#include <iostream>
#include <fstream>
#include <cstring>
#include <unistd.h>
#include <chrono>
#include <sstream>
#include <string>
#include <bits/stdc++.h>

using namespace std;

struct process_detail {
	//cpu_burst_times[0] is arrival time
	int pid;
	vector<int> burst_times;
	int in_cpu1;
	int in_cpu2;
	int current_burst_index;
	int arrvival_time = 0;
	int wait_time = 0;
	int cpu_time = 0;
	int completion_time = 0;
};

struct clock{
	int timer;
};

vector<process_detail> processes;
queue<process_detail*> ready_queue_fifo;
process_detail* CPU1 = NULL;
process_detail* CPU2 = NULL;
vector<string> out_cpu1;
vector<string> out_cpu2;
ofstream output_file("cpu_times.txt");


// ------------------------------------- THE FIFO ---------------------------------------
void fifo() {
    // Clock initialized to 0
    struct clock time;
    memset(&time, 0, sizeof(struct clock));
    time.timer = 0;
    int process_count = processes.size();
    int completed_processes = 0;
	string out_string1 = "";
	string out_string2 = "";
	vector<process_detail*> waiting(process_count, NULL);

    while(completed_processes < process_count) {

        // Breaking from the infinite loop
        for (int j = 0; j < process_count; ++j) {
            if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
				waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
                waiting[j] = NULL;
				completed_processes++;
            }
        }

        // Managing arrival times
        for (int i = 0; i < process_count; ++i) {
            if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
				if(time.timer == processes[i].burst_times[0]) {
					processes[i].arrvival_time = time.timer;
					ready_queue_fifo.push(&processes[i]);
					processes[i].current_burst_index++;
				}
                
            }			
        }

        // Managing waiting queue
        for (int j = 0; j < waiting.size(); ++j) {
            if (waiting[j] != NULL) {
                if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
                    ready_queue_fifo.push(waiting[j]);
					waiting[j]->current_burst_index++;
					waiting[j] = NULL;
				}
            }
        }
        
        if (CPU1 == NULL && !ready_queue_fifo.empty()) {
			CPU1 = ready_queue_fifo.front();
			CPU1->in_cpu1 = 1;
			out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
			ready_queue_fifo.pop();
		}

        if (CPU2 == NULL && !ready_queue_fifo.empty()) {
			CPU2 = ready_queue_fifo.front();
			CPU2->in_cpu2 = 1;
			out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
			ready_queue_fifo.pop();
		} 

        // Check CPU1
        if(CPU1 != NULL) {
            //check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu1 == 1) {
					processes[i].cpu_time += 1;
					if(CPU1->burst_times[processes[i].current_burst_index] == 0){
						out_string1 += " " + to_string(time.timer);
						out_cpu1.push_back(out_string1);
						CPU1->in_cpu1 = 0;
						CPU1->current_burst_index++;
						waiting[CPU1->pid] = CPU1; // process added to waiting queue
						if(!ready_queue_fifo.empty()) {
							CPU1 = ready_queue_fifo.front(); // process added to CPU
							CPU1->in_cpu1 = 1;
							out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue_fifo.pop();
						}
						else {
							CPU1 = NULL;
						}
					}
				}
			}
        }

		if(CPU2 != NULL) {
			//check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu2 == 1) {
					processes[i].cpu_time += 1;
					if(CPU2->burst_times[processes[i].current_burst_index] == 0){
						out_string2 += " " + to_string(time.timer);
						out_cpu2.push_back(out_string2);
						CPU2->in_cpu2 = 0;
						CPU2->current_burst_index++;
						waiting[CPU2->pid] = CPU2; // process added to waiting queue
						if(!ready_queue_fifo.empty()) {
							CPU2 = ready_queue_fifo.front(); // process added to CPU
							CPU2->in_cpu2 = 1;
							out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue_fifo.pop();
						}
						else {
							CPU2 = NULL;
						}
					}
				}
			}
		}
		
        if(CPU1 != NULL) {
			CPU1->burst_times[CPU1->current_burst_index]--;
		}

        if(CPU2 != NULL) {
			CPU2->burst_times[CPU2->current_burst_index]--;
		}

		for(int j = 0; j < waiting.size(); ++j) {
			if(waiting[j] != NULL) {
				if(waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
					waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
				}
			}
		}
        // Increment the timer
        time.timer++;
    }
    return;

