"""Unit tests for TaskService gateway-backfill methods.

These cover the methods the Choreographer calls into; full end-to-end
behavior is exercised by the gateway tests. Each test mocks the DB
session boundary and checks the method's contract.
"""

from __future__ import annotations

from datetime import datetime
from unittest.mock import AsyncMock, MagicMock
from uuid import uuid4

import pytest
from roboco.models.base import (
    AgentRole,
    AgentStatus,
    BlockerResolverType,
    TaskStatus,
    Team,
)
from roboco.services.task import GatewayAgentView, TaskService


def _build_task(**overrides: object) -> MagicMock:
    base: dict[str, object] = {
        "id": uuid4(),
        "status": TaskStatus.PENDING,
        "branch_name": "feature/backend/abc12345",
        "assigned_to": None,
        "claimed_by": None,
        "claimed_at": None,
        "plan": None,
        "qa_evidence_inspected": False,
        "pre_block_state": None,
        "pre_block_assignee": None,
        "pre_block_metadata": None,
        "blocker_resolver_type": None,
        "blocker_raised_by": None,
        "commits": [],
        "dev_notes": None,
    }
    base.update(overrides)
    return MagicMock(**base)


def _service_with(execute_returns: object) -> TaskService:
    """Build a TaskService whose session.execute returns `execute_returns`."""
    session = MagicMock()
    session.execute = AsyncMock(return_value=execute_returns)
    session.flush = AsyncMock()
    return TaskService(session)


def _bind(svc: TaskService, name: str, value: object) -> None:
    """Stub `name` on `svc` without tripping mypy's method-assign check."""
    object.__setattr__(svc, name, value)


# ---------------------------------------------------------------------------
# Aliases / thin wrappers
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_list_blocked_for_team_filters_by_team() -> None:
    svc = TaskService(MagicMock())
    list_blocked_mock = AsyncMock(return_value=[MagicMock(id="t1")])
    _bind(svc, "list_blocked", list_blocked_mock)
    out = await svc.list_blocked_for_team(Team.BACKEND)
    list_blocked_mock.assert_awaited_once_with(team=Team.BACKEND)
    assert len(out) == 1


@pytest.mark.asyncio
async def test_list_blocked_all_teams_passes_no_team() -> None:
    svc = TaskService(MagicMock())
    list_blocked_mock = AsyncMock(return_value=[])
    _bind(svc, "list_blocked", list_blocked_mock)
    await svc.list_blocked_all_teams()
    list_blocked_mock.assert_awaited_once_with()


@pytest.mark.asyncio
async def test_list_awaiting_pm_review_for_team_passes_team() -> None:
    svc = TaskService(MagicMock())
    list_pm_mock = AsyncMock(return_value=[])
    _bind(svc, "list_awaiting_pm_review", list_pm_mock)
    await svc.list_awaiting_pm_review_for_team(Team.FRONTEND)
    list_pm_mock.assert_awaited_once_with(team=Team.FRONTEND)


@pytest.mark.asyncio
async def test_submit_verification_records_progress_when_notes_given() -> None:
    svc = TaskService(MagicMock())
    add_progress_mock = AsyncMock()
    submit_for_verification_mock = AsyncMock(return_value=MagicMock())
    _bind(svc, "add_progress", add_progress_mock)
    _bind(svc, "submit_for_verification", submit_for_verification_mock)
    agent_id = uuid4()
    task_id = uuid4()
    await svc.submit_verification(agent_id, task_id, "implemented login")
    add_progress_mock.assert_awaited_once_with(task_id, agent_id, "implemented login")
    submit_for_verification_mock.assert_awaited_once_with(
        task_id, agent_role="developer"
    )


@pytest.mark.asyncio
async def test_submit_verification_skips_progress_when_notes_empty() -> None:
    svc = TaskService(MagicMock())
    add_progress_mock = AsyncMock()
    _bind(svc, "add_progress", add_progress_mock)
    _bind(svc, "submit_for_verification", AsyncMock(return_value=MagicMock()))
    await svc.submit_verification(uuid4(), uuid4(), "")
    add_progress_mock.assert_not_called()


@pytest.mark.asyncio
async def test_submit_qa_records_progress_when_notes_given() -> None:
    svc = TaskService(MagicMock())
    add_progress_mock = AsyncMock()
    submit_for_qa_mock = AsyncMock(return_value=MagicMock())
    _bind(svc, "add_progress", add_progress_mock)
    _bind(svc, "submit_for_qa", submit_for_qa_mock)
    agent_id = uuid4()
    task_id = uuid4()
    await svc.submit_qa(agent_id, task_id, "ready for review")
    add_progress_mock.assert_awaited_once()
    submit_for_qa_mock.assert_awaited_once_with(task_id, agent_role="developer")


