"""v0.3 PR #4 — Skills (LLM-routing) tests.

Covers:
1. Bootstrap creates the user skills directory (idempotent, no example seeded).
2. `list_installed_skills` parses well-formed SKILL.md entries.
3. Silently skips malformed entries (no frontmatter / bad YAML / name-dir mismatch).
4. `read_skill_body` returns the full file contents or None for missing skills.
5. `resolve_skill_sources` returns the user skills dir as a single source.
6. End-to-end: `build_agent(..., skills_sources_override=[...])` forwards the
   list as `create_deep_agent(skills=...)`.
"""

from __future__ import annotations

from pathlib import Path
from textwrap import dedent
from typing import Any

import pytest

from my_deepagent.config import load_config
from my_deepagent.skills import (
    SKILL_FILENAME,
    SkillInfo,
    ensure_skills_initialized,
    list_installed_skills,
    read_skill_body,
    resolve_skill_sources,
    user_skills_dir,
)

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _make_skill(
    skills_dir: Path, name: str, *, description: str | None = None, body: str = ""
) -> Path:
    """Drop a well-formed `<name>/SKILL.md` under skills_dir."""
    skill_dir = skills_dir / name
    skill_dir.mkdir(parents=True, exist_ok=True)
    desc = description if description is not None else f"description for {name}"
    content = dedent(
        f"""\
        ---
        name: {name}
        description: {desc}
        ---

        # {name}
        {body}
        """
    )
    (skill_dir / SKILL_FILENAME).write_text(content, encoding="utf-8")
    return skill_dir


# ---------------------------------------------------------------------------
# Bootstrap
# ---------------------------------------------------------------------------


def test_ensure_skills_initialized_creates_dir(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    assert not skills_dir.exists()
    ensure_skills_initialized(skills_dir)
    assert skills_dir.is_dir()
    # Empty by design — no example skill seeded.
    assert list(skills_dir.iterdir()) == []


def test_ensure_skills_initialized_is_idempotent(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    ensure_skills_initialized(skills_dir)
    _make_skill(skills_dir, "web-research")
    # Should NOT wipe existing skills.
    ensure_skills_initialized(skills_dir)
    assert (skills_dir / "web-research" / SKILL_FILENAME).is_file()


# ---------------------------------------------------------------------------
# list_installed_skills
# ---------------------------------------------------------------------------


def test_list_installed_skills_returns_sorted_skillinfo(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    _make_skill(skills_dir, "b-tool", description="second")
    _make_skill(skills_dir, "a-tool", description="first")
    infos = list_installed_skills(skills_dir)
    assert [i.name for i in infos] == ["a-tool", "b-tool"]
    for info in infos:
        assert isinstance(info, SkillInfo)
        assert info.description
        assert info.path.name == SKILL_FILENAME


def test_list_installed_skills_skips_missing_skill_md(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    # Dir without SKILL.md should be skipped, not crash.
    (skills_dir / "empty-skill").mkdir()
    _make_skill(skills_dir, "good")
    infos = list_installed_skills(skills_dir)
    assert [i.name for i in infos] == ["good"]


def test_list_installed_skills_skips_malformed_frontmatter(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()

    bad = skills_dir / "bad"
    bad.mkdir()
    (bad / SKILL_FILENAME).write_text("no frontmatter at all\nbody here", encoding="utf-8")

    bad_yaml = skills_dir / "bad-yaml"
    bad_yaml.mkdir()
    (bad_yaml / SKILL_FILENAME).write_text(
        "---\nname: bad-yaml\ndesc: [unclosed\n---\n", encoding="utf-8"
    )

    _make_skill(skills_dir, "good")

    infos = list_installed_skills(skills_dir)
    assert [i.name for i in infos] == ["good"]


def test_list_installed_skills_skips_name_dir_mismatch(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    # Directory "mismatch" but frontmatter name "other-name" → invalid per deepagents.
    skill_dir = skills_dir / "mismatch"
    skill_dir.mkdir()
    (skill_dir / SKILL_FILENAME).write_text(
        "---\nname: other-name\ndescription: bad mismatch\n---\nbody\n", encoding="utf-8"
    )
    assert list_installed_skills(skills_dir) == []


def test_list_installed_skills_missing_dir_returns_empty(tmp_path: Path) -> None:
    assert list_installed_skills(tmp_path / "no-skills-dir") == []


def test_list_installed_skills_truncates_long_description(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    long_desc = "x" * 500
    _make_skill(skills_dir, "long", description=long_desc)
    infos = list_installed_skills(skills_dir)
    assert len(infos) == 1
    # Truncated to 200 chars + ellipsis.
    assert len(infos[0].description) <= 201
    assert infos[0].description.endswith("…")


# ---------------------------------------------------------------------------
# read_skill_body
# ---------------------------------------------------------------------------


def test_read_skill_body_returns_full_text(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    _make_skill(skills_dir, "web-research", body="Use Google.")
    body = read_skill_body(skills_dir, "web-research")
    assert body is not None
    assert "name: web-research" in body
    assert "Use Google" in body


def test_read_skill_body_missing_returns_none(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    assert read_skill_body(skills_dir, "nonexistent") is None


def test_read_skill_body_empty_name_returns_none(tmp_path: Path) -> None:
    skills_dir = tmp_path / "skills"
    skills_dir.mkdir()
    assert read_skill_body(skills_dir, "") is None


