#
# 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
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# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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import time
from pyspark.sql.dataframe import DataFrame
from pyspark.testing.sqlutils import ReusedSQLTestCase


def my_test_function_1():
    return 1


class StreamingTestsForeachBatchMixin:
    def test_streaming_foreach_batch(self):
        q = None

        def collectBatch(batch_df, batch_id):
            batch_df.write.format("parquet").saveAsTable("test_table")

        try:
            df = self.spark.readStream.format("text").load("python/test_support/sql/streaming")
            q = df.writeStream.foreachBatch(collectBatch).start()
            q.processAllAvailable()
            collected = self.spark.sql("select * from test_table").collect()
            self.assertTrue(len(collected), 2)
        finally:
            if q:
                q.stop()
            self.spark.sql("DROP TABLE IF EXISTS test_table")

    def test_streaming_foreach_batch_tempview(self):
        q = None

        def collectBatch(batch_df, batch_id):
            batch_df.createOrReplaceTempView("updates")
            # it should use the spark session within given DataFrame, as microbatch execution will
            # clone the session which is no longer same with the session used to start the
            # streaming query
            assert len(batch_df.sparkSession.sql("SELECT * FROM updates").collect()) == 2
            # Write a table to verify on the repl/client side.
            batch_df.write.format("parquet").saveAsTable("test_table")

        try:
            df = self.spark.readStream.format("text").load("python/test_support/sql/streaming")
            q = df.writeStream.foreachBatch(collectBatch).start()
            q.processAllAvailable()
            collected = self.spark.sql("SELECT * FROM test_table").collect()
            self.assertTrue(len(collected[0]), 2)
        finally:
            if q:
                q.stop()
            self.spark.sql("DROP TABLE IF EXISTS test_table")

    def test_streaming_foreach_batch_propagates_python_errors(self):
        from pyspark.errors import StreamingQueryException

        q = None

        def collectBatch(df, id):
            raise RuntimeError("this should fail the query")

        try:
            df = self.spark.readStream.format("text").load("python/test_support/sql/streaming")
            q = df.writeStream.foreachBatch(collectBatch).start()
            q.processAllAvailable()
            self.fail("Expected a failure")
        except StreamingQueryException as e:
            err_msg = str(e)
            self.assertTrue("this should fail" in err_msg)
            # check for foreachBatch error class
            self.assertTrue("FOREACH_BATCH_USER_FUNCTION_ERROR" in err_msg)
        finally:
            if q:
                q.stop()

    def test_streaming_foreach_batch_graceful_stop(self):
        # SPARK-39218: Make foreachBatch streaming query stop gracefully
        def func(batch_df, _):
            batch_df.sparkSession._jvm.java.lang.Thread.sleep(10000)

        q = self.spark.readStream.format("rate").load().writeStream.foreachBatch(func).start()
        time.sleep(3)  # 'rowsPerSecond' defaults to 1. Waits 3 secs out for the input.
        q.stop()
        self.assertIsNone(q.exception(), "No exception has to be propagated.")

    def test_streaming_foreach_batch_spark_session(self):
        table_name = "testTable_foreach_batch"
        with self.table(table_name):

            def func(df: DataFrame, batch_id: int):
                if batch_id > 0:  # only process once
                    return
                spark = df.sparkSession
                df1 = spark.createDataFrame([("structured",), ("streaming",)])
                df1.union(df).write.mode("append").saveAsTable(table_name)

            df = self.spark.readStream.format("text").load("python/test_support/sql/streaming")
            q = df.writeStream.foreachBatch(func).start()
            q.processAllAvailable()
            q.stop()

            actual = self.spark.read.table(table_name)
            df = (
                self.spark.read.format("text")
                .load(path="python/test_support/sql/streaming/")
                .union(self.spark.createDataFrame([("structured",), ("streaming",)]))
            )
            self.assertEqual(sorted(df.collect()), sorted(actual.collect()))

    def test_streaming_foreach_batch_path_access(self):
        table_name = "testTable_foreach_batch_path"
        with self.table(table_name):

            def func(df: DataFrame, batch_id: int):
                if batch_id > 0:  # only process once
                    return
                spark = df.sparkSession
                df1 = spark.read.format("text").load("python/test_support/sql/streaming")
                df1.union(df).write.mode("append").saveAsTable(table_name)

            df = self.spark.readStream.format("text").load("python/test_support/sql/streaming")
            q = df.writeStream.foreachBatch(func).start()
            q.processAllAvailable()
            q.stop()

            actual = self.spark.read.table(table_name)
            df = self.spark.read.format("text").load(path="python/test_support/sql/streaming/")
            df = df.union(df)
            self.assertEqual(sorted(df.collect()), sorted(actual.collect()))

    @staticmethod
    def my_test_function_2():
        return 2

    def test_streaming_foreach_batch_fuction_calling(self):
        def my_test_function_3():
            return 3

        table_name = "testTable_foreach_batch_function"
        with self.table(table_name):

            def func(df: DataFrame, batch_id: int):
                if batch_id > 0:  # only process once
                    return
                spark = df.sparkSession
                df1 = spark.createDataFrame(
                    [
                        (my_test_function_1(),),
                        (StreamingTestsForeachBatchMixin.my_test_function_2(),),
                        (my_test_function_3(),),
                    ]
                )
                df1.write.mode("append").saveAsTable(table_name)

            df = self.spark.readStream.format("rate").load()
            q = df.writeStream.foreachBatch(func).start()
            q.processAllAvailable()
            q.stop()

            actual = self.spark.read.table(table_name)
            df = self.spark.createDataFrame(
                [
                    (my_test_function_1(),),
                    (StreamingTestsForeachBatchMixin.my_test_function_2(),),
                    (my_test_function_3(),),
                ]
            )
            self.assertEqual(sorted(df.collect()), sorted(actual.collect()))

    def test_streaming_foreach_batch_import(self):
        import time  # not imported in foreach_batch_worker

        table_name = "testTable_foreach_batch_import"
        with self.table(table_name):

            def func(df: DataFrame, batch_id: int):
                if batch_id > 0:  # only process once
                    return
                time.sleep(1)
                spark = df.sparkSession
                df1 = spark.read.format("text").load("python/test_support/sql/streaming")
                df1.write.mode("append").saveAsTable(table_name)

            df = self.spark.readStream.format("rate").load()
            q = df.writeStream.foreachBatch(func).start()
            q.processAllAvailable()
            q.stop()

            actual = self.spark.read.table(table_name)
            df = self.spark.read.format("text").load("python/test_support/sql/streaming")
            self.assertEqual(sorted(df.collect()), sorted(actual.collect()))


class StreamingTestsForeachBatch(StreamingTestsForeachBatchMixin, ReusedSQLTestCase):
    pass


if __name__ == "__main__":
    import unittest
    from pyspark.sql.tests.streaming.test_streaming_foreach_batch import *  # noqa: F401

    try:
        import xmlrunner

        testRunner = xmlrunner.XMLTestRunner(output="target/test-reports", verbosity=2)
    except ImportError:
        testRunner = None
    unittest.main(testRunner=testRunner, verbosity=2)
