"""Unit tests for WS3: agent_team.nodes.dispatch_invoker + graph/coordinator wiring.

Tests cover:
* :func:`make_dispatch_node` — factory contract, fail-closed on missing fields
  (parks on missing thread_id/diff/scope), injection of owner/repo at factory
  time (never read from state), scope list flattening, happy-path returns empty
  dict (partial state update) and calls dispatcher.
* :func:`agent_team.graph.build_graph` with ``dispatch_node`` wired — verifies
  the DISPATCH_NODE constant is exported and the graph compiles with/without it.
* :func:`agent_team.coordinator.default_dispatch_node_factory` — env-var binding
  and fail-closed when required vars are unset.
* :class:`agent_team.coordinator.Coordinator` ``dispatch_node_wiring`` seam —
  accepted at __init__, NOT called in setup() when build_verify_wiring is None
  (DISPATCH_NODE requires VERIFY_NODE/APPROVED_ROUTE to exist).

All network + subprocess calls are replaced with injected fakes; no model, no
git, no GitHub, no subprocess.
"""

from __future__ import annotations

from typing import Any
from unittest.mock import MagicMock

import pytest

from agent_team.nodes.dispatch_invoker import DispatchNodeFactory, make_dispatch_node
from agent_team.task_model import Phase, TaskStatus


# --------------------------------------------------------------------------- #
# Fake BranchPusher / WorkflowDispatcher (the two injectable seams in dispatcher)
# --------------------------------------------------------------------------- #


def _make_fake_pusher() -> tuple[list[dict[str, Any]], Any]:
    calls: list[dict[str, Any]] = []

    def _pusher(
        *, owner: str, repo: str, base: str, head_branch: str, diff_text: str
    ) -> None:
        calls.append(dict(owner=owner, repo=repo, base=base, head_branch=head_branch))

    return calls, _pusher


def _make_fake_workflow_dispatcher() -> tuple[list[dict[str, Any]], Any]:
    calls: list[dict[str, Any]] = []

    def _dispatcher(*, owner: str, repo: str, inputs: dict[str, str], ref: str) -> None:
        calls.append(dict(owner=owner, repo=repo, ref=ref, inputs=inputs))

    return calls, _dispatcher


def _fake_seams() -> tuple[Any, Any]:
    """Return (fake_pusher, fake_dispatcher) that silence all subprocess calls."""
    _, pusher = _make_fake_pusher()
    _, dispatcher = _make_fake_workflow_dispatcher()
    return pusher, dispatcher


_VALID_STATE: dict[str, Any] = {
    "thread_id": "task-abc",
    "candidate_diff": (
        "diff --git a/f.py b/f.py\n--- a/f.py\n+++ b/f.py\n@@ -1 +1 @@\n-old\n+new"
    ),
    "plan": {"scope": ["agent_team/"]},
    "status": "active",
    "current_phase": "verify",
}


# --------------------------------------------------------------------------- #
# make_dispatch_node — happy path
# --------------------------------------------------------------------------- #


def test_dispatch_node_happy_path_returns_partial_state() -> None:
    """On success the node returns {} (partial state update — DONE comes from graph)."""
    pusher, dispatcher = _fake_seams()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )
    result = node(_VALID_STATE)

    # Remote implementation returns {} on success (graph topology marks DONE).
    assert isinstance(result, dict)


def test_dispatch_node_injects_owner_repo_at_factory_time() -> None:
    """owner/repo come from factory args — model output in state cannot redirect them."""
    pusher_calls, pusher = _make_fake_pusher()
    _, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="trusted-org", repo="trusted-repo", pusher=pusher, dispatcher=dispatcher
    )
    node(_VALID_STATE)

    assert pusher_calls, "pusher should have been called"
    assert pusher_calls[0]["owner"] == "trusted-org"
    assert pusher_calls[0]["repo"] == "trusted-repo"


def test_dispatch_node_passes_task_id_to_head_branch() -> None:
    pusher_calls, pusher = _make_fake_pusher()
    _, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", base="main", pusher=pusher, dispatcher=dispatcher
    )
    node(_VALID_STATE)

    assert pusher_calls, "pusher should have been called"
    # build_dispatch_inputs derives head_branch from task_id.
    assert "task-abc" in pusher_calls[0]["head_branch"]
    assert pusher_calls[0]["base"] == "main"


def test_dispatch_node_passes_scope_to_workflow_dispatcher() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )
    node(_VALID_STATE)

    assert disp_calls, "workflow dispatcher should have been called"
    wf_inputs = disp_calls[0]["inputs"]
    assert "agent_team/" in str(wf_inputs)


def test_dispatch_node_flattens_scope_list_to_string() -> None:
    """Multi-entry scope list is newline-joined into declared_scope."""
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, plan={"scope": ["agent_team/", "tests/"]})
    node(state)

    wf_inputs = disp_calls[0]["inputs"]
    scope_str = str(wf_inputs)
    assert "agent_team/" in scope_str


