"""A descendant executable task is never assigned to a board/advisory role.

The main_pm -> product_owner escalation rung used to hand an in_progress child
code task to the Product Owner and mark it BLOCKED. The board has no verb to
claim/build/complete cell-executed work, so the dev's finished work deadlocked.
The guard covers every CELL-executed task type — code, documentation, AND
design — because a board role has no verb to own any of them. The shared write
primitive ``TaskService.apply_escalation`` now diverts such an escalation: the
task is released to PENDING for a role-matched cell claim instead of being
stranded on a board role.
"""

from __future__ import annotations

import asyncio
from unittest.mock import AsyncMock, MagicMock, patch
from uuid import uuid4

import pytest
from roboco.models.base import AgentRole, TaskStatus, TaskType, Team
from roboco.services.task import (
    TaskService,
    _is_cell_team_task,
    _is_descendant_executable_task,
)


def _bind(svc: TaskService, name: str, value: object) -> None:
    object.__setattr__(svc, name, value)


def _service() -> TaskService:
    session = MagicMock()
    session.flush = AsyncMock()
    return TaskService(session)


# ---------------------------------------------------------------------------
# _is_descendant_executable_task (pure)
# ---------------------------------------------------------------------------


def test_descendant_code_task_is_flagged() -> None:
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.CODE)
    assert _is_descendant_executable_task(task) is True


def test_descendant_cell_team_task_is_flagged() -> None:
    # A cell's own coordination task carries a cell team but a non-executable
    # type; it must still not be handed to a board role on escalation.
    task = MagicMock(
        parent_task_id=uuid4(), team=Team.FRONTEND, task_type=TaskType.PLANNING
    )
    assert _is_cell_team_task(task) is True


def test_root_cell_team_task_is_not_flagged() -> None:
    # A root task can legitimately escalate up the chain (the CEO reviews it).
    task = MagicMock(parent_task_id=None, team=Team.FRONTEND)
    assert _is_cell_team_task(task) is False


def test_non_cell_team_task_is_not_flagged() -> None:
    task = MagicMock(parent_task_id=uuid4(), team=Team.BOARD)
    assert _is_cell_team_task(task) is False


def test_descendant_documentation_task_is_flagged() -> None:
    # Documentation is cell-executed (documenter), not board work.
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.DOCUMENTATION)
    assert _is_descendant_executable_task(task) is True


def test_descendant_design_task_is_flagged() -> None:
    # Design is cell-executed (UX/design cell), not board work.
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.DESIGN)
    assert _is_descendant_executable_task(task) is True


def test_root_code_task_is_not_descendant() -> None:
    # A root task can legitimately escalate up the chain (the CEO reviews it).
    task = MagicMock(parent_task_id=None, task_type=TaskType.CODE)
    assert _is_descendant_executable_task(task) is False


def test_root_documentation_task_is_not_descendant() -> None:
    # Roots are reviewed up the chain regardless of (executable) type.
    task = MagicMock(parent_task_id=None, task_type=TaskType.DOCUMENTATION)
    assert _is_descendant_executable_task(task) is False


def test_descendant_planning_task_is_not_executable() -> None:
    # PLANNING routes to a PM, not a cell agent — not diverted by the guard.
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.PLANNING)
    assert _is_descendant_executable_task(task) is False


def test_descendant_research_task_is_not_executable() -> None:
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.RESEARCH)
    assert _is_descendant_executable_task(task) is False


def test_descendant_administrative_task_is_not_executable() -> None:
    task = MagicMock(parent_task_id=uuid4(), task_type=TaskType.ADMINISTRATIVE)
    assert _is_descendant_executable_task(task) is False


def test_code_task_type_as_raw_string_is_flagged() -> None:
    # Detached/partially-hydrated rows may surface task_type as a raw string.
    task = MagicMock(parent_task_id=uuid4(), task_type="code")
    assert _is_descendant_executable_task(task) is True


def test_documentation_task_type_as_raw_string_is_flagged() -> None:
    task = MagicMock(parent_task_id=uuid4(), task_type="documentation")
    assert _is_descendant_executable_task(task) is True


# ---------------------------------------------------------------------------
# apply_escalation board-role divert
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_apply_escalation_diverts_descendant_code_to_board() -> None:
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="main-pm",
        target_slug="product-owner",
        reason="please review",
    )

