#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""The base classes for RDFValue tests."""
import time

from grr.lib import rdfvalue
from grr.lib import type_info
from grr.lib.rdfvalues import client as rdf_client
from grr.lib.rdfvalues import flows as rdf_flows
from grr.lib.rdfvalues import paths as rdf_paths
from grr.lib.rdfvalues import rekall_types as rdf_rekall_types
from grr.lib.rdfvalues import structs as rdf_structs

from grr.server.grr_response_server import aff4
from grr.test_lib import test_lib

# pylint:mode=test


class GenericRDFProtoTest(test_lib.GRRBaseTest):

  def testNestedProtobufAssignment(self):
    """Check that we can assign a nested protobuf."""
    container = rdf_rekall_types.RekallRequest()
    pathspec = rdf_paths.PathSpec(path=r"\\.\pmem", pathtype=1)

    # Should raise - incompatible RDFType.
    self.assertRaises(ValueError, setattr, container, "device",
                      rdfvalue.RDFString("hello"))

    # Should raise - incompatible RDFProto type.
    self.assertRaises(
        ValueError,
        setattr,
        container,
        "device",
        rdf_client.StatEntry(st_size=5))

    # Assign directly.
    container.device = pathspec

    self.assertEqual(container.device.path, r"\\.\pmem")

    # Clear the field.
    container.device = None

    # Check the protobuf does not have the field set at all.
    self.assertFalse(container.HasField("device"))

  def testSimpleTypeAssignment(self):
    sample = rdf_client.StatEntry()
    sample.AddDescriptor(
        rdf_structs.ProtoRDFValue(
            name="test",
            field_number=45,
            default=rdfvalue.RDFInteger(0),
            rdf_type=rdfvalue.RDFInteger))

    self.assertIsInstance(sample.test, rdfvalue.RDFInteger)

    # Can we assign an RDFValue instance?
    sample.test = rdfvalue.RDFInteger(5)

    self.assertEqual(sample.test, 5)

    # Check that bare values can be coerced.
    sample.test = 6
    self.assertIsInstance(sample.test, rdfvalue.RDFInteger)
    self.assertEqual(sample.test, 6)

    # Assign an enum.
    sample.registry_type = sample.RegistryType.REG_DWORD
    self.assertEqual(sample.registry_type, sample.RegistryType.REG_DWORD)

    sample.registry_type = rdf_client.StatEntry.RegistryType.REG_SZ
    self.assertEqual(sample.registry_type, sample.RegistryType.REG_SZ)

    # We can also assign the string value.
    sample.registry_type = "REG_QWORD"
    self.assertEqual(sample.registry_type, sample.RegistryType.REG_QWORD)

    # Check that coercing works.
    sample.test = "10"
    self.assertEqual(sample.test, 10)

    # Assign an RDFValue which can not be coerced.
    self.assertRaises(type_info.TypeValueError, setattr, sample, "test",
                      rdfvalue.RDFString("hello"))

  def testComplexConstruction(self):
    """Test that we can construct RDFProtos with nested fields."""
    pathspec = rdf_paths.PathSpec(
        path="/foobar", pathtype=rdf_paths.PathSpec.PathType.TSK)
    sample = rdf_client.StatEntry(pathspec=pathspec, st_size=5)

    self.assertEqual(sample.pathspec.path, "/foobar")
    self.assertEqual(sample.st_size, 5)

    self.assertRaises(AttributeError, rdf_client.StatEntry, foobar=1)

  def testUnicodeSupport(self):
    pathspec = rdf_paths.PathSpec(
        path="/foobar", pathtype=rdf_paths.PathSpec.PathType.TSK)
    pathspec.path = u"Grüezi"

    self.assertEqual(pathspec.path, u"Grüezi")

  def testRDFTypes(self):
    """Test that types are properly serialized."""
    # Create an object to carry attributes
    obj = aff4.FACTORY.Create("foobar", aff4.AFF4Object, token=self.token)

    # Make a url object
    str_url = "aff4:/users"
    url = rdfvalue.RDFURN(str_url, age=1)

    # Store it
    # We must use a proper Attribute() instance
    self.assertRaises(AttributeError, obj.Set, "aff4:stored", url)
    self.assertRaises(ValueError, obj.Set, obj.Schema.STORED, str_url)

    old_time = time.time
    try:
      time.time = lambda: 100

      obj.Set(obj.Schema.STORED, url)
      obj.Close()

      # Check that its ok
      obj = aff4.FACTORY.Open("foobar", token=self.token)
      url = obj.Get(obj.Schema.STORED)

      # It must be a real RDFURN and be the same as the original string
      self.assertEqual(url.__class__, rdfvalue.RDFURN)
      self.assertEqual(str(url), str_url)

      # The time of the stored property reflects the time of the Set() call.
      self.assertEqual(url.age, 100 * 1e6)

    finally:
      time.time = old_time

  def testRepeatedFields(self):
    """Test handling of protobuf repeated fields."""
    sample = rdf_client.Interface()

