python/tests/test_dataframe.py

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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# software distributed under the License is distributed on an
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
import os
import re
from typing import Any

import pyarrow as pa
import pyarrow.parquet as pq
import pytest
from datafusion import (
    DataFrame,
    SessionContext,
    WindowFrame,
    column,
    literal,
)
from datafusion import (
    functions as f,
)
from datafusion.expr import Window
from datafusion.html_formatter import (
    DataFrameHtmlFormatter,
    configure_formatter,
    get_formatter,
    reset_formatter,
    reset_styles_loaded_state,
)
from pyarrow.csv import write_csv


@pytest.fixture
def ctx():
    return SessionContext()


@pytest.fixture
def df():
    ctx = SessionContext()

    # create a RecordBatch and a new DataFrame from it
    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6]), pa.array([8, 5, 8])],
        names=["a", "b", "c"],
    )

    return ctx.from_arrow(batch)


@pytest.fixture
def struct_df():
    ctx = SessionContext()

    # create a RecordBatch and a new DataFrame from it
    batch = pa.RecordBatch.from_arrays(
        [pa.array([{"c": 1}, {"c": 2}, {"c": 3}]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )

    return ctx.create_dataframe([[batch]])


@pytest.fixture
def nested_df():
    ctx = SessionContext()

    # create a RecordBatch and a new DataFrame from it
    # Intentionally make each array of different length
    batch = pa.RecordBatch.from_arrays(
        [pa.array([[1], [2, 3], [4, 5, 6], None]), pa.array([7, 8, 9, 10])],
        names=["a", "b"],
    )

    return ctx.create_dataframe([[batch]])


@pytest.fixture
def aggregate_df():
    ctx = SessionContext()
    ctx.register_csv("test", "testing/data/csv/aggregate_test_100.csv")
    return ctx.sql("select c1, sum(c2) from test group by c1")


@pytest.fixture
def partitioned_df():
    ctx = SessionContext()

    # create a RecordBatch and a new DataFrame from it
    batch = pa.RecordBatch.from_arrays(
        [
            pa.array([0, 1, 2, 3, 4, 5, 6]),
            pa.array([7, None, 7, 8, 9, None, 9]),
            pa.array(["A", "A", "A", "A", "B", "B", "B"]),
        ],
        names=["a", "b", "c"],
    )

    return ctx.create_dataframe([[batch]])


@pytest.fixture
def clean_formatter_state():
    """Reset the HTML formatter after each test."""
    reset_formatter()


def test_select(df):
    df_1 = df.select(
        column("a") + column("b"),
        column("a") - column("b"),
    )

    # execute and collect the first (and only) batch
    result = df_1.collect()[0]

    assert result.column(0) == pa.array([5, 7, 9])
    assert result.column(1) == pa.array([-3, -3, -3])

    df_2 = df.select("b", "a")

    # execute and collect the first (and only) batch
    result = df_2.collect()[0]

    assert result.column(0) == pa.array([4, 5, 6])
    assert result.column(1) == pa.array([1, 2, 3])


def test_select_mixed_expr_string(df):
    df = df.select(column("b"), "a")

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.column(0) == pa.array([4, 5, 6])
    assert result.column(1) == pa.array([1, 2, 3])


def test_filter(df):
    df1 = df.filter(column("a") > literal(2)).select(
        column("a") + column("b"),
        column("a") - column("b"),
    )

    # execute and collect the first (and only) batch
    result = df1.collect()[0]

    assert result.column(0) == pa.array([9])
    assert result.column(1) == pa.array([-3])

    df.show()
    # verify that if there is no filter applied, internal dataframe is unchanged
    df2 = df.filter()
    assert df.df == df2.df

    df3 = df.filter(column("a") > literal(1), column("b") != literal(6))
    result = df3.collect()[0]

    assert result.column(0) == pa.array([2])
    assert result.column(1) == pa.array([5])
    assert result.column(2) == pa.array([5])


def test_sort(df):
    df = df.sort(column("b").sort(ascending=False))

    table = pa.Table.from_batches(df.collect())
    expected = {"a": [3, 2, 1], "b": [6, 5, 4], "c": [8, 5, 8]}

    assert table.to_pydict() == expected


def test_drop(df):
    df = df.drop("c")

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert df.schema().names == ["a", "b"]
    assert result.column(0) == pa.array([1, 2, 3])
    assert result.column(1) == pa.array([4, 5, 6])


def test_limit(df):
    df = df.limit(1)

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert len(result.column(0)) == 1
    assert len(result.column(1)) == 1


def test_limit_with_offset(df):
    # only 3 rows, but limit past the end to ensure that offset is working
    df = df.limit(5, offset=2)

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert len(result.column(0)) == 1
    assert len(result.column(1)) == 1


def test_head(df):
    df = df.head(1)

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.column(0) == pa.array([1])
    assert result.column(1) == pa.array([4])
    assert result.column(2) == pa.array([8])


def test_tail(df):
    df = df.tail(1)

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.column(0) == pa.array([3])
    assert result.column(1) == pa.array([6])
    assert result.column(2) == pa.array([8])


def test_with_column(df):
    df = df.with_column("c", column("a") + column("b"))

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.schema.field(0).name == "a"
    assert result.schema.field(1).name == "b"
    assert result.schema.field(2).name == "c"

    assert result.column(0) == pa.array([1, 2, 3])
    assert result.column(1) == pa.array([4, 5, 6])
    assert result.column(2) == pa.array([5, 7, 9])


def test_with_columns(df):
    df = df.with_columns(
        (column("a") + column("b")).alias("c"),
        (column("a") + column("b")).alias("d"),
        [
            (column("a") + column("b")).alias("e"),
            (column("a") + column("b")).alias("f"),
        ],
        g=(column("a") + column("b")),
    )

