#include "FastLED.h"
#include <NewPing.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
 
#define TRIGGER_PIN 13
#define ECHO_PIN 12
#define MAX_DISTANCE 50

#define NUM_STRIPS 3
#define NUM_LEDS_PER_STRIP 16
#define NUM_LEDS NUM_LEDS_PER_STRIP * NUM_STRIPS

CRGB leds[NUM_STRIPS * NUM_LEDS_PER_STRIP];

// NewPing setup of pins and maximum distance
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); 

//int db[] = {0,1,2,3,4,5,6,7,8,13,12,11,10,9,17,16,15,14};     // Radiant-D LED sequence
int db[] = {5,6,4,7,3,8,2,9,1,10,0,11,15,12,14,13,
           21,22,20,23,19,24,18,25,17,26,16,27,31,28,30,29,
           33,34,32,35,47,36,46,37,45,38,44,39,43,40,42,41};

void setup()
{
  delay(1000);                                                // Power-up safety delay.
  FastLED.addLeds<NEOPIXEL, 3>(leds, 0, NUM_LEDS_PER_STRIP);
  FastLED.addLeds<NEOPIXEL, 5>(leds, NUM_LEDS_PER_STRIP, NUM_LEDS_PER_STRIP);
  FastLED.addLeds<NEOPIXEL, 6>(leds, NUM_LEDS_PER_STRIP*2, NUM_LEDS_PER_STRIP);

   lcd.begin(16, 2);

   // 閃爍三次
  for(int i = 0; i < 3; i++) {
    lcd.backlight(); // 開啟背光
    delay(250);
    lcd.noBacklight(); // 關閉背光
    delay(250);
  }
  lcd.backlight();

  // 輸出初始化文字
  lcd.setCursor(5, 0); // 設定游標位置在第一行行首
  lcd.print("Gelid");
  delay(1000);
  lcd.setCursor(3, 1); // 設定游標位置在第二行行首
  lcd.print("Solutions");
  delay(8000);
}

// *** REPLACE FROM HERE ***
void loop() {
  
   delay(50);
   unsigned int distance = sonar.ping_cm();
   lcd.clear();
   lcd.setCursor(0, 0);
   lcd.print("Gelid Solutions");

   lcd.setCursor(0, 1);
   lcd.print("distance: ");
   lcd.print(distance);
   lcd.print(" cm");
   delay(1000); 

  int metrosize = map(distance, 0, 50, 10, 32);
  
  // ---> here we call the effect function <---
  meteorRain(0xff,0xff,0xff,metrosize, 64, true, 30);
}

// ---> here we define the effect function <---
// *** REPLACE TO HERE ***

void meteorRain(byte red, byte green, byte blue, byte meteorSize, byte meteorTrailDecay, boolean meteorRandomDecay, int SpeedDelay) {  
  setAll(0,0,0);

  for(int i = 0; i < NUM_LEDS+NUM_LEDS; i++) {
    // fade brightness all LEDs one step
    for(int j=0; j<NUM_LEDS; j++) {
      if( (!meteorRandomDecay) || (random(10)>5) ) {
        fadeToBlack(j, meteorTrailDecay );        
      }
    }
    // draw meteor

    for(int j = 0; j < meteorSize; j++) {
      if( ( i-j <NUM_LEDS) && (i-j>=0) ) {
        setPixel(i-j, red, green, blue);
      } 
    }

    showStrip();
    delay(SpeedDelay);
  }
}

void fadeToBlack(int ledNo, byte fadeValue) {

   // FastLED
   leds[db[ledNo]].fadeToBlackBy( fadeValue );
   
}

//copy end here

void showStrip() {
   // FastLED
   FastLED.show();

}

void setPixel(int Pixel, byte red, byte green, byte blue) {

   // FastLED
   leds[db[Pixel]].r = red;
   leds[db[Pixel]].g = green;
   leds[db[Pixel]].b = blue;
 
}

void setAll(byte red, byte green, byte blue) {
  for(int i = 0; i < NUM_LEDS; i++ ) {
    setPixel(i, red, green, blue);
  }
  showStrip();
}