from __future__ import annotations

import os
from pathlib import Path

import pytest

from beaver.plugins.hashing import hash_plugin_skill_tree


def test_skill_tree_hash_changes_when_supporting_file_changes(tmp_path: Path) -> None:
    root = tmp_path / "skill"
    root.mkdir()
    (root / "SKILL.md").write_text("# Skill\n", encoding="utf-8")
    (root / "templates").mkdir()
    template = root / "templates" / "report.md"
    template.write_text("v1", encoding="utf-8")

    first = hash_plugin_skill_tree(root)
    template.write_text("v2", encoding="utf-8")
    second = hash_plugin_skill_tree(root)

    assert first.skill_content_hash == second.skill_content_hash
    assert first.skill_tree_hash != second.skill_tree_hash


def test_skill_tree_hash_changes_when_path_changes(tmp_path: Path) -> None:
    root = tmp_path / "skill"
    root.mkdir()
    (root / "SKILL.md").write_text("# Skill\n", encoding="utf-8")
    (root / "a.txt").write_text("same", encoding="utf-8")
    first = hash_plugin_skill_tree(root)

    (root / "b.txt").write_text((root / "a.txt").read_text(encoding="utf-8"), encoding="utf-8")
    (root / "a.txt").unlink()
    second = hash_plugin_skill_tree(root)

    assert first.skill_tree_hash != second.skill_tree_hash


def test_skill_tree_hash_tracks_executable_bit_but_not_other_mode_bits(tmp_path: Path) -> None:
    root = tmp_path / "skill"
    root.mkdir()
    script = root / "script.sh"
    (root / "SKILL.md").write_text("# Skill\n", encoding="utf-8")
    script.write_text("#!/bin/sh\n", encoding="utf-8")
    script.chmod(0o644)
    first = hash_plugin_skill_tree(root)

    script.chmod(0o600)
    non_exec_changed = hash_plugin_skill_tree(root)
    script.chmod(0o700)
    exec_changed = hash_plugin_skill_tree(root)

    assert first.skill_tree_hash == non_exec_changed.skill_tree_hash
    assert first.skill_tree_hash != exec_changed.skill_tree_hash


def test_skill_tree_hash_ignores_mtime_and_beaver_metadata(tmp_path: Path) -> None:
    root = tmp_path / "skill"
    root.mkdir()
    skill = root / "SKILL.md"
    skill.write_text("# Skill\n", encoding="utf-8")
    (root / "version.json").write_text('{"ignored": true}', encoding="utf-8")
    (root / "upstream.json").write_text('{"ignored": true}', encoding="utf-8")
    first = hash_plugin_skill_tree(root)

    os.utime(skill, (skill.stat().st_atime + 20, skill.stat().st_mtime + 20))
    (root / "version.json").write_text('{"ignored": false}', encoding="utf-8")
    (root / "upstream.json").write_text('{"ignored": false}', encoding="utf-8")
    second = hash_plugin_skill_tree(root)

    assert first.skill_tree_hash == second.skill_tree_hash


def test_skill_tree_hash_rejects_symlinks(tmp_path: Path) -> None:
    root = tmp_path / "skill"
    root.mkdir()
    (root / "SKILL.md").write_text("# Skill\n", encoding="utf-8")
    (root / "linked").symlink_to(root / "SKILL.md")

    with pytest.raises(ValueError, match="symlink"):
        hash_plugin_skill_tree(root)