<?php

namespace OCA\KiCanvasViewer\Controller;

use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\TemplateResponse;
use OCP\AppFramework\Http\DataDisplayResponse;
use OCP\Files\IRootFolder;
use OCP\IRequest;
use OCP\IUserSession;
use OCP\AppFramework\Http\Attribute\NoAdminRequired;
use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
use OCP\AppFramework\Http\JSONResponse;

class ViewerController extends Controller {
    public function __construct(
        string $appName,
        IRequest $request,
        private IRootFolder $rootFolder,
        private IUserSession $userSession,
    ) {
        parent::__construct($appName, $request);
    }

    #[NoAdminRequired]
    #[NoCSRFRequired]
    public function view(int $fileId): TemplateResponse {
        $file = $this->getFileById($fileId);
        $name = $file->getName();

        return new TemplateResponse('kicanvasviewer', 'viewer', [
            'fileId' => $fileId,
            'fileName' => $name,
        ]);
    }

    #[NoAdminRequired]
    #[NoCSRFRequired]
    public function file(int $fileId, string $name): DataDisplayResponse {
        $file = $this->getFileById($fileId);

        if (!preg_match('/\.(kicad_sch|kicad_pcb)$/i', $file->getName())) {
            return new DataDisplayResponse('Unsupported file type', 400);
        }

        $response = new DataDisplayResponse($file->getContent());
        $response->addHeader('Content-Type', 'text/plain; charset=utf-8');
        $response->addHeader('Content-Disposition', 'inline; filename="' . basename($file->getName()) . '"');

        return $response;
    }

    private function getFileById(int $fileId) {
        $user = $this->userSession->getUser();
        if ($user === null) {
            throw new \Exception('Not logged in');
        }

        $userFolder = $this->rootFolder->getUserFolder($user->getUID());
        $nodes = $userFolder->getById($fileId);

        if (empty($nodes)) {
            throw new \Exception('File not found');
        }

        return $nodes[0];
    }

    #[NoAdminRequired]
    #[NoCSRFRequired]
    public function resolve(string $etag): JSONResponse {
        $user = $this->userSession->getUser();

        if ($user === null) {
            return new JSONResponse(['error' => 'not logged in'], 401);
        }

        $userFolder = $this->rootFolder->getUserFolder($user->getUID());

        $nodes = array_merge(
            $userFolder->searchByMime('application/x-kicad-schematic'),
            $userFolder->searchByMime('application/x-kicad-pcb')
        );

        foreach ($nodes as $node) {
            if ($node->getEtag() === $etag) {
                return new JSONResponse([
                    'fileId' => $node->getId(),
                    'fileName' => $node->getName(),
                    'mime' => $node->getMimeType(),
                ]);
            }
        }

        return new JSONResponse(['error' => 'not found'], 404);
    }
}