import base64
import importlib.util
import io
import json
from pathlib import Path
import tempfile
import unittest
from unittest.mock import patch

spec = importlib.util.spec_from_file_location("ec_agent", Path(__file__).resolve().parents[1] / "ec_agent.py")
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
Agent, AgentError, Held, Journal = module.Agent, module.AgentError, module.Held, module.Journal
INSTANCE = "a53d99da-a1eb-4f01-9b10-a6268b556542"


class FakeDocker:
    def __init__(self):
        self.containers = {}
        self.calls = []
        self.fail_restart = False
        self.lose_reply_after = None
        self.started = 0

    def inspect(self, name):
        return self.containers.get(name)

    def call(self, *args, **kwargs):
        self.calls.append(args)
        if args[0] == "info":
            return json.dumps({"ServerVersion": "27.5.1"})
        if args[:2] == ("image", "ls"):
            return "ghcr.io/ayymoss/plutainer:latest\n"
        if args[:2] == ("container", "create"):
            labels = {args[index + 1].split("=", 1)[0]: args[index + 1].split("=", 1)[1] for index, arg in enumerate(args) if arg == "--label"}
            name = args[args.index("--name") + 1]
            self.containers[name] = {"Id": "container-123", "Config": {"Labels": labels}, "State": {"Status": "created", "Running": False}}
        if args[:2] in (("container", "start"), ("container", "restart")):
            if self.fail_restart and args[1] == "restart":
                raise AgentError("Docker command unavailable or timed out")
            self.started += 1
            self.containers[args[-1]]["State"] = {"Status": "running", "Running": True, "StartedAt": f"started-{self.started}"}
        if args[:2] == ("container", "stop"):
            self.containers[args[-1]]["State"] = {"Status": "exited", "Running": False}
        if args[:2] == ("container", "rm"):
            self.containers.pop(args[-1])
        if args[0] == "container" and args[1] == self.lose_reply_after:
            raise AgentError("Docker command unavailable or timed out")
        return ""


class Response(io.BytesIO):
    def __init__(self, content, status=200, headers=None):
        super().__init__(content)
        self.status = status
        self.headers = headers or {}


class AgentTests(unittest.TestCase):
    def setUp(self):
        self.temp = tempfile.TemporaryDirectory()
        self.config = {"root": self.temp.name, "controller": "https://controller.example", "credential": "secret", "portRange": {"min": 28960, "max": 28980}}
        self.docker = FakeDocker()
        self.agent = Agent(self.config, self.docker)
        self.library_id = "library-one"
        self.library = self.agent.library_dir("t5", self.library_id)
        (self.library / "content").mkdir(parents=True)
        (self.library / "content" / "game.ff").write_bytes(b"game-data")
        files = [{"path": "game.ff", "size": 9, "sha256": module.digest(b"game-data")}]
        module.atomic_json(self.library / "manifest.json", {"libraryId": self.library_id, "game": "t5", "size": 9, "files": files, "manifestSha256": module.digest(json.dumps(files, separators=(",", ":")).encode())})

    def tearDown(self):
        self.agent.journal.close()
        self.temp.cleanup()

    def operation(self, kind, payload=None, op_id="operation-1", generation=1):
        return {"id": op_id, "kind": kind, "instanceId": INSTANCE, "generation": generation, "payload": payload or {}}

    def create(self):
        payload = {"name": "t5_zombie_test_1", "game": "t5", "libraryId": self.library_id, "image": "ghcr.io/ayymoss/plutainer:latest", "port": 28960, "env": {"PLUTAINER_PORT": "28960"}, "rconPassword": "rcon-secret", "files": [{"path": "configs/server.cfg", "contentBase64": base64.b64encode(b"original").decode()}]}
        result = self.agent.execute(self.operation("instance.create", payload, "create"))
        self.assertEqual(result["state"], "completed", result)
        return payload

    def test_same_id_reports_saved_result_without_executing_again(self):
        self.create()
        operation = self.operation("instance.restart")
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        first = self.agent.execute(operation)
        self.assertEqual(first["state"], "completed")
        second = self.agent.execute({**operation, "state": "running", "updatedAt": "later", "result": None})
        self.assertEqual(second["result"], first["result"])
        self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), 1)

