// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "AiEsp32RotaryEncoder.h"

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SHUTTER_PIN 13
#define SHUTTER_OPEN 255
#define SHUTTER_CLOSED 0

#define ROTARY_ENCODER_A_PIN 32
#define ROTARY_ENCODER_B_PIN 35
#define ROTARY_ENCODER_BUTTON_PIN 25
#define ROTARY_ENCODER_VCC_PIN -1 /* 27 put -1 of Rotary encoder Vcc is connected directly to 3,3V; else you can use declared output pin for powering rotary encoder */

//depending on your encoder - try 1,2 or 4 to get expected behaviour
//#define ROTARY_ENCODER_STEPS 1
//#define ROTARY_ENCODER_STEPS 2
#define ROTARY_ENCODER_STEPS 4

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

TimeSpan exposureTime = TimeSpan(0);
TimeSpan exposureDuration = TimeSpan(0);

AiEsp32RotaryEncoder durationEncoder = AiEsp32RotaryEncoder(ROTARY_ENCODER_A_PIN, ROTARY_ENCODER_B_PIN, ROTARY_ENCODER_BUTTON_PIN, ROTARY_ENCODER_VCC_PIN, ROTARY_ENCODER_STEPS);

void IRAM_ATTR readEncoderISR()
{
	durationEncoder.readEncoder_ISR();
}

void setup () {
 Serial.begin(115200);
 Serial.println("hello");
 if (! rtc.begin()) {
   Serial.println("Couldn't find RTC");
   while (1);
 }
 if (! rtc.isrunning()) {
   Serial.println("RTC is NOT running!");
   // following line sets the RTC to the date & time this sketch was compiled
   rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
   // This line sets the RTC with an explicit date & time, for example to set
   // January 21, 2014 at 3am you would call:
   // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
 } else {
   Serial.println("RTC started successfully");
 }

 if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(2, 2);
  // Display static text
  display.println("starting...");
  display.display(); 
  pinMode(SHUTTER_PIN, OUTPUT);
 

 	durationEncoder.begin();
	durationEncoder.setup(readEncoderISR);
  bool circleValues = true;
	durationEncoder.setBoundaries(0, 86400, circleValues); //minValue, maxValue, circleValues true|false (when max go to min and vice versa)
	durationEncoder.setAcceleration(25000); //or set the value - larger number = more accelearation; 0 or 1 means disabled acceleration

}

boolean shouldBeOpen(TimeSpan time) {
  int exposureTimeSeconds =  exposureTime.totalseconds();
  int timeSeconds = time.totalseconds();
  int exposureDurationSeconds = exposureDuration.totalseconds();
  return exposureTime.totalseconds() > time.totalseconds() && exposureTime.totalseconds() + exposureDuration.totalseconds() < time.totalseconds();
  
}

void doScreenStuff (TimeSpan now) {
  display.clearDisplay();
  display.setCursor(0,2);
  display.print(" Time: ");
  display.print(now.hours());
  display.print(":");
  display.print(now.minutes());
  display.print(":");
  display.println(now.seconds());

  display.print(" Shoot: ");
  display.print(exposureTime.hours());
  display.print(":");
  display.print(exposureTime.minutes());
  display.print(":");
  display.println(exposureTime.seconds());

  display.print(" Duration: ");
  display.print(exposureDuration.hours());
  display.print(":");
  display.print(exposureDuration.minutes());
  display.print(":");
  display.println(exposureDuration.seconds());
  display.print(" Shutter: ");
  display.println(shouldBeOpen(now) ? "open" : "closed");
  display.display();

}

void encoderLoop(){
  if (durationEncoder.encoderChanged())
	{
    exposureDuration = TimeSpan(durationEncoder.readEncoder());
	}

}



void loop () {
 DateTime now = rtc.now();
 TimeSpan time = TimeSpan(0, now.hour(), now.minute(), now.second());
 encoderLoop();

 doScreenStuff(time);
 
  
}