#include <altsoftserial.h>
#include <TinyGPS++.h>
#include <Wire.h>
#include <math.h>
#include <SoftwareSerial.h>

const string EMERGENCY_PHONE ="+919342889536";
#define rxPin 2
#define txPin 3

SoftwareSerial sim800(rxPin, txPin);
AltSoftSerial neogps;
TinyGPSPlus gps;
//gps(9,8)

String sms_status, sender_number, received_data, msg;
String latitude, longitude;
#define BUZZER 12
#define BUTTON 11
#define xPin A1
#define yPin A2
#define zPin A3
byte updateflag;

int xaxis=0, yaxis=0, zaxis=0;
int deltx=0, delty=0, deltz=0;
int vibration=2;
int devibrate=75;
int magnitude=0;
int sensitivity=20;

double angle;
boolean impact-detected=false;
unsigned long time1;
unsigned long impact_time;
unsigned long alert_delay=30000;

void setup()
{

  Serial.begin(9600);
  sim800.begin(9600);
  neogps.begin(9600);
  pinMode(BUZZER, OUTPUT);
  pinMode(BUZZER, INPUT_PULLUP);

  sms_status="";
  sender_number="";
  received_data="";
  msg="";
  sim800.println("AT");
  delay(1000);
  sim800.println("ATE1");
  delay(1000);
  sim800.println("AT+CPIN?");
  delay(1000);
  sim800.println("AT+CMGF=1");
  delay(1000);
  sim800.println("AT+CNMI=1,1,0,0,");
  delay(1000);
time1=micros();
xaxis=analogRead(xPin);
yaxis=analogRead(yPin);
zaxis=analogRead(zpin);

vibration--;
Serial.print("Vibration=");
Serial.println(vibration);
if(vibration<0) vibration=0;
if(vibration>0) return;
deltx= xaxis -oldx;
delty= yaxis -oldy;
deltz= zaxis -oldz;

magnitude=sqrt(sq(deltx)+ sq(delty)+ sq(deltz));
if (magnitude>=sensitivity)
{
  updateflag=1;
  vibration=devibrate;
}
else{
  magnitude=0;

}
}
void parseData(String.buff){
  Serial.println(buff){

    unsigned int len,index;
    index=buff.index0f("\r");
    buff.remove(0,index+2);
    buff.trim();
    if(buff!="OK"){
      index=buff.index0f(":");
      String cmd=buff.substring(0,index);
      cmd.trim();

      buff.remove(0,index+2);
      if(cmd=="+CMTI"){
      index=buff.index0f(",");
      String temp=buff.substring(index+1,buff.length());
      temp="AT+CMGR="+ temp+"\r";
      sim800.println(temp);
    }
    else if (cmd=="+CMGR"){
      if (buff.index0f(EMERGENCY_PHONE)>1){
        buff.toLowerCase();
        if(buff.index0f("get gps")>1){
          getGps();
          String sms_data;
          sms_data="GPS Location Data\r";
          sms_data+="http://maps.googlr.com/maps?q=loc:";
          sms_data+= latitude+","+longitude;

          sendSms(sms_data);
        }
      }
    }
  }
  else{
  }
}
void getGps()
[
  boolean newData = false;
  for (unsigned long start = millis(); millis() start <2000;){
    while (neogps.available()){
      newData = true;
      break ;
    }
    }
  }
  if(newData)
  
{  
latitude = string(gps.location.lat(),6);
longitiude = string(gps.location.lng(),6);
newData =false;
}
else {
  Serial.println("No GPS data is available");
  latitude ="";
  longitude ="";

}
Serial.print("latitude ="); Serial.println(latitude);
Serial.print("longitude ="); Serial.println(longitude);
}

void sendAlert()
{ 
  string sms_data;
  sms_data ="Accident Alert!\r";
  sms_data += "http://maps.google.com/maps?q=loc:");
  sms_data += latitude+","+longitude:
  sendSms(sms_data);
}
void makecall()
{
  Serial.println("calling....");
  sim800.println("ATD" + EMERGENCY_PHONE + ",");
  delay(2000);
  sim800.println("ATH");
  delay(1000);

  }
  void sendSms(String text)
  {
    sim800.Print("AT+CMGF+1|r");
    delay(1000);
    sim800.println("AT+CMGS=\"" + EMERGENCY_PHONE + "\"\r");
    delay(1000);
    sim800.print(text);
    delay(100);
    sim800.write(0x1a);
    delay(1000);
    Serial.println("SMS Sent Successfully.");

  }
  boolean SendAT(String at_command,string expected_answer,unsigned int timeout) {
    uint8_t x=0;
    boolean answer = 0;
    String response;
    unsigned long previous;
    while(sim800.available() > 0) sim800.read();

    simi800.println(at_command);

    x=0;
    previous = millis ();

    do{
      if (sim800.available()!=0) {
        response += sim800.read();
        x++;
        if (response.index0f(expected_answer)>0){
          answer = 1;
          break;
        }    
      }
    }
    while ((answer == 0)&& ((millis() - previous)<timeout)) {
      uint8_t x=0;
      boolean answer = 0;
      String response;
      unsigned long previous;
      while(sim800.available() >0) sim800.read();

      sim800.println(at_command);

      x=0;
      previous = millis();
      do {
        if (sim800 available ()!=0) {
          response +=sim800.read();
          x++;
          if (response.index0f(expected_answer) > 0) {
            answer = 1;
            break;
          }
        }
      } 
      while ((answer ==0) && ((millis() - previous) < timout));
      Serial.println(response);
      return answer;
    }
  }
}
]