#include <DHTesp.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <HTTPClient.h>
#include <UrlEncode.h>
#include <WiFi.h>
#include <IRremote.h>

#define DHT_PIN 12
#define LDR_PIN 34
#define LED_SLC 22
#define LED_SDA 21
#define LED 4
#define BUZZER 0
#define RECEIVER 35

Adafruit_SSD1306 display(128, 64, &Wire, LED_SDA, LED_SLC);
IRrecv receiver(RECEIVER);
DHTesp dhtSensor;

/* WiFi */

const char* ssid = "Wokwi-GUEST"; // log in WiFi
const char* password = "";

float temperature = NAN;
float humidity = NAN;
float lightLevel = NAN;
float minTemp = NAN;
float maxTemp = NAN;
float minHum = NAN;
float maxHum = NAN;
float minLight = 400;
float interval;
unsigned int startTime, currentTime;
bool normal;
String abTemp; // abnormal temperature warning
String abHum; // abnormal humidity warning
String abLight; // abnormal light level warning

/* WhatsApp */

String phoneNumber; // receives environmental conditions report
String apiKey; // password used to send the report

/* IR remote */

float value = 0;
int mode = 1;
String val;
bool finished = false;

void setup() {
  Serial.begin(9600);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  Wire.begin(21, 22);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextColor(WHITE);
  pinMode(LDR_PIN, INPUT);
  pinMode(LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(RECEIVER, INPUT);

/* buzzer */

  ledcSetup(1, 1000, 8); // set up buzzer
  ledcAttachPin(0, 1); // attach buzzer pin

/* WiFi */

  WiFi.begin(ssid, password); // connect WiFi
  Serial.println("WiFi Connecting...");
  while (WiFi.status() != WL_CONNECTED) {} // wait until connected
  Serial.println("WiFi Connected.");
}

void loop() {
  abTemp = "";
  abHum = "";
  abLight = "";
  normal = true;

  TempAndHumidity  data = dhtSensor.getTempAndHumidity();

  temperature = data.temperature;
  humidity = data.humidity;

  const float GAMMA = 0.7;
  const float RL10 = 50;
  float analogValue = analogRead(LDR_PIN) / 4;
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  lightLevel = lux;

  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0, 0);
  display.print("T: ");
  display.print(tStr(temperature));
  if (temperature < minTemp || temperature > maxTemp) {
    display.print("!");
    abTemp = "!";
    normal = false;
  }
  display.println();
  display.print("H: ");
  display.print(hStr(humidity));
  if (humidity < minHum || humidity > maxHum) {
    display.print("!");
    abHum = "!";
    normal = false;
  }
  display.println();
  display.print("L: ");
  display.print(lStr(lightLevel));
  if (lightLevel < minLight) {
    display.print("!");
    abLight = "!";
    normal = false;
  }
  display.println();
  display.display();

  Serial.println();
  Serial.print("Temperature: ");
  Serial.print(tStr(temperature));
  if (temperature < minTemp) {
    Serial.print(" Too cold.");
  }
  if (temperature > maxTemp) {
    Serial.print(" Too hot.");
  }
  Serial.println();
  Serial.print("Humidity: ");
  Serial.print(hStr(humidity));
  if (humidity < minHum) {
    Serial.print(" Too dry.");
  }
  if (humidity > maxHum) {
    Serial.print(" Too humid.");
  }
  Serial.println();
  Serial.print("Light Level: ");
  Serial.print(lStr(lightLevel));
  if (lightLevel < minLight) {
    Serial.print(" Too dark.");
  }
  Serial.println();

/* LED and buzzer */

  if (normal == false) {
    for (int i = 1; i <= 3; i++) {
      digitalWrite(LED, HIGH);
      ledcWrite(1, 1); // sound the buzzer
      delay(200);
      digitalWrite(LED, LOW);
      ledcWrite(1, 0); // stop the buzzer
      delay(200);
    }
  }

  receiver.enableIRIn();
  finished = false;
  unsigned int IR_begin = millis();
  while ((millis()-IR_begin) < 5000 && !Serial.available() && finished == false) {
    if (receiver.decode()) {
      IR_begin = millis();
      translateIR();
      receiver.resume();
      switch (mode) {
      case 0:
      displ("Send to = ", val);
      break;

      case 1:
      displ("Api = ", val);
      break;

      case 2:
      displ("min Temp = ", val);
      break;

      case 3:
      displ("max Temp = ", val);
      break;

      case 4:
      displ("min Hum = ", val);
      break;

      case 5:
      displ("max Hum = ", val);
      break;

      case 6:
      displ("min Light = ", val);
      break;

      case 7:
      displ("Send to = ", val);
      break;
      }
    }
  }
  val = "";
  receiver.disableIRIn();

  if (Serial.available()) {
    String input = Serial.readStringUntil('\n');
    input.trim();

    if (input == "nth") {
      Serial.println();
      Serial.print("Temperature range: ");
      Serial.print(minTemp);
      Serial.print(" to ");
      Serial.print(maxTemp);
      Serial.println("C");
      Serial.print("Humidity range: ");
      Serial.print(minHum);
      Serial.print(" to ");
      Serial.print(maxHum);
      Serial.println("%");
      delay(3000);

