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import io

import pandas as pd
import pyarrow as pa
import pytest

from superset.utils import csv


def test_escape_value():
    result = csv.escape_value("value")
    assert result == "value"

    result = csv.escape_value("-10")
    assert result == "-10"

    result = csv.escape_value("@value")
    assert result == "'@value"

    result = csv.escape_value("+value")
    assert result == "'+value"

    result = csv.escape_value("-value")
    assert result == "'-value"

    result = csv.escape_value("=value")
    assert result == "'=value"

    result = csv.escape_value("|value")
    assert result == "'\|value"

    result = csv.escape_value("%value")
    assert result == "'%value"

    result = csv.escape_value("=cmd|' /C calc'!A0")
    assert result == "'=cmd\|' /C calc'!A0"

    result = csv.escape_value('""=10+2')
    assert result == '\'""=10+2'

    result = csv.escape_value(" =10+2")
    assert result == "' =10+2"


def test_df_to_escaped_csv():
    csv_rows = [
        ["col_a", "=func()"],
        ["-10", "=cmd|' /C calc'!A0"],
        ["a", '""=b'],
        [" =a", "b"],
    ]
    csv_str = "\n".join([",".join(row) for row in csv_rows])

    df = pd.read_csv(io.StringIO(csv_str))

    escaped_csv_str = csv.df_to_escaped_csv(df, encoding="utf8", index=False)
    escaped_csv_rows = [row.split(",") for row in escaped_csv_str.strip().split("\n")]

    assert escaped_csv_rows == [
        ["col_a", "'=func()"],
        ["-10", "'=cmd\|' /C calc'!A0"],
        ["a", "'=b"],  # pandas seems to be removing the leading ""
        ["' =a", "b"],
    ]

    df = pa.array([1, None]).to_pandas(integer_object_nulls=True).to_frame()
    assert csv.df_to_escaped_csv(df, encoding="utf8", index=False) == '0\n1\n""\n'