}

// ----------------------------------------THE Shortest Job First----------------------------------
// Custom comparator for the priority queue
struct Compare {
    bool operator()(process_detail* a, process_detail* b) {
        // Compare the elements in the vector at the given indices
		if (a->current_burst_index == 0) {
        	return a->burst_times[a->current_burst_index + 1] > b->burst_times[b->current_burst_index];
		}
		else if(b->current_burst_index == 0) {
        	return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index+1];

		}
		else if(b->current_burst_index == 0 && a->current_burst_index == 0)
        return a->burst_times[a->current_burst_index+1] > b->burst_times[b->current_burst_index+1];
        else return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index];
    }
};

priority_queue<process_detail*, vector<process_detail*>, Compare> ready_queue;

void sjf() {
    // Clock initialized to 0
    struct clock time;
    memset(&time, 0, sizeof(struct clock));
    time.timer = 0;
    int process_count = processes.size();
    int completed_processes = 0;
	vector<process_detail*> waiting(process_count, NULL);
	string out_string1 = "";
	string out_string2 = "";

    while(completed_processes < process_count) {

        // breaking from the infinite loop
		for (int j = 0; j < process_count; ++j) {
            if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
                waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
				waiting[j] = NULL;
				completed_processes++;
            }
        }

        // Managing arrival times
        for (int i = 0; i < process_count; ++i) {
            if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
				if(time.timer == processes[i].burst_times[0]) {
					ready_queue.push(&processes[i]);
					processes[i].current_burst_index++;
				}
                
            }			
        }

        // Managing waiting queue
        for (int j = 0; j < waiting.size(); ++j) {
            if (waiting[j] != NULL) {
                if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
                    ready_queue.push(waiting[j]);
					waiting[j]->current_burst_index++;
					waiting[j] = NULL;
				}
            }
        }
        
        if (CPU1 == NULL && !ready_queue.empty()) {
			// Assign the first process from the ready queue to the CPU
			CPU1 = ready_queue.top();
			CPU1->in_cpu1 = 1;
			// Record in_time when the process enters the CPU
			out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " "  + to_string(time.timer);
			ready_queue.pop();
		}

        if (CPU2 == NULL && !ready_queue.empty()) {
			// Assign the first process from the ready queue to the CPU
			CPU2 = ready_queue.top();
			CPU2->in_cpu2 = 1;
			// Record in_time when the process enters the CPU
			// output_file << endl;
			out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
			// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
			ready_queue.pop();
		} 

        // Check CPU1
        if(CPU1 != NULL) {
            //check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu1 == 1) {
					processes[i].cpu_time += 1;
					if(CPU1->burst_times[processes[i].current_burst_index] == 0){
						// Record out_time when the process exits the CPU
						out_string1 += " " + to_string(time.timer);
						// output_file << out_string1 << endl;
						out_cpu1.push_back(out_string1);
						CPU1->in_cpu1 = 0;
						CPU1->current_burst_index++;
						waiting[CPU1->pid] = CPU1; // process added to waiting queue
						if(!ready_queue.empty()) {
							CPU1 = ready_queue.top(); // process added to CPU
							CPU1->in_cpu1 = 1;
							out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue.pop();
						}
						else {
							CPU1 = NULL;
						}
					}
				}
			}
        }

		if(CPU2 != NULL) {
			//check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu2 == 1) {
					processes[i].cpu_time += 1;
					if(CPU2->burst_times[processes[i].current_burst_index] == 0){
						// Record out_time when the process exits the CPU
						out_string2 += " " + to_string(time.timer);
						// output_file << out_string2 << endl;
						out_cpu2.push_back(out_string2);
						CPU2->in_cpu2 = 0;
						CPU2->current_burst_index++;
						waiting[CPU2->pid] = CPU2; // process added to waiting queue
						if(!ready_queue.empty()) {
							CPU2 = ready_queue.top(); // process added to CPU
							CPU2->in_cpu2 = 1;
							out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue.pop();
						}
						else {
							CPU2 = NULL;
						}
					}
				}
			}
		}
		
        if(CPU1 != NULL) {
			CPU1->burst_times[CPU1->current_burst_index]--;
		}

        if(CPU2 != NULL) {
			CPU2->burst_times[CPU2->current_burst_index]--;
		}

		for(int j = 0; j < waiting.size(); ++j) {
			if(waiting[j] != NULL) {
				if(waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
					waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
				}
			}
		}
        // Increment the timer
        time.timer++;
    }
    return;
}
//  --------------------------- The Pre-emptive Shortest Job First ---------------------------------

