import logging
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
import time
import os

from .config import SOURCE_DIRECTORY


logger = logging.getLogger("stsg")


def build():
    print("building")


class CustomFileSystemEventHandler(FileSystemEventHandler):
    def on_modified(self, event):
        if event.is_directory:
            return

        filename = os.path.basename(event.src_path)
        if filename.startswith('.') or filename.endswith(('~', '.tmp', '.swp')):
            return

        logger.info("%s changed, building", event.src_path)
        build()



def build_on_change():
    print("build on change")
    build()

    observer = Observer()
    observer.schedule(CustomFileSystemEventHandler(), path=SOURCE_DIRECTORY, recursive=True)
    observer.start()


    try:
        while True:
            time.sleep(1)  # Keeps the thread alive
    except KeyboardInterrupt:
        observer.stop()
    observer.join()