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from kafkatest.directory_layout.kafka_path import create_path_resolver, KafkaSystemTestPathResolver, \
    KAFKA_PATH_RESOLVER_KEY
from kafkatest.version import V_2_1_0, DEV_BRANCH, KafkaVersion


class DummyContext(object):
    def __init__(self):
        self.globals = {}


class DummyPathResolver(object):
    """Dummy class to help check path resolver creation."""
    def __init__(self, context, project_name):
        pass

class DummyNode(object):
    """Fake node object"""
    pass

class CheckCreatePathResolver(object):
    def check_create_path_resolver_override(self):
        """Test override behavior when instantiating a path resolver using our factory function.

        If context.globals has an entry for a path resolver class, use that class instead of the default.
        """
        mock_context = DummyContext()
        mock_context.globals[KAFKA_PATH_RESOLVER_KEY] = \
            "unit.directory_layout.check_project_paths.DummyPathResolver"

        resolver = create_path_resolver(mock_context)
        assert type(resolver) == DummyPathResolver

    def check_create_path_resolver_default(self):
        """Test default behavior when instantiating a path resolver using our factory function.
        """
        resolver = create_path_resolver(DummyContext())
        assert type(resolver) == KafkaSystemTestPathResolver

    def check_paths(self):
        """Check expected path resolution without any version specified."""
        resolver = create_path_resolver(DummyContext())

        assert resolver.home() == "/opt/kafka-dev"
        assert resolver.bin() == "/opt/kafka-dev/bin"
        assert resolver.script("kafka-run-class.sh") == "/opt/kafka-dev/bin/kafka-run-class.sh"

    def check_versioned_source_paths(self):
        """Check expected paths when using versions."""
        resolver = create_path_resolver(DummyContext())

        assert resolver.home(V_2_1_0) == "/opt/kafka-2.1.0"
        assert resolver.bin(V_2_1_0) == "/opt/kafka-2.1.0/bin"
        assert resolver.script("kafka-run-class.sh", V_2_1_0) == "/opt/kafka-2.1.0/bin/kafka-run-class.sh"

    def check_node_or_version_helper(self):
        """KafkaSystemTestPathResolver has a helper method which can take a node or version, and returns the version.
        Check expected behavior here.
        """
        resolver = create_path_resolver(DummyContext())

        # Node with no version attribute should resolve to DEV_BRANCH
        node = DummyNode()
        assert resolver._version(node) == DEV_BRANCH

        # Node with version attribute should resolve to the version attribute
        node.version = V_2_1_0
        assert resolver._version(node) == V_2_1_0

        # A KafkaVersion object should resolve to itself
        assert resolver._version(DEV_BRANCH) == DEV_BRANCH
        version = KafkaVersion("999.999.999")
        assert resolver._version(version) == version