import time
import threading
import grovepi
from sensors.lock import safe_grove_access
from shared import config

BUZZER_PIN = 8  # Must be a PWM pin on GrovePi (D3, D5, D6, D8 support analogWrite)

# Initialize pin mode safely
try:
    with safe_grove_access(timeout=1.0) as acquired:
        if acquired:
            grovepi.pinMode(BUZZER_PIN, "OUTPUT")
except Exception as e:
    print(f"[BUZZER] Init error: {e}")

def _stop_sound():
    """Helper to ensure sound is silenced safely under lock."""
    with safe_grove_access(timeout=1.0) as acquired:
        if acquired:
            try:
                grovepi.analogWrite(BUZZER_PIN, 0)
                grovepi.digitalWrite(BUZZER_PIN, 0)
            except Exception:
                pass

def _siren_worker(beats_nb: int, delay: float):
    if not config.BUZZER_ACTIVATED:
        return

    try:
        for _ in range(beats_nb):
            # 1. Turn sound ON (only acquire lock briefly for the I2C write)
            with safe_grove_access(timeout=1.0) as acquired:
                if acquired:
                    grovepi.analogWrite(BUZZER_PIN, 128)
            time.sleep(delay)  # Sleep WITHOUT holding the lock!
            
            # 2. Turn sound OFF
            with safe_grove_access(timeout=1.0) as acquired:
                if acquired:
                    grovepi.analogWrite(BUZZER_PIN, 0)
            time.sleep(delay)  # Sleep WITHOUT holding the lock!
    except Exception as e:
        print(f"[BUZZER] Error during siren execution: {e}")
    finally:
        _stop_sound()

def buzzer_siren(beats_nb: int = 3, delay: float = 0.2, async_run: bool = True):
    if async_run:
        thread = threading.Thread(target=_siren_worker, args=(beats_nb, delay), daemon=True)
        thread.start()
    else:
        _siren_worker(beats_nb, delay)