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import unittest
from unittest.mock import patch

import pytest

from airflow.providers.google.cloud.transfers.presto_to_gcs import PrestoToGCSOperator

TASK_ID = "test-presto-to-gcs"
PRESTO_CONN_ID = "my-presto-conn"
GCP_CONN_ID = "my-gcp-conn"
IMPERSONATION_CHAIN = ["ACCOUNT_1", "ACCOUNT_2", "ACCOUNT_3"]
SQL = "SELECT * FROM memory.default.test_multiple_types"
BUCKET = "gs://test"
FILENAME = "test_{}.ndjson"

NDJSON_LINES = [
    b'{"some_num": 42, "some_str": "mock_row_content_1"}\n',
    b'{"some_num": 43, "some_str": "mock_row_content_2"}\n',
    b'{"some_num": 44, "some_str": "mock_row_content_3"}\n',
]
CSV_LINES = [
    b"some_num,some_str\r\n",
    b"42,mock_row_content_1\r\n",
    b"43,mock_row_content_2\r\n",
    b"44,mock_row_content_3\r\n",
]
SCHEMA_FILENAME = "schema_test.json"
SCHEMA_JSON = b'[{"name": "some_num", "type": "INT64"}, {"name": "some_str", "type": "STRING"}]'


@pytest.mark.integration("presto")
class TestPrestoToGCSOperator(unittest.TestCase):
    def test_init(self):
        """Test PrestoToGCSOperator instance is properly initialized."""
        op = PrestoToGCSOperator(
            task_id=TASK_ID,
            sql=SQL,
            bucket=BUCKET,
            filename=FILENAME,
            impersonation_chain=IMPERSONATION_CHAIN,
        )
        assert op.task_id == TASK_ID
        assert op.sql == SQL
        assert op.bucket == BUCKET
        assert op.filename == FILENAME
        assert op.impersonation_chain == IMPERSONATION_CHAIN

    @patch("airflow.providers.google.cloud.transfers.presto_to_gcs.PrestoHook")
    @patch("airflow.providers.google.cloud.transfers.sql_to_gcs.GCSHook")
    def test_save_as_json(self, mock_gcs_hook, mock_presto_hook):
        def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):
            assert BUCKET == bucket
            assert FILENAME.format(0) == obj
            assert "application/json" == mime_type
            assert not gzip
            with open(tmp_filename, "rb") as file:
                assert b"".join(NDJSON_LINES) == file.read()

        mock_gcs_hook.return_value.upload.side_effect = _assert_upload

        mock_cursor = mock_presto_hook.return_value.get_conn.return_value.cursor

        mock_cursor.return_value.description = [
            ("some_num", "INTEGER", None, None, None, None, None),
            ("some_str", "VARCHAR", None, None, None, None, None),
        ]

        mock_cursor.return_value.fetchone.side_effect = [
            [42, "mock_row_content_1"],
            [43, "mock_row_content_2"],
            [44, "mock_row_content_3"],
            None,
        ]

        op = PrestoToGCSOperator(
            task_id=TASK_ID,
            sql=SQL,
            bucket=BUCKET,
            filename=FILENAME,
            presto_conn_id=PRESTO_CONN_ID,
            gcp_conn_id=GCP_CONN_ID,
            impersonation_chain=IMPERSONATION_CHAIN,
        )

        op.execute(None)

        mock_presto_hook.assert_called_once_with(presto_conn_id=PRESTO_CONN_ID)
        mock_gcs_hook.assert_called_once_with(
            delegate_to=None,
            gcp_conn_id=GCP_CONN_ID,
            impersonation_chain=IMPERSONATION_CHAIN,
        )

        mock_gcs_hook.return_value.upload.assert_called()

    @patch("airflow.providers.google.cloud.transfers.presto_to_gcs.PrestoHook")
    @patch("airflow.providers.google.cloud.transfers.sql_to_gcs.GCSHook")
    def test_save_as_json_with_file_splitting(self, mock_gcs_hook, mock_presto_hook):
        """Test that ndjson is split by approx_max_file_size_bytes param."""