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.schema.field(0).name == "a"
    assert result.schema.field(1).name == "b"
    assert result.schema.field(2).name == "c"
    assert result.schema.field(3).name == "d"
    assert result.schema.field(4).name == "e"
    assert result.schema.field(5).name == "f"
    assert result.schema.field(6).name == "g"

    assert result.column(0) == pa.array([1, 2, 3])
    assert result.column(1) == pa.array([4, 5, 6])
    assert result.column(2) == pa.array([5, 7, 9])
    assert result.column(3) == pa.array([5, 7, 9])
    assert result.column(4) == pa.array([5, 7, 9])
    assert result.column(5) == pa.array([5, 7, 9])
    assert result.column(6) == pa.array([5, 7, 9])


def test_cast(df):
    df = df.cast({"a": pa.float16(), "b": pa.list_(pa.uint32())})
    expected = pa.schema(
        [("a", pa.float16()), ("b", pa.list_(pa.uint32())), ("c", pa.int64())]
    )

    assert df.schema() == expected


def test_with_column_renamed(df):
    df = df.with_column("c", column("a") + column("b")).with_column_renamed("c", "sum")

    result = df.collect()[0]

    assert result.schema.field(0).name == "a"
    assert result.schema.field(1).name == "b"
    assert result.schema.field(2).name == "sum"


def test_unnest(nested_df):
    nested_df = nested_df.unnest_columns("a")

    # execute and collect the first (and only) batch
    result = nested_df.collect()[0]

    assert result.column(0) == pa.array([1, 2, 3, 4, 5, 6, None])
    assert result.column(1) == pa.array([7, 8, 8, 9, 9, 9, 10])


def test_unnest_without_nulls(nested_df):
    nested_df = nested_df.unnest_columns("a", preserve_nulls=False)

    # execute and collect the first (and only) batch
    result = nested_df.collect()[0]

    assert result.column(0) == pa.array([1, 2, 3, 4, 5, 6])
    assert result.column(1) == pa.array([7, 8, 8, 9, 9, 9])


@pytest.mark.filterwarnings("ignore:`join_keys`:DeprecationWarning")
def test_join():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df = ctx.create_dataframe([[batch]], "l")

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2]), pa.array([8, 10])],
        names=["a", "c"],
    )
    df1 = ctx.create_dataframe([[batch]], "r")

    df2 = df.join(df1, on="a", how="inner")
    df2.show()
    df2 = df2.sort(column("l.a"))
    table = pa.Table.from_batches(df2.collect())

    expected = {"a": [1, 2], "c": [8, 10], "b": [4, 5]}
    assert table.to_pydict() == expected

    df2 = df.join(df1, left_on="a", right_on="a", how="inner")
    df2.show()
    df2 = df2.sort(column("l.a"))
    table = pa.Table.from_batches(df2.collect())

    expected = {"a": [1, 2], "c": [8, 10], "b": [4, 5]}
    assert table.to_pydict() == expected

    # Verify we don't make a breaking change to pre-43.0.0
    # where users would pass join_keys as a positional argument
    df2 = df.join(df1, (["a"], ["a"]), how="inner")
    df2.show()
    df2 = df2.sort(column("l.a"))
    table = pa.Table.from_batches(df2.collect())

    expected = {"a": [1, 2], "c": [8, 10], "b": [4, 5]}
    assert table.to_pydict() == expected


def test_join_invalid_params():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df = ctx.create_dataframe([[batch]], "l")

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2]), pa.array([8, 10])],
        names=["a", "c"],
    )
    df1 = ctx.create_dataframe([[batch]], "r")

    with pytest.deprecated_call():
        df2 = df.join(df1, join_keys=(["a"], ["a"]), how="inner")
        df2.show()
        df2 = df2.sort(column("l.a"))
        table = pa.Table.from_batches(df2.collect())

        expected = {"a": [1, 2], "c": [8, 10], "b": [4, 5]}
        assert table.to_pydict() == expected

    with pytest.raises(
        ValueError, match=r"`left_on` or `right_on` should not provided with `on`"
    ):
        df2 = df.join(df1, on="a", how="inner", right_on="test")

    with pytest.raises(
        ValueError, match=r"`left_on` and `right_on` should both be provided."
    ):
        df2 = df.join(df1, left_on="a", how="inner")

    with pytest.raises(
        ValueError, match=r"either `on` or `left_on` and `right_on` should be provided."
    ):
        df2 = df.join(df1, how="inner")


def test_join_on():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df = ctx.create_dataframe([[batch]], "l")

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2]), pa.array([-8, 10])],
        names=["a", "c"],
    )
    df1 = ctx.create_dataframe([[batch]], "r")

    df2 = df.join_on(df1, column("l.a").__eq__(column("r.a")), how="inner")
    df2.show()
    df2 = df2.sort(column("l.a"))
    table = pa.Table.from_batches(df2.collect())

    expected = {"a": [1, 2], "c": [-8, 10], "b": [4, 5]}
    assert table.to_pydict() == expected

    df3 = df.join_on(
        df1,
        column("l.a").__eq__(column("r.a")),
        column("l.a").__lt__(column("r.c")),
        how="inner",
    )
    df3.show()
    df3 = df3.sort(column("l.a"))
    table = pa.Table.from_batches(df3.collect())
    expected = {"a": [2], "c": [10], "b": [5]}
    assert table.to_pydict() == expected


def test_distinct():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3, 1, 2, 3]), pa.array([4, 5, 6, 4, 5, 6])],
        names=["a", "b"],
    )
    df_a = ctx.create_dataframe([[batch]]).distinct().sort(column("a"))

