/*
 * Based on
 * https://github.com/OLIMEX/ESP32-POE/blob/master/SOFTWARE/ARDUINO/ESP32_PoE_WebServer_Demo/ESP32_PoE_WebServer_Demo.ino
 * https://github.com/OLIMEX/ESP32-POE/blob/master/SOFTWARE/ARDUINO/ESP32_PoE_MOD_BME280/ESP32_PoE_MOD_BME280.ino
*/

#include <ETH.h>
#include <WebServer.h>
#include <ESPmDNS.h>
#include <Wire.h>
#include "Adafruit_BME280.h"

#define SEALEVELPRESSURE_HPA (1013.25)  // required for MOD-BME280

Adafruit_BME280 bme; // I2C

static bool eth_connected = false;
char Buff[100];
float Temperature, Pressure, Altitude, Humidity;
WebServer server(80);

// Web Server: handle a request to / (root of the server)
void handleRoot() {
  String response = "PoE Sensor Board\n";
  response += "Available URLs\n/temperature\n/humidity\n/pressure\n/altitude\n/api";
  server.send(200, "text/plain", response);
}

// Web Server: handle a request to an unknown URI (unknown "File")
void handleNotFound() {
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}



// Initializing everything at start up / after reset:
void setup()
{
  // Wait for the hardware to initialize:
  delay(500);

  // This sketch will log some information to the serial console:


  Serial.begin(115200); // Assuming computer will be connected to serial port at 115200 bauds
  Serial.print("Setup...");
  
  // Add a handler for network events. This is misnamed "WiFi" because the ESP32 is historically WiFi only,
  // but in our case, this will react to Ethernet events.
  Serial.print("Registering event handler for ETH events...");

  
  // Starth Ethernet (this does NOT start WiFi at the same time)
  Serial.print("Starting ETH interface...");
  ETH.begin();


  // Web Server handlers: 
  // Handle a request to / (root of the server)
  server.on("/", handleRoot);
  // Minimalistic handling of another URI:
    server.on("/temperature", []() {
    get_temperature();
    server.send(200, "text/plain", String(Temperature));
  });
  server.on("/pressure", []() {
    get_pressure();
    server.send(200, "text/plain", String(Pressure));
  });
  server.on("/humidity", []() {
    get_humidity();
    server.send(200, "text/plain", String(Humidity));
  });
  server.on("/altitude", []() {
    get_altitude();
    server.send(200, "text/plain", String(Altitude));
  });
  server.on("/api", []() {
    get_temperature();
    get_humidity();
    get_pressure();
    get_altitude();
    String response ="{\n";
    response += "\"temperature\":" + String(Temperature) + ",\n";
    response += "\"humidity\":" + String(Humidity) + ",\n";
    response += "\"pressure\":" + String(Pressure) + ",\n";
    response += "\"altitude\":" + String(Altitude) + ",\n";
    response += "}";
    server.send(200, "text/json", response);
  });
  // Handle all other URIs:
  server.onNotFound(handleNotFound);

  server.begin();
  Serial.println("HTTP server started");
  
  Wire.begin (13, 16);  // init I2C on the respective pins
  bme.begin(0x77);
  get_sensors();
}

void get_temperature ()
{
  Temperature = bme.readTemperature();
}

void get_pressure ()
{
  Pressure = bme.readPressure() / 100.0F;
}

void get_altitude ()
{
  Altitude = bme.readAltitude(SEALEVELPRESSURE_HPA);
}

void get_humidity ()
{
  Humidity = bme.readHumidity();
}

void get_sensors ()
{
  get_temperature();
  get_pressure();
  get_altitude();
  get_humidity();
  sprintf (Buff, "Temperature = %.2f C\nPressure = %.2f hPa\nAltitude = %.2f m\nHumidity = %.2f %%\n\n\n", Temperature, Pressure, Altitude, Humidity);
  Serial.print (Buff);
}

void loop ()
{
  server.handleClient();
  delay(2);//allow the cpu to switch to other tasks
}