    def test_reusing_id_with_different_payload_is_rejected(self):
        self.agent.execute(self.operation("host.inspect"))
        with self.assertRaisesRegex(AgentError, "different content"):
            self.agent.execute(self.operation("host.inspect", {"changed": True}))

    def test_agent_restart_marks_running_unknown_and_never_replays(self):
        operation = self.operation("instance.restart")
        self.agent.journal.accept(operation)
        self.agent.journal.update(operation["id"], "running")
        self.agent.journal.close()
        self.agent = Agent(self.config, self.docker)
        result = self.agent.execute(operation)
        self.assertEqual(result["state"], "unknown")
        self.assertEqual(self.docker.calls, [])

    def test_occupied_and_unknown_wait_then_revalidate_same_operation(self):
        self.create()
        operation = self.operation("instance.restart")
        for players in (2, None, 7):
            self.agent.rcon = lambda *_, count=players: {"ok": True, "players": count}
            result = self.agent.execute(operation)
            self.assertEqual(result["state"], "accepted")
            self.assertFalse(any(call[:2] == ("container", "restart") for call in self.docker.calls))
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.assertEqual(self.agent.execute(operation)["state"], "completed")

    def test_unknown_container_health_cannot_disrupt(self):
        self.create()
        self.docker.containers[self.agent.container_name(INSTANCE, 1)]["State"] = {"Status": "unknown", "Running": False}
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.assertEqual(self.agent.execute(self.operation("instance.stop"))["state"], "accepted")
        self.assertFalse(any(call[:2] == ("container", "stop") for call in self.docker.calls))

    def test_files_stage_is_nondisruptive_activation_snapshots_and_rollback(self):
        self.create()
        target = self.agent.instance_dir(INSTANCE, 1) / "app/configs/server.cfg"
        staged = {"stageId": "campaign", "files": [{"id": 9, "path": "configs/server.cfg", "contentBase64": base64.b64encode(b"new").decode(), "sha256": module.digest(b"new"), "checkBefore": True, "expectedBeforeSha": module.digest(b"original")}]}
        self.agent.execute(self.operation("files.stage", staged, "stage"))
        self.assertEqual(target.read_bytes(), b"original")
        self.agent.rcon = lambda *_: {"ok": True, "players": 3}
        operation = self.operation("instance.restart", {"stageId": "campaign"})
        self.assertEqual(self.agent.execute(operation)["state"], "accepted")
        self.assertEqual(target.read_bytes(), b"original")
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        result = json.loads(self.agent.execute(operation)["result"])
        self.assertEqual(base64.b64decode(result["before"][0]["contentBase64"]), b"original")
        self.assertEqual(target.read_bytes(), b"new")
        rollback = self.agent.execute(self.operation("files.rollback", {"stageId": "campaign", "restart": False}, "rollback"))
        self.assertEqual(rollback["state"], "completed")
        self.assertEqual(target.read_bytes(), b"original")

    def test_changed_target_fails_before_activation_or_restart(self):
        self.create()
        target = self.agent.instance_dir(INSTANCE, 1) / "app/configs/server.cfg"
        self.agent.execute(self.operation("files.stage", {"stageId": "campaign", "files": [{"path": "configs/server.cfg", "contentBase64": base64.b64encode(b"new").decode(), "checkBefore": True, "expectedBeforeSha": "0" * 64}]}, "stage"))
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        result = self.agent.execute(self.operation("instance.restart", {"stageId": "campaign"}))
        self.assertEqual(result["state"], "failed")
        self.assertEqual(target.read_bytes(), b"original")
        self.assertFalse(any(call[:2] == ("container", "restart") for call in self.docker.calls))

    def test_ambiguous_restart_keeps_before_images_on_disk_and_is_not_replayed(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.agent.execute(self.operation("files.stage", {"stageId": "campaign", "files": [{"path": "configs/server.cfg", "contentBase64": base64.b64encode(b"new").decode()}]}, "stage"))
        self.docker.fail_restart = True
        operation = self.operation("instance.restart", {"stageId": "campaign"})
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        self.agent.execute(operation)
        self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), 1)
        saved = json.loads((self.agent.instance_dir(INSTANCE, 1) / "stages/campaign/manifest.json").read_text())
        self.assertEqual(saved["state"], "activated")
        self.assertEqual(base64.b64decode(saved["before"][0]["contentBase64"]), b"original")

