import tempfile
from pathlib import Path

import pytest

from arena.agent import AgentSession


class RecordingAgent:
    """Records invocations and returns deterministic responses."""

    def __init__(self, response: str = "Built the app.") -> None:
        self.invocations: list[dict] = []
        self._response = response

    def invoke(self, payload: dict, config: dict) -> dict:
        self.invocations.append({"payload": payload, "config": config})
        return {"messages": [{"role": "assistant", "content": self._response}]}


def make_local_session(thread_id: str | None = None) -> AgentSession:
    """Create a real LocalShellBackend session for behavior testing."""
    from deepagents.backends import LocalShellBackend, CompositeBackend, FilesystemBackend

    root = Path(tempfile.mkdtemp(prefix="agent-swarm-test-"))
    (root / "workspace").mkdir(parents=True, exist_ok=True)
    backend = LocalShellBackend(root_dir=root, virtual_mode=True, inherit_env=False)
    backend._workspace_dir = "/workspace"
    agent = RecordingAgent()

    ctx_root = Path(tempfile.mkdtemp(prefix="agent-swarm-ctx-"))
    (ctx_root / "context").mkdir(parents=True, exist_ok=True)
    context_backend = FilesystemBackend(root_dir=ctx_root, virtual_mode=True)
    composite = CompositeBackend(
        default=backend,
        routes={"/context/": context_backend},
    )
    composite._workspace_dir = "/workspace"
    backend.execute("mkdir -p /workspace")
    return AgentSession(
        thread_id=thread_id or "session-1",
        provider="local",
        backend=composite,
        agent=agent,
        workspace_dir="/workspace",
    )