"""Tests for l1_session_service start_* functions (T12)."""
import uuid
import pytest
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.account import Account
from app.models.user import User
from app.models.tree import Tree
from app.models.ai_session import AISession
from app.models.flow_proposal import FlowProposal
from app.services.l1_session_service import (
    start_flow_session,
    start_proposal_session,
    start_adhoc_session,
    _resolve_acting_as,
)


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

async def _make_account(db: AsyncSession) -> Account:
    s = str(uuid.uuid4())[:8]
    account = Account(
        id=uuid.uuid4(),
        name=f"Test Account {s}",
        display_code=s[:8].upper(),
    )
    db.add(account)
    await db.flush()
    return account


async def _make_user(
    db: AsyncSession,
    *,
    account_id: uuid.UUID,
    account_role: str = "l1_tech",
    can_cover_l1: bool = False,
) -> User:
    user = User(
        id=uuid.uuid4(),
        email=f"user-{uuid.uuid4()}@example.com",
        name="Test User",
        account_id=account_id,
        account_role=account_role,
        role="engineer",
        is_active=True,
        can_cover_l1=can_cover_l1,
    )
    db.add(user)
    await db.flush()
    return user


async def _make_tree(db: AsyncSession, *, account_id: uuid.UUID, author_id: uuid.UUID) -> Tree:
    tree = Tree(
        id=uuid.uuid4(),
        name="Test Flow",
        account_id=account_id,
        author_id=author_id,
        tree_type="troubleshooting",
        tree_structure={"nodes": [], "edges": []},
        visibility="team",
        status="published",
    )
    db.add(tree)
    await db.flush()
    return tree


async def _make_ai_session(db: AsyncSession, *, user_id: uuid.UUID, account_id: uuid.UUID) -> AISession:
    ai_session = AISession(
        id=uuid.uuid4(),
        user_id=user_id,
        account_id=account_id,
        session_type="chat",
        intake_type="free_text",
        intake_content={"text": "test"},
        status="active",
        confidence_tier="discovery",
        conversation_messages=[],
    )
    db.add(ai_session)
    await db.flush()
    return ai_session


async def _make_proposal(
    db: AsyncSession,
    *,
    account_id: uuid.UUID,
    source_session_id: uuid.UUID,
) -> FlowProposal:
    proposal = FlowProposal(
        id=uuid.uuid4(),
        account_id=account_id,
        source_session_id=source_session_id,
        proposal_type="new_flow",
        title="Test Proposal",
        proposed_flow_data={"nodes": [], "edges": []},
        source="manual_draft",
        status="pending",
    )
    db.add(proposal)
    await db.flush()
    return proposal


# ---------------------------------------------------------------------------
# Unit tests for _resolve_acting_as (no DB needed)
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_resolve_acting_as_for_engineer_returns_coverage_tag():
    user = User(account_role="engineer")
    assert _resolve_acting_as(user) == "l1_coverage"


@pytest.mark.asyncio
async def test_resolve_acting_as_for_l1_tech_returns_none():
    user = User(account_role="l1_tech")
    assert _resolve_acting_as(user) is None


@pytest.mark.asyncio
async def test_resolve_acting_as_for_owner_returns_none():
    user = User(account_role="owner")
    assert _resolve_acting_as(user) is None


# ---------------------------------------------------------------------------
# Integration tests (real DB)
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_start_flow_session_creates_active_flow_session(test_db: AsyncSession):
    account = await _make_account(test_db)
    l1 = await _make_user(test_db, account_id=account.id)
    tree = await _make_tree(test_db, account_id=account.id, author_id=l1.id)

    session = await start_flow_session(
        test_db,
        account_id=account.id,
        user=l1,
        flow_id=tree.id,
        ticket_id="ticket-abc",
        ticket_kind="internal",
    )
    assert session.session_kind == "flow"
    assert session.flow_id == tree.id
    assert session.flow_proposal_id is None
    assert session.status == "active"
    assert session.walked_path == []
    assert session.walk_notes == []
    assert session.acting_as is None  # l1_tech native
    assert session.ticket_id == "ticket-abc"
    assert session.ticket_kind == "internal"


@pytest.mark.asyncio
async def test_start_proposal_session_creates_active_proposal_session(test_db: AsyncSession):
    account = await _make_account(test_db)
    l1 = await _make_user(test_db, account_id=account.id)
    ai_session = await _make_ai_session(test_db, user_id=l1.id, account_id=account.id)
    proposal = await _make_proposal(
        test_db,
        account_id=account.id,
        source_session_id=ai_session.id,
    )

    session = await start_proposal_session(
        test_db,
        account_id=account.id,
        user=l1,
        flow_proposal_id=proposal.id,
        ticket_id="ticket-xyz",
        ticket_kind="psa",
    )
    assert session.session_kind == "proposal"
    assert session.flow_proposal_id == proposal.id
    assert session.flow_id is None
    assert session.status == "active"


@pytest.mark.asyncio
async def test_start_adhoc_session_no_flow_no_proposal(test_db: AsyncSession):
    account = await _make_account(test_db)
    l1 = await _make_user(test_db, account_id=account.id)
    session = await start_adhoc_session(
        test_db,
        account_id=account.id,
        user=l1,
        ticket_id="ticket-adhoc",
        ticket_kind="internal",
    )
    assert session.session_kind == "adhoc"
    assert session.flow_id is None
    assert session.flow_proposal_id is None
    assert session.walked_path == []
    assert session.walk_notes == []


@pytest.mark.asyncio
async def test_engineer_with_coverage_gets_acting_as_tag(test_db: AsyncSession):
    account = await _make_account(test_db)
    eng = await _make_user(
        test_db,
        account_id=account.id,
        account_role="engineer",
        can_cover_l1=True,
    )
    session = await start_adhoc_session(
        test_db,
        account_id=account.id,
        user=eng,
        ticket_id="t",
        ticket_kind="internal",
    )
    assert session.acting_as == "l1_coverage"