailer\PHPMailer::ENCRYPTION_STARTTLS;
            }

            // echo "<pre>"; print_r($phpmailer); echo "</pre>";
        }, 10, 1);

        return $wp_mail;
    }

    function adminz_test_email() {
        if (!wp_verify_nonce($_POST['nonce'], 'adminz_js')) exit;
        $return = false;

        ob_start();

        // code here
        if ($email_to = ($_POST['adminz_mailer']['adminz_mailer_test_email_checker'] ?? "")) {
            // override settings from post
            $this->settings = $_POST['adminz_mailer'];

            $email_to = sanitize_email($email_to);
            add_action('phpmailer_init', function ($phpmailer) {
                echo "<pre>";
                print_r("---------------------- PHPMAILER SETUP: --------------------- ");
                echo "</pre>";
                echo "<pre>";
                print_r($phpmailer);
                echo "</pre>";

                echo "<pre>";
                print_r("---------------------- PHPMAILER DEBUG: --------------------- ");
                echo "</pre>";
                // Bật chế độ debug
                $phpmailer->SMTPDebug = 3; // Hoặc 1, 2, 3 tùy mức độ chi tiết bạn muốn
                $phpmailer->Debugoutput = function ($str, $level) {
                    // Ghi thông tin debug vào error_log
                    echo "<pre>";
                    print_r($str);
                    echo "</pre>";
                };
            });


            $result = wp_mail(
                $email_to,
                'Test SMTP email function',
                'OK!'
            );

            echo "<pre>";
            print_r("---------------------- EMAIL SENT STATUS: --------------------- ");
            echo "</pre>";
            var_dump($result);
        }

        $return = ob_get_clean();

        if (!$return) {
            wp_send_json_error('Error');
            wp_die();
        }

        wp_send_json_success($return);
        wp_die();
    }

    // adminz settings
    function load_settings() {
        $this->settings = get_option($this->option_name, []);
    }

    function add_admin_nav($nav) {
        $nav[$this->id] = $this->name;
        return $nav;
    }

    function register_settings() {
        register_setting($this->id, $this->option_name);

        // add section
        add_settings_section(
            'adminz_mailer_test_smtp_config',
            'SMTP config',
            function () {
                // section
            },
            $this->id
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Disable this',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('checkbox')
                    ->name($this->option_name . '[adminz_mailer_disabled]')
                    ->value($this->settings['adminz_mailer_disabled'] ?? '')
                    ->copyButton(true)
                    ->addNote('Keep settings but disable as tempolary')
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Host',
            function () {
                //
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_host]')
                    ->value($this->settings['adminz_mailer_host'] ?? '')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => 'smtp.gmail.com',
                            'class' => 'regular-text'
                        ]
                    )
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'User name',
            function () {
                //
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_username]')
                    ->value($this->settings['adminz_mailer_username'] ?? '')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => 'abc@gmail.com',
                            'class' => 'regular-text'
                        ]
                    )
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Password',
            function () {
                //
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('password')
                    ->name('adminz_mailer_password_fake')
                    ->value('')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => 'Your app password',
                            'class' => 'regular-text'
                        ]
                    )
                    ->addNote(function_exists('openssl_encrypt') ? 'App password is hidden' : '<mark>PHP library openssl is required!</mark>')
                    ->addNote('Encoded and stored in the database based on domain name')
                    ->render();

                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('hidden')
                    ->name($this->option_name . '[adminz_mailer_password_encoded]')
                    ->value($this->settings['adminz_mailer_password_encoded'] ?? '')
                    ->copyButton(true)
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Email from',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_from]')
                    ->value($this->settings['adminz_mailer_from'] ?? '')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => 'abc@gmail.com',
                            'class' => 'regular-text'
                        ]
                    )
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'From name',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_fromname]')
                    ->value($this->settings['adminz_mailer_fromname'] ?? '')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => 'abc@gmail.com',
                            'class' => 'regular-text'
                        ]
                    )
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Port',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_port]')
                    ->value($this->settings['adminz_mailer_port'] ?? '')
                    ->copyButton(true)
                    ->attributes(
                        [
                            'placeholder' => '587',
                            'class' => 'regular-text'
                        ]
                    )
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'SMTPAuth',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('checkbox')
                    ->name($this->option_name . '[adminz_mailer_smtpauth]')
                    ->value($this->settings['adminz_mailer_smtpauth'] ?? '')
                    ->copyButton(true)
                    ->addNote('On')
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'SMTPSecure',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('select')
                    ->name($this->option_name . '[adminz_mailer_smtpsecure]')
                    ->value($this->settings['adminz_mailer_smtpsecure'] ?? '')
                    ->copyButton(true)
                    ->options(
                        [
                            'tls' => 'TLS',
                            'ssl' => 'SSL',
                        ]
                    )
                    ->addNote('Tls')
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Enable SSL Certificate Verification',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('checkbox')
                    ->name($this->option_name . '[enable_ssl]')
                    ->value($this->settings['enable_ssl'] ?? '')
                    ->copyButton(true)
                    ->addNote('Off')
                    ->render();
            },
            $this->id,
            'adminz_mailer_test_smtp_config'
        );

