"""API endpoint tests for session handoffs."""
from unittest.mock import AsyncMock, patch
from uuid import UUID as PyUUID

import pytest
from httpx import AsyncClient
from sqlalchemy import select

from app.api.endpoints.session_handoffs import stream_escalations
from app.core.escalation_bus import bus as escalation_bus
from app.models.ai_session import AISession
from app.models.session_handoff import SessionHandoff
from app.models.user import User
from app.services.handoff_manager import HandoffManager


class _ConnectedRequest:
    async def is_disconnected(self) -> bool:
        return False


@pytest.fixture(autouse=True)
def stub_ai_assessment():
    """Endpoint tests should not wait on the external AI assessment path."""
    with patch.object(
        HandoffManager,
        "_generate_handoff_summary",
        new=AsyncMock(
            return_value={
                "summary_prose": "Stub escalation assessment",
                "what_we_know": [],
                "likely_cause": "Stub",
                "suggested_steps": [],
                "confidence": "medium",
            }
        ),
    ):
        yield


@pytest.mark.asyncio
async def test_create_park_handoff_api(client: AsyncClient, test_user, auth_headers, test_db):
    """POST /ai-sessions/{id}/handoff with intent=park."""
    session = AISession(
        user_id=test_user["user_data"]["id"],
        account_id=test_user["user_data"]["account_id"],
        session_type="guided",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="active",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(session)
    await test_db.commit()

    resp = await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoff",
        headers=auth_headers,
        json={"intent": "park", "engineer_notes": "Waiting for logs"},
    )
    assert resp.status_code == 201
    data = resp.json()
    assert data["intent"] == "park"


@pytest.mark.asyncio
async def test_get_queue(client: AsyncClient, test_user, auth_headers, test_db):
    """GET /ai-sessions/queue returns unclaimed handoffs."""
    session = AISession(
        user_id=test_user["user_data"]["id"],
        account_id=test_user["user_data"]["account_id"],
        session_type="guided",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="active",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(session)
    await test_db.commit()

    # Create a handoff
    await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoff",
        headers=auth_headers,
        json={"intent": "escalate", "engineer_notes": "Need help"},
    )

    resp = await client.get("/api/v1/ai-sessions/queue", headers=auth_headers)
    assert resp.status_code == 200
    data = resp.json()
    assert len(data) >= 1


@pytest.mark.asyncio
async def test_claim_blocked_for_viewer_role(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """POST /handoffs/{id}/claim must 403 for viewer-role users.

    Codex review flagged the missing role gate as wedge-relevant: the
    race-condition story (two seniors clicking Pick Up simultaneously)
    requires auth gating for audit integrity. Viewers must not be able
    to claim escalations.
    """
    # Create a session + handoff as the engineer-role test_user (default = owner).
    session = AISession(
        user_id=test_user["user_data"]["id"],
        account_id=test_user["user_data"]["account_id"],
        session_type="guided",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="active",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(session)
    await test_db.commit()

    create_resp = await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoff",
        headers=auth_headers,
        json={"intent": "escalate", "engineer_notes": "Need help"},
    )
    assert create_resp.status_code == 201
    handoff_id = create_resp.json()["id"]

    # Downgrade the user to viewer.
    user_id = PyUUID(test_user["user_data"]["id"])
    user = (
        await test_db.execute(select(User).where(User.id == user_id))
    ).scalar_one()
    user.account_role = "viewer"
    await test_db.commit()

    claim_resp = await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoffs/{handoff_id}/claim",
        headers=auth_headers,
    )
    assert claim_resp.status_code == 403
    assert "engineer" in claim_resp.json()["detail"].lower()


@pytest.mark.asyncio
async def test_escalations_stream_blocked_for_viewer(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """SSE stream is role-gated to engineer-or-admin (matches queue/claim)."""
    user_id = PyUUID(test_user["user_data"]["id"])
    user = (
        await test_db.execute(select(User).where(User.id == user_id))
    ).scalar_one()
    user.account_role = "viewer"
    await test_db.commit()

    resp = await client.get(
        "/api/v1/ai-sessions/escalations/stream", headers=auth_headers
    )
    assert resp.status_code == 403


@pytest.mark.asyncio
async def test_escalations_stream_returns_sse_content_type(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """Engineer/owner can open the SSE stream and gets text/event-stream
    plus an initial `ready` event. Read just enough bytes to confirm the
    handshake — the full pub/sub flow is covered by the bus + dispatcher tests
    separately.

