import pytest


@pytest.mark.anyio
async def test_list_products_returns_material_cost_for_finished_goods(client):
    resp = await client.get("/api/products")
    assert resp.status_code == 200
    rows = resp.json()
    finished = next(row for row in rows if row["sku"] == "MOLD-STD")
    assert float(finished["material_cost"]) == 20.0


@pytest.mark.anyio
async def test_create_product_finished_resets_stock_bounds(client):
    resp = await client.post(
        "/api/products",
        json={
            "sku": "FG-NEW",
            "name": "新成品",
            "item_type": "finished",
            "unit": "件",
            "min_stock": 10,
            "max_stock": 99,
            "cost_price": 12,
            "sale_price": 20,
        },
    )
    assert resp.status_code == 201
    body = resp.json()
    assert body["sku"] == "FG-NEW"
    assert body["min_stock"] == 0
    assert body["max_stock"] == 0


@pytest.mark.anyio
async def test_update_product_rejects_duplicate_sku(client):
    created = await client.post(
        "/api/products",
        json={
            "sku": "FG-2",
            "name": "成品2",
            "item_type": "finished",
            "unit": "件",
            "cost_price": 0,
            "sale_price": 1,
        },
    )
    assert created.status_code == 201
    product_id = created.json()["id"]

    resp = await client.put(
        f"/api/products/{product_id}",
        json={
            "sku": "MOLD-STD",
            "name": "改名",
            "item_type": "finished",
            "unit": "件",
            "cost_price": 0,
            "sale_price": 1,
        },
    )
    assert resp.status_code == 400
    assert resp.json()["detail"] == "SKU已存在"


@pytest.mark.anyio
async def test_delete_product_soft_deletes_record(client):
    created = await client.post(
        "/api/products",
        json={
            "sku": "MAT-DEL",
            "name": "待删物料",
            "item_type": "material",
            "unit": "kg",
            "cost_price": 2,
            "sale_price": 0,
        },
    )
    assert created.status_code == 201
    product_id = created.json()["id"]

    deleted = await client.delete(f"/api/products/{product_id}")
    assert deleted.status_code == 200
    assert deleted.json()["message"] == "产品已删除"

    listed = await client.get("/api/products")
    assert listed.status_code == 200
    assert all(row["id"] != product_id for row in listed.json())


@pytest.mark.anyio
async def test_get_product_bom_returns_line_costs(client):
    resp = await client.get("/api/products/2/materials")
    assert resp.status_code == 200
    body = resp.json()
    assert body["product_id"] == 2
    assert float(body["total_material_cost"]) == 20.0
    assert len(body["items"]) == 1
    assert body["items"][0]["material_sku"] == "MAT-001"


@pytest.mark.anyio
async def test_replace_product_bom_rewrites_items(client):
    created = await client.post(
        "/api/products",
        json={
            "sku": "MAT-002",
            "name": "铝材",
            "item_type": "material",
            "unit": "kg",
            "cost_price": 5,
            "sale_price": 0,
        },
    )
    assert created.status_code == 201
    material_id = created.json()["id"]

    replaced = await client.put(
        "/api/products/2/materials",
        json={
            "items": [
                {"material_id": 1, "quantity": 1, "loss_rate": 0},
                {"material_id": material_id, "quantity": 2, "loss_rate": 0.1},
            ]
        },
    )
    assert replaced.status_code == 200
    body = replaced.json()
    assert len(body["items"]) == 2
    assert float(body["total_material_cost"]) == 20.0


@pytest.mark.anyio
@pytest.mark.parametrize(
    "url,payload,expected",
    [
        ("/api/products", {"sku": "BAD", "name": "bad", "item_type": "unknown", "unit": "件", "cost_price": 0, "sale_price": 0}, 400),
        ("/api/products/2/materials", {"items": [{"material_id": 1, "quantity": 1}, {"material_id": 1, "quantity": 2}]}, 400),
        ("/api/products/2/materials", {"items": [{"material_id": 99999, "quantity": 1}]}, 400),
        ("/api/products/2/materials", {"items": [{"material_id": 2, "quantity": 1}]}, 400),
        ("/api/products/2/materials", {"items": [{"material_id": 1, "quantity": 0}]}, 400),
        ("/api/products/1/materials", {"items": []}, 400),
    ],
)
async def test_product_service_validation_paths(url, payload, expected, client):
    method = client.post if url == "/api/products" else client.put
    resp = await method(url, json=payload)
    assert resp.status_code == expected


@pytest.mark.anyio
async def test_create_product_from_task_creates_and_binds_product(client):
    resp = await client.post("/api/products/from-task/task-demo-1")
    assert resp.status_code == 201
    body = resp.json()
    assert body["sku"] == "MI1"
    assert body["name"] == "demo-mold"
    assert body["category"] == "模具成品"
    assert body["item_type"] == "finished"
    assert body["min_stock"] == 0
    assert body["max_stock"] == 0
    assert "由模具分析创建" in body["description"]

    again = await client.post("/api/products/from-task/task-demo-1")
    assert again.status_code == 201
    assert again.json()["id"] == body["id"]


@pytest.mark.anyio
@pytest.mark.parametrize(
    "task_id,expected",
    [("missing-task", 404)],
)
async def test_create_product_from_task_validation(task_id, expected, client):
    resp = await client.post(f"/api/products/from-task/{task_id}")
    assert resp.status_code == expected