"""Tests for the Phase 2A L1 AI-build API surface.

Covers intake dispatch (match_or_build outcomes), the next-node endpoint, and
the engineer escalations list. The orchestrator and node generator are mocked —
this exercises the endpoint wiring, not the AI.
"""
import uuid
from unittest.mock import AsyncMock, patch

import pytest
from httpx import AsyncClient
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.security import create_access_token, get_password_hash
from app.models.account import Account
from app.models.user import User


async def _seed_user(test_db: AsyncSession, *, account_role="l1_tech"):
    account = Account(name="L1 Co", display_code=f"L1{uuid.uuid4().hex[:6].upper()}")
    test_db.add(account)
    await test_db.flush()
    user = User(
        account_id=account.id,
        email=f"l1-{uuid.uuid4().hex[:8]}@example.com",
        hashed_password=get_password_hash("pw"),
        full_name="L1 Tech",
        account_role=account_role,
        is_active=True,
        is_verified=True,
    )
    test_db.add(user)
    await test_db.flush()
    return account, user


def _auth(user: User) -> dict:
    return {"Authorization": f"Bearer {create_access_token(subject=str(user.id))}"}


@pytest.mark.asyncio
async def test_intake_build_outcome_creates_ai_build_session(
    client: AsyncClient, test_db: AsyncSession
):
    """intake → match_or_build returns 'build' → an ai_build session is created."""
    account, user = await _seed_user(test_db)
    with patch(
        "app.api.endpoints.l1.match_or_build.match_or_build",
        new=AsyncMock(return_value={"outcome": "build", "session_kind": "ai_build",
                                    "category": "printer"}),
    ):
        r = await client.post(
            "/api/v1/l1/intake",
            json={"problem_statement": "printer jam"},
            headers=_auth(user),
        )
    assert r.status_code == 200
    body = r.json()
    assert body["outcome"] == "build"
    assert body["session_kind"] == "ai_build"
    assert body["session_id"]


@pytest.mark.asyncio
async def test_intake_out_of_scope(client: AsyncClient, test_db: AsyncSession):
    """intake → 'out_of_scope' → no session, surfaced to the caller."""
    account, user = await _seed_user(test_db)
    with patch(
        "app.api.endpoints.l1.match_or_build.match_or_build",
        new=AsyncMock(return_value={"outcome": "out_of_scope", "category": "unknown"}),
    ):
        r = await client.post(
            "/api/v1/l1/intake",
            json={"problem_statement": "weird thing"},
            headers=_auth(user),
        )
    assert r.status_code == 200
    body = r.json()
    assert body["outcome"] == "out_of_scope"
    assert body["session_id"] is None


@pytest.mark.asyncio
async def test_intake_suggest_returns_near_miss(client: AsyncClient, test_db: AsyncSession):
    """intake → 'suggest' → near_miss prompt, no session."""
    account, user = await _seed_user(test_db)
    near = {"flow_id": str(uuid.uuid4()), "flow_name": "VPN", "score": 0.66}
    with patch(
        "app.api.endpoints.l1.match_or_build.match_or_build",
        new=AsyncMock(return_value={"outcome": "suggest", "near_miss": near, "can_build": True}),
    ):
        r = await client.post(
            "/api/v1/l1/intake",
            json={"problem_statement": "vpn"},
            headers=_auth(user),
        )
    assert r.status_code == 200
    body = r.json()
    assert body["outcome"] == "suggest"
    assert body["near_miss"]["flow_name"] == "VPN"


@pytest.mark.asyncio
async def test_next_node_returns_generated_node(client: AsyncClient, test_db: AsyncSession):
    """After a build intake, /next-node returns the node from advance_ai_build."""
    account, user = await _seed_user(test_db)
    with patch(
        "app.api.endpoints.l1.match_or_build.match_or_build",
        new=AsyncMock(return_value={"outcome": "build", "session_kind": "ai_build",
                                    "category": "printer"}),
    ):
        r = await client.post(
            "/api/v1/l1/intake",
            json={"problem_statement": "printer jam"},
            headers=_auth(user),
        )
    sid = r.json()["session_id"]
    with patch(
        "app.api.endpoints.l1.l1_session_service.advance_ai_build",
        new=AsyncMock(return_value={"node_type": "question", "id": "n1", "text": "Powered on?"}),
    ):
        r2 = await client.post(
            f"/api/v1/l1/sessions/{sid}/next-node",
            json={},
            headers=_auth(user),
        )
    assert r2.status_code == 200
    assert r2.json()["node"]["node_type"] == "question"


@pytest.mark.asyncio
async def test_escalations_lists_escalated_sessions_for_engineer(
    client: AsyncClient, test_db: AsyncSession
):
    """GET /l1/escalations returns escalated L1 sessions; requires engineer-or-above."""
    from datetime import datetime, timezone
    from app.models.l1_walk_session import L1WalkSession

    account, engineer = await _seed_user(test_db, account_role="engineer")
    now = datetime.now(timezone.utc)
    sess = L1WalkSession(
        account_id=account.id,
        created_by_user_id=engineer.id,
        ticket_id="t-esc",
        ticket_kind="internal",
        session_kind="ai_build",
        status="escalated",
        started_at=now,
        last_step_at=now,
        escalated_at=now,
    )
    test_db.add(sess)
    await test_db.flush()

    r = await client.get("/api/v1/l1/escalations", headers=_auth(engineer))
    assert r.status_code == 200
    rows = r.json()
    assert any(row["id"] == str(sess.id) for row in rows)


@pytest.mark.asyncio
async def test_escalations_forbidden_for_l1_tech(client: AsyncClient, test_db: AsyncSession):
    """An l1_tech (not engineer-or-above) is rejected from the escalations queue."""
    account, l1 = await _seed_user(test_db, account_role="l1_tech")
    r = await client.get("/api/v1/l1/escalations", headers=_auth(l1))
    assert r.status_code == 403