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df_b = ctx.create_dataframe([[batch]]).sort(column("a"))

    assert df_a.collect() == df_b.collect()


data_test_window_functions = [
    (
        "row",
        f.row_number(order_by=[column("b"), column("a").sort(ascending=False)]),
        [4, 2, 3, 5, 7, 1, 6],
    ),
    (
        "row_w_params",
        f.row_number(
            order_by=[column("b"), column("a")],
            partition_by=[column("c")],
        ),
        [2, 1, 3, 4, 2, 1, 3],
    ),
    ("rank", f.rank(order_by=[column("b")]), [3, 1, 3, 5, 6, 1, 6]),
    (
        "rank_w_params",
        f.rank(order_by=[column("b"), column("a")], partition_by=[column("c")]),
        [2, 1, 3, 4, 2, 1, 3],
    ),
    (
        "dense_rank",
        f.dense_rank(order_by=[column("b")]),
        [2, 1, 2, 3, 4, 1, 4],
    ),
    (
        "dense_rank_w_params",
        f.dense_rank(order_by=[column("b"), column("a")], partition_by=[column("c")]),
        [2, 1, 3, 4, 2, 1, 3],
    ),
    (
        "percent_rank",
        f.round(f.percent_rank(order_by=[column("b")]), literal(3)),
        [0.333, 0.0, 0.333, 0.667, 0.833, 0.0, 0.833],
    ),
    (
        "percent_rank_w_params",
        f.round(
            f.percent_rank(
                order_by=[column("b"), column("a")], partition_by=[column("c")]
            ),
            literal(3),
        ),
        [0.333, 0.0, 0.667, 1.0, 0.5, 0.0, 1.0],
    ),
    (
        "cume_dist",
        f.round(f.cume_dist(order_by=[column("b")]), literal(3)),
        [0.571, 0.286, 0.571, 0.714, 1.0, 0.286, 1.0],
    ),
    (
        "cume_dist_w_params",
        f.round(
            f.cume_dist(
                order_by=[column("b"), column("a")], partition_by=[column("c")]
            ),
            literal(3),
        ),
        [0.5, 0.25, 0.75, 1.0, 0.667, 0.333, 1.0],
    ),
    (
        "ntile",
        f.ntile(2, order_by=[column("b")]),
        [1, 1, 1, 2, 2, 1, 2],
    ),
    (
        "ntile_w_params",
        f.ntile(2, order_by=[column("b"), column("a")], partition_by=[column("c")]),
        [1, 1, 2, 2, 1, 1, 2],
    ),
    ("lead", f.lead(column("b"), order_by=[column("b")]), [7, None, 8, 9, 9, 7, None]),
    (
        "lead_w_params",
        f.lead(
            column("b"),
            shift_offset=2,
            default_value=-1,
            order_by=[column("b"), column("a")],
            partition_by=[column("c")],
        ),
        [8, 7, -1, -1, -1, 9, -1],
    ),
    ("lag", f.lag(column("b"), order_by=[column("b")]), [None, None, 7, 7, 8, None, 9]),
    (
        "lag_w_params",
        f.lag(
            column("b"),
            shift_offset=2,
            default_value=-1,
            order_by=[column("b"), column("a")],
            partition_by=[column("c")],
        ),
        [-1, -1, None, 7, -1, -1, None],
    ),
    (
        "first_value",
        f.first_value(column("a")).over(
            Window(partition_by=[column("c")], order_by=[column("b")])
        ),
        [1, 1, 1, 1, 5, 5, 5],
    ),
    (
        "last_value",
        f.last_value(column("a")).over(
            Window(
                partition_by=[column("c")],
                order_by=[column("b")],
                window_frame=WindowFrame("rows", None, None),
            )
        ),
        [3, 3, 3, 3, 6, 6, 6],
    ),
    (
        "3rd_value",
        f.nth_value(column("b"), 3).over(Window(order_by=[column("a")])),
        [None, None, 7, 7, 7, 7, 7],
    ),
    (
        "avg",
        f.round(f.avg(column("b")).over(Window(order_by=[column("a")])), literal(3)),
        [7.0, 7.0, 7.0, 7.333, 7.75, 7.75, 8.0],
    ),
]


@pytest.mark.parametrize(("name", "expr", "result"), data_test_window_functions)
def test_window_functions(partitioned_df, name, expr, result):
    df = partitioned_df.select(
        column("a"), column("b"), column("c"), f.alias(expr, name)
    )
    df.sort(column("a")).show()
    table = pa.Table.from_batches(df.collect())

    expected = {
        "a": [0, 1, 2, 3, 4, 5, 6],
        "b": [7, None, 7, 8, 9, None, 9],
        "c": ["A", "A", "A", "A", "B", "B", "B"],
        name: result,
    }

    assert table.sort_by("a").to_pydict() == expected


@pytest.mark.parametrize(
    ("units", "start_bound", "end_bound"),
    [
        (units, start_bound, end_bound)
        for units in ("rows", "range")
        for start_bound in (None, 0, 1)
        for end_bound in (None, 0, 1)
    ]
    + [
        ("groups", 0, 0),
    ],
)
def test_valid_window_frame(units, start_bound, end_bound):
    WindowFrame(units, start_bound, end_bound)


@pytest.mark.parametrize(
    ("units", "start_bound", "end_bound"),
    [
        ("invalid-units", 0, None),
        ("invalid-units", None, 0),
        ("invalid-units", None, None),
        ("groups", None, 0),
        ("groups", 0, None),
        ("groups", None, None),
    ],
)
def test_invalid_window_frame(units, start_bound, end_bound):
    with pytest.raises(RuntimeError):
        WindowFrame(units, start_bound, end_bound)


def test_window_frame_defaults_match_postgres(partitioned_df):
    # ref: https://github.com/apache/datafusion-python/issues/688

    window_frame = WindowFrame("rows", None, None)

    col_a = column("a")

