"""The composition root. These tests exist because two components — the
delegation harness and the comment poller — were fully built, fully tested,
and reachable from nothing but their own tests. Unit tests that construct a
component directly cannot catch that; only assembly can."""

from pathlib import Path
from typing import Any

import httpx
import pytest
from test_config import SECRETS, tree

from nisse_dev.agent import build_agent, discover_models, prepare_workspace
from nisse_dev.catalog import ModelCatalog, UnknownModel
from nisse_dev.config import AgentConfig
from nisse_dev.git import GitRepo
from nisse_dev.oplog import OpLog

# What the test roles resolve to, as LiteLLM would report them.
TEST_CATALOG = ModelCatalog.from_payload(
    {
        "data": [
            {
                "model_name": alias,
                "litellm_params": {"model": f"anthropic/{alias}"},
                "model_info": {
                    "litellm_provider": "anthropic",
                    "supports_function_calling": True,
                    "max_input_tokens": 200000,
                    "max_output_tokens": 64000,
                },
            }
            for alias in ("claude-opus-5", "claude-haiku-4-5")
        ]
    }
)


def config_for(tmp_path: Path, **changes: str) -> AgentConfig:
    return AgentConfig.from_tree(
        tree(
            state_db=str(tmp_path / "state.db"),
            workspace=str(tmp_path / "work"),
            **changes,
        ),
        SECRETS,
    )


@pytest.fixture
def origin(tmp_path: Path) -> Path:
    """A bare repo standing in for the project on the forge."""
    remote = tmp_path / "origin.git"
    GitRepo(tmp_path)._run("init", "-q", "--bare", "-b", "main", str(remote))
    seed = GitRepo(tmp_path / "seed")
    seed.init()
    seed.configure_identity("seed", "seed@test")
    (seed.root / "README.md").write_text("project\n")
    seed.commit_all("seed")
    seed.push(str(remote), "main")
    return remote


def test_workspace_is_cloned_when_absent(tmp_path: Path, origin: Path) -> None:
    config = config_for(tmp_path, gitea__url=f"file://{origin}")
    # authenticated_url would mangle a file:// remote, so clone directly.
    GitRepo(tmp_path).clone(str(origin), config.workspace)
    repo = prepare_workspace(config, "nisse-dev-testing")

    assert (config.workspace / "README.md").exists()
    assert repo.current_branch() == "main"


def test_workspace_is_reused_when_already_cloned(tmp_path: Path, origin: Path) -> None:
    config = config_for(tmp_path)
    GitRepo(tmp_path).clone(str(origin), config.workspace)
    (config.workspace / "local-work.txt").write_text("in progress")

    prepare_workspace(config, "nisse-dev-testing")

    # Re-cloning would silently destroy uncommitted work.
    assert (config.workspace / "local-work.txt").exists()


class FakeTransport:
    def __init__(self) -> None:
        self.sent: list[str] = []
        self.started = False
        self.closed = False

    def send_message(self, text: str) -> None:
        self.sent.append(text)

    def send_approval_request(self, text: str) -> None:
        self.sent.append(text)

    def ask_question(self, text: str) -> None:
        self.sent.append(text)

    def on_message(self, callback: Any) -> None:
        self.callback = callback

    def start(self) -> None:
        self.started = True

    def close(self) -> None:
        self.closed = True


def build_offline(tmp_path: Path, origin: Path, monkeypatch: Any) -> Any:
    """Assemble the real graph with only the network boundaries faked."""
    config = config_for(tmp_path)
    GitRepo(tmp_path).clone(str(origin), config.workspace)

    monkeypatch.setattr(
        "nisse_dev.agent.GiteaClient.whoami", lambda self: "nisse-dev-testing"
    )
    monkeypatch.setattr(
        "nisse_dev.agent.ModelCatalog.discover",
        classmethod(lambda cls, *a, **kw: TEST_CATALOG),
    )
    monkeypatch.setattr("nisse_dev.agent.MatrixTransport", lambda cfg: FakeTransport())
    monkeypatch.setattr(
        "nisse_dev.agent.authenticated_url",
        lambda base, repo, user, token: str(origin),
    )
    return build_agent(config)


def test_the_whole_graph_assembles(tmp_path: Path, origin: Path, monkeypatch) -> None:
    agent = build_offline(tmp_path, origin, monkeypatch)
    orchestrator = agent.orchestrator

