// CODE BIBLIOGRAPHY
// The source for this code originally started from DIOT Lab: Sensors to Action

int knobPin = A0;
int knobReading = 0;
int mappedKnobReading = 0;


int ledPin = D2;
int ledBrightness = 0;
bool pulse_up = true;
int ledPin2 = D3;



int buttonState;
int buttonPin = D6;

//int last_button_press = -1;


int photoCellPin = A5;
int photoCellReading = -1;
//first log should be program start time
int last_photocell_log = millis();
int last_water_log = 0;
//bool sendSMS = false;

//milliseconds in a second
int cycle_start_time = millis();
int seconds = 1000;
int cycle_length = 10 * seconds;
int led_state =0;
bool button_pressed_during_cycle = false;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode( buttonPin , INPUT_PULLUP); 
}


void loop() {
      //sendSMS = false;
      photoCellReading = analogRead(photoCellPin);
      //3556 bright
      //900 pitch black
    
      pulse_led();
    
      knobReading = analogRead(knobPin);
      mappedKnobReading = map( knobReading, 0, 4095, 0, 100);
      analogWrite(ledPin, ledBrightness);
      analogWrite(ledPin2, ledBrightness);
      buttonState = digitalRead(buttonPin);
      
      
      //adjust the cycle time using the knob
      cycle_length = cycle_length * mappedKnobReading / 100;

      
      //cycle_length = cycle_length * fraction;
      
      //every x second cycle, trend the LED to it's weaker state
/*
PSUEDO CODE
cycle starts
	

during cycle
	if button pressed
		state = state + 1
		button flag = true

cycle ends
	was a button pressed during this cycle? (yes/no)
		yes - state = state
		no -  state = state -1
	reset button flag = false
	reset cycle_start_time = current_time
*/

      if (buttonState == LOW) //if you push the button down
      {
    
        if(button_pressed_during_cycle == false)
        {
            if (led_state == 2)
            {
                led_state = 2;
            }
            else
            {
             led_state = led_state + 1;
            }
            
            button_pressed_during_cycle = true;
        }
      }
      
      
      if (cycle_start_time + cycle_length < millis() )
      {
          //end of cycle
          if(button_pressed_during_cycle)
          {
              //led_state = led_state
              //only publish an event once every 60 seconds to not overload the IFTTT event handler
            	if( last_water_log == 0 or (last_water_log + cycle_length < millis()) )
            	{
            	    //recent logtime to current time
            		last_water_log = millis();
            		//publish photoreading to our spreadsheet
            		Particle.publish( "log_water", "1" );
            	}
          }
          else
          {
              if (led_state == 0)
              {
                led_state = 0;
              }
              else
              {
                led_state = led_state - 1;
              }
          }
          
          cycle_start_time = millis();
          button_pressed_during_cycle = false;
      }
      

      //publish all variables to Particle console for debugging
      Particle.variable("knobPin", knobReading);
      Particle.variable("mappedKnobPin", mappedKnobReading);
    
      Particle.variable("ledBrightness", ledBrightness);
      
      Particle.variable("button",buttonState);
      //Particle.variable("lastButtonPress",last_button_press );

      Particle.variable("photoCell", photoCellReading);
      Particle.variable("last_log_water", last_water_log);
      Particle.variable("last_log_photo", last_photocell_log);
     
      Particle.variable("led_state", led_state);
      Particle.variable("cycle_length", cycle_length);
       //Particle.variable("fraction", fraction);
      
      delay(50);
      
      //every 2 minutes, publish the photo reading to our spreadsheet
      if( last_photocell_log + 120 * seconds < millis() )
      {
         last_photocell_log = millis();
         Particle.publish( "log_photocell", String( photoCellReading  ) );
      }
      
}


///////////////////////////////////////////////////////////////////////////////////////////////

//This function pulses the led in 3 distinct visual states
void pulse_led()
{
      //LED STATE 0 is the weakest state
      if (led_state == 0)
      {
          //fixed state 
          ledBrightness = 20;
      }
      //LED STATE 1
      else if (led_state == 1)
      {
          if (ledBrightness >= 255)
          {
              pulse_up = false;
          }
          else if (ledBrightness <= 0)
          {
              pulse_up = true;
          }
          
          if (pulse_up)
          {
              ledBrightness = ledBrightness + 5;
          }
          else
          {
              ledBrightness = ledBrightness - 5;
          }
      }//LED STATE 2 is the brightest state
      else if (led_state == 2)
      {
          if (ledBrightness >= 255)
          {
              pulse_up = false;
          }
          else if (ledBrightness <= 0)
          {
              pulse_up = true;
          }
          
          if (pulse_up)
          {
              ledBrightness = ledBrightness + 40;
          }
          else
          {
              ledBrightness = ledBrightness - 40;
          }
      }
}

//The code below was part of the debugging work in progress and is not used in the current codebase

// CODE BIBLIOGRAPHY
// The source for this function originally pulled from DIOT sensors to action
/*
bool button_delay()
{
	if( last_button_press + cycle_length < millis() )
	{
		last_button_press = millis();
		return true;
	}
	else 
	{
	    return false;
	}
}
*/


// state flow goes 0 -> 1 -> 2 -> 1 -> 0
/*
void change_led_state_up()
{
    if (led_state == 0)
    {
        led_state = 1;
    }
    else if (led_state ==1)
    {
        led_state = 2;
    }
    else if (led_state ==2)
    {
        led_state = 2;
    }
}


// state flow goes 0 -> 1 -> 2 -> 1 -> 0
void change_led_state_down()
{
    if (led_state == 0)
    {
        last_led_state = 0;
        led_state = 0;
    }
    else if (led_state ==1)
    {
        if(last_led_state ==0) //if you just changed from 0 -> 1, let the cycle run at 1 once
        {
            last_led_state = 1;
            led_state = 1;  
        }
        else
        {
            last_led_state = 1;
            led_state = 0;
        }
    }
    else if (led_state ==2)
    {
        last_led_state = 2;
        led_state = 1;
    }
}
*/