    # Add a simple string.
    sample.ip4_addresses.Append("127.0.0.1")

    self.assertEqual(sample.ip4_addresses[0], "127.0.0.1")

    # Add an invalid type.
    self.assertRaises(type_info.TypeValueError, sample.addresses.Append, 2)

    # Add a protobuf
    sample.addresses.Append(human_readable="127.0.0.1")

    self.assertEqual(sample.addresses[0].human_readable, "127.0.0.1")
    self.assertEqual(len(sample.addresses), 1)

  def testEnums(self):
    """Check that enums are wrapped in a descriptor class."""
    sample = rdf_flows.GrrStatus()
    self.assertEqual(str(sample.status), "OK")


class RDFValueTestMixin(object):
  """The base class for testing RDFValue implementations."""

  # This should be overridden by the RDFValue class we want to test.
  rdfvalue_class = lambda *args, **kw: None

  __abstract = True  # Do not register this class so pylint: disable=g-bad-name

  def GenerateSample(self, number=0):
    """Create a pre-populated instance of the RDFValue.

    Args:
      number: A sample number. Derived classes should return a different sample
        for each number.
    """
    _ = number
    return self.rdfvalue_class()

  def CheckRDFValue(self, value, sample):
    """Check that the rdfproto is the same as the sample."""
    self.assertIsInstance(sample, self.rdfvalue_class)
    self.assertIsInstance(value, self.rdfvalue_class)

    self.assertRDFValuesEqual(value, sample)

  def testComparisons(self):
    """Checks that object comparisons work."""
    sample1 = self.GenerateSample(1)

    self.assertTrue(sample1 == self.GenerateSample(1))
    self.assertFalse(sample1 == self.GenerateSample(2))
    self.assertTrue(sample1 != self.GenerateSample(2))
    self.assertFalse(sample1 != self.GenerateSample(1))

  def testHashability(self):
    """RDFValue instances need to act as keys in a dict."""
    sample1 = self.GenerateSample(1)

    # Different instances with the same value need to hash to the same.
    self.assertTrue(hash(sample1) == hash(self.GenerateSample(1)))
    self.assertTrue(hash(sample1) != hash(self.GenerateSample(2)))

  def testInitialization(self):
    """Check that we can use an empty initializer.

    RDFValues are created in many different ways, sometimes in stages by
    gradually populating fields. The only time you can be sure the user has
    finished creating a proto is when it is serialized. This means strong
    validation that requires all fields populated can't be done in init, but
    should be done in SerializeToString.
    """
    self.rdfvalue_class()

    # Initialize from another instance.
    sample = self.GenerateSample()

    self.CheckRDFValue(self.rdfvalue_class(sample), sample)

  def testSerialization(self, sample=None):
    """Make sure the RDFValue instance can be serialized."""
    if sample is None:
      sample = self.GenerateSample()

    # Serializing to a string must produce a string.
    serialized = sample.SerializeToString()
    self.assertIsInstance(serialized, str)

    # Ensure we can parse it again.
    rdfvalue_object = self.rdfvalue_class.FromSerializedString(serialized)
    self.CheckRDFValue(rdfvalue_object, sample)

    # Serializing to data store must produce something the data store can
    # handle.
    serialized = sample.SerializeToDataStore()

    if self.rdfvalue_class.data_store_type == "bytes":
      self.assertIsInstance(serialized, str)
    elif self.rdfvalue_class.data_store_type == "string":
      self.assertIsInstance(serialized, unicode)
    elif self.rdfvalue_class.data_store_type in ["unsigned_integer", "integer"]:
      self.assertIsInstance(serialized, (int, long))
    else:
      self.fail("%s has no valid data_store_type" % self.rdfvalue_class)

    # Ensure we can parse it again.
    rdfvalue_object = self.rdfvalue_class.FromDatastoreValue(serialized)
    self.CheckRDFValue(rdfvalue_object, sample)


class RDFProtoTestMixin(RDFValueTestMixin):
  """A harness for testing RDFProto implementations."""

  __abstract = True  # Do not register this class so pylint: disable=g-bad-name

  def testInitializationEx(self):
    """Check we can initialize from additional parts."""
    sample = self.GenerateSample()

    # RDFProto can be initialized from a serialized protobuf.
    serialized = sample.SerializeToString()
    rdfvalue_sample = self.rdfvalue_class.FromSerializedString(serialized)
    self.CheckRDFValue(rdfvalue_sample, sample)

    # RDFProto can be initialized from another RDFProto.
    new_rdfvalue_sample = self.rdfvalue_class(rdfvalue_sample)
    self.CheckRDFValue(new_rdfvalue_sample, rdfvalue_sample)

    # In this case the ages should be identical
    self.assertEqual(int(new_rdfvalue_sample.age), int(rdfvalue_sample.age))
