// deployer main programm
// Copyright (C) 2024 Jean-Cloud
// GNU General Public License v3

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <filesystem>
#include "Services.h"
#include "Modules.h"
#include "BashManager.h"
using namespace std;

void help(char * argv0)
{
    //temporary 
    cout << "usage: ./" << argv0 <<"action file \n with action=deploy or remove and file=path to a file or all. \n" << endl;
}

int isServiceOnServer(string serviceUsername)
//this method tests if a certain service is on the current server
//it looks into the /etc/hosts file thanks to a pipe to a separate bash process
{
    string cmd ="getent hosts " +serviceUsername;  
    string result = BashManager::executeAndReadResult(cmd);
    if(result.find("::1")!=string::npos){ //if result contains "::1"
        cout << "service on server" << endl;
        return 0;
    }
    cout << "service not on server" << endl;
    return 1;
}

int createUser(string serviceUsername){
    //TO DO
    cout << "create user called" << endl;
    return 0;
}

int createEnv(string serviceUsername){
    //TO DO 
    cout << "create env called" << endl;
    return 0;
}

int runBashScripts(string serviceUsername){
    //TO DO
    cout << "run bash scripts called" << endl;
    return 0;
}

int deployAll(){
    //this method deploys all the services that are on this server
    cout << "deploying all" <<endl;
    return 0;
}

int deployService(string serviceUsername){
    //this method deploys indicated service if it is on this server
    //TO DO: faire des boucles if cohérentes
    if (isServiceOnServer(serviceUsername)==0){
        //bash user creation
        if(int userCreated = createUser(serviceUsername);userCreated!=0){
            return -1;
        }
        //environment variables creation
        if(int envCreated = createEnv(serviceUsername);envCreated!=0){
            return -1;
        }
        //bash scripts call
        if(int bashScriptsRun = runBashScripts(serviceUsername);bashScriptsRun!=0){
            return -1;
        }
        //call to the deploy functionality of all modules
        //the modules themselves determine their course of action depending on the service
        for(Module * mod_ptr : modules){
            int modResult = (*mod_ptr).deploy(serviceUsername);
            if (modResult!=0){
                cerr << "Error in module " << (*mod_ptr) << " when deploying " << serviceUsername << endl;
            }
        }
        return 0;
        cerr << "Error creating user and environment of "<<serviceUsername << endl;

    }
    return 0; 
}

int removeAll(){
    cout << "removing all"<<endl;
    return 0;
}

int removeService(string serviceUsername){
    cout<< "removing service"<<endl;
    return 0;
}

int main(int argc, char *argv[])
{
    //check number of arguments
    if (argc != 3){
        cerr << "Invalid number of arguments. \n" << endl;
        help(argv[0]);
        return -1;
    } else {
        //check that data is mounted on the server
        if (!(filesystem::exists("/data/mounted"))) {
            cerr << "Error. The data is not mounted on the server" << endl;
            return -1;
        } else {
            //read instructions
            string action = argv[1];
            string service = argv[2];
            if (action=="deploy"){
                if(service=="all"){
                    deployAll();
                } else {
                    deployService(service);
                }
            } else if (action=="remove"){
                if(service=="all"){
                    removeAll();
                } else {
                    removeService(service);
                }
            } else {
            cerr << "Invalid argument. \n" << endl;
            return -1;
            }
        }
    }
    return 0;
}