"""Dispatch routing for blocked tasks (#17) and agentless claims (#19).

#17: a blocked task reassigned to Main PM must dispatch THAT assignee to
unblock it, not the ex-assignee cell PM — the pre-unblock note is assignee-only
and the ex-assignee got not_authorized, livelocking the respawn.

#19: a task left claimed/in_progress with an assignee but no running container
is invisibly stuck (only PENDING tasks get fresh dispatch). The orchestrator
must (re)spawn the assignee after a short grace window, or release the claim to
pending when the assignee is unknown.
"""

from __future__ import annotations

from datetime import UTC, datetime, timedelta
from typing import Any
from unittest.mock import AsyncMock, MagicMock, patch
from uuid import uuid4

import pytest
from roboco.models.runtime import AgentInstance
from roboco.runtime.orchestrator import AgentOrchestrator, AgentState
from roboco.seeds.initial_data import AGENT_UUIDS


def _orch() -> AgentOrchestrator:
    orch = object.__new__(AgentOrchestrator)
    orch._instances = {}
    return orch


def _active_instance(agent_id: str) -> AgentInstance:
    return AgentInstance(agent_id=agent_id, state=AgentState.ACTIVE)


# ---------------------------------------------------------------------------
# _blocker_resolver_slug (#17)
# ---------------------------------------------------------------------------


def test_blocked_task_assigned_to_main_pm_dispatches_main_pm() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "team": "backend",
        "assigned_to": AGENT_UUIDS["main-pm"],
    }
    # The current assignee (Main PM) holds unblock authority — dispatch THEM,
    # not the ex-assignee cell PM (be-pm), which would loop on not_authorized.
    assert orch._blocker_resolver_slug(task) == "main-pm"


def test_blocked_task_assigned_to_board_is_not_dispatched() -> None:
    # A board/advisory role (product-owner / head-marketing) has NO unblock
    # verb — dispatching it to resolve a blocker is a futile catch-22 (it can
    # only notify/triage, so it spam-notifies the CEO and respawns forever).
    # The resolver must be None so the blocker dispatch SKIPS it; the task is
    # mis-owned and must be re-routed / surfaced to the CEO out-of-band.
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "team": "backend",
        "assigned_to": AGENT_UUIDS["product-owner"],
    }
    assert orch._blocker_resolver_slug(task) is None


def test_blocked_task_assigned_to_head_marketing_is_not_dispatched() -> None:
    # Same catch-22 guard for the other board role.
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "team": "backend",
        "assigned_to": AGENT_UUIDS["head-marketing"],
    }
    assert orch._blocker_resolver_slug(task) is None


def test_blocked_task_held_by_dev_falls_back_to_cell_pm() -> None:
    orch = _orch()
    # A dev raised i_am_blocked and still holds the task → cell PM resolves.
    task: dict[str, Any] = {
        "id": "t1",
        "team": "backend",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
    }
    assert orch._blocker_resolver_slug(task) == "be-pm"


def test_blocked_task_unassigned_falls_back_to_cell_pm() -> None:
    orch = _orch()
    task: dict[str, Any] = {"id": "t1", "team": "frontend", "assigned_to": None}
    assert orch._blocker_resolver_slug(task) == "fe-pm"


def test_blocked_task_non_cell_team_unassigned_is_unroutable() -> None:
    orch = _orch()
    task: dict[str, Any] = {"id": "t1", "team": "board", "assigned_to": None}
    assert orch._blocker_resolver_slug(task) is None


# ---------------------------------------------------------------------------
# _dispatch_blocker_work — wire-shaped HITL skip. `_fetch_tasks` hands this
# dispatcher plain dicts decoded straight from GET /tasks JSON — this pins
# that shape (blocker_resolver_type as the lowercase enum-value string
# TaskResponse now serializes) rather than an in-process TaskTable/enum.
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_dispatch_blocker_work_skips_wire_shaped_hitl_blocked_task(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "blocked",
        "blocker_resolver_type": "human",
        "team": "backend",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
    }
    monkeypatch.setattr(orch, "_fetch_tasks", AsyncMock(return_value=[task]))
    spawn = AsyncMock()
    monkeypatch.setattr(orch, "spawn_agent", spawn)

    await orch._dispatch_blocker_work(client=MagicMock())

    spawn.assert_not_awaited()


