import csv
import io
import os

import pytest

from sqlite_utils import utils


@pytest.mark.parametrize(
    "input,expected,should_be_is",
    [
        ({}, None, True),
        ({"foo": "bar"}, None, True),
        (
            {"content": {"$base64": True, "encoded": "aGVsbG8="}},
            {"content": b"hello"},
            False,
        ),
    ],
)
def test_decode_base64_values(input, expected, should_be_is):
    actual = utils.decode_base64_values(input)
    if should_be_is:
        assert actual is input
    else:
        assert actual == expected


@pytest.mark.parametrize(
    "size,expected",
    (
        (1, [["a"], ["b"], ["c"], ["d"]]),
        (2, [["a", "b"], ["c", "d"]]),
        (3, [["a", "b", "c"], ["d"]]),
        (4, [["a", "b", "c", "d"]]),
    ),
)
def test_chunks(size, expected):
    input = ["a", "b", "c", "d"]
    chunks = list(map(list, utils.chunks(input, size)))
    assert chunks == expected


def test_hash_record():
    expected = "d383e7c0ba88f5ffcdd09be660de164b3847401a"
    assert utils.hash_record({"name": "Cleo", "twitter": "CleoPaws"}) == expected
    assert (
        utils.hash_record(
            {"name": "Cleo", "twitter": "CleoPaws", "age": 7}, keys=("name", "twitter")
        )
        == expected
    )
    assert (
        utils.hash_record({"name": "Cleo", "twitter": "CleoPaws", "age": 7}) != expected
    )


def test_maximize_csv_field_size_limit():
    # Reset to default in case other tests have changed it
    csv.field_size_limit(utils.ORIGINAL_CSV_FIELD_SIZE_LIMIT)
    long_value = "a" * 131073
    long_csv = f"id,text\n1,{long_value}"
    fp = io.BytesIO(long_csv.encode("utf-8"))
    # Using rows_from_file should error
    with pytest.raises(csv.Error):
        rows, _ = utils.rows_from_file(fp, utils.Format.CSV)
        list(rows)
    # But if we call maximize_csv_field_size_limit() first it should be OK:
    utils.maximize_csv_field_size_limit()
    fp2 = io.BytesIO(long_csv.encode("utf-8"))
    rows2, _ = utils.rows_from_file(fp2, utils.Format.CSV)
    rows_list2 = list(rows2)
    assert len(rows_list2) == 1
    assert rows_list2[0]["id"] == "1"
    assert rows_list2[0]["text"] == long_value


@pytest.mark.parametrize(
    "input,expected",
    (
        ({"foo": {"bar": 1}}, {"foo_bar": 1}),
        ({"foo": {"bar": [1, 2, {"baz": 3}]}}, {"foo_bar": [1, 2, {"baz": 3}]}),
        ({"foo": {"bar": 1, "baz": {"three": 3}}}, {"foo_bar": 1, "foo_baz_three": 3}),
    ),
)
def test_flatten(input, expected):
    assert utils.flatten(input) == expected


@pytest.mark.parametrize(
    "input,expected",
    (
        ([], []),
        (["id", "name"], ["id", "name"]),
        (["id", "id"], ["id", "id_2"]),
        (["id", "id", "id"], ["id", "id_2", "id_3"]),
        # A renamed duplicate must not clobber a real column called id_2
        (["id", "id", "id_2"], ["id", "id_3", "id_2"]),
        (["id_2", "id", "id"], ["id_2", "id", "id_3"]),
        (["id", "id", "id_2", "id_2"], ["id", "id_3", "id_2", "id_2_2"]),
    ),
)
def test_dedupe_keys(input, expected):
    assert utils.dedupe_keys(input) == expected


def test_rows_to_csv_returns_string():
    rows = [{"id": 1, "name": "Cleo"}, {"id": 2, "name": "Pancakes"}]
    assert utils.rows_to_csv(rows) == "id,name\r\n1,Cleo\r\n2,Pancakes\r\n"


def test_rows_to_csv_writes_to_fp():
    fp = io.StringIO()
    result = utils.rows_to_csv([{"id": 1, "name": "Cleo"}], fp=fp)
    assert result is None
    assert fp.getvalue() == "id,name\r\n1,Cleo\r\n"


def test_rows_to_csv_no_headers():
    csv_string = utils.rows_to_csv([{"id": 1, "name": "Cleo"}], no_headers=True)
    assert csv_string == "1,Cleo\r\n"


def test_rows_to_csv_empty_rows():
    assert utils.rows_to_csv([]) == ""
    assert utils.rows_to_csv([], headers=["id", "name"]) == "id,name\r\n"


def test_update_wrapper_reports_honest_bytes_for_utf16(tmpdir):
    # Regression test for issue #439: UpdateWrapper used to count decoded
    # *characters* (len(line)) against a progress length measured in bytes.
    # For utf-16-le every ASCII character is encoded as 2 bytes, so the
    # reported progress topped out at ~50% of the file even though reading
    # had actually finished - looking like a stall. It should now track the
    # underlying binary stream's position, so total reported progress
    # matches the file size exactly regardless of encoding.
    path = str(tmpdir / "utf16.csv")
    text = "id,name\n" + "".join(f"{i},Alice{i}\n" for i in range(500))
    with open(path, "wb") as fp:
        fp.write(text.encode("utf-16-le"))
    file_length = os.path.getsize(path)

    reported = []
    with open(path, "rb") as fp:
        decoded = io.TextIOWrapper(fp, encoding="utf-16-le")
        wrapper = utils.UpdateWrapper(decoded, reported.append)
        for _line in wrapper:
            pass

    assert sum(reported) == file_length