    def test_remove_only_own_instance_and_preserves_shared_library(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        result = self.agent.execute(self.operation("instance.remove"))
        self.assertEqual(result["state"], "completed")
        self.assertTrue((self.library / "content/game.ff").exists())
        self.assertFalse(self.agent.instance_dir(INSTANCE, 1).exists())

    def test_unowned_container_never_mutated(self):
        self.create()
        self.docker.containers[self.agent.container_name(INSTANCE, 1)]["Config"]["Labels"] = {}
        self.assertEqual(self.agent.execute(self.operation("instance.remove"))["state"], "failed")
        self.assertFalse(any(call[:2] == ("container", "stop") for call in self.docker.calls))

    def test_rebuild_moves_generation_and_rejects_old_commands(self):
        payload = self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        result = self.agent.execute(self.operation("instance.rebuild", {**payload, "nextGeneration": 2}))
        self.assertEqual(result["state"], "completed", result)
        self.assertEqual(json.loads(result["result"])["generation"], 2)
        self.assertEqual(self.agent.execute(self.operation("instance.stop", op_id="old-stop"))["state"], "failed")
        self.assertTrue(self.agent.inspect(INSTANCE, 2)["running"])

    def test_traversal_and_symlinks_are_rejected(self):
        self.create()
        app = self.agent.instance_dir(INSTANCE, 1) / "app"
        (app / "escape").symlink_to(self.temp.name)
        for path in ("../spec.json", "/etc/passwd", "escape/secret", "configs/../../spec.json"):
            with self.assertRaises(AgentError):
                module.scoped(app, path)

    def manifest(self, content=b"complete-game-file"):
        files = [{"path": "zone/test.ff", "size": len(content), "sha256": module.digest(content)}]
        return {"id": "downloaded", "game": "t6", "files": files, "sizeBytes": len(content), "manifestSha256": module.digest(json.dumps(files, separators=(",", ":")).encode())}

    def test_resume_verifies_and_atomically_publishes_library(self):
        content = b"complete-game-file"
        manifest = self.manifest(content)
        staging = self.agent.root / "libraries/t6/.downloaded.partial/content/zone"
        staging.mkdir(parents=True)
        (staging / "test.ff").write_bytes(content[:8])
        calls = []
        def fetch(method, path, data=None, extra_headers=None):
            calls.append((path, extra_headers))
            if path == "/manifest":
                return Response(json.dumps(manifest).encode())
            return Response(content[8:], 206, {"Content-Range": f"bytes 8-{len(content)-1}/{len(content)}"})
        self.agent.artifact_open = fetch
        result = self.agent.library_download({"libraryVersionId": "downloaded", "manifestUrl": "/manifest", "filesBaseUrl": "/files"})
        self.assertEqual(result["state"], "ready")
        self.assertEqual(calls[1][1], {"Range": "bytes=8-"})
        self.assertEqual((self.agent.library_dir("t6", "downloaded") / "content/zone/test.ff").read_bytes(), content)
        self.assertEqual(self.agent.inventory()["libraryCaches"][-1]["status"], "ready")

    def test_corrupt_or_incomplete_library_never_promoted(self):
        manifest = self.manifest()
        def fetch(method, path, data=None, extra_headers=None):
            return Response(json.dumps(manifest).encode() if path == "/manifest" else b"corrupt")
        self.agent.artifact_open = fetch
        with self.assertRaisesRegex(AgentError, "integrity"):
            self.agent.library_download({"libraryVersionId": "downloaded", "manifestUrl": "/manifest", "filesBaseUrl": "/files"})
        self.assertFalse(self.agent.library_dir("t6", "downloaded").exists())
        self.assertEqual(self.agent.library_progress["downloaded"]["status"], "failed")

    def test_manifest_tampering_rejected_before_download(self):
        manifest = self.manifest()
        manifest["files"][0]["size"] = 999
        self.agent.artifact_open = lambda *_: Response(json.dumps(manifest).encode())
        with self.assertRaisesRegex(AgentError, "manifest checksum"):
            self.agent.library_download({"libraryVersionId": "downloaded", "manifestUrl": "/manifest", "filesBaseUrl": "/files"})

