#include "WiFi.h"
#include "PubSubClient.h"
// importing other necessary libraries
#include <time.h>
#include <stdlib.h>
#include <WiFi.h>
#include <ESP32Servo.h>
#include <wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

char clientId[50];
int servoPin1 = 12;
Servo servo1;
int servoPin2 = 4;
Servo servo3
int servoPin3 = 15;
Servo servo3;

// configure server data
WiFiClient espClient;
PubSubClient client(espClient);

// define led pins
int redPin = 4;
int whitePin = 5;
int greenPin = 14;
int yellowPin = 13;
 
void setup() 
{
  Serial.begin(9600);

  // attaching each servo motor with its respective servo pin
  servo1.attach(servoPin1, 500, 2400);
  servo1.attach(servoPin2, 500, 2400);
  servo1.attach(servoPin3, 500, 2400);

  // checking whether the oled display is connected or not
  // SSD1306_SWITCHCAPVCC is the display voltage internally which is connected to VCC (3.3V)
  // 0x3C is the address of 128x64 oled display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)){
    Serial.println(F("SSD1306 allocation failed"));
    // empty loop meaning the message above won't be printed more than once in console
    for(;;); 
  }

  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);

  Serial.print("Connecting to...");
  // searches wifi station where ESP32 connects to an access point
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST", ""); // initializes username and pw
  
  // connecting to server -- setting up hostname and port num
  client.setServer("broker.emqx.io", 1883);
  // calls calback() which gets us current time from server (our python code)
  client.setCallback(callback); 

  pinMode(redPin, OUTPUT);
  pinMode(whitePin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
}

void mqttReconnect() 
{
  while (!client.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(clientId)) 
    {
      Serial.println("Connected");
      client.subscribe("topicName/iot");
    } 
    else 
    {
      Serial.print("failed, reconnect = ");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) 
{
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print("Message: ");
  String stMessage;
  for (int i = 0; i < length; i++)
  {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }

  if(stMessage == "1"){
    Serial.println("1");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Release Orbital Arm");
    display.display();
    servo1.write(180);
  }
  else if(stMessage == "2"){
    Serial.println("2");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Main Engine Gimbal Test and Lift Beanie Cap");
    display.display();
    servo2.write(0);
  }
  else if(stMessage == "3"){
    Serial.println("3");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Activate Hydrogen Burn-off System");
    display.display();
    digitalWrite(yellowPin, HIGH);  
  }
  else if(stMessage == "4"){
    Serial.println("4");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Main Engine Ignite");
    display.display();
    digitalWrite(whitePin, HIGH);  
  }
  else if(stMessage == "5"){
    Serial.println("5");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Hydrogen Vent Arm | Release Tail Surface Mass | Detonate");
    display.display();
    servo3.write(360);
  }
  else if(stMessage == "6"){
    Serial.println("6");
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 0);

    // display static text
    display.println("Ignite Both SRBs");
    display.display();
    digitalWrite(redPin, HIGH);
  }
}
void loop() 
{
  // runs the following code for every 1 second
  // or else it will run for every frame (lagginess?)
  delay(1000);
  if(!client.connected()) 
  {
    mqttReconnect();
  }
  client.loop();
}