/*
Copyright 2020 Google LLC

Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file or at
https://developers.google.com/open-source/licenses/bsd
*/

#ifndef PQ_H
#define PQ_H

#include "record.h"

struct pq_entry {
	size_t index;
	struct reftable_record *rec;
};

struct merged_iter_pqueue {
	struct pq_entry *heap;
	size_t len;
	size_t cap;
};

void merged_iter_pqueue_check(struct merged_iter_pqueue pq);
struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq);
void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e);
void merged_iter_pqueue_release(struct merged_iter_pqueue *pq);
int pq_less(struct pq_entry *a, struct pq_entry *b);

static inline struct pq_entry merged_iter_pqueue_top(struct merged_iter_pqueue pq)
{
	return pq.heap[0];
}

static inline int merged_iter_pqueue_is_empty(struct merged_iter_pqueue pq)
{
	return pq.len == 0;
}

#endif