<?php
/*
 * CRON - Email Parser (ImapEngine v1.22.4)
 * Process emails and create/update tickets using DirectoryTree/ImapEngine (no PHP IMAP extension).
 *
 * This is a full rewrite of your Webklex version to match behavior:
 * - Supports Standard IMAP, Google OAuth IMAP, Microsoft OAuth IMAP
 * - Pulls UNSEEN messages from INBOX
 * - Saves original email to .eml in uploads/tmp and attaches it to new tickets
 * - Parses From/Subject/CC/Date
 * - Prefers HTML body, falls back to text
 * - Inlines CID images into HTML (data: URIs) using body structure
 * - Stores non-inline attachments (extension allowlist)
 * - Handles replies by [PREFIX123] in subject, fuzzy duplicate subject match, known contact/domain, unknown sender option
 * - Moves processed mail to "ITFlow" folder, flags unprocessed
 */

// Start the timer
$script_start_time = microtime(true);

// Set working directory to the directory this cron script lives at.
chdir(dirname(__FILE__));

// Ensure we're running from command line
if (php_sapi_name() !== 'cli') {
    die("This script must be run from the command line.\n");
}

// Autoload (ImapEngine & any composer deps)
require_once "../plugins/vendor/autoload.php";

// Get ITFlow config & helper functions
require_once "../config.php";

// Set Timezone
require_once "../includes/inc_set_timezone.php";
require_once "../functions.php";

// Get settings for the "default" company
require_once "../includes/load_global_settings.php";

$config_ticket_prefix = sanitizeInput($config_ticket_prefix);
$config_ticket_from_name = sanitizeInput($config_ticket_from_name);
$config_ticket_email_parse_unknown_senders = intval($row['config_ticket_email_parse_unknown_senders']);

// Get company name & phone & timezone
$sql = mysqli_query($mysqli, "SELECT * FROM companies, settings WHERE companies.company_id = settings.company_id AND companies.company_id = 1");
$row = mysqli_fetch_assoc($sql);
$company_name = sanitizeInput($row['company_name']);
$company_phone = sanitizeInput(formatPhoneNumber($row['company_phone'], $row['company_phone_country_code']));

// Check setting enabled
if ($config_ticket_email_parse == 0) {
    logApp("Cron-Email-Parser", "error", "Cron Email Parser unable to run - not enabled in admin settings.");
    exit("Email Parser: Feature is not enabled - check Settings > Ticketing > Email-to-ticket parsing. See https://docs.itflow.org/ticket_email_parse  -- Quitting..");
}

// System temp directory & lock
$temp_dir = sys_get_temp_dir();
$lock_file_path = "{$temp_dir}/itflow_email_parser_{$installation_id}.lock";

if (file_exists($lock_file_path)) {
    $file_age = time() - filemtime($lock_file_path);
    if ($file_age > 300) {
        unlink($lock_file_path);
        logApp("Cron-Email-Parser", "warning", "Cron Email Parser detected a lock file was present but was over 5 minutes old so it removed it.");
    } else {
        logApp("Cron-Email-Parser", "warning", "Lock file present. Cron Email Parser attempted to execute but was already executing, so instead it terminated.");
        exit("Script is already running. Exiting.");
    }
}
file_put_contents($lock_file_path, "Locked");

// Ensure lock gets removed even on fatal error
register_shutdown_function(function() use ($lock_file_path) {
    if (file_exists($lock_file_path)) {
        @unlink($lock_file_path);
    }
});

// Allowed attachment extensions
$allowed_extensions = array('jpg', 'jpeg', 'gif', 'png', 'webp', 'svg', 'pdf', 'txt', 'md', 'doc', 'docx', 'csv', 'xls', 'xlsx', 'xlsm', 'zip', 'tar', 'gz');

/** ------------------------------------------------------------------
 * Ticket / Reply helpers (UNCHANGED from your Webklex version)
 * ------------------------------------------------------------------ */
function addTicket($contact_id, $contact_name, $contact_email, $client_id, $date, $subject, $message, $attachments, $original_message_file, $ccs) {
    global $mysqli, $config_app_name, $company_name, $company_phone, $config_ticket_prefix, $config_ticket_client_general_notifications, $config_ticket_new_ticket_notification_email, $config_base_url, $config_ticket_from_name, $config_ticket_from_email, $config_ticket_default_billable, $allowed_extensions;
    $bad_pattern = "/do[\W_]*not[\W_]*reply|no[\W_]*reply/i"; // Email addresses to ignore

    // Atomically increment and get the new ticket number
    mysqli_query($mysqli, "
        UPDATE settings
        SET
            config_ticket_next_number = LAST_INSERT_ID(config_ticket_next_number),
            config_ticket_next_number = config_ticket_next_number + 1
        WHERE company_id = 1
    ");

    $ticket_number = mysqli_insert_id($mysqli);

    // Clean up the message
    $message = trim($message);
    // Remove DOCTYPE and meta tags
    $message = preg_replace('/<!DOCTYPE[^>]*>/i', '', $message);
    $message = preg_replace('/<meta[^>]*>/i', '', $message);
    // Remove <html>, <head>, <body> and their closing tags
    $message = preg_replace('/<\/?(html|head|body)[^>]*>/i', '', $message);
    // Collapse excess whitespace
    $message = preg_replace('/\s+/', ' ', $message);
    // Convert newlines to <br>
    $message = nl2br($message);
    // Wrap final formatted message
    $message = "<i>Email from: <b>$contact_name</b> &lt;$contact_email&gt; at $date:-</i> <br><br><div style='line-height:1.5;'>$message</div>";

