"""app.core.handlers.data_cleaner 单元测试"""

import pytest
import pandas as pd

from app.core.handlers.data_cleaner import DataCleaner


@pytest.fixture
def sample_df():
    return pd.DataFrame({
        'name': [' Alice ', 'Bob', 'Charlie', 'Dave'],
        'age': [25, 30, None, 40],
        'score': [80.5, 90.0, 70.0, 85.0],
        'city': ['Beijing', 'Shanghai', 'Beijing', 'Guangzhou'],
    })


class TestFillNa:
    def test_fill_na_with_value(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('fill_na', columns=['age'], value=0)
        result = cleaner.clean(sample_df)
        assert result['age'].isna().sum() == 0
        assert result.loc[2, 'age'] == 0

    def test_fill_na_all_columns(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('fill_na', value=-1)
        result = cleaner.clean(sample_df)
        assert result.isna().sum().sum() == 0

    def test_fill_na_string_column(self):
        df = pd.DataFrame({'a': ['x', None, 'z']})
        cleaner = DataCleaner()
        cleaner.add_rule('fill_na', columns=['a'], value='unknown')
        result = cleaner.clean(df)
        assert result.loc[1, 'a'] == 'unknown'

    def test_convenience_method(self, sample_df):
        cleaner = DataCleaner()
        cleaner.fill_na(columns='age', value=99)
        result = cleaner.clean(sample_df)
        assert result.loc[2, 'age'] == 99


class TestRemoveDuplicates:
    def test_remove_by_subset(self):
        df = pd.DataFrame({
            'name': ['A', 'B', 'A', 'C'],
            'val': [1, 2, 3, 4],
        })
        cleaner = DataCleaner()
        cleaner.add_rule('remove_duplicates', subset=['name'], keep='first')
        result = cleaner.clean(df)
        assert len(result) == 3
        assert list(result['name']) == ['A', 'B', 'C']

    def test_remove_all_columns(self):
        df = pd.DataFrame({
            'a': [1, 1, 2],
            'b': [10, 10, 20],
        })
        cleaner = DataCleaner()
        cleaner.add_rule('remove_duplicates')
        result = cleaner.clean(df)
        assert len(result) == 2

    def test_no_duplicates(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('remove_duplicates', subset=['name'])
        result = cleaner.clean(sample_df)
        assert len(result) == 4


class TestRemoveRows:
    def test_remove_by_condition(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('remove_rows', condition='age > 25')
        result = cleaner.clean(sample_df)
        assert len(result) == 2

    def test_remove_by_values(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('remove_rows', columns=['city'], values=['Beijing'])
        result = cleaner.clean(sample_df)
        assert len(result) == 2
        assert 'Beijing' not in result['city'].values

    def test_remove_no_match(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('remove_rows', condition='age > 100')
        result = cleaner.clean(sample_df)
        assert len(result) == 0  # condition filter: no rows match age > 100

    def test_convenience_method(self, sample_df):
        cleaner = DataCleaner()
        cleaner.remove_rows(condition='score < 75')
        result = cleaner.clean(sample_df)
        assert len(result) == 1  # condition filter: keeps only Charlie (score=70.0)


class TestConvertType:
    def test_to_float(self):
        df = pd.DataFrame({'val': ['1.5', '2.7', 'abc']})
        cleaner = DataCleaner()
        cleaner.add_rule('convert_type', columns=['val'], target_type='float')
        result = cleaner.clean(df)
        assert result['val'].dtype.kind == 'f'
        assert result.loc[0, 'val'] == 1.5
        assert pd.isna(result.loc[2, 'val'])

    def test_to_int(self):
        df = pd.DataFrame({'val': ['1', '2', '3']})
        cleaner = DataCleaner()
        cleaner.add_rule('convert_type', columns=['val'], target_type='int')
        result = cleaner.clean(df)
        assert result.loc[0, 'val'] == 1

    def test_to_string(self):
        df = pd.DataFrame({'val': [1, 2, 3]})
        cleaner = DataCleaner()
        cleaner.add_rule('convert_type', columns=['val'], target_type='string')
        result = cleaner.clean(df)
        assert result.loc[0, 'val'] == '1'

