#include <Arduino.h>
#include "LedControl.h"
#include "RTClib.h"           // RTC library

#include <ESP8266WiFi.h> //https://github.com/esp8266/Arduino
#include <ESP8266WebServer.h>
#include "WiFiManager.h" //https://github.com/tzapu/WiFiManager

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

/*

Now we need a LedControl to work with.
***** These pin numbers will probably not work with your hardware *****

pin 12 is connected to the DataIn

pin 11 is connected to the CLK

pin 10 is connected to LOAD

We have only a single MAX72XX.

*/


int iteration = 0;




// initialize RTC library
RTC_DS1307 rtc;
DateTime   now;

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     D8-1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


// Max7219 PINs:
#define MAX_CLK D5
#define MAX_CS  D3
#define MAX_DIN D7

LedControl lc = LedControl(MAX_DIN, MAX_CLK, MAX_CS, 1);

/* we always wait a bit between updates of the display */

unsigned long delaytime = 500;

void configModeCallback(WiFiManager *myWiFiManager);

void setup()
{
Serial.begin(115200);
//WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;
  //reset settings - for testing
  //wifiManager.resetSettings();

  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
  wifiManager.setAPCallback(configModeCallback);

  

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect())
  {
    Serial.println("failed to connect and hit timeout");
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(1000);
  }

  

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");


  /* The MAX72XX is in power-saving mode on startup, we have to do a wakeup call */

  lc.shutdown(0, false);

  /* Set the brightness to a medium values */

  lc.setIntensity(0, 15);

  lc.clearDisplay(0);

  /* and clear the display */


    

    Serial.println("starting");
 
  delay(3000); // wait for console opening

  //rtc.begin();
 
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    //while (1);
    return;
  }
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

    // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    return;
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();




}

void configModeCallback(WiFiManager *myWiFiManager)
{
  Serial.println("Entered config mode");
  Serial.println(WiFi.softAPIP());
  //if you used auto generated SSID, print it
  Serial.println(myWiFiManager->getConfigPortalSSID());
}


void printNumber(int v) {
    int ones;
    int tens;
    int hundreds;
    boolean negative;	

    if(v < -999 || v > 999) 
       return;
    if(v<0) {
        negative=true;
        v=v*-1;
    }
    ones=v%10;
    v=v/10;
    tens=v%10;
    v=v/10;
    hundreds=v;			
    if(negative) {
       //print character '-' in the leftmost column	
       lc.setChar(0,3,'-',false);
    }
    else {
       //print a blank in the sign column
       lc.setChar(0,3,' ',false);
    }
    //Now print the number digit by digit
    lc.setDigit(0,2,(byte)hundreds,false);
    lc.setDigit(0,1,(byte)tens,false);
    lc.setDigit(0,0,(byte)ones,false);
}




void loop()
{

DateTime now = rtc.now();
 
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();
 
    Serial.print(" since midnight 1/1/1970 = ");
    Serial.print(now.unixtime());
    Serial.print("s = ");
    Serial.print(now.unixtime() / 86400L);
    Serial.println("d");
 
    // calculate a date which is 7 days and 30 seconds into the future
    DateTime future (now + TimeSpan(7,12,30,6));
 
    Serial.print(" now + 7d + 30s: ");
    Serial.print(future.year(), DEC);
    Serial.print('/');
    Serial.print(future.month(), DEC);
    Serial.print('/');
    Serial.print(future.day(), DEC);
    Serial.print(' ');
    Serial.print(future.hour(), DEC);
    Serial.print(':');
    Serial.print(future.minute(), DEC);
    Serial.print(':');
    Serial.print(future.second(), DEC);
    Serial.println();
 
    Serial.println();


  display.clearDisplay();

  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font


  char buffer[20];

  sprintf(buffer, "%02d:%02d:%02d %02d/%02d/%02d",  now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());

  display.write(buffer);

  display.display();


  lc.setDigit(0,3,now.hour()/10,false);
  lc.setDigit(0,2,now.hour()%10,false);
  lc.setDigit(0,1,now.minute()/10,false);
  lc.setDigit(0,0,now.minute()%10,false);

/*
  lc.setDigit(0,0,3,false);
  lc.setDigit(0,1,2,false);
  lc.setDigit(0,2,1,false);
  lc.setDigit(0,3,0,false);
*/
  delay(1000);

}