/**
 **************************************************
 * @file        Inkplate6_RTC_Alarm.ino
 * @brief       RTC time and alarm example for Soldered Inkplate 6.
 *
 * @details     Demonstrates how to use the PCF85063 real-time clock (RTC)
 *              integrated on the Inkplate 6 board. The example shows how
 *              to set time and date, configure an alarm, read current time,
 *              and display it on the e-paper screen using partial updates.
 *
 * Requirements:
 * - Board:      Soldered Inkplate 6
 * - Hardware:   Inkplate 6, USB cable
 * - Extra:      None
 *
 * Configuration:
 * - Boards Manager -> Inkplate Boards -> Soldered Inkplate6
 * - Serial settings: 115200 baud (optional)
 *
 * Don't have Inkplate Boards in Arduino Boards Manager?
 * See https://docs.soldered.com/inkplate/6/quick-start-guide/
 *
 * How to use:
 * 1) Upload the sketch to Inkplate 6.
 * 2) If RTC is not set, initialize time and date in the code.
 * 3) The program configures an RTC alarm.
 * 4) Current time is periodically read and displayed on the screen.
 *
 * Expected output:
 * - Inkplate display shows current date and time.
 * - Alarm event can be detected and handled in the sketch.
 *
 * Notes:
 * - Inkplate 6 uses the PCF85063 RTC chip.
 * - Partial update works only in 1-bit (black & white) mode.
 * - It is not recommended to use partial update on the first refresh after power-up.
 * - Perform a full refresh every 5–10 partial updates to maintain display quality.
 *
 * Docs:         https://docs.soldered.com/inkplate
 * Support:      https://forum.soldered.com/
 *
 * @author      Soldered
 * @date        2023-02-20
 * @license     GNU GPL V3
 * 
 * **************************************************/

// Next 3 lines are a precaution, you can ignore those, and the example would also work without them
#if !defined(ARDUINO_ESP32_DEV) && !defined(ARDUINO_INKPLATE6V2)
#error "Wrong board selection for this example, please select e-radionica Inkplate6 or Soldered Inkplate6 in the boards menu."
#endif

#include "Inkplate.h"            // Include Inkplate library to the sketch
Inkplate display(INKPLATE_1BIT); // Create an object on Inkplate library and also set library into 1-bit mode (BW)

#define REFRESH_DELAY 1000 // Delay between refreshes
unsigned long time1;       // Time for measuring refresh in millis

// Set clock
uint8_t hour = 12;
uint8_t minutes = 50;
uint8_t seconds = 30;

// Set date and weekday (NOTE: In weekdays 0 means Sunday, 1 means Monday, ...)
uint8_t weekday = 1;
uint8_t day = 20;
uint8_t month = 2;
uint8_t year = 23;

// Set alarm time and date (alarm will be generated 10 seconds after board power up)
uint8_t alarmHour = 12;
uint8_t alarmMinutes = 50;
uint8_t alarmSeconds = 40;
uint8_t alarmWeekday = 1;
uint8_t alarmDay = 20;

void setup()
{
    display.begin();        // Init Inkplate library (you should call this function ONLY ONCE)
    display.clearDisplay(); // Clear frame buffer of display
    display.display();      // Put clear image on display
    display.setTextSize(4); // Set text to be 4 times bigger than classic 5x7 px text

    display.rtc.setTime(hour, minutes, seconds);                                         // Send time to RTC
    display.rtc.setDate(weekday, day, month, year);                                      // Send date to RTC
    display.rtc.setAlarm(alarmSeconds, alarmMinutes, alarmHour, alarmDay, alarmWeekday); // Set alarm
}

// Variable that keeps count on how much screen has been partially updated
int n = 0;
void loop()
{
    if ((unsigned long)(millis() - time1) > REFRESH_DELAY)
    {
        display.rtc.getRtcData();           // Get the time and date from RTC
        seconds = display.rtc.getSecond();  // Store senconds in a variable
        minutes = display.rtc.getMinute();  // Store minutes in a variable
        hour = display.rtc.getHour();       // Store hours in a variable
        day = display.rtc.getDay();         // Store day of month in a variable
        weekday = display.rtc.getWeekday(); // Store day of week in a variable
        month = display.rtc.getMonth();     // Store month in a variable
        year = display.rtc.getYear();       // Store year in a variable

        display.clearDisplay();                                       // Clear content in frame buffer
        display.setCursor(100, 300);                                  // Set position of the text
        printTime(hour, minutes, seconds, day, weekday, month, year); // Print the time on screen

        if (display.rtc.checkAlarmFlag()) // Check if alarm has occurred
        {
            display.rtc.clearAlarmFlag(); // It's recommended to clear alarm flag after alarm has occurred
            display.setCursor(400, 400); // Set new position for cursor
            display.print("ALARM!");
        }

        if (n > 9) // Check if you need to do full refresh or you can do partial update
        {
            display.display(true); // Do a full refresh
            n = 0;
        }
        else
        {
            display.partialUpdate(false, true); // Do partial update and keep e-papr power supply on
            n++;                                // Keep track on how many times screen has been partially updated
        }

        time1 = millis(); // Store current millis
    }
}

void printTime(uint8_t _hour, uint8_t _minutes, uint8_t _seconds, uint8_t _day, uint8_t _weekday, uint16_t _month,
               uint8_t _year)
{
    // Write time and date info on screen
    char *wday[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

    print2Digits(_hour);
    display.print(':');
    print2Digits(_minutes);
    display.print(':');
    print2Digits(_seconds);

    display.print(' ');

    display.print(wday[_weekday]);
    display.print(", ");
    print2Digits(_day);
    display.print('/');
    print2Digits(_month);
    display.print('/');
    display.print(_year, DEC);
}

void print2Digits(uint8_t _d)
{
    if (_d < 10)
        display.print('0');
    display.print(_d, DEC);
}
