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import logging

from webkitpy.layout_tests.port.base import Port
from webkitpy.layout_tests.models.test_configuration import TestConfiguration


_log = logging.getLogger(__name__)


class ApplePort(Port):
    """Shared logic between all of Apple's ports."""

    # This is used to represent the version of an operating system
    # corresponding to the "mac" or "win" base LayoutTests/platform
    # directory.  I'm not sure this concept is very useful,
    # but it gives us a way to refer to fallback paths *only* including
    # the base directory.
    # This is mostly done because TestConfiguration assumes that self.version()
    # will never return None. (None would be another way to represent this concept.)
    # Apple supposedly has explicit "future" results which are kept in an internal repository.
    # It's possible that Apple would want to fix this code to work better with those results.
    FUTURE_VERSION = 'future'  # FIXME: This whole 'future' thing feels like a hack.

    @classmethod
    def determine_full_port_name(cls, host, options, port_name):
        # If the port_name matches the (badly named) cls.port_name, that
        # means that they passed 'mac' or 'win' and didn't specify a version.
        # That convention means that we're supposed to use the version currently
        # being run, so this won't work if you're not on mac or win (respectively).
        # If you're not on the o/s in question, you must specify a full version or -future (cf. above).
        if port_name == cls.port_name:
            assert port_name == host.platform.os_name
            return cls.port_name + '-' + host.platform.os_version
        if port_name == cls.port_name + '-wk2':
            assert port_name == host.platform.os_name + '-wk2'
            return cls.port_name + '-' + host.platform.os_version + '-wk2'
        return port_name

    def _strip_port_name_prefix(self, port_name):
        # Callers treat this return value as the "version", which only works
        # because Apple ports use a simple name-version port_name scheme.
        # FIXME: This parsing wouldn't be needed if port_name handling was moved to factory.py
        # instead of the individual port constructors.
        return port_name[len(self.port_name + '-'):]

    def __init__(self, host, port_name, **kwargs):
        super(ApplePort, self).__init__(host, port_name, **kwargs)

        allowed_port_names = self.VERSION_FALLBACK_ORDER + [self.operating_system() + "-future"]
        port_name = port_name.replace('-wk2', '')
        self._version = self._strip_port_name_prefix(port_name)
        assert port_name in allowed_port_names, "%s is not in %s" % (port_name, allowed_port_names)

    def _skipped_file_search_paths(self):
        # We don't have a dedicated Skipped file for the most recent version of the port;
        # we just use the one in platform/{mac,win}
        most_recent_name = self.VERSION_FALLBACK_ORDER[-1]
        return set(filter(lambda name: name != most_recent_name, super(ApplePort, self)._skipped_file_search_paths()))

    # FIXME: A more sophisticated version of this function should move to WebKitPort and replace all calls to name().
    # This is also a misleading name, since 'mac-future' gets remapped to 'mac'.
    def _port_name_with_version(self):
        return self.name().replace('-future', '').replace('-wk2', '')

    def _generate_all_test_configurations(self):
        configurations = []
        for port_name in self.VERSION_FALLBACK_ORDER:
            for build_type in self.ALL_BUILD_TYPES:
                for architecture in self.ARCHITECTURES:
                    configurations.append(TestConfiguration(version=self._strip_port_name_prefix(port_name), architecture=architecture, build_type=build_type))
        return configurations

    def expectations_files(self):
        return [self._filesystem.join(self._webkit_baseline_path(d), 'TestExpectations') for d in self._skipped_file_search_paths()]