    # Using `f.window` with or without an unbounded window_frame produces the same
    # results. These tests are included as a regression check but can be removed when
    # f.window() is deprecated in favor of using the .over() approach.
    no_frame = f.window("avg", [col_a]).alias("no_frame")
    with_frame = f.window("avg", [col_a], window_frame=window_frame).alias("with_frame")
    df_1 = partitioned_df.select(col_a, no_frame, with_frame)

    expected = {
        "a": [0, 1, 2, 3, 4, 5, 6],
        "no_frame": [3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0],
        "with_frame": [3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0],
    }

    assert df_1.sort(col_a).to_pydict() == expected

    # When order is not set, the default frame should be unounded preceeding to
    # unbounded following. When order is set, the default frame is unbounded preceeding
    # to current row.
    no_order = f.avg(col_a).over(Window()).alias("over_no_order")
    with_order = f.avg(col_a).over(Window(order_by=[col_a])).alias("over_with_order")
    df_2 = partitioned_df.select(col_a, no_order, with_order)

    expected = {
        "a": [0, 1, 2, 3, 4, 5, 6],
        "over_no_order": [3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0],
        "over_with_order": [0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0],
    }

    assert df_2.sort(col_a).to_pydict() == expected


def test_html_formatter_configuration(df, clean_formatter_state):
    """Test configuring the HTML formatter with different options."""
    # Configure with custom settings
    configure_formatter(
        max_cell_length=5,
        max_width=500,
        max_height=200,
        enable_cell_expansion=False,
    )

    html_output = df._repr_html_()

    # Verify our configuration was applied
    assert "max-height: 200px" in html_output
    assert "max-width: 500px" in html_output
    # With cell expansion disabled, we shouldn't see expandable-container elements
    assert "expandable-container" not in html_output


def test_html_formatter_custom_style_provider(df, clean_formatter_state):
    """Test using custom style providers with the HTML formatter."""

    class CustomStyleProvider:
        def get_cell_style(self) -> str:
            return (
                "background-color: #f5f5f5; color: #333; padding: 8px; border: "
                "1px solid #ddd;"
            )

        def get_header_style(self) -> str:
            return (
                "background-color: #4285f4; color: white; font-weight: bold; "
                "padding: 10px; border: 1px solid #3367d6;"
            )

    # Configure with custom style provider
    configure_formatter(style_provider=CustomStyleProvider())

    html_output = df._repr_html_()

    # Verify our custom styles were applied
    assert "background-color: #4285f4" in html_output
    assert "color: white" in html_output
    assert "background-color: #f5f5f5" in html_output


def test_html_formatter_type_formatters(df, clean_formatter_state):
    """Test registering custom type formatters for specific data types."""

    # Get current formatter and register custom formatters
    formatter = get_formatter()

    # Format integers with color based on value
    # Using int as the type for the formatter will work since we convert
    # Arrow scalar values to Python native types in _get_cell_value
    def format_int(value):
        return f'<span style="color: {"red" if value > 2 else "blue"}">{value}</span>'

    formatter.register_formatter(int, format_int)

    html_output = df._repr_html_()

    # Our test dataframe has values 1,2,3 so we should see:
    assert '<span style="color: blue">1</span>' in html_output


def test_html_formatter_custom_cell_builder(df, clean_formatter_state):
    """Test using a custom cell builder function."""

    # Create a custom cell builder with distinct styling for different value ranges
    def custom_cell_builder(value, row, col, table_id):
        try:
            num_value = int(value)
            if num_value > 5:  # Values > 5 get green background with indicator
                return (
                    '<td style="background-color: #d9f0d3" '
                    f'data-test="high">{value}-high</td>'
                )
            if num_value < 3:  # Values < 3 get blue background with indicator
                return (
                    '<td style="background-color: #d3e9f0" '
                    f'data-test="low">{value}-low</td>'
                )
        except (ValueError, TypeError):
            pass

        # Default styling for other cells (3, 4, 5)
        return f'<td style="border: 1px solid #ddd" data-test="mid">{value}-mid</td>'

    # Set our custom cell builder
    formatter = get_formatter()
    formatter.set_custom_cell_builder(custom_cell_builder)

    html_output = df._repr_html_()

    # Extract cells with specific styling using regex
    low_cells = re.findall(
        r'<td style="background-color: #d3e9f0"[^>]*>(\d+)-low</td>', html_output
    )
    mid_cells = re.findall(
        r'<td style="border: 1px solid #ddd"[^>]*>(\d+)-mid</td>', html_output
    )
    high_cells = re.findall(
        r'<td style="background-color: #d9f0d3"[^>]*>(\d+)-high</td>', html_output
    )

    # Sort the extracted values for consistent comparison
    low_cells = sorted(map(int, low_cells))
    mid_cells = sorted(map(int, mid_cells))
    high_cells = sorted(map(int, high_cells))

    # Verify specific values have the correct styling applied
    assert low_cells == [1, 2]  # Values < 3
    assert mid_cells == [3, 4, 5, 5]  # Values 3-5
    assert high_cells == [6, 8, 8]  # Values > 5

    # Verify the exact content with styling appears in the output
    assert (
        '<td style="background-color: #d3e9f0" data-test="low">1-low</td>'
        in html_output
    )
    assert (
        '<td style="background-color: #d3e9f0" data-test="low">2-low</td>'
        in html_output
    )
    assert (
        '<td style="border: 1px solid #ddd" data-test="mid">3-mid</td>' in html_output
    )
    assert (
        '<td style="border: 1px solid #ddd" data-test="mid">4-mid</td>' in html_output
    )
    assert (
        '<td style="background-color: #d9f0d3" data-test="high">6-high</td>'
        in html_output
    )
    assert (
        '<td style="background-color: #d9f0d3" data-test="high">8-high</td>'
        in html_output
    )

    # Count occurrences to ensure all cells are properly styled
    assert html_output.count("-low</td>") == 2  # Two low values (1, 2)
    assert html_output.count("-mid</td>") == 4  # Four mid values (3, 4, 5, 5)
    assert html_output.count("-high</td>") == 3  # Three high values (6, 8, 8)

    # Create a custom cell builder that changes background color based on value
    def custom_cell_builder(value, row, col, table_id):
        # Handle numeric values regardless of their exact type
        try:
            num_value = int(value)
            if num_value > 5:  # Values > 5 get green background
                return f'<td style="background-color: #d9f0d3">{value}</td>'
            if num_value < 3:  # Values < 3 get light blue background
                return f'<td style="background-color: #d3e9f0">{value}</td>'
        except (ValueError, TypeError):
            pass

        # Default styling for other cells
        return f'<td style="border: 1px solid #ddd">{value}</td>'

    # Set our custom cell builder
    formatter = get_formatter()
    formatter.set_custom_cell_builder(custom_cell_builder)

    html_output = df._repr_html_()

    # Verify our custom cell styling was applied
    assert "background-color: #d3e9f0" in html_output  # For values 1,2


def test_html_formatter_custom_header_builder(df, clean_formatter_state):
    """Test using a custom header builder function."""

