#include <Arduino.h>
#include <FastLED.h>
#include <TFT_eSPI.h>
#include <SPI.h>

// Declare all variables that are needed to get the lights working
#define NUM_LEDS_PANEL 33
#define NUM_PANELS 7
#define DATA_PIN 15

// variable parameters
uint8_t brightness = 200;
uint8_t hue = 0;
uint8_t hueStart = 0;
uint8_t value = 255;
uint8_t saturation = 255;

// Now add some parameters for the rainbow effect
// First the speed with which the colors change
const unsigned long rainbowInterval = 100;
// Second the previous time object so the rainbow function knows when it needs to add to the hue
unsigned long previousTimeRainbow;
// Initialise the array that holds the rgb information on each LED
CRGB leds[NUM_LEDS_PANEL * NUM_PANELS];
TFT_eSPI tft = TFT_eSPI();

// Define functions in forward declaration
void rainbow_move() {
  // Let's start of with a rainbow that moves with time
  // First we set the rainbow in it's starting state and define the starting state
  // For this we need to fill every panel with a color
  if(millis() - previousTimeRainbow >= rainbowInterval) {
    // set all panels to a different color equally spaced on the color spectrum
    for(int idPanel = 0; idPanel < NUM_PANELS; idPanel++){
      // first we need to set the hue back to the first hue so the panels change color smoothly
      // but only if this is the first panel (this panel 'remembers' it's previous hue)
      if(idPanel == 0){
      // Set hue back to hue start
        hue = hueStart;
      }
      // set all LEDs in a panel to the same color
      for(int idLed = 0; idLed < NUM_LEDS_PANEL; idLed++){
        leds[idPanel * NUM_LEDS_PANEL + idLed] = CHSV(hue, saturation, value);
      }
      // Now change the hue so the next panel is next on the color spectrum
      hue = hue + 256/NUM_PANELS;
    }
    // Now that all colors are set add 1 to the hue of the first panel so next time it will be shifted in color slightly
    hueStart++;
    previousTimeRainbow = millis();
    //Serial.println(hue);
    //Serial.println("Change hue!");
    tft.setCursor(0,24);
    tft.fillScreen(TFT_BLACK);
    tft.print("HUE ");
    tft.print(hue);
    tft.print("  Hue start ");
    tft.print(hueStart);
  }
}

void setup() {
  // put your setup code here, to run once:
  // initialise LEDs
  pinMode(DATA_PIN,OUTPUT);
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS_PANEL * NUM_PANELS);
  FastLED.setBrightness(brightness);
  // set the brightness
  //FastLED.setBrightness(brightness);
  // tft screen stuff
  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(TFT_BLACK);
  tft.setTextColor(TFT_GREEN, TFT_BLACK);
  tft.setFreeFont(&Orbitron_Light_24);
  tft.setTextPadding(tft.width());

}

void loop() {
  // put your main code here, to run repeatedly:
  // if(millis()- previousTimeRainbow > rainbowInterval){
  //   if(brightness < 100){
  //     brightness++;
  //   }
  //   else{
  //     brightness = 20;
  //   }
  // }
  // Now run the rainbow function to change hue
  rainbow_move();
  // Finally send the command to the LEDs
  FastLED.show();
}