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

import pytest
import pandas as pd

from app.core.handlers.rule_engine import (
    apply_rules,
    _split_quantity_unit,
    _extract_spec_from_name,
    _normalize_unit,
    _compute_quantity_from_total,
    _fill_missing,
    _mark_gift,
)


@pytest.fixture
def sample_df():
    return pd.DataFrame({
        'name': ['农夫山泉550ml*24', '蒙牛纯牛奶', '可口可乐330ml*6'],
        'quantity_raw': ['2箱', '5', '3提'],
        'unit_price': [28.8, 3.5, 10.8],
        'total_price': [57.6, 17.5, 32.4],
    })


class TestSplitQuantityUnit:
    def test_split_with_unit(self):
        df = pd.DataFrame({'quantity_raw': ['2箱', '5瓶', '3提']})
        result = _split_quantity_unit(df, 'quantity_raw')
        assert list(result['quantity']) == [2.0, 5.0, 3.0]
        assert list(result['unit']) == ['箱', '瓶', '提']

    def test_split_number_only(self):
        df = pd.DataFrame({'quantity_raw': ['10', '20']})
        result = _split_quantity_unit(df, 'quantity_raw')
        assert list(result['quantity']) == [10.0, 20.0]

    def test_split_with_synonyms(self):
        df = pd.DataFrame({'quantity_raw': ['2件']})
        dictionary = {'unit_synonyms': {'件': '箱'}, 'default_unit': '瓶'}
        result = _split_quantity_unit(df, 'quantity_raw', dictionary)
        assert result.loc[0, 'unit'] == '箱'

    def test_split_missing_column(self):
        df = pd.DataFrame({'other': [1, 2]})
        result = _split_quantity_unit(df, 'quantity_raw')
        assert 'quantity' not in result.columns

    def test_split_invalid_value(self):
        df = pd.DataFrame({'quantity_raw': ['abc']})
        result = _split_quantity_unit(df, 'quantity_raw')
        assert result.loc[0, 'quantity'] == 0.0


class TestExtractSpecFromName:
    def test_extract_550ml_24(self):
        df = pd.DataFrame({'name': ['农夫山泉550ml*24']})
        result = _extract_spec_from_name(df, 'name')
        assert result.loc[0, 'package_quantity'] == 24

    def test_extract_330ml_6(self):
        df = pd.DataFrame({'name': ['可口可乐330ml*6']})
        result = _extract_spec_from_name(df, 'name')
        assert result.loc[0, 'package_quantity'] == 6

    def test_extract_1_star_pattern(self):
        df = pd.DataFrame({'name': ['啤酒1*12']})
        result = _extract_spec_from_name(df, 'name')
        assert result.loc[0, 'package_quantity'] == 12

    def test_no_spec(self):
        df = pd.DataFrame({'name': ['蒙牛纯牛奶']})
        result = _extract_spec_from_name(df, 'name')
        assert result.loc[0, 'package_quantity'] is None

    def test_missing_column(self):
        df = pd.DataFrame({'other': ['test']})
        result = _extract_spec_from_name(df, 'name')
        assert 'package_quantity' not in result.columns

    def test_with_ignore_words(self):
        df = pd.DataFrame({'name': ['新品 农夫山泉550ml*24']})
        dictionary = {'ignore_words': ['新品'], 'name_patterns': []}
        result = _extract_spec_from_name(df, 'name', dictionary)
        assert result.loc[0, 'package_quantity'] == 24


class TestNormalizeUnit:
    def test_map_units(self):
        df = pd.DataFrame({'unit': ['箱', '提', '盒', '瓶'], 'quantity': [1, 2, 3, 4]})
        unit_map = {'箱': '件', '提': '件', '盒': '件'}
        result = _normalize_unit(df, 'unit', unit_map)
        # _normalize_unit maps via unit_map, then converts 件→瓶 as packed unit
        assert list(result['unit']) == ['瓶', '瓶', '瓶', '瓶']

    def test_convert_quantity_for_packed_units(self):
        df = pd.DataFrame({
            'unit': ['箱', '瓶'],
            'quantity': [2, 5],
            'package_quantity': [12, None],
        })
        unit_map = {'箱': '件'}
        result = _normalize_unit(df, 'unit', unit_map)
        assert result.loc[0, 'quantity'] == 24  # 2 * 12
        assert result.loc[1, 'quantity'] == 5   # unchanged

