/*Antonis Mpelantis 3583*/

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <semaphore.h>
#include <time.h>
#include <unistd.h>

pthread_mutex_t mutex0, mutex1, mutex2;
pthread_t chef, cooks[3];
int materials[3] = {0, 0, 0}; //materials[0] = meat, materials[1] = potatoes, materials[2] = pita

//Function used from chef to select the materials
void select_materials(){
	int random[2];
        int i = (rand() % (2 - 0 + 1)) + 0, z;
        materials[i]++;
        while(1){
                z = (rand() % (2 - 0 + 1)) + 0;
                if(z != i){
                        materials[z]++;
                        break;
                }
        }
}

void createANDconsume(){
	printf("Finishing and consuming the meal.\n");
	materials[0] == 0;
	materials[1] == 0;
	materials[2] == 0;
	sleep(2);
}

void *cook_function(void *t){
	pthread_mutex_lock(&mutex1);
	int i;
 	for(i = 0; i < 3; i++){
                printf("\n\n materiala %d: %d", i , materials[i]);
        }

	if(materials[0] == 0){
		printf("Chef added potatoes and pita.\n");
		materials[0]++;
		printf("Cook 0 added meat.\n");
		createANDconsume();
		printf("The meal is over.\n\n");
	}
	else if(materials[1] == 0){
		printf("Chef added meat and pita.\n");
		materials[1]++;
		printf("Cook 1 added potatoes.\n");
		createANDconsume();
                printf("The meal is over.\n\n");
	}
	else if(materials[2] == 0){
		printf("Chef added meat and potatoes.\n");
		materials[2]++;
		printf("Cook 2 added pita.\n");
		createANDconsume();
                printf("The meal is over.\n\n");
	}

	printf("\n\n materialb %d: %d", 0 , materials[0]);
	printf("\n\n materialb %d: %d", 1 , materials[1]);
	printf("\n\n materialb %d: %d", 2 , materials[2]);
	pthread_mutex_unlock(&mutex1);
}


void *chef_function(void *t){
	while(1){
		pthread_mutex_lock(&mutex0);
		int i;
		select_materials();
		if(materials[0] == 0){
			pthread_join(cooks[0], NULL);
		}
		else if(materials[1] == 0){
			pthread_join(cooks[1], NULL);
		}
		else if(materials[2] == 0){
			pthread_join(cooks[2], NULL);
		}
		pthread_mutex_unlock(&mutex0);
	}
}

int main(){
	pthread_mutex_init(&mutex1, NULL);
	int i, c_thread;
	for(i = 0; i < 3; i++){
		c_thread = pthread_create(&(cooks[i]), NULL, &cook_function, NULL);
	}
//	pthread_mutex_destroy(&mutex1);
	pthread_mutex_init(&mutex0, NULL);
	c_thread = pthread_create(&chef, NULL, &chef_function, NULL);
	int j_thread;
	j_thread = pthread_join(chef, NULL);
//	pthread_mutex_destroy(&mutex0);
}