<?php
/**
 * Fociz Microsoft Outlook 365 E-mail API Endpoint
 * Verwerkt ophalen van inbox, detailberichten, beantwoorden, doorsturen en 1-klik inplannen.
 */

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

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

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

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

$action = $_GET['action'] ?? ($_POST['action'] ?? '');

try {
    // 1. Inbox berichten ophalen
    if ($action === 'get_inbox') {
        $limit = isset($_GET['limit']) ? (int)$_GET['limit'] : 25;
        $unreadOnly = !empty($_GET['unread_only']) && $_GET['unread_only'] === '1';
        $forceRefresh = !empty($_GET['refresh']) && $_GET['refresh'] === '1';

        $res = microsoft_fetch_inbox_messages($userId, $limit, $unreadOnly, $forceRefresh);
        echo json_encode($res);
        exit;
    }

    // 2. Enkel bericht detail ophalen
    if ($action === 'get_message') {
        $messageId = trim($_GET['id'] ?? ($_POST['id'] ?? ''));
        if (empty($messageId)) {
            echo json_encode(['success' => false, 'error' => 'Geen bericht-ID opgegeven.']);
            exit;
        }

        $detail = microsoft_fetch_message_detail($userId, $messageId);
        if (!$detail) {
            echo json_encode(['success' => false, 'error' => 'Bericht niet gevonden of geen toegang.']);
            exit;
        }

        echo json_encode(['success' => true, 'message' => $detail]);
        exit;
    }

    // 3. Markeer als gelezen of ongelezen
    if ($action === 'mark_read') {
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $messageId = trim($input['id'] ?? '');
        $isRead = isset($input['is_read']) ? (bool)$input['is_read'] : true;

        if (empty($messageId)) {
            echo json_encode(['success' => false, 'error' => 'Geen bericht-ID opgegeven.']);
            exit;
        }

        $ok = microsoft_mark_message_read($userId, $messageId, $isRead);
        echo json_encode(['success' => $ok]);
        exit;
    }

    // 4. E-mail beantwoorden
    if ($action === 'reply') {
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $messageId = trim($input['id'] ?? '');
        $comment = trim($input['comment'] ?? '');
        $replyAll = !empty($input['reply_all']);

        if (empty($messageId) || empty($comment)) {
            echo json_encode(['success' => false, 'error' => 'Bericht-ID en reactietekst zijn verplicht.']);
            exit;
        }

        $res = microsoft_reply_message($userId, $messageId, $comment, $replyAll);
        echo json_encode($res);
        exit;
    }

    // 5. E-mail doorsturen
    if ($action === 'forward') {
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $messageId = trim($input['id'] ?? '');
        $toInput = $input['to'] ?? '';
        $comment = trim($input['comment'] ?? '');

        if (empty($messageId) || empty($toInput)) {
            echo json_encode(['success' => false, 'error' => 'Bericht-ID en minimaal één geadresseerde zijn verplicht.']);
            exit;
        }

        $recipients = [];
        if (is_array($toInput)) {
            $recipients = $toInput;
        } else {
            $parts = explode(',', (string)$toInput);
            foreach ($parts as $p) {
                $p = trim($p);
                if (filter_var($p, FILTER_VALIDATE_EMAIL)) {
                    $recipients[] = ['address' => $p, 'name' => $p];
                }
            }
        }

        if (empty($recipients)) {
            echo json_encode(['success' => false, 'error' => 'Geen geldige e-mailadressen ingevoerd.']);
            exit;
        }

        $res = microsoft_forward_message($userId, $messageId, $recipients, $comment);
        echo json_encode($res);
        exit;
    }

    // 6. E-mail direct inplannen in Fociz dagplanning
    if ($action === 'plan_email') {
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        $messageId = trim($input['message_id'] ?? $input['mail_id'] ?? '');
        $subject = trim($input['title'] ?? $input['subject'] ?? 'E-mail actiepunt');
        $planDate = trim($input['plan_date'] ?? $input['date'] ?? date('Y-m-d'));
        $timeBlockStart = !empty($input['time_block_start']) ? trim($input['time_block_start']) : null;
        $durationMinutes = (int)($input['duration_minutes'] ?? 30);
        $priority = in_array($input['priority'] ?? '', ['P1', 'P2', 'P3']) ? $input['priority'] : 'P2';
        $webLink = trim($input['web_link'] ?? 'https://outlook.office.com/mail/');
        $sender = trim($input['sender'] ?? $input['sender_name'] ?? '');

        if (empty($subject)) {
            echo json_encode(['success' => false, 'error' => 'Onderwerp is verplicht.']);
            exit;
        }

        if ($durationMinutes <= 0) $durationMinutes = 30;