@pytest.mark.asyncio
async def test_dispatch_blocker_work_spawns_non_hitl_blocked_task(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Control case: an agent-resolvable block (no HITL marker) still
    dispatches normally — the wire-shaped skip above isn't just refusing
    every blocked task."""
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "blocked",
        "blocker_resolver_type": None,
        "team": "backend",
        "assigned_to": AGENT_UUIDS["be-pm"],
    }
    monkeypatch.setattr(orch, "_fetch_tasks", AsyncMock(return_value=[task]))
    monkeypatch.setattr(orch, "_is_agent_active", lambda _agent_id: False)
    monkeypatch.setattr(orch, "_pm_respawn_should_gate", AsyncMock(return_value=False))
    monkeypatch.setattr(orch, "_build_pm_blocker_prompt", lambda _task: "p")
    monkeypatch.setattr(orch, "_task_git_context", lambda _task: None)
    spawn = AsyncMock()
    monkeypatch.setattr(orch, "spawn_agent", spawn)

    await orch._dispatch_blocker_work(client=MagicMock())

    spawn.assert_awaited_once()


# ---------------------------------------------------------------------------
# _claimed_task_needs_agent — claimed-but-no-agent detection
# ---------------------------------------------------------------------------

_STALE = (datetime.now(UTC) - timedelta(minutes=30)).isoformat()


def test_claimed_task_with_no_agent_past_grace_returns_assignee() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "claimed",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) == "be-dev-1"


def test_claimed_task_with_active_agent_is_healthy() -> None:
    orch = _orch()
    orch._instances["be-dev-1"] = _active_instance("be-dev-1")
    task: dict[str, Any] = {
        "id": "t1",
        "status": "claimed",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) is None


def test_claimed_task_within_grace_window_is_skipped() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "claimed",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
        # Compute "fresh" at test time, not module load: the grace check uses
        # wall-clock now(), so a module-level constant ages out of the window
        # during a long full-suite run and flakes this assertion.
        "updated_at": datetime.now(UTC).isoformat(),
    }
    # Fresh claim — spawn may still be in flight; do not churn.
    assert orch._claimed_task_needs_agent(task) is None


def test_claimed_task_without_assignee_is_skipped() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "claimed",
        "assigned_to": None,
        "claimed_by": None,
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) is None


def test_hitl_blocked_claimed_task_is_skipped() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "blocked",
        "blocker_resolver_type": "human",
        "assigned_to": AGENT_UUIDS["be-dev-1"],
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) is None


def test_claimed_task_assigned_to_ceo_is_not_respawned() -> None:
    # A claimed/in_progress task whose assignee is the CEO (or any human-only
    # role) has no container to respawn — the CEO is the human operator. The
    # resolver must return None so the dispatcher neither spawns a CEO
    # container NOR releases a human-owned task to pending. Defense-in-depth
    # for the spawn_agent human-role chokepoint (2026-06-27 CEO-spawn incident).
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "in_progress",
        "assigned_to": AGENT_UUIDS["ceo"],
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) is None


def test_in_progress_task_with_no_agent_returns_assignee() -> None:
    orch = _orch()
    task: dict[str, Any] = {
        "id": "t1",
        "status": "in_progress",
        "assigned_to": AGENT_UUIDS["fe-dev-2"],
        "updated_at": _STALE,
    }
    assert orch._claimed_task_needs_agent(task) == "fe-dev-2"


def test_claimed_task_with_unknown_assignee_returns_slug_for_release() -> None:
    # A claimed/in_progress task whose assignee is a stale/unknown UUID (no
    # seeded agent) must reach the release-to-pending path: the human-only guard
    # returns None for unknown slugs, so the slug falls through and is released.
    orch = _orch()
    unknown_uuid = str(uuid4())
    task: dict[str, Any] = {
        "id": "t1",
        "status": "claimed",
        "assigned_to": unknown_uuid,
        "updated_at": _STALE,
    }
    # Returns the (unknown) slug, NOT None — the release path is reachable.
    assert orch._claimed_task_needs_agent(task) == unknown_uuid


