// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>

// This #include statement was automatically added by the Particle IDE.
#include <SharpIR.h>
#include <math.h>
#define PIXEL_PIN D2
#define PIXEL_COUNT 20
#define PIXEL_TYPE WS2812B 

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);

//int led = D2
int IR = A0;
int button = D3;

float value = 0.0;
bool seeingPerson = false;

long lastCount = millis();

int passCount = 0;

void setup() {
    //pinMode(led, OUTPUT);
    pinMode(IR, INPUT);
    pinMode(button, INPUT_PULLDOWN);
    Serial.begin(9600);
    strip.begin();
    strip.show();
}

void loop() {
    float volts = float(analogRead(IR))*0.0048828125;  
    int distance = 13 * pow(volts, -1); 
    value = (value * 0.7) + (distance * 0.3);
    if (digitalRead(D3)) {
        passCount = 0;
        for(int i = 0; i < strip.numPixels(); i++){
            strip.setPixelColor(i, 0, 0, 0);
            strip.show();
            delay(100);
        }
    }
    if (value <= 2){
        if(!seeingPerson && (millis() - lastCount > 2000)){
            lastCount = millis();
            if (passCount < 40) {
                passCount++;
                if((passCount == 6) || (passCount == 16) || (passCount == 26) || (passCount == 36)){
                    passCount += 2;
                }
            }
            Serial.println(passCount);
            for(int i = 0; ((i < (passCount / 2)) && (i < PIXEL_COUNT)); i++){
                int fade = min(passCount * 6, 255);
                strip.setPixelColor(i, fade, 255- fade, 0);
            }
            strip.show();
            seeingPerson = true;
        }
        
        //Serial.println(int(value));  
    }
    else{
        seeingPerson = false;
    }
}