<?php

declare(strict_types=1);

namespace OCA\MailCalendarSync\Controller;

use OCA\MailCalendarSync\AppInfo\Application;
use OCA\MailCalendarSync\Db\Config;
use OCA\MailCalendarSync\Db\ConfigMapper;
use OCA\MailCalendarSync\Db\LogMapper;
use OCA\MailCalendarSync\Service\CalendarService;
use OCA\MailCalendarSync\Service\MailService;
use OCA\MailCalendarSync\Service\SyncService;
use OCP\AppFramework\ApiController;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\JSONResponse;
use OCP\IRequest;

class SettingsController extends ApiController {

    private ConfigMapper $configMapper;
    private LogMapper $logMapper;
    private CalendarService $calendarService;
    private MailService $mailService;
    private SyncService $syncService;
    private ?string $userId;

    public function __construct(
        IRequest $request,
        ConfigMapper $configMapper,
        LogMapper $logMapper,
        CalendarService $calendarService,
        MailService $mailService,
        SyncService $syncService,
        ?string $userId,
    ) {
        parent::__construct(
            Application::APP_ID,
            $request,
            'PUT, GET, POST',
            'Authorization, Content-Type, Accept, requesttoken',
            86400
        );
        $this->configMapper = $configMapper;
        $this->logMapper = $logMapper;
        $this->calendarService = $calendarService;
        $this->mailService = $mailService;
        $this->syncService = $syncService;
        $this->userId = $userId;
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     */
    public function getConfig(): JSONResponse {
        try {
            $config = $this->configMapper->findByUserId($this->userId);
            return new JSONResponse($config->toArray());
        } catch (DoesNotExistException $e) {
            return new JSONResponse([
                'enabled' => false,
                'mailAccountId' => null,
                'calendarUri' => null,
                'autoAccept' => false,
                'syncInterval' => 600,
            ]);
        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Failed to load config: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     */
    public function setConfig(): JSONResponse {
        try {
            // Parse JSON body
            $body = file_get_contents('php://input');
            $data = json_decode($body, true);

            if (!is_array($data)) {
                return new JSONResponse(
                    ['error' => 'Invalid request body'],
                    Http::STATUS_BAD_REQUEST
                );
            }

            $enabled = !empty($data['enabled']);
            $mailAccountId = $data['mailAccountId'] ?? null;
            $calendarUri = $data['calendarUri'] ?? null;
            $autoAccept = !empty($data['autoAccept']);
            $syncInterval = (int)($data['syncInterval'] ?? 600);

            // Clamp sync interval to valid range (5 min to 24 hours)
            $syncInterval = max(300, min(86400, $syncInterval));

            // Normalize empty strings to null
            if ($mailAccountId === '' || $mailAccountId === '0') {
                $mailAccountId = null;
            }
            if ($calendarUri === '') {
                $calendarUri = null;
            }

            try {
                $config = $this->configMapper->findByUserId($this->userId);
            } catch (DoesNotExistException $e) {
                $config = new Config();
                $config->setUserId($this->userId);
                $config->setCreatedAt(date('Y-m-d H:i:s'));
            }

            $config->setEnabled($enabled ? 1 : 0);
            $config->setMailAccountId($mailAccountId !== null ? (int)$mailAccountId : null);
            $config->setCalendarUri($calendarUri);
            $config->setAutoAccept($autoAccept ? 1 : 0);
            $config->setSyncInterval($syncInterval);
            $config->setUpdatedAt(date('Y-m-d H:i:s'));

            if ($config->getId() === null) {
                $config = $this->configMapper->insert($config);
            } else {
                $config = $this->configMapper->update($config);
            }

            return new JSONResponse($config->toArray());

        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Failed to save: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     */
    public function getCalendars(): JSONResponse {
        try {
            $calendars = $this->calendarService->getWritableCalendars($this->userId);
            return new JSONResponse($calendars);
        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Failed to load calendars: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     */
    public function getMailAccounts(): JSONResponse {
        try {
            $accounts = $this->mailService->getMailAccounts($this->userId);
            return new JSONResponse($accounts);
        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Failed to load mail accounts: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     */
    public function getLog(): JSONResponse {
        try {
            $limit = (int)($this->request->getParam('limit', '50'));
            $offset = (int)($this->request->getParam('offset', '0'));

            $entries = $this->logMapper->findByUserId($this->userId, $limit, $offset);
            $data = array_map(fn($entry) => $entry->toArray(), $entries);

            return new JSONResponse($data);
        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Failed to load log: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }

    /**
     * @NoAdminRequired
     * @NoCSRFRequired
     *
     * Manually trigger a sync for the current user.
     */
    public function triggerSync(): JSONResponse {
        try {
            $stats = $this->syncService->syncForUser($this->userId);
            return new JSONResponse([
                'status' => 'ok',
                'stats' => $stats,
            ]);
        } catch (\Throwable $e) {
            return new JSONResponse(
                ['error' => 'Sync failed: ' . $e->getMessage()],
                Http::STATUS_INTERNAL_SERVER_ERROR
            );
        }
    }
}