    # Diverted to the pool release — NOT blocked, NOT reassigned to the board.
    release_mock.assert_awaited_once()
    assert task.status == TaskStatus.IN_PROGRESS  # untouched by the guard branch
    assert task.assigned_to != target_id


@pytest.mark.asyncio
async def test_apply_escalation_diverts_descendant_documentation_to_board() -> None:
    # A descendant DOCUMENTATION task escalated to a board role is diverted too
    # — the board has no verb to write/complete docs either.
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.DOCUMENTATION,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="main-pm",
        target_slug="head-marketing",
        reason="please review docs",
    )

    release_mock.assert_awaited_once()
    assert task.status == TaskStatus.IN_PROGRESS  # untouched by the guard branch
    assert task.assigned_to != target_id


@pytest.mark.asyncio
async def test_apply_escalation_diverts_descendant_design_to_board() -> None:
    # A descendant DESIGN task escalated to a board role is diverted.
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.DESIGN,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="ux-pm",
        target_slug="product-owner",
        reason="please review design",
    )

    release_mock.assert_awaited_once()
    assert task.status == TaskStatus.IN_PROGRESS
    assert task.assigned_to != target_id


@pytest.mark.asyncio
async def test_apply_escalation_blocks_descendant_planning_to_board() -> None:
    # PLANNING is NOT a cell-executed type — the guard does not divert it even to
    # a board target, so it follows the normal block+reassign path.
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.PLANNING,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        dev_notes=None,
        status=TaskStatus.IN_PROGRESS,
    )
    board_check = AsyncMock(return_value=True)
    _bind(svc, "_is_board_advisory_agent", board_check)
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="main-pm",
        target_slug="product-owner",
        reason="planning review",
    )

    release_mock.assert_not_called()
    assert task.status == TaskStatus.BLOCKED
    assert task.assigned_to == target_id


@pytest.mark.asyncio
async def test_apply_escalation_proceeds_for_non_board_target() -> None:
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        dev_notes=None,
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=False))
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="be-pm",
        target_slug="main-pm",
        reason="cell blocked",
    )

    # Normal escalation: blocked + reassigned to the (non-board) target.
    release_mock.assert_not_called()
    assert task.status == TaskStatus.BLOCKED
    assert task.assigned_to == target_id


@pytest.mark.asyncio
async def test_apply_escalation_blocks_root_code_task_to_board_target() -> None:
    # A ROOT code task is not a descendant — the guard does not fire even when
    # the target is a board role (the CEO/board reviews roots legitimately).
    svc = _service()
    target_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=None,
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        blocker_raised_by=None,
        dev_notes=None,
        status=TaskStatus.IN_PROGRESS,
    )
    board_check = AsyncMock(return_value=True)
    _bind(svc, "_is_board_advisory_agent", board_check)
    release_mock = AsyncMock()
    _bind(svc, "_release_code_task_to_pool", release_mock)

    await svc.apply_escalation(
        task=task,
        target_agent_id=target_id,
        escalator_slug="main-pm",
        target_slug="product-owner",
        reason="root review",
    )

    # Guard short-circuits on _is_descendant_executable_task BEFORE the board
    # check, so a root task escalates normally.
    board_check.assert_not_called()
    release_mock.assert_not_called()
    assert task.status == TaskStatus.BLOCKED
    assert task.assigned_to == target_id


@pytest.mark.asyncio
async def test_release_code_task_to_pool_sets_pending_and_clears_assignee() -> None:
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        active_claimant_id=uuid4(),
        dev_notes="prior",
        status=TaskStatus.IN_PROGRESS,
    )
    await svc._release_code_task_to_pool(
        task=task,
        escalator_slug="main-pm",
        blocked_target_slug="product-owner",
        reason="cannot own code",
    )
    assert task.status == TaskStatus.PENDING
    assert task.assigned_to is None
    assert task.claimed_by is None
    assert task.active_claimant_id is None
    assert "ESCALATION REDIRECTED" in task.dev_notes


@pytest.mark.asyncio
async def test_is_board_advisory_agent_classifies_roles() -> None:
    for role, expected in [
        (AgentRole.PRODUCT_OWNER, True),
        (AgentRole.HEAD_MARKETING, True),
        (AgentRole.AUDITOR, True),
        (AgentRole.MAIN_PM, False),
        (AgentRole.CELL_PM, False),
        (AgentRole.DEVELOPER, False),
    ]:
        session = MagicMock()
        result = MagicMock()
        result.scalar_one_or_none = MagicMock(return_value=role)
        session.execute = AsyncMock(return_value=result)
        svc = TaskService(session)
        assert await svc._is_board_advisory_agent(uuid4()) is expected