    def test_missing_column_skipped(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('convert_type', columns=['nonexistent'], target_type='float')
        result = cleaner.clean(sample_df)
        assert len(result) == 4


class TestStripWhitespace:
    def test_strip_specific_columns(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('strip_whitespace', columns=['name'])
        result = cleaner.clean(sample_df)
        assert result.loc[0, 'name'] == 'Alice'

    def test_strip_all_text(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('strip_whitespace')
        result = cleaner.clean(sample_df)
        assert result.loc[0, 'name'] == 'Alice'

    def test_strip_non_text_skipped(self):
        df = pd.DataFrame({'val': [1, 2, 3]})
        cleaner = DataCleaner()
        cleaner.add_rule('strip_whitespace', columns=['val'])
        result = cleaner.clean(df)
        assert list(result['val']) == [1, 2, 3]


class TestNormalizeText:
    def test_lowercase(self):
        df = pd.DataFrame({'name': ['ALICE', 'BOB']})
        cleaner = DataCleaner()
        cleaner.add_rule('normalize_text', columns=['name'], lowercase=True)
        result = cleaner.clean(df)
        assert list(result['name']) == ['alice', 'bob']

    def test_uppercase(self):
        df = pd.DataFrame({'name': ['alice', 'bob']})
        cleaner = DataCleaner()
        cleaner.add_rule('normalize_text', columns=['name'], uppercase=True)
        result = cleaner.clean(df)
        assert list(result['name']) == ['ALICE', 'BOB']

    def test_replace_map(self):
        df = pd.DataFrame({'city': ['BJ', 'SH']})
        cleaner = DataCleaner()
        cleaner.add_rule('normalize_text', columns=['city'], replace_map={'BJ': 'Beijing', 'SH': 'Shanghai'})
        result = cleaner.clean(df)
        assert list(result['city']) == ['Beijing', 'Shanghai']


class TestValidateData:
    def test_validate_logs_but_does_not_modify(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('validate_data', columns=['score'], min_value=0, max_value=100)
        result = cleaner.clean(sample_df)
        assert len(result) == 4

    def test_validate_required(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('validate_data', columns=['age'], required=True)
        result = cleaner.clean(sample_df)
        assert len(result) == 4


class TestChaining:
    def test_multiple_rules(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('strip_whitespace', columns=['name'])
        cleaner.add_rule('fill_na', columns=['age'], value=0)
        cleaner.add_rule('convert_type', columns=['age'], target_type='int')
        result = cleaner.clean(sample_df)
        assert result.loc[0, 'name'] == 'Alice'
        assert result['age'].isna().sum() == 0
        assert result.loc[2, 'age'] == 0

    def test_convenience_chaining(self, sample_df):
        cleaner = DataCleaner()
        cleaner.strip_whitespace('name').fill_na('age', value=0)
        result = cleaner.clean(sample_df)
        assert result.loc[0, 'name'] == 'Alice'
        assert result.loc[2, 'age'] == 0


class TestEdgeCases:
    def test_empty_dataframe(self):
        df = pd.DataFrame({'a': pd.Series([], dtype=float)})
        cleaner = DataCleaner()
        cleaner.add_rule('fill_na', value=0)
        result = cleaner.clean(df)
        assert len(result) == 0

    def test_no_rules(self, sample_df):
        cleaner = DataCleaner()
        result = cleaner.clean(sample_df)
        assert len(result) == 4

    def test_unknown_rule_type(self, sample_df):
        cleaner = DataCleaner()
        cleaner.add_rule('unknown_op', columns=['name'])
        result = cleaner.clean(sample_df)
        assert len(result) == 4

    def test_rule_failure_continues(self, sample_df):
        """A failing rule should not block subsequent rules."""
        cleaner = DataCleaner()
        cleaner.add_rule('convert_type', columns=['nonexistent'], target_type='float')
        cleaner.add_rule('fill_na', columns=['age'], value=0)
        result = cleaner.clean(sample_df)
        assert result.loc[2, 'age'] == 0