    # Create a custom header builder with tooltips
    def custom_header_builder(field):
        tooltips = {
            "a": "Primary key column",
            "b": "Secondary values",
            "c": "Additional data",
        }
        tooltip = tooltips.get(field.name, "")
        return (
            f'<th style="background-color: #333; color: white" '
            f'title="{tooltip}">{field.name}</th>'
        )

    # Set our custom header builder
    formatter = get_formatter()
    formatter.set_custom_header_builder(custom_header_builder)

    html_output = df._repr_html_()

    # Verify our custom headers were applied
    assert 'title="Primary key column"' in html_output
    assert 'title="Secondary values"' in html_output
    assert "background-color: #333; color: white" in html_output


def test_html_formatter_complex_customization(df, clean_formatter_state):
    """Test combining multiple customization options together."""

    # Create a dark mode style provider
    class DarkModeStyleProvider:
        def get_cell_style(self) -> str:
            return (
                "background-color: #222; color: #eee; "
                "padding: 8px; border: 1px solid #444;"
            )

        def get_header_style(self) -> str:
            return (
                "background-color: #111; color: #fff; padding: 10px; "
                "border: 1px solid #333;"
            )

    # Configure with dark mode style
    configure_formatter(
        max_cell_length=10,
        style_provider=DarkModeStyleProvider(),
        custom_css="""
            .datafusion-table {
                font-family: monospace;
                border-collapse: collapse;
            }
            .datafusion-table tr:hover td {
                background-color: #444 !important;
            }
        """,
    )

    # Add type formatters for special formatting - now working with native int values
    formatter = get_formatter()
    formatter.register_formatter(
        int,
        lambda n: f'<span style="color: {"#5af" if n % 2 == 0 else "#f5a"}">{n}</span>',
    )

    html_output = df._repr_html_()

    # Verify our customizations were applied
    assert "background-color: #222" in html_output
    assert "background-color: #111" in html_output
    assert ".datafusion-table" in html_output
    assert "color: #5af" in html_output  # Even numbers


def test_get_dataframe(tmp_path):
    ctx = SessionContext()

    path = tmp_path / "test.csv"
    table = pa.Table.from_arrays(
        [
            [1, 2, 3, 4],
            ["a", "b", "c", "d"],
            [1.1, 2.2, 3.3, 4.4],
        ],
        names=["int", "str", "float"],
    )
    write_csv(table, path)

    ctx.register_csv("csv", path)

    df = ctx.table("csv")
    assert isinstance(df, DataFrame)


def test_struct_select(struct_df):
    df = struct_df.select(
        column("a")["c"] + column("b"),
        column("a")["c"] - column("b"),
    )

    # execute and collect the first (and only) batch
    result = df.collect()[0]

    assert result.column(0) == pa.array([5, 7, 9])
    assert result.column(1) == pa.array([-3, -3, -3])


def test_explain(df):
    df = df.select(
        column("a") + column("b"),
        column("a") - column("b"),
    )
    df.explain()


def test_logical_plan(aggregate_df):
    plan = aggregate_df.logical_plan()

    expected = "Projection: test.c1, sum(test.c2)"

    assert expected == plan.display()

    expected = (
        "Projection: test.c1, sum(test.c2)\n"
        "  Aggregate: groupBy=[[test.c1]], aggr=[[sum(test.c2)]]\n"
        "    TableScan: test"
    )

    assert expected == plan.display_indent()


def test_optimized_logical_plan(aggregate_df):
    plan = aggregate_df.optimized_logical_plan()

    expected = "Aggregate: groupBy=[[test.c1]], aggr=[[sum(test.c2)]]"

    assert expected == plan.display()

    expected = (
        "Aggregate: groupBy=[[test.c1]], aggr=[[sum(test.c2)]]\n"
        "  TableScan: test projection=[c1, c2]"
    )

    assert expected == plan.display_indent()


def test_execution_plan(aggregate_df):
    plan = aggregate_df.execution_plan()

    expected = (
        "AggregateExec: mode=FinalPartitioned, gby=[c1@0 as c1], aggr=[sum(test.c2)]\n"
    )

    assert expected == plan.display()

    # Check the number of partitions is as expected.
    assert isinstance(plan.partition_count, int)

    expected = (
        "ProjectionExec: expr=[c1@0 as c1, SUM(test.c2)@1 as SUM(test.c2)]\n"
        "  Aggregate: groupBy=[[test.c1]], aggr=[[SUM(test.c2)]]\n"
        "    TableScan: test projection=[c1, c2]"
    )

    indent = plan.display_indent()

