tests/unit_tests/commands/databases/excel_reader_test.py

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import io
from datetime import datetime
from typing import Any

import numpy as np
import pytest
import xlsxwriter
from werkzeug.datastructures import FileStorage
from xlsxwriter.workbook import Worksheet

from superset.commands.database.exceptions import DatabaseUploadFailed
from superset.commands.database.uploaders.excel_reader import (
    ExcelReader,
    ExcelReaderOptions,
)
from tests.unit_tests.fixtures.common import create_excel_file

EXCEL_DATA: dict[str, list[Any]] = {
    "Name": ["name1", "name2", "name3"],
    "Age": [30, 25, 20],
    "City": ["city1", "city2", "city3"],
    "Birth": ["1990-02-01", "1995-02-01", "2000-02-01"],
}

EXCEL_WITH_NULLS: dict[str, list[Any]] = {
    "Name": ["name1", "name2", "name3"],
    "Age": ["N/A", 25, 20],
    "City": ["city1", "None", "city3"],
    "Birth": ["1990-02-01", "1995-02-01", "2000-02-01"],
}

EXCEL_DATA_DECIMAL_CHAR = {
    "Name": ["name1"],
    "Age": ["30,1"],
    "City": ["city1"],
    "Birth": ["1990-02-01"],
}


def write_data_to_worksheet(
    worksheet: Worksheet, header: list[str], data: list[list[Any]]
):
    all_data = [header] + data
    row = 0
    col = 0
    for name, age in all_data:
        worksheet.write(row, col, name)
        worksheet.write(row, col + 1, age)
        row += 1


@pytest.mark.parametrize(
    "file, options, expected_cols, expected_values",
    [
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", 30, "city1", "1990-02-01"],
                ["name2", 25, "city2", "1995-02-01"],
                ["name3", 20, "city3", "2000-02-01"],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                columns_read=["Name", "Age"],
            ),
            ["Name", "Age"],
            [
                ["name1", 30],
                ["name2", 25],
                ["name3", 20],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                columns_read=[],
            ),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", 30, "city1", "1990-02-01"],
                ["name2", 25, "city2", "1995-02-01"],
                ["name3", 20, "city3", "2000-02-01"],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                rows_to_read=1,
            ),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", 30.0, "city1", "1990-02-01"],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                rows_to_read=1,
                columns_read=["Name", "Age"],
            ),
            ["Name", "Age"],
            [
                ["name1", 30.0],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                skip_rows=1,
            ),
            ["name1", 30, "city1", "1990-02-01"],
            [
                ["name2", 25.0, "city2", "1995-02-01"],
                ["name3", 20.0, "city3", "2000-02-01"],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA),
            ExcelReaderOptions(
                column_dates=["Birth"],
            ),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", 30, "city1", datetime(1990, 2, 1, 0, 0)],
                ["name2", 25, "city2", datetime(1995, 2, 1, 0, 0)],
                ["name3", 20, "city3", datetime(2000, 2, 1, 0, 0)],
            ],
        ),
        (
            create_excel_file(EXCEL_WITH_NULLS),
            ExcelReaderOptions(
                null_values=["N/A", "None"],
            ),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", np.nan, "city1", "1990-02-01"],
                ["name2", 25.0, np.nan, "1995-02-01"],
                ["name3", 20.0, "city3", "2000-02-01"],
            ],
        ),
        (
            create_excel_file(EXCEL_DATA_DECIMAL_CHAR),
            ExcelReaderOptions(
                decimal_character=",",
            ),
            ["Name", "Age", "City", "Birth"],
            [
                ["name1", 30.1, "city1", "1990-02-01"],
            ],
        ),
    ],
)
def test_excel_reader_file_to_dataframe(file, options, expected_cols, expected_values):
    excel_reader = ExcelReader(
        options=options,
    )
    df = excel_reader.file_to_dataframe(file)
    assert df.columns.tolist() == expected_cols
    actual_values = df.values.tolist()
    for i in range(len(expected_values)):
        for j in range(len(expected_values[i])):
            expected_val = expected_values[i][j]
            actual_val = actual_values[i][j]

            # Check if both values are NaN
            if isinstance(expected_val, float) and isinstance(actual_val, float):
                assert np.isnan(expected_val) == np.isnan(actual_val)
            else:
                assert expected_val == actual_val
    file.close()


def test_excel_reader_index_column():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(index_column="Name"),
    )
    df = excel_reader.file_to_dataframe(create_excel_file(EXCEL_DATA))
    assert df.index.name == "Name"


def test_excel_reader_wrong_index_column():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(index_column="wrong"),
    )
    with pytest.raises(DatabaseUploadFailed) as ex:
        excel_reader.file_to_dataframe(create_excel_file(EXCEL_DATA))
    assert str(ex.value) == ("Parsing error: Index wrong invalid (sheet: 0)")


def test_excel_reader_wrong_columns_to_read():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(columns_read=["xpto"]),
    )
    with pytest.raises(DatabaseUploadFailed) as ex:
        excel_reader.file_to_dataframe(create_excel_file(EXCEL_DATA))
    assert str(ex.value) == (
        "Parsing error: Usecols do not match columns, "
        "columns expected but not found: ['xpto'] (sheet: 0)"
    )


def test_excel_reader_wrong_date():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(column_dates=["xpto"]),
    )
    with pytest.raises(DatabaseUploadFailed) as ex:
        excel_reader.file_to_dataframe(create_excel_file(EXCEL_DATA))
    assert str(ex.value) == (
        "Parsing error: Missing column provided to 'parse_dates': 'xpto' (sheet: 0)"
    )


def test_excel_reader_invalid_file():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(),
    )
    with pytest.raises(DatabaseUploadFailed) as ex:
        excel_reader.file_to_dataframe(FileStorage(io.BytesIO(b"c1")))
    assert str(ex.value) == (
        "Parsing error: Excel file format cannot be determined, you must specify an engine manually."  # noqa: E501
    )


def test_excel_reader_metadata():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(),
    )
    file = create_excel_file(EXCEL_DATA)
    metadata = excel_reader.file_metadata(file)
    assert metadata == {
        "items": [
            {"column_names": ["Name", "Age", "City", "Birth"], "sheet_name": "Sheet1"}
        ]
    }
    file.close()


def test_excel_reader_metadata_mul_sheets():
    buffer = io.BytesIO()
    workbook = xlsxwriter.Workbook(buffer)

    worksheet1 = workbook.add_worksheet("Sheet1")
    header1 = ["col11", "col12"]
    data1 = [["v11", "v12"]]
    write_data_to_worksheet(worksheet1, header1, data1)

    worksheet2 = workbook.add_worksheet("Sheet2")
    header2 = ["col21", "col22"]
    data2 = [["v21", "v22"]]
    write_data_to_worksheet(worksheet2, header2, data2)
    workbook.close()

    file = FileStorage(stream=buffer, filename="test.xls")

    excel_reader = ExcelReader(
        options=ExcelReaderOptions(),
    )
    metadata = excel_reader.file_metadata(file)
    assert metadata == {
        "items": [
            {"column_names": ["col11", "col12"], "sheet_name": "Sheet1"},
            {"column_names": ["col21", "col22"], "sheet_name": "Sheet2"},
        ]
    }
    file.close()


def test_excel_reader_file_metadata_invalid_file():
    excel_reader = ExcelReader(
        options=ExcelReaderOptions(),
    )
    with pytest.raises(DatabaseUploadFailed) as ex:
        excel_reader.file_metadata(FileStorage(io.BytesIO(b"1")))
    assert str(ex.value) == ("Excel file format cannot be determined")