import numpy as np
import time
from datetime import datetime

FIFO_PATH = "/tmp/esp32_audio"
SAMPLE_RATE = 16000
CHANNELS = 2          # set to 1 if mono
BLOCK_FRAMES = 512    # ~32 ms at 16 kHz
BYTES_PER_SAMPLE = 2  # s16le

MARGIN = 3.0          # multiplier above baseline
ALPHA = 0.01          # smoothing factor for rolling baseline
COOLDOWN = 0.5   # seconds to ignore after a trigger

def read_block(f, block_bytes):
    data = f.read(block_bytes)
    if not data:
        return None
    return np.frombuffer(data, dtype=np.int16)

def main():
    block_bytes = BLOCK_FRAMES * CHANNELS * BYTES_PER_SAMPLE

    with open(FIFO_PATH, "rb") as f:
        print("Listening with rolling baseline + cooldown...")
        baseline = None
        last_trigger = 0

        while True:
            audio = read_block(f, block_bytes)
            if audio is None:
                continue

            if CHANNELS == 2:
                left = audio[0::2]
                right = audio[1::2]
                left_peak = np.max(np.abs(left))
                right_peak = np.max(np.abs(right))
                current_level = (left_peak + right_peak) / 2
            else:
                current_level = np.max(np.abs(audio))

            if baseline is None:
                baseline = current_level
                continue

            baseline = (1 - ALPHA) * baseline + ALPHA * current_level
            threshold = baseline * MARGIN

            now = time.time()
            if now - last_trigger < COOLDOWN:
                continue  # skip triggers during cooldown

            if CHANNELS == 2:
                if left_peak > threshold or right_peak > threshold:
                    louder = "LEFT" if left_peak > right_peak else "RIGHT"
                    ts = datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")[:-3]
                    print(f"[{ts}] Loud noise! {louder} channel louder "
                          f"(L={left_peak}, R={right_peak}, baseline={baseline:.1f})")
                    last_trigger = now
            else:
                if current_level > threshold:
                    ts = datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")[:-3]
                    print(f"[{ts}] Loud noise! Peak={current_level}, baseline={baseline:.1f}")
                    last_trigger = now

if __name__ == "__main__":
    main()