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#include <ESP8266WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

const char* ssid     = "MyRicarico";
const char* password = "12341234";

//Timezone 1 * 60 *60 = 3600
const long utcOffsetInSeconds = 3600;

//Days
char days[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

//Initialize time variables
String day = "Nan" ;
int hour = 0;
int minutes = 0;
int seconds = 0;

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffsetInSeconds);

//Port 80
WiFiServer server(80);

// Var HTTP request
String header;


String reservedTime = "Nan";
String reserved = "false";
//
unsigned long currentTime = millis();

unsigned long previousTime = 0;

const long timeoutTime = 2000;

void setup() {
  Serial.begin(115200);


  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  //Initialize Web Server and Time client
  server.begin();
  timeClient.begin();
  updateTime();
}

//Sync time
void updateTime(){
  timeClient.update();
  day = days[timeClient.getDay()];
  hour = timeClient.getHours();
  minutes = timeClient.getMinutes();
  seconds = timeClient.getSeconds();
}
//clock
void systemclock() {
  seconds++;
  if(seconds>=60)
  {
    seconds=0;
    minutes++;
  }
  if(minutes>=60)
  {
    seconds=0;
    minutes=0;
    hour++;
  }
  if(hour>=25)
  {
    seconds=0;
    minutes=0;
    hour=1;

  }
  delay(1000);
}


void loop(){
  systemclock();

  WiFiClient client = server.available();   // Listen for incoming clients
  if (client) {
    Serial.println("New Client.");
    String currentLine = "";
    currentTime = millis();
    previousTime = currentTime;
    while (client.connected() && currentTime - previousTime <= timeoutTime) {
      currentTime = millis();
      if (client.available()) {
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {


          if (currentLine.length() == 0) {

            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();


            if (header.indexOf("GET /5/reserved") >= 0) {
              reservedTime = String(hour)+ ":" +String(minutes)+ ":" +String(seconds);
              reserved = "true";
              Serial.println("reserved: " + reservedTime);
            }
            if (header.indexOf("GET /5/nonReserved") >= 0) {
              reservedTime = "Nan";
              reserved = "false";
              Serial.println("reserved: " + reservedTime);
            }


            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");


            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
            client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #77878A;}</style></head>");

            // Web Page Heading
            client.println("<body><h1>ESP8266 Web Server</h1>");

            //timeDisplay
            client.println("<h1>Time & Day</h1><h3>"+String(day)+"</h3><h3>"+String(hour)+ ":" +String(minutes)+ ":" +String(seconds)+"</h3>");


            client.println("<p>Prenotazione</p>");
            if (reserved=="false") {
              client.println("<p><a href=\"/5/reserved\"><button class=\"button\">Prenota</button></a></p><h3>"+String(reservedTime)+"</h3>");
            } else {
              client.println("<p><a href=\"/5/nonReserved\"><button class=\"button button2\">Annulla</button></a></p>");
            }

            client.println("</body></html>");

            //<h3>"+String(reservedTime)+"</h3>");
            client.println();

            break;
          } else {
            currentLine = "";
          }
        } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}