import signal
import sys
import time
from datetime import datetime
import subprocess
from lib.slovak_datetime_formatter import get_datetime_as_slovak_sentence

if len(sys.argv) > 1 and sys.argv[1] == "test":
    import lib.dummygpio as GPIO
else:
    import RPi.GPIO as GPIO

TTS_API_URL = "https://tts.virtonline.eu/api/tts"
BUTTON_TIMEOUT = 30  # button release timeout terminates playing
PIN = 27  # listen to changes on this GPIO pin
GPIO.setmode(GPIO.BCM)  # use BCM pin layout
GPIO.setwarnings(False)


def setup_pin():
    GPIO.setup(PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)


def terminate_playing(proc):
    print("Terminating playing...")
    proc.terminate()
    proc.wait(timeout=5)
    print("Terminated")


def play_presny_cas():
    print("Playing presny_cas.wav")
    proc = subprocess.Popen(["aplay", "presny_cas.wav"])
    wait_for_button_release_or_timeout(PIN, BUTTON_TIMEOUT)
    print("GPIO went HIGH - terminating playing")
    terminate_playing(proc)


def play_beep():
    print("Playing beep.wav")
    subprocess.run(["aplay", "beep.wav"], check=True)


def get_credentials():
    with open("credentials.txt") as f:
        cred_line = f.readline().strip()
        username, password = cred_line.split(":")

    return username, password


def generate_presny_cas():
    text = get_datetime_as_slovak_sentence(datetime.now())
    print(f"Generating presny_cas.wav for '{text}' using a remote API call")
    username, password = get_credentials()
    subprocess.call(
        [
            "curl",
            "--silent",
            "-u",
            f"{username}:{password}",
            "--get",
            "--data-urlencode",
            f"text={text}",
            TTS_API_URL,
            "--output",
            "presny_cas.wav",
        ]
    )
    print("Generated presny_cas.wav")


def wait_for_button_release_or_timeout(pin, timeout):
    timeout_start = time.time()
    while time.time() < timeout_start + timeout:
        if GPIO.input(pin) == GPIO.HIGH:
            break
        time.sleep(0.05)


def handle_pin(pin):
    print(f"GPIO {pin} LOW - event triggered")
    generate_presny_cas()
    play_presny_cas()


def signal_handler(sig, frame):
    print("Interrupt received, cleaning up!")
    GPIO.cleanup()
    sys.exit(0)


signal.signal(signal.SIGINT, signal_handler)

try:
    setup_pin()
    play_beep()
    play_beep()
    GPIO.add_event_detect(PIN, GPIO.FALLING, callback=handle_pin, bouncetime=1000)
    print(f"Waiting for the GPIO {PIN} to go LOW...")
    while True:
        time.sleep(0.01)

except Exception as e:
    print("Caught exception: ", e)
    sys.exit()
finally:
    GPIO.cleanup()