void pre_sjf() {

    // Clock initialized to 0
    struct clock time;
    memset(&time, 0, sizeof(struct clock));
    time.timer = 0;
    int process_count = processes.size();
    int completed_processes = 0;
	string out_string1 = "";
	string out_string2 = "";
	vector<process_detail*> waiting(process_count, NULL);


    while(completed_processes < process_count) {

        // breaking from the infinite loop
		for (int j = 0; j < process_count; ++j) {
            if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
                waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
				waiting[j] = NULL;
				completed_processes++;
            }
        }

        // Managing arrival times
        for (int i = 0; i < process_count; ++i) {
            if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
				if(time.timer == processes[i].burst_times[0]) {
					ready_queue.push(&processes[i]);
					if(CPU1 != NULL) {
						ready_queue.push(CPU1);
						CPU1->in_cpu1 = 0;
						out_string1 += " " + to_string(time.timer);
						// output_file << out_string1 << endl;
						out_cpu1.push_back(out_string1);
						// output_file << " " << time.timer << endl;
						CPU1 = ready_queue.top();
						CPU1->in_cpu1 = 1;
						out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
						ready_queue.pop();
					}
					if(CPU2 != NULL) {
						ready_queue.push(CPU2);
						CPU2->in_cpu2 = 0;
						out_string2 += " " + to_string(time.timer);
						// output_file << out_string2 << endl;
						out_cpu2.push_back(out_string2);
						CPU2 = ready_queue.top();
						CPU2->in_cpu2 = 1;
						out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
						ready_queue.pop();
					}
					processes[i].current_burst_index++;
				}
                
            }			
        }

        // Managing waiting queue
        for (int j = 0; j < waiting.size(); ++j) {
            if (waiting[j] != NULL) {
                if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
                    ready_queue.push(waiting[j]);
					if(CPU1 != NULL) {
						ready_queue.push(CPU1);
						CPU1->in_cpu1 = 0;
						out_string1 += " " + to_string(time.timer);
						// output_file << out_string1 << endl;
						out_cpu1.push_back(out_string1);
						CPU1 = ready_queue.top();
						CPU1->in_cpu1 = 1;
						out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
						ready_queue.pop();

					}
					if(CPU2 != NULL) {
						ready_queue.push(CPU2);
						CPU2->in_cpu2 = 0;
						out_string2 += " " + to_string(time.timer);
						// output_file << out_string2 << endl;
						out_cpu2.push_back(out_string2);
						CPU2 = ready_queue.top();
						CPU2->in_cpu2 = 1;
						out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
						// output_file << "P" << CPU2->pid+1 << ",2" << " " << time.timer; // New entry time
						ready_queue.pop();

					}
					waiting[j]->current_burst_index++;
					waiting[j] = NULL;
				}
            }
        }
        
        if (CPU1 == NULL && !ready_queue.empty()) {
			// Assign the first process from the ready queue to the CPU
			CPU1 = ready_queue.top();
			CPU1->in_cpu1 = 1;
			// Record in_time when the process enters the CPU
			out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " "  + to_string(time.timer);
			// output_file << "P" << CPU1->pid + 1 << ",1 " << time.timer;
			ready_queue.pop();
		}

        if (CPU2 == NULL && !ready_queue.empty()) {
			// Assign the first process from the ready queue to the CPU
			CPU2 = ready_queue.top();
			CPU2->in_cpu2 = 1;
			// Record in_time when the process enters the CPU
			// output_file << endl;
			out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
			// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
			ready_queue.pop();
		} 

        // Check CPU1
        if(CPU1 != NULL) {
            //check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu1 == 1) {
					if(CPU1->burst_times[processes[i].current_burst_index] == 0){
						// Record out_time when the process exits the CPU
						out_string1 += " " + to_string(time.timer);
						// output_file << out_string1 << endl;
						out_cpu1.push_back(out_string1);
						CPU1->in_cpu1 = 0;
						CPU1->current_burst_index++;
						waiting[CPU1->pid] = CPU1; // process added to waiting queue
						if(!ready_queue.empty()) {
							CPU1 = ready_queue.top(); // process added to CPU
							CPU1->in_cpu1 = 1;
							out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue.pop();
						}
						else {
							CPU1 = NULL;
						}
					}
				}
			}
        }