    # indent plan will be different for everyone due to absolute path
    # to filename, so we just check for some expected content
    assert "AggregateExec:" in indent
    assert "CoalesceBatchesExec:" in indent
    assert "RepartitionExec:" in indent
    assert "DataSourceExec:" in indent
    assert "file_type=csv" in indent

    ctx = SessionContext()
    rows_returned = 0
    for idx in range(plan.partition_count):
        stream = ctx.execute(plan, idx)
        try:
            batch = stream.next()
            assert batch is not None
            rows_returned += len(batch.to_pyarrow()[0])
        except StopIteration:
            # This is one of the partitions with no values
            pass
        with pytest.raises(StopIteration):
            stream.next()

    assert rows_returned == 5


@pytest.mark.asyncio
async def test_async_iteration_of_df(aggregate_df):
    rows_returned = 0
    async for batch in aggregate_df.execute_stream():
        assert batch is not None
        rows_returned += len(batch.to_pyarrow()[0])

    assert rows_returned == 5


def test_repartition(df):
    df.repartition(2)


def test_repartition_by_hash(df):
    df.repartition_by_hash(column("a"), num=2)


def test_intersect():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df_a = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([3, 4, 5]), pa.array([6, 7, 8])],
        names=["a", "b"],
    )
    df_b = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([3]), pa.array([6])],
        names=["a", "b"],
    )
    df_c = ctx.create_dataframe([[batch]]).sort(column("a"))

    df_a_i_b = df_a.intersect(df_b).sort(column("a"))

    assert df_c.collect() == df_a_i_b.collect()


def test_except_all():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df_a = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([3, 4, 5]), pa.array([6, 7, 8])],
        names=["a", "b"],
    )
    df_b = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2]), pa.array([4, 5])],
        names=["a", "b"],
    )
    df_c = ctx.create_dataframe([[batch]]).sort(column("a"))

    df_a_e_b = df_a.except_all(df_b).sort(column("a"))

    assert df_c.collect() == df_a_e_b.collect()


def test_collect_partitioned():
    ctx = SessionContext()

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )

    assert [[batch]] == ctx.create_dataframe([[batch]]).collect_partitioned()


def test_union(ctx):
    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df_a = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([3, 4, 5]), pa.array([6, 7, 8])],
        names=["a", "b"],
    )
    df_b = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3, 3, 4, 5]), pa.array([4, 5, 6, 6, 7, 8])],
        names=["a", "b"],
    )
    df_c = ctx.create_dataframe([[batch]]).sort(column("a"))

    df_a_u_b = df_a.union(df_b).sort(column("a"))

    assert df_c.collect() == df_a_u_b.collect()


def test_union_distinct(ctx):
    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )
    df_a = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([3, 4, 5]), pa.array([6, 7, 8])],
        names=["a", "b"],
    )
    df_b = ctx.create_dataframe([[batch]])

    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3, 4, 5]), pa.array([4, 5, 6, 7, 8])],
        names=["a", "b"],
    )
    df_c = ctx.create_dataframe([[batch]]).sort(column("a"))

    df_a_u_b = df_a.union(df_b, distinct=True).sort(column("a"))

    assert df_c.collect() == df_a_u_b.collect()
    assert df_c.collect() == df_a_u_b.collect()


def test_cache(df):
    assert df.cache().collect() == df.collect()


def test_count(df):
    # Get number of rows
    assert df.count() == 3


def test_to_pandas(df):
    # Skip test if pandas is not installed
    pd = pytest.importorskip("pandas")

    # Convert datafusion dataframe to pandas dataframe
    pandas_df = df.to_pandas()
    assert isinstance(pandas_df, pd.DataFrame)
    assert pandas_df.shape == (3, 3)
    assert set(pandas_df.columns) == {"a", "b", "c"}


def test_empty_to_pandas(df):
    # Skip test if pandas is not installed
    pd = pytest.importorskip("pandas")

    # Convert empty datafusion dataframe to pandas dataframe
    pandas_df = df.limit(0).to_pandas()
    assert isinstance(pandas_df, pd.DataFrame)
    assert pandas_df.shape == (0, 3)
    assert set(pandas_df.columns) == {"a", "b", "c"}


def test_to_polars(df):
    # Skip test if polars is not installed
    pl = pytest.importorskip("polars")

    # Convert datafusion dataframe to polars dataframe
    polars_df = df.to_polars()
    assert isinstance(polars_df, pl.DataFrame)
    assert polars_df.shape == (3, 3)
    assert set(polars_df.columns) == {"a", "b", "c"}


def test_empty_to_polars(df):
    # Skip test if polars is not installed
    pl = pytest.importorskip("polars")

    # Convert empty datafusion dataframe to polars dataframe
    polars_df = df.limit(0).to_polars()
    assert isinstance(polars_df, pl.DataFrame)
    assert polars_df.shape == (0, 3)
    assert set(polars_df.columns) == {"a", "b", "c"}


def test_to_arrow_table(df):
    # Convert datafusion dataframe to pyarrow Table
    pyarrow_table = df.to_arrow_table()
    assert isinstance(pyarrow_table, pa.Table)
    assert pyarrow_table.shape == (3, 3)
    assert set(pyarrow_table.column_names) == {"a", "b", "c"}


def test_execute_stream(df):
    stream = df.execute_stream()
    assert all(batch is not None for batch in stream)
    assert not list(stream)  # after one iteration the generator must be exhausted


@pytest.mark.asyncio
async def test_execute_stream_async(df):
    stream = df.execute_stream()
    batches = [batch async for batch in stream]

    assert all(batch is not None for batch in batches)

    # After consuming all batches, the stream should be exhausted
    remaining_batches = [batch async for batch in stream]
    assert not remaining_batches


@pytest.mark.parametrize("schema", [True, False])
def test_execute_stream_to_arrow_table(df, schema):
    stream = df.execute_stream()

    if schema:
        pyarrow_table = pa.Table.from_batches(
            (batch.to_pyarrow() for batch in stream), schema=df.schema()
        )
    else:
        pyarrow_table = pa.Table.from_batches(batch.to_pyarrow() for batch in stream)

    assert isinstance(pyarrow_table, pa.Table)
    assert pyarrow_table.shape == (3, 3)
    assert set(pyarrow_table.column_names) == {"a", "b", "c"}


