<?php
/**
 * Fociz Live Sync & Realtime Notificatie Hub
 * Controleert continu op nieuwe Outlook e-mails, relevante Jira tickets en agenda updates.
 */

require_once __DIR__ . '/../includes/auth.php';
require_once __DIR__ . '/../includes/integrations/microsoft.php';
require_once __DIR__ . '/../includes/integrations/jira.php';

$user = require_auth();
$userId = (int)$user['id'];
$db = get_db_connection();

// Geef het PHP sessieslot direct vrij zodat gelijktijdige paginanavigatie nooit geblokkeerd wordt
if (session_status() === PHP_SESSION_ACTIVE) {
    session_write_close();
}

header('Content-Type: application/json; charset=utf-8');

try {
    $nowTs = time();
    $nowIso = date('Y-m-d H:i:s');
    $today = date('Y-m-d');

    $clientLastMailId = trim($_GET['last_mail_id'] ?? '');
    $clientLastJiraKey = trim($_GET['last_jira_key'] ?? '');
    $clientCalendarHash = trim($_GET['calendar_hash'] ?? '');

    // 1. Outlook E-mail Controle
    $mailRes = microsoft_fetch_inbox_messages($userId, 5);
    $messages = $mailRes['messages'] ?? [];
    $unreadCount = (int)($mailRes['unread_count'] ?? 0);
    $latestMail = $messages[0] ?? null;

    $hasNewMail = false;
    $newMailPayload = null;

    if ($latestMail && !empty($latestMail['id'])) {
        // Als de client een ander ID heeft dan de allernieuwste mail en het bericht is ongelezen
        if (!empty($clientLastMailId) && $latestMail['id'] !== $clientLastMailId && empty($latestMail['is_read'])) {
            $hasNewMail = true;
            $newMailPayload = [
                'id'             => $latestMail['id'],
                'subject'        => $latestMail['subject'],
                'from_name'      => $latestMail['from_name'],
                'from_email'     => $latestMail['from_email'],
                'received_human' => $latestMail['received_human'],
                'web_link'       => $latestMail['web_link'] ?? '/mail.php',
            ];
        }
    }

    // 2. Jira Tickets Controle (rekening houdend met persoonlijke toewijzing & default queue filter zoals DX of SD)
    $userFilterCode = $user['default_jira_filter_code'] ?? '';
    $jiraData = jira_get_user_issues($userId);
    $assignedIssues = $jiraData['assigned_issues'] ?? ($jiraData['issues'] ?? []);
    $teamIssues = $jiraData['team_issues'] ?? [];

    $dxValues = ['koppelingen', 'sso-koppeling', 'rest-endpoints', 'datadump', 'uwv-koppeling', 'migratie'];
    $relevantIssues = [];

    // Filter issues die specifiek relevant zijn voor deze medewerker
    foreach (array_merge($assignedIssues, $teamIssues) as $iss) {
        $isAssignedToMe = !empty($iss['assignee_name']) && (stripos($iss['assignee_name'], $user['name']) !== false || stripos($iss['assignee_name'], 'Niek') !== false);
        $ol = strtolower(trim($iss['onderwerp_logging'] ?? ''));

        $isQueueMatch = false;
        if (!empty($userFilterCode)) {
            if ($userFilterCode === 'DX' && in_array($ol, $dxValues)) {
                $isQueueMatch = true;
            } elseif ($userFilterCode === 'SD' && ($ol === '' || $ol === 'empty' || !in_array($ol, $dxValues))) {
                $isQueueMatch = true;
            }
        }

        if ($isAssignedToMe || $isQueueMatch) {
            $relevantIssues[$iss['key']] = $iss;
        }
    }

    $hasNewJira = false;
    $newJiraPayload = [];
    $newestJiraKey = '';

    if (!empty($relevantIssues)) {
        // Pak het nieuwste ticket
        $newest = reset($relevantIssues);
        $newestJiraKey = $newest['key'];

        if (!empty($clientLastJiraKey) && $newestJiraKey !== $clientLastJiraKey) {
            $hasNewJira = true;
            $newJiraPayload = [
                'key'         => $newest['key'],
                'summary'     => $newest['summary'],
                'priority'    => $newest['priority'] ?? 'Medium',
                'issue_type'  => $newest['issue_type'] ?? 'Taak',
                'project'     => $newest['project'] ?? 'SD',
                'url'         => $newest['url'] ?? ('/jira.php?highlight=' . $newest['key']),
            ];
        }
    }

    // 3. Outlook Agenda Controle (Tijdlijn events van vandaag)
    $calendarChanged = false;
    $todayEvents = [];
    $stmtInt = $db->prepare("SELECT * FROM integrations WHERE user_id = ? AND provider = 'OUTLOOK' AND is_enabled = 1");
    $stmtInt->execute([$userId]);
    $outlookInt = $stmtInt->fetch();

    if ($outlookInt && !empty($outlookInt['access_token']) && empty($outlookInt['is_demo_mode'])) {
        $todayEvents = microsoft_fetch_today_events($userId, $today);
    }

    $calHash = md5(json_encode(array_map(function($e) {
        return ($e['id'] ?? '') . ($e['start'] ?? '') . ($e['end'] ?? '') . ($e['subject'] ?? '');
    }, $todayEvents)));

    if (!empty($clientCalendarHash) && $calHash !== $clientCalendarHash) {
        $calendarChanged = true;
    }

    // 4. Update sync timestamps in database
    $stmtUpdate = $db->prepare("UPDATE users SET last_mail_check_at = NOW(), last_jira_check_at = NOW() WHERE id = ?");
    $stmtUpdate->execute([$userId]);

    echo json_encode([
        'success'         => true,
        'server_time'     => date('H:i:s'),
        'mail' => [
            'has_new'      => $hasNewMail,
            'unread_count' => $unreadCount,
            'latest_id'    => $latestMail['id'] ?? '',
            'new_mail'     => $newMailPayload,
        ],
        'jira' => [
            'has_new'      => $hasNewJira,
            'newest_key'   => $newestJiraKey,
            'new_issue'    => $newJiraPayload,
        ],
        'calendar' => [
            'has_changes'  => $calendarChanged,
            'hash'         => $calHash,
            'count'        => count($todayEvents),
        ],
    ]);
    exit;

} catch (Throwable $e) {
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'error'   => $e->getMessage(),
    ]);
}