//
//  main.cpp
//  mp2
//
//  Created by Jack Shirley on 2/14/18.
//  Copyright © 2018 Jack Shirley. All rights reserved.
//

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <sstream>
#include <unistd.h>
#include <time.h>
#include <ctime>

using namespace std;


string str;
string command = "";
vector<string> tokens;
vector<vector<string> > commands;


void multInputs(vector<vector<string> > &commands){     //for when theres piping
    for(int i = 0; i < commands.size(); i++){
        char * args[commands[i].size()];

            for(int j = 0; j < tokens.size(); j++){
                args[j] =  (char *)commands[i][j].c_str();
            }

        args[commands[i].size()] = NULL;
        execvp(args[0],args);
    }
    tokens.clear();
}



void singleInput(vector<vector<string> > &commands){    // jumps here if there is no piping involved
    char * args[commands[0].size()];
    for(int j = 0; j < commands[0].size(); j++){
        args[j] =  (char *)commands[0][j].c_str();
    }
    args[commands[0].size()] = NULL;
    execvp(args[0], args);
}




void split(const string &s) {   //Parser function
    stringstream ss(s);
    string item = "";
    while (ss >> item) {
        if(item == "|"){
            commands.push_back(tokens);
            tokens.clear();
        }else{
            tokens.push_back(item);
        }
    }
    commands.push_back(tokens);
    tokens.clear();


}


int main() {

    //*********************************************************
    //Custom Prompt features

    bool cust = false;

    time_t now;
    struct tm nowLocal;
    now = time(NULL);
    nowLocal = *localtime(&now);

    string terminalOut = "asdf";
    cout << "Custom or Default Prompt?" << endl;
    cin >> str;
    if(str == "Custom"){ //custom prompt or no?
            terminalOut = "/Users/jshirley/Documents/mp2.1 ";
            cust = true;

    }else{
        terminalOut = "$ ";
    }
    //*********************************************************



    while(true){                 //continuosly ask for user input
        if(cust == true){
            cout << terminalOut << nowLocal.tm_mon << "/" << nowLocal.tm_year << " " << nowLocal.tm_hour << "-" << nowLocal.tm_min;
        }
        cout << terminalOut;
        command = "";
        getline(cin, command);
        if(command == "logout"){     //exit loop if user logs out
            cout << "Logging off" << endl;
            break;
        }

        split(command);


        if(fork() == 0){
            if(commands.size() == 1){    //only run if single command
                singleInput(commands);
            }else{
                multInputs(commands);
            }
        }else{
            wait(0);
        }
        commands.clear();
    }

    return 0;
}