@pytest.mark.asyncio
async def test_apply_escalation_emits_blocked_audit_event() -> None:
    """A non-divert escalation sets BLOCKED and MUST record a task.blocked audit
    row. The escalate path sets status directly (bypassing the validated
    transition), and used to skip the audit log entirely."""
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.PLANNING,  # not cell-executed → never diverted
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        blocker_raised_by=None,
        dev_notes="",
        team=Team.BACKEND,
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=False))
    audit_mock = MagicMock(log_task_event=AsyncMock())

    with patch("roboco.services.audit.get_audit_service", return_value=audit_mock):
        await svc.apply_escalation(
            task=task,
            target_agent_id=uuid4(),
            escalator_slug="be-pm",
            target_slug="main-pm",
            reason="needs a decision",
        )
        # Drain the fire-and-forget audit task so the assertion sees the call.
        pending = list(svc._background_tasks)
        if pending:
            await asyncio.gather(*pending, return_exceptions=True)

    assert task.status == TaskStatus.BLOCKED
    audit_mock.log_task_event.assert_awaited_once()
    kwargs = audit_mock.log_task_event.await_args.kwargs
    assert kwargs["event_type"] == "task.blocked"
    assert kwargs["details"]["from_status"] == "in_progress"
    assert kwargs["details"]["to_status"] == "blocked"


@pytest.mark.asyncio
async def test_unblock_with_restore_emits_audit_event() -> None:
    """The PM restore path sets status directly (bypassing the validated
    transition) and used to skip the audit log; it must record the transition."""
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        status=TaskStatus.BLOCKED,
        pre_block_state="in_progress",
        pre_block_assignee=None,
        claimed_by=uuid4(),
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    audit_mock = MagicMock(log_task_event=AsyncMock())

    with patch("roboco.services.audit.get_audit_service", return_value=audit_mock):
        await svc.unblock_with_restore(uuid4(), uuid4(), restore=True)
        pending = list(svc._background_tasks)
        if pending:
            await asyncio.gather(*pending, return_exceptions=True)

    assert task.status == TaskStatus.IN_PROGRESS
    audit_mock.log_task_event.assert_awaited_once()
    kwargs = audit_mock.log_task_event.await_args.kwargs
    assert kwargs["event_type"] == "task.in_progress"
    assert kwargs["details"]["from_status"] == "blocked"
    assert kwargs["details"]["to_status"] == "in_progress"


# ---------------------------------------------------------------------------
# reassign / reassign_active_claim board-role divert — same invariant at the
# direct reassign setters, not just the escalate path
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_reassign_diverts_cell_task_to_board_role() -> None:
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        active_claimant_id=uuid4(),
        dev_notes="prior",
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))

    out = await svc.reassign(task.id, uuid4())

    assert out is task
    assert task.status == TaskStatus.PENDING
    assert task.assigned_to is None
    assert task.claimed_by is None
    assert task.active_claimant_id is None
    assert "REASSIGN REDIRECTED" in task.dev_notes


@pytest.mark.asyncio
async def test_reassign_assigns_non_board_target_normally() -> None:
    svc = _service()
    new_assignee = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=False))

    out = await svc.reassign(task.id, new_assignee)

    assert out is task
    assert task.assigned_to == new_assignee
    assert task.claimed_by == new_assignee
    assert task.status == TaskStatus.IN_PROGRESS  # status untouched by a handoff


@pytest.mark.asyncio
async def test_reassign_none_clears_without_consulting_board_check() -> None:
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    board_check = AsyncMock(return_value=True)
    _bind(svc, "_is_board_advisory_agent", board_check)

    out = await svc.reassign(task.id, None)

    # new_assignee=None short-circuits the guard (clearing assignment is the
    # documented "escalated to CEO, acts via UI" path).
    board_check.assert_not_called()
    assert out is task
    assert task.assigned_to is None
    assert task.claimed_by is None


@pytest.mark.asyncio
async def test_reassign_active_claim_diverts_cell_task_to_board_role() -> None:
    svc = _service()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        active_claimant_id=uuid4(),
        dev_notes="prior",
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))

    out = await svc.reassign_active_claim(task.id, uuid4())

    assert out is task
    assert task.status == TaskStatus.PENDING
    assert task.assigned_to is None
    assert "REASSIGN REDIRECTED" in task.dev_notes


