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#ifndef LUX_TSL2561_H
#define LUX_TSL2561_H

#define TSL2561_VISIBLE 2                   // channel 0 - channel 1
#define TSL2561_INFRARED 1                  // channel 1
#define TSL2561_FULLSPECTRUM 0              // channel 0

// 3 i2c address options!
#define TSL2561_ADDR_LOW  0x29
#define TSL2561_ADDR_FLOAT 0x39
#define TSL2561_ADDR_HIGH 0x49

// Lux calculations differ slightly for CS package
//#define TSL2561_PACKAGE_CS
#define TSL2561_PACKAGE_T_FN_CL

#define TSL2561_READBIT           (0x01)

#define TSL2561_COMMAND_BIT       (0x80)    // Must be 1
#define TSL2561_CLEAR_BIT         (0x40)    // Clears any pending interrupt (write 1 to clear)
#define TSL2561_WORD_BIT          (0x20)    // 1 = read/write word (rather than byte)
#define TSL2561_BLOCK_BIT         (0x10)    // 1 = using block read/write

#define TSL2561_CONTROL_POWERON   (0x03)
#define TSL2561_CONTROL_POWEROFF  (0x00)

#define TSL2561_LUX_LUXSCALE      (14)      // Scale by 2^14
#define TSL2561_LUX_RATIOSCALE    (9)       // Scale ratio by 2^9
#define TSL2561_LUX_CHSCALE       (10)      // Scale channel values by 2^10
#define TSL2561_LUX_CHSCALE_TINT0 (0x7517)  // 322/11 * 2^TSL2561_LUX_CHSCALE
#define TSL2561_LUX_CHSCALE_TINT1 (0x0FE7)  // 322/81 * 2^TSL2561_LUX_CHSCALE

// T, FN and CL package values
#define TSL2561_LUX_K1T           (0x0040)  // 0.125 * 2^RATIO_SCALE
#define TSL2561_LUX_B1T           (0x01f2)  // 0.0304 * 2^LUX_SCALE
#define TSL2561_LUX_M1T           (0x01be)  // 0.0272 * 2^LUX_SCALE
#define TSL2561_LUX_K2T           (0x0080)  // 0.250 * 2^RATIO_SCALE
#define TSL2561_LUX_B2T           (0x0214)  // 0.0325 * 2^LUX_SCALE
#define TSL2561_LUX_M2T           (0x02d1)  // 0.0440 * 2^LUX_SCALE
#define TSL2561_LUX_K3T           (0x00c0)  // 0.375 * 2^RATIO_SCALE
#define TSL2561_LUX_B3T           (0x023f)  // 0.0351 * 2^LUX_SCALE
#define TSL2561_LUX_M3T           (0x037b)  // 0.0544 * 2^LUX_SCALE
#define TSL2561_LUX_K4T           (0x0100)  // 0.50 * 2^RATIO_SCALE
#define TSL2561_LUX_B4T           (0x0270)  // 0.0381 * 2^LUX_SCALE
#define TSL2561_LUX_M4T           (0x03fe)  // 0.0624 * 2^LUX_SCALE
#define TSL2561_LUX_K5T           (0x0138)  // 0.61 * 2^RATIO_SCALE
#define TSL2561_LUX_B5T           (0x016f)  // 0.0224 * 2^LUX_SCALE
#define TSL2561_LUX_M5T           (0x01fc)  // 0.0310 * 2^LUX_SCALE
#define TSL2561_LUX_K6T           (0x019a)  // 0.80 * 2^RATIO_SCALE
#define TSL2561_LUX_B6T           (0x00d2)  // 0.0128 * 2^LUX_SCALE
#define TSL2561_LUX_M6T           (0x00fb)  // 0.0153 * 2^LUX_SCALE
#define TSL2561_LUX_K7T           (0x029a)  // 1.3 * 2^RATIO_SCALE
#define TSL2561_LUX_B7T           (0x0018)  // 0.00146 * 2^LUX_SCALE
#define TSL2561_LUX_M7T           (0x0012)  // 0.00112 * 2^LUX_SCALE
#define TSL2561_LUX_K8T           (0x029a)  // 1.3 * 2^RATIO_SCALE
#define TSL2561_LUX_B8T           (0x0000)  // 0.000 * 2^LUX_SCALE
#define TSL2561_LUX_M8T           (0x0000)  // 0.000 * 2^LUX_SCALE