@pytest.mark.asyncio
@pytest.mark.parametrize("schema", [True, False])
async def test_execute_stream_to_arrow_table_async(df, schema):
    stream = df.execute_stream()

    if schema:
        pyarrow_table = pa.Table.from_batches(
            [batch.to_pyarrow() async for batch in stream], schema=df.schema()
        )
    else:
        pyarrow_table = pa.Table.from_batches(
            [batch.to_pyarrow() async for batch in stream]
        )

    assert isinstance(pyarrow_table, pa.Table)
    assert pyarrow_table.shape == (3, 3)
    assert set(pyarrow_table.column_names) == {"a", "b", "c"}


def test_execute_stream_partitioned(df):
    streams = df.execute_stream_partitioned()
    assert all(batch is not None for stream in streams for batch in stream)
    assert all(
        not list(stream) for stream in streams
    )  # after one iteration all generators must be exhausted


@pytest.mark.asyncio
async def test_execute_stream_partitioned_async(df):
    streams = df.execute_stream_partitioned()

    for stream in streams:
        batches = [batch async for batch in stream]
        assert all(batch is not None for batch in batches)

        # Ensure the stream is exhausted after iteration
        remaining_batches = [batch async for batch in stream]
        assert not remaining_batches


def test_empty_to_arrow_table(df):
    # Convert empty datafusion dataframe to pyarrow Table
    pyarrow_table = df.limit(0).to_arrow_table()
    assert isinstance(pyarrow_table, pa.Table)
    assert pyarrow_table.shape == (0, 3)
    assert set(pyarrow_table.column_names) == {"a", "b", "c"}


def test_to_pylist(df):
    # Convert datafusion dataframe to Python list
    pylist = df.to_pylist()
    assert isinstance(pylist, list)
    assert pylist == [
        {"a": 1, "b": 4, "c": 8},
        {"a": 2, "b": 5, "c": 5},
        {"a": 3, "b": 6, "c": 8},
    ]


def test_to_pydict(df):
    # Convert datafusion dataframe to Python dictionary
    pydict = df.to_pydict()
    assert isinstance(pydict, dict)
    assert pydict == {"a": [1, 2, 3], "b": [4, 5, 6], "c": [8, 5, 8]}


def test_describe(df):
    # Calculate statistics
    df = df.describe()

    # Collect the result
    result = df.to_pydict()

    assert result == {
        "describe": [
            "count",
            "null_count",
            "mean",
            "std",
            "min",
            "max",
            "median",
        ],
        "a": [3.0, 0.0, 2.0, 1.0, 1.0, 3.0, 2.0],
        "b": [3.0, 0.0, 5.0, 1.0, 4.0, 6.0, 5.0],
        "c": [3.0, 0.0, 7.0, 1.7320508075688772, 5.0, 8.0, 8.0],
    }


@pytest.mark.parametrize("path_to_str", [True, False])
def test_write_csv(ctx, df, tmp_path, path_to_str):
    path = str(tmp_path) if path_to_str else tmp_path

    df.write_csv(path, with_header=True)

    ctx.register_csv("csv", path)
    result = ctx.table("csv").to_pydict()
    expected = df.to_pydict()

    assert result == expected


@pytest.mark.parametrize("path_to_str", [True, False])
def test_write_json(ctx, df, tmp_path, path_to_str):
    path = str(tmp_path) if path_to_str else tmp_path

    df.write_json(path)

    ctx.register_json("json", path)
    result = ctx.table("json").to_pydict()
    expected = df.to_pydict()

    assert result == expected


@pytest.mark.parametrize("path_to_str", [True, False])
def test_write_parquet(df, tmp_path, path_to_str):
    path = str(tmp_path) if path_to_str else tmp_path

    df.write_parquet(str(path))
    result = pq.read_table(str(path)).to_pydict()
    expected = df.to_pydict()

    assert result == expected


@pytest.mark.parametrize(
    ("compression", "compression_level"),
    [("gzip", 6), ("brotli", 7), ("zstd", 15)],
)
def test_write_compressed_parquet(df, tmp_path, compression, compression_level):
    path = tmp_path

    df.write_parquet(
        str(path), compression=compression, compression_level=compression_level
    )

    # test that the actual compression scheme is the one written
    for _root, _dirs, files in os.walk(path):
        for file in files:
            if file.endswith(".parquet"):
                metadata = pq.ParquetFile(tmp_path / file).metadata.to_dict()
                for row_group in metadata["row_groups"]:
                    for columns in row_group["columns"]:
                        assert columns["compression"].lower() == compression

    result = pq.read_table(str(path)).to_pydict()
    expected = df.to_pydict()

    assert result == expected


@pytest.mark.parametrize(
    ("compression", "compression_level"),
    [("gzip", 12), ("brotli", 15), ("zstd", 23), ("wrong", 12)],
)
def test_write_compressed_parquet_wrong_compression_level(
    df, tmp_path, compression, compression_level
):
    path = tmp_path

    with pytest.raises(ValueError):
        df.write_parquet(
            str(path),
            compression=compression,
            compression_level=compression_level,
        )


@pytest.mark.parametrize("compression", ["wrong"])
def test_write_compressed_parquet_invalid_compression(df, tmp_path, compression):
    path = tmp_path

    with pytest.raises(ValueError):
        df.write_parquet(str(path), compression=compression)


# not testing lzo because it it not implemented yet
# https://github.com/apache/arrow-rs/issues/6970
@pytest.mark.parametrize("compression", ["zstd", "brotli", "gzip"])
def test_write_compressed_parquet_default_compression_level(df, tmp_path, compression):
    # Test write_parquet with zstd, brotli, gzip default compression level,
    # ie don't specify compression level
    # should complete without error
    path = tmp_path

    df.write_parquet(str(path), compression=compression)


def test_dataframe_export(df) -> None:
    # Guarantees that we have the canonical implementation
    # reading our dataframe export
    table = pa.table(df)
    assert table.num_columns == 3
    assert table.num_rows == 3

    desired_schema = pa.schema([("a", pa.int64())])

    # Verify we can request a schema
    table = pa.table(df, schema=desired_schema)
    assert table.num_columns == 1
    assert table.num_rows == 3

