<?php

namespace App\Controllers;

use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use App\Services\PlayniteImportService;
use Slim\Views\Twig;

class PlayniteImportController extends Controller
{
    private \PDO $pdo;
    private PlayniteImportService $importService;
    protected $auth;

    public function __construct(\PDO $pdo, Twig $view, $auth = null)
    {
        parent::__construct($view, $auth);
        $this->pdo = $pdo;
        $this->importService = new PlayniteImportService($pdo);
        $this->auth = $auth;
    }

    /**
     * Show the import form
     */
    public function showImport(Request $request, Response $response, $args)
    {
        return $this->view->render($response, 'admin/playnite/import.twig', [
            'title' => 'Import Playnite Games',
            'csrf_token' => $this->generateCSRFToken()
        ]);
    }

    /**
     * Handle file upload and preview
     */
    public function upload(Request $request, Response $response, $args)
    {
        $data = $request->getParsedBody();
        $csrfToken = $data['csrf_token'] ?? '';

        // Verify CSRF token
        if (!$this->verifyCSRFToken($csrfToken)) {
            return $this->view->render($response->withStatus(400), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'Invalid CSRF token',
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }

        $uploadedFiles = $request->getUploadedFiles();

        if (empty($uploadedFiles['playnite_file'])) {
            return $this->view->render($response->withStatus(400), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'No file uploaded',
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }

        $file = $uploadedFiles['playnite_file'];

        // Validate file
        if ($file->getError() !== UPLOAD_ERR_OK) {
            return $this->view->render($response->withStatus(400), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'Upload error: ' . $this->getUploadErrorMessage($file->getError()),
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }

        // Check file type
        $filename = $file->getClientFilename();
        $extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));

        if (!in_array($extension, ['json'])) {
            return $this->view->render($response->withStatus(400), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'Only JSON files are supported',
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }

        // Move uploaded file to temp location
        $tempPath = sys_get_temp_dir() . '/playnite_import_' . uniqid() . '.json';
        $file->moveTo($tempPath);

        try {
            // Parse and validate the file
            $result = $this->importService->parsePlayniteFile($tempPath);

            // Store the temp file path and results in session for the confirmation step
            $_SESSION['playnite_import'] = [
                'temp_file' => $tempPath,
                'preview_data' => $result
            ];

            return $this->view->render($response, 'admin/playnite/preview.twig', [
                'title' => 'Preview Playnite Import',
                'preview' => $result,
                'filename' => $filename
            ]);

        } catch (\Exception $e) {
            // Clean up temp file
            if (file_exists($tempPath)) {
                unlink($tempPath);
            }

            return $this->view->render($response->withStatus(400), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'Error parsing file: ' . $e->getMessage(),
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }
    }

    /**
     * Confirm and execute the import
     */
    public function confirm(Request $request, Response $response, $args)
    {
        if (!isset($_SESSION['playnite_import'])) {
            return $response->withRedirect($this->getRoutePath('admin.playnite.import'));
        }

        $importData = $_SESSION['playnite_import'];
        $tempPath = $importData['temp_file'];
        $previewData = $importData['preview_data'];

        // Get import options from form
        $queryParams = $request->getQueryParams();
        $updateExisting = ($queryParams['update_existing'] ?? 'false') === 'true';

        try {
            // Execute the import
            $importResult = $this->importService->importGames($previewData['games'], $updateExisting);

            // Clean up temp file
            if (file_exists($tempPath)) {
                unlink($tempPath);
            }

            // Clear session data
            unset($_SESSION['playnite_import']);

            return $this->view->render($response, 'admin/playnite/result.twig', [
                'title' => 'Import Complete',
                'import_result' => $importResult,
                'preview_data' => $previewData
            ]);

        } catch (\Exception $e) {
            // Clean up temp file
            if (file_exists($tempPath)) {
                unlink($tempPath);
            }

            // Clear session data
            unset($_SESSION['playnite_import']);

            return $this->view->render($response->withStatus(500), 'admin/playnite/import.twig', [
                'title' => 'Import Playnite Games',
                'error' => 'Import failed: ' . $e->getMessage(),
                'csrf_token' => $this->generateCSRFToken()
            ]);
        }
    }

    /**
     * Cancel the import (cleanup)
     */
    public function cancel(Request $request, Response $response, $args)
    {
        if (isset($_SESSION['playnite_import'])) {
            $tempPath = $_SESSION['playnite_import']['temp_file'];
            if (file_exists($tempPath)) {
                unlink($tempPath);
            }
            unset($_SESSION['playnite_import']);
        }

        return $response->withRedirect($this->getRoutePath('admin.playnite.import'));
    }

    /**
     * API endpoint for programmatic imports
     */
    public function apiImport(Request $request, Response $response, $args)
    {
        $data = $request->getParsedBody();

        if (!isset($data['games']) || !is_array($data['games'])) {
            return $this->jsonResponse($response->withStatus(400), [
                'error' => 'Games data is required'
            ]);
        }

        try {
            $importResult = $this->importService->importGames($data['games'], $data['update_existing'] ?? true);

            return $this->jsonResponse($response, [
                'success' => true,
                'result' => $importResult
            ]);

        } catch (\Exception $e) {
            return $this->jsonResponse($response->withStatus(500), [
                'error' => $e->getMessage()
            ]);
        }
    }

    /**
     * Get upload error message
     */
    private function getUploadErrorMessage(int $errorCode): string
    {
        switch ($errorCode) {
            case UPLOAD_ERR_INI_SIZE:
                return 'File too large (exceeds server limit)';
            case UPLOAD_ERR_FORM_SIZE:
                return 'File too large (exceeds form limit)';
            case UPLOAD_ERR_PARTIAL:
                return 'File only partially uploaded';
            case UPLOAD_ERR_NO_FILE:
                return 'No file uploaded';
            case UPLOAD_ERR_NO_TMP_DIR:
                return 'No temporary directory';
            case UPLOAD_ERR_CANT_WRITE:
                return 'Cannot write to disk';
            case UPLOAD_ERR_EXTENSION:
                return 'File upload stopped by extension';
            default:
                return 'Unknown upload error';
        }
    }
}