@pytest.mark.asyncio
async def test_reassign_active_claim_assigns_non_board_target_normally() -> None:
    svc = _service()
    new_assignee = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
        active_claimant_id=uuid4(),
        status=TaskStatus.IN_PROGRESS,
    )
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=False))

    out = await svc.reassign_active_claim(task.id, new_assignee)

    assert out is task
    assert task.assigned_to == new_assignee
    assert task.claimed_by == new_assignee
    assert task.active_claimant_id == new_assignee


# ---------------------------------------------------------------------------
# _unblock_dependents revival re-home — a dependency clearing must not revive a
# cell task under a board/advisory or absent owner
# ---------------------------------------------------------------------------


def _blocked_dependent(task: MagicMock) -> AsyncMock:
    """A session.execute that yields ``task`` as the only dependency-blocked row."""
    result = MagicMock()
    result.scalars.return_value.all.return_value = [task]
    return AsyncMock(return_value=result)


@pytest.mark.asyncio
async def test_unblock_dependents_rehomes_board_owned_cell_task() -> None:
    svc = _service()
    completed_id = uuid4()
    board_owner = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        dependency_ids=[completed_id],
        status=TaskStatus.BLOCKED,
        assigned_to=board_owner,
        claimed_by=board_owner,
        active_claimant_id=board_owner,
        dev_notes="prior",
    )
    object.__setattr__(svc.session, "execute", _blocked_dependent(task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))

    await svc._unblock_dependents(completed_id)

    assert task.dependency_ids == []
    assert task.status == TaskStatus.PENDING
    assert task.assigned_to is None
    assert task.claimed_by is None
    assert "REVIVAL REDIRECTED" in task.dev_notes


@pytest.mark.asyncio
async def test_unblock_dependents_rehomes_ownerless_cell_task() -> None:
    svc = _service()
    completed_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        dependency_ids=[completed_id],
        status=TaskStatus.BLOCKED,
        assigned_to=None,
        claimed_by=None,
        active_claimant_id=None,
        dev_notes="",
    )
    object.__setattr__(svc.session, "execute", _blocked_dependent(task))
    board_check = AsyncMock(return_value=False)
    _bind(svc, "_is_board_advisory_agent", board_check)

    await svc._unblock_dependents(completed_id)

    # owner is None → needs_rehome short-circuits True without the board check.
    board_check.assert_not_called()
    assert task.status == TaskStatus.PENDING
    assert "REVIVAL REDIRECTED" in task.dev_notes


@pytest.mark.asyncio
async def test_unblock_dependents_resumes_dev_owned_cell_task() -> None:
    svc = _service()
    completed_id = uuid4()
    dev_owner = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=uuid4(),
        task_type=TaskType.CODE,
        dependency_ids=[completed_id],
        status=TaskStatus.BLOCKED,
        assigned_to=dev_owner,
        claimed_by=dev_owner,
    )
    object.__setattr__(svc.session, "execute", _blocked_dependent(task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=False))
    validate_mock = MagicMock()
    _bind(svc, "_validate_and_set_status", validate_mock)

    await svc._unblock_dependents(completed_id)

    # Workable owner → resume in place, owner preserved (not cleared).
    validate_mock.assert_called_once()
    assert validate_mock.call_args.args[1] == TaskStatus.IN_PROGRESS
    assert task.assigned_to == dev_owner


@pytest.mark.asyncio
async def test_unblock_dependents_resumes_board_owned_root_task() -> None:
    # A ROOT task legitimately owned by a board role (e.g. a product root the PO
    # reviews) must resume in place — the cell guard targets descendants only.
    svc = _service()
    completed_id = uuid4()
    task = MagicMock(
        id=uuid4(),
        parent_task_id=None,
        task_type=TaskType.CODE,
        team=Team.BOARD,
        dependency_ids=[completed_id],
        status=TaskStatus.BLOCKED,
        assigned_to=uuid4(),
        claimed_by=uuid4(),
    )
    object.__setattr__(svc.session, "execute", _blocked_dependent(task))
    _bind(svc, "_is_board_advisory_agent", AsyncMock(return_value=True))
    validate_mock = MagicMock()
    _bind(svc, "_validate_and_set_status", validate_mock)

    await svc._unblock_dependents(completed_id)

    validate_mock.assert_called_once()
    assert validate_mock.call_args.args[1] == TaskStatus.IN_PROGRESS