    $ticket_prefix_esc = mysqli_real_escape_string($mysqli, $config_ticket_prefix);
    $message_esc = mysqli_real_escape_string($mysqli, $message);
    $contact_email_esc = mysqli_real_escape_string($mysqli, $contact_email);
    $client_id = intval($client_id);

    $url_key = randomString(32);

    mysqli_query($mysqli, "INSERT INTO tickets SET ticket_prefix = '$ticket_prefix_esc', ticket_number = $ticket_number, ticket_source = 'Email', ticket_subject = '$subject', ticket_details = '$message_esc', ticket_priority = 'Low', ticket_status = 1, ticket_billable = $config_ticket_default_billable, ticket_created_by = 0, ticket_contact_id = $contact_id, ticket_url_key = '$url_key', ticket_client_id = $client_id");
    $id = mysqli_insert_id($mysqli);

    // Logging
    logAction("Ticket", "Create", "Email parser: Client contact $contact_email_esc created ticket $ticket_prefix_esc$ticket_number ($subject) ($id)", $client_id, $id);

    mkdirMissing('../uploads/tickets/');
    $att_dir = "../uploads/tickets/" . $id . "/";
    mkdirMissing($att_dir);

    // Move original .eml into the ticket folder
    rename("../uploads/tmp/{$original_message_file}", "{$att_dir}/{$original_message_file}");
    $original_message_file_esc = mysqli_real_escape_string($mysqli, $original_message_file);
    mysqli_query($mysqli, "INSERT INTO ticket_attachments SET ticket_attachment_name = 'Original-parsed-email.eml', ticket_attachment_reference_name = '$original_message_file_esc', ticket_attachment_ticket_id = $id");

    // Save non-inline attachments
    foreach ($attachments as $attachment) {
        $att_name = $attachment['name'];
        $att_extension = strtolower(pathinfo($att_name, PATHINFO_EXTENSION));

        if (in_array($att_extension, $allowed_extensions)) {
            $att_saved_filename = md5(uniqid(rand(), true)) . '.' . $att_extension;
            $att_saved_path = $att_dir . $att_saved_filename;
            file_put_contents($att_saved_path, $attachment['content']);

            $ticket_attachment_name = sanitizeInput($att_name);
            $ticket_attachment_reference_name = sanitizeInput($att_saved_filename);

            $ticket_attachment_name_esc = mysqli_real_escape_string($mysqli, $ticket_attachment_name);
            $ticket_attachment_reference_name_esc = mysqli_real_escape_string($mysqli, $ticket_attachment_reference_name);
            mysqli_query($mysqli, "INSERT INTO ticket_attachments SET ticket_attachment_name = '$ticket_attachment_name_esc', ticket_attachment_reference_name = '$ticket_attachment_reference_name_esc', ticket_attachment_ticket_id = $id");
        } else {
            $ticket_attachment_name_esc = mysqli_real_escape_string($mysqli, $att_name);
            logAction("Ticket", "Edit", "Email parser: Blocked attachment $ticket_attachment_name_esc from Client contact $contact_email_esc for ticket $ticket_prefix_esc$ticket_number", $client_id, $id);
        }
    }

    // Add unknown guests as ticket watcher
    if ($client_id == 0 && !preg_match($bad_pattern, $contact_email_esc)) {
        mysqli_query($mysqli, "INSERT INTO ticket_watchers SET watcher_email = '$contact_email_esc', watcher_ticket_id = $id");
    }

    // Add CCs as ticket watchers
    foreach ($ccs as $cc) {
        if (filter_var($cc, FILTER_VALIDATE_EMAIL) && !preg_match($bad_pattern, $cc)) {
            $cc_esc = mysqli_real_escape_string($mysqli, $cc);
            mysqli_query($mysqli, "INSERT INTO ticket_watchers SET watcher_email = '$cc_esc', watcher_ticket_id = $id");
        }
    }

    // External email
    $data = [];
    if ($config_ticket_client_general_notifications == 1 && !preg_match($bad_pattern, $contact_email)) {
        $subject_email = "Ticket created - [$config_ticket_prefix$ticket_number] - $subject";
        $body = "<i style='color: #808080'>##- Please type your reply above this line -##</i><br><br>Hello $contact_name,<br><br>Thank you for your email. A ticket regarding \"$subject\" has been automatically created for you.<br><br>Ticket: $config_ticket_prefix$ticket_number<br>Subject: $subject<br>Status: New<br>Portal: <a href='https://$config_base_url/guest/guest_view_ticket.php?ticket_id=$id&url_key=$url_key'>View ticket</a><br><br>--<br>$company_name - Support<br>$config_ticket_from_email<br>$company_phone";
        $data[] = [
            'from' => $config_ticket_from_email,
            'from_name' => $config_ticket_from_name,
            'recipient' => $contact_email,
            'recipient_name' => $contact_name,
            'subject' => $subject_email,
            'body' => mysqli_real_escape_string($mysqli, $body)
        ];
    }

    // Internal email
    if ($config_ticket_new_ticket_notification_email) {
        if ($client_id == 0) {
            $client_name = "Guest";
            $client_uri = '';
        } else {
            $client_sql = mysqli_query($mysqli, "SELECT client_name FROM clients WHERE client_id = $client_id");
            $client_row = mysqli_fetch_assoc($client_sql);
            $client_name = sanitizeInput($client_row['client_name']);
            $client_uri = "&client_id=$client_id";
        }
        $email_subject = "$config_app_name - New Ticket - $client_name: $subject";
        $email_body = "Hello, <br><br>This is a notification that a new ticket has been raised in ITFlow. <br>Client: $client_name<br>Priority: Low (email parsed)<br>Link: https://$config_base_url/agent/ticket.php?ticket_id=$id$client_uri <br><br>--------------------------------<br><br><b>$subject</b><br>$message";