# ---------------------------------------------------------------------------
# list_assigned_for_agent
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_list_assigned_for_agent_returns_active_tasks() -> None:
    expected_tasks = [MagicMock(id="t1"), MagicMock(id="t2")]
    scalars = MagicMock()
    scalars.all.return_value = expected_tasks
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    out = await svc.list_assigned_for_agent(uuid4())
    assert out == expected_tasks


# ---------------------------------------------------------------------------
# agent_for
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_agent_for_returns_view_with_role_team_skills(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    fake_agent = MagicMock(
        id=uuid4(), slug="be-pm", role=AgentRole.CELL_PM, team=Team.BACKEND
    )
    result = MagicMock()
    result.scalar_one_or_none.return_value = fake_agent
    svc = _service_with(result)

    monkeypatch.setattr(
        "roboco.agents_config.get_escalation_target", lambda _slug: "main_pm"
    )
    monkeypatch.setattr(
        "roboco.agents_config.get_agent_skills",
        lambda _slug: [{"id": "task_management"}],
    )
    view = await svc.agent_for(uuid4())
    assert isinstance(view, GatewayAgentView)
    assert view.role == "cell_pm"
    assert view.team == "backend"
    assert view.escalation_target == "main_pm"
    assert view.skills == [{"id": "task_management"}]


@pytest.mark.asyncio
async def test_agent_for_returns_none_when_missing() -> None:
    result = MagicMock()
    result.scalar_one_or_none.return_value = None
    svc = _service_with(result)
    assert await svc.agent_for(uuid4()) is None


# ---------------------------------------------------------------------------
# qa/documenter/cell_pm for_team
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_qa_agent_for_team_finds_qa() -> None:
    qa = MagicMock(id=uuid4(), role=AgentRole.QA, team=Team.BACKEND)
    scalars = MagicMock()
    scalars.first.return_value = qa
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    out = await svc.qa_agent_for_team(Team.BACKEND)
    assert out is qa


@pytest.mark.asyncio
async def test_documenter_for_team_returns_none_when_missing() -> None:
    scalars = MagicMock()
    scalars.first.return_value = None
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    assert await svc.documenter_for_team(Team.BACKEND) is None


@pytest.mark.asyncio
async def test_cell_pm_for_team_finds_pm() -> None:
    pm = MagicMock(id=uuid4(), role=AgentRole.CELL_PM, team=Team.UX_UI)
    scalars = MagicMock()
    scalars.first.return_value = pm
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    assert await svc.cell_pm_for_team(Team.UX_UI) is pm


# ---------------------------------------------------------------------------
# get_active_task_for_agent + list_paused_for_agent
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_get_active_task_for_agent_returns_top_task() -> None:
    task = MagicMock(id=uuid4(), status=TaskStatus.IN_PROGRESS)
    result = MagicMock()
    result.scalar_one_or_none.return_value = task
    svc = _service_with(result)
    assert await svc.get_active_task_for_agent(uuid4()) is task


@pytest.mark.asyncio
async def test_list_paused_for_agent_returns_paused_tasks() -> None:
    paused = [MagicMock(id=uuid4(), status=TaskStatus.PAUSED)]
    scalars = MagicMock()
    scalars.all.return_value = paused
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    out = await svc.list_paused_for_agent(uuid4())
    assert out == paused


# ---------------------------------------------------------------------------
# list_awaiting_main_pm_all
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_list_awaiting_main_pm_all_returns_root_tasks() -> None:
    roots = [MagicMock(id=uuid4(), parent_task_id=None)]
    scalars = MagicMock()
    scalars.all.return_value = roots
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    out = await svc.list_awaiting_main_pm_all()
    assert out == roots


# ---------------------------------------------------------------------------
# all_subtasks_terminal
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_all_subtasks_terminal_true_when_all_completed() -> None:
    scalars = MagicMock()
    scalars.all.return_value = [TaskStatus.COMPLETED, TaskStatus.CANCELLED]
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    assert await svc.all_subtasks_terminal(uuid4()) is True


@pytest.mark.asyncio
async def test_all_subtasks_terminal_false_when_one_active() -> None:
    scalars = MagicMock()
    scalars.all.return_value = [TaskStatus.COMPLETED, TaskStatus.IN_PROGRESS]
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    assert await svc.all_subtasks_terminal(uuid4()) is False


@pytest.mark.asyncio
async def test_all_subtasks_terminal_true_when_no_subtasks() -> None:
    scalars = MagicMock()
    scalars.all.return_value = []
    result = MagicMock()
    result.scalars.return_value = scalars
    svc = _service_with(result)
    assert await svc.all_subtasks_terminal(uuid4()) is True


