"""Interface for customizing the behavior of a test fixture by executing a JavaScript file."""

from buildscripts.resmokelib import errors
from buildscripts.resmokelib.testing.hooks import interface
from buildscripts.resmokelib.testing.fixtures.interface import MultiClusterFixture
from buildscripts.resmokelib.testing.testcases import jstest
from buildscripts.resmokelib.utils import registry


class JSHook(interface.Hook):
    """A hook with a static JavaScript file to execute."""

    REGISTERED_NAME = registry.LEAVE_UNREGISTERED

    def __init__(self, hook_logger, fixture, js_filename, description, shell_options=None):
        """Initialize JSHook."""
        interface.Hook.__init__(self, hook_logger, fixture, description)
        self._js_filename = js_filename
        self._shell_options = shell_options

    def _should_run_after_test(self):
        """Provide base callback.

        Callback that can be overrided by subclasses to indicate if the JavaScript file should be
        executed after the current test.
        """
        return True

    def after_test(self, test, test_report):
        """After test execution."""
        if not self._should_run_after_test():
            return

        hook_test_case = DynamicJSTestCase.create_after_test(test.logger, test, self,
                                                             self._js_filename, self._shell_options)
        hook_test_case.configure(self.fixture)
        hook_test_case.run_dynamic_test(test_report)


class DataConsistencyHook(JSHook):
    """
    A hook for running a static JavaScript file that checks data consistency of the server.

    If the mongo shell process running the JavaScript file exits with a non-zero return code, then
    an errors.ServerFailure exception is raised to cause resmoke.py's test execution to stop.
    """

    REGISTERED_NAME = registry.LEAVE_UNREGISTERED

    def after_test(self, test, test_report):
        """After test execution."""
        try:
            JSHook.after_test(self, test, test_report)
        except errors.TestFailure as err:
            raise errors.ServerFailure(err.args[0])


class PerClusterDataConsistencyHook(DataConsistencyHook):
    """
    A hook that runs on each independent cluster of the fixture.

    The independent cluster itself may be another fixture.
    """

    REGISTERED_NAME = registry.LEAVE_UNREGISTERED

    def after_test(self, test, test_report):
        """After test execution."""

        # Break the fixture down into its participant clusters if it is a MultiClusterFixture.
        clusters = [self.fixture] if not isinstance(self.fixture, MultiClusterFixture)\
                    else self.fixture.get_independent_clusters()

        for cluster in clusters:
            self.logger.info("Running jsfile '%s' on '%s' with driver URL '%s'", self._js_filename,
                             cluster, cluster.get_driver_connection_url())
            hook_test_case = DynamicJSTestCase.create_after_test(
                test.logger, test, self, self._js_filename, self._shell_options)
            hook_test_case.configure(cluster)
            hook_test_case.run_dynamic_test(test_report)


class DynamicJSTestCase(interface.DynamicTestCase):
    """A dynamic TestCase that runs a JavaScript file."""

    def __init__(self, logger, test_name, description, base_test_name, hook, js_filename,
                 shell_options=None):
        """Initialize DynamicJSTestCase."""
        interface.DynamicTestCase.__init__(self, logger, test_name, description, base_test_name,
                                           hook)
        self._js_test_builder = jstest.JSTestCaseBuilder(logger, js_filename, self.id(),
                                                         shell_options=shell_options)
        self._js_test_case = None

    def override_logger(self, new_logger):
        """Override logger."""
        interface.DynamicTestCase.override_logger(self, new_logger)
        self._js_test_case.override_logger(new_logger)

    def reset_logger(self):
        """Reset the logger."""
        interface.DynamicTestCase.reset_logger(self)
        self._js_test_case.reset_logger()

    def configure(self, fixture, *args, **kwargs):
        """Configure the fixture."""
        super().configure(fixture, *args, **kwargs)
        self._js_test_builder.configure(fixture, *args, **kwargs)
        self._js_test_case = self._js_test_builder.create_test_case_for_thread(self.logger)

    def run_test(self):
        """Execute the test."""
        self._js_test_case.run_test()