        $data[] = [
            'from' => $config_ticket_from_email,
            'from_name' => $config_ticket_from_name,
            'recipient' => $config_ticket_new_ticket_notification_email,
            'recipient_name' => $config_ticket_from_name,
            'subject' => $email_subject,
            'body' => mysqli_real_escape_string($mysqli, $email_body)
        ];
    }

    addToMailQueue($data);
    customAction('ticket_create', $id);

    return true;
}

function addReply($from_email, $date, $subject, $ticket_number, $message, $attachments) {
    global $mysqli, $config_app_name, $company_name, $company_phone, $config_ticket_prefix, $config_base_url, $config_ticket_from_name, $config_ticket_from_email, $allowed_extensions;

    $ticket_reply_type = 'Client';

    // 1) Remove the reply separator and everything below it (HTML-aware)
    $message = preg_replace(
        '/<i[^>]*>##-\s*Please\s+type\s+your\s+reply\s+above\s+this\s+line\s*-##<\/i>.*$/is',
        '',
        $message
    );

    // 2) Clean up the remaining message
    $message = preg_replace('/<!DOCTYPE[^>]*>/i', '', $message);
    $message = preg_replace('/<meta[^>]*>/i', '', $message);
    $message = preg_replace('/<\/?(html|head|body)[^>]*>/i', '', $message);
    $message = trim($message);
    $message = preg_replace('/\r\n|\r|\n/', ' ', $message);
    $message = nl2br($message);

    // 3) Final wrapper
    $message = "<i>Email from: $from_email at $date:-</i><br><br><div style='line-height:1.5;'>$message</div>";

    $ticket_number_esc = intval($ticket_number);
    $message_esc = mysqli_real_escape_string($mysqli, $message);
    $from_email_esc = mysqli_real_escape_string($mysqli, $from_email);

    $row = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT ticket_id, ticket_subject, ticket_status, ticket_contact_id, ticket_client_id, contact_email, client_name
        FROM tickets
        LEFT JOIN contacts on tickets.ticket_contact_id = contacts.contact_id
        LEFT JOIN clients on tickets.ticket_client_id = clients.client_id
        WHERE ticket_number = $ticket_number_esc LIMIT 1"));

    if ($row) {
        $ticket_id = intval($row['ticket_id']);
        $ticket_subject = sanitizeInput($row['ticket_subject']);
        $ticket_status = sanitizeInput($row['ticket_status']);
        $ticket_reply_contact = intval($row['ticket_contact_id']);
        $ticket_contact_email = sanitizeInput($row['contact_email']);
        $client_id = intval($row['ticket_client_id']);
        $client_uri = $client_id ? "&client_id=$client_id" : '';
        $client_name = sanitizeInput($row['client_name']);

        if ($ticket_status == 5) {
            $config_ticket_prefix_esc = mysqli_real_escape_string($mysqli, $config_ticket_prefix);
            $ticket_number_esc2 = mysqli_real_escape_string($mysqli, $ticket_number);

            appNotify("Ticket", "Email parser: $from_email attempted to re-open ticket $config_ticket_prefix_esc$ticket_number_esc2 (ID $ticket_id) - check inbox manually to see email", "/agent/ticket.php?ticket_id=$ticket_id$client_uri", $client_id);

            $email_subject = "Action required: This ticket is already closed";
            $email_body = "Hi there, <br><br>You've tried to reply to a ticket that is closed - we won't see your response. <br><br>Please raise a new ticket by sending a new e-mail to our support address below. <br><br>--<br>$company_name - Support<br>$config_ticket_from_email<br>$company_phone";

            $data = [
                [
                    'from' => $config_ticket_from_email,
                    'from_name' => $config_ticket_from_name,
                    'recipient' => $from_email,
                    'recipient_name' => $from_email,
                    'subject' => $email_subject,
                    'body' => mysqli_real_escape_string($mysqli, $email_body)
                ]
            ];

            addToMailQueue($data);
            return true;
        }

        if (empty($ticket_contact_email) || $ticket_contact_email !== $from_email) {
            $from_email_esc2 = mysqli_real_escape_string($mysqli, $from_email);
            $row2 = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT contact_id FROM contacts WHERE contact_email = '$from_email_esc2' AND contact_client_id = $client_id LIMIT 1"));
            if ($row2) {
                $ticket_reply_contact = intval($row2['contact_id']);
            } else {
                $ticket_reply_type = 'Internal';
                $ticket_reply_contact = '0';
                $message = "<b>WARNING: Contact email mismatch</b><br>$message";
                $message_esc = mysqli_real_escape_string($mysqli, $message);
            }
        }

        mysqli_query($mysqli, "INSERT INTO ticket_replies SET ticket_reply = '$message_esc', ticket_reply_type = '$ticket_reply_type', ticket_reply_time_worked = '00:00:00', ticket_reply_by = $ticket_reply_contact, ticket_reply_ticket_id = $ticket_id");
        $reply_id = mysqli_insert_id($mysqli);

        $ticket_dir = "../uploads/tickets/" . $ticket_id . "/";
        mkdirMissing($ticket_dir);

        foreach ($attachments as $attachment) {
            $att_name = $attachment['name'];
            $att_extension = strtolower(pathinfo($att_name, PATHINFO_EXTENSION));

            if (in_array($att_extension, $allowed_extensions)) {
                $att_saved_filename = md5(uniqid(rand(), true)) . '.' . $att_extension;
                $att_saved_path = $ticket_dir . $att_saved_filename;
                file_put_contents($att_saved_path, $attachment['content']);

