#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import shutil
import stat
import tempfile
import threading
import time
import unittest
from collections import namedtuple

from pyspark import SparkConf, SparkFiles, SparkContext
from pyspark.testing.utils import ReusedPySparkTestCase, PySparkTestCase, QuietTest, SPARK_HOME


class CheckpointTests(ReusedPySparkTestCase):

    def setUp(self):
        self.checkpointDir = tempfile.NamedTemporaryFile(delete=False)
        os.unlink(self.checkpointDir.name)
        self.sc.setCheckpointDir(self.checkpointDir.name)

    def tearDown(self):
        shutil.rmtree(self.checkpointDir.name)

    def test_basic_checkpointing(self):
        parCollection = self.sc.parallelize([1, 2, 3, 4])
        flatMappedRDD = parCollection.flatMap(lambda x: range(1, x + 1))

        self.assertFalse(flatMappedRDD.isCheckpointed())
        self.assertTrue(flatMappedRDD.getCheckpointFile() is None)
        self.assertFalse(self.sc.getCheckpointDir() is None)

        flatMappedRDD.checkpoint()
        result = flatMappedRDD.collect()
        time.sleep(1)  # 1 second
        self.assertTrue(flatMappedRDD.isCheckpointed())
        self.assertEqual(flatMappedRDD.collect(), result)
        self.assertEqual("file:" + self.checkpointDir.name,
                         os.path.dirname(os.path.dirname(flatMappedRDD.getCheckpointFile())))
        self.assertEqual(self.sc.getCheckpointDir(),
                         os.path.dirname(flatMappedRDD.getCheckpointFile()))

    def test_checkpoint_and_restore(self):
        parCollection = self.sc.parallelize([1, 2, 3, 4])
        flatMappedRDD = parCollection.flatMap(lambda x: [x])

        self.assertFalse(flatMappedRDD.isCheckpointed())
        self.assertTrue(flatMappedRDD.getCheckpointFile() is None)

        flatMappedRDD.checkpoint()
        flatMappedRDD.count()  # forces a checkpoint to be computed
        time.sleep(1)  # 1 second

        self.assertTrue(flatMappedRDD.getCheckpointFile() is not None)
        recovered = self.sc._checkpointFile(flatMappedRDD.getCheckpointFile(),
                                            flatMappedRDD._jrdd_deserializer)
        self.assertEqual([1, 2, 3, 4], recovered.collect())


class LocalCheckpointTests(ReusedPySparkTestCase):

    def test_basic_localcheckpointing(self):
        parCollection = self.sc.parallelize([1, 2, 3, 4])
        flatMappedRDD = parCollection.flatMap(lambda x: range(1, x + 1))

        self.assertFalse(flatMappedRDD.isCheckpointed())
        self.assertFalse(flatMappedRDD.isLocallyCheckpointed())

        flatMappedRDD.localCheckpoint()
        result = flatMappedRDD.collect()
        time.sleep(1)  # 1 second
        self.assertTrue(flatMappedRDD.isCheckpointed())
        self.assertTrue(flatMappedRDD.isLocallyCheckpointed())
        self.assertEqual(flatMappedRDD.collect(), result)


class AddFileTests(PySparkTestCase):

    def test_add_py_file(self):
        # To ensure that we're actually testing addPyFile's effects, check that
        # this job fails due to `userlibrary` not being on the Python path:
        # disable logging in log4j temporarily
        def func(x):
            from userlibrary import UserClass  # type: ignore
            return UserClass().hello()
        with QuietTest(self.sc):
            self.assertRaises(Exception, self.sc.parallelize(range(2)).map(func).first)

        # Add the file, so the job should now succeed:
        path = os.path.join(SPARK_HOME, "python/test_support/userlibrary.py")
        self.sc.addPyFile(path)
        res = self.sc.parallelize(range(2)).map(func).first()
        self.assertEqual("Hello World!", res)

    def test_add_file_locally(self):
        path = os.path.join(SPARK_HOME, "python/test_support/hello/hello.txt")
        self.sc.addFile(path)
        download_path = SparkFiles.get("hello.txt")
        self.assertNotEqual(path, download_path)
        with open(download_path) as test_file:
            self.assertEqual("Hello World!\n", test_file.readline())

