#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define TFT_DC 2
#define TFT_CS 15
#define TFT_RST 4

#define BUTTON_PIN 13

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

bool layarNyala = false;
bool lastButtonState = HIGH;

// ===== LOGO KACANG =====
void gambarKacang(int x, int y) {
  tft.fillCircle(x, y, 20, ILI9341_YELLOW);
    tft.fillCircle(x + 15, y, 20, ILI9341_YELLOW);
    }

    // ===== WELCOME =====
    void tampilWelcome() {
      tft.fillScreen(ILI9341_BLACK);

        // logo tengah
          gambarKacang(140, 90);

            // tulisan Welcome
              tft.setCursor(90, 150);
                tft.setTextColor(ILI9341_WHITE);
                  tft.setTextSize(2);
                    tft.print("Welcome");
                    }

                    // ===== DESKTOP =====
                    void tampilDesktop() {
                      tft.fillScreen(ILI9341_CYAN);

                        // judul OS
                          tft.setCursor(10, 10);
                            tft.setTextColor(ILI9341_BLACK);
                              tft.setTextSize(2);
                                tft.print("PE OS");

                                  // ===== ICON =====
                                    tft.fillRect(20, 40, 40, 40, ILI9341_WHITE);
                                      tft.drawRect(20, 40, 40, 40, ILI9341_BLACK);
                                        tft.setCursor(22, 85);
                                          tft.setTextSize(1);
                                            tft.print("Browser");

                                              tft.fillRect(80, 40, 40, 40, ILI9341_YELLOW);
                                                tft.drawRect(80, 40, 40, 40, ILI9341_BLACK);
                                                  tft.setCursor(90, 85);
                                                    tft.print("File");

                                                      tft.fillRect(140, 40, 40, 40, ILI9341_MAGENTA);
                                                        tft.drawRect(140, 40, 40, 40, ILI9341_BLACK);
                                                          tft.setCursor(142, 85);
                                                            tft.print("Music");

                                                              tft.fillRect(200, 40, 40, 40, ILI9341_GREEN);
                                                                tft.drawRect(200, 40, 40, 40, ILI9341_BLACK);
                                                                  tft.setCursor(205, 85);
                                                                    tft.print("Game");

                                                                      // window tengah
                                                                        tft.fillRect(60, 110, 200, 80, ILI9341_WHITE);
                                                                          tft.drawRect(60, 110, 200, 80, ILI9341_BLACK);

                                                                            tft.setCursor(70, 140);
                                                                              tft.setTextColor(ILI9341_BLACK);
                                                                                tft.setTextSize(2);
                                                                                  tft.print("Welcome PE OS!");

                                                                                    // taskbar
                                                                                      tft.fillRect(0, 200, 320, 40, ILI9341_DARKGREY);

                                                                                        tft.fillRect(0, 200, 60, 40, ILI9341_GREEN);
                                                                                          tft.setCursor(5, 210);
                                                                                            tft.setTextColor(ILI9341_BLACK);
                                                                                              tft.setTextSize(2);
                                                                                                tft.print("Start");

                                                                                                  tft.setCursor(250, 210);
                                                                                                    tft.setTextColor(ILI9341_WHITE);
                                                                                                      tft.setTextSize(2);
                                                                                                        tft.print("09:00");
                                                                                                        }

                                                                                                        void setup() {
                                                                                                          SPI.begin(18, 19, 23);
                                                                                                            tft.begin();

                                                                                                              pinMode(BUTTON_PIN, INPUT_PULLUP);

                                                                                                                tft.fillScreen(ILI9341_BLACK);
                                                                                                                }

                                                                                                                void loop() {
                                                                                                                  bool buttonState = digitalRead(BUTTON_PIN);

                                                                                                                    if (lastButtonState == HIGH && buttonState == LOW) {
                                                                                                                        layarNyala = !layarNyala;

                                                                                                                            if (layarNyala) {

                                                                                                                                  // ===== BOOT =====
                                                                                                                                        tft.fillScreen(ILI9341_BLUE);

                                                                                                                                              gambarKacang(140, 90);

                                                                                                                                                    tft.setCursor(60, 160);
                                                                                                                                                          tft.setTextColor(ILI9341_WHITE);
                                                                                                                                                                tft.setTextSize(2);
                                                                                                                                                                      tft.print("Booting PE OS...");

                                                                                                                                                                            delay(1500);

                                                                                                                                                                                  // ===== WELCOME =====
                                                                                                                                                                                        tampilWelcome();
                                                                                                                                                                                              delay(1500);

                                                                                                                                                                                                    // ===== DESKTOP =====
                                                                                                                                                                                                          tampilDesktop();

                                                                                                                                                                                                              } else {
                                                                                                                                                                                                                    tft.fillScreen(ILI9341_BLACK);
                                                                                                                                                                                                                        }

                                                                                                                                                                                                                            delay(200);
                                                                                                                                                                                                                              }

                                                                                                                                                                                                                                lastButtonState = buttonState;
                                                                                                                                                                                                                                }