"""
Tests for the caching and tombstone behaviors added to PluginStoreManager
to fix the plugin-list slowness and the uninstall-resurrection bugs.

Coverage targets:
- ``mark_recently_uninstalled`` / ``was_recently_uninstalled`` lifecycle and
  TTL expiry.
- ``_get_local_git_info`` mtime-gated cache: ``git`` subprocesses only run
  when ``.git/HEAD`` mtime changes.
- ``fetch_registry`` stale-cache fallback on network failure.
"""

import os
import time
import unittest
from pathlib import Path
from tempfile import TemporaryDirectory
from unittest.mock import patch, MagicMock

from src.plugin_system.store_manager import PluginStoreManager


class TestUninstallTombstone(unittest.TestCase):
    def setUp(self):
        self._tmp = TemporaryDirectory()
        self.addCleanup(self._tmp.cleanup)
        self.sm = PluginStoreManager(plugins_dir=self._tmp.name)

    def test_unmarked_plugin_is_not_recent(self):
        self.assertFalse(self.sm.was_recently_uninstalled("foo"))

    def test_marking_makes_it_recent(self):
        self.sm.mark_recently_uninstalled("foo")
        self.assertTrue(self.sm.was_recently_uninstalled("foo"))

    def test_tombstone_expires_after_ttl(self):
        self.sm._uninstall_tombstone_ttl = 0.05
        self.sm.mark_recently_uninstalled("foo")
        self.assertTrue(self.sm.was_recently_uninstalled("foo"))
        time.sleep(0.1)
        self.assertFalse(self.sm.was_recently_uninstalled("foo"))
        # Expired entry should also be pruned from the dict.
        self.assertNotIn("foo", self.sm._uninstall_tombstones)


class TestGitInfoCache(unittest.TestCase):
    def setUp(self):
        self._tmp = TemporaryDirectory()
        self.addCleanup(self._tmp.cleanup)
        self.plugins_dir = Path(self._tmp.name)
        self.sm = PluginStoreManager(plugins_dir=str(self.plugins_dir))

        # Minimal fake git checkout: .git/HEAD needs to exist so the cache
        # key (its mtime) is stable, but we mock subprocess so no actual git
        # is required.
        self.plugin_path = self.plugins_dir / "plg"
        (self.plugin_path / ".git").mkdir(parents=True)
        (self.plugin_path / ".git" / "HEAD").write_text("ref: refs/heads/main\n")

    def _fake_subprocess_run(self, *args, **kwargs):
        # Return different dummy values depending on which git subcommand
        # was invoked so the code paths that parse output all succeed.
        cmd = args[0]
        result = MagicMock()
        result.returncode = 0
        if "rev-parse" in cmd and "HEAD" in cmd and "--abbrev-ref" not in cmd:
            result.stdout = "abcdef1234567890\n"
        elif "--abbrev-ref" in cmd:
            result.stdout = "main\n"
        elif "config" in cmd:
            result.stdout = "https://example.com/repo.git\n"
        elif "log" in cmd:
            result.stdout = "2026-04-08T12:00:00+00:00\n"
        else:
            result.stdout = ""
        return result

    def test_cache_hits_avoid_subprocess_calls(self):
        with patch(
            "src.plugin_system.store_manager.subprocess.run",
            side_effect=self._fake_subprocess_run,
        ) as mock_run:
            first = self.sm._get_local_git_info(self.plugin_path)
            self.assertIsNotNone(first)
            self.assertEqual(first["short_sha"], "abcdef1")
            calls_after_first = mock_run.call_count
            self.assertEqual(calls_after_first, 4)

            # Second call with unchanged HEAD: zero new subprocess calls.
            second = self.sm._get_local_git_info(self.plugin_path)
            self.assertEqual(second, first)
            self.assertEqual(mock_run.call_count, calls_after_first)

    def test_cache_invalidates_on_head_mtime_change(self):
        with patch(
            "src.plugin_system.store_manager.subprocess.run",
            side_effect=self._fake_subprocess_run,
        ) as mock_run:
            self.sm._get_local_git_info(self.plugin_path)
            calls_after_first = mock_run.call_count

            # Bump mtime on .git/HEAD to simulate a new commit being checked out.
            head = self.plugin_path / ".git" / "HEAD"
            new_time = head.stat().st_mtime + 10
            os.utime(head, (new_time, new_time))

            self.sm._get_local_git_info(self.plugin_path)
            self.assertEqual(mock_run.call_count, calls_after_first + 4)

    def test_no_git_directory_returns_none(self):
        non_git = self.plugins_dir / "no_git"
        non_git.mkdir()
        self.assertIsNone(self.sm._get_local_git_info(non_git))


class TestRegistryStaleCacheFallback(unittest.TestCase):
    def setUp(self):
        self._tmp = TemporaryDirectory()
        self.addCleanup(self._tmp.cleanup)
        self.sm = PluginStoreManager(plugins_dir=self._tmp.name)

    def test_network_failure_returns_stale_cache(self):
        # Prime the cache with a known-good registry.
        self.sm.registry_cache = {"plugins": [{"id": "cached"}]}
        self.sm.registry_cache_time = time.time() - 10_000  # very old
        self.sm.registry_cache_timeout = 1  # force re-fetch attempt

        import requests as real_requests
        with patch.object(
            self.sm,
            "_http_get_with_retries",
            side_effect=real_requests.RequestException("boom"),
        ):
            result = self.sm.fetch_registry()

        self.assertEqual(result, {"plugins": [{"id": "cached"}]})

    def test_network_failure_with_no_cache_returns_empty(self):
        self.sm.registry_cache = None
        import requests as real_requests
        with patch.object(
            self.sm,
            "_http_get_with_retries",
            side_effect=real_requests.RequestException("boom"),
        ):
            result = self.sm.fetch_registry()
        self.assertEqual(result, {"plugins": []})


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