    def test_add_file_recursively_locally(self):
        path = os.path.join(SPARK_HOME, "python/test_support/hello")
        self.sc.addFile(path, True)
        download_path = SparkFiles.get("hello")
        self.assertNotEqual(path, download_path)
        with open(download_path + "/hello.txt") as test_file:
            self.assertEqual("Hello World!\n", test_file.readline())
        with open(download_path + "/sub_hello/sub_hello.txt") as test_file:
            self.assertEqual("Sub Hello World!\n", test_file.readline())

    def test_add_py_file_locally(self):
        # To ensure that we're actually testing addPyFile's effects, check that
        # this fails due to `userlibrary` not being on the Python path:
        def func():
            from userlibrary import UserClass  # noqa: F401
        self.assertRaises(ImportError, func)
        path = os.path.join(SPARK_HOME, "python/test_support/userlibrary.py")
        self.sc.addPyFile(path)
        from userlibrary import UserClass
        self.assertEqual("Hello World!", UserClass().hello())

    def test_add_egg_file_locally(self):
        # To ensure that we're actually testing addPyFile's effects, check that
        # this fails due to `userlibrary` not being on the Python path:
        def func():
            from userlib import UserClass  # type: ignore[import]
            UserClass()
        self.assertRaises(ImportError, func)
        path = os.path.join(SPARK_HOME, "python/test_support/userlib-0.1.zip")
        self.sc.addPyFile(path)
        from userlib import UserClass
        self.assertEqual("Hello World from inside a package!", UserClass().hello())

    def test_overwrite_system_module(self):
        self.sc.addPyFile(os.path.join(SPARK_HOME, "python/test_support/SimpleHTTPServer.py"))

        import SimpleHTTPServer  # type: ignore[import]
        self.assertEqual("My Server", SimpleHTTPServer.__name__)

        def func(x):
            import SimpleHTTPServer  # type: ignore[import]
            return SimpleHTTPServer.__name__

        self.assertEqual(["My Server"], self.sc.parallelize(range(1)).map(func).collect())


class ContextTests(unittest.TestCase):

    def test_failed_sparkcontext_creation(self):
        # Regression test for SPARK-1550
        self.assertRaises(Exception, lambda: SparkContext("an-invalid-master-name"))

    def test_get_or_create(self):
        with SparkContext.getOrCreate() as sc:
            self.assertTrue(SparkContext.getOrCreate() is sc)

    def test_parallelize_eager_cleanup(self):
        with SparkContext() as sc:
            temp_files = os.listdir(sc._temp_dir)
            rdd = sc.parallelize([0, 1, 2])
            post_parallelize_temp_files = os.listdir(sc._temp_dir)
            self.assertEqual(temp_files, post_parallelize_temp_files)

    def test_set_conf(self):
        # This is for an internal use case. When there is an existing SparkContext,
        # SparkSession's builder needs to set configs into SparkContext's conf.
        sc = SparkContext()
        sc._conf.set("spark.test.SPARK16224", "SPARK16224")
        self.assertEqual(sc._jsc.sc().conf().get("spark.test.SPARK16224"), "SPARK16224")
        sc.stop()

    def test_stop(self):
        sc = SparkContext()
        self.assertNotEqual(SparkContext._active_spark_context, None)
        sc.stop()
        self.assertEqual(SparkContext._active_spark_context, None)

    def test_with(self):
        with SparkContext() as sc:
            self.assertNotEqual(SparkContext._active_spark_context, None)
        self.assertEqual(SparkContext._active_spark_context, None)

    def test_with_exception(self):
        try:
            with SparkContext() as sc:
                self.assertNotEqual(SparkContext._active_spark_context, None)
                raise Exception()
        except:
            pass
        self.assertEqual(SparkContext._active_spark_context, None)

    def test_with_stop(self):
        with SparkContext() as sc:
            self.assertNotEqual(SparkContext._active_spark_context, None)
            sc.stop()
        self.assertEqual(SparkContext._active_spark_context, None)

    def test_progress_api(self):
        with SparkContext() as sc:
            sc.setJobGroup('test_progress_api', '', True)
            rdd = sc.parallelize(range(10)).map(lambda x: time.sleep(100))

            def run():
                # When thread is pinned, job group should be set for each thread for now.
                # Local properties seem not being inherited like Scala side does.
                if os.environ.get("PYSPARK_PIN_THREAD", "false").lower() == "true":
                    sc.setJobGroup('test_progress_api', '', True)
                try:
                    rdd.count()
                except Exception:
                    pass
            t = threading.Thread(target=run)
            t.daemon = True
            t.start()
            # wait for scheduler to start
            time.sleep(1)

