#include "songvec.h"
#include "utils.h"

/* Only used for sorting/searchin a songvec, not general purpose compares */
static int songvec_cmp(const void *s1, const void *s2)
{
	const Song *a = ((const Song * const *)s1)[0];
	const Song *b = ((const Song * const *)s2)[0];
	return strcmp(a->url, b->url);
}

static size_t sv_size(struct songvec *sv)
{
	return sv->nr * sizeof(Song *);
}

void songvec_sort(struct songvec *sv)
{
	qsort(sv->base, sv->nr, sizeof(Song *), songvec_cmp);
}

Song *songvec_find(struct songvec *sv, const char *url)
{
	int i;

	for (i = sv->nr; --i >= 0; )
		if (!strcmp(sv->base[i]->url, url))
			return sv->base[i];
	return NULL;
}

int songvec_delete(struct songvec *sv, Song *del)
{
	int i;

	for (i = sv->nr; --i >= 0; ) {
		if (sv->base[i] != del)
			continue;
		/* we _don't_ call freeSong() here */
		if (!--sv->nr) {
			free(sv->base);
			sv->base = NULL;
		} else {
			memmove(&sv->base[i], &sv->base[i + 1],
				(sv->nr - i + 1) * sizeof(Song *));
			sv->base = xrealloc(sv->base, sv_size(sv));
		}
		return i;
	}

	return -1; /* not found */
}

void songvec_add(struct songvec *sv, Song *add)
{
	++sv->nr;
	sv->base = xrealloc(sv->base, sv_size(sv));
	sv->base[sv->nr - 1] = add;
}

void songvec_free(struct songvec *sv)
{
	free(sv->base);
	sv->base = NULL;
	sv->nr = 0;
}

/*
 * Removes missing songs from a songvec. This function is only temporary
 * as updating will be moved into a thread and updating shared memory...
 */
#include "path.h"
#include "ls.h"
void songvec_prune(struct songvec *sv)
{
	int i;
	char tmp[MPD_PATH_MAX];
	struct stat sb;

	for (i = sv->nr; --i >= 0; ) {
		Song *song = sv->base[i];
		assert(song);
		if (!myStat(get_song_url(tmp, song), &sb))
			continue;
		songvec_delete(sv, song);
		freeSong(song);
		i = sv->nr;
	}
}