"""build_plan_product / upsert 应保持 id 稳定，并拒绝外键无效的产品行 id。"""
from unittest.mock import MagicMock

import pytest
from fastapi import HTTPException

from app.schemas.pl.plan import PlanProductCreate
from app.services import pl_plan_service as svc
from app.services.pl_plan_service import (
    build_plan_product,
    resolve_plan_product_id_for_upsert,
)


def _minimal_prod(**kwargs) -> PlanProductCreate:
    data = {
        "product_id": "crm-p1",
        "product_no": "P001",
        "product_name": "甲醇",
    }
    data.update(kwargs)
    return PlanProductCreate(**data)


def test_build_plan_product_keeps_row_id():
    result = build_plan_product(
        tenant_no="t1",
        plan_id="plan-1",
        plan_type="outbound",
        prod=_minimal_prod(),
        order_num=0,
        user_id="u1",
        dept_id="d1",
        product_row_id="pp-1",
    )
    assert result.id == "pp-1"


def test_build_plan_product_generates_when_missing(monkeypatch):
    monkeypatch.setattr(svc, "generate_uuid", lambda: "gen-1")
    result = build_plan_product(
        tenant_no="t1",
        plan_id="plan-1",
        plan_type="outbound",
        prod=_minimal_prod(),
        order_num=0,
        user_id="u1",
        dept_id="d1",
    )
    assert result.id == "gen-1"


def test_upsert_plan_product_rejects_foreign_id():
    with pytest.raises(HTTPException) as ei:
        resolve_plan_product_id_for_upsert(
            plan_id="plan-1",
            payload_id="pp-other-plan",
            existing_by_id={},
        )
    assert ei.value.status_code == 422


def test_upsert_plan_product_keeps_payload_id():
    existing = MagicMock()
    existing.id = "pp-keep"
    existing.plan_id = "plan-1"
    row_id, row = resolve_plan_product_id_for_upsert(
        plan_id="plan-1",
        payload_id="pp-keep",
        existing_by_id={"pp-keep": existing},
    )
    assert row_id == "pp-keep"
    assert row is existing


def test_upsert_plan_product_generates_when_missing(monkeypatch):
    monkeypatch.setattr(svc, "generate_uuid", lambda: "new-pp")
    row_id, row = resolve_plan_product_id_for_upsert(
        plan_id="plan-1",
        payload_id=None,
        existing_by_id={},
    )
    assert row_id == "new-pp"
    assert row is None