#include <GxEPD2_BW.h>
#include <Adafruit_GFX.h>

// ==================================================
// ESP32 DevKit + 2.9" E-Paper 296x128
// ==================================================

#define EPD_CS    5
#define EPD_DC    17
#define EPD_RST   16
#define EPD_BUSY  4

// Common 2.9" 296x128 Waveshare panel
GxEPD2_BW<GxEPD2_290_T5,
          GxEPD2_290_T5::HEIGHT> display(
            GxEPD2_290_T5(
              EPD_CS,
              EPD_DC,
              EPD_RST,
              EPD_BUSY
            )
          );

// ==================================================
// Draw To-Do Checklist
// ==================================================

void drawChecklist()
{
  display.setFullWindow();

  display.firstPage();

  do
  {
    // White background
    display.fillScreen(GxEPD_WHITE);

    display.setTextColor(GxEPD_BLACK);
    display.setFont(NULL);

    // -----------------------------------------------
    // TITLE
    // -----------------------------------------------

    display.setTextSize(2);
    display.setCursor(108, 20);
    display.print("TODAY");

    // Title line
    display.drawLine(85, 27, 210, 27, GxEPD_BLACK);

    // -----------------------------------------------
    // 1. MORNING WALK - CHECKED
    // -----------------------------------------------

    display.drawRect(12, 34, 17, 17, GxEPD_BLACK);

    // Check mark
    display.drawLine(15, 42, 20, 47, GxEPD_BLACK);
    display.drawLine(20, 47, 27, 37, GxEPD_BLACK);

    display.setTextSize(1);
    display.setCursor(38, 47);
    display.print("Morning Walk");

    display.drawLine(8, 55, 288, 55, GxEPD_BLACK);

    // -----------------------------------------------
    // 2. READ BOOK - CHECKED
    // -----------------------------------------------

    display.drawRect(12, 61, 17, 17, GxEPD_BLACK);

    display.drawLine(15, 69, 20, 74, GxEPD_BLACK);
    display.drawLine(20, 74, 27, 64, GxEPD_BLACK);

    display.setCursor(38, 74);
    display.print("Read Book");

    display.drawLine(8, 82, 288, 82, GxEPD_BLACK);

    // -----------------------------------------------
    // 3. WORK ON PROJECT
    // -----------------------------------------------

    display.drawRect(12, 88, 17, 17, GxEPD_BLACK);

    display.setCursor(38, 101);
    display.print("Work on Project");

    display.drawLine(8, 109, 288, 109, GxEPD_BLACK);

    // -----------------------------------------------
    // 4. CALL MOM
    // -----------------------------------------------

    display.drawRect(12, 115, 17, 17, GxEPD_BLACK);

    display.setCursor(38, 128);
    display.print("Call Mom");

  }
  while (display.nextPage());
}


// ==================================================
// SETUP
// ==================================================

void setup()
{
  Serial.begin(115200);

  Serial.println();
  Serial.println("ESP32 + 2.9 inch E-Paper");
  Serial.println("To-Do Checklist");

  display.init(115200);

  // Landscape
  display.setRotation(1);

  drawChecklist();

  Serial.println("Checklist displayed.");
}


// ==================================================
// LOOP
// ==================================================

void loop()
{
  // E-paper retains the image.
  // No continuous refresh required.

  delay(1000);
}