int motorPin = A3;
int buttonPin = D3; 

//https://maker.ifttt.com/trigger/button_pressed/json/with/key/bcFhSXZcj5VFoJT1n0CjFo


int medSpeed = 100; 
int lowSpeed = 50;
int hiSpeed = 180; 
int motorSpeed = 100;  
String statename[4] = {"WORK","QUICK BREAK","LONG BREAK","INACTIVE"};
String currentState = "NOT STARTED";

typedef struct {
    uint32_t totalTime = 0; 
    uint8_t state = 3; 
    unsigned long timer = 0; 
    unsigned long totaltimer = 0;
    bool active = false; 
}Pomodoro;

uint32_t pomTime[3] = {25,5,15};
Pomodoro myPom; 
Pomodoro *pPom;

long motorTimer = 0; 
int motorDelayMillis = 5000;
int timeLeft = 0; 

bool motorOn = false; 
bool button_press = false; 
long buttonTimer = 0; 
long buttonLength; 
int buttonState; 

void initPom(){
    pomTime[0] = min2milli(pomTime[0]);
    pomTime[1] = min2milli(pomTime[1]);
    pomTime[2] = min2milli(pomTime[2]);
    
    pPom = &myPom;
}


int startPomSession(String command){
    int mintime = command.toInt(); 
    myPom.totalTime = min2milli(mintime);
    myPom.state = 0; 
    myPom.active = true; 
    myPom.timer = millis();
    myPom.totaltimer = millis(); 
    motorControl(myPom.state);
    return myPom.totalTime; 
}

void pomCheck(){
    currentState = statename[myPom.state];
    timeLeft = milli2min(myPom.totalTime-millis()-myPom.totaltimer);
    if (myPom.active == false || myPom.state == 3){
        motorOn = false; 
        analogWrite(motorPin, 0);
        return;
    }
    if (millis()-myPom.totaltimer>=myPom.totalTime){
        myPom.active = false; 
        myPom.state = 3;
        motorOn = false; 
        motorControl(4);
        return;
    }
    else if (millis()-myPom.timer>=pomTime[myPom.state]){
        //go to next state and restart timer
        myPom.state ++; 
        if (myPom.state > 3) myPom.state = 0; 
        myPom.timer = millis();
        //trigger appropriate flag wave
        motorControl(myPom.state);
    }
}

void setup() {
    initPom();
    pinMode(motorPin, OUTPUT);
    pinMode(buttonPin, INPUT_PULLUP);
    Particle.function("StartPomSession", startPomSession);
    Particle.variable("PomodoroState", &currentState, STRING); 
    Particle.variable("PomLeft", &timeLeft, INT); 


}

void loop() {
    pomCheck(); 
    motorTimerCheck(); 
    buttonCheck();

}


void motorControl(int command)
{
    // Set Activation Time and Speed
    if (command == 0){
        TimerAdj(8);
        motorSpeed = hiSpeed;
    }
    else if (command == 1){
        TimerAdj(3);
        motorSpeed = hiSpeed;
    }
    else if (command == 2){
        TimerAdj(12);
        motorSpeed = medSpeed;
    }
    else if (command == 3){
        TimerAdj(2);
        motorSpeed = 0;
    }
    else if (command == 4){
        //finish
        TimerAdj(2);
        motorSpeed = lowSpeed;
        analogWrite(motorPin, motorSpeed);
        delay(4000);
        return;
    }
    
    analogWrite(motorPin, motorSpeed);
    motorOn = true;
    motorTimer = millis();
    // done
}

void motorTimerCheck(){
    // if timer has elapsed
    if (motorOn && millis()-motorTimer>= motorDelayMillis){
        motorSpeed = 0; 
        motorOn = false;
        analogWrite(motorPin, motorSpeed);
    }
    if (motorOn == false) analogWrite(motorPin, 0);
}

void TimerAdj(int seconds){
    // convert to seconds
    motorDelayMillis = 1000* seconds;
}
int min2milli(int minutes){
    return 1000*60*60*minutes; 
}

int milli2min(int milli){
    return milli/1000/60/60; 
}

void buttonCheck(){
    if (digitalRead(buttonPin)==LOW){
        analogWrite(motorPin,0);
        myPom.state = 3; 
        motorControl(3);
        myPom.active = false; 
        
    }
}