/**
 * Helper functions that implement "directory" functionality in the Terminal.
 * These aren't "real" directories, it's more of a pseudo-directory implementation
 * that uses mainly string manipulation.
 *
 * This file contains function that deal with Server-related directory things.
 * Functions that deal with the string manipulation can be found in
 * ./DirectoryHelpers.ts
 */
import {
    isValidDirectoryPath,
    isInRootDirectory,
    getFirstParentDirectory,
} from "./DirectoryHelpers";
import { BaseServer } from "../Server/BaseServer";

/**
 * Given a directory (by the full directory path) and a server, returns all
 * subdirectories of that directory. This is only for FIRST-LEVEl/immediate subdirectories
 */
export function getSubdirectories(serv: BaseServer, dir: string): string[] {
    const res: string[] = [];

    if (!isValidDirectoryPath(dir)) { return res; }

    let t_dir = dir;
    if (!t_dir.endsWith("/")) { t_dir += "/"; }

    function processFile(fn: string): void {
        if (t_dir === "/" && isInRootDirectory(fn)) {
            const subdir = getFirstParentDirectory(fn);
            if (subdir !== "/" && !res.includes(subdir)) {
                res.push(subdir);
            }
        } else if (fn.startsWith(t_dir)) {
            const remaining = fn.slice(t_dir.length);
            const subdir = getFirstParentDirectory(remaining);
            if (subdir !== "/" && !res.includes(subdir)) {
                res.push(subdir);
            }
        }
    }

    for (const script of serv.scripts) {
        processFile(script.filename);
    }

    for (const txt of serv.textFiles) {
        processFile(txt.fn);
    }

    return res;
}