import os
import subprocess
import tempfile
import time
from pathlib import Path
from threading import Thread


class ScreenshotManager:
    def __init__(self):
        self.__config_path = os.environ.get("CONFIG_FILE", "/data/config.conf")
        self.data_path = tempfile.gettempdir()

        if not Path(self.__config_path).is_file():
            raise ValueError("Invalid Configuration")

    def stop(self):
        self.__pending_shutdown = True
        self.__loop_thread.join()

    def start(self):
        self.__pending_shutdown = False
        self.__loop_thread = Thread(target=self.__loop)
        self.__loop_thread.start()

    def __loop(self):
        counter = 0
        while not self.__pending_shutdown:
            if counter % 900 == 0:
                subprocess.run(
                    ["shot-scraper", "multi", self.__config_path], cwd=self.data_path
                )
            time.sleep(1)
            counter += 1