#ifndef BATT_MGMT_H
#define BATT_MGMT_H

#include <zephyr/types.h>
#include <stdbool.h>

#define BATT_MGMT_OVERSAMPLING_8X 8U
#define BATT_MGMT_OVERSAMPLING_16X 16U

typedef enum {
	BATT_STATE_DISCHARGING = 0,
	BATT_STATE_FULL,
	BATT_STATE_CHARGING,
	BATT_STATE_ERROR,
	BATT_STATE_UNKNOWN,
} batt_mgmt_state_t;

typedef struct {
	batt_mgmt_state_t state;
	uint8_t level;
	uint8_t percent;
	int32_t voltage_mv;
} batt_mgmt_info_t;

/**
 * @brief Measure battery VDDH voltage.
 *
 * @param oversampling Oversampling factor (BATT_MGMT_OVERSAMPLING_8X or BATT_MGMT_OVERSAMPLING_16X).
 * @param vddh_mv Pointer to store the result in millivolts.
 * @return 0 on success, negative errno on failure.
 */
int batt_mgmt_measure_vddh_mv(uint8_t oversampling, int32_t *vddh_mv);

/**
 * @brief Get display voltage in millivolts.
 *
 * Returns the voltage value intended for UI/protocol display. Currently this is
 * the latest measured VDDH value cached by batt_mgmt.
 *
 * @param vddh_mv Pointer receiving display voltage in mV.
 * @return 0 on success, negative errno on failure.
 */
int batt_mgmt_get_display_voltage_mv(int32_t *vddh_mv);

/**
 * @brief Get battery level bucket (0..4) from configured thresholds.
 *
 * Level mapping:
 * - 0: below 20% threshold
 * - 1: 20%..49%
 * - 2: 50%..79%
 * - 3: 80%..99%
 * - 4: full and above
 *
 * @param level Pointer receiving level in range 0..4.
 * @return 0 on success, negative errno on failure.
 */
int batt_mgmt_get_battery_level(uint8_t *level);

/**
 * @brief Get battery percentage (0-100) from configured voltage thresholds.
 *
 * Uses piecewise linear interpolation over:
 * - EMPTY..20%
 * - 20%..50%
 * - 50%..80%
 * - 80%..FULL
 *
 * @param percent Pointer receiving percentage in range 0..100.
 * @return 0 on success, negative errno on failure.
 */
int batt_mgmt_get_battery_percent(uint8_t *percent);

/**
 * @brief Get raw charger status (GPIO level).
 *
 * Returns the current logic level of the charger status pin (typically from ETA6003).
 * This is the **raw GPIO status**, not a processed state machine result.
 *
 * @return true if charger pin is high (e.g., battery is "charging"), false if low.
 */
bool batt_mgmt_get_charger_status(void);

/**
 * @brief Get processed battery state with blinking detection.
 *
 * Returns a derived state based on:
 * - USB VBUS presence (from usb_mgmt)
 * - Charger status GPIO level (from batt_mgmt_get_charger_status)
 * - Blinking detection (state changes within CONFIG_BATT_MGMT_CHG_BLINKING_WINDOW_MS)
 *
 * Note: This differs from batt_mgmt_get_charger_status() which returns the **raw** GPIO level.
 *
 * @return Battery state enum (DISCHARGING, FULL, CHARGING, or ERROR if blinking detected).
 */
batt_mgmt_state_t batt_mgmt_get_battery_state(void);

/**
 * @brief Get all battery information in one call.
 *
 * @param info Pointer receiving state, level (0..4), percent (0..100), and voltage in mV.
 * @return 0 on success, negative errno on failure.
 */
int batt_mgmt_get_info(batt_mgmt_info_t *info);

#endif