#include "linklist.h"
#include <pthread.h>
#include <stdlib.h>
#include <sys/stat.h>

int haggis_linklist_push(haggis_hardlink_list *list, haggis_hardlink *link) {
    pthread_mutex_lock(list->mutex);
    link->next = list->head;
    list->head = link;
    return pthread_mutex_unlock(list->mutex);
}

haggis_hardlink* haggis_linklist_get(haggis_hardlink_list *list, ino_t inode) {
    haggis_hardlink *link;

    pthread_mutex_lock(list->mutex);
    link = list->head;
    while(link != NULL) {
        if (link->inode == inode) {
            return link;
        }
        link = link->next;
    }
    pthread_mutex_unlock(list->mutex);
    return NULL;
}

char* haggis_linklist_get_or_put(haggis_hardlink_list *list, ino_t inode, char *fname) {
    haggis_hardlink *link;

    link = haggis_linklist_get(list, inode);
    if (link == NULL) {
        link = malloc(sizeof(haggis_hardlink));
        if (link == NULL) return NULL;
        link->inode = inode;
        link->next = NULL;
        haggis_linklist_push(list, link);
    } else {
        return link->fname;
    }
    return NULL;
}

void haggis_linklist_drain(haggis_hardlink_list *list) {
    haggis_hardlink *link;
    haggis_hardlink *next;

    pthread_mutex_lock(list->mutex);
    link = list->head;
    while (link != NULL) {
        next = link->next;
        free(link);
        link = next;
    }
    pthread_mutex_unlock(list->mutex);
}