#include <queue.h>
#include <stdlib.h>
#include <logging.h>
#include <pthread.h>


t_queue *initQueue() {
    t_queue *queue = (t_queue*) malloc(sizeof(t_queue));
    if (! queue) {
        logmsg(LOG_ERR, "out of memory when initializing queue");
        return NULL;
    }

    queue->root = (t_queueBlock*) malloc(sizeof(t_queueBlock));
    if (! queue->root) {
        logmsg(LOG_ERR, "out of memory when initializing root of queue");
        free(queue);
        queue = NULL;
        return NULL;
    }

    queue->head = queue->root;
    queue->head_lock = PTHREAD_MUTEX_INITIALIZER;

    queue->tail = queue->root;
    queue->tail_lock = PTHREAD_MUTEX_INITIALIZER;

    queue->notEmptyLock = PTHREAD_MUTEX_INITIALIZER;
    queue->notEmpty = PTHREAD_COND_INITIALIZER;
}

// allocate memory for the queueBlock on your own and fill in the payloadc
void putQueue(t_queue *queue, t_queueBlock *queueBlock);

// will block if queue is empty
// remember to free the queueBlock afterwards
t_queueBlock *getQueue(t_queue *queue) {
    pthread_mutex_lock(&queue->notEmptyLock);
    while (queue->head == queue->tail) {
        pthread_cond_wait(&queue->notEmpty, &queue->notEmptyLock);
    }
    pthread_mutex_unlock(&queue->notEmpty);
    
    t_queueBlock item = queue->head;
    
}