from __future__ import annotations

from persist import build_result
from pipeline import MallOutcome, run_selection
from rules import Candidate, PurchaseLine, normalize_vendor


HANGZHOU = "杭州小药药自营旗舰店"
GUANGDONG = "广东壹号药业有限公司"


def _purchase(**overrides) -> PurchaseLine:
    data = {
        "approval_no": "国药准字H20100001",
        "sale_price": 100.0,
        "qty": 10.0,
        "row_no": 2,
        "generic_name": "阿莫西林",
        "oms_id": 2026100201,
        "bar_code": "06901234567890",
    }
    data.update(overrides)
    return PurchaseLine(**data)


def _candidate(**overrides) -> Candidate:
    vendor_raw = overrides.get("vendor_raw", GUANGDONG)
    data = {
        "mall_name": "1号药城",
        "sku_id": "SKU1",
        "name": "测试药品",
        "spec": "0.25g",
        "price": 90.0,
        "expiry_raw": "13",
        "expiry_months": 13.0,
        "vendor_raw": vendor_raw,
        "vendor_norm": normalize_vendor(vendor_raw),
        "stock": 100.0,
        "extra": {},
    }
    data.update(overrides)
    if "vendor_raw" in overrides and "vendor_norm" not in overrides:
        data["vendor_norm"] = normalize_vendor(overrides["vendor_raw"])
    return Candidate(**data)


def test_missing_sale_price_is_business_fail():
    result = run_selection(
        _purchase(sale_price=None),
        [MallOutcome("1号药城", candidates=[_candidate()])],
    )
    assert result.kind == "BUSINESS_FAIL"
    assert result.reason == "NO_SALE_PRICE"
    assert result.allocations == []


def test_missing_qty_is_business_fail():
    result = run_selection(_purchase(qty=0), [MallOutcome("药帮忙")])
    assert result.kind == "BUSINESS_FAIL"
    assert result.reason == "NO_QTY"


def test_query_error_without_enough_stock_is_system_fail():
    result = run_selection(
        _purchase(),
        [
            MallOutcome("1号药城", failed_reason="QUERY_FAILED:timeout"),
            MallOutcome("药帮忙", candidates=[]),
        ],
    )
    assert result.kind == "SYSTEM_FAIL"
    assert result.allocations == []
    assert result.mall_errors["1号药城"] == "QUERY_FAILED:timeout"


def test_empty_hit_is_no_hit():
    result = run_selection(
        _purchase(),
        [
            MallOutcome("1号药城", candidates=[]),
            MallOutcome("药帮忙", candidates=[]),
        ],
    )
    assert result.kind == "BUSINESS_FAIL"
    assert result.reason == "NO_HIT"


def test_all_rejected_uses_rule_reason():
    result = run_selection(
        _purchase(),
        [MallOutcome("1号药城", candidates=[_candidate(vendor_raw="路边药店")])],
    )
    assert result.kind == "BUSINESS_FAIL"
    assert result.reason == "NOT_SELF_WAREHOUSE"
    assert any(item.reason == "NOT_SELF_WAREHOUSE" for item in result.rejected)


def test_split_across_malls_is_success():
    result = run_selection(
        _purchase(),
        [
            MallOutcome(
                "药帮忙",
                candidates=[
                    _candidate(
                        sku_id="HZ",
                        mall_name="药帮忙",
                        vendor_raw=HANGZHOU,
                        stock=3.0,
                    )
                ],
            ),
            MallOutcome(
                "1号药城",
                candidates=[_candidate(sku_id="GD", stock=20.0)],
            ),
        ],
    )
    assert result.kind == "SUCCESS"
    assert result.reason == "SELECTED"
    qtys = [(item.candidate.sku_id, item.qty) for item in result.allocations]
    assert qtys == [("HZ", 3), ("GD", 7)]


def test_one_mall_login_failed_other_fills_is_success():
    result = run_selection(
        _purchase(),
        [
            MallOutcome("药帮忙", failed_reason="LOGIN_FAILED:timeout"),
            MallOutcome("1号药城", candidates=[_candidate(stock=20.0)]),
        ],
    )
    assert result.kind == "SUCCESS"
    assert result.allocations[0].qty == 10


def test_one_mall_login_failed_other_short_is_system_fail():
    result = run_selection(
        _purchase(),
        [
            MallOutcome("药帮忙", failed_reason="LOGIN_FAILED:timeout"),
            MallOutcome("1号药城", candidates=[_candidate(stock=4.0)]),
        ],
    )
    assert result.kind == "SYSTEM_FAIL"
    assert result.allocations == []
    assert result.mall_errors["药帮忙"].startswith("LOGIN_FAILED")


def test_short_stock_with_rejects_is_stock_insufficient():
    result = run_selection(
        _purchase(),
        [
            MallOutcome(
                "药帮忙",
                candidates=[
                    _candidate(
                        sku_id="HZ",
                        mall_name="药帮忙",
                        vendor_raw=HANGZHOU,
                        stock=4.0,
                    ),
                    _candidate(
                        sku_id="ROAD",
                        mall_name="药帮忙",
                        vendor_raw="路边药店",
                        stock=100.0,
                    ),
                ],
            ),
            MallOutcome(
                "1号药城",
                candidates=[
                    _candidate(
                        sku_id="EXP",
                        expiry_raw="6",
                        expiry_months=6.0,
                        stock=100.0,
                    )
                ],
            ),
        ],
    )
    assert result.kind == "BUSINESS_FAIL"
    assert result.reason == "STOCK_INSUFFICIENT;EXPIRY_LT_12M;NOT_SELF_WAREHOUSE"
    assert result.allocations == []


# 毛利和效期同时命中时，原因里两句都在，不再只留优先级更高的一条。
def test_margin_and_expiry_both_in_reason():
    result = run_selection(
        _purchase(),
        [
            MallOutcome(
                "1号药城",
                candidates=[
                    _candidate(
                        sku_id="MARGIN",
                        vendor_raw=HANGZHOU,
                        price=99.0,
                        stock=100.0,
                    ),
                    _candidate(
                        sku_id="EXP",
                        vendor_raw=GUANGDONG,
                        price=90.0,
                        expiry_raw="6",
                        expiry_months=6.0,
                        stock=100.0,
                    ),
                ],
            )
        ],
    )
    built = build_result(_purchase(), result)
    assert "毛利不大于 4%" in built.deal_result
    assert "效期不足 12 个月" in built.deal_result