#include <ESP8266WiFi.h>
#include <Wire.h> 

#include "config.h"
#include "Adafruit_TSL2561_U.h"

// ----------- DEFINES ---------------
#define LUX_ID 0x39     // I2C-Id of the lux-sensor

// ----------- GLOBALS ---------------
WiFiClient espClient;

Adafruit_TSL2561_Unified tsl = Adafruit_TSL2561_Unified(0x39, 12345);

void connectWifi() {
  WiFi.disconnect(false);
  Serial.printf("Wi-Fi mode set to WIFI_STA: %s\n", WiFi.mode(WIFI_STA) ? "Ok" : "Failed!");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  Serial.print("Connecting to ");Serial.println(WIFI_SSID);
  
  while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(WiFi.status());
      Serial.print(".\r\n");
      //WiFi.printDiag(Serial);
  }
  
  Serial.println("");
  Serial.print("Connected with IP: "),
  Serial.println(WiFi.localIP());
  Serial.printf("\n");
}


void setup() {
  Serial.begin(38400); //Opens USB-Serial connection for terminal
  delay(1000);
  Serial.println("Init of WiFi-Lux-sensor project");
  //connectWifi();
  Wire.begin(4, 5); // sda on pin D2, scl on pin D1

  tsl.begin();

  Serial.println("Set gain.");
  // You can change the gain on the fly, to adapt to brighter/dimmer light situations
  tsl.setGain(TSL2561_GAIN_1X);    // 1x gain (bright light)
  //tsl.setGain(TSL2591_GAIN_MED);      // 25x gain
  //tsl.setGain(TSL2591_GAIN_HIGH);   // 428x gain
  
  // Changing the integration time gives you a longer time over which to sense light
  // longer timelines are slower, but are good in very low light situtations!
  tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_13MS);  // shortest integration time (bright light)
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_200MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_300MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_400MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_500MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_600MS);  // longest integration time (dim light)

  tsl.enableAutoRange(true);
}

uint32_t readLuxSensor(void)
{
  uint16_t broadband;
  uint16_t ir;
  
  tsl.getLuminosity(&broadband, &ir);
  uint32_t lux = tsl.calculateLux(broadband, ir);
  Serial.printf("Lux:%u  ", lux);

  Serial.print("[ "); Serial.print(millis()); Serial.print(" ms ] ");
  Serial.print("IR: "); Serial.print(ir);  Serial.print("  ");
  Serial.print("broadband: "); Serial.print(broadband); Serial.print("  ");
  Serial.print("Visible: "); Serial.print(broadband - ir); Serial.println("  ");
  
  
  
  if ( (lux > 4294966000.0) ||
       (lux <-4294966000.0) )
  {
    return 0;
  }
  else {
    return lux;
  }
}

unsigned int readI2CRegister16bit(int addr, int reg) {
  Wire.beginTransmission(addr);
  Wire.write(reg);
  Wire.endTransmission();
  delay(200);
  Wire.requestFrom(addr, 2);
  unsigned int t = Wire.read() << 8;
  t = t | Wire.read();
  return t;
}


void loop() {
  // put your main code here, to run repeatedly:
  byte error, address;


  //unsigned int value = readI2CRegister16bit(0x39, 0xAC);

  //Serial.printf("Value:%u\n", value);
  
  /*
  Serial.print("WiFi heartbeat - ms since boot: ");
  Serial.print(millis());
  Serial.println();
  */

  readLuxSensor();
 
  delay(1000);
  
}