import path from 'path';

// Base directory for storing all pods

export const DATA_ROOT = process.env.DATA_ROOT || './data';

/**

* Convert URL path to filesystem path

* @param {string} urlPath - The URL path (e.g., /alice/profile/)

* @returns {string} - Filesystem path

*/

export function urlToPath(urlPath) {

// Normalize: remove leading slash, decode URI

let normalized = urlPath.startsWith('/') ? urlPath.slice(1) : urlPath;

normalized = decodeURIComponent(normalized);

// Security: prevent path traversal

normalized = normalized.replace(/\.\./g, '');

return path.join(DATA_ROOT, normalized);

}

/**

* Convert URL path to filesystem path in subdomain mode

* In subdomain mode, the pod is determined by the hostname, not the path

* @param {string} urlPath - The URL path (e.g., /public/file.txt)

* @param {string} podName - The pod name from subdomain (e.g., "alice")

* @returns {string} - Filesystem path (e.g., DATA_ROOT/alice/public/file.txt)

*/

export function urlToPathWithPod(urlPath, podName) {

// Normalize: remove leading slash, decode URI

let normalized = urlPath.startsWith('/') ? urlPath.slice(1) : urlPath;

normalized = decodeURIComponent(normalized);

// Security: prevent path traversal

normalized = normalized.replace(/\.\./g, '');

// Prepend pod name to path

return path.join(DATA_ROOT, podName, normalized);

}

/**

* Get the effective path for a request (subdomain-aware)

* @param {object} request - Fastify request object

* @returns {string} - Filesystem path

*/

export function getPathFromRequest(request) {

const urlPath = request.url.split('?')[0];

// In subdomain mode with a recognized pod subdomain

if (request.subdomainsEnabled && request.podName) {

return urlToPathWithPod(urlPath, request.podName);

}

// Path-based mode (default)

return urlToPath(urlPath);

}

/**

* Get the effective URL path for a request (with pod prefix in subdomain mode)

* @param {object} request - Fastify request object

* @returns {string} - URL path with pod prefix if needed

*/

export function getEffectiveUrlPath(request) {

const urlPath = request.url.split('?')[0];

// In subdomain mode with a recognized pod subdomain, prepend pod name

if (request.subdomainsEnabled && request.podName) {

return '/' + request.podName + urlPath;

}

return urlPath;

}

/**

* Check if URL path represents a container (ends with /)

* @param {string} urlPath

* @returns {boolean}

*/

export function isContainer(urlPath) {

return urlPath.endsWith('/');

}

/**

* Get the parent container path

* @param {string} urlPath

* @returns {string}

*/

export function getParentContainer(urlPath) {

const parts = urlPath.replace(/\/$/, '').split('/');

parts.pop();

return parts.join('/') + '/';

}

/**

* Get resource name from URL path

* @param {string} urlPath

* @returns {string}

*/

export function getResourceName(urlPath) {

const parts = urlPath.replace(/\/$/, '').split('/');

return parts[parts.length - 1];

}

/**

* Determine content type from file extension

* @param {string} filePath

* @returns {string}

*/

export function getContentType(filePath) {

const ext = path.extname(filePath).toLowerCase();

const types = {

'.jsonld': 'application/ld+json',

'.json': 'application/json',

'.html': 'text/html',

'.txt': 'text/plain',

'.css': 'text/css',

'.js': 'application/javascript',

'.png': 'image/png',

'.jpg': 'image/jpeg',

'.jpeg': 'image/jpeg',

'.gif': 'image/gif',

'.svg': 'image/svg+xml',

'.pdf': 'application/pdf',

'.ttl': 'text/turtle',

'.n3': 'text/n3',

'.nt': 'application/n-triples',

'.rdf': 'application/rdf+xml',

'.nq': 'application/n-quads',

'.trig': 'application/trig'

};

return types[ext] || 'application/octet-stream';

}

/**

* Check if content type is RDF

* @param {string} contentType

* @returns {boolean}

*/

export function isRdfContentType(contentType) {

const rdfTypes = [

'application/ld+json',

'application/json',

'text/turtle',

'text/n3',

'application/n-triples',

'application/rdf+xml',

'application/n-quads',

'application/trig'

];

return rdfTypes.includes(contentType);

}