"""Tests for reme common steps with only local dependencies."""

# pylint: disable=protected-access

import asyncio
import os
import tempfile
import warnings

from reme.components.agent_wrapper import BaseAgentWrapper
from reme.components.application_context import ApplicationContext
from reme.components.file_store import LocalFileStore
from reme.schema import FileFrontMatter, FileLink, FileNode, TraverseGraph
from reme.steps.common.add import AddStep
from reme.steps.common.health_check import _file_graph_status
from reme.steps.common.llm_demo import LLMDemoStep
from reme.steps.common.python_execute import PythonExecuteStep
from reme.steps.index import traverse as traverse_mod

warnings.filterwarnings("ignore", category=DeprecationWarning, module="jieba")
warnings.filterwarnings("ignore", category=DeprecationWarning, module="pkg_resources")


class _temp_chdir:
    """chdir to path for the duration of the block; restore on exit."""

    def __init__(self, path):
        self.path = path
        self._old = None

    def __enter__(self):
        self._old = os.getcwd()
        os.chdir(self.path)
        return self

    def __exit__(self, *exc):
        os.chdir(self._old)


def _run(coro):
    """Run an async coroutine on a fresh isolated event loop."""
    asyncio.run(coro)


def _node(
    path: str,
    links: list[tuple[str, str | None]] | None = None,
    *,
    name: str = "",
    description: str = "",
) -> FileNode:
    """Build a FileNode with (target_path, target_anchor) outgoing edges."""
    return FileNode(
        path=path,
        st_mtime=1.0,
        links=[
            FileLink(source_path=path, target_path=target, target_anchor=anchor) for target, anchor in (links or [])
        ],
        front_matter=FileFrontMatter(name=name, description=description),
    )


async def _make_store(nodes: list[FileNode]) -> LocalFileStore:
    """LocalFileStore seeded with the given graph nodes (no files on disk)."""
    store = LocalFileStore(name="t", embedding_store="")
    await store.start()
    if nodes:
        await store.file_graph.upsert_nodes(nodes)
    return store


def _edges(step) -> list[dict]:
    return step.context.response.answer["edges"]


def test_add_step_coerces_numeric_inputs():
    """add accepts numeric strings as numbers, not string concatenation."""

    async def run():
        step = AddStep()
        resp = await step(a="1", b="2.5")
        assert resp.success is True
        assert resp.answer == "3.5"
        assert resp.metadata["result"] == 3.5
        print("✓ test_add_step_coerces_numeric_inputs passed")

    _run(run())


def test_add_step_rejects_invalid_inputs():
    """invalid add arguments should return a failed response instead of throwing or concatenating."""

    async def run():
        step = AddStep()
        resp = await step(a="one", b=2)
        assert resp.success is False
        assert "Invalid add arguments" in resp.answer
        print("✓ test_add_step_rejects_invalid_inputs passed")

    _run(run())


def test_python_execute_step_returns_printed_stdout(tmp_path):
    """python_execute returns stdout as answer and runs under workspace_dir."""

    async def run():
        app_context = ApplicationContext(workspace_dir=str(tmp_path))
        step = PythonExecuteStep(app_context=app_context)
        resp = await step(code="from pathlib import Path\nprint(Path.cwd().name)")
        assert resp.success is True
        assert resp.answer == f"{tmp_path.name}\n"
        assert resp.metadata["returncode"] == 0
        assert resp.metadata["stderr"] == ""
        print("✓ test_python_execute_step_returns_printed_stdout passed")

    _run(run())


def test_python_execute_step_reports_stderr_on_failure():
    """python_execute captures traceback stderr instead of throwing."""

    async def run():
        step = PythonExecuteStep()
        resp = await step(code='raise RuntimeError("boom")')
        assert resp.success is False
        assert resp.metadata["returncode"] != 0
        assert "RuntimeError: boom" in resp.answer
        assert "RuntimeError: boom" in resp.metadata["stderr"]
        print("✓ test_python_execute_step_reports_stderr_on_failure passed")

    _run(run())


def test_python_execute_step_times_out():
    """python_execute converts subprocess timeout into a failed response."""

    async def run():
        step = PythonExecuteStep()
        resp = await step(code="import time\ntime.sleep(1)", timeout=0.01)
        assert resp.success is False
        assert resp.answer == "Python execution timed out after 0.01s"
        assert resp.metadata["timeout"] == 0.01
        print("✓ test_python_execute_step_times_out passed")

    _run(run())


class _FakeAgentWrapper(BaseAgentWrapper):
    """Capture reply kwargs without calling a real model