    def test_artifact_urls_never_leak_credentials_to_other_origins(self):
        for value in ("https://attacker.example/files", "//attacker.example/files", "http://controller.example/files", "https://user:pass@controller.example/files"):
            with self.assertRaises(AgentError):
                self.agent.artifact_url(value)

    def test_unsupported_operation_does_not_spawn_shell(self):
        result = self.agent.execute(self.operation("shell.execute", {"command": "touch /tmp/unsafe"}))
        self.assertEqual(result["state"], "failed")
        self.assertEqual(self.docker.calls, [])

    def test_restart_lost_acknowledgement_recovers_from_changed_start_timestamp(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.docker.lose_reply_after = "restart"
        operation = self.operation("instance.restart")
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        self.agent.journal.close()
        self.agent = Agent(self.config, self.docker)
        recovered = self.agent.execute(operation)
        self.assertEqual(recovered["state"], "completed")
        self.assertTrue(json.loads(recovered["result"])["reconciled"])
        self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), 1)

    def test_created_container_lost_start_reply_reconciles_immutable_operation_label(self):
        payload = {"name": "t5_zombie_test_1", "game": "t5", "libraryId": self.library_id, "image": "ghcr.io/ayymoss/plutainer:latest", "port": 28960, "env": {}, "rconPassword": "secret", "files": []}
        self.docker.lose_reply_after = "start"
        operation = self.operation("instance.create", payload)
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        result = self.agent.execute(operation)
        self.assertEqual(result["state"], "completed")
        self.assertEqual(sum(call[:2] == ("container", "create") for call in self.docker.calls), 1)

    def test_remove_lost_reply_reconciles_absence_without_duplicate_delete(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.docker.lose_reply_after = "rm"
        operation = self.operation("instance.remove")
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        self.assertEqual(self.agent.execute(operation)["state"], "completed")
        self.assertFalse(self.agent.instance_dir(INSTANCE, 1).exists())
        self.assertEqual(sum(call[:2] == ("container", "rm") for call in self.docker.calls), 1)

    def test_rotation_recovers_lost_reply_using_durably_saved_pending_credential(self):
        self.agent.config_path = str(Path(self.temp.name) / "agent.json")
        accepted = {}
        def request(method, path, payload):
            if not accepted:
                accepted["credential"] = payload["credential"]
                persisted = json.loads(Path(self.agent.config_path).read_text())
                self.assertEqual(persisted["pendingCredential"], payload["credential"])
                raise AgentError("Controller request failed")
            self.assertEqual(self.agent.config["credential"], accepted["credential"])
            return {"ok": True}
        self.agent.request = request
        result = self.agent.execute(self.operation("credentials.rotate"))
        self.assertEqual(result["state"], "completed")
        saved = json.loads(Path(self.agent.config_path).read_text())
        self.assertNotIn("pendingCredential", saved)
        self.assertEqual(saved["credential"], accepted["credential"])

    def test_status_parser_never_treats_partial_or_unfamiliar_rows_as_empty(self):
        header = "map: zombie_cosmodrome\nnum score ping guid name\n"
        self.assertIsNone(module.status_players(header))
        self.assertEqual(module.status_players(header + "--- ----- ---- ---- ----\n"), 0)
        for row in ("0 0 CNCT abc player", "1 90 ZMBI abc player", "2 4 ???? abc player"):
            self.assertEqual(module.status_players(header + "--- ----- ---- ---- ----\n" + row), 1)
        self.assertIsNone(module.status_players(header + "--- ----- ---- ---- ----\nconnection in progress"))
        self.assertEqual(module.status_players('statusResponse\n\\mapname\\mp_kino\\sv_maxclients\\4\n10 45 "joe"'), 1)

    def test_udp_rcon_uses_host_local_endpoint_and_returns_structured_occupancy(self):
        self.create()
        class FakeSocket:
            def __enter__(self): return self
            def __exit__(self, *_): pass
            def settimeout(self, value): pass
            def connect(self, endpoint): self.endpoint = endpoint
            def send(self, packet): self.packet = packet
            def recv(self, _size):
                if getattr(self, "done", False): raise module.socket.timeout()
                self.done = True
                return b"\xff\xff\xff\xffprint\nmap: mp_kino\nnum score ping guid name\n--- ----- ---- ---- ----\n0 42 CNCT abc player\n"
        sock = FakeSocket()
        with patch.object(module.socket, "socket", return_value=sock):
            result = self.agent.rcon(INSTANCE, 1, "status")
        self.assertEqual(sock.endpoint, ("127.0.0.1", 28960))
        self.assertTrue(sock.packet.startswith(b"\xff\xff\xff\xffrcon rcon-secret status"))
        self.assertEqual(result["players"], 1)
        self.assertTrue(result["ok"])