            tracker = sc.statusTracker()
            jobIds = tracker.getJobIdsForGroup('test_progress_api')
            self.assertEqual(1, len(jobIds))
            job = tracker.getJobInfo(jobIds[0])
            self.assertEqual(1, len(job.stageIds))
            stage = tracker.getStageInfo(job.stageIds[0])
            self.assertEqual(rdd.getNumPartitions(), stage.numTasks)

            sc.cancelAllJobs()
            t.join()
            # wait for event listener to update the status
            time.sleep(1)

            job = tracker.getJobInfo(jobIds[0])
            self.assertEqual('FAILED', job.status)
            self.assertEqual([], tracker.getActiveJobsIds())
            self.assertEqual([], tracker.getActiveStageIds())

            sc.stop()

    def test_startTime(self):
        with SparkContext() as sc:
            self.assertGreater(sc.startTime, 0)

    def test_forbid_insecure_gateway(self):
        # Fail immediately if you try to create a SparkContext
        # with an insecure gateway
        parameters = namedtuple('MockGatewayParameters', 'auth_token')(None)
        mock_insecure_gateway = namedtuple('MockJavaGateway', 'gateway_parameters')(parameters)
        with self.assertRaises(ValueError) as context:
            SparkContext(gateway=mock_insecure_gateway)
        self.assertIn("insecure Py4j gateway", str(context.exception))

    def test_resources(self):
        """Test the resources are empty by default."""
        with SparkContext() as sc:
            resources = sc.resources
            self.assertEqual(len(resources), 0)

    def test_disallow_to_create_spark_context_in_executors(self):
        # SPARK-32160: SparkContext should not be created in executors.
        with SparkContext("local-cluster[3, 1, 1024]") as sc:
            with self.assertRaises(Exception) as context:
                sc.range(2).foreach(lambda _: SparkContext())
            self.assertIn("SparkContext should only be created and accessed on the driver.",
                          str(context.exception))

    def test_allow_to_create_spark_context_in_executors(self):
        # SPARK-32160: SparkContext can be created in executors if the config is set.

        def create_spark_context():
            conf = SparkConf().set("spark.executor.allowSparkContext", "true")
            with SparkContext(conf=conf):
                pass

        with SparkContext("local-cluster[3, 1, 1024]") as sc:
            sc.range(2).foreach(lambda _: create_spark_context())


class ContextTestsWithResources(unittest.TestCase):

    def setUp(self):
        class_name = self.__class__.__name__
        self.tempFile = tempfile.NamedTemporaryFile(delete=False)
        self.tempFile.write(b'echo {\\"name\\": \\"gpu\\", \\"addresses\\": [\\"0\\"]}')
        self.tempFile.close()
        # create temporary directory for Worker resources coordination
        self.tempdir = tempfile.NamedTemporaryFile(delete=False)
        os.unlink(self.tempdir.name)
        os.chmod(self.tempFile.name, stat.S_IRWXU | stat.S_IXGRP | stat.S_IRGRP |
                 stat.S_IROTH | stat.S_IXOTH)
        conf = SparkConf().set("spark.test.home", SPARK_HOME)
        conf = conf.set("spark.driver.resource.gpu.amount", "1")
        conf = conf.set("spark.driver.resource.gpu.discoveryScript", self.tempFile.name)
        self.sc = SparkContext('local-cluster[2,1,1024]', class_name, conf=conf)

    def test_resources(self):
        """Test the resources are available."""
        resources = self.sc.resources
        self.assertEqual(len(resources), 1)
        self.assertTrue('gpu' in resources)
        self.assertEqual(resources['gpu'].name, 'gpu')
        self.assertEqual(resources['gpu'].addresses, ['0'])

    def tearDown(self):
        os.unlink(self.tempFile.name)
        self.sc.stop()


if __name__ == "__main__":
    from pyspark.tests.test_context import *  # noqa: F401

    try:
        import xmlrunner  # type: ignore[import]
        testRunner = xmlrunner.XMLTestRunner(output='target/test-reports', verbosity=2)
    except ImportError:
        testRunner = None
    unittest.main(testRunner=testRunner, verbosity=2)
