"""Testing utils for jupyter_client tests

"""
import os
pjoin = os.path.join
try:
    from unittest.mock import patch
except ImportError:
    from mock import patch

from ipython_genutils.tempdir import TemporaryDirectory

class test_env(object):
    """Set Jupyter path variables to a temporary directory
    
    Useful as a context manager or with explicit start/stop
    """
    def start(self):
        self.test_dir = td = TemporaryDirectory()
        self.env_patch = patch.dict(os.environ, {
            'JUPYTER_CONFIG_DIR': pjoin(td.name, 'jupyter'),
            'JUPYTER_DATA_DIR': pjoin(td.name, 'jupyter_data'),
            'JUPYTER_RUNTIME_DIR': pjoin(td.name, 'jupyter_runtime'),
            'IPYTHONDIR': pjoin(td.name, 'ipython'),
        })
        self.env_patch.start()
    
    def stop(self):
        self.env_patch.stop()
        self.test_dir.cleanup()
    
    def __enter__(self):
        self.start()
        return self.test_dir.name
    
    def __exit__(self, *exc_info):
        self.stop()

def execute(code='', kc=None, **kwargs):
    """wrapper for doing common steps for validating an execution request"""
    from .test_message_spec import validate_message
    if kc is None:
        kc = KC
    msg_id = kc.execute(code=code, **kwargs)
    reply = kc.get_shell_msg(timeout=TIMEOUT)
    validate_message(reply, 'execute_reply', msg_id)
    busy = kc.get_iopub_msg(timeout=TIMEOUT)
    validate_message(busy, 'status', msg_id)
    nt.assert_equal(busy['content']['execution_state'], 'busy')

    if not kwargs.get('silent'):
        execute_input = kc.get_iopub_msg(timeout=TIMEOUT)
        validate_message(execute_input, 'execute_input', msg_id)
        nt.assert_equal(execute_input['content']['code'], code)

    return msg_id, reply['content']