    def test_missing_column(self):
        df = pd.DataFrame({'other': [1]})
        result = _normalize_unit(df, 'unit', {})
        assert 'unit' not in result.columns


class TestComputeQuantityFromTotal:
    def test_compute_when_qty_zero(self):
        df = pd.DataFrame({
            'quantity': [0, 5, 0],
            'unit_price': [10.0, 20.0, 0.0],
            'total_price': [50.0, 100.0, 30.0],
        })
        result = _compute_quantity_from_total(df)
        assert result.loc[0, 'quantity'] == 5.0  # 50 / 10
        assert result.loc[1, 'quantity'] == 5     # unchanged

    def test_no_compute_when_qty_positive(self):
        df = pd.DataFrame({
            'quantity': [3, 5],
            'unit_price': [10.0, 20.0],
            'total_price': [50.0, 100.0],
        })
        result = _compute_quantity_from_total(df)
        assert list(result['quantity']) == [3, 5]


class TestFillMissing:
    def test_fill_existing_column(self):
        df = pd.DataFrame({'a': [1, None, 3], 'b': [None, 2, None]})
        result = _fill_missing(df, {'a': 0, 'b': 99})
        assert result.loc[1, 'a'] == 0
        assert result.loc[0, 'b'] == 99

    def test_fill_new_column(self):
        df = pd.DataFrame({'a': [1, 2]})
        result = _fill_missing(df, {'new_col': 'default'})
        assert list(result['new_col']) == ['default', 'default']


class TestMarkGift:
    def test_gift_by_zero_price(self):
        df = pd.DataFrame({
            'name': ['商品A', '商品B'],
            'unit_price': [10.0, 0.0],
            'total_price': [20.0, 0.0],
        })
        result = _mark_gift(df)
        assert result.loc[0, 'is_gift'] == False
        assert result.loc[1, 'is_gift'] == True

    def test_gift_by_name(self):
        df = pd.DataFrame({
            'name': ['赠品-杯子', '商品A'],
            'unit_price': [0.0, 10.0],
            'total_price': [0.0, 20.0],
        })
        result = _mark_gift(df)
        assert result.loc[0, 'is_gift'] == True
        assert result.loc[1, 'is_gift'] == False

    def test_gift_no_price_columns(self):
        df = pd.DataFrame({'name': ['赠品', '正常']})
        result = _mark_gift(df)
        assert result.loc[0, 'is_gift'] == True
        assert result.loc[1, 'is_gift'] == False


class TestApplyRules:
    def test_multiple_rules(self, sample_df):
        rules = [
            {'type': 'split_quantity_unit', 'source': 'quantity_raw'},
            {'type': 'extract_spec_from_name', 'source': 'name'},
            {'type': 'mark_gift'},
            {'type': 'fill_missing', 'fills': {'unit': '瓶'}},
        ]
        result = apply_rules(sample_df, rules)
        assert 'quantity' in result.columns
        assert 'unit' in result.columns
        assert 'package_quantity' in result.columns
        assert 'is_gift' in result.columns

    def test_empty_rules(self, sample_df):
        result = apply_rules(sample_df, [])
        assert len(result) == len(sample_df)

    def test_none_rules(self, sample_df):
        result = apply_rules(sample_df, None)
        assert len(result) == len(sample_df)

    def test_unknown_rule_type(self, sample_df):
        rules = [{'type': 'unknown_operation'}]
        result = apply_rules(sample_df, rules)
        assert len(result) == len(sample_df)

    def test_with_dictionary(self):
        df = pd.DataFrame({
            'name': ['农夫山泉550ml*24'],
            'quantity_raw': ['2箱'],
        })
        dictionary = {
            'unit_synonyms': {'箱': '件'},
            'default_unit': '瓶',
            'ignore_words': [],
            'name_patterns': [],
            'pack_multipliers': {'件': 12},
            'default_package_quantity': 1,
        }
        rules = [
            {'type': 'split_quantity_unit', 'source': 'quantity_raw'},
            {'type': 'extract_spec_from_name', 'source': 'name'},
            {'type': 'normalize_unit', 'target': 'unit', 'map': {'箱': '件'}},
        ]
        result = apply_rules(df, rules, dictionary)
        assert 'quantity' in result.columns
        assert 'unit' in result.columns