import threading

import pytest
from sqlalchemy import delete, func, select

from app.core.db import SessionLocal, engine
from app.models.audit import AuditEvent
from app.models.vehicle import Vehicle
from app.seed_loader import reset_and_seed
from app.services.audit import record_audit_event


def test_unauthenticated_dashboard_is_rejected(client):
    response = client.get("/api/v1/dashboard")
    assert response.status_code == 401
    assert response.json()["error"]["code"] == "401"


def test_oidc_status_is_disabled_without_configuration(client):
    assert client.get("/api/v1/auth/oidc/status").json() == {
        "enabled": False,
        "provider_name": None,
    }
    assert client.get("/api/v1/auth/oidc/login").status_code == 404


def test_oidc_callback_auto_provisions_and_logs_in(client, monkeypatch):
    import app.api.routers.auth as auth_router

    class FakeClient:
        async def authorize_access_token(self, _request):
            return {
                "userinfo": {
                    "sub": "external-subject-1",
                    "email": "oidc.user@example.test",
                    "email_verified": True,
                    "name": "OIDC User",
                }
            }

    class FakeOAuth:
        def create_client(self, _name):
            return FakeClient()

    monkeypatch.setattr(auth_router.settings, "oidc_enabled", True)
    monkeypatch.setattr(auth_router.settings, "oidc_issuer_url", "https://id.example.test")
    monkeypatch.setattr(auth_router.settings, "oidc_client_id", "client")
    monkeypatch.setattr(auth_router.settings, "oidc_client_secret", "secret")
    monkeypatch.setattr(auth_router.settings, "oidc_allowed_email_domains", "example.test")
    monkeypatch.setattr(auth_router, "oauth", FakeOAuth())

    response = client.get("/api/v1/auth/oidc/callback", follow_redirects=False)
    assert response.status_code == 307
    assert response.headers["location"].endswith("/dashboard")
    session = client.get("/api/v1/auth/session")
    assert session.status_code == 200
    assert session.json()["display_name"] == "OIDC User"
    assert session.json()["role"] == "rental_employee"


def test_oidc_callback_rejects_missing_email_verification_claim(client, monkeypatch):
    import app.api.routers.auth as auth_router

    class FakeClient:
        async def authorize_access_token(self, _request):
            return {"userinfo": {"sub": "unverified-subject", "email": "new@example.test"}}

    class FakeOAuth:
        def create_client(self, _name):
            return FakeClient()

    monkeypatch.setattr(auth_router.settings, "oidc_enabled", True)
    monkeypatch.setattr(auth_router.settings, "oidc_issuer_url", "https://id.example.test")
    monkeypatch.setattr(auth_router.settings, "oidc_client_id", "client")
    monkeypatch.setattr(auth_router.settings, "oidc_client_secret", "secret")
    monkeypatch.setattr(auth_router.settings, "oidc_allowed_email_domains", "example.test")
    monkeypatch.setattr(auth_router, "oauth", FakeOAuth())

    response = client.get("/api/v1/auth/oidc/callback", follow_redirects=False)
    assert response.status_code == 401
    assert client.get("/api/v1/auth/session").status_code == 401


def test_demo_login_grants_access(ops_client):
    response = ops_client.get("/api/v1/dashboard")
    assert response.status_code == 200


def test_rental_employee_cannot_reset_demo(employee_client):
    response = employee_client.post("/api/v1/demo/reset")
    assert response.status_code == 403


def test_operations_manager_can_reset_demo(ops_client):
    response = ops_client.post("/api/v1/demo/reset")
    assert response.status_code == 200
    body = response.json()
    assert body["counts"]["vehicles"] == 50
    assert body["anchor_date"]
    assert body["seeded_at"]
    assert body["scenario_integrity"]["all_ready"] is True
    assert body["scenario_integrity"]["not_ready"] == []


def test_demo_reset_rejects_concurrent_rebuild(ops_client):
    import app.api.routers.demo as demo_router

    assert demo_router._reset_guard.acquire(blocking=False)
    try:
        response = ops_client.post("/api/v1/demo/reset")
    finally:
        demo_router._reset_guard.release()
    assert response.status_code == 409


def test_demo_reset_database_lock_blocks_another_api_replica(ops_client):
    import app.api.routers.demo as demo_router

    # Use a raw connection: an ordinary Session intentionally participates in the
    # shared mutation barrier and would make an exclusive reset wait before it can test
    # this separate non-blocking replica lock.
    with engine.connect() as lock_connection:
        lock_connection.scalar(select(func.pg_advisory_lock(demo_router._RESET_ADVISORY_LOCK_ID)))
        try:
            response = ops_client.post("/api/v1/demo/reset")
        finally:
            lock_connection.scalar(
                select(func.pg_advisory_unlock(demo_router._RESET_ADVISORY_LOCK_ID))
            )
    assert response.status_code == 409


def test_demo_reset_waits_for_active_mutation_and_then_replaces_it_atomically():
    started = threading.Event()
    completed = threading.Event()
    errors: list[BaseException] = []

    def reset_in_other_session() -> None:
        started.set()
        try:
            with SessionLocal() as reset_db:
                reset_and_seed(reset_db)
        except BaseException as exc:  # pragma: no cover - assertion reports thread failures
            errors.append(exc)
        finally:
            completed.set()

    with SessionLocal() as mutation_db:
        vehicle = mutation_db.scalar(
            select(Vehicle).where(Vehicle.public_ref == "MO-001").with_for_update()
        )
        vehicle.location = "Concurrent mutation marker"
        mutation_db.flush()
        worker = threading.Thread(target=reset_in_other_session, daemon=True)
        worker.start()
        assert started.wait(timeout=1)
        assert not completed.wait(timeout=0.2)
        mutation_db.commit()

