/* pipeline.h - adaptive request window based on observed bandwidth-delay product. */
#ifndef NAUT_PIPELINE_H
#define NAUT_PIPELINE_H

#include "naut/common.h"

typedef struct {
    double rtt_seconds;
    double bytes_per_second;
    double last_sample_at;
    uint32_t depth;
    uint32_t min_depth;
    uint32_t max_depth;
    uint32_t block_size;
} naut_pipeline;

void naut_pipeline_init(naut_pipeline *p, uint32_t block_size,
                        uint32_t min_depth, uint32_t max_depth,
                        uint32_t initial_depth);

/* Record one completed request. sent_at and received_at are monotonic seconds.
 * The controller smooths RTT and delivery rate, then targets 2x BDP to absorb
 * scheduling jitter without allowing an unbounded request window. */
void naut_pipeline_on_block(naut_pipeline *p, uint32_t bytes,
                            double sent_at, double received_at);

uint32_t naut_pipeline_depth(const naut_pipeline *p);

#endif /* NAUT_PIPELINE_H */