# --------------------------------------------------------------------------- #
# make_dispatch_node — fail closed (never dispatches incomplete input)
# --------------------------------------------------------------------------- #


def test_dispatch_node_parks_on_missing_thread_id() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, thread_id="")
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert result.get("current_phase") == Phase.PARKED.value
    assert not disp_calls  # dispatcher never called


def test_dispatch_node_parks_on_missing_diff() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, candidate_diff="")
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert not disp_calls


def test_dispatch_node_parks_on_whitespace_only_diff() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, candidate_diff="   \n  ")
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert not disp_calls


def test_dispatch_node_parks_on_empty_scope() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, plan={"scope": []})
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert not disp_calls


def test_dispatch_node_parks_on_none_plan() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, plan=None)
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert not disp_calls


def test_dispatch_node_parks_on_non_dict_plan() -> None:
    _, pusher = _make_fake_pusher()
    disp_calls, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
    )

    state = dict(_VALID_STATE, plan="not-a-dict")
    result = node(state)

    assert result.get("status") == TaskStatus.PARKED.value
    assert not disp_calls


def test_dispatch_node_parks_on_dispatcher_error() -> None:
    """A DispatcherError from the underlying dispatcher parks the task (fail safe)."""
    from agent_team.dispatcher import DispatcherError

    def _bad_pusher(**_kwargs: Any) -> None:
        raise DispatcherError("invalid owner/repo 'x'/'y'")

    _, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=_bad_pusher, dispatcher=dispatcher
    )
    result = node(_VALID_STATE)

    assert result.get("status") == TaskStatus.PARKED.value


def test_dispatch_node_parks_on_unexpected_exception() -> None:
    """Any unexpected error parks the task rather than crashing the graph."""

    def _exploding_pusher(**_kwargs: Any) -> None:
        raise RuntimeError("network timeout")

    _, dispatcher = _make_fake_workflow_dispatcher()
    node = make_dispatch_node(
        owner="org", repo="repo", pusher=_exploding_pusher, dispatcher=dispatcher
    )
    result = node(_VALID_STATE)

    assert result.get("status") == TaskStatus.PARKED.value


# --------------------------------------------------------------------------- #
# DispatchNodeFactory type alias export
# --------------------------------------------------------------------------- #


def test_dispatch_node_factory_type_is_exported() -> None:
    from agent_team.nodes import dispatch_invoker

    assert hasattr(dispatch_invoker, "DispatchNodeFactory")


def test_dispatch_node_factory_satisfies_zero_arg_contract() -> None:
    """DispatchNodeFactory is a zero-arg callable that returns a node callable."""
    pusher, dispatcher = _fake_seams()
    factory: DispatchNodeFactory = lambda: make_dispatch_node(  # noqa: E731
        owner="o", repo="r", pusher=pusher, dispatcher=dispatcher
    )
    node = factory()
    assert callable(node)
    result = node(_VALID_STATE)
    assert isinstance(result, dict)


# --------------------------------------------------------------------------- #
# graph.build_graph — DISPATCH_NODE constant and compile-time wiring
# --------------------------------------------------------------------------- #


def test_build_graph_dispatch_node_constant_is_exported() -> None:
    from agent_team import graph as graph_mod

    assert hasattr(graph_mod, "DISPATCH_NODE")
    assert graph_mod.DISPATCH_NODE == "dispatch_node"


def test_build_graph_without_dispatch_node_compiles() -> None:
    """Default (no dispatch_node) builds fine — backward-compatible."""
    from langgraph.checkpoint.memory import MemorySaver

    from agent_team.graph import build_graph

    graph = build_graph(MemorySaver())
    assert graph is not None


def test_build_graph_with_dispatch_node_no_build_verify_raises() -> None:
    """dispatch_node without build_verify raises ValueError (APPROVED_ROUTE requires P3)."""
    from langgraph.checkpoint.memory import MemorySaver

    from agent_team.graph import build_graph

    def _fake_dispatch(state: Any) -> Any:
        return {}

    with pytest.raises(ValueError, match="dispatch_node requires build_verify"):
        build_graph(MemorySaver(), dispatch_node=_fake_dispatch)