// CS package values
#define TSL2561_LUX_K1C           (0x0043)  // 0.130 * 2^RATIO_SCALE
#define TSL2561_LUX_B1C           (0x0204)  // 0.0315 * 2^LUX_SCALE
#define TSL2561_LUX_M1C           (0x01ad)  // 0.0262 * 2^LUX_SCALE
#define TSL2561_LUX_K2C           (0x0085)  // 0.260 * 2^RATIO_SCALE
#define TSL2561_LUX_B2C           (0x0228)  // 0.0337 * 2^LUX_SCALE
#define TSL2561_LUX_M2C           (0x02c1)  // 0.0430 * 2^LUX_SCALE
#define TSL2561_LUX_K3C           (0x00c8)  // 0.390 * 2^RATIO_SCALE
#define TSL2561_LUX_B3C           (0x0253)  // 0.0363 * 2^LUX_SCALE
#define TSL2561_LUX_M3C           (0x0363)  // 0.0529 * 2^LUX_SCALE
#define TSL2561_LUX_K4C           (0x010a)  // 0.520 * 2^RATIO_SCALE
#define TSL2561_LUX_B4C           (0x0282)  // 0.0392 * 2^LUX_SCALE
#define TSL2561_LUX_M4C           (0x03df)  // 0.0605 * 2^LUX_SCALE
#define TSL2561_LUX_K5C           (0x014d)  // 0.65 * 2^RATIO_SCALE
#define TSL2561_LUX_B5C           (0x0177)  // 0.0229 * 2^LUX_SCALE
#define TSL2561_LUX_M5C           (0x01dd)  // 0.0291 * 2^LUX_SCALE
#define TSL2561_LUX_K6C           (0x019a)  // 0.80 * 2^RATIO_SCALE
#define TSL2561_LUX_B6C           (0x0101)  // 0.0157 * 2^LUX_SCALE
#define TSL2561_LUX_M6C           (0x0127)  // 0.0180 * 2^LUX_SCALE
#define TSL2561_LUX_K7C           (0x029a)  // 1.3 * 2^RATIO_SCALE
#define TSL2561_LUX_B7C           (0x0037)  // 0.00338 * 2^LUX_SCALE
#define TSL2561_LUX_M7C           (0x002b)  // 0.00260 * 2^LUX_SCALE
#define TSL2561_LUX_K8C           (0x029a)  // 1.3 * 2^RATIO_SCALE
#define TSL2561_LUX_B8C           (0x0000)  // 0.000 * 2^LUX_SCALE
#define TSL2561_LUX_M8C           (0x0000)  // 0.000 * 2^LUX_SCALE

enum {
  TSL2561_REGISTER_CONTROL          = 0x00,
  TSL2561_REGISTER_TIMING           = 0x01,
  TSL2561_REGISTER_THRESHHOLDL_LOW  = 0x02,
  TSL2561_REGISTER_THRESHHOLDL_HIGH = 0x03,
  TSL2561_REGISTER_THRESHHOLDH_LOW  = 0x04,
  TSL2561_REGISTER_THRESHHOLDH_HIGH = 0x05,
  TSL2561_REGISTER_INTERRUPT        = 0x06,
  TSL2561_REGISTER_CRC              = 0x08,
  TSL2561_REGISTER_ID               = 0x0A,
  TSL2561_REGISTER_CHAN0_LOW        = 0x0C,
  TSL2561_REGISTER_CHAN0_HIGH       = 0x0D,
  TSL2561_REGISTER_CHAN1_LOW        = 0x0E,
  TSL2561_REGISTER_CHAN1_HIGH       = 0x0F
};

typedef enum {
  TSL2561_INTEGRATIONTIME_13MS      = 0x00,    // 13.7ms
  TSL2561_INTEGRATIONTIME_101MS     = 0x01,    // 101ms
  TSL2561_INTEGRATIONTIME_402MS     = 0x02     // 402ms
} tsl2561IntegrationTime_t;

typedef enum {
  TSL2561_GAIN_0X                   = 0x00,    // No gain
  TSL2561_GAIN_16X                  = 0x10     // 16x gain
} tsl2561Gain_t;

typedef struct __TSL25611_DATA {
    uint8_t address;
    tsl2561IntegrationTime_t integration;
    tsl2561Gain_t gain;
} TSL2561_DATA;

void TSL2561_Init(uint8_t address);
void TSL2561_Enable(void);
void TSL2561_Disable(void);
void TSL2561_Set_Timing(tsl2561IntegrationTime_t integration);
void TSL2561_Set_Gain(tsl2561Gain_t gain);
uint32_t TSL2561_Calculate_Lux(uint16_t ch0, uint16_t ch1);
uint32_t TSL2561_Get_Full_Luminosity(void);
uint16_t TSL2561_Get_Luminosity(uint8_t channel);

void TSL2561_Write_2_Bytes(uint8_t reg, uint8_t value);
uint16_t TSL2561_Read_2_Bytes(uint8_t reg);

#endif  /* LUX_TSL2561_H */