                $ticket_attachment_name = sanitizeInput($att_name);
                $ticket_attachment_reference_name = sanitizeInput($att_saved_filename);

                $ticket_attachment_name_esc = mysqli_real_escape_string($mysqli, $ticket_attachment_name);
                $ticket_attachment_reference_name_esc = mysqli_real_escape_string($mysqli, $ticket_attachment_reference_name);
                mysqli_query($mysqli, "INSERT INTO ticket_attachments SET ticket_attachment_name = '$ticket_attachment_name_esc', ticket_attachment_reference_name = '$ticket_attachment_reference_name_esc', ticket_attachment_reply_id = $reply_id, ticket_attachment_ticket_id = $ticket_id");
            } else {
                $ticket_attachment_name_esc = mysqli_real_escape_string($mysqli, $att_name);
                logAction("Ticket", "Edit", "Email parser: Blocked attachment $ticket_attachment_name_esc from Client contact $from_email_esc for ticket $config_ticket_prefix$ticket_number_esc", $client_id, $ticket_id);
            }
        }

        $ticket_assigned_to_sql = mysqli_query($mysqli, "SELECT ticket_assigned_to FROM tickets WHERE ticket_id = $ticket_id LIMIT 1");
        if ($ticket_assigned_to_sql) {
            $row3 = mysqli_fetch_assoc($ticket_assigned_to_sql);
            $ticket_assigned_to = intval($row3['ticket_assigned_to']);

            if ($ticket_assigned_to) {
                $tech_sql = mysqli_query($mysqli, "SELECT user_email, user_name FROM users WHERE user_id = $ticket_assigned_to LIMIT 1");
                $tech_row = mysqli_fetch_assoc($tech_sql);
                $tech_email = sanitizeInput($tech_row['user_email']);
                $tech_name = sanitizeInput($tech_row['user_name']);

                $email_subject = "$config_app_name - Ticket updated - [$config_ticket_prefix$ticket_number] $ticket_subject";
                $email_body    = "Hello $tech_name,<br><br>A new reply has been added to the below ticket.<br><br>Client: $client_name<br>Ticket: $config_ticket_prefix$ticket_number<br>Subject: $ticket_subject<br>Link: https://$config_base_url/agent/ticket.php?ticket_id=$ticket_id$client_uri<br><br>--------------------------------<br>$message_esc";

                $data = [
                    [
                        'from' => $config_ticket_from_email,
                        'from_name' => $config_ticket_from_name,
                        'recipient' => $tech_email,
                        'recipient_name' => $tech_name,
                        'subject' => mysqli_real_escape_string($mysqli, $email_subject),
                        'body' => mysqli_real_escape_string($mysqli, $email_body)
                    ]
                ];
                addToMailQueue($data);
            }
        }

        mysqli_query($mysqli, "UPDATE tickets SET ticket_status = 2, ticket_resolved_at = NULL WHERE ticket_id = $ticket_id AND ticket_client_id = $client_id LIMIT 1");

        logAction("Ticket", "Edit", "Email parser: Client contact $from_email_esc updated ticket $config_ticket_prefix$ticket_number_esc ($subject)", $client_id, $ticket_id);
        customAction('ticket_reply_client', $ticket_id);
        return true;
    } else {
        return false;
    }
}

/** ------------------------------------------------------------------
 * OAuth helpers + provider guard (UNCHANGED)
 * ------------------------------------------------------------------ */

// returns true if expires_at ('Y-m-d H:i:s') is in the past (or missing)
function tokenExpired(?string $expires_at): bool {
    if (empty($expires_at)) return true;
    $ts = strtotime($expires_at);
    if ($ts === false) return true;
    // refresh a little early (60s) to avoid race
    return ($ts - 60) <= time();
}

// very small form-encoded POST helper using curl
function httpFormPost(string $url, array $fields): array {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($fields, '', '&'));
    curl_setopt($ch, CURLOPT_TIMEOUT, 20);
    $raw = curl_exec($ch);
    $err = curl_error($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    return ['ok' => ($raw !== false && $code >= 200 && $code < 300), 'body' => $raw, 'code' => $code, 'err' => $err];
}

function getGoogleAccessToken(string $username): ?string {
    global $mysqli,
           $config_mail_oauth_client_id,
           $config_mail_oauth_client_secret,
           $config_mail_oauth_refresh_token,
           $config_mail_oauth_access_token,
           $config_mail_oauth_access_token_expires_at;

    if (!empty($config_mail_oauth_access_token) && !tokenExpired($config_mail_oauth_access_token_expires_at)) {
        return $config_mail_oauth_access_token;
    }

    if (empty($config_mail_oauth_client_id) || empty($config_mail_oauth_client_secret) || empty($config_mail_oauth_refresh_token)) {
        return null;
    }

    $resp = httpFormPost(
        'https://oauth2.googleapis.com/token',
        [
            'client_id'     => $config_mail_oauth_client_id,
            'client_secret' => $config_mail_oauth_client_secret,
            'refresh_token' => $config_mail_oauth_refresh_token,
            'grant_type'    => 'refresh_token',
        ]
    );

    if (!$resp['ok']) return null;

    $json = json_decode($resp['body'], true);
    if (!is_array($json) || empty($json['access_token'])) return null;

    $expires_at = date('Y-m-d H:i:s', time() + (int)($json['expires_in'] ?? 3600));

