#include <TFT_eSPI.h> // Hardware-specific library
#include <SPI.h>
#include <Ticker.h>

TFT_eSPI tft;
Ticker every10sec;

unsigned long targetTime = 0;
byte red = 31;
byte green = 0;
byte blue = 0;
byte state = 0;
unsigned int colour = red << 11; // Colour order is RGB 5+6+5 bits each

void rainbow_fill()
{
  // The colours and state are not initialised so the start colour changes each time the function is called
  
  for (int i = 319; i > 0; i--) {
    // Draw a vertical line 1 pixel wide in the selected colour
    tft.drawFastHLine(0, i, tft.width(), colour); // in this example tft.width() returns the pixel width of the display
    // This is a "state machine" that ramps up/down the colour brightnesses in sequence
    switch (state) {
      case 0:
        green ++;
        if (green == 64) {
          green = 63;
          state = 1;
        }
        break;
      case 1:
        red--;
        if (red == 255) {
          red = 0;
          state = 2;
        }
        break;
      case 2:
        blue ++;
        if (blue == 32) {
          blue = 31;
          state = 3;
        }
        break;
      case 3:
        green --;
        if (green == 255) {
          green = 0;
          state = 4;
        }
        break;
      case 4:
        red ++;
        if (red == 32) {
          red = 31;
          state = 5;
        }
        break;
      case 5:
        blue --;
        if (blue == 255) {
          blue = 0;
          state = 0;
        }
        break;
    }
    colour = red << 11 | green << 5 | blue;
  }
}

void tftRefresh() {
    rainbow_fill(); // Fill the screen with rainbow colours

    // The standard AdaFruit font still works as before
    tft.setTextColor(TFT_BLACK); // Background is not defined so it is transparent
 
    tft.setCursor (60, 5);
    tft.setTextFont(0);        // Select font 0 which is the Adafruit font
    tft.print("Original Adafruit font!");

    //tft.drawString("Original Adafruit font!",60,5,1); 

    // The new larger fonts do not need to use the .setCursor call, coords are embedded
    tft.setTextColor(TFT_BLACK); // Do not plot the background colour
    // Overlay the black text on top of the rainbow plot (the advantage of not drawing the background colour!)
    tft.drawCentreString("Font size 2", 120, 8, 2); // Draw text centre at position 120, 14 using font 2
    tft.drawCentreString("Font size 4", 120, 24, 4); // Draw text centre at position 120, 30 using font 4
    tft.drawCentreString("12.34", 120, 48, 6);       // Draw text centre at position 120, 54 using font 6

    tft.drawCentreString("12.34 is in font size 6", 120, 86, 2); // Draw text centre at position 120, 92 using font 2
    // Note the x position is the top of the font!

    // draw a floating point number
    float pi = 3.14159; // Value to print
    int precision = 3;  // Number of digits after decimal point
    int xpos = 90;      // x position
    int ypos = 110;     // y position
    int font = 2;       // font number 2
    xpos += tft.drawFloat(pi, precision, xpos, ypos, font); // Draw rounded number and return new xpos delta for next print position
    tft.drawString(" is pi", xpos, ypos, font);             // Continue printing from new x position

    tft.setTextSize(1);           // We are using a size multiplier of 1

    tft.setTextColor(TFT_BLACK);  // Set text colour to black, no background (so transparent)

    tft.setCursor(36, 130, 4);    // Set cursor to x = 36, y = 150 and use font 4
    tft.println("Transparent...");  // As we use println, the cursor moves to the next line

    tft.setCursor(30, 154);    // Set cursor to x = 30, y = 175
    tft.setTextColor(TFT_WHITE, TFT_BLACK);  // Set text colour to white and background to black
    tft.println("White on black");

    tft.setTextFont(4);        // Select font 4 without moving cursor
    tft.setCursor(50, 184);    // Set cursor to x = 50, y = 210 without changing the font
    tft.setTextColor(TFT_WHITE);
    // By using #TFT print we can use all the formatting features like printing HEX
    tft.print(57005, HEX);    // Cursor does no move to next line
    tft.println(48879, HEX);  // print and move cursor to next line

    tft.setTextColor(TFT_GREEN, TFT_BLACK); // This time we will use green text on a black background
    tft.setTextFont(2); // Select font 2
    //Text will wrap to the next line if needed, by luck it breaks the lines at spaces!
    tft.println(" Ode to a Small Lump of Green Putty I Found in My Armpit One Midsummer Morning ");
}

void setup(void) {
  Serial0.end();
  Serial.begin(115200);
  SPI.begin(TFT_SCLK, -1, TFT_MOSI, TFT_CS);
  SPI.setFrequency(SPI_FREQUENCY);
  analogWrite(TFT_BL, 0);
  tft.init();
  tft.invertDisplay( false );
  tft.setRotation(TFT_ROT);
  tft.fillScreen(TFT_RED);
  delay(200);
  analogWrite(TFT_BL, TFT_BL_LEVEL);
  every10sec.attach(10, tftRefresh);
  Serial.println("Init complete");
  delay(1000);
  tftRefresh();
}

void loop() {
  delay(-1);
}