    Do not use `client.stream()` here: HTTPX's ASGITransport buffers the whole
    response body before returning, which hangs forever for an infinite SSE
    stream.
    """
    user_id = PyUUID(test_user["user_data"]["id"])
    user = (
        await test_db.execute(select(User).where(User.id == user_id))
    ).scalar_one()

    resp = await stream_escalations(_ConnectedRequest(), current_user=user)
    assert resp.media_type == "text/event-stream"

    body_iterator = resp.body_iterator
    try:
        first = await anext(body_iterator)
    finally:
        await body_iterator.aclose()

    assert "event: ready" in first
    assert '"account_id"' in first
    assert escalation_bus.subscriber_count(user.account_id) == 0


@pytest.mark.asyncio
async def test_claim_allowed_for_engineer_role(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """POST /handoffs/{id}/claim succeeds for engineer-or-admin roles."""
    original_engineer = User(
        email="original-engineer@example.com",
        password_hash="x",
        name="Original Engineer",
        role="engineer",
        account_id=test_user["user_data"]["account_id"],
        account_role="engineer",
    )
    test_db.add(original_engineer)
    await test_db.flush()

    session = AISession(
        user_id=original_engineer.id,
        account_id=test_user["user_data"]["account_id"],
        session_type="guided",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="active",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(session)
    await test_db.flush()

    handoff = SessionHandoff(
        session_id=session.id,
        account_id=test_user["user_data"]["account_id"],
        handed_off_by=original_engineer.id,
        intent="escalate",
        snapshot={"problem_summary": "test"},
        engineer_notes="Need help",
    )
    test_db.add(handoff)
    await test_db.commit()

    # Default test_user role is "owner", which passes engineer-or-admin.
    claim_resp = await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoffs/{handoff.id}/claim",
        headers=auth_headers,
    )
    assert claim_resp.status_code == 200
    assert claim_resp.json()["claimed_by"] == test_user["user_data"]["id"]
    assert claim_resp.json()["claimed_at"] is not None


@pytest.mark.asyncio
async def test_claim_rejects_self_claim(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """POST /handoffs/{id}/claim returns 403 for the original escalator."""
    session = AISession(
        user_id=test_user["user_data"]["id"],
        account_id=test_user["user_data"]["account_id"],
        session_type="guided",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="escalated",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(session)
    await test_db.flush()

    handoff = SessionHandoff(
        session_id=session.id,
        account_id=test_user["user_data"]["account_id"],
        handed_off_by=test_user["user_data"]["id"],
        intent="escalate",
        snapshot={"problem_summary": "test"},
        engineer_notes="Need help",
    )
    test_db.add(handoff)
    await test_db.commit()

    claim_resp = await client.post(
        f"/api/v1/ai-sessions/{session.id}/handoffs/{handoff.id}/claim",
        headers=auth_headers,
    )
    assert claim_resp.status_code == 403
    assert "own handoff" in claim_resp.json()["detail"]


@pytest.mark.asyncio
async def test_escalation_queue_excludes_own_escalations(
    client: AsyncClient, test_user, auth_headers, test_db
):
    """The post-escalation dashboard queue should not show your own handoff."""
    own_session = AISession(
        user_id=test_user["user_data"]["id"],
        account_id=test_user["user_data"]["account_id"],
        session_type="chat",
        intake_type="free_text",
        intake_content={"text": "own"},
        status="escalated",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    other_engineer = User(
        email="other-engineer@example.com",
        password_hash="x",
        name="Other Engineer",
        role="engineer",
        account_id=test_user["user_data"]["account_id"],
        account_role="engineer",
    )
    test_db.add_all([own_session, other_engineer])
    await test_db.flush()
    other_session = AISession(
        user_id=other_engineer.id,
        account_id=test_user["user_data"]["account_id"],
        session_type="chat",
        intake_type="free_text",
        intake_content={"text": "other"},
        status="escalated",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    test_db.add(other_session)
    await test_db.commit()

    resp = await client.get("/api/v1/ai-sessions/escalation-queue", headers=auth_headers)
    assert resp.status_code == 200
    ids = {item["id"] for item in resp.json()}
    assert str(own_session.id) not in ids
    assert str(other_session.id) in ids