    $config_mail_oauth_access_token = $json['access_token'];
    $config_mail_oauth_access_token_expires_at = $expires_at;

    $at_esc  = mysqli_real_escape_string($mysqli, $config_mail_oauth_access_token);
    $exp_esc = mysqli_real_escape_string($mysqli, $config_mail_oauth_access_token_expires_at);
    mysqli_query($mysqli, "UPDATE settings SET
        config_mail_oauth_access_token = '{$at_esc}',
        config_mail_oauth_access_token_expires_at = '{$exp_esc}'
        WHERE company_id = 1
    ");

    return $config_mail_oauth_access_token;
}

function getMicrosoftAccessToken(string $username): ?string {
    global $mysqli,
           $config_mail_oauth_client_id,
           $config_mail_oauth_client_secret,
           $config_mail_oauth_tenant_id,
           $config_mail_oauth_refresh_token,
           $config_mail_oauth_access_token,
           $config_mail_oauth_access_token_expires_at;

    if (!empty($config_mail_oauth_access_token) && !tokenExpired($config_mail_oauth_access_token_expires_at)) {
        return $config_mail_oauth_access_token;
    }

    if (empty($config_mail_oauth_client_id) || empty($config_mail_oauth_client_secret) || empty($config_mail_oauth_refresh_token) || empty($config_mail_oauth_tenant_id)) {
        return null;
    }

    $url = "https://login.microsoftonline.com/".rawurlencode($config_mail_oauth_tenant_id)."/oauth2/v2.0/token";

    $resp = httpFormPost($url, [
        'client_id'     => $config_mail_oauth_client_id,
        'client_secret' => $config_mail_oauth_client_secret,
        'refresh_token' => $config_mail_oauth_refresh_token,
        'grant_type'    => 'refresh_token',
    ]);

    if (!$resp['ok']) return null;

    $json = json_decode($resp['body'], true);
    if (!is_array($json) || empty($json['access_token'])) return null;

    $expires_at = date('Y-m-d H:i:s', time() + (int)($json['expires_in'] ?? 3600));

    $config_mail_oauth_access_token = $json['access_token'];
    $config_mail_oauth_access_token_expires_at = $expires_at;

    $at_esc  = mysqli_real_escape_string($mysqli, $config_mail_oauth_access_token);
    $exp_esc = mysqli_real_escape_string($mysqli, $config_mail_oauth_access_token_expires_at);
    mysqli_query($mysqli, "UPDATE settings SET
        config_mail_oauth_access_token = '{$at_esc}',
        config_mail_oauth_access_token_expires_at = '{$exp_esc}'
        WHERE company_id = 1
    ");

    return $config_mail_oauth_access_token;
}

// Provider from settings (may be NULL/empty to disable IMAP polling)
$imap_provider = $config_imap_provider ?? '';
if ($imap_provider === null) $imap_provider = '';

if ($imap_provider === '') {
    logApp("Cron-Email-Parser", "info", "IMAP polling skipped: provider not configured.");
    @unlink($lock_file_path);
    exit(0);
}

/** ------------------------------------------------------------------
 * ImapEngine setup (Standard / Google OAuth / Microsoft OAuth)
 * ------------------------------------------------------------------ */
use DirectoryTree\ImapEngine\Mailbox;

// Defaults from settings (standard IMAP)
$validate_cert = true;

$host = $config_imap_host;
$port = (int)$config_imap_port;
$encr = !empty($config_imap_encryption) ? $config_imap_encryption : null; // 'ssl'|'starttls'|null
$user = $config_imap_username;
$pass = $config_imap_password;
$auth = 'plain'; // 'oauth' for OAuth providers

if ($imap_provider === 'google_oauth') {
    $host = 'imap.gmail.com';
    $port = 993;
    $encr = 'ssl';
    $auth = 'oauth';
    $pass = getGoogleAccessToken($user);
    if (empty($pass)) {
        logApp("Cron-Email-Parser", "error", "Google OAuth: no usable access token (check refresh token/client credentials).");
        @unlink($lock_file_path);
        exit(1);
    }
} elseif ($imap_provider === 'microsoft_oauth') {
    $host = 'outlook.office365.com';
    $port = 993;
    $encr = 'ssl';
    $auth = 'oauth';
    $pass = getMicrosoftAccessToken($user);
    if (empty($pass)) {
        logApp("Cron-Email-Parser", "error", "Microsoft OAuth: no usable access token (check refresh token/client credentials/tenant).");
        @unlink($lock_file_path);
        exit(1);
    }
} else {
    // standard_imap (username/password)
    if (empty($host) || empty($port) || empty($user)) {
        logApp("Cron-Email-Parser", "error", "Standard IMAP: missing host/port/username.");
        @unlink($lock_file_path);
        exit(1);
    }
    // Map "tls" / "notls" from your old settings into ImapEngine's expected values
    // ImapEngine uses: 'ssl', 'starttls', or null.
    $e = strtolower((string)$encr);
    if ($e === 'tls') $encr = 'starttls';
    if ($e === 'notls' || $e === '') $encr = null;
}

$mailbox = new Mailbox([
    'host'          => $host,
    'port'          => $port,
    'username'      => $user,
    'password'      => $pass,     // OAuth token when authentication = oauth
    'encryption'    => $encr,     // 'ssl'|'starttls'|null
    'validate_cert' => (bool)$validate_cert,
    'authentication'=> $auth,     // 'plain'|'oauth'
    'timeout'       => 30,
    'debug'         => false,
]);

try {
    $mailbox->connect();
} catch (\Throwable $e) {
    echo "Error connecting to IMAP server: " . $e->getMessage() . "\n";
    @unlink($lock_file_path);
    exit(1);
}

