import pandas as pd

from routes.sales_routes import _build_top_product_chart_data


def test_top_product_chart_aggregates_sku_rows_before_ranking():
    rows = pd.DataFrame(
        [
            {'pid': 'P1', 'name': '同名商品', 'amount': 100},
            {'pid': 'P1', 'name': '同名商品', 'amount': 50},
            {'pid': 'P2', 'name': '同名商品', 'amount': 90},
            {'pid': 'P3', 'name': '獨立商品', 'amount': 200},
            {'pid': 'P4', 'name': '零業績商品', 'amount': 0},
        ]
    )

    result = _build_top_product_chart_data(rows, 'pid', 'name', 'amount', 'amount')

    assert result['chart_values'] == [200.0, 150.0, 90.0]
    assert result['labels'] == ['獨立商品', '同名商品 [P1]', '同名商品 [P2]']
    assert result['metric_label'] == '銷售金額 ($)'


def test_top_product_chart_returns_explicit_empty_contract():
    result = _build_top_product_chart_data(
        pd.DataFrame(columns=['name', 'amount']),
        None,
        'name',
        'amount',
        'qty',
    )

    assert result == {
        'labels': [],
        'chart_values': [],
        'metric_label': '銷售數量',
    }