#ifndef COULOMB_COUNTER_H
#define COULOMB_COUNTER_H

/*
 * coulomb_counter.h — Battery coulomb counter for SoC estimation (Issue #325)
 *
 * Integrates battery current over time to track Ah consumed and remaining.
 * Provides accurate SoC independent of load, with fallback to voltage.
 *
 * Usage:
 *   1. Call coulomb_counter_init(capacity_mah) at startup
 *   2. Call coulomb_counter_accumulate(current_ma) at 50–100 Hz
 *   3. Call coulomb_counter_get_soc_pct() to get current SoC
 *   4. Call coulomb_counter_reset() on charge complete
 */

#include <stdint.h>
#include <stdbool.h>

/* Initialize coulomb counter with battery capacity (mAh). */
void coulomb_counter_init(uint16_t capacity_mah);

/*
 * Accumulate coulomb from current reading + elapsed time.
 * Call this at regular intervals (e.g., 50–100 Hz from telemetry loop).
 * current_ma: battery current in milliamps (positive = discharge)
 */
void coulomb_counter_accumulate(int16_t current_ma);

/* Get current SoC as percentage (0–100, 255 = error). */
uint8_t coulomb_counter_get_soc_pct(void);

/* Get consumed mAh (total charge removed from battery). */
uint16_t coulomb_counter_get_consumed_mah(void);

/* Get remaining capacity in mAh. */
uint16_t coulomb_counter_get_remaining_mah(void);

/* Reset accumulated coulombs (e.g., on charge complete). */
void coulomb_counter_reset(void);

/* Check if coulomb counter is active (initialized and has measurements). */
bool coulomb_counter_is_valid(void);

#endif /* COULOMB_COUNTER_H */