//LAB 1 - EXERCISE 1

//PROGRAM OBJECTIVE
//Change the program to blink on and off every 3 seconds


//GLOBAL VARIABLES

// Set up global variable for pin so that any configuration changes can easily and quickly be applied throughout the code 
int led = D2;

//Set up status variable to check the state of hte power - is it on or off? 
bool status = LOW; 


//PROGRAM

//Setup function configures the initial state of the microcontroller
//In this case, the microcontroller will be set to off when the program first runs. 
void setup() {
    pinMode(led, OUTPUT);
    
    //This code sets the starting LED status to off
    digitalWrite(led, LOW);
    
    //This code makes the functiona accessible via the cloud
    Particle.function("ledControl", ledControl); 
}

//Loop function repeats the actions in it repeatedly until the microcontroller is turned off (removed from power)
void loop() {

}

int ledControl (String command) {
    if(command.equals("on")) {
        status = HIGH;
        
        ////Version 1 - the easy approach 
        ////Blink on and off every 3 seconds
        //digitalWrite(led, HIGH);
        //delay(500); 
        //digitalWrite(led, LOW); 
        //delay(500); 
        
        //digitalWrite(led, HIGH); 
        //delay(500); 
        //digitalWrite(led, LOW); 
        //delay(500); 
       
        //digitalWrite(led, HIGH); 
        //delay(500); 
        //digitalWrite(led, LOW); 
        //delay(500); 
        
        //return 1; 
        
        //This indicates that the 'on' command was successfully received and exectued
        
        ////Version 2 - the harder approach
        ////Blink on and off every 3 seconds using loop
        
        //Using variable i, if i is less than 3, increment by 1
        for (int i = 1; i <=3; i++) {
        
        digitalWrite(led, HIGH); 
        delay(500);
        digitalWrite(led, LOW); 
        delay(500); 
        }
        
        //Return led to off state
        digitalWrite(led, LOW); 
    
        //This indicates that the 'on' command was successfully received and exectued
        return 1; 
    }
    
    if(command.equals("off")) {
        status = LOW; 
        return -1; // This indicates that the 'off' command was successfully received and exectued
    }
        
    return 401; //This indicates that there is an error
}

//If the command "on" is received, the LED is turned on and blinks 3x
//If the command "off" is received, the LED is turned off