    worker.join(timeout=10)
    assert not worker.is_alive(), "reset deadlocked behind the active mutation"
    assert errors == []
    with SessionLocal() as db:
        restored = db.scalar(select(Vehicle).where(Vehicle.public_ref == "MO-001"))
        assert restored.location != "Concurrent mutation marker"


def test_demo_reset_cooldown_returns_retry_after(ops_client, monkeypatch):
    import app.api.routers.demo as demo_router

    monkeypatch.setattr(demo_router.settings, "demo_reset_cooldown_seconds", 60)
    with SessionLocal() as db:
        cooldown_event = record_audit_event(
            db,
            actor_type="user",
            actor_label="Cooldown test",
            action="demo_reset",
            entity_type="system",
        )
        db.commit()
        cooldown_event_id = cooldown_event.id
    response = ops_client.post("/api/v1/demo/reset")
    assert response.status_code == 429
    assert int(response.headers["retry-after"]) >= 1
    with SessionLocal() as db:
        db.execute(delete(AuditEvent).where(AuditEvent.id == cooldown_event_id))
        db.commit()


def test_demo_reset_rolls_back_every_change_when_integrity_check_fails(ops_client, monkeypatch):
    import app.api.routers.demo as demo_router

    monkeypatch.setattr(demo_router.settings, "demo_reset_cooldown_seconds", 0)
    with SessionLocal() as db:
        probe = record_audit_event(
            db,
            actor_type="system",
            actor_label="Atomic reset test",
            action="reset_atomicity_probe",
            entity_type="system",
        )
        db.commit()
        probe_id = probe.id

    def fail_integrity_check(_db):
        raise RuntimeError("Injected integrity-check failure")

    monkeypatch.setattr(demo_router, "scenario_integrity_report", fail_integrity_check)
    with pytest.raises(RuntimeError, match="Injected integrity-check failure"):
        ops_client.post("/api/v1/demo/reset")

    with SessionLocal() as db:
        assert db.scalar(select(AuditEvent).where(AuditEvent.id == probe_id)) is not None
        db.execute(delete(AuditEvent).where(AuditEvent.id == probe_id))
        db.commit()


def test_reset_is_rejected_when_demo_allow_reset_is_disabled(ops_client, monkeypatch):
    import app.api.routers.demo as demo_router

    monkeypatch.setattr(demo_router.settings, "demo_allow_reset", False)
    response = ops_client.post("/api/v1/demo/reset")
    assert response.status_code == 403

    # Restore real demo data: this test intentionally disabled reset, so a following test
    # module must not inherit a database left mid-mutation by an earlier test.
    monkeypatch.setattr(demo_router.settings, "demo_allow_reset", True)
    assert ops_client.post("/api/v1/demo/reset").status_code == 200


def test_session_endpoint_requires_authentication(client):
    response = client.get("/api/v1/demo/session")
    assert response.status_code == 401


def test_session_endpoint_confirms_logged_in_user(ops_client):
    response = ops_client.get("/api/v1/demo/session")
    assert response.status_code == 200
    body = response.json()
    assert body["role"] == "operations_manager"
    assert body["public_ref"] == "USR-OPS"


def test_logout_invalidates_session(ops_client):
    confirmed = ops_client.get("/api/v1/demo/session")
    assert confirmed.status_code == 200

    logout = ops_client.post("/api/v1/demo/logout")
    assert logout.status_code == 200

    after = ops_client.get("/api/v1/demo/session")
    assert after.status_code == 401


def test_logout_rejects_a_cookie_even_if_the_browser_retains_it(ops_client):
    from app.core.config import get_settings

    cookie_name = get_settings().session_cookie_name
    stolen_token = ops_client.cookies.get(cookie_name)
    assert stolen_token

    logout = ops_client.post("/api/v1/auth/logout")
    assert logout.status_code == 200

    # Simulate the browser cookie race (or a copied cookie): server-side revocation is
    # authoritative and must reject the original signed token independently of deletion.
    ops_client.cookies.set(cookie_name, stolen_token)
    assert ops_client.get("/api/v1/auth/session").status_code == 401

    # Remove the deliberately injected hostless cookie before exercising a normal browser
    # login. Otherwise httpx sends it alongside the real testserver cookie, which is not a
    # state a browser can create for the same origin/path pair.
    ops_client.cookies.clear()

    # A fresh login in the same second receives a distinct signed token and remains valid.
    fresh_login = ops_client.post("/api/v1/demo/login", json={"role": "operations_manager"})
    assert fresh_login.status_code == 200
    assert ops_client.get("/api/v1/auth/session").status_code == 200


def test_logout_without_a_session_is_safe(client):
    response = client.post("/api/v1/demo/logout")
    assert response.status_code == 200


def test_demo_reset_preserves_integration_telemetry(ops_client, client):
    from app.core.config import get_settings

    settings = get_settings()
    probe = client.get(
        "/api/v1/integrations/mcp/operations-summary",
        headers={
            "X-Service-Token": settings.mcp_hub_service_token,
            "X-Client-Id": "itworx-mcp-hub:mobilityops:reset-probe",
        },
    )
    assert probe.status_code == 200
    assert ops_client.post("/api/v1/demo/reset").status_code == 200

    assert client.post("/api/v1/demo/login", json={"role": "operations_manager"}).status_code == 200
    events = client.get("/api/v1/audit", params={"action": "mcp_tool_request"}).json()
    assert any(
        event["actor_label"] == "itworx-mcp-hub"
        and event["metadata"].get("reported_client_id", "").endswith(":reset-probe")
        for event in events
    )