    def test_invalid_rebuild_preflight_preserves_running_original(self):
        payload = self.create()
        result = self.agent.execute(self.operation("instance.rebuild", {**payload, "image": "--privileged", "nextGeneration": 2}))
        self.assertEqual(result["state"], "failed")
        self.assertTrue(self.agent.inspect(INSTANCE, 1)["running"])
        self.assertFalse(any(call[:2] == ("container", "stop") for call in self.docker.calls))

    def test_file_operation_resists_parent_symlink_swap_after_validation(self):
        self.create()
        app = self.agent.instance_dir(INSTANCE, 1) / "app"
        outside = Path(self.temp.name) / "outside"
        outside.mkdir()
        (outside / "server.cfg").write_bytes(b"host-data")
        original = module.scoped
        def swap(root, path, **kwargs):
            result = original(root, path, **kwargs)
            (app / "configs").rename(app / "saved-configs")
            (app / "configs").symlink_to(outside)
            return result
        with patch.object(module, "scoped", side_effect=swap):
            with self.assertRaises(OSError):
                module.managed_write(app, "configs/server.cfg", b"escape-attempt")
        self.assertEqual((outside / "server.cfg").read_bytes(), b"host-data")

    def test_deleting_absent_file_with_absent_parent_is_idempotent(self):
        self.create()
        app = self.agent.instance_dir(INSTANCE, 1) / "app"
        module.managed_write(app, "missing/subdirectory/file.gsc", None)
        self.assertFalse((app / "missing").exists())

    def test_controller_contact_failure_holds_before_running_any_docker_command(self):
        self.create()
        count = len(self.docker.calls)
        self.agent.report = lambda *_: (_ for _ in ()).throw(AgentError("Controller request failed"))
        result = self.agent.execute(self.operation("instance.stop"), report_running=True)
        self.assertEqual(result["state"], "accepted")
        self.assertEqual(len(self.docker.calls), count)

    def test_async_import_publication_resumes_after_controller_restart(self):
        responses = iter([{"status": "verifying"}, {"status": "pending"}, {"status": "verifying"}, {"status": "published", "version": {"id": "library-one"}}])
        methods = []
        def request(method, path, *args):
            methods.append(method)
            return Response(json.dumps(next(responses)).encode())
        self.agent.artifact_open = request
        with patch.object(self.agent.stopping, "wait", return_value=False):
            result = self.agent.complete_import({"completeUrl": "/complete"}, start=True)
        self.assertEqual(result["status"], "published")
        self.assertEqual(methods, ["POST", "GET", "POST", "GET"])

    def test_digest_pinned_runtime_inventory_and_exact_aliases(self):
        image_digest = "sha256:" + "1" * 64
        image_id = "sha256:" + "2" * 64
        original = self.docker.call
        def call(*args, **kwargs):
            if args[:2] == ("image", "ls"):
                return f"ghcr.io/ayymoss/plutainer|latest|{image_digest}|{image_id}\n"
            return original(*args, **kwargs)
        self.docker.call = call
        module.atomic_json(self.agent.root / "agent/runtime-images.json", {"ghcr.io/ayymoss/plutainer": image_id, "removed-image": "missing-id"})
        images = self.agent.inventory()["runtimeImages"]
        self.assertIn("ghcr.io/ayymoss/plutainer@" + image_digest, images)
        self.assertIn("ghcr.io/ayymoss/plutainer:latest", images)
        self.assertIn("ghcr.io/ayymoss/plutainer", images)
        self.assertNotIn("removed-image", images)

    def test_heartbeat_applies_configured_host_port_range_before_deployment(self):
        self.agent.request = lambda *_: {"host": {"portMin": 30000, "portMax": 30100}}
        self.agent.heartbeat()
        self.assertEqual(self.agent.config["portRange"], {"min": 30000, "max": 30100})