    # Expect a table of nulls if the schema don't overlap
    desired_schema = pa.schema([("g", pa.string())])
    table = pa.table(df, schema=desired_schema)
    assert table.num_columns == 1
    assert table.num_rows == 3
    for i in range(3):
        assert table[0][i].as_py() is None

    # Expect an error when we cannot convert schema
    desired_schema = pa.schema([("a", pa.float32())])
    failed_convert = False
    try:
        table = pa.table(df, schema=desired_schema)
    except Exception:
        failed_convert = True
    assert failed_convert

    # Expect an error when we have a not set non-nullable
    desired_schema = pa.schema([("g", pa.string(), False)])
    failed_convert = False
    try:
        table = pa.table(df, schema=desired_schema)
    except Exception:
        failed_convert = True
    assert failed_convert


def test_dataframe_transform(df):
    def add_string_col(df_internal) -> DataFrame:
        return df_internal.with_column("string_col", literal("string data"))

    def add_with_parameter(df_internal, value: Any) -> DataFrame:
        return df_internal.with_column("new_col", literal(value))

    df = df.transform(add_string_col).transform(add_with_parameter, 3)

    result = df.to_pydict()

    assert result["a"] == [1, 2, 3]
    assert result["string_col"] == ["string data" for _i in range(3)]
    assert result["new_col"] == [3 for _i in range(3)]


def test_dataframe_repr_html_structure(df) -> None:
    """Test that DataFrame._repr_html_ produces expected HTML output structure."""
    import re

    output = df._repr_html_()

    # Since we've added a fair bit of processing to the html output, lets just verify
    # the values we are expecting in the table exist. Use regex and ignore everything
    # between the <th></th> and <td></td>. We also don't want the closing > on the
    # td and th segments because that is where the formatting data is written.

    headers = ["a", "b", "c"]
    headers = [f"<th(.*?)>{v}</th>" for v in headers]
    header_pattern = "(.*?)".join(headers)
    header_matches = re.findall(header_pattern, output, re.DOTALL)
    assert len(header_matches) == 1

    # Update the pattern to handle values that may be wrapped in spans
    body_data = [[1, 4, 8], [2, 5, 5], [3, 6, 8]]

    body_lines = [
        f"<td(.*?)>(?:<span[^>]*?>)?{v}(?:</span>)?</td>"
        for inner in body_data
        for v in inner
    ]
    body_pattern = "(.*?)".join(body_lines)

    body_matches = re.findall(body_pattern, output, re.DOTALL)

    assert len(body_matches) == 1, "Expected pattern of values not found in HTML output"


def test_dataframe_repr_html_values(df):
    """Test that DataFrame._repr_html_ contains the expected data values."""
    html = df._repr_html_()
    assert html is not None

    # Create a more flexible pattern that handles values being wrapped in spans
    # This pattern will match the sequence of values 1,4,8,2,5,5,3,6,8 regardless
    # of formatting
    pattern = re.compile(
        r"<td[^>]*?>(?:<span[^>]*?>)?1(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?4(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?8(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?2(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?5(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?5(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?3(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?6(?:</span>)?</td>.*?"
        r"<td[^>]*?>(?:<span[^>]*?>)?8(?:</span>)?</td>",
        re.DOTALL,
    )

    # Print debug info if the test fails
    matches = re.findall(pattern, html)
    if not matches:
        print(f"HTML output snippet: {html[:500]}...")  # noqa: T201

    assert len(matches) > 0, "Expected pattern of values not found in HTML output"


def test_html_formatter_shared_styles(df, clean_formatter_state):
    """Test that shared styles work correctly across multiple tables."""

    # First, ensure we're using shared styles
    configure_formatter(use_shared_styles=True)

    # Get HTML output for first table - should include styles
    html_first = df._repr_html_()

    # Verify styles are included in first render
    assert "<style>" in html_first
    assert ".expandable-container" in html_first

    # Get HTML output for second table - should NOT include styles
    html_second = df._repr_html_()

    # Verify styles are NOT included in second render
    assert "<style>" not in html_second
    assert ".expandable-container" not in html_second

    # Reset the styles loaded state and verify styles are included again
    reset_styles_loaded_state()
    html_after_reset = df._repr_html_()

    # Verify styles are included after reset
    assert "<style>" in html_after_reset
    assert ".expandable-container" in html_after_reset


def test_html_formatter_no_shared_styles(df, clean_formatter_state):
    """Test that styles are always included when shared styles are disabled."""

    # Configure formatter to NOT use shared styles
    configure_formatter(use_shared_styles=False)

    # Generate HTML multiple times
    html_first = df._repr_html_()
    html_second = df._repr_html_()

    # Verify styles are included in both renders
    assert "<style>" in html_first
    assert "<style>" in html_second
    assert ".expandable-container" in html_first
    assert ".expandable-container" in html_second


def test_html_formatter_manual_format_html(clean_formatter_state):
    """Test direct usage of format_html method with shared styles."""

    # Create sample data
    batch = pa.RecordBatch.from_arrays(
        [pa.array([1, 2, 3]), pa.array([4, 5, 6])],
        names=["a", "b"],
    )

    formatter = get_formatter()

    # First call should include styles
    html_first = formatter.format_html([batch], batch.schema)
    assert "<style>" in html_first

    # Second call should not include styles (using shared styles by default)
    html_second = formatter.format_html([batch], batch.schema)
    assert "<style>" not in html_second

    # Reset loaded state
    reset_styles_loaded_state()

    # After reset, styles should be included again
    html_reset = formatter.format_html([batch], batch.schema)
    assert "<style>" in html_reset

    # Create a new formatter with shared_styles=False
    local_formatter = DataFrameHtmlFormatter(use_shared_styles=False)

    # Both calls should include styles
    local_html_1 = local_formatter.format_html([batch], batch.schema)
    local_html_2 = local_formatter.format_html([batch], batch.schema)

    assert "<style>" in local_html_1
    assert "<style>" in local_html_2