#include <Arduino.h>
#include <ArduinoJson.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "time.h"

// WiFi Credentials
#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

// Firebase things
#define DATABASE_URL "https://exp1-264c7-default-rtdb.firebaseio.com/"
HTTPClient client;

//definir los pines
#define trigPin 25
#define echoPin 33
#define ledV 2
#define ledR 4
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

//variables
int prev = 0;
String tempText = "";
String payload = "";
String sensorID = "HC001";
char timeStringBuff[20];
String ledVBool;
String ledRBool;
String safeDistBool;

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

	LCD.init();
  LCD.backlight();
	LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("WiFi ");

	// WIFI
	WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
	Serial.print("connecting");
	while (WiFi.status() != WL_CONNECTED) {
		Serial.print(".");
		delay(500);
	}
	Serial.println();
	Serial.print("connected: ");
	Serial.println(WiFi.localIP());

	LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("Online");
	delay(500);
	LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("Connecting to");
  LCD.setCursor(0, 1);
  LCD.println("Firebase...");
	Serial.println("connecting...");

	// Firebase
	client.begin(DATABASE_URL);
	int httpResponseCode=client.GET();
	
	if (httpResponseCode>0) {
		LCD.clear();
		LCD.setCursor(0, 0);
		LCD.println("Connected");
		Serial.println("connected, Firebase payload:");
		payload = client.getString();
		Serial.println(payload);
		Serial.println();
	}

	// Componentes
	pinMode(trigPin, OUTPUT); //definir como salida
  pinMode(echoPin, INPUT); //definir como entrada
	pinMode(ledV, OUTPUT);
	pinMode(ledR, OUTPUT);

	Serial.println("Verde = DISTANCIA SEGURA");
	Serial.println("Rojo = NO SEGURA");

	// Indica comienzo de Transmisión de Datos
	for (int i=0; i<5; i++) {
  	digitalWrite(ledV, HIGH);
		digitalWrite(ledR, HIGH);
		delay(200);
		digitalWrite(ledV, LOW);
		digitalWrite(ledR, LOW);
		delay(200);
	}

	// Time
	configTime(-9000, -9000, "1.mx.pool.ntp.org");
}

void loop()
{
	long sure, mesafe;
	digitalWrite(trigPin, LOW);
	delayMicroseconds(2);
	digitalWrite(trigPin, HIGH);
	delayMicroseconds(2);
	digitalWrite(trigPin, LOW);
	sure=pulseIn(echoPin, HIGH);
	mesafe=(sure/2)/29.1;

	// Thêm phương thức PUT tại đây
	String path = String(DATABASE_URL) + "/Distance.json"; // Đường dẫn đến dữ liệu của bạn trên Firebase
	String data = String(mesafe); // Dữ liệu bạn muốn cập nhật
	client.begin(path);
	int httpCode = client.PUT(data);

	// Kiểm tra kết quả
	if(httpCode > 0) {
			if(httpCode == HTTP_CODE_OK) {
					Serial.println("PUT request successfully sent");
			} else {
					Serial.println("PUT request failed with error: " + String(httpCode));
			}
	} else {
			Serial.println("PUT request failed with error: " + String(client.errorToString(httpCode).c_str()));
	}


	// Firebase
	client.begin(path);
	int getHttpCode = client.GET();
	
	// Kiểm tra kết quả
	if(getHttpCode > 0) {
		// Nếu mã trạng thái HTTP là 200, yêu cầu GET thành công
		if(getHttpCode == HTTP_CODE_OK) {
			// Lấy dữ liệu trả về từ yêu cầu GET
			String payload = client.getString();
			
			// In dữ liệu ra Serial Monitor
			Serial.println("GET request successfully: " + payload);
			}
	} else {
			Serial.println("GET request failed with error: " + String(getHttpCode));
	}


	if(prev!=mesafe) {
		if(mesafe>200 || mesafe<0){
			digitalWrite(ledV, HIGH);
			digitalWrite(ledR, LOW);
			tempText = "DISTANCIA SEGURA: ";
			ledVBool = "true";
			ledRBool = "false";
			safeDistBool = "true";
		}
		else {
			digitalWrite(ledV, LOW);
			digitalWrite(ledR, HIGH);
			tempText = "NO SEGURA: ";
			ledVBool = "false";
			ledRBool = "true";
			safeDistBool = "false";
		}

		struct tm timeinfo;
		if (!getLocalTime(&timeinfo)) {
			Serial.println("Time Err");
		}
		strftime(timeStringBuff, sizeof(timeStringBuff), "%d/%m/%Y %H:%M", &timeinfo);
		Serial.println(String(timeStringBuff));

		client.PATCH("{\"Sensores/time\":\"" + String(timeStringBuff) + "\"}");
		client.PATCH("{\"Led/ledV\":" + ledVBool + "}");
		client.PATCH("{\"Led/ledR\":" + ledRBool + "}");
		client.PATCH("{\"Sensores/Distancia\":" + String(mesafe) + "}");
		client.PATCH("{\"Sensores/safeDist\":" + safeDistBool + "}");
		client.PATCH("{\"Sensores/id\":" + sensorID + "}");

		LCD.clear();
		LCD.setCursor(0,0);
		LCD.print(tempText);
		LCD.setCursor(0,1);
		LCD.print(mesafe);

		Serial.print(tempText);
		Serial.print(mesafe);
		Serial.println(" cm");
	}

  prev = mesafe;
  delay(500);
}