    def test_download_content_permissions_allow_container_read_access_with_private_umask(self):
        content = b"complete-game-file"
        manifest = self.manifest(content)
        self.agent.artifact_open = lambda method, path, **kwargs: Response(json.dumps(manifest).encode() if path == "/manifest" else content)
        previous = module.os.umask(0o077)
        try:
            self.agent.library_download({"libraryVersionId": "downloaded", "manifestUrl": "/manifest", "filesBaseUrl": "/files"})
        finally:
            module.os.umask(previous)
        content_root = self.agent.library_dir("t6", "downloaded") / "content"
        self.assertEqual(content_root.stat().st_mode & 0o777, 0o555)
        self.assertEqual((content_root / "zone").stat().st_mode & 0o777, 0o555)
        self.assertEqual((content_root / "zone/test.ff").stat().st_mode & 0o777, 0o444)

    def test_agent_restart_resumes_same_immutable_library_operation(self):
        content = b"complete-game-file"
        manifest = self.manifest(content)
        payload = {"libraryVersionId": "downloaded", "manifestUrl": "/manifest", "filesBaseUrl": "/files", "manifestSha256": manifest["manifestSha256"]}
        operation = self.operation("library.download", payload)
        self.agent.journal.accept(operation)
        self.agent.journal.update(operation["id"], "running")
        staging = self.agent.root / "libraries/t6/.downloaded.partial/content/zone"
        staging.mkdir(parents=True)
        (staging / "test.ff").write_bytes(content[:8])
        self.agent.journal.close()
        self.agent = Agent(self.config, self.docker)
        def fetch(method, path, data=None, extra_headers=None):
            if path == "/manifest":
                return Response(json.dumps(manifest).encode())
            self.assertEqual(extra_headers, {"Range": "bytes=8-"})
            return Response(content[8:], 206, {"Content-Range": f"bytes 8-{len(content)-1}/{len(content)}"})
        self.agent.artifact_open = fetch
        result = self.agent.execute(operation)
        self.assertEqual(result["state"], "completed")
        self.assertEqual((self.agent.library_dir("t6", "downloaded") / "content/zone/test.ff").read_bytes(), content)

    def test_player_join_during_activation_holds_restart_without_reapplying_files(self):
        self.create()
        target = self.agent.instance_dir(INSTANCE, 1) / "app/configs/server.cfg"
        original_write = module.managed_write
        for index, kind in enumerate(("instance.restart", "files.activate", "instance.start")):
            with self.subTest(kind=kind):
                before = target.read_bytes()
                stage_id = "late-join-" + str(index)
                content = ("new-" + str(index)).encode()
                self.agent.execute(self.operation("files.stage", {"stageId": stage_id, "files": [{"id": index, "path": "configs/server.cfg", "contentBase64": base64.b64encode(content).decode()}]}, "stage-late-" + str(index)))
                joined, writes = [False], []
                self.agent.rcon = lambda *_: {"ok": True, "players": 1 if joined[0] else 0}
                def write_then_join(*args, **kwargs):
                    original_write(*args, **kwargs)
                    writes.append(args)
                    joined[0] = True
                operation = self.operation(kind, {"stageId": stage_id}, "action-late-" + str(index))
                restarts_before = sum(call[:2] == ("container", "restart") for call in self.docker.calls)
                with patch.object(module, "managed_write", side_effect=write_then_join):
                    held = self.agent.execute(operation)
                    self.assertEqual(held["state"], "accepted")
                    self.assertEqual(json.loads(held["result"])["blocked"], "occupied")
                    self.assertEqual(target.read_bytes(), content)
                    self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), restarts_before)
                    joined[0] = False
                    completed = self.agent.execute(operation)
                self.assertEqual(completed["state"], "completed")
                self.assertEqual(len(writes), 1)
                self.assertEqual(base64.b64decode(json.loads(completed["result"])["before"][0]["contentBase64"]), before)
                self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), restarts_before + 1)