/* WhatsApp */

    } else if (input == "send") {
        Serial.println();
        Serial.println("Please enter your phone number:");
        while(!Serial.available());
        if (Serial.available()) {
          phoneNumber = Serial.readStringUntil('\n');
          input.trim();
        }
        Serial.println(phoneNumber);
        Serial.println();
        Serial.println("Please enter your api key:");
        while(!Serial.available());
        if (Serial.available()) {
          apiKey = Serial.readStringUntil('\n');
          input.trim();
        }
        Serial.println(apiKey);
        Serial.println();
        Serial.println("How often do you want your report? (minutes)");
        while(!Serial.available());
        if (Serial.available()) {
          String input = Serial.readStringUntil('\n');
          input.trim();
          interval = input.toFloat();
        }
        Serial.println(interval, 0);
        Serial.println();
        Serial.println("This is your report: ");
        String report = String("T: ") + tStr(temperature) + abTemp + " H: " + hStr(humidity) + abHum +" L: " + lStr(lightLevel) + abLight;
        Serial.println(report);
        Serial.println();
        Serial.println("Press Enter to send the report.");
        while(!Serial.available());
        if (Serial.available()) {
          startTime = millis();
          sendReport(report);
        }
    }

    while (Serial.available()) {
      Serial.read();
    }
  }

  currentTime = millis();

  if (interval != 0 && (currentTime - startTime) >= (interval * 60000)) {
    startTime = millis();
    String report = String("T: ") + tStr(temperature) + abTemp + " H: " + hStr(humidity) + abHum +" L: " + lStr(lightLevel) + abLight;
    sendReport(report);
  }
}

String tStr(float temperature) {
  return String(temperature, 1) + "C";
}

String hStr(float humidity) {
  return String(humidity, 1) + "%";
}

String lStr(float lightLevel) {
  return String(lightLevel, 1) + "L";
}

float parseFloatValue(String input) {
  int colonIndex = input.indexOf(':');
  if (colonIndex != -1) {
    String valueStr = input.substring(colonIndex + 1);
    valueStr.trim();
    return valueStr.toFloat();
  }
  return NAN;
}

/* WhatsApp */

void sendReport(String report) {
  Serial.println("Sending...");
  String url = "https://api.callmebot.com/whatsapp.php?phone=852" + phoneNumber + "&text=" + urlEncode(report) + "&apikey=" + apiKey;
  // this url tells callmebot to send the report to the phone number
  HTTPClient http;
  http.begin(url); // send the url to the server

  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  int httpResponseCode = http.POST(url); // receive the server's response
  if (httpResponseCode == 200) {
    startTime = millis();
    Serial.println("Report sent.");
  }
  else {
    Serial.println("Unable to send the report.");
  }

  http.end();
}

void translateIR()
{
  switch (receiver.decodedIRData.command) {
    case 34:
      displ("TEST", "");
      break;
    case 2:
      value = val.toFloat();
      value++;
      val = String(value);
      break;
    case 194:
      val = "";
      finished = true;
      break;
    case 224:
      mode--;
      if (mode == -1) {
        mode = 7;
      }
      break;
    case 168:
      value = val.toFloat();
      switch (mode) {
        case 0:
        phoneNumber = value;
        Serial.println(phoneNumber);
        break;
        case 1:
        apiKey = value;
        // sendReport(report);
        Serial.println(apiKey);
        break;
        case 2:
        minTemp = value;
        break;
        case 3:
        maxTemp = value;
        break;
        case 4:
        minHum = value;
        break;
        case 5:
        maxHum = value;
        break;
        case 6:
        minLight = value;
        break;
      }
      val = "";
      finished = true;
      break;
    case 144:
      mode++;
      if (mode == 7) {
        mode = 0;
      }
      break;
    case 104:
      val = val + "0";
      break;
    case 152:
      value = val.toFloat();
      value--;
      val = String(value);
      break;
    case 176:
      val = "";
      break;
    case 48:
      val = val + "1";
      break;
    case 24:
      val = val + "2";
      break;
    case 122:
      val = val + "3";
      break;
    case 16:
      val = val + "4";
      break;
    case 56:
      val = val + "5";
      break;
    case 90:
      val = val + "6";
      break;
    case 66:
      val = val + "7";
      break;
    case 74:
      val = val + "8";
      break;
    case 82:
      val = val + "9";
      break;
  }
}

void displ(String str1, String str2) {
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0, 0);
  display.print(str1);
  display.print(str2);
  display.display();
}