# ---------------------------------------------------------------------------
# set_plan
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_set_plan_wraps_string_into_text_dict() -> None:
    task = _build_task()
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.set_plan(task.id, "do the thing")
    assert task.plan == {"text": "do the thing"}
    assert out is task


@pytest.mark.asyncio
async def test_set_plan_passes_dict_through() -> None:
    task = _build_task()
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.set_plan(task.id, {"steps": ["a", "b"]})
    assert task.plan == {"steps": ["a", "b"]}
    assert out is task


@pytest.mark.asyncio
async def test_set_plan_returns_none_when_task_missing() -> None:
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=None))
    assert await svc.set_plan(uuid4(), "plan") is None


# ---------------------------------------------------------------------------
# mark_evidence_inspected + mark_agent_idle
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_mark_evidence_inspected_sets_flag() -> None:
    task = _build_task(qa_evidence_inspected=False)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    await svc.mark_evidence_inspected(task.id)
    assert task.qa_evidence_inspected is True


@pytest.mark.asyncio
async def test_mark_evidence_inspected_no_op_on_missing_task() -> None:
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=None))
    await svc.mark_evidence_inspected(uuid4())  # must not raise


@pytest.mark.asyncio
async def test_reassign_sets_assigned_to_and_claimed_by() -> None:
    task = _build_task(assigned_to=None, claimed_by=None)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    new_assignee = uuid4()
    out = await svc.reassign(task.id, new_assignee)
    assert out is task
    assert task.assigned_to == new_assignee
    assert task.claimed_by == new_assignee


@pytest.mark.asyncio
async def test_reassign_clears_assignment_when_none() -> None:
    prev = uuid4()
    task = _build_task(assigned_to=prev, claimed_by=prev)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.reassign(task.id, None)
    assert out is task
    assert task.assigned_to is None
    assert task.claimed_by is None


@pytest.mark.asyncio
async def test_reassign_returns_none_when_task_missing() -> None:
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=None))
    out = await svc.reassign(uuid4(), uuid4())
    assert out is None


@pytest.mark.asyncio
async def test_mark_agent_idle_sets_status_idle() -> None:
    agent = MagicMock(id=uuid4(), status=AgentStatus.ACTIVE)
    result = MagicMock()
    result.scalar_one_or_none.return_value = agent
    svc = _service_with(result)
    await svc.mark_agent_idle(agent.id)
    assert agent.status == AgentStatus.IDLE


# ---------------------------------------------------------------------------
# qa_claim / doc_claim
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_qa_claim_sets_assignment_on_awaiting_qa() -> None:
    task = _build_task(status=TaskStatus.AWAITING_QA)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    qa_id = uuid4()
    out = await svc.qa_claim(qa_id, task.id)
    assert out is task
    assert task.assigned_to == qa_id
    assert task.claimed_by == qa_id
    assert isinstance(task.claimed_at, datetime)


@pytest.mark.asyncio
async def test_qa_claim_rejects_wrong_status() -> None:
    task = _build_task(status=TaskStatus.IN_PROGRESS)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.qa_claim(uuid4(), task.id)
    assert out is None


@pytest.mark.asyncio
async def test_doc_claim_sets_assignment_on_awaiting_documentation() -> None:
    task = _build_task(status=TaskStatus.AWAITING_DOCUMENTATION)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    doc_id = uuid4()
    out = await svc.doc_claim(doc_id, task.id)
    assert out is task
    assert task.assigned_to == doc_id


# ---------------------------------------------------------------------------
# qa_pass / qa_fail
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_qa_pass_delegates_to_pass_qa() -> None:
    qa_id = uuid4()
    task_id = uuid4()
    task = _build_task(id=task_id, claimed_by=qa_id)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    pass_qa_mock = AsyncMock(return_value=MagicMock())
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "pass_qa", pass_qa_mock)
    await svc.qa_pass(qa_id, task_id, "looks good")
    pass_qa_mock.assert_awaited_once_with(task_id, notes="looks good", agent_role="qa")
    # active_claimant_id cleared so the documenter can claim cleanly.
    assert task.active_claimant_id is None


@pytest.mark.asyncio
async def test_qa_fail_appends_issues_to_dev_notes() -> None:
    qa_id = uuid4()
    task = _build_task(dev_notes=None, claimed_by=qa_id)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    fail_qa_mock = AsyncMock(return_value=task)
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "fail_qa", fail_qa_mock)
    issues = ["missing test", "no docstring"]
    await svc.qa_fail(qa_id, task.id, "blocking", issues)
    assert task.dev_notes is not None
    assert "missing test" in task.dev_notes
    assert "no docstring" in task.dev_notes
    fail_qa_mock.assert_awaited_once_with(task.id, notes="blocking", agent_role="qa")
    assert task.active_claimant_id is None