    def test_player_join_during_rollback_holds_restart_without_repeating_restore(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.agent.execute(self.operation("files.stage", {"stageId": "rollback-join", "files": [{"path": "configs/server.cfg", "contentBase64": base64.b64encode(b"new").decode()}]}, "stage-rollback-join"))
        self.agent.execute(self.operation("files.activate", {"stageId": "rollback-join", "restart": False}, "activate-rollback-join"))
        joined, writes = [False], []
        original_write = module.managed_write
        self.agent.rcon = lambda *_: {"ok": True, "players": 1 if joined[0] else 0}
        def restore_then_join(*args, **kwargs):
            original_write(*args, **kwargs)
            writes.append(args)
            joined[0] = True
        operation = self.operation("files.rollback", {"stageId": "rollback-join"}, "rollback-join")
        with patch.object(module, "managed_write", side_effect=restore_then_join):
            self.assertEqual(self.agent.execute(operation)["state"], "accepted")
            self.assertFalse(any(call[:2] == ("container", "restart") for call in self.docker.calls))
            joined[0] = False
            self.assertEqual(self.agent.execute(operation)["state"], "completed")
        self.assertEqual(len(writes), 1)
        self.assertEqual((self.agent.instance_dir(INSTANCE, 1) / "app/configs/server.cfg").read_bytes(), b"original")

    def test_start_with_stage_does_not_reconcile_success_before_required_restart(self):
        self.create()
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.agent.execute(self.operation("files.stage", {"stageId": "start-stage", "files": [{"path": "configs/server.cfg", "contentBase64": base64.b64encode(b"new").decode()}]}, "stage-start"))
        self.docker.fail_restart = True
        operation = self.operation("instance.start", {"stageId": "start-stage"})
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        self.assertEqual(self.agent.execute(operation)["state"], "unknown")
        self.assertEqual(sum(call[:2] == ("container", "restart") for call in self.docker.calls), 1)

    def test_running_unhealthy_container_uses_fresh_occupancy_before_recovery(self):
        self.create()
        self.docker.containers[self.agent.container_name(INSTANCE, 1)]["State"]["Health"] = {"Status": "unhealthy"}
        operation = self.operation("instance.restart")
        self.agent.rcon = lambda *_: {"ok": True, "players": 2}
        self.assertEqual(self.agent.execute(operation)["state"], "accepted")
        self.agent.rcon = lambda *_: {"ok": True, "players": 0}
        self.assertEqual(self.agent.execute(operation)["state"], "completed")

    def test_game_log_can_follow_internal_relative_plutainer_symlink(self):
        self.create()
        app = self.agent.instance_dir(INSTANCE, 1) / "app"
        (app / "logs").mkdir()
        (app / "runtime").mkdir()
        (app / "runtime/game.log").write_text("first\nsecond\nthird\n")
        (app / "logs/games_sp.log").symlink_to("../runtime/game.log")
        result = self.agent.execute(self.operation("logs.read", {"path": "logs/games_sp.log", "lines": 2}))
        self.assertEqual(result["state"], "completed")
        self.assertEqual(json.loads(result["result"])["lines"], ["second", "third"])
        with self.assertRaises(AgentError):
            module.managed_write(app, "logs/games_sp.log", b"must-not-write-through-link")

    def test_game_log_rejects_symlink_escaping_instance(self):
        self.create()
        app = self.agent.instance_dir(INSTANCE, 1) / "app"
        (app / "logs").mkdir()
        outside = Path(self.temp.name) / "host-secret"
        outside.write_text("secret")
        (app / "logs/games_sp.log").symlink_to(outside)
        result = self.agent.execute(self.operation("logs.read", {"path": "logs/games_sp.log"}))
        self.assertEqual(result["state"], "failed")
        self.assertIn("outside", result["error"])

    def test_console_log_falls_back_to_owned_docker_output_including_stderr(self):
        self.create()
        original = self.docker.call
        def call(*args, **kwargs):
            if args[:2] == ("container", "logs"):
                self.assertTrue(kwargs["merge_stderr"])
                self.assertEqual(args[-1], self.agent.container_name(INSTANCE, 1))
                return "stdout-line\nstderr-line\n"
            return original(*args, **kwargs)
        self.docker.call = call
        result = self.agent.execute(self.operation("logs.read", {"path": "logs/console.log"}))
        self.assertEqual(result["state"], "completed")
        self.assertEqual(json.loads(result["result"])["lines"], ["stdout-line", "stderr-line"])


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