from __future__ import annotations

from collections.abc import Generator

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

from app.api.deps import CurrentUserContext, get_db
from app.db.base import Base
from app.main import create_app
from app.schemas.notification_state import NotificationStateBatchPatch, NotificationStatePatch
from app.services.notification_states import NotificationStateService


def build_session() -> 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)
    return session_factory()


def build_client() -> TestClient:
    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)


def test_notification_state_service_persists_user_scoped_read_and_hidden_state() -> None:
    with build_session() as db:
        service = NotificationStateService(db)
        user = CurrentUserContext(username="alice", name="Alice", role_codes=[], is_admin=False)
        other_user = CurrentUserContext(username="bob", name="Bob", role_codes=[], is_admin=False)

        saved = service.patch_states(
            NotificationStateBatchPatch(
                states=[
                    NotificationStatePatch(
                        notification_id="document:owned:EXP-001",
                        read=True,
                        hidden=True,
                        context_json={"kind": "document"},
                    )
                ]
            ),
            user,
        )
        other_saved = service.patch_states(
            NotificationStateBatchPatch(
                states=[
                    NotificationStatePatch(
                        notification_id="document:owned:EXP-001",
                        read=True,
                    )
                ]
            ),
            other_user,
        )

        assert len(saved.states) == 1
        assert saved.states[0].notification_id == "document:owned:EXP-001"
        assert saved.states[0].read_at is not None
        assert saved.states[0].hidden_at is not None
        assert saved.states[0].context_json["kind"] == "document"
        assert other_saved.states[0].hidden_at is None


def test_notification_state_storage_ready_runs_once_per_database_bind(monkeypatch) -> None:
    with build_session() as db:
        service = NotificationStateService(db)
        user = CurrentUserContext(username="alice", name="Alice", role_codes=[], is_admin=False)
        calls: list[object] = []
        original_create_all = Base.metadata.create_all

        def track_create_all(*args, **kwargs):
            calls.append(kwargs.get("bind"))
            return original_create_all(*args, **kwargs)

        monkeypatch.setattr(Base.metadata, "create_all", track_create_all)

        service.list_states(user)
        service.list_states(user)
        service.patch_states(
            NotificationStateBatchPatch(
                states=[NotificationStatePatch(notification_id="workbench:todo:EXP-002", read=True)]
            ),
            user,
        )

        assert len(calls) == 1


def test_notification_state_endpoint_reads_and_updates_current_user_state() -> None:
    client = build_client()
    headers = {"x-auth-username": "alice", "x-auth-name": "Alice"}

    post_response = client.post(
        "/api/v1/notification-states",
        json={
            "states": [
                {
                    "notification_id": "workbench:todo:EXP-002",
                    "read": True,
                    "hidden": False,
                    "context_json": {"kind": "workbench"},
                }
            ]
        },
        headers=headers,
    )
    get_response = client.get("/api/v1/notification-states", headers=headers)
    other_response = client.get(
        "/api/v1/notification-states",
        headers={"x-auth-username": "bob", "x-auth-name": "Bob"},
    )

    assert post_response.status_code == 200
    assert get_response.status_code == 200
    payload = get_response.json()
    assert payload["states"][0]["notification_id"] == "workbench:todo:EXP-002"
    assert payload["states"][0]["read_at"] is not None
    assert payload["states"][0]["hidden_at"] is None
    assert payload["states"][0]["context_json"]["kind"] == "workbench"
    assert other_response.json()["states"] == []


def test_notification_state_endpoint_accepts_document_center_bulk_read_state() -> None:
    client = build_client()
    headers = {"x-auth-username": "alice", "x-auth-name": "Alice"}
    states = [
        {
            "notification_id": f"document:owned:DOC-{index}",
            "read": True,
            "hidden": False,
            "context_json": {"kind": "document", "target_type": "documents-center"},
        }
        for index in range(150)
    ]

    response = client.post(
        "/api/v1/notification-states",
        json={"states": states},
        headers=headers,
    )

    assert response.status_code == 200
    payload = response.json()
    assert len(payload["states"]) == 150
    assert all(item["read_at"] for item in payload["states"])