from __future__ import annotations

from collections.abc import Generator

from fastapi.testclient import TestClient
from sqlalchemy import create_engine, select
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy.pool import StaticPool

from app.api.deps import get_db
from app.core.agent_enums import AgentAssetDomain
from app.db.base import Base
from app.main import create_app
from app.models.agent_asset import AgentAsset, AgentAssetRuleFeedback
from app.schemas.agent_asset import (
    AgentAssetRiskRuleFeedbackCreate,
    AgentAssetRiskRuleGenerateRequest,
)
from app.services.agent_asset_rule_library import AgentAssetRuleLibraryManager
from app.services.agent_assets import AgentAssetService
from app.services.risk_rule_generation import RiskRuleGenerationService


class NullRuntimeChatService:
    def complete(self, *args, **kwargs) -> None:
        return None


def build_session() -> Session:
    engine = create_engine(
        "sqlite+pysqlite:///:memory:",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(bind=engine)
    return sessionmaker(bind=engine, autoflush=False, autocommit=False)()


def build_client() -> tuple[TestClient, sessionmaker[Session]]:
    engine = create_engine(
        "sqlite+pysqlite:///:memory:",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(bind=engine)
    session_factory = sessionmaker(bind=engine, autoflush=False, autocommit=False)
    app = create_app()

    def override_db() -> Generator[Session, None, None]:
        db = session_factory()
        try:
            yield db
        finally:
            db.close()

    app.dependency_overrides[get_db] = override_db
    return TestClient(app), session_factory


def test_risk_rule_feedback_records_misjudgement_without_modifying_rule(tmp_path) -> None:
    with build_session() as db:
        asset_id = _create_rule(db, tmp_path)
        asset = db.get(AgentAsset, asset_id)
        assert asset is not None
        before_config = dict(asset.config_json or {})
        before_status = asset.status

        feedback = AgentAssetService(db).create_risk_rule_feedback(
            asset_id,
            AgentAssetRiskRuleFeedbackCreate(
                feedback_type="false_positive",
                subject_type="expense_claim",
                subject_key="CLAIM-001",
                subject_label="差旅报销 CLAIM-001",
                actual_result={"hit": True, "severity": "high"},
                expected_result={"hit": False},
                comment="票据城市实际与行程一致，当前规则误判。",
                payload={"source": "expense_review"},
            ),
            actor="employee",
        )

        stored = db.scalar(
            select(AgentAssetRuleFeedback).where(
                AgentAssetRuleFeedback.feedback_id == feedback.feedback_id
            )
        )
        assert stored is not None
        assert feedback.feedback_type == "false_positive"
        assert feedback.version == asset.working_version
        assert stored.actual_result_json["hit"] is True
        db.refresh(asset)
        assert asset.status == before_status
        assert asset.config_json == before_config


def test_risk_rule_feedback_endpoint_allows_ordinary_user_and_manager_list(tmp_path) -> None:
    client, session_factory = build_client()
    with session_factory() as db:
        asset_id = _create_rule(db, tmp_path)

    response = client.post(
        f"/api/v1/agent-assets/{asset_id}/risk-rules/feedback",
        headers=_user_headers(),
        json={
            "feedback_type": "false_negative",
            "subject_type": "expense_claim",
            "subject_key": "CLAIM-002",
            "actual_result": {"hit": False},
            "expected_result": {"hit": True, "severity": "medium"},
            "comment": "这张票据应命中风险但没有命中。",
        },
    )

    assert response.status_code == 201
    assert response.json()["created_by"] == "employee"
    assert response.json()["status"] == "open"

    list_response = client.get(
        f"/api/v1/agent-assets/{asset_id}/risk-rules/feedback",
        headers=_manager_headers(),
    )
    assert list_response.status_code == 200
    assert list_response.json()[0]["feedback_type"] == "false_negative"


def _create_rule(db: Session, tmp_path) -> str:
    return RiskRuleGenerationService(
        db,
        rule_library_manager=AgentAssetRuleLibraryManager(rule_root=tmp_path / "rules"),
        runtime_chat_service=NullRuntimeChatService(),
    ).generate_rule_asset(
        AgentAssetRiskRuleGenerateRequest(
            business_domain=AgentAssetDomain.EXPENSE,
            expense_category="travel",
            rule_title="差旅票据城市规则",
            natural_language="差旅票据城市与申报目的地不一致时，提示补充说明。",
        ),
        actor="pytest",
    )


def _user_headers() -> dict[str, str]:
    return {
        "x-auth-username": "employee",
        "x-auth-name": "employee",
        "x-auth-role-codes": "user",
    }


def _manager_headers() -> dict[str, str]:
    return {
        "x-auth-username": "manager",
        "x-auth-name": "manager",
        "x-auth-role-codes": "manager",
    }