"""资产导出 / 导入的往返一致性测试

export_assets 自称「用于数据迁移/备份」，那它导出的字段就必须在 import_assets
里真的落库。external_id 是 sync_service 的去重键 (provider_id, external_id, asset_type)，
AssetCreate/AssetUpdate 不收这个字段——导入时若被 pydantic 静默丢弃，
迁移后首次同步会把所有云端资产当成新增再建一份，台账直接翻倍。

运行：.venv/bin/pytest tests/test_asset_export_import.py -v
"""

import pytest
from sqlmodel import Session, SQLModel, create_engine, select

import app.models.asset  # noqa: F401
import app.models.credential  # noqa: F401
import app.models.monitor  # noqa: F401
import app.models.provider  # noqa: F401
import app.models.ssl  # noqa: F401
from app.models.asset import Asset, AssetType, DomainDetail, VPSDetail
from app.services.asset_service import export_assets, import_assets


@pytest.fixture()
def engine(tmp_path, monkeypatch):
    eng = create_engine(
        f"sqlite:///{tmp_path / 'assets.db'}", connect_args={"check_same_thread": False}
    )
    SQLModel.metadata.create_all(eng)
    # _cleanup_metrics_for_asset 在函数内部取 metrics_engine，指到临时库避免污染本地 data/
    monkeypatch.setattr("app.database.metrics_engine", eng)
    yield eng
    eng.dispose()


def _seed_vps(engine, name="web-01", external_id="i-abc123"):
    with Session(engine) as s:
        a = Asset(
            name=name, asset_type=AssetType.VPS, provider="vultr",
            external_id=external_id, cost=5.0, currency="USD",
        )
        s.add(a)
        s.commit()
        s.refresh(a)
        s.add(VPSDetail(asset_id=a.id, ip_address="1.2.3.4"))
        s.commit()
        return a.id


def _seed_domain(engine, name="example.com", external_id="example.com"):
    with Session(engine) as s:
        a = Asset(name=name, asset_type=AssetType.DOMAIN, provider="namesilo", external_id=external_id)
        s.add(a)
        s.commit()
        s.refresh(a)
        s.add(DomainDetail(asset_id=a.id, domain_name=name))
        s.commit()
        return a.id


def _external_ids(engine):
    with Session(engine) as s:
        return {a.name: a.external_id for a in s.exec(select(Asset)).all()}


def _wipe(engine):
    """清空资产与详情行

    必须连详情一起删：SQLite 默认不强制外键，只删 Asset 会留下孤儿详情行；
    而 assets.id 是 INTEGER PRIMARY KEY（无 AUTOINCREMENT），删掉后新建资产
    必然复用同一个 id，撞上孤儿行的 UNIQUE(asset_id)。
    """
    with Session(engine) as s:
        for model in (VPSDetail, DomainDetail):
            for row in s.exec(select(model)).all():
                s.delete(row)
        for a in s.exec(select(Asset)).all():
            s.delete(a)
        s.commit()


# ----------------------------- 导出 ----------------------------- #
def test_export_includes_external_id(engine):
    _seed_vps(engine)
    with Session(engine) as s:
        data = export_assets(s)
    assert data["count"] == 1
    assert data["assets"][0]["external_id"] == "i-abc123"


def test_export_carries_detail_and_count(engine):
    _seed_vps(engine)
    _seed_domain(engine)
    with Session(engine) as s:
        data = export_assets(s)
    assert data["count"] == 2
    by_name = {a["name"]: a for a in data["assets"]}
    assert by_name["web-01"]["vps_detail"]["ip_address"] == "1.2.3.4"
    assert by_name["example.com"]["domain_detail"]["domain_name"] == "example.com"


# ----------------------------- 导入落库 ----------------------------- #
def test_import_creates_asset_with_external_id(engine):
    """空库导入：external_id 必须落到行上，不能被 AssetCreate 静默吞掉"""
    _seed_vps(engine)
    with Session(engine) as s:
        payload = export_assets(s)["assets"]
    _wipe(engine)
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["errors"] == []
    assert result["created"] == 1
    assert _external_ids(engine)["web-01"] == "i-abc123"


def test_import_updates_existing_and_keeps_external_id(engine):
    """同名同类型同平台 -> 走更新分支，external_id 不能丢"""
    asset_id = _seed_vps(engine)
    with Session(engine) as s:
        payload = export_assets(s)["assets"]
    with Session(engine) as s:
        a = s.get(Asset, asset_id)
        a.external_id = None  # 模拟历史数据没有 external_id
        s.add(a)
        s.commit()
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["updated"] == 1 and result["created"] == 0
    assert _external_ids(engine)["web-01"] == "i-abc123"


def test_import_does_not_clobber_a_fresher_external_id(engine):
    """已有值时不覆盖：导入包可能比线上同步到的旧，覆盖会让去重键指向已销毁的实例"""
    asset_id = _seed_vps(engine, external_id="i-old")
    with Session(engine) as s:
        payload = export_assets(s)["assets"]
    with Session(engine) as s:
        a = s.get(Asset, asset_id)
        a.external_id = "i-new"
        s.add(a)
        s.commit()
    with Session(engine) as s:
        import_assets(s, payload)
    assert _external_ids(engine)["web-01"] == "i-new"


def test_import_ignores_computed_fields(engine):
    """days_to_expiry / provider_name / account_name 是派生值，导入时必须跳过而不是写库"""
    _seed_vps(engine)
    with Session(engine) as s:
        payload = export_assets(s)["assets"]
    payload[0]["days_to_expiry"] = 999
    payload[0]["provider_name"] = "不存在的平台"
    payload[0]["account_name"] = "不存在的账号"
    _wipe(engine)
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["errors"] == []
    assert result["created"] == 1


def test_import_without_external_id_key_still_works(engine):
    """老导出包没有这个字段，不能因此报错"""
    payload = [{
        "name": "legacy", "asset_type": "vps", "provider": "vultr",
        "vps_detail": {"ip_address": "9.9.9.9"},
    }]
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["created"] == 1 and result["errors"] == []
    assert _external_ids(engine)["legacy"] is None


def test_import_all_or_nothing_on_failure(engine):
    """单事务语义：一条失败则整体回滚，不能留下半截数据"""
    _seed_vps(engine, name="good")
    payload = [
        {"name": "ok-1", "asset_type": "vps", "provider": "vultr",
         "external_id": "i-1", "vps_detail": {"ip_address": "1.1.1.1"}},
        {"name": "bad-1", "asset_type": "vps", "provider": "vultr"},  # 缺 vps_detail -> 400
    ]
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["created"] == 0 and result["updated"] == 0
    assert len(result["errors"]) == 1
    names = _external_ids(engine)
    assert "ok-1" not in names  # 成功那条也回滚了
    assert set(names) == {"good"}


def test_round_trip_preserves_everything(engine):
    """完整往返：导出 -> 清空 -> 导入，external_id 与详情都在"""
    _seed_vps(engine, name="web-01", external_id="i-111")
    _seed_domain(engine, name="example.com", external_id="example.com")
    with Session(engine) as s:
        payload = export_assets(s)["assets"]
    _wipe(engine)
    with Session(engine) as s:
        result = import_assets(s, payload)
    assert result["errors"] == [] and result["created"] == 2
    assert _external_ids(engine) == {"web-01": "i-111", "example.com": "example.com"}
    with Session(engine) as s:
        vps = s.exec(select(Asset).where(Asset.name == "web-01")).one()
        detail = s.exec(select(VPSDetail).where(VPSDetail.asset_id == vps.id)).one()
    assert detail.ip_address == "1.2.3.4"