/* BLYNK CONNECTION INSTRUCTION
  V0:BPM
  V1:TEMERATURE
  V2:SPO2
  V3:NOTIFICATION
  V4:NOTIFICATION CODE
  EMAIL:[email protected]
  PASSWORD:ZUproject@2024
*/

#define bled       23
#define gled      18
#define button     4

#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <ArduinoJson.h>

LiquidCrystal_I2C lcd(0x27,20,4);

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* serverUrl = "https://ny3.blynk.cloud/external/api/getAll?token=_sgpl64TZw0kTI1L9ei69OaCRwApMfnR";
 
String payload;
String v0,v1,v2,v3,v4;
float Temperature;
float bpm;
float spo2;
String notification;
String code;
bool rState;

void setup()
{
  lcd.init();                  
  lcd.backlight();
  loadingdisplay();
  
  Serial.begin(115200);
 
  pinMode(gled,OUTPUT);
  pinMode(bled,OUTPUT);
  pinMode(button, INPUT_PULLUP);
  digitalWrite(gled,LOW);
  digitalWrite(bled,LOW);
  connectWify();
  digitalWrite(bled,HIGH);
  digitalWrite(gled,LOW);
  lcd.clear();
}


void loop()
{
  homedisplay();
  //digitalWrite(led2,LOW);
  if (WiFi.status() == WL_CONNECTED) 
  {
    bool result = httpRead();
    if(result)
    {
      bool result2 = extractAndStore(payload);
      if(result2)
      {
        if(v4!="NORMAL")
        {
            while(digitalRead(button)==HIGH)
            {
              eventDisplay(v4);
              digitalWrite(gled,HIGH);
              delay(500);
             /* if(digitalRead(button)==LOW)
              {
                rState=LOW;
                lcd.clear();
                digitalWrite(gled,LOW);
                v4=" ";
              } 
              */
            }
              lcd.clear();
              digitalWrite(gled,LOW);
              v4=" ";
        }
        
      }
    }
  }
  else
  {
    reconnectDisplay();
    connectWify();
    lcd.clear();
  }
}

/*
void updateData()
{
   if(Temperature != v0)
  {
    Temperature=v0;
  }
  if(bpm != v1)
  {
    bpm = v1;
  }
  if(spo2 != v2)
  {
    spo2=v2;
  }
  if(notification != v3)
  {
    spo2=v3;
  }
  if(code != v4)
  {
    code=v4;
    rState =HIGH;
  }
}
*/

bool httpRead()
{
  HTTPClient http;
  http.begin(serverUrl);
  int httpResponseCode = http.GET();
  if (httpResponseCode > 0) 
  {
    payload = http.getString();
    Serial.println("HTTP Response code: " + String(httpResponseCode));
    Serial.println("Response data: " + payload);
    http.end();
    return HIGH;
  } 
  else 
  {
    Serial.println("Error on HTTP request");
    http.end();
    return LOW;
  }
}

void connectWify()
{
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) 
  {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loadingdisplay()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("*PATIENT MONITORING *"); 
  lcd.setCursor(0,1);
  lcd.print("*  SYSTEM VIA IOT   *"); 
  lcd.setCursor(0,2);
  lcd.print(" SYSTEM INITIALIZE ");
  lcd.setCursor(0,3);
  lcd.print("PLEASE WAIT");
  for(int k=11;k<20;k++)
  {
    lcd.setCursor(k,3);
    lcd.print(".");
    delay(500);
  }
}

void homedisplay()
{
  lcd.setCursor(0,0);
  lcd.print("********************"); 
  lcd.setCursor(0,1);
  lcd.print("*   NO EMERGENCY   *");
  lcd.setCursor(0,2);
  lcd.print("*     REPORTED     *");
  lcd.setCursor(0,3);
  lcd.print("********************");  
  delay(500);
}

void reconnectDisplay()
{
  lcd.setCursor(0,0);
  lcd.print("*******!ERROR!******"); 
  lcd.setCursor(0,1);
  lcd.print("* NO WiFY NETWORK  *");
  lcd.setCursor(0,2);
  lcd.print("*  RECONECTING...  *");
  lcd.setCursor(0,3);
  lcd.print("********************");  
  delay(500);
}

void eventDisplay(String code)
{
  String pstate;
  String parameter;
  String pnum;
  String wnum;
   
  pnum=code.substring(0,2);

  if(code.substring(4,6)=="LO")
  {
    pstate="LOW";
  }
  if(code.substring(4,6)=="HI")
  {
    pstate="HIGH";
  }

  if(code.substring(2,4)=="TE")
  {
    parameter="TEMPERATURE";
  }
  if(code.substring(2,4)=="SP")
  {
    parameter="OXYGEN LEVEL";
  }
  if(code.substring(2,4)=="HR")
  {
    parameter="HEART RATE";
  }
  
  String line2= pstate+" "+parameter;
  Serial.println(line2);
  String line3= "FROM PATIENT "+pnum;
  Serial.println(line3);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(" EMERGENCE ALERT "); 
  lcd.setCursor(0,1);
  lcd.print(line2); 
  lcd.setCursor(0,2);
  lcd.print(line3); 
  lcd.setCursor(0,3);
  lcd.print("PLEASE TAKE ACTION"); 
}

/*
void Alert(uint8_t num)
{
  for(num;num>0;num--)
  {
    digitalWrite(buzzer,HIGH);
    delay(750);
    digitalWrite(buzzer,LOW);
    delay(500);
  }
}
*/

bool extractAndStore(String jsonString) 
{
  StaticJsonDocument<200> doc;  // Allocate a buffer for parsing the JSON data
  DeserializationError error = deserializeJson(doc, jsonString);  // Deserialize the JSON data
  if (error)  // Check for errors
  {
    Serial.print("Failed to parse JSON: ");
    Serial.println(error.c_str());
    return LOW;
  }
  String data0 = doc["v0"];   
  v0=data0;
  String data1 = doc["v1"];
  v1=data1;
  String data2 = doc["v2"];
  v2=data2;
  String data3 = doc["v3"];
  v3=data3;
  String data4 = doc["v4"];
  v4=data4;
  Serial.println("Extracted Values:");  // Print extracted values for verification
  Serial.print("v0: ");
  Serial.println(v0);
  Serial.print("v1: ");
  Serial.println(v1);
  Serial.print("v2: ");
  Serial.println(v2);
  Serial.print("v3: ");
  Serial.println(v3);
  Serial.print("v4: ");
  Serial.println(v4);
  return HIGH;
}