import { Socket } from 'socket.io';

function cd(args:Array<string>, curdir:any, socket:Socket, filesystem:any, curdirx:Array<string>):string {
    var buf = "";
    if (args.length == 0) {
        buf += "Please specify a directory.\n";
        
    }
    else {
        if(args[0] == "..") {
            //go up one directory
            //recursively scan filesystem until we find curdir and then set curdir to its parent
            //check curdirx is not empty
            if (curdirx[socket.id].length > 0) {
                //pop off last element
                var sync = "filesystem[socket.id]";
                for(let i = 0; i < curdirx[socket.id].length; i++) {
                    sync += "['" + curdirx[socket.id][i] + "']";
                }
                sync += " = curdir[socket.id];";
                console.log(sync);
                eval(sync);
                curdirx[socket.id].pop();
                //curdir = filesystem[socket.id][(curdirx[socket.id][0])][(curdirx[socket.id][1])].......;
                //i know i shouldnt use eval but I don't know any other way to do this
                var cmdexec = "curdir[socket.id] = filesystem[socket.id]";
                //syncing = write curdir to a path in the filesystem
                for (let i = 0; i < curdirx[socket.id].length; i++) {
                    cmdexec += "[(curdirx[socket.id][" + i + "])]";
                }
                eval(cmdexec); 
            }                   
        }
        else {
            if (curdir[socket.id][args[0]] != undefined) {
                //check if type dict
                if (typeof curdir[socket.id][args[0]] == "object") {
                    curdir[socket.id] = curdir[socket.id][args[0]];
                    buf += "Changed directory to " + args[0] + "\n";
                    curdirx[socket.id].push(args[0]);
                }
                else{
                    buf += "cd: " + args[0] + ": Is not a directory\n";
                }
                
            }
            else {
                buf += "Directory " + args[0] + " does not exist.\n";
                
            }
        }
    }
    return buf;
}
export { cd };