#include <Arduino.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://upcpre202401si572sandbox-default-rtdb.firebaseio.com/.json"

HTTPClient client;

//Pin Setup
#define trigPin 5
#define echoPin 18
#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...");

	// Make Firebase Request
	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();
	}

	// Components

	// Distance Sensor setup

	pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
	
	// LED Actuators setup

	pinMode(ledV, OUTPUT);
	pinMode(ledR, OUTPUT);

	Serial.println("Green = Safe");
	Serial.println("Red = Unsafe");

	// User-oriented Activity Start
	
	for (int i=0; i<5; i++) {
  	digitalWrite(ledV, HIGH);
		digitalWrite(ledR, HIGH);
		delay(200);
		digitalWrite(ledV, LOW);
		digitalWrite(ledR, LOW);
		delay(200);
	}

	// Time Provider setup

	configTime(-9000, -9000, "1.south-america.pool.ntp.org");

}

void loop()
{
	// Setup initial state

	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;

	// Check Distance Safe status

	if(prev!=mesafe) {
		if(mesafe>200 || mesafe<0){
			digitalWrite(ledV, HIGH);
			digitalWrite(ledR, LOW);
			tempText = "Safe distance: ";
			ledVBool = "true";
			ledRBool = "false";
			safeDistBool = "true";
		}
		else {
			digitalWrite(ledV, LOW);
			digitalWrite(ledR, HIGH);
			tempText = "Unsafe distance: ";
			ledVBool = "false";
			ledRBool = "true";
			safeDistBool = "false";
		}

		// Build Data Record

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

		// Make Update Status Request

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

		client.POST("{\"Status/Sensors/time\":\"" + String(timeStringBuff) + "\"}");
		client.POST("{\"Status/Led/ledV\":" + ledVBool + "}");
		client.POST("{\"Status/Led/ledR\":" + ledRBool + "}");
		client.POST("{\"Status/Sensors/Distance\":" + String(mesafe) + "}");
		client.POST("{\"Status/Sensors/safeDist\":" + safeDistBool + "}");
		client.POST("{\"Status/Sensors/id\":\"" + sensorID + "\"}");
		
		// Show Status

		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");
	}

	// Update last Read
	
  prev = mesafe;
  delay(500);
}