import pytest

from app.utils.excel_export import (
    EXPORT_MAX_ROWS,
    ExportColumn,
    ExportValidationError,
    filter_export_columns,
    assert_export_row_count,
)


COLS = [
    ExportColumn(title="账号", field="userNo"),
    ExportColumn(title="姓名", field="nickName"),
    ExportColumn(title="状态", field="status", dict_type="sys_status"),
]


def test_filter_export_columns_keeps_order_and_ignores_unknown():
    out = filter_export_columns(COLS, ["status", "unknown", "userNo"])
    assert [c.field for c in out] == ["status", "userNo"]


def test_filter_export_columns_none_returns_all():
    out = filter_export_columns(COLS, None)
    assert [c.field for c in out] == ["userNo", "nickName", "status"]


def test_assert_export_row_count_empty():
    with pytest.raises(ExportValidationError) as ei:
        assert_export_row_count(0)
    assert "没有可导出的数据" in str(ei.value)


def test_assert_export_row_count_over_limit():
    with pytest.raises(ExportValidationError) as ei:
        assert_export_row_count(EXPORT_MAX_ROWS + 1)
    assert "50000" in str(ei.value)


def test_assert_export_row_count_ok():
    assert_export_row_count(1)
    assert_export_row_count(EXPORT_MAX_ROWS)