import pytest

from deerflow.agents.middlewares.thread_data_middleware import ThreadDataMiddleware
from deerflow.config.app_config import AppConfig
from deerflow.config.deer_flow_context import DeerFlowContext
from deerflow.config.sandbox_config import SandboxConfig


def _as_posix(path: str) -> str:
    return path.replace("\\", "/")


def _make_context(thread_id: str, run_id: str | None = None) -> DeerFlowContext:
    return DeerFlowContext(
        app_config=AppConfig(sandbox=SandboxConfig(use="test")),
        thread_id=thread_id,
        run_id=run_id,
    )


class TestThreadDataMiddleware:
    def test_before_agent_returns_paths_when_thread_id_present_in_context(self, tmp_path):
        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)
        from langgraph.runtime import Runtime

        result = middleware.before_agent(state={}, runtime=Runtime(context=_make_context("thread-123")))

        assert result is not None
        assert _as_posix(result["thread_data"]["workspace_path"]).endswith("threads/thread-123/user-data/workspace")
        assert _as_posix(result["thread_data"]["uploads_path"]).endswith("threads/thread-123/user-data/uploads")
        assert _as_posix(result["thread_data"]["outputs_path"]).endswith("threads/thread-123/user-data/outputs")

    def test_before_agent_uses_thread_id_from_context(self, tmp_path):
        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)
        from langgraph.runtime import Runtime

        result = middleware.before_agent(state={}, runtime=Runtime(context=_make_context("thread-from-config")))

        assert result is not None
        assert _as_posix(result["thread_data"]["workspace_path"]).endswith("threads/thread-from-config/user-data/workspace")

    def test_before_agent_uses_thread_id_from_typed_context(self, tmp_path):
        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)
        from langgraph.runtime import Runtime

        result = middleware.before_agent(state={}, runtime=Runtime(context=_make_context("thread-from-dict")))

        assert result is not None
        assert _as_posix(result["thread_data"]["uploads_path"]).endswith("threads/thread-from-dict/user-data/uploads")

    def test_before_agent_raises_clear_error_when_thread_id_missing(self, tmp_path):
        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)
        from langgraph.runtime import Runtime

        with pytest.raises(ValueError, match="Thread ID is required"):
            middleware.before_agent(state={}, runtime=Runtime(context=_make_context("")))

    def test_before_agent_stamps_run_id_and_timestamp_on_last_human_message(self, tmp_path):
        """Smoke for the release/2.0-rc + PR merge: run_id from typed
        DeerFlowContext flows into the trailing HumanMessage's
        additional_kwargs alongside an ISO-8601 timestamp."""
        from langchain_core.messages import HumanMessage
        from langgraph.runtime import Runtime

        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)
        original = HumanMessage(content="hello", id="m-1")

        result = middleware.before_agent(
            state={"messages": [original]},
            runtime=Runtime(context=_make_context("t-stamp", run_id="r-stamp")),
        )

        assert result is not None
        stamped = result["messages"][-1]
        assert isinstance(stamped, HumanMessage)
        assert stamped.id == "m-1"
        assert stamped.name == "user-input"
        assert stamped.additional_kwargs["run_id"] == "r-stamp"
        assert "timestamp" in stamped.additional_kwargs

    def test_before_agent_stamps_none_run_id_when_context_omits_it(self, tmp_path):
        """run_id is optional: middleware must still stamp (with None) rather than crash."""
        from langchain_core.messages import HumanMessage
        from langgraph.runtime import Runtime

        middleware = ThreadDataMiddleware(base_dir=str(tmp_path), lazy_init=True)

        result = middleware.before_agent(
            state={"messages": [HumanMessage(content="hi", id="m-2")]},
            runtime=Runtime(context=_make_context("t-no-run")),
        )

        assert result is not None
        stamped = result["messages"][-1]
        assert stamped.additional_kwargs["run_id"] is None