from collections.abc import Callable
from pathlib import Path
from typing import cast

from deerflow.skills.validation import _validate_skill_frontmatter

VALIDATE_SKILL_FRONTMATTER = cast(
    Callable[[Path], tuple[bool, str, str | None]],
    _validate_skill_frontmatter,
)


def _write_skill(skill_dir: Path, frontmatter: str) -> None:
    skill_dir.mkdir(parents=True, exist_ok=True)
    (skill_dir / "SKILL.md").write_text(frontmatter, encoding="utf-8")


def test_validate_skill_frontmatter_allows_standard_optional_metadata(tmp_path: Path) -> None:
    skill_dir = tmp_path / "demo-skill"
    _write_skill(
        skill_dir,
        """---
name: demo-skill
description: Demo skill
version: 1.0.0
author: example.com/demo
compatibility: OpenClaw >= 1.0
license: MIT
---

# Demo Skill
""",
    )

    valid, message, skill_name = VALIDATE_SKILL_FRONTMATTER(skill_dir)

    assert valid is True
    assert message == "Skill is valid!"
    assert skill_name == "demo-skill"


def test_validate_skill_frontmatter_still_rejects_unknown_keys(tmp_path: Path) -> None:
    skill_dir = tmp_path / "demo-skill"
    _write_skill(
        skill_dir,
        """---
name: demo-skill
description: Demo skill
unsupported: true
---

# Demo Skill
""",
    )

    valid, message, skill_name = VALIDATE_SKILL_FRONTMATTER(skill_dir)

    assert valid is False
    assert "unsupported" in message
    assert skill_name is None


def test_validate_skill_frontmatter_reads_utf8_on_windows_locale(tmp_path, monkeypatch) -> None:
    skill_dir = tmp_path / "demo-skill"
    _write_skill(
        skill_dir,
        """---
name: demo-skill
description: "Curly quotes: \u201cutf8\u201d"
---

# Demo Skill
""",
    )

    original_read_text = Path.read_text

    def read_text_with_gbk_default(self, *args, **kwargs):
        kwargs.setdefault("encoding", "gbk")
        return original_read_text(self, *args, **kwargs)

    monkeypatch.setattr(Path, "read_text", read_text_with_gbk_default)

    valid, message, skill_name = VALIDATE_SKILL_FRONTMATTER(skill_dir)

    assert valid is True
    assert message == "Skill is valid!"
    assert skill_name == "demo-skill"