from __future__ import annotations

import os
import shutil
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from skiff.registry import external_checkout_path, registry_repo


REPO_ROOT = Path(__file__).resolve().parents[1]


def write_skill(root: Path, name: str) -> Path:
    skill = root / name
    skill.mkdir(parents=True)
    skill.joinpath("SKILL.md").write_text(
        f"---\nname: {name}\ndescription: >-\n"
        f"  Test {name} skill.\n---\n\n# {name}\n",
        encoding="utf-8",
    )
    return skill


class RegistryCollectionTests(unittest.TestCase):
    def setUp(self) -> None:
        self.temp_dir = tempfile.TemporaryDirectory()
        self.home = Path(self.temp_dir.name)
        self.skills_home = self.home / ".skills"
        (self.skills_home / "skills").mkdir(parents=True)

        self.upstream = self.home / "upstream"
        self.first = write_skill(self.upstream / "skills", "first-skill")
        self.second = write_skill(self.upstream / "skills", "second-skill")
        subprocess.run(
            ["git", "init", "-b", "main", str(self.upstream)],
            check=True,
            capture_output=True,
        )
        subprocess.run(["git", "-C", str(self.upstream), "add", "."], check=True)
        subprocess.run(
            [
                "git",
                "-C",
                str(self.upstream),
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-m",
                "initial",
            ],
            check=True,
            capture_output=True,
        )
        self.skills_home.joinpath("registry.yaml").write_text(
            "test-pack:\n"
            f"  repo: {self.upstream}\n"
            "  ref: main\n"
            "  path: skills\n",
            encoding="utf-8",
        )

    def tearDown(self) -> None:
        self.temp_dir.cleanup()

    def run_skiff(self, *args: str) -> subprocess.CompletedProcess[str]:
        env = os.environ.copy()
        env["HOME"] = str(self.home)
        env["PYTHONPATH"] = str(REPO_ROOT)
        return subprocess.run(
            [sys.executable, "-m", "skiff", *args],
            cwd=REPO_ROOT,
            env=env,
            text=True,
            capture_output=True,
            check=False,
        )

    def test_registry_repo_expands_home_relative_local_path(self) -> None:
        with patch.dict(os.environ, {"HOME": str(self.home)}):
            self.assertEqual(
                registry_repo({"repo": "~/.skills"}),
                str(self.skills_home),
            )
            self.assertEqual(
                external_checkout_path("skills", {"repo": "~/.skills"}),
                self.skills_home.resolve(),
            )

    def test_add_collection_installs_every_discovered_skill(self) -> None:
        result = self.run_skiff("add", "test-pack", "-g", "-a", "codex")

        self.assertEqual(result.returncode, 0, result.stderr)
        skill_dir = self.home / ".codex" / "skills"
        self.assertTrue((skill_dir / "first-skill").is_symlink())
        self.assertTrue((skill_dir / "first-skill" / "SKILL.md").is_file())
        self.assertTrue((skill_dir / "second-skill").is_symlink())
        self.assertTrue((skill_dir / "second-skill" / "SKILL.md").is_file())
        self.assertFalse((skill_dir / "test-pack").exists())

    def test_add_qualified_collection_skill_installs_only_that_skill(self) -> None:
        result = self.run_skiff("add", "test-pack/second-skill", "-g", "-a", "codex")

        self.assertEqual(result.returncode, 0, result.stderr)
        skill_dir = self.home / ".codex" / "skills"
        self.assertFalse((skill_dir / "first-skill").exists())
        self.assertTrue((skill_dir / "second-skill").is_symlink())
        self.assertTrue((skill_dir / "second-skill" / "SKILL.md").is_file())

    def test_add_collection_with_registry_source_installs_all(self) -> None:
        result = self.run_skiff(
            "add",
            "test-pack",
            "--source",
            "registry",
            "-g",
            "-a",
            "codex",
        )

        self.assertEqual(result.returncode, 0, result.stderr)
        skill_dir = self.home / ".codex" / "skills"
        self.assertTrue((skill_dir / "first-skill").is_symlink())
        self.assertTrue((skill_dir / "second-skill").is_symlink())

    def test_project_add_records_collection_for_sync(self) -> None:
        project = self.home / "project"
        project.mkdir()

        added = self.run_skiff(
            "add",
            "test-pack/first-skill",
            "--project",
            str(project),
            "-a",
            "codex",
        )
        link = project / ".agents" / "skills" / "first-skill"
        link.unlink()
        shutil.rmtree(self.home / ".local" / "share" / "skills" / "externals")
        synced = self.run_skiff(
            "sync",
            "--project",
            str(project),
            "-a",
            "codex",
        )

        self.assertEqual(added.returncode, 0, added.stderr)
        self.assertIn('registry: "test-pack"', project.joinpath(".skills.yaml").read_text())
        self.assertEqual(synced.returncode, 0, synced.stderr)
        self.assertTrue(link.is_symlink())
        self.assertTrue((link / "SKILL.md").is_file())

    def test_collection_preflight_prevents_partial_install(self) -> None:
        blocked = self.home / ".codex" / "skills" / "second-skill"
        blocked.mkdir(parents=True)

        result = self.run_skiff("add", "test-pack", "-g", "-a", "codex")

        self.assertNotEqual(result.returncode, 0)
        self.assertFalse((self.home / ".codex" / "skills" / "first-skill").exists())
        self.assertTrue(blocked.is_dir())

    def test_remove_collection_removes_all_child_links(self) -> None:
        installed = self.run_skiff("add", "test-pack", "-g", "-a", "codex")
        removed = self.run_skiff("remove", "test-pack", "-g", "-a", "codex")

        self.assertEqual(installed.returncode, 0, installed.stderr)
        self.assertEqual(removed.returncode, 0, removed.stderr)
        skill_dir = self.home / ".codex" / "skills"
        self.assertFalse((skill_dir / "first-skill").exists())
        self.assertFalse((skill_dir / "second-skill").exists())

    def test_status_expands_collection_children(self) -> None:
        installed = self.run_skiff("add", "test-pack", "-g", "-a", "codex")
        status = self.run_skiff("status", "-a", "codex")

        self.assertEqual(installed.returncode, 0, installed.stderr)
        self.assertEqual(status.returncode, 0, status.stderr)
        self.assertIn("[registry:test-pack] first-skill", status.stdout)
        self.assertIn("[registry:test-pack] second-skill", status.stdout)
        self.assertNotIn("[registry] test-pack\n  (未 fetch)", status.stdout)


if __name__ == "__main__":
    unittest.main()