#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include <Fonts/FreeSansBold12pt7b.h>

#define TFT_DC 9
#define TFT_CS 10

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

uint16_t TFT_WIDTH = 320;
uint16_t TFT_HEIGHT = 240;

#define BLACK 0x0000
#define WHITE 0xFFFF
#define FG 0xFFFF
#define BG 0x0000

void setup() {
 
    tft.begin();

    tft.setRotation(3);

    tft.fillScreen(BLACK);
    //tft.fillRect(0, 0, 320, 240, MIDGREY);

    randomSeed(analogRead(0));

}

void loop() {

  // Pick 2 random block functions
  int rand_1 = random(1, 17); // 1–16 inclusive
  int rand_2 = random(1, 17);

  for (int y = 0; y < TFT_HEIGHT; y += 40) {
    for (int x = 0; x < TFT_WIDTH; x += 40) {
      
      // Draw tile at this grid position
      drawTile(rand_1, rand_2, x, y);
    }
  }

  delay(2000); // pause before next full redraw

}

typedef void (*BlockFunc)(int, int);

BlockFunc blocks[] = {
  block_1, block_2, block_3, block_4,
  block_5, block_6, block_7, block_8,
  block_9, block_10, block_11, block_12,
  block_13, block_14, block_15, block_16
};

void drawTile(int rand_1, int rand_2, int x, int y) {
  blocks[rand_1 - 1](x, y);
  blocks[rand_2 - 1](x + 20, y);

  blocks[rand_2 - 1](x, y + 20);
  blocks[rand_1 - 1](x + 20, y + 20);
}


void pixel(int x, int y) {
  tft.fillRect(x, y, 10, 10, FG);
}

void blank(int x, int y) {
  tft.fillRect(x, y, 10, 10, BG);
}

void block_1(int x, int y) {
  blank(x,y);
  blank(x+10, y);
  blank(x+10, y+10);
  blank(x, y+10);
}

void block_2(int x, int y) {
  pixel(x,y);
  pixel(x+10, y);
  pixel(x+10, y+10);
  pixel(x, y+10);
}

void block_3(int x, int y) {
  pixel(x,y);
  blank(x+10, y);
  blank(x+10, y+10);
  blank(x, y+10);
}

void block_4(int x, int y) {
  blank(x,y);
  pixel(x+10, y);
  blank(x+10, y+10);
  blank(x, y+10);
}

void block_5(int x, int y) {
  blank(x,y);
  blank(x+10, y);
  pixel(x+10, y+10);
  blank(x, y+10);
}

void block_6(int x, int y) {
  blank(x,y);
  blank(x+10, y);
  blank(x+10, y+10);
  pixel(x, y+10);
}

void block_7(int x, int y) {
  pixel(x,y);
  blank(x+10, y);
  blank(x+10, y+10);
  pixel(x, y+10);
}

void block_8(int x, int y) {
  pixel(x,y);
  pixel(x+10, y);
  blank(x+10, y+10);
  blank(x, y+10);
}

void block_9(int x, int y) {
  blank(x,y);
  pixel(x+10, y);
  pixel(x+10, y+10);
  blank(x, y+10);
}

void block_10(int x, int y) {
  blank(x,y);
  blank(x+10, y);
  pixel(x+10, y+10);
  pixel(x, y+10);
}

void block_11(int x, int y) {
  pixel(x,y);
  blank(x+10, y);
  pixel(x+10, y+10);
  pixel(x, y+10);
}

void block_12(int x, int y) {
  pixel(x,y);
  pixel(x+10, y);
  blank(x+10, y+10);
  pixel(x, y+10);
}

void block_13(int x, int y) {
  pixel(x,y);
  pixel(x+10, y);
  pixel(x+10, y+10);
  blank(x, y+10);
}

void block_14(int x, int y) {
  blank(x,y);
  pixel(x+10, y);
  pixel(x+10, y+10);
  pixel(x, y+10);
}

void block_15(int x, int y) {
  pixel(x,y);
  blank(x+10, y);
  pixel(x+10, y+10);
  blank(x, y+10);
}

void block_16(int x, int y) {
  blank(x,y);
  pixel(x+10, y);
  blank(x+10, y+10);
  pixel(x, y+10);
}