		if(CPU2 != NULL) {
			//check cpu_burst complete
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu2 == 1) {
					if(CPU2->burst_times[processes[i].current_burst_index] == 0){
						// Record out_time when the process exits the CPU
						out_string2 += " " + to_string(time.timer);
						// output_file << out_string2 << endl;
						out_cpu2.push_back(out_string2);
						CPU2->in_cpu2 = 0;
						CPU2->current_burst_index++;
						waiting[CPU2->pid] = CPU2;// process added to waiting queue
						if(!ready_queue.empty()) {
							CPU2 = ready_queue.top(); // process added to CPU
							CPU2->in_cpu2 = 1;
							out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1) / 2) + " " + to_string(time.timer);
							ready_queue.pop();
						}
						else {
							CPU2 = NULL;
						}
					}
				}
			}
		}
		
        if(CPU1 != NULL) {
			CPU1->burst_times[CPU1->current_burst_index]--;
		}

        if(CPU2 != NULL) {
			CPU2->burst_times[CPU2->current_burst_index]--;
		}

		for(int j = 0; j < waiting.size(); ++j) {
			if(waiting[j] != NULL) {
				if(waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
					waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
				}
			}
		}
        // Increment the timer
        time.timer++;
    }
    return;
}

//  ---------------------------------- The Round Robin--------------------------------------------

void round_robin() {
    struct clock time;
    memset(&time, 0, sizeof(struct clock));
    time.timer = 0;
    int process_count = processes.size();
    int completed_processes = 0;
    int time_quantum = 5;
    int current_quantum1 = 0;
	int current_quantum2 = 0;
	string out_string1 = "";
	string out_string2 = "";
    // Initialize waiting vector with NULLs for each process slot
    vector<process_detail*> waiting(process_count, NULL);


    while (completed_processes < process_count) {
        // Check for process completion
        for (int j = 0; j < process_count; ++j) {
            if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
                waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
				waiting[j] = NULL;
				completed_processes++;
            }
        }

		// Managing arrival times
        for (int i = 0; i < process_count; ++i) {
            if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
				if(time.timer == processes[i].burst_times[0]) {
					processes[i].arrvival_time = time.timer;
					ready_queue_fifo.push(&processes[i]);
					processes[i].current_burst_index++;
				}
                
            }			
        }

        // Managing waiting queue
        for (int j = 0; j < waiting.size(); ++j) {
            if (waiting[j] != NULL) {
                if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
                    ready_queue_fifo.push(waiting[j]);
					waiting[j]->current_burst_index++;
					waiting[j] = NULL;
				}
            }
        }

        // Assign a process to CPU1 if available
        if (CPU1 == NULL && !ready_queue_fifo.empty()) {
            CPU1 = ready_queue_fifo.front();
            CPU1->in_cpu1 = 1;
			out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
            // output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
            ready_queue_fifo.pop();
            current_quantum1 = time_quantum;
        }

		// Assign a process to CPU2 if available
        if (CPU2 == NULL && !ready_queue_fifo.empty()) {
            CPU2 = ready_queue_fifo.front();
            CPU2->in_cpu2 = 1;
			out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
            // output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
            ready_queue_fifo.pop();
            current_quantum2 = time_quantum;
        }

        if (CPU1 != NULL) {
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu1 == 1){
					processes[i].cpu_time += 1;
					if (CPU1->burst_times[CPU1->current_burst_index] == 0 || current_quantum1 == 0) {
						// output_file << " " << time.timer << endl;
						out_string1 += " " + to_string(time.timer);
						out_cpu1.push_back(out_string1);
						CPU1->in_cpu1 = 0;
						if (CPU1->burst_times[CPU1->current_burst_index] == 0){
							CPU1->current_burst_index++;
							waiting[CPU1->pid] = CPU1;
						}

						else if (current_quantum1 == 0) ready_queue_fifo.push(CPU1);