        $timeBlockEnd = !empty($input['time_block_end']) ? trim($input['time_block_end']) : null;
        if (!empty($timeBlockStart) && empty($timeBlockEnd)) {
            try {
                $dtEnd = new DateTime("{$planDate} {$timeBlockStart}:00", new DateTimeZone('Europe/Amsterdam'));
                $dtEnd->modify("+{$durationMinutes} minutes");
                $timeBlockEnd = $dtEnd->format('H:i');
            } catch (Throwable $t) {}
        }

        // Zorg dat daily_plan bestaat
        $stmtPlan = $db->prepare("
            INSERT INTO daily_plans (user_id, plan_date)
            VALUES (?, ?)
            ON DUPLICATE KEY UPDATE id = LAST_INSERT_ID(id)
        ");
        $stmtPlan->execute([$userId, $planDate]);
        $planId = (int)$db->lastInsertId();

        // Als er een custom titel is ingevoerd, gebruik die direct, anders maak een nette titel
        $taskTitle = $subject;
        if (isset($input['subject']) && !isset($input['title'])) {
            $taskTitle = "✉️ " . $subject;
            if (!empty($sender) && strpos($taskTitle, $sender) === false) {
                $taskTitle .= " (van " . $sender . ")";
            }
        }

        $source = 'OUTLOOK_MAIL';
        $externalId = $messageId;
        $externalUrl = $webLink;
        $outlookSyncMsg = null;

        // Automatisch synchroniseren naar Microsoft Outlook agenda
        if (function_exists('microsoft_create_event')) {
            try {
                $syncStartTime = !empty($timeBlockStart) ? $timeBlockStart : '09:00';
                $msResult = microsoft_create_event($userId, [
                    'subject'          => $taskTitle,
                    'description'      => "E-mail actiepunt gepland via Fociz ({$priority})\n\nAfzender: {$sender}\nWeblink: {$webLink}",
                    'date'             => $planDate,
                    'start_time'       => $syncStartTime,
                    'end_time'         => $timeBlockEnd,
                    'duration_minutes' => $durationMinutes,
                ]);

                if (!empty($msResult['success']) && !empty($msResult['event_id'])) {
                    $source = 'OUTLOOK';
                    $externalId = $msResult['event_id'];
                    $externalUrl = $msResult['web_link'] ?? ($webLink ?: 'https://outlook.office.com');
                    $timeBlockStart = $msResult['start_time'] ?? $syncStartTime;
                    $timeBlockEnd = $msResult['end_time'] ?? $timeBlockEnd;
                    $outlookSyncMsg = 'Gesynchroniseerd naar Microsoft Outlook.';
                }
            } catch (Throwable $t) {
                error_log("Fout bij auto-sync Mail naar Outlook: " . $t->getMessage());
            }
        }

        $stmtTask = $db->prepare("
            INSERT INTO tasks (user_id, daily_plan_id, title, priority, time_block_start, time_block_end, duration_minutes, source, external_id, external_url)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        ");
        $stmtTask->execute([
            $userId,
            $planId,
            $taskTitle,
            $priority,
            $timeBlockStart,
            $timeBlockEnd,
            $durationMinutes,
            $source,
            $externalId,
            $externalUrl
        ]);
        $taskId = (int)$db->lastInsertId();

        echo json_encode([
            'success'        => true,
            'task_id'        => $taskId,
            'plan_date'      => $planDate,
            'outlook_synced' => ($source === 'OUTLOOK'),
            'message'        => "E-mail succesvol ingepland voor {$planDate}." . ($outlookSyncMsg ? " ({$outlookSyncMsg})" : "")
        ]);
        exit;
    }

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