// INBOX + ensure target folder exists
$inbox = $mailbox->inbox();

$targetFolderPath = 'ITFlow';
$targetFolder = $mailbox->folders()->find($targetFolderPath);
if (!$targetFolder) {
    try {
        $targetFolder = $mailbox->folders()->create($targetFolderPath);
    } catch (\Throwable $e) {
        // Race: if another process created it, find again
        $targetFolder = $mailbox->folders()->find($targetFolderPath);
        if (!$targetFolder) {
            logApp("Cron-Email-Parser", "error", "Failed to create/find target folder [$targetFolderPath]: ".$e->getMessage());
            $mailbox->disconnect();
            @unlink($lock_file_path);
            exit(1);
        }
    }
}

// Fetch unseen messages (match Webklex behavior: iterate messages, then explicitly mark/move)
$messages = $inbox->messages()
    ->unseen()
    ->withHeaders()
    ->withFlags()
    ->withBody()
    ->withBodyStructure()
    ->get();

// Counters
$processed_count = 0;
$unprocessed_count = 0;

// Process messages
foreach ($messages as $message) {
    $email_processed = false;
    $original_message_file = null;

    // Save original message as .eml
    try {
        mkdirMissing('../uploads/tmp/');
        $original_message_file = "processed-eml-" . randomString(200) . ".eml";

        $rawHead = $message->head() ?? '';
        $rawBody = $message->body() ?? '';

        // Ensure header/body separator
        $raw_message = (string)$rawHead;
        if ($raw_message !== '' && !preg_match("/\r?\n\r?\n$/", $raw_message)) {
            $raw_message .= "\r\n\r\n";
        }
        $raw_message .= (string)$rawBody;

        // Fallback if body() wasn't fetched / empty
        if (trim($raw_message) === '') {
            $raw_message = "Subject: ".($message->subject() ?? '')."\r\n\r\n".($message->html() ?: $message->text() ?: '');
        }

        file_put_contents("../uploads/tmp/{$original_message_file}", $raw_message);
    } catch (\Throwable $e) {
        logApp("Cron-Email-Parser", "warning", "Failed saving .eml (uid=".$message->uid()."): ".$e->getMessage());
        // Keep processing anyway
        $original_message_file = "processed-eml-" . randomString(200) . ".eml";
        @file_put_contents("../uploads/tmp/{$original_message_file}", "");
    }

    // From
    $fromAddr = $message->from(); // Address|null
    $from_email = sanitizeInput($fromAddr ? ($fromAddr->email() ?? 'itflow-guest@example.com') : 'itflow-guest@example.com');
    $from_name  = sanitizeInput($fromAddr ? ($fromAddr->name() ?? 'Unknown') : 'Unknown');

    $from_domain = explode("@", $from_email);
    $from_domain = sanitizeInput(end($from_domain));

    // Subject
    $subject = sanitizeInput((string)($message->subject() ?: 'No Subject'));

    // CC list
    $ccs = [];
    try {
        foreach (($message->cc() ?? []) as $ccAddr) {
            if ($ccAddr && $ccAddr->email()) {
                $ccs[] = $ccAddr->email();
            }
        }
    } catch (\Throwable $e) {
        // ignore
    }

    // Date
    try {
        $dt = $message->date();
        $date = sanitizeInput($dt ? $dt->format('Y-m-d H:i:s') : date('Y-m-d H:i:s'));
    } catch (\Throwable $e) {
        $date = sanitizeInput(date('Y-m-d H:i:s'));
    }

    // Body (prefer HTML)
    $message_body_html = '';
    $message_body_text = '';
    try { $message_body_html = (string)($message->html() ?? ''); } catch (\Throwable $e) {}
    try { $message_body_text = (string)($message->text() ?? ''); } catch (\Throwable $e) {}

    if (!empty($message_body_html)) {
        $message_body = $message_body_html;
    } elseif (!empty($message_body_text)) {
        $message_body = nl2br(htmlspecialchars($message_body_text));
    } else {
        // Final fallback to raw body (may be MIME-y, but keeps parity with your old fallback)
        $message_body = nl2br(htmlspecialchars((string)($message->body() ?? '')));
    }

    // Inline CID handling + attachments collection
    $attachments = [];

    // Track inline CIDs we embedded so we don't save them as attachments too
    $inline_cids = [];

    // Use body structure to find inline attachment parts and replace cid: refs
    try {
        if ($message->hasBodyStructure()) {
            $structure = $message->bodyStructure();
            $parts = $structure ? $structure->flatten() : [];

            foreach ($parts as $part) {
                // We want inline parts with a Content-ID
                if (!$part) continue;

                $isInline = false;
                try { $isInline = (bool)$part->isInline(); } catch (\Throwable $e) { $isInline = false; }

                $cid = null;
                try { $cid = $part->id(); } catch (\Throwable $e) { $cid = null; }
                if (!$isInline || empty($cid)) continue;

                // Fetch this inline part and embed into HTML
                $cid_trim = trim((string)$cid, "<> \t\r\n");
                if ($cid_trim === '') continue;

                $mime = 'application/octet-stream';
                try { $mime = (string)($part->contentType() ?: $mime); } catch (\Throwable $e) {}

                $content = null;
                try {
                    $content = $message->bodyPart($part->partNumber()); // default peek (does not mark seen)
                } catch (\Throwable $e) {
                    $content = null;
                }

                if ($content === null || $content === '') continue;