        expected_upload = {
            FILENAME.format(0): b"".join(NDJSON_LINES[:2]),
            FILENAME.format(1): NDJSON_LINES[2],
        }

        def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):
            assert BUCKET == bucket
            assert "application/json" == mime_type
            assert not gzip
            with open(tmp_filename, "rb") as file:
                assert expected_upload[obj] == file.read()

        mock_gcs_hook.return_value.upload.side_effect = _assert_upload

        mock_cursor = mock_presto_hook.return_value.get_conn.return_value.cursor

        mock_cursor.return_value.description = [
            ("some_num", "INTEGER", None, None, None, None, None),
            ("some_str", "VARCHAR(20)", None, None, None, None, None),
        ]

        mock_cursor.return_value.fetchone.side_effect = [
            [42, "mock_row_content_1"],
            [43, "mock_row_content_2"],
            [44, "mock_row_content_3"],
            None,
        ]

        op = PrestoToGCSOperator(
            task_id=TASK_ID,
            sql=SQL,
            bucket=BUCKET,
            filename=FILENAME,
            approx_max_file_size_bytes=len(expected_upload[FILENAME.format(0)]),
        )

        op.execute(None)

        mock_gcs_hook.return_value.upload.assert_called()

    @patch("airflow.providers.google.cloud.transfers.presto_to_gcs.PrestoHook")
    @patch("airflow.providers.google.cloud.transfers.sql_to_gcs.GCSHook")
    def test_save_as_json_with_schema_file(self, mock_gcs_hook, mock_presto_hook):
        """Test writing schema files."""

        def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):  # pylint: disable=unused-argument
            if obj == SCHEMA_FILENAME:
                with open(tmp_filename, "rb") as file:
                    assert SCHEMA_JSON == file.read()

        mock_gcs_hook.return_value.upload.side_effect = _assert_upload

        mock_cursor = mock_presto_hook.return_value.get_conn.return_value.cursor

        mock_cursor.return_value.description = [
            ("some_num", "INTEGER", None, None, None, None, None),
            ("some_str", "VARCHAR", None, None, None, None, None),
        ]

        mock_cursor.return_value.fetchone.side_effect = [
            [42, "mock_row_content_1"],
            [43, "mock_row_content_2"],
            [44, "mock_row_content_3"],
            None,
        ]

        op = PrestoToGCSOperator(
            task_id=TASK_ID,
            sql=SQL,
            bucket=BUCKET,
            filename=FILENAME,
            schema_filename=SCHEMA_FILENAME,
            export_format="csv",
            presto_conn_id=PRESTO_CONN_ID,
            gcp_conn_id=GCP_CONN_ID,
        )
        op.execute(None)

        # once for the file and once for the schema
        assert 2 == mock_gcs_hook.return_value.upload.call_count

    @patch("airflow.providers.google.cloud.transfers.sql_to_gcs.GCSHook")
    @patch("airflow.providers.google.cloud.transfers.presto_to_gcs.PrestoHook")
    def test_save_as_csv(self, mock_presto_hook, mock_gcs_hook):
        def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):
            assert BUCKET == bucket
            assert FILENAME.format(0) == obj
            assert "text/csv" == mime_type
            assert not gzip
            with open(tmp_filename, "rb") as file:
                assert b"".join(CSV_LINES) == file.read()

        mock_gcs_hook.return_value.upload.side_effect = _assert_upload

        mock_cursor = mock_presto_hook.return_value.get_conn.return_value.cursor

        mock_cursor.return_value.description = [
            ("some_num", "INTEGER", None, None, None, None, None),
            ("some_str", "VARCHAR", None, None, None, None, None),
        ]

        mock_cursor.return_value.fetchone.side_effect = [
            [42, "mock_row_content_1"],
            [43, "mock_row_content_2"],
            [44, "mock_row_content_3"],
            None,
        ]

        op = PrestoToGCSOperator(
            task_id=TASK_ID,
            sql=SQL,
            bucket=BUCKET,
            filename=FILENAME,
            export_format="csv",
            presto_conn_id=PRESTO_CONN_ID,