/*
    Digital_Light_ISL29035.cpp
    A library for ISL29035

    Copyright (c) 2017 seeed technology inc.
    Website    : www.seeed.cc
    Author     : Jack
    Create Time:
    Change Log :

    The MIT License (MIT)

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/
#include <Digital_Light_ISL29035.h>
#include <Wire.h>

DigitalLightISL29035::DigitalLightISL29035():
    _full_scale_lux_range(DEFAULT_LUX_RANGE_INDEX),
    _integration_time(DEFAULT_INTEGRATION_TIME_INDEX) {
    _adc_count_max[0] = 65536;
    _adc_count_max[1] = 4096;
    _adc_count_max[2] = 256;
    _adc_count_max[3] = 16;

    _intg_time[0] = INTEGRATION_TIME0;
    _intg_time[1] = INTEGRATION_TIME1;
    _intg_time[2] = INTEGRATION_TIME2;
    _intg_time[3] = INTEGRATION_TIME3;

    _ranges[0] = FULL_SCALE_LUX_RANGE0;
    _ranges[1] = FULL_SCALE_LUX_RANGE1;
    _ranges[2] = FULL_SCALE_LUX_RANGE2;
    _ranges[3] = FULL_SCALE_LUX_RANGE3;
}

uint8_t DigitalLightISL29035::readRegister(int device_address, int reg_address) {
    uint8_t value;
    Wire.beginTransmission(device_address);
    Wire.write(reg_address);
    Wire.endTransmission(false);
    Wire.requestFrom(device_address, 1);
    //while(!Wire.available());
    value = Wire.read();
    return value;
}

void DigitalLightISL29035::writeRegister(int device_address, int reg_address, uint8_t val) {
    Wire.beginTransmission(device_address);
    Wire.write(reg_address);
    Wire.write(val);
    Wire.endTransmission();
}

int DigitalLightISL29035::init() {
    uint8_t reg = readRegister(ISL29035_I2C_ADDRESS, CHIP_ID);
    //Serial.println(reg, HEX);
    uint8_t chip_id = (reg >> 3) & 0x7;
    if (chip_id != 0x5) {
        return -1;
    }

    //clear the BOUT bit
    writeRegister(ISL29035_I2C_ADDRESS, CHIP_ID, reg & 0x7f);

    //ensure the chip is under stop mode
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_I, 0);

    //set the default full scale lux range, and the integration time
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_II, _full_scale_lux_range | (_integration_time << 2));

    return 0;
}

int DigitalLightISL29035::setFullScaleLuxRangeIndex(int range_index) {
    if (range_index < 0 || range_index > 3) {
        return -1;
    }
    _full_scale_lux_range = range_index;
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_II, _full_scale_lux_range | (_integration_time << 2));

    return 0;
}

int DigitalLightISL29035::setIntegrationTimeIndex(int intg_time_index) {
    if (intg_time_index < 0 || intg_time_index > 3) {
        return -1;
    }
    _integration_time = intg_time_index;
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_II, _full_scale_lux_range | (_integration_time << 2));

    return 0;
}

void DigitalLightISL29035::test() {
    #if 0
    uint8_t value;
    Wire.beginTransmission(ISL29035_I2C_ADDRESS);
    Wire.write(0);
    Wire.endTransmission();
    Wire.requestFrom(ISL29035_I2C_ADDRESS, 8);
    while (!Wire.available());
    for (int i = 0; i < 8; i++) {
        Serial.print("reg ");
        Serial.print(i);
        Serial.print(": 0x");
        Serial.println(Wire.read(), HEX);
    }
    value = readRegister(ISL29035_I2C_ADDRESS, CHIP_ID);
    Serial.print("reg 0xf: 0x");
    Serial.println(value, HEX);
    #endif
}


uint16_t DigitalLightISL29035::readData() {
    uint8_t l, h;
    Wire.beginTransmission(ISL29035_I2C_ADDRESS);
    Wire.write(DATA_L);
    Wire.endTransmission(false);
    Wire.requestFrom(ISL29035_I2C_ADDRESS, 2);
    while (Wire.available() < 2);
    l = Wire.read();
    h = Wire.read();

    return (h << 8) | l;
}

uint16_t DigitalLightISL29035::measure(uint8_t what) {
    //start
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_I, what);
    float time = _intg_time[_integration_time];
    if (time < 1.0f) {
        delayMicroseconds((int)(time * 1000));
    } else {
        delay((int)(time + 1.5f));
    }
    uint16_t data = readData();
    //stop
    writeRegister(ISL29035_I2C_ADDRESS, COMMAND_I, 0);
    return data;
}

uint32_t DigitalLightISL29035::readVisibleLux() {
    uint16_t data = measure(OPMODE_ALS_ONCE);
    return ((uint32_t)_ranges[_full_scale_lux_range]) * (uint32_t)data / _adc_count_max[_integration_time];
}

uint32_t DigitalLightISL29035::readIRLux() {
    uint16_t data = measure(OPMODE_IR_ONCE);
    return ((uint32_t)_ranges[_full_scale_lux_range]) * (uint32_t)data / _adc_count_max[_integration_time];
}

int32_t DigitalLightISL29035::readEV() {
    uint16_t data1 = measure(OPMODE_ALS_ONCE);
    uint16_t data2 = measure(OPMODE_IR_ONCE);

    float k = 0.82;
    float beta = -11292.86f;
    if (_integration_time > 1) {
        beta = 2137.14f;
    }
    return (int32_t)(k * data1 + data2 / beta);
}


DigitalLightISL29035 ISL29035;