# ---------------------------------------------------------------------------
# _get_prompt_for_agent — role-appropriate respawn prompt (#19)
# ---------------------------------------------------------------------------
#
# A respawn must hand each role the prompt it can act on. The bug: the PM/board
# branch fell through to the developer prompt, telling a PM/board agent to write
# code and call verbs it does not own.


def _task(**over: Any) -> dict[str, Any]:
    base: dict[str, Any] = {
        "id": "t1",
        "title": "T",
        "status": "in_progress",
        "team": "backend",
    }
    base.update(over)
    return base


@pytest.mark.parametrize(
    ("agent_slug", "marker"),
    [
        ("be-dev-1", "development task"),
        ("be-qa", "ready for QA review"),
        ("be-doc", "ready for documentation"),
        ("be-pm", "PM for backend team"),
        ("main-pm", "MAIN PM at RoboCo"),
        ("product-owner", "You are on the Board"),
        ("auditor", "AUDIT"),
    ],
)
@pytest.mark.asyncio
async def test_get_prompt_for_agent_routes_by_role(
    agent_slug: str, marker: str
) -> None:
    orch = _orch()
    prompt = await orch._get_prompt_for_agent(agent_slug, _task())
    assert marker in prompt


@pytest.mark.asyncio
async def test_get_prompt_for_pm_is_not_the_dev_prompt() -> None:
    # Regression for #19: a respawned PM must NOT receive the developer prompt.
    orch = _orch()
    pm_prompt = await orch._get_prompt_for_agent("be-pm", _task())
    assert "development task" not in pm_prompt
    assert "You do NOT code" in pm_prompt


@pytest.mark.asyncio
async def test_get_prompt_for_board_is_not_the_dev_prompt() -> None:
    orch = _orch()
    board_prompt = await orch._get_prompt_for_agent("product-owner", _task())
    assert "development task" not in board_prompt
    assert "do NOT build, code" in board_prompt


@pytest.mark.asyncio
async def test_head_marketing_prompt_is_marketing_on_marketing_team() -> None:
    orch = _orch()
    prompt = await orch._get_prompt_for_agent("head-marketing", _task(team="marketing"))
    assert "marketing task" in prompt


@pytest.mark.asyncio
async def test_head_marketing_prompt_is_board_off_marketing_team() -> None:
    orch = _orch()
    prompt = await orch._get_prompt_for_agent("head-marketing", _task(team="backend"))
    assert "You are on the Board" in prompt


# ---------------------------------------------------------------------------
# _dispatch_claimed_without_agent — one-spawn-per-tick throttle (#19)
# ---------------------------------------------------------------------------
#
# `monkeypatch.setattr` is used to stub instance methods because direct
# attribute assignment (`orch.spawn_agent = ...`) trips mypy's method-assign
# check; the fixture is the type-safe, suppression-free way to do it.


def _stub_git_context(orch: AgentOrchestrator, monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(orch, "_task_git_context", lambda _task: None)


@pytest.mark.asyncio
async def test_dispatch_claimed_without_agent_spawns_at_most_one_per_tick(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    orch = _orch()
    orch._tick_handled_tasks = set()
    stale_tasks = [
        {"id": f"t{i}", "status": "claimed", "assigned_to": AGENT_UUIDS["be-dev-1"]}
        for i in range(3)
    ]
    monkeypatch.setattr(orch, "_fetch_tasks", AsyncMock(return_value=stale_tasks))
    monkeypatch.setattr(orch, "_claimed_task_needs_agent", lambda _task: "be-dev-1")
    _stub_git_context(orch, monkeypatch)
    spawn = AsyncMock()
    monkeypatch.setattr(orch, "spawn_agent", spawn)

    await orch._dispatch_claimed_without_agent(client=MagicMock())

