__all__ = 'run',

from . import coroutines
from . import events
from . import tasks


def run(main, *, debug=False):
 """Run a coroutine.

 This function runs the passed coroutine, taking care of
 managing the asyncio event loop and finalizing asynchronous
 generators.

 This function cannot be called when another asyncio event loop is
 running in the same thread.

 If debug is True, the event loop will be run in debug mode.

 This function always creates a new event loop and closes it at the end.
 It should be used as a main entry point for asyncio programs, and should
 ideally only be called once.

 Example:

 async def main():
 await asyncio.sleep(1)
 print('hello')

 asyncio.run(main())
 """
 if events._get_running_loop() is not None:
 raise RuntimeError(
 "asyncio.run() cannot be called from a running event loop")

 if not coroutines.iscoroutine(main):
 raise ValueError("a coroutine was expected, got {!r}".format(main))

 loop = events.new_event_loop()
 try:
 events.set_event_loop(loop)
 loop.set_debug(debug)
 return loop.run_until_complete(main)
 finally:
 try:
 _cancel_all_tasks(loop)
 loop.run_until_complete(loop.shutdown_asyncgens())
 finally:
 events.set_event_loop(None)
 loop.close()


def _cancel_all_tasks(loop):
 to_cancel = tasks.all_tasks(loop)
 if not to_cancel:
 return

 for task in to_cancel:
 task.cancel()

 loop.run_until_complete(
 tasks.gather(*to_cancel, loop=loop, return_exceptions=True))

 for task in to_cancel:
 if task.cancelled():
 continue
 if task.exception() is not None:
 loop.call_exception_handler({
 'message': 'unhandled exception during asyncio.run() shutdown',
 'exception': task.exception(),
 'task': task,
 })