    # Every component that was previously unreachable is now connected.
    assert orchestrator._executor is not None
    assert orchestrator._publisher is not None
    assert orchestrator._board is not None
    assert orchestrator._delegate is not None
    assert orchestrator._poller_factory is not None
    assert orchestrator._executor._delegate is not None  # A12 escalation path
    assert orchestrator._executor._expert is not None  # A14 consult path
    agent.stop()


def test_start_announces_where_it_resumed(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    agent = build_offline(tmp_path, origin, monkeypatch)
    agent.start()

    assert agent.transport.started
    readiness = agent.transport.sent[-1]
    assert "nisse-dev up as nisse-dev-testing" in readiness
    assert "greet" in readiness  # the project
    assert "claude-opus-5" in readiness  # the pinned planner
    agent.stop()


def test_stop_closes_everything_and_releases_the_wait(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    agent = build_offline(tmp_path, origin, monkeypatch)
    agent.start()
    agent.stop()

    assert agent.transport.closed
    agent.wait()  # returns immediately rather than hanging
    assert agent.store.closed


def test_poller_factory_ignores_the_agents_own_comments(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    # Without this the agent answers its own PR replies in a loop.
    agent = build_offline(tmp_path, origin, monkeypatch)
    poller = agent.orchestrator._poller_factory(lambda c: None)
    assert "nisse-dev-testing" in poller._ignore
    agent.stop()


def test_delegation_uses_the_passthrough_route(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    # A13: delegations run vendor-native; the normalized route is for the
    # places where fidelity is cheap.
    from nisse_dev.llm import AnthropicPassthroughClient, LiteLLMClient

    agent = build_offline(tmp_path, origin, monkeypatch)
    delegation = agent.orchestrator._delegate
    assert isinstance(delegation._client._inner, AnthropicPassthroughClient)
    assert isinstance(agent.orchestrator._executor._client._inner, LiteLLMClient)
    agent.stop()


def test_httpx_clients_are_not_shared_between_routes(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    agent = build_offline(tmp_path, origin, monkeypatch)
    normalized = agent.orchestrator._executor._client._inner._http
    passthrough = agent.orchestrator._delegate._client._inner._http
    assert isinstance(normalized, httpx.Client)
    assert normalized is not passthrough  # different base URLs and headers
    agent.stop()


# --- startup model discovery (A5/A11) ------------------------------------


def test_a_typod_role_refuses_to_boot(tmp_path: Path, monkeypatch) -> None:
    # Misconfiguration should cost a second at startup, not be discovered ten
    # minutes into a milestone.
    config = config_for(tmp_path, roles__planner="clause-opus-5")
    monkeypatch.setattr(
        "nisse_dev.agent.ModelCatalog.discover",
        classmethod(lambda cls, *a, **kw: TEST_CATALOG),
    )
    with pytest.raises(UnknownModel, match="planner='clause-opus-5'"):
        discover_models(config, OpLog("test"))


def test_a_role_this_key_cannot_reach_refuses_to_boot(
    tmp_path: Path, monkeypatch
) -> None:
    # /model/info is scoped per key, so the same check catches a role pointed
    # at a real model that this token has no access to.
    config = config_for(tmp_path, roles__executor="local-fast")
    monkeypatch.setattr(
        "nisse_dev.agent.ModelCatalog.discover",
        classmethod(lambda cls, *a, **kw: TEST_CATALOG),
    )
    with pytest.raises(UnknownModel, match="executor='local-fast'"):
        discover_models(config, OpLog("test"))


def test_a_tool_less_model_warns_but_still_boots(tmp_path: Path, monkeypatch) -> None:
    # A15 expects weak local models to be accommodated, and models LiteLLM
    # declares tool-less are observed driving tool loops anyway.
    import io

