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import pandas as pd
import pytest

from superset.exceptions import InvalidPostProcessingError
from superset.utils import pandas_postprocessing as pp
from superset.utils.pandas_postprocessing.utils import FLAT_COLUMN_SEPARATOR
from tests.unit_tests.fixtures.dataframes import (
    multiple_metrics_df,
    single_metric_df,
    timeseries_df,
    timeseries_with_gap_df,
)
from tests.unit_tests.pandas_postprocessing.utils import series_to_list


def test_cum_should_not_side_effect():
    _timeseries_df = timeseries_df.copy()
    pp.cum(
        df=timeseries_df,
        columns={"y": "y2"},
        operator="sum",
    )
    assert _timeseries_df.equals(timeseries_df)


def test_cum():
    # create new column (cumsum)
    post_df = pp.cum(
        df=timeseries_df,
        columns={"y": "y2"},
        operator="sum",
    )
    assert post_df.columns.tolist() == ["label", "y", "y2"]
    assert series_to_list(post_df["label"]) == ["x", "y", "z", "q"]
    assert series_to_list(post_df["y"]) == [1.0, 2.0, 3.0, 4.0]
    assert series_to_list(post_df["y2"]) == [1.0, 3.0, 6.0, 10.0]

    # overwrite column (cumprod)
    post_df = pp.cum(
        df=timeseries_df,
        columns={"y": "y"},
        operator="prod",
    )
    assert post_df.columns.tolist() == ["label", "y"]
    assert series_to_list(post_df["y"]) == [1.0, 2.0, 6.0, 24.0]

    # overwrite column (cummin)
    post_df = pp.cum(
        df=timeseries_df,
        columns={"y": "y"},
        operator="min",
    )
    assert post_df.columns.tolist() == ["label", "y"]
    assert series_to_list(post_df["y"]) == [1.0, 1.0, 1.0, 1.0]

    # invalid operator
    with pytest.raises(InvalidPostProcessingError):
        pp.cum(
            df=timeseries_df,
            columns={"y": "y"},
            operator="abc",
        )


def test_cum_with_gap():
    # create new column (cumsum)
    post_df = pp.cum(
        df=timeseries_with_gap_df,
        columns={"y": "y2"},
        operator="sum",
    )
    assert post_df.columns.tolist() == ["label", "y", "y2"]
    assert series_to_list(post_df["label"]) == ["x", "y", "z", "q"]
    assert series_to_list(post_df["y"]) == [1.0, 2.0, None, 4.0]
    assert series_to_list(post_df["y2"]) == [1.0, 3.0, 3.0, 7.0]


def test_cum_after_pivot_with_single_metric():
    pivot_df = pp.pivot(
        df=single_metric_df,
        index=["dttm"],
        columns=["country"],
        aggregates={"sum_metric": {"operator": "sum"}},
    )
    """
               sum_metric
    country            UK US
    dttm
    2019-01-01          5  6
    2019-01-02          7  8
    """
    cum_df = pp.cum(df=pivot_df, operator="sum", columns={"sum_metric": "sum_metric"})
    """
               sum_metric
    country            UK  US
    dttm
    2019-01-01          5   6
    2019-01-02         12  14
    """
    cum_and_flat_df = pp.flatten(cum_df)
    """
                dttm  sum_metric, UK  sum_metric, US
    0 2019-01-01               5               6
    1 2019-01-02              12              14
    """
    assert cum_and_flat_df.equals(
        pd.DataFrame(
            {
                "dttm": pd.to_datetime(["2019-01-01", "2019-01-02"]),
                FLAT_COLUMN_SEPARATOR.join(["sum_metric", "UK"]): [5, 12],
                FLAT_COLUMN_SEPARATOR.join(["sum_metric", "US"]): [6, 14],
            }
        )
    )


def test_cum_after_pivot_with_multiple_metrics():
    pivot_df = pp.pivot(
        df=multiple_metrics_df,
        index=["dttm"],
        columns=["country"],
        aggregates={
            "sum_metric": {"operator": "sum"},
            "count_metric": {"operator": "sum"},
        },
    )
    """
                   count_metric    sum_metric
    country              UK US         UK US
    dttm
    2019-01-01            1  2          5  6
    2019-01-02            3  4          7  8
    """
    cum_df = pp.cum(
        df=pivot_df,
        operator="sum",
        columns={"sum_metric": "sum_metric", "count_metric": "count_metric"},
    )
    """
               count_metric    sum_metric
    country              UK US         UK  US
    dttm
    2019-01-01            1  2          5   6
    2019-01-02            4  6         12  14
    """
    flat_df = pp.flatten(cum_df)
    """
            dttm  count_metric, UK  count_metric, US  sum_metric, UK  sum_metric, US
    0 2019-01-01                 1                 2               5               6
    1 2019-01-02                 4                 6              12              14
    """
    assert flat_df.equals(
        pd.DataFrame(
            {
                "dttm": pd.to_datetime(["2019-01-01", "2019-01-02"]),
                FLAT_COLUMN_SEPARATOR.join(["count_metric", "UK"]): [1, 4],
                FLAT_COLUMN_SEPARATOR.join(["count_metric", "US"]): [2, 6],
                FLAT_COLUMN_SEPARATOR.join(["sum_metric", "UK"]): [5, 12],
                FLAT_COLUMN_SEPARATOR.join(["sum_metric", "US"]): [6, 14],
            }
        )
    )