                $dataUri = "data:$mime;base64," . base64_encode($content);
                $message_body = str_replace(["cid:$cid_trim", "cid:<$cid_trim>", "cid:$cid"], $dataUri, $message_body);
                $inline_cids[$cid_trim] = true;
            }
        }
    } catch (\Throwable $e) {
        // ignore inline replacement errors
    }

    // Collect non-inline attachments from the high-level Attachment API
    try {
        foreach ($message->attachments() as $att) {
            if (!$att) continue;

            $name = $att->filename() ?: 'attachment';
            $content = $att->contents();
            $cid = null;
            try { $cid = $att->contentId(); } catch (\Throwable $e) { $cid = null; }
            $cid_trim = $cid ? trim((string)$cid, "<> \t\r\n") : null;

            // Skip inline ones we already embedded
            if ($cid_trim && isset($inline_cids[$cid_trim])) {
                continue;
            }

            if ($content !== null && $content !== '') {
                $attachments[] = [
                    'name' => $name,
                    'content' => $content,
                ];
            }
        }
    } catch (\Throwable $e) {
        // ignore
    }

    // 1. Reply to existing ticket with the number in subject
    if (preg_match("/\[$config_ticket_prefix(\d+)\]/", $subject, $ticket_number_matches)) {
        $ticket_number = intval($ticket_number_matches[1]);
        $email_processed = addReply($from_email, $date, $subject, $ticket_number, $message_body, $attachments);
    }

    // 2. Fuzzy duplicate check using a known contact/domain and similar_text subject
    if (!$email_processed && strlen(trim($subject)) > 10) {
        $contact_id = 0;
        $client_id  = 0;

        $from_email_esc = mysqli_real_escape_string($mysqli, $from_email);
        $contact_sql = mysqli_query($mysqli, "SELECT * FROM contacts WHERE contact_email = '$from_email_esc' AND contact_archived_at IS NULL LIMIT 1");
        $contact_row = mysqli_fetch_assoc($contact_sql);

        if ($contact_row) {
            $contact_id = intval($contact_row['contact_id']);
            $client_id  = intval($contact_row['contact_client_id']);
        } else {
            $from_domain_esc = mysqli_real_escape_string($mysqli, $from_domain);
            $domain_sql = mysqli_query($mysqli, "SELECT * FROM domains WHERE domain_name = '$from_domain_esc' AND domain_archived_at IS NULL LIMIT 1");
            $domain_row = mysqli_fetch_assoc($domain_sql);

            if ($domain_row && $from_domain == $domain_row['domain_name']) {
                $client_id = intval($domain_row['domain_client_id']);
            }
        }

        if ($client_id) {
            $recent_tickets_sql = mysqli_query($mysqli,
                "SELECT ticket_id, ticket_number, ticket_subject
                 FROM tickets
                 WHERE ticket_client_id = $client_id AND ticket_resolved_at IS NULL
                 AND ticket_created_at >= DATE_SUB(NOW(), INTERVAL 7 DAY)"
            );

            while ($rowt = mysqli_fetch_assoc($recent_tickets_sql)) {
                $ticket_number = intval($rowt['ticket_number']);
                $existing_subject = $rowt['ticket_subject'];

                similar_text(strtolower($subject), strtolower($existing_subject), $percent);

                if ($percent >= 95) {
                    $email_processed = addReply($from_email, $date, $subject, $ticket_number, $message_body, $attachments);
                    break;
                }
            }
        }
    }

    // 3. A known, registered contact?
    if (!$email_processed) {
        $from_email_esc = mysqli_real_escape_string($mysqli, $from_email);
        $any_contact_sql = mysqli_query($mysqli, "SELECT * FROM contacts WHERE contact_email = '$from_email_esc' AND contact_archived_at IS NULL LIMIT 1");
        $rowc = mysqli_fetch_assoc($any_contact_sql);

        if ($rowc) {
            $contact_name  = sanitizeInput($rowc['contact_name']);
            $contact_id    = intval($rowc['contact_id']);
            $contact_email = sanitizeInput($rowc['contact_email']);
            $client_id     = intval($rowc['contact_client_id']);

            $email_processed = addTicket($contact_id, $contact_name, $contact_email, $client_id, $date, $subject, $message_body, $attachments, $original_message_file, $ccs);
        }
    }

    // 4. A known domain?
    if (!$email_processed) {
        $from_domain_esc = mysqli_real_escape_string($mysqli, $from_domain);
        $domain_sql = mysqli_query($mysqli, "SELECT * FROM domains WHERE domain_name = '$from_domain_esc' AND domain_archived_at IS NULL LIMIT 1");
        $rowd = mysqli_fetch_assoc($domain_sql);

        if ($rowd && $from_domain == $rowd['domain_name']) {
            $client_id = intval($rowd['domain_client_id']);

            // Create a new contact
            $contact_name  = $from_name;
            $contact_email = $from_email;
            mysqli_query($mysqli, "INSERT INTO contacts SET contact_name = '".mysqli_real_escape_string($mysqli, $contact_name)."', contact_email = '".mysqli_real_escape_string($mysqli, $contact_email)."', contact_notes = 'Added automatically via email parsing.', contact_client_id = $client_id");
            $contact_id = mysqli_insert_id($mysqli);

            logAction("Contact", "Create", "Email parser: created contact " . mysqli_real_escape_string($mysqli, $contact_name), $client_id, $contact_id);
            customAction('contact_create', $contact_id);

            $email_processed = addTicket($contact_id, $contact_name, $contact_email, $client_id, $date, $subject, $message_body, $attachments, $original_message_file, $ccs);
        }
    }

