#!/usr/bin/env python3
"""Alarm example for PyPCF8523 RTC driver.

This example demonstrates how to use the alarm functionality:
- Setting an alarm
- Checking alarm status
- Clearing an alarm

Hardware setup:
- Connect PCF8523 to Raspberry Pi I2C bus 1
- Optionally connect INT pin to a GPIO for interrupt handling
"""

import time
from pypcf8523 import PCF8523


def main():
    print("PCF8523 Alarm Example")
    print("=" * 50)

    # Initialize the RTC
    rtc = PCF8523(i2c_bus=1)

    # Get current time
    current = rtc.datetime
    print(f"Current time: {current.tm_hour:02d}:{current.tm_min:02d}:{current.tm_sec:02d}")

    # Set an alarm for 2 minutes from now
    alarm_minute = (current.tm_min + 2) % 60
    alarm_hour = current.tm_hour
    if alarm_minute < current.tm_min:  # Handle hour rollover
        alarm_hour = (alarm_hour + 1) % 24

    print(f"Setting alarm for: {alarm_hour:02d}:{alarm_minute:02d}")
    rtc.set_alarm(minute=alarm_minute, hour=alarm_hour)

    # Enable the alarm interrupt
    rtc.alarm_interrupt = True
    print("Alarm interrupt enabled")

    # Clear any existing alarm status
    rtc.alarm_status = False

    print("\nWaiting for alarm... (Press Ctrl+C to stop)")
    print("-" * 50)

    try:
        while True:
            # Read current time
            current = rtc.datetime
            time_str = f"{current.tm_hour:02d}:{current.tm_min:02d}:{current.tm_sec:02d}"

            # Check if alarm triggered
            if rtc.alarm_status:
                print(f"\n🔔 ALARM! Triggered at {time_str}")

                # Clear the alarm
                rtc.alarm_status = False
                print("Alarm cleared")

                # Optionally disable the alarm
                # rtc.clear_alarm()
                # print("Alarm disabled")

                break
            else:
                print(f"Current time: {time_str} - Waiting for alarm...", end="\r")

            time.sleep(1.0)

    except KeyboardInterrupt:
        print("\n\nExample stopped by user")
    finally:
        # Clean up
        rtc.clear_alarm()
        rtc.close()
        print("Alarm cleared and RTC connection closed")


if __name__ == "__main__":
    main()