        // add section
        add_settings_section(
            'adminz_mailer_tools',
            'Tools',
            function () {
            },
            $this->id
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Email schedule ',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('checkbox')
                    ->name($this->option_name . '[email_wp_cron]')
                    ->value($this->settings['email_wp_cron'] ?? '')
                    ->copyButton(false)
                    ->addNote('Use plugin: <a target=blank href=https://wordpress.org/plugins/wp-crontrol/>WP Crontrol</a> for more manage email')
                    ->render();
            },
            $this->id,
            'adminz_mailer_tools'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Fixed email to',
            function () {
                //
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[email_to_fixed]')
                    ->attributes(
                        [
                            'autocomplete' => 'new-password',
                            'class' => 'regular-text',
                            'placeholder' => 'abc@gmail.com'
                        ]
                    )
                    ->value($this->settings['email_to_fixed'] ?? '')
                    ->addNote('Every email must be sent to this email')
                    ->render();
            },
            $this->id,
            'adminz_mailer_tools'
        );

        // add section
        add_settings_section(
            'adminz_mailer_test',
            'Test',
            function () {
            },
            $this->id
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Your email checker',
            function () {
                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('text')
                    ->name($this->option_name . '[adminz_mailer_test_email_checker]')
                    ->attributes([
                        'class' => 'adminz_field regular-text email_test',
                        'placeholder' => 'your_email@gmail.com'
                    ])
                    ->value($this->settings['adminz_mailer_test_email_checker'] ?? '')
                    ->render();

                // field
                echo \WpDatabaseHelperV2\Fields\WpField::make()
                    ->kind('input')
                    ->type('button')
                    ->attributes([
                        'class' => ['button', 'button-primary', 'adminz_fetch'],
                        'data-response' => '.adminz_response222',
                        'data-action'   => 'adminz_test_email',
                    ])
                    ->value('Check')
                    ->render();

                echo '<div class="adminz_response222 adminz_response"></div>';
            },
            $this->id,
            'adminz_mailer_test'
        );

        // field 
        add_settings_field(
            wp_rand(),
            'Server information',
            function () {
                // clone from smtp mailer
                $server_info    = [];
                $server_info[]  = sprintf('OS: %s%s', php_uname(), PHP_EOL);
                $server_info[]  = sprintf('PHP version: %s%s', PHP_VERSION, PHP_EOL);
                $server_info[]  = sprintf('WordPress version: %s%s', get_bloginfo('version'), PHP_EOL);
                $server_info[]  = sprintf('WordPress multisite: %s%s', (is_multisite() ? 'Yes' : 'No'), PHP_EOL);
                $openssl_status = 'Available';
                $openssl_text   = '';
                if (!extension_loaded('openssl') && !defined('OPENSSL_ALGO_SHA1')) {
                    $openssl_status = 'Not available';
                    $openssl_text   = ' (openssl extension is required in order to use any kind of encryption like TLS or SSL)';
                }
                $server_info[]               = sprintf('openssl: %s%s%s', $openssl_status, $openssl_text, PHP_EOL);
                $server_info[]               = sprintf('allow_url_fopen: %s%s', (ini_get('allow_url_fopen') ? 'Enabled' : 'Disabled'), PHP_EOL);
                $stream_socket_client_status = 'Not Available';
                $fsockopen_status            = 'Not Available';
                $socket_enabled              = false;
                if (function_exists('stream_socket_client')) {
                    $stream_socket_client_status = 'Available';
                    $socket_enabled              = true;
                }
                if (function_exists('fsockopen')) {
                    $fsockopen_status = 'Available';
                    $socket_enabled   = true;
                }
                $socket_text = '';
                if (!$socket_enabled) {
                    $socket_text = ' (In order to make a SMTP connection your server needs to have either stream_socket_client or fsockopen)';
                }
                $server_info[] = sprintf('stream_socket_client: %s%s', $stream_socket_client_status, PHP_EOL);
                $server_info[] = sprintf('fsockopen: %s%s%s', $fsockopen_status, $socket_text, PHP_EOL);
                echo '<div class="adminz_responsexx"><p>';
                echo implode("</p><p>", $server_info);
                echo '</p></div>';
            },
            $this->id,
            'adminz_mailer_test'
        );
    }
}