						// Place the process in its corresponding waiting slot by pid

						if (!ready_queue_fifo.empty()) {
							CPU1 = ready_queue_fifo.front();
							CPU1->in_cpu1 = 1;
							out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
							// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
							ready_queue_fifo.pop();
							current_quantum1 = time_quantum;
						} else {
							CPU1 = NULL;
						}
					}
				}
			}
        }
		if (CPU2 != NULL) {
			for(int i = 0; i < process_count; ++i) {
				if(processes[i].in_cpu2 == 1){
					processes[i].cpu_time += 1;
					if (CPU2->burst_times[CPU2->current_burst_index] == 0 || current_quantum2 == 0) {
						// output_file << " " << time.timer << endl;
						out_string2 += " " + to_string(time.timer);
						out_cpu2.push_back(out_string2);
						CPU2->in_cpu2 = 0;
						if (CPU2->burst_times[CPU2->current_burst_index] == 0){
							CPU2->current_burst_index++;
							waiting[CPU2->pid] = CPU2;
						}

						else if (current_quantum2 == 0) ready_queue_fifo.push(CPU2);

						// Place the process in its corresponding waiting slot by pid

						if (!ready_queue_fifo.empty()) {
							CPU2 = ready_queue_fifo.front();
							CPU2->in_cpu2 = 1;
							out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
							// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
							ready_queue_fifo.pop();
							current_quantum2 = time_quantum;
						} else {
							CPU2 = NULL;
						}
					}
				}
			}
        }

		if(CPU1 != NULL) {
			CPU1->burst_times[CPU1->current_burst_index]--;
			current_quantum1--;
		}

        if(CPU2 != NULL) {
			CPU2->burst_times[CPU2->current_burst_index]--;
			current_quantum2--;
		}

        // Manage IO bursts in waiting queue
        for (int j = 0; j < process_count; ++j) {
            if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
                waiting[j]->burst_times[waiting[j]->current_burst_index]--;
            }
        }

        // Increment the timer
        time.timer++;
    }

}

int main(int argc, char **argv) {

    if(argc != 3)
	{
		cout <<"usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\nprovided arguments:\n";
		for(int i = 0; i < argc; i++)
			cout << argv[i] << "\n";
		return -1;
	}

    char *file_to_search_in = argv[1];
	char *scheduler_algorithm = argv[2];

    ifstream file(file_to_search_in, ios::binary);
    // ifstream file("process1.dat", ios::binary);
    string buffer;
    int pid = 0;

    while(getline(file, buffer)) {
		if(buffer[0] == '<'){
			continue;
		}
		istringstream iss(buffer);
		string word;
		struct process_detail pd;
		memset(&pd,0,sizeof(struct process_detail));
		pd.pid = pid++;
		pd.current_burst_index = 0;

		while(iss>>word){
			pd.burst_times.push_back(stoi(word));
		}
		processes.push_back(pd);
    }

	map<string, int> temp;
	temp["fifo"] = 1;
	temp["sjf"] = 2;
	temp["pre_sjf"] = 3;
	temp["rr"] = 4;

	string temp1 = scheduler_algorithm;
	// string temp1 = "pre_sjf";

	// Start time point
    auto start = std::chrono::high_resolution_clock::now();

	switch(temp[temp1]){
		case 1:
			fifo();
			break;
		case 2:
			sjf();
			break;
		case 3:
			pre_sjf();
			break;
		case 4:
			round_robin();
			break;
		default:
			cout << "enter fifo or sjf or pre_sjf or rr" << endl;
	}
	auto end = std::chrono::high_resolution_clock::now();
	auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);

	output_file << "CPU1" << endl;
	for(int i = 0; i < out_cpu1.size(); ++i) {
		output_file << out_cpu1[i] << endl;
	}

	output_file << "CPU2" << endl;
	for(int i = 0; i < out_cpu2.size(); ++i) {
		output_file << out_cpu2[i] << endl;
	}
	float tot = 0;
	int count = processes.size();
	for(int i = 0; i < processes.size(); ++i) {
		tot += processes[i].completion_time;
		cout <<  "Process " << i+1 << " Completion Time: " << processes[i].completion_time << endl;
	}	
	cout << "Average Completion Time: " << tot/count << endl;
	tot = 0;
	for(int i = 0; i < processes.size(); ++i) {
		tot += processes[i].completion_time - processes[i].cpu_time;
		cout <<  "Process " << i+1 << " Waiting Time: " << processes[i].completion_time - processes[i].cpu_time << endl;	
		// cout <<  "Process " << i+1 << " Waiting Time: " << processes[i].wait_time << endl;	
	}
	cout << "Average Waiting Time: " << tot/count << endl;

	std::cout << "Execution time: " << duration.count() << " ms" << std::endl;
    return 0;
}