    // 5. Unknown sender allowed?
    if (!$email_processed && $config_ticket_email_parse_unknown_senders) {
        $bad_from_pattern = "/daemon|postmaster|bounce|mta/i"; // Stop NDRs with bad subjects raising new tickets

        if (!preg_match($bad_from_pattern, $from_email)) {
            $email_processed = addTicket(0, $from_name, $from_email, 0, $date, $subject, $message_body, $attachments, $original_message_file, $ccs);
        } else {
            // Probably an NDR message without a ticket ref in the subject
            $failed_recipient  = null;
            $diagnostic_code   = null;
            $status_code       = null;
            $original_subject  = null;
            $original_to       = null;

            // ImapEngine: check attachments for DSN blocks (similar to your Webklex approach)
            try {
                foreach ($message->attachments() as $attachment) {
                    $ctype = strtolower((string)$attachment->contentType());
                    $body  = (string)$attachment->contents();

                    // 1. Delivery status block
                    if (strpos($ctype, 'delivery-status') !== false) {
                        if (preg_match('/Final-Recipient:\s*rfc822;\s*(.+)/i', $body, $m)) {
                            $failed_recipient = sanitizeInput(trim($m[1]));
                        }
                        if (preg_match('/Diagnostic-Code:\s*(.+)/i', $body, $m)) {
                            $diagnostic_code = sanitizeInput(trim($m[1]));
                        }
                        if (preg_match('/Status:\s*([0-9\.]+)/i', $body, $m)) {
                            $status_code = sanitizeInput(trim($m[1]));
                        }
                    }

                    // 2. Original message headers
                    if (strpos($ctype, 'message/rfc822') !== false) {
                        if (preg_match('/^To:\s*(.+)$/mi', $body, $m)) {
                            $original_to = sanitizeInput(trim($m[1]));
                        }
                        if (preg_match('/^Subject:\s*(.+)$/mi', $body, $m)) {
                            $original_subject = sanitizeInput(trim($m[1]));
                        }
                    }
                }
            } catch (\Throwable $e) {
                // ignore
            }

            // 3. Fallback: extract diagnostic from human-readable text
            if (!$diagnostic_code) {
                $text = $message_body_text ?: strip_tags($message_body);
                if (preg_match('/\n\s{2,}(.+)/', $text, $m)) {
                    $diagnostic_code = sanitizeInput(trim($m[1]));
                }
            }

            $failed_recipient = $failed_recipient ?: 'unknown recipient';
            $diagnostic_code  = $diagnostic_code ?: 'unknown diagnostic code';
            $status_code      = $status_code ?: 'unknown status code';
            $original_subject = $original_subject ?: $subject;

            appNotify(
                "Ticket",
                "Email parser NDR: Message to $failed_recipient bounced. Subject: $original_subject Diagnostics: $status_code / $diagnostic_code - check ITFlow folder manually to see email",
                "",
                0
            );

            // If the original subject has a ticket, add the NDR there too
            if (preg_match("/\[$config_ticket_prefix(\d+)\]/", $original_subject, $ticket_number_matches)) {
                $ticket_number = intval($ticket_number_matches[1]);

                $reply_body = "Email delivery failed.\n".
                    "Recipient: $failed_recipient\n".
                    "Status: $status_code\n".
                    "Diagnostic: $diagnostic_code\n";

                addReply(
                    $from_email,
                    $date,
                    $original_subject,
                    $ticket_number,
                    $reply_body,
                    []
                );
            }

            $email_processed = true;
        }
    }

    // Flag/move based on processing result
    if ($email_processed) {
        $processed_count++;
        try {
            $message->markSeen();
            $message->move($targetFolderPath); // expunge later
        } catch (\Throwable $e) {
            $subj = (string)($message->subject() ?? '');
            $uid  = (int)$message->uid();
            $path = $targetFolder ? $targetFolder->path() : $targetFolderPath;
            logApp(
                "Cron-Email-Parser",
                "warning",
                "Move failed (subject=\"$subj\", uid=$uid) to [$path]: ".$e->getMessage()
            );
        }
    } else {
        $unprocessed_count++;
        try {
            $message->markFlagged();
            $message->unmarkSeen();
        } catch (\Throwable $e) {
            logApp("Cron-Email-Parser", "warning", "Flag update failed: ".$e->getMessage());
        }
    }

    // Cleanup temp .eml if still present (e.g., reply path or addTicket moved it)
    if (!empty($original_message_file)) {
        $tmp_path = "../uploads/tmp/{$original_message_file}";
        if (file_exists($tmp_path)) { @unlink($tmp_path); }
    }
}

// Expunge inbox after moves (removes any \Deleted left by server-side MOVE implementation)
try {
    $inbox->expunge();
} catch (\Throwable $e) {
    // ignore
}

// Disconnect
try {
    $mailbox->disconnect();
} catch (\Throwable $e) {
    // ignore
}

// Execution timing (optional)
$script_end_time = microtime(true);
$execution_time = $script_end_time - $script_start_time;
$execution_time_formatted = number_format($execution_time, 2);

$processed_info = "Processed: $processed_count email(s), Unprocessed: $unprocessed_count email(s)";
// logAction("Cron-Email-Parser", "Execution", "Cron Email Parser executed in $execution_time_formatted seconds. $processed_info");

// Remove the lock file
unlink($lock_file_path);

// DEBUG
echo "\nLock File Path: $lock_file_path\n";
if (file_exists($lock_file_path)) {
    echo "\nLock is present\n\n";
}
echo "Processed Emails: $processed_count\n";
echo "Unprocessed Emails: $unprocessed_count\n";