// #include <SPI.h>
#include <Adafruit_GFX.h> // https://github.com/adafruit/Adafruit-GFX-Library
// https://learn.adafruit.com/adafruit-gfx-graphics-library/graphics-primitives
#include <Adafruit_ILI9341.h> // https://github.com/adafruit/Adafruit_ILI9341

#define TFT_RST   8
#define TFT_DC    9
#define TFT_CS   10
#define TFT_MOSI 11
#define TFT_MISO 12
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

#define SCREEN_WIDTH 240
#define SCREEN_HEIGHT 320
#define HALF_WIDTH SCREEN_WIDTH / 2
#define HALF_HEIGHT SCREEN_HEIGHT / 2
int rowHeight = 8, colWidth = 33;
int row = 3, col = 3, chr = 0;

#define RED 0xF800 // 565 0b 11111 000000 00000 // https://rgbcolorpicker.com/565
#define ORG 0xFC00 // 565 0b 11111 100000 00000
#define YEL 0xFFE0 // 565 0b 11111 111111 00000
#define GRN 0x07E0 // 565 0b 00000 111111 00000
#define CYN 0x07FF // 565 0b 00000 111111 11111
#define BLU 0x001F // 565 0b 00000 000000 11111
#define MAG 0xF81F // 565 0b 11111 000000 11111
#define WHT 0xFFFF // 565 0b 11111 111111 11111
#define GRY 0xC618 // 565 0b 11000 110000 11000
#define BLK 0x0000 // 565 0b 00000 000000 00000

void setup() {
  Serial.begin(115200);
  // Serial.println();
  tft.begin();
  tft.setRotation(0); // 0 = none, 1 = 90CW, 2 = 180, 3 = 270CW

  test();

  textCharacters();
  textDraw();
  textSize();
  graphics();
}

void loop() { }

void test() {
  graphics();

  int y = HALF_HEIGHT - HALF_WIDTH;
  int x = HALF_WIDTH;
  tft.drawPixel(x, y, WHT); // apex of large triangle
}

void textCharacters() {
  tft.setCursor(col, row);
  tft.setTextSize(1);
  tft.setTextColor(GRN);
  // tft.setTextColor(uint16_t color, uint16_t bgcolor);
  // tft.setTextWrap(w); // boolea

  for (int i = 0; i < 256; i++) {
    if (chr < 10) tft.print(" "); // space for tens
    if (chr < 100) tft.print(" "); // space for hundreds
    tft.print(chr);
    tft.print(" ");
    tft.write(chr);

    row += rowHeight;
    if (row > SCREEN_HEIGHT - rowHeight) {
      row = 3;
      col += colWidth;
    }
    chr++;
    tft.setCursor(col, row);
  }
}

void textSize() {
  tft.setCursor(0, SCREEN_HEIGHT / 3);

  for (int i = 1; i < 6; i++) {
    switch (i) {
      case 1: tft.setTextColor(ORG); break;
      case 2: tft.setTextColor(MAG); break;
      case 3: tft.setTextColor(CYN); break;
      case 4: tft.setTextColor(GRY); break;
      case 5: tft.setTextColor(WHT); break;
    }
    tft.setTextSize(i);
    tft.print("Size");
    tft.println(i);
  }
}

void textDraw() {
  tft.drawChar(205, 195, 'A', BLK, GRY, 5);
  tft.drawChar(205, 235, 'B', BLK, GRY, 5);
  tft.drawChar(205, 275, 'C', BLK, GRY, 5);
}

void graphics() {
  // tft.drawPoint(x, y, c);
  tft.drawLine(0, SCREEN_HEIGHT, SCREEN_WIDTH, 0, RED);
  tft.drawLine(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, ORG);

  // tft.drawEllipse(x, y, rx, ry, c);
  // tft.fillEllipse(x, y, rx, ry, c);

  tft.drawRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, YEL);
  // tft.fillRect(x0, y0, x1, y1, c);

  tft.drawCircle(HALF_WIDTH, HALF_HEIGHT - HALF_WIDTH, HALF_WIDTH, WHT);
  tft.drawCircle(HALF_WIDTH, HALF_HEIGHT, HALF_WIDTH, BLU);
  tft.drawCircle(HALF_WIDTH, HALF_HEIGHT + HALF_WIDTH, HALF_WIDTH, WHT);
  // tft.fillCircle(x, y, r, c);

  tft.drawRoundRect(20, 20, SCREEN_WIDTH - 40, SCREEN_HEIGHT - 40, 20, CYN); // 20 = corner radius
  // tft.fillRoundRect(x, y, w, h, r, c);

  tft.drawTriangle(HALF_WIDTH, HALF_HEIGHT - HALF_WIDTH, 17, 220,  223,  220,  YEL);
  tft.drawTriangle(HALF_WIDTH, HALF_HEIGHT + HALF_WIDTH / 2, 67, 133,  173,  133,  YEL);
  // tft.fillTriangle(x0, y0, x1,  y1,  x2,  y2,  color);
}