    # Three agentless claims, but only ONE container spawned this tick.
    spawn.assert_awaited_once()


@pytest.mark.asyncio
async def test_dispatch_claimed_without_agent_has_no_progress_backoff(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Unlike `_dispatch_blocker_work` (every spawn gated through
    `_pm_respawn_should_gate`), this dispatcher carries no respawn-loop
    protection of its own — it unconditionally respawns an agentless
    claimed/in_progress task every tick past the grace window. This is half
    of why the escalate_up/unblock oscillation defeats the per-(agent, task)
    breaker: the resolved side of the cycle (the PM restored to in_progress)
    has no counter here to ever trip, so the loop's other half never runs out
    of fuel on its own — only a task-scoped breaker that also covers this
    path (by moving the task to `blocked` entirely, which this dispatcher
    doesn't fetch) can stop it.
    """
    orch = _orch()
    task = {
        "id": "t1",
        "status": "in_progress",
        "assigned_to": AGENT_UUIDS["fe-pm"],
        "updated_at": _STALE,
    }
    monkeypatch.setattr(orch, "_fetch_tasks", AsyncMock(return_value=[task]))
    _stub_git_context(orch, monkeypatch)
    monkeypatch.setattr(orch, "_get_prompt_for_agent", AsyncMock(return_value="p"))
    spawn = AsyncMock()
    monkeypatch.setattr(orch, "spawn_agent", spawn)

    cycles = 10
    for _ in range(cycles):
        orch._tick_handled_tasks = set()  # a fresh dispatch tick each cycle
        await orch._dispatch_claimed_without_agent(client=MagicMock())

    # No cycle was ever refused — zero backoff anywhere in this call path.
    assert spawn.await_count == cycles


@pytest.mark.asyncio
async def test_dispatch_claimed_without_agent_releases_unknown_without_spending_budget(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    # The release-to-pending path spawns nothing and must NOT consume the
    # per-tick spawn budget — it keeps draining stale unknown claims, then
    # spawns the first task with a known assignee.
    orch = _orch()
    orch._tick_handled_tasks = set()
    tasks = [
        {"id": "u1", "status": "claimed", "assigned_to": "ghost-uuid"},
        {"id": "u2", "status": "claimed", "assigned_to": "ghost-uuid"},
        {"id": "k1", "status": "claimed", "assigned_to": AGENT_UUIDS["be-dev-1"]},
    ]
    monkeypatch.setattr(orch, "_fetch_tasks", AsyncMock(return_value=tasks))

    def _needs(task: dict[str, Any]) -> str:
        return orch._resolve_agent_slug(str(task["assigned_to"]))

    monkeypatch.setattr(orch, "_claimed_task_needs_agent", _needs)
    _stub_git_context(orch, monkeypatch)
    release = AsyncMock()
    monkeypatch.setattr(orch, "_release_claim_to_pending", release)
    spawn = AsyncMock()
    monkeypatch.setattr(orch, "spawn_agent", spawn)

    await orch._dispatch_claimed_without_agent(client=MagicMock())

    expected_releases = 2  # both ghost claims released
    assert release.await_count == expected_releases
    spawn.assert_awaited_once()  # then one known assignee respawned


@pytest.mark.asyncio
async def test_handle_dev_existing_owner_skips_blocked() -> None:
    """A blocked task's owner is not respawned — it has no legal move from
    blocked, so respawning it only churns; it waits for unblock or release."""
    orch = _orch()
    respawn_mock = AsyncMock()
    with (
        patch.object(orch, "_respawn_dev_if_inactive", new=respawn_mock),
        patch.object(orch, "_is_agent_active", new=MagicMock(return_value=False)),
    ):
        await orch._handle_dev_existing_owner({"id": "t1"}, "blocked", "be-dev-1")
    respawn_mock.assert_not_called()


@pytest.mark.asyncio
async def test_handle_dev_existing_owner_respawns_in_progress() -> None:
    """An in_progress task whose owner is inactive is still respawned."""
    orch = _orch()
    respawn_mock = AsyncMock()
    with (
        patch.object(orch, "_respawn_dev_if_inactive", new=respawn_mock),
        patch.object(orch, "_is_agent_active", new=MagicMock(return_value=False)),
    ):
        await orch._handle_dev_existing_owner({"id": "t1"}, "in_progress", "be-dev-1")
    respawn_mock.assert_awaited_once()