#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sem.h>
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <pthread.h>
#include <time.h>

#define EATING 1;
#define THINKING 2;
#define HUNGRY 3;

int phNum = 5;
int status[5] = {2, 2, 2, 2, 2};
pthread_mutex_t section;

void *philosopher(void *arg) {
    int id = arg;
    int left, right;
    switch (id) {
        case 0:
            left = 1;
            right = 4;
        break;
        case 4:
            left = 0;
            right = 3;
        break;
        default:
                right = id - 1;
            left = id + 1;
        break;
    }
        while(1)
        {
        printStat();
            think(id);
        printStat();
        while (status[id] != 1) {
            takeForks(id, left, right);
        }
        printStat();
            eat(id);
        printStat();
            putForks(id);
        }
        pthread_exit(NULL);
}

int printStat() {
    int i;
    for (i = 0; i < 5; i++) {
            printf("%ld, ", status[i]);
        }
        printf("\n");
        return 0;
}

int think(int id) {
    printf("Phil %ld is thinking\n", id);
        sleep(rand() % phNum + 1);
        status[id] = HUNGRY;
        return 0;
}

int eat(int id) {
    printf("Phil %ld is eating\n", id);
        sleep(rand() % phNum + 1);
        return 0;
}

int takeForks(int id, int left, int right) {
    pthread_mutex_lock(&section);
    if  ((status[left] != 1) && (status[right] != 1)) {
        printf("Phil %ld got forks \n", id, left, right);
        status[id] = EATING;
    }
    pthread_mutex_unlock(&section);
    return 0;
}

int putForks(int id) {
        printf("Phil %ld has released forks \n", id);
        status[id] = THINKING;
        return 0;
}

int main(int argc, char *argv[]) {
        srand (time(NULL));
        int i;
        for (i = 0; i < phNum; i++) {
            pthread_attr_t * thAttr = NULL;
            pthread_t tid;
            pthread_create(&tid, thAttr, philosopher, (void*)i);
    }
        while(1) {}
        return 0;
}