#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <ESP8266WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>


struct Button {
    const uint8_t PIN;
    uint32_t numberKeyPresses;
    bool pressed;
};

Button button1 = {D6, 0, false};

unsigned long previousMillis = 0;       // will store last time was updated
// constants won't change:
const long interval = 10000;           // interval at which to delay (milliseconds)

//variables to keep track of the timing of recent interrupts
unsigned long button_time = 0;  
unsigned long last_button_time = 0; 

void ICACHE_RAM_ATTR isr() {
    button_time = millis();
if (button_time - last_button_time > 250)
{
        button1.numberKeyPresses++;
        button1.pressed = true;
        last_button_time = button_time;
}
}

// Replace with your network credentials
const char* ssid = "user";
const char* password = "pass";

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");
//BME
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme;
float temperature, humidity, pressure, altitude;
float mintemperature, minpressure, maxtemperature, maxpressure ;
//OLED
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("SERIAL OK");
  
//Interrupt
  pinMode(button1.PIN, INPUT_PULLUP);
  attachInterrupt(button1.PIN, isr, FALLING);

// Connect to Wi-Fi
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

// Initialize a NTPClient to get time
  timeClient.begin();
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
  timeClient.setTimeOffset(7200);


  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  bme.begin(0x76);   
  display.display();
  delay(2000); // Pause for 2 seconds
  mintemperature = bme.readTemperature();
  minpressure =    bme.readPressure() / 100.0F + 21;
  maxtemperature = mintemperature; 
  maxpressure = minpressure;
  
}

void loop() {
   if (button1.pressed) {
        Serial.printf("Button has been pressed %u times\n", button1.numberKeyPresses);
        button1.pressed = false;
  display.clearDisplay();
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  display.println("MINISTANICE PHRUB");
  display.println("-----------------");
  display.print("Min. teplota: "); 
  display.println(mintemperature); 
  display.print("Max. teplota: "); 
  display.println(maxtemperature); 
  display.print("Min. tlak: "); 
  display.println(minpressure); 
  display.print("Max. tlak: "); 
  display.println(maxpressure); 
  display.println("-----------------");
  display.display();    
  delay(1000);  
  }
    
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;
    
  timeClient.update();  
  String formattedTime = timeClient.getFormattedTime();
  time_t epochTime = timeClient.getEpochTime();
  //Serial.print("Epoch Time: ");
  //Serial.println(epochTime);
  //Get a time structure
  struct tm *ptm = gmtime ((time_t *)&epochTime); 
  int monthDay = ptm->tm_mday;
  int currentMonth = ptm->tm_mon+1;
  int letCas= ptm->tm_isdst;
  //Serial.print("Letni cas: ");
  //Serial.println(letCas);
  
  //String currentMonthName = months[currentMonth-1];
  //Serial.print("Month name: ");
  //Serial.println(currentMonthName);
  int currentYear = ptm->tm_year+1900;
  //Print complete date:
  String currentDate = String(currentYear) + "-" + String(currentMonth) + "-" + String(monthDay);
  Serial.print("Current date: ");
  Serial.println(currentDate);
  
  temperature = bme.readTemperature();
  humidity = bme.readHumidity();
  pressure = bme.readPressure() / 100.0F + 21;
  if (mintemperature>temperature){mintemperature = temperature;}
  if (maxtemperature<temperature){maxtemperature = temperature;}
  if (minpressure>pressure){minpressure = pressure;}
  if (maxpressure<pressure){maxpressure = pressure;}
  
  altitude = bme.readAltitude(SEALEVELPRESSURE_HPA);
  display.clearDisplay();
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  display.println("MINISTANICE PHRUB");
  display.println("-----------------");
  display.print("Teplota:  ");
  display.print(temperature);
  display.println(" C");
  display.print("Vlhkost:  ");
  display.print(humidity);
  display.println("%");
  display.print("Tlak:     ");
  display.print(pressure);
  display.println(" hPa");
  display.println("------------------");
  display.print("Time:     ");
  display.println(formattedTime);
  display.print("Date:     ");
  display.println(currentDate);
   
  display.display();
  }
  //delay(10000);
}