/* C wrappers around some zfs calls and C in general that should simplify
 * using libzfs from go language, make go code shorter and more readable.
 */
 
#include <libzfs.h>
#include <memory.h>
#include <string.h>
#include <stdio.h>

#include "zpool.h"
#include "zfs.h"


dataset_list_t *create_dataset_list_item() {
	dataset_list_t *zlist = malloc(sizeof(dataset_list_t));
	memset(zlist, 0, sizeof(dataset_list_t));
	return zlist;
}

void dataset_list_close(dataset_list_t *list) {
	zfs_close(list->zh);
	free(list);
}

int dataset_list_callb(zfs_handle_t *dataset, void *data) {
	dataset_list_t **lroot = (dataset_list_t**)data;
	dataset_list_t *nroot = create_dataset_list_item();

	if ( !((*lroot)->zh) ) {
		(*lroot)->zh = dataset;
	} else {
		nroot->zh = dataset;
		nroot->pnext = (void*)*lroot;
		*lroot = nroot;
	}
	return 0;
}

int dataset_list_root(libzfs_handle_t *libzfs, dataset_list_t **first) {
	int err = 0;
	dataset_list_t *zlist = create_dataset_list_item();
	err = zfs_iter_root(libzfs, dataset_list_callb, &zlist);
	if ( zlist->zh ) {
		*first = zlist;
	} else {
		*first = 0;
		free(zlist);
	}
	return err;
}

dataset_list_t *dataset_next(dataset_list_t *dataset) {
	return dataset->pnext;
}


int dataset_list_children(zfs_handle_t *zfs, dataset_list_t **first) {
	int err = 0;
	dataset_list_t *zlist = create_dataset_list_item();
	err = zfs_iter_children(zfs, dataset_list_callb, &zlist);
	if ( zlist->zh ) {
		*first = zlist;
	} else {
		*first = 0;
		free(zlist);
	}
	return err;
}

int read_dataset_property(zfs_handle_t *zh, property_list_t *list, int prop) {
	int r = 0;
	zprop_source_t source;
	char statbuf[INT_MAX_VALUE];

	r = zfs_prop_get(zh, prop, 
		list->value, INT_MAX_VALUE, &source, statbuf, INT_MAX_VALUE, 1);
	if (r == 0) {
		// strcpy(list->name, zpool_prop_to_name(prop));
		zprop_source_tostr(list->source, source);
	}
	list->property = (int)prop;
	return r;
}

int clear_last_error(libzfs_handle_t *hdl) {
	zfs_standard_error(hdl, EZFS_SUCCESS, "success");
	return 0;
}

char** alloc_strings(int size) {
	return malloc(size*sizeof(char*));
}

void strings_setat(char **a, int at, char *v) {
	a[at] = v;
}