// Zadatak 2b: Dretve
#include <iostream>
#include <iomanip>
#include <math.h>
#include <signal.h>
#include <unistd.h>
#include <pthread.h>

#define PI 3.14159265358979

using namespace std;

struct podaci_za_mnogokut
{
	int *n; // Broj stranica
	double *a; // Duljina stranica
	double *povrsina;
	double *opseg;
};

podaci_za_mnogokut m;
int br_m; // Broj mnogokuta

void m_povrsina(int i)
{
	m.povrsina[i] = (float)1 / 4 * m.n[i] * m.a[i] * m.a[i] / tan(PI / m.n[i]);
	cout << "n = " << left << setw(5)
		<< m.n[i] << " a = " << left << setw(5)
		<< m.a[i] << " P = " << m.povrsina[i] << endl;
}

void m_opseg(int i)
{
	m.opseg[i] = (float)m.n[i] * m.a[i];
	cout << "n = " << left << setw(5)
		<< m.n[i] << " a = " << left << setw(5)
		<< m.a[i]<< " O = " << m.opseg[i] << endl;
}

void *ispisi(void *arg)
{
	int i = *((int *)arg);
	m_povrsina(i);
	usleep(1000000);
	m_opseg(i);
}

void izbrisi(int sig)
{
	delete[] m.n;
	delete[] m.a;
	delete[] m.povrsina;
	delete[] m.opseg;

	exit(EXIT_SUCCESS);
}

void provjeri_parametre(int br_provjere, int arg_count, char **args)
{
	switch (br_provjere)
	{
		case 1:
			if (arg_count < 3 || arg_count > 11 || arg_count % 2 == 0)
			{
				cout << "Neispravan unos parametara!" << endl;
				exit(EXIT_FAILURE);
			}
			break;
		case 2:
			int j = 0;

			for (int i = 1; i < arg_count; i++)
			{
				if (atoi(args[i]) <= 0 || (i % 2 != 0 && atoi(args[i]) < 3))
				{
					cout << "Neispravan unos parametara!" << endl;
					izbrisi(0);
					exit(EXIT_FAILURE);
				}
				else
					if (i % 2 != 0) m.n[j] = atoi(args[i]);
					else m.a[j++] = atof(args[i]);
			}
			break;
	}
}

int main(int arg_count, char **args)
{
	provjeri_parametre(1, arg_count, args);

	br_m = (arg_count - 1) / 2;
	pthread_t thread_id[br_m];

	m.n = new int[br_m];
	m.a = new double[br_m];
	m.povrsina = new double[br_m];
	m.opseg = new double[br_m];
	sigset(SIGINT, izbrisi);

	provjeri_parametre(2, arg_count, args);

	for (int q = 0; q < br_m; q++)
	{
		if (pthread_create(&thread_id[q], NULL, &ispisi, &q) != 0)
		{
			cout << "Pogreska pri kreiranju dretve!" << endl;
			exit(EXIT_FAILURE);
		}
		usleep(1000000);
	}

	for (int z = 0; z < br_m; z++)
		pthread_join(thread_id[z], NULL);

	izbrisi(0);
	return 0;
}