# --------------------------------------------------------------------------- #
# coordinator.default_dispatch_node_factory
# --------------------------------------------------------------------------- #


def test_default_dispatch_node_factory_raises_without_env_vars(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.delenv("AGENT_TEAM_REPO_OWNER", raising=False)
    monkeypatch.delenv("AGENT_TEAM_REPO_NAME", raising=False)

    from agent_team.coordinator import default_dispatch_node_factory

    with pytest.raises(RuntimeError, match="AGENT_TEAM_REPO_OWNER"):
        default_dispatch_node_factory()


def test_default_dispatch_node_factory_raises_when_only_owner_set(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("AGENT_TEAM_REPO_OWNER", "org")
    monkeypatch.delenv("AGENT_TEAM_REPO_NAME", raising=False)

    from agent_team.coordinator import default_dispatch_node_factory

    with pytest.raises(RuntimeError):
        default_dispatch_node_factory()


def test_default_dispatch_node_factory_returns_callable_with_env_vars(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("AGENT_TEAM_REPO_OWNER", "test-org")
    monkeypatch.setenv("AGENT_TEAM_REPO_NAME", "test-repo")
    monkeypatch.delenv("AGENT_TEAM_BASE_BRANCH", raising=False)

    from agent_team.coordinator import default_dispatch_node_factory

    node = default_dispatch_node_factory()
    assert callable(node)


def test_default_dispatch_node_factory_reads_base_branch_from_env(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("AGENT_TEAM_REPO_OWNER", "org")
    monkeypatch.setenv("AGENT_TEAM_REPO_NAME", "repo")
    monkeypatch.setenv("AGENT_TEAM_BASE_BRANCH", "develop")

    from agent_team.coordinator import default_dispatch_node_factory

    node = default_dispatch_node_factory()
    assert callable(node)


def test_default_dispatch_node_factory_in_all() -> None:
    from agent_team import coordinator

    assert "default_dispatch_node_factory" in coordinator.__all__


# --------------------------------------------------------------------------- #
# Coordinator.dispatch_node_wiring seam
# --------------------------------------------------------------------------- #


def test_coordinator_accepts_dispatch_node_wiring_param() -> None:
    """Coordinator.__init__ accepts dispatch_node_wiring=None without error."""
    from agent_team.coordinator import Coordinator
    from agent_team.transport.base import Transport

    transport = MagicMock(spec=Transport)
    coord = Coordinator(
        db_path=":memory:",
        transport=transport,
        dispatch_node_wiring=None,
    )
    assert coord is not None


def test_coordinator_dispatch_node_wiring_without_build_verify_raises(
    tmp_path: Any,
) -> None:
    """setup() raises ValueError when dispatch_node_wiring is set but build_verify_wiring is None.

    build_graph enforces that dispatch_node requires build_verify (APPROVED_ROUTE
    lives inside the P3 subgraph). Passing dispatch_node_wiring alone is a
    configuration error caught at setup time.
    """
    from langgraph.checkpoint.memory import MemorySaver

    from agent_team.coordinator import Coordinator
    from agent_team.transport.base import Transport

    pusher, dispatcher = _fake_seams()

    def _factory() -> Any:
        return make_dispatch_node(
            owner="org", repo="repo", pusher=pusher, dispatcher=dispatcher
        )

    def _stub_clarify_node() -> Any:
        return MagicMock()

    def _stub_checkpointer(db_path: Any) -> Any:
        return MemorySaver()

    transport = MagicMock(spec=Transport)
    coord = Coordinator(
        db_path=tmp_path / "test.db",
        transport=transport,
        build_clarify_node=_stub_clarify_node,
        build_checkpointer=_stub_checkpointer,
        dispatch_node_wiring=_factory,
        # build_verify_wiring=None (default)
    )

    with pytest.raises(ValueError, match="dispatch_node requires build_verify"):
        coord.setup()