<?php
/**
 * AJAX API voor Persoonlijke Agenda Notificaties
 */

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

$user = require_auth();
$db = get_db_connection();

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

$action = $_GET['action'] ?? ($_POST['action'] ?? '');
$today = date('Y-m-d');

try {
    // 1. Instellingen ophalen
    if ($action === 'get_settings') {
        $settings = get_user_notification_settings((int)$user['id']);
        echo json_encode([
            'success'  => true,
            'settings' => $settings,
        ]);
        exit;
    }

    // 2. Instellingen opslaan
    if ($action === 'save_settings') {
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $saved = update_user_notification_settings((int)$user['id'], $input);
        $settings = get_user_notification_settings((int)$user['id']);

        echo json_encode([
            'success'  => $saved,
            'settings' => $settings,
            'message'  => $saved ? 'Notificatievoorkeuren succesvol opgeslagen.' : 'Fout bij opslaan.',
        ]);
        exit;
    }

    // 3. Actuele agenda-afspraken van vandaag ophalen voor notificatie-evaluatie
    if ($action === 'get_events') {
        $userId = (int)$user['id'];
        $settings = get_user_notification_settings($userId);

        // Controleer of Outlook gekoppeld is
        $stmtInt = $db->prepare("SELECT * FROM integrations WHERE user_id = ? AND provider = 'OUTLOOK' AND is_enabled = 1");
        $stmtInt->execute([$userId]);
        $outlookInt = $stmtInt->fetch();

        $isLiveOutlook = !empty($outlookInt['access_token']) && empty($outlookInt['is_demo_mode']);
        $events = [];

        if ($isLiveOutlook) {
            $events = microsoft_fetch_today_events($userId, $today);
        }

        // Als er geen live Outlook events zijn, haal ook taken met tijdblokken op uit Fociz dagplanning
        $stmtTasks = $db->prepare("
            SELECT t.id, t.title, t.time_block_start, t.time_block_end, t.source, t.external_url
            FROM tasks t
            LEFT JOIN daily_plans dp ON t.daily_plan_id = dp.id
            WHERE t.user_id = ? AND (dp.plan_date = ? OR t.time_block_start IS NOT NULL) AND t.is_completed = 0
            ORDER BY t.time_block_start ASC
        ");
        $stmtTasks->execute([$userId, $today]);
        $tasks = $stmtTasks->fetchAll();

        foreach ($tasks as $t) {
            if (!empty($t['time_block_start'])) {
                $events[] = [
                    'id'          => 'task_' . $t['id'],
                    'subject'     => $t['title'],
                    'start'       => $t['time_block_start'],
                    'end'         => $t['time_block_end'] ?: date('H:i', strtotime($t['time_block_start'] . ' +30 minutes')),
                    'start_raw'   => "{$today}T{$t['time_block_start']}:00",
                    'location'    => 'Fociz Dagplanning',
                    'meeting_url' => $t['external_url'] ?? '/planner.php',
                    'is_all_day'  => false,
                    'source'      => 'FOCIZ_TASK',
                ];
            }
        }

        // Als er nog steeds geen afspraken zijn (en demo mode actief), lever sandbox items zodat er altijd getest kan worden
        if (empty($events) && (!empty($outlookInt['is_demo_mode']) || !$isLiveOutlook)) {
            $currentHour = (int)date('H');
            $nextHour = str_pad((string)(($currentHour + 1) % 24), 2, '0', STR_PAD_LEFT);
            $events = [
                [
                    'id'          => 'sandbox_meeting_1',
                    'subject'     => 'Focus Sync & Dagstart',
                    'start'       => "{$nextHour}:00",
                    'end'         => "{$nextHour}:30",
                    'start_raw'   => "{$today}T{$nextHour}:00:00",
                    'location'    => 'Microsoft Teams',
                    'meeting_url' => 'https://teams.microsoft.com',
                    'is_all_day'  => false,
                    'source'      => 'SANDBOX',
                ]
            ];
        }

        echo json_encode([
            'success'         => true,
            'server_time'     => date('H:i:s'),
            'server_datetime' => date('Y-m-d H:i:s'),
            'server_timestamp'=> time(),
            'settings'        => $settings,
            'events'          => $events,
            'count'           => count($events),
        ]);
        exit;
    }

    echo json_encode(['error' => 'Ongeldige actie']);
    exit;

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