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# 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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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from pandas import DataFrame, Series, Timestamp
from pandas.testing import assert_frame_equal
from pytest import fixture, mark

from superset.common.chart_data import ChartDataResultFormat, ChartDataResultType
from superset.common.query_context import QueryContext
from superset.common.query_context_processor import QueryContextProcessor
from superset.connectors.sqla.models import BaseDatasource
from superset.constants import TimeGrain

query_context_processor = QueryContextProcessor(
    QueryContext(
        datasource=BaseDatasource(),
        queries=[],
        result_type=ChartDataResultType.COLUMNS,
        form_data={},
        slice_=None,
        result_format=ChartDataResultFormat.CSV,
        cache_values={},
    )
)


@fixture
def make_join_column_producer():
    def join_column_producer(row: Series, column_index: int) -> str:
        return "CUSTOM_FORMAT"

    return join_column_producer


@mark.parametrize(
    ("time_grain", "expected"),
    [
        (TimeGrain.WEEK, "2020-W01"),
        (TimeGrain.MONTH, "2020-01"),
        (TimeGrain.QUARTER, "2020-Q1"),
        (TimeGrain.YEAR, "2020"),
    ],
)
def test_join_column(time_grain: str, expected: str):
    df = DataFrame({"ds": [Timestamp("2020-01-07")]})
    column_name = "join_column"
    query_context_processor.add_offset_join_column(df, column_name, time_grain)
    result = DataFrame({"ds": [Timestamp("2020-01-07")], column_name: [expected]})
    assert_frame_equal(df, result)


def test_join_column_producer(make_join_column_producer):
    df = DataFrame({"ds": [Timestamp("2020-01-07")]})
    column_name = "join_column"
    query_context_processor.add_offset_join_column(
        df, column_name, TimeGrain.YEAR, None, make_join_column_producer
    )
    result = DataFrame(
        {"ds": [Timestamp("2020-01-07")], column_name: ["CUSTOM_FORMAT"]}
    )
    assert_frame_equal(df, result)


def test_join_offset_dfs_no_offsets():
    df = DataFrame({"A": ["2021-01-01", "2021-02-01", "2021-03-01"]})
    offset_dfs = {}
    time_grain = "YEAR"
    join_keys = ["A"]

    result = query_context_processor.join_offset_dfs(
        df, offset_dfs, time_grain, join_keys
    )

    assert_frame_equal(df, result)


def test_join_offset_dfs_with_offsets():
    df = DataFrame({"A": ["2021-01-01", "2021-02-01", "2021-03-01"]})
    offset_df = DataFrame(
        {"A": ["2021-02-01", "2021-03-01", "2021-04-01"], "B": [5, 6, 7]}
    )
    offset_dfs = {"1_YEAR": offset_df}
    time_grain = "YEAR"
    join_keys = ["A"]

    expected = DataFrame(
        {"A": ["2021-01-01", "2021-02-01", "2021-03-01"], "B": [None, 5, 6]}
    )

    result = query_context_processor.join_offset_dfs(
        df, offset_dfs, time_grain, join_keys
    )

    assert_frame_equal(expected, result)


def test_join_offset_dfs_with_multiple_offsets():
    df = DataFrame({"A": ["2021-01-01", "2021-02-01", "2021-03-01"]})
    offset_df1 = DataFrame(
        {"A": ["2021-02-01", "2021-03-01", "2021-04-01"], "B": [5, 6, 7]}
    )
    offset_df2 = DataFrame(
        {"A": ["2021-03-01", "2021-04-01", "2021-05-01"], "C": [8, 9, 10]}
    )
    offset_dfs = {"1_YEAR": offset_df1, "2_YEAR": offset_df2}
    time_grain = "YEAR"
    join_keys = ["A"]

    expected = DataFrame(
        {
            "A": ["2021-01-01", "2021-02-01", "2021-03-01"],
            "B": [None, 5, 6],
            "C": [None, None, 8],
        }
    )

    result = query_context_processor.join_offset_dfs(
        df, offset_dfs, time_grain, join_keys
    )

    assert_frame_equal(expected, result)


def test_join_offset_dfs_with_month_granularity():
    df = DataFrame(
        {
            "A": [
                "2021-01-01",
                "2021-01-15",
                "2021-02-01",
                "2021-02-15",
                "2021-03-01",
                "2021-03-15",
            ],
            "D": [1, 2, 3, 4, 5, 6],
        }
    )
    offset_df = DataFrame(
        {
            "A": [
                "2021-02-01",
                "2021-02-15",
                "2021-03-01",
                "2021-03-15",
                "2021-04-01",
                "2021-04-15",
            ],
            "B": [5, 6, 7, 8, 9, 10],
        }
    )
    offset_dfs = {"1_MONTH": offset_df}
    time_grain = "MONTH"
    join_keys = ["A"]

    expected = DataFrame(
        {
            "A": [
                "2021-01-01",
                "2021-01-15",
                "2021-02-01",
                "2021-02-15",
                "2021-03-01",
                "2021-03-15",
            ],
            "D": [1, 2, 3, 4, 5, 6],
            "B": [None, None, 5, 6, 7, 8],
        }
    )

    result = query_context_processor.join_offset_dfs(
        df, offset_dfs, time_grain, join_keys
    )

    assert_frame_equal(expected, result)