"""TurnRunner._build_tools surfaces meta_invoke when meta-skills are loaded.

meta_invoke is registered with ``exposed_by_default=False`` so the tool
catalogue stays clean in deployments that don't ship meta-skills. When
at least one ``kind=meta`` skill IS loaded, ``_build_tools`` must add
``"meta_invoke"`` to ``ctx.surfaced_tools`` so the registry's visibility
check at :func:`ToolRegistry._is_visible` lets it through.
"""

from __future__ import annotations

import inspect
from pathlib import Path
from types import SimpleNamespace

import pytest

from opensquilla.engine.pipeline import TurnContext
from opensquilla.engine.runtime import TurnRunner
from opensquilla.provider import ToolDefinition, ToolInputSchema
from opensquilla.skills.loader import SkillLoader
from opensquilla.tools.registry import get_default_registry
from opensquilla.tools.types import ToolContext


def _make_loader_with_meta(
    tmp_path: Path,
    *,
    disable_model_invocation: bool = False,
) -> SkillLoader:
    bundled = tmp_path / "skills" / "bundled"
    bundled.mkdir(parents=True)
    skill_dir = bundled / "meta-tiny"
    skill_dir.mkdir()
    (skill_dir / "SKILL.md").write_text(
        '---\n'
        'name: meta-tiny\n'
        'kind: meta\n'
        'description: tiny meta-skill\n'
        f'disable-model-invocation: {str(disable_model_invocation).lower()}\n'
        'triggers: [tiny-meta-trigger]\n'
        'composition:\n'
        '  steps:\n'
        '    - id: c\n'
        '      kind: llm_classify\n'
        '      output_choices: [A, B]\n'
        '      with: {text: "x"}\n'
        '---\n'
        '# meta-tiny\n',
        encoding="utf-8",
    )
    loader = SkillLoader(bundled_dir=bundled, snapshot_path=tmp_path / "snap.json")
    loader.invalidate_cache()
    loader.load_all()
    return loader


def _make_loader_without_meta(tmp_path: Path) -> SkillLoader:
    bundled = tmp_path / "skills" / "bundled"
    bundled.mkdir(parents=True)
    loader = SkillLoader(bundled_dir=bundled, snapshot_path=tmp_path / "snap.json")
    loader.invalidate_cache()
    loader.load_all()
    return loader


def test_build_tools_surfaces_meta_invoke_when_meta_skill_present(
    tmp_path: Path,
) -> None:
    registry = get_default_registry()
    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=True))
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(is_owner=True, workspace_dir=str(tmp_path))
    tool_defs, _handler = runner._build_tools(ctx)
    names = {getattr(td, "name", "") for td in tool_defs}

    assert "meta_invoke" in names, (
        f"meta_invoke should be surfaced when meta-skills present; got {sorted(names)[:20]}"
    )
    assert ctx.surfaced_tools is not None
    assert "meta_invoke" in ctx.surfaced_tools


def test_build_tools_does_not_surface_meta_invoke_without_meta_skills(
    tmp_path: Path,
) -> None:
    """When no meta-skills are loaded, meta_invoke stays hidden — its
    ``exposed_by_default=False`` keeps the catalogue tight for deployments
    that don't ship meta-skills."""
    registry = get_default_registry()
    loader = _make_loader_without_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=None)
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(is_owner=True, workspace_dir=str(tmp_path))
    tool_defs, _handler = runner._build_tools(ctx)
    names = {getattr(td, "name", "") for td in tool_defs}

    assert "meta_invoke" not in names, (
        f"meta_invoke should be hidden when no meta-skills present; got {sorted(names)[:20]}"
    )
    # surfaced_tools may stay None (no mutation) — either way meta_invoke
    # must not be inside it
    assert ctx.surfaced_tools is None or "meta_invoke" not in ctx.surfaced_tools


def test_build_tools_does_not_surface_meta_invoke_for_disabled_meta_skill(
    tmp_path: Path,
) -> None:
    registry = get_default_registry()
    loader = _make_loader_with_meta(tmp_path, disable_model_invocation=True)
    runner = TurnRunner(provider_selector=None, config=None)
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(is_owner=True, workspace_dir=str(tmp_path))
    tool_defs, _handler = runner._build_tools(ctx)
    names = {getattr(td, "name", "") for td in tool_defs}

    assert "meta_invoke" not in names
    assert ctx.surfaced_tools is None or "meta_invoke" not in ctx.surfaced_tools


def test_build_tools_does_not_surface_meta_invoke_when_meta_skill_disabled_by_config(
    tmp_path: Path,
) -> None:
    from types import SimpleNamespace

