#ifndef TSL2591_H_INCLUDED
#define TSL2591_H_INCLUDED

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

#define TSL2591_ADDRESS (0x29)
#define TSL2591_COMMAND_BIT (0xA0)

typedef enum TSL2591Register {
    TSL2591_REGISTER_ENABLE = 0x00,
    TSL2591_REGISTER_CONTROL = 0x01,
    TSL2591_REGISTER_DEVICE_ID = 0x12,
    TSL2591_REGISTER_CHAN0_LOW = 0x14,
    TSL2591_REGISTER_CHAN1_LOW = 0x16,
} TSL2591Register;

typedef enum TSL2591Control {
    TSL2591_CONTROL_INTEGRATIONTIME_100MS = 0x00,
    TSL2591_CONTROL_INTEGRATIONTIME_200MS = 0x01,
    TSL2591_CONTROL_INTEGRATIONTIME_300MS = 0x02,
    TSL2591_CONTROL_INTEGRATIONTIME_400MS = 0x03,
    TSL2591_CONTROL_INTEGRATIONTIME_500MS = 0x04,
    TSL2591_CONTROL_INTEGRATIONTIME_600MS = 0x05,
    TSL2591_CONTROL_GAIN_LOW = 0x00,
    TSL2591_CONTROL_GAIN_MEDIUM = 0x10,
    TSL2591_CONTROL_GAIN_HIGH = 0x20,
    TSL2591_CONTROL_GAIN_MAX = 0x30
} TSL2591Control;

typedef enum TSL2591Enable {
    TSL2591_ENABLE_POWEROFF = 0x00,
    TSL2591_ENABLE_POWERON = 0x01,
    TSL2591_ENABLE_AEN = 0x02,
    TSL2591_ENABLE_AIEN = 0x10,
    TSL2591_ENABLE_NPIEN = 0x80,
} TSL2591Enable;

inline uint16_t make_le_16(uint16_t val) { return (val >> 8) | (val << 8); }

bool tsl2591_init();
void tsl2591_set_gain(TSL2591Control gain);
void tsl2591_set_integration_time(TSL2591Control integration_time);
uint16_t tsl2591_get_visible_light_reading();

#endif // TSL2591_H_INCLUDED