# ---------------------------------------------------------------------------
# user_skills_dir / resolve_skill_sources
# ---------------------------------------------------------------------------


def test_user_skills_dir_under_data_dir(tmp_path: Path) -> None:
    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    sd = user_skills_dir(cfg)
    assert sd.parent == cfg.data_dir
    assert sd.name == "skills"


def test_resolve_skill_sources_returns_user_dir(tmp_path: Path) -> None:
    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    sources = resolve_skill_sources(cfg)
    assert len(sources) == 1
    assert sources[0] == str(user_skills_dir(cfg).resolve())


def test_resolve_skill_sources_with_project_key_returns_both(tmp_path: Path) -> None:
    from my_deepagent.skills import project_skills_dir

    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    sources = resolve_skill_sources(cfg, project_key="proj1234abcdef00")
    assert sources == [
        str(user_skills_dir(cfg).resolve()),
        str(project_skills_dir(cfg, "proj1234abcdef00").resolve()),
    ]


def test_list_all_skills_project_overrides_global(tmp_path: Path) -> None:
    from my_deepagent.skills import list_all_skills, project_skills_dir

    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    pk = "abc123def456ffff"
    global_dir = user_skills_dir(cfg)
    proj_dir = project_skills_dir(cfg, pk)
    global_dir.mkdir(parents=True)
    proj_dir.mkdir(parents=True)
    _make_skill(global_dir, "shared", description="global-version")
    _make_skill(proj_dir, "shared", description="project-version")
    _make_skill(global_dir, "global-only", description="g")
    _make_skill(proj_dir, "project-only", description="p")

    skills = list_all_skills(cfg, pk)
    by_name = {s.name: s for s in skills}
    assert set(by_name.keys()) == {"shared", "global-only", "project-only"}
    # Project overrides global on the shared name.
    assert by_name["shared"].scope == "project"
    assert by_name["shared"].description == "project-version"
    assert by_name["global-only"].scope == "global"
    assert by_name["project-only"].scope == "project"


def test_find_skill_prefers_project_over_global(tmp_path: Path) -> None:
    from my_deepagent.skills import find_skill, project_skills_dir

    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    pk = "f0f0f0f0f0f0f0f0"
    global_dir = user_skills_dir(cfg)
    proj_dir = project_skills_dir(cfg, pk)
    global_dir.mkdir(parents=True)
    proj_dir.mkdir(parents=True)
    _make_skill(global_dir, "dup", description="g")
    _make_skill(proj_dir, "dup", description="p")

    skill = find_skill(cfg, pk, "dup")
    assert skill is not None
    assert skill.scope == "project"
    assert skill.description == "p"


def test_find_skill_missing_returns_none(tmp_path: Path) -> None:
    from my_deepagent.skills import find_skill

    cfg = load_config(workspace_root=tmp_path, data_dir=tmp_path / "data")
    assert find_skill(cfg, "any-project-key", "nonexistent") is None


# ---------------------------------------------------------------------------
# Integration: build_agent threads skills sources to deepagents
# ---------------------------------------------------------------------------


def test_build_agent_passes_skills_sources_to_deepagents(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    from my_deepagent import session as session_mod
    from my_deepagent.persona import Persona

    captured: dict[str, Any] = {}

    def fake_create_deep_agent(**kwargs: Any) -> Any:
        captured.update(kwargs)
        return object()

    monkeypatch.setattr(session_mod, "create_deep_agent", fake_create_deep_agent)

    persona = Persona(
        name="test-persona",
        version=1,
        backend="openrouter",
        model="openrouter:deepseek/deepseek-chat",
        provider_origin="CN/DeepSeek",
        capabilities=("code_edit",),
        max_risk_level="high",
        system_prompt="System prompt for test persona (must be ≥10 chars)",
        deepagents_backend="state",
    )
    cfg = load_config(
        workspace_root=tmp_path,
        data_dir=tmp_path / "data",
        openrouter_api_key="test-key",
    )

    skills_dir = tmp_path / "user-skills"
    ensure_skills_initialized(skills_dir)
    _make_skill(skills_dir, "noop", description="does nothing")

    _agent = session_mod.build_agent(
        persona,
        cfg,
        root_dir=tmp_path,
        skills_sources_override=[str(skills_dir)],
    )
    assert "skills" in captured
    assert captured["skills"] == [str(skills_dir)]


def test_build_agent_skips_skills_kwarg_when_none(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    from my_deepagent import session as session_mod
    from my_deepagent.persona import Persona

    captured: dict[str, Any] = {}

    def fake_create_deep_agent(**kwargs: Any) -> Any:
        captured.update(kwargs)
        return object()

    monkeypatch.setattr(session_mod, "create_deep_agent", fake_create_deep_agent)

    persona = Persona(
        name="test-persona",
        version=1,
        backend="openrouter",
        model="openrouter:deepseek/deepseek-chat",
        provider_origin="CN/DeepSeek",
        capabilities=("code_edit",),
        max_risk_level="high",
        system_prompt="System prompt for test persona (must be ≥10 chars)",
        deepagents_backend="state",
    )
    cfg = load_config(
        workspace_root=tmp_path,
        data_dir=tmp_path / "data",
        openrouter_api_key="test-key",
    )

    _agent = session_mod.build_agent(persona, cfg, root_dir=tmp_path)
    assert "skills" not in captured