    registry = get_default_registry()
    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(
        provider_selector=None,
        config=SimpleNamespace(meta_skill=SimpleNamespace(enabled=False)),
    )
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(is_owner=True, workspace_dir=str(tmp_path))
    metadata: dict[str, object] = {}
    tool_defs, _handler = runner._build_tools(ctx, metadata=metadata)
    names = {getattr(td, "name", "") for td in tool_defs}

    assert "meta_invoke" not in names
    assert ctx.surfaced_tools is None or "meta_invoke" not in ctx.surfaced_tools
    assert metadata["meta_skill_enabled"] is False


def test_build_tools_preserves_existing_surfaced_tools(tmp_path: Path) -> None:
    """If the caller pre-populates ctx.surfaced_tools (e.g. for a custom
    per-request tool surface), _build_tools must add to it, not overwrite."""
    registry = get_default_registry()
    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=True))
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(
        is_owner=True,
        workspace_dir=str(tmp_path),
        surfaced_tools={"some_other_tool"},
    )
    runner._build_tools(ctx)
    assert ctx.surfaced_tools is not None
    assert "meta_invoke" in ctx.surfaced_tools
    assert "some_other_tool" in ctx.surfaced_tools, (
        "must extend existing surfaced_tools, not replace it"
    )


def test_runtime_does_not_hard_auto_invoke_meta_match() -> None:
    """Meta trigger matches must go through the outer LLM prompt/tool path.

    The meta_resolution step already injects a system-prompt hint and exposes
    meta_invoke. Runtime must not bypass that prompt by directly calling
    _run_one_streaming when metadata["meta_match"] is present.
    """
    source = inspect.getsource(TurnRunner._run_turn)

    assert "meta_resolution.auto_invoke" not in source
    assert "auto_meta_invoke_" not in source


@pytest.mark.asyncio
async def test_runtime_pipeline_runs_meta_resolution_before_skill_filter(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    async def noop_router(ctx: TurnContext) -> TurnContext:
        return ctx

    noop_router.__name__ = "apply_squilla_router"
    monkeypatch.setattr("opensquilla.engine.steps.apply_squilla_router", noop_router)

    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=True))
    runner._skill_loader = loader

    turn, _provider = await runner._run_pipeline(
        "please run tiny-meta-trigger for this request",
        "agent:main:test-meta-resolution",
        None,
        None,
        [
            ToolDefinition(
                name="meta_invoke",
                description="invoke meta skills",
                input_schema=ToolInputSchema(),
            ),
            ToolDefinition(
                name="web_search",
                description="search the web",
                input_schema=ToolInputSchema(),
            ),
        ],
        "base prompt",
        [],
    )

    step_names = [record.step_name for record in turn.metadata["pipeline_steps"]]
    assert step_names.index("meta_resolution") < step_names.index("filter_skills")
    assert turn.metadata["meta_match"].plan.name == "meta-tiny"
    assert "meta_invoke(name=\"meta-tiny\")" in str(turn.system_prompt)
    assert "meta-tiny" in str(turn.system_prompt)

    # Deterministic trigger matches force the first tool call to meta_invoke so
    # cheaper routed models do not bypass the meta DAG by calling ordinary tools.
    assert {tool.name for tool in turn.tool_defs} == {"meta_invoke", "web_search"}
    assert "meta_match_tool_surface_restricted" not in turn.metadata
    assert turn.metadata["meta_match_tool_choice"] == {
        "type": "function",
        "function": {"name": "meta_invoke"},
    }


@pytest.mark.asyncio
async def test_runtime_pipeline_restores_mainline_meta_and_coding_order(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    async def noop_router(ctx: TurnContext) -> TurnContext:
        return ctx

    noop_router.__name__ = "apply_squilla_router"
    monkeypatch.setattr("opensquilla.engine.steps.apply_squilla_router", noop_router)

    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=False))
    runner._skill_loader = _make_loader_without_meta(tmp_path)

    turn, _provider = await runner._run_pipeline(
        "hello",
        "agent:main:test-mainline-pipeline-order",
        None,
        None,
        [
            ToolDefinition(
                name="web_search",
                description="search the web",
                input_schema=ToolInputSchema(),
            ),
        ],
        "base prompt",
        [],
    )

    assert [record.step_name for record in turn.metadata["pipeline_steps"]] == [
        "resolve_model",
        "apply_vision_followup_gate",
        "apply_squilla_router",
        "observe_reasoning_hint",
        "meta_resolution",
        "enforce_coding_mode",
        "meta_command_launch",
        "filter_skills",
        "inject_subagent_grounding",
        "inject_platform_hint",
        "apply_prompt_cache",
    ]


