"""Development entrypoint (Flask dev server, port 5001).

For production use Gunicorn via `start:app` (see start.py and Dockerfile).
"""
import os
import sys

os.chdir(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from backend.app import create_app
from backend.scheduler import start_scheduler, stop_scheduler, try_acquire_scheduler_lock

db_url = os.environ.get("DATABASE_URL",
                        "postgresql://iot:iot@localhost:5432/iot_dboard")
app = create_app(db_path=db_url)

if __name__ == "__main__":
    DEBUG = os.environ.get("FLASK_DEBUG", "").lower() in ("1", "true", "yes")

    # In debug mode the reloader re-imports this module; only the child process
    # should start the scheduler (advisory lock keeps it single anyway).
    is_reloader_child = os.environ.get("WERKZEUG_RUN_MAIN") == "true"
    if not DEBUG or is_reloader_child:
        if try_acquire_scheduler_lock(db_url):
            start_scheduler(app)

    try:
        bind_host = os.environ.get("FLASK_BIND", "127.0.0.1")
        app.run(host=bind_host, port=int(os.environ.get("FLASK_PORT", "5001")),
                debug=DEBUG, threaded=True)
    finally:
        if not DEBUG or is_reloader_child:
            stop_scheduler()