#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

//TemperaturSensor
#include "DHT.h"
#define DHT_TYPE DHT22

//WaterLevelSensor
#define waterlevel_pin D2
#define waterlevelread_pin A0

//moistureSensor
#define moisture_pin D3

//pump
#define pump D8

// Value for storing water level
int val = 0;
int test = 0;

//Temperature and humidity sensor
const int DHT_PIN = D5;
DHT dht(DHT_PIN, DHT_TYPE);

//Wlan configuration
const char* ssid = "Andy";
const char* password = "AndyNicoChiara";

//api and host configuration
const char* serverName = "http://192.168.178.45:8000/api/";
String hostname = "ESP8266NodeTemperature1";


//Konstante für die ZEit
const int timer = 30;

//----------------------------------------------------------------

void setup() {
   Serial.begin(9600);

   //temperature and humidity sensor
   dht.begin();
   delay(1000);

   //Waterlevel sensor
   pinMode(waterlevel_pin, OUTPUT);
   digitalWrite(waterlevel_pin, LOW);
   //pump
   pinMode(pump, OUTPUT);
   digitalWrite(pump, LOW);
   
   delay(2000);

   //Wifi setup
   WiFi.setHostname(hostname.c_str()); //define hostname
   WiFi.begin(ssid, password);
   Serial.println("Connecting");
   while(WiFi.status() != WL_CONNECTED) {
     delay(500);
     Serial.print(".");
   }
   Serial.println("");
   Serial.print("Connected to WiFi network with IP Address: ");
   Serial.println(WiFi.localIP());

   while(!Serial);
   Serial.println("Waking up ...");

   test = initiate(hostname);
   if (test == 0){
    exit;
   }
    
}

//----------------------------------------------------------------
void loop() {
  //temperature sensor
  float temperature = dht.readTemperature();
  Serial.print("Temperatur: ");
  Serial.print(temperature);
  Serial.println("°C");
  delay(1000);

  //humidity sensor
  float humidity = dht.readHumidity();
  Serial.print("Luftfeuchtigkeit: "); 
  Serial.print(humidity);
  Serial.println("%");

  //waterlevel sensor
  int waterlevel = readSensor();
  Serial.print("Water level: ");
  Serial.println(waterlevel);

  //moisture sensor
  float moisture = analogRead(moisture_pin);
  Serial.print("MOISTURE LEVEL : ");
  Serial.println(moisture);
  //pump  if moisture level is lower than a certain threshold
  

  if(WiFi.status()== WL_CONNECTED){
//----------------------------------------------------------------
    DynamicJsonDocument doc(2048);
    // Add values in the document
    doc["hostname"] = String(hostname);
    doc["temperature"] = String(temperature);
    doc["humidity"] = String(humidity);

    String requestBody;
    serializeJson(doc, requestBody);
    Serial.println(requestBody);

    postRequest(requestBody, "temperature/");
    doc.clear();
//----------------------------------------------------------------
    // Add values in the document
    doc["hostname"] = String(hostname);
    doc["waterlevel"] = String(waterlevel);

    requestBody = "";
    serializeJson(doc, requestBody);
    Serial.println(requestBody);
    postRequest(requestBody, "waterlevel/");
    doc.clear();

//----------------------------------------------------------------
    // Add values in the document
    doc["hostname"] = String(hostname);
    doc["moisture"] = String(moisture);

    requestBody = "";
    serializeJson(doc, requestBody);
    Serial.println(requestBody);
    postRequest(requestBody, "moisture/");
    doc.clear();
    
    Serial.println("closing connection"); 
  }

  else {
    Serial.println("WiFi Disconnected");
  } 

  startDeepSleep(timer);

}


//reading water level
int readSensor() {
  digitalWrite(waterlevel_pin, HIGH);  // Turn the sensor ON
  delay(10);              // wait 10 milliseconds
  val = analogRead(waterlevelread_pin);    // Read the analog value form sensor
  digitalWrite(waterlevel_pin, LOW);   // Turn the sensor OFF
  return val;             // send current reading
}

//initial post request
int initiate(String hostname){

    DynamicJsonDocument doc(2048);
    // Add values in the document
    doc["hostname"] = String(hostname);

    String requestBody;
    serializeJson(doc, requestBody);

    postRequest(requestBody, "client/");
    return 1;
}

//post request handler
int postRequest(String requestBody, String api) {
    String urlName;
    urlName = serverName + api;
    WiFiClient client;
    HTTPClient http;
    http.begin(client, urlName);
    http.addHeader("Content-Type", "application/json");
    int httpResponseCode = http.POST(requestBody);
    if (httpResponseCode>0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);
        String payload = http.getString();
        Serial.println(payload);
    }
    else {
        Serial.print("Error code: ");
        Serial.println(httpResponseCode);
        return 0;
    }
    http.end();

    return 1;
}

//deepsleep function for battery saving
void startDeepSleep(int timer){
  Serial.println("Going to deep sleep...");
  ESP.deepSleep(timer * 1000000);
  yield();
  setup();
}