@pytest.mark.asyncio
async def test_runtime_pipeline_pins_meta_skill_when_skill_filter_enabled(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """When the retriever is on, ``<available_skills>`` may drop the
    meta-skill description out of the prompt. The matched meta-skill is
    pinned, and deterministic trigger matches force meta_invoke as the first
    tool call while leaving the broader tool surface intact for later turns.
    """
    async def noop_router(ctx: TurnContext) -> TurnContext:
        return ctx

    noop_router.__name__ = "apply_squilla_router"
    monkeypatch.setattr("opensquilla.engine.steps.apply_squilla_router", noop_router)

    loader = _make_loader_with_meta(tmp_path)
    skills_cfg = SimpleNamespace(
        filter_enabled=True,
        filter_top_k=5,
        max_skills_prompt_chars=8000,
        injection_mode="system",
    )
    runner = TurnRunner(
        provider_selector=None,
        config=SimpleNamespace(
            skills=skills_cfg,
            meta_skill=SimpleNamespace(enabled=True, auto_trigger=True),
        ),
    )
    runner._skill_loader = loader

    turn, _provider = await runner._run_pipeline(
        "please run tiny-meta-trigger for this request",
        "agent:main:test-meta-restrict",
        None,
        None,
        [
            ToolDefinition(
                name="meta_invoke",
                description="invoke meta skills",
                input_schema=ToolInputSchema(),
            ),
            ToolDefinition(
                name="web_search",
                description="search the web",
                input_schema=ToolInputSchema(),
            ),
        ],
        "base prompt",
        [],
    )

    assert turn.metadata["meta_match"].plan.name == "meta-tiny"
    assert {tool.name for tool in turn.tool_defs} == {"meta_invoke", "web_search"}
    assert "meta_match_tool_surface_restricted" not in turn.metadata
    assert turn.metadata["meta_match_tool_choice"] == {
        "type": "function",
        "function": {"name": "meta_invoke"},
    }
    assert "meta-tiny" in str(turn.system_prompt)


def _meta_cfg(auto_trigger: bool) -> SimpleNamespace:
    return SimpleNamespace(meta_skill=SimpleNamespace(enabled=True, auto_trigger=auto_trigger))


@pytest.mark.asyncio
async def test_pipeline_hides_meta_skill_from_prompt_when_auto_trigger_off(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    async def noop_router(ctx: TurnContext) -> TurnContext:
        return ctx

    noop_router.__name__ = "apply_squilla_router"
    monkeypatch.setattr("opensquilla.engine.steps.apply_squilla_router", noop_router)

    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=False))
    runner._skill_loader = loader

    turn, _provider = await runner._run_pipeline(
        "what is the capital of France?",  # non-triggering: isolates skills_filter
        "agent:main:test-meta-hidden",
        None,
        None,
        [
            ToolDefinition(name="web_search", description="search", input_schema=ToolInputSchema()),
        ],
        "base prompt",
        [],
    )

    assert "meta-tiny" not in str(turn.system_prompt)
    assert "meta-tiny" not in (turn.metadata.get("filtered_skill_ids") or [])


@pytest.mark.asyncio
async def test_pipeline_shows_meta_skill_when_auto_trigger_on(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    async def noop_router(ctx: TurnContext) -> TurnContext:
        return ctx

    noop_router.__name__ = "apply_squilla_router"
    monkeypatch.setattr("opensquilla.engine.steps.apply_squilla_router", noop_router)

    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=True))
    runner._skill_loader = loader

    turn, _provider = await runner._run_pipeline(
        "what is the capital of France?",  # non-triggering: isolates skills_filter
        "agent:main:test-meta-shown",
        None,
        None,
        [
            ToolDefinition(
                name="meta_invoke",
                description="invoke",
                input_schema=ToolInputSchema(),
            ),
            ToolDefinition(name="web_search", description="search", input_schema=ToolInputSchema()),
        ],
        "base prompt",
        [],
    )

    assert "meta-tiny" in str(turn.system_prompt)


def test_build_tools_hides_meta_invoke_when_auto_trigger_off(tmp_path: Path) -> None:
    """Default manual-only: meta-skill present but auto_trigger off => no meta_invoke."""
    registry = get_default_registry()
    loader = _make_loader_with_meta(tmp_path)
    runner = TurnRunner(provider_selector=None, config=_meta_cfg(auto_trigger=False))
    runner._tool_registry = registry
    runner._skill_loader = loader

    ctx = ToolContext(is_owner=True, workspace_dir=str(tmp_path))
    tool_defs, _handler = runner._build_tools(ctx)
    names = {getattr(td, "name", "") for td in tool_defs}

    assert "meta_invoke" not in names
    assert ctx.surfaced_tools is None or "meta_invoke" not in ctx.surfaced_tools