# ---------------------------------------------------------------------------
# unblock_with_restore
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_unblock_with_restore_returns_to_pre_block_state() -> None:
    pre_assignee = uuid4()
    task = _build_task(
        status=TaskStatus.BLOCKED,
        pre_block_state="in_progress",
        pre_block_assignee=pre_assignee,
        pre_block_metadata={"foo": "bar"},
        blocker_resolver_type=BlockerResolverType.AGENT,
        blocker_raised_by=pre_assignee,
    )
    svc = TaskService(MagicMock(flush=AsyncMock()))
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.unblock_with_restore(uuid4(), task.id, restore=True)
    assert out is task
    assert task.status == TaskStatus.IN_PROGRESS
    assert task.assigned_to == pre_assignee
    assert task.pre_block_state is None
    assert task.pre_block_assignee is None


@pytest.mark.asyncio
async def test_unblock_with_restore_falls_through_when_no_snapshot() -> None:
    task = _build_task(status=TaskStatus.BLOCKED, pre_block_state=None)
    svc = TaskService(MagicMock(flush=AsyncMock()))
    unblock_mock = AsyncMock(return_value=task)
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "unblock", unblock_mock)
    out = await svc.unblock_with_restore(uuid4(), task.id, restore=True)
    unblock_mock.assert_awaited_once()
    assert out is task


@pytest.mark.asyncio
async def test_unblock_with_restore_calls_legacy_unblock_when_restore_false() -> None:
    task = _build_task(
        status=TaskStatus.BLOCKED, pre_block_state=TaskStatus.IN_PROGRESS.value
    )
    svc = TaskService(MagicMock(flush=AsyncMock()))
    unblock_mock = AsyncMock(return_value=task)
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "unblock", unblock_mock)
    await svc.unblock_with_restore(uuid4(), task.id, restore=False)
    unblock_mock.assert_awaited_once()


# ---------------------------------------------------------------------------
# cell_pm_complete
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_cell_pm_complete_appends_merge_commit() -> None:
    task = _build_task(commits=[{"hash": "old", "message": "earlier"}])
    svc = TaskService(MagicMock(flush=AsyncMock()))
    complete_mock = AsyncMock(return_value=task)
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "complete", complete_mock)
    pm_id = uuid4()
    await svc.cell_pm_complete(pm_id, task.id, "all good", merge_commit="deadbeef")
    assert task.commits[-1]["hash"] == "deadbeef"
    assert task.commits[-1]["kind"] == "merge"
    complete_mock.assert_awaited_once_with(task.id, agent_id=pm_id)


@pytest.mark.asyncio
async def test_cell_pm_complete_skips_merge_when_none() -> None:
    task = _build_task(commits=[])
    svc = TaskService(MagicMock(flush=AsyncMock()))
    complete_mock = AsyncMock(return_value=task)
    _bind(svc, "get", AsyncMock(return_value=task))
    _bind(svc, "complete", complete_mock)
    await svc.cell_pm_complete(uuid4(), task.id, "all good", merge_commit=None)
    assert task.commits == []


# ---------------------------------------------------------------------------
# escalate / escalate_up_to_role
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_escalate_returns_none_when_no_target_configured(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    task = _build_task()
    agent = MagicMock(id=uuid4(), slug="lone-agent")
    agent_result = MagicMock()
    agent_result.scalar_one_or_none.return_value = agent

    session = MagicMock()
    session.execute = AsyncMock(return_value=agent_result)
    session.flush = AsyncMock()
    svc = TaskService(session)
    _bind(svc, "get", AsyncMock(return_value=task))
    monkeypatch.setattr(
        "roboco.agents_config.get_escalation_target", lambda _slug: None
    )
    out = await svc.escalate(uuid4(), task.id, "stuck")
    assert out is None


@pytest.mark.asyncio
async def test_escalate_up_to_role_returns_none_for_unknown_role() -> None:
    task = _build_task()
    agent = MagicMock(id=uuid4(), slug="some-agent")
    agent_result = MagicMock()
    agent_result.scalar_one_or_none.return_value = agent

    session = MagicMock()
    session.execute = AsyncMock(return_value=agent_result)
    svc = TaskService(session)
    _bind(svc, "get", AsyncMock(return_value=task))
    out = await svc.escalate_up_to_role(uuid4(), task.id, "bogus_role", "reason")
    assert out is None
