//start ws server with socket.io
var http = require('http');
var express = require('express');
import { Request, Response } from 'express';
var app = express();
var server = http.createServer(app);
var port = process.env.PORT || 8480;
const { Server } = require("socket.io");
import { Socket } from 'socket.io';
const io = new Server(server);
//get resolvecommand from commands.ts
import { resolveCommand } from './commands/commands';

app.get('/', (req:Request, res:Response) => {
    res.sendFile(__dirname + '/website/index.html');
  }
);
app.get("/script.js", (req:Request, res:Response) => {
    res.sendFile(__dirname + '/website/script.js');
    }
);
app.get("/style.css", (req:Request, res:Response) => {
    res.sendFile(__dirname + '/website/style.css');
    }
);
//initialize buffer
//var buffer = [];
//add type for typescript
var buffer: { [id: string]: string } = {};
//var filesystem = [];
var filesystem: any = {};
//var curdir = [];
var curdir: any = {};
//var sessions = [];
var sessions: any = {};
//var curdirx = [];
var curdirx: any = {};
//on connection
function sendbuffer(socket:Socket, bufferx: { [id: string]: string }, forcefulload:boolean) {
    var bufx = bufferx[socket.id];
    //add placeholder character(reserved unicode) for blinking cursor in client;
    bufx += "\u2588";
    if(forcefulload) {
    socket.emit('buffer', bufx);
    }
    else {
    socket.emit('bufferx', bufx);
    }
}
io.on('connection', (socket:Socket) => {
    console.log('a user connected');
    buffer[socket.id] = "";
    filesystem[socket.id] = {};
    curdir[socket.id] = filesystem[socket.id];
    curdirx[socket.id] = [];
    //welcome message
    buffer[socket.id] = "Welcome to the console!\n";
    buffer[socket.id] += "Type 'help' to see the available commands.\n";
    buffer[socket.id] += "#";
    //send buffer
    sendbuffer(socket, buffer, true);

    socket.on('keypress', (data) => {
        console.log('a key was pressed');
        //get key
        //convert data to string
        var key = String.fromCharCode(data);
        //convert key to lowercase
        key = key.toLowerCase();
        console.log(data);        
        //check if key is enter
        if (data == 8){
            //backspace
            //if line is not empty remove last character if it is not the first character
            var lines = buffer[socket.id].split("\n");
            if (lines[lines.length - 1] != "#") {
                lines[lines.length - 1] = lines[lines.length - 1].slice(0, -1);
                socket.emit("lastline", lines[lines.length - 1]);
                buffer[socket.id] = lines.join("\n");
            }
        }
        else if(data == 13) {
            //execute command
            let lines = buffer[socket.id].split('\n');
            let command = lines[lines.length-1];
            //remove # from command
            command = command.substring(1);
            //remove \n and everything after
            command = command.substring(command.indexOf('\n'), command.length);
            let args = command.split(' ');
            let commandName = args[0];
            let commandArgs = args.slice(1);
            //remove trailing spaces
            commandArgs = commandArgs.map(function(arg) {
                return arg.trim();
            });
            //add \n to buffer
            buffer[socket.id] += "\n";
            //remove # in beginning of commandname
            console.log("Executing command: \"" + commandName + "\" with arguments: \"" + commandArgs + "\"");
            var bufko = "\n" + resolveCommand(commandName, socket, commandArgs, buffer, sessions, filesystem, curdir, curdirx);
            console.log("This command \""+ commandName +"\" with args:\""+commandArgs+"\" returned \""+bufko+"\"");
            bufko += "#";
            socket.emit("bufferx", "\n" + bufko+ '\u2588');
            buffer[socket.id] += bufko;
        }
        else{
            //add key to buffer
            buffer[socket.id] += key;
            socket.emit("bufferx", key+"\u2588");
        }
        //send buffer to client
    });
});
io.on('disconnect', (socket:Socket) => {
    console.log('user disconnected');
    buffer[socket.id] = "";
});

server.listen(port, function() {
    console.log('Server listening at port %d', port);
});