    tool_less = ModelCatalog.from_payload(
        {
            "data": [
                {
                    "model_name": alias,
                    "litellm_params": {"model": "openai/qwen3-8b-awq"},
                    "model_info": {
                        "litellm_provider": "openai",
                        "supports_function_calling": False,
                        "max_input_tokens": 32768,
                    },
                }
                for alias in ("claude-opus-5", "claude-haiku-4-5")
            ]
        }
    )
    monkeypatch.setattr(
        "nisse_dev.agent.ModelCatalog.discover",
        classmethod(lambda cls, *a, **kw: tool_less),
    )
    stream = io.StringIO()
    discover_models(config_for(tmp_path), OpLog("test", stream))

    logged = stream.getvalue()
    assert "model_tools_unsupported" in logged
    assert '"role": "executor"' in logged
    assert '"role": "consultant"' not in logged  # ask_expert drives no tools


def test_the_resolved_model_is_pinned_at_task_start(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    agent = build_offline(tmp_path, origin, monkeypatch)
    # The store belongs to the worker thread, so the work has to run there.
    agent.worker.call(lambda: agent.orchestrator._begin_project("greet"))

    pinned = agent.orchestrator._data["models"]
    assert pinned["planner"] == {
        "alias": "claude-opus-5",
        "backing": "anthropic/claude-opus-5",
        "provider": "anthropic",
    }
    agent.stop()


def test_delegation_records_what_the_alias_resolved_to(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    # A16 eval history keyed on an alias alone would average across whatever
    # that alias pointed at over time.
    agent = build_offline(tmp_path, origin, monkeypatch)
    assert agent.orchestrator._delegate._backing_model == "anthropic/claude-opus-5"
    agent.stop()


def test_tuning_reaches_every_component(
    tmp_path: Path, origin: Path, monkeypatch
) -> None:
    from dataclasses import replace

    from nisse_dev.config import (
        DelegationTuning,
        ExecutorTuning,
        ExpertTuning,
        ToolsTuning,
        Tuning,
    )

    config = replace(
        config_for(tmp_path),
        max_output_tokens=8192,
        tuning=Tuning(
            executor=ExecutorTuning(max_turns=40, failure_limit=3),
            expert=ExpertTuning(consult_budget=5),
            delegation=DelegationTuning(
                max_turns=12, max_tokens=50_000, wall_clock_s=60
            ),
            tools=ToolsTuning(command_timeout_s=300, max_output_chars=2000),
        ),
    )
    GitRepo(tmp_path).clone(str(origin), config.workspace)
    monkeypatch.setattr(
        "nisse_dev.agent.GiteaClient.whoami", lambda self: "nisse-dev-testing"
    )
    monkeypatch.setattr(
        "nisse_dev.agent.ModelCatalog.discover",
        classmethod(lambda cls, *a, **kw: TEST_CATALOG),
    )
    monkeypatch.setattr("nisse_dev.agent.MatrixTransport", lambda cfg: FakeTransport())
    monkeypatch.setattr(
        "nisse_dev.agent.authenticated_url",
        lambda base, repo, user, token: str(origin),
    )
    agent = build_agent(config)
    executor = agent.orchestrator._executor
    delegation = agent.orchestrator._delegate

    assert (executor._max_turns, executor._failure_limit) == (40, 3)
    assert executor._expert._budget == 5
    assert delegation._caps.turns == 12
    assert delegation._caps.tokens == 50_000
    assert delegation._caps.wall_clock_s == 60
    assert executor._workspace._timeout_s == 300
    assert executor._workspace._max_output_chars == 2000
    assert executor._client._inner._max_tokens == 8192
    assert delegation._client._inner._max_tokens == 8192
    assert executor._client._max_output_tokens == 8192
    # tool_choice is asked of exactly the models LiteLLM declares enforce it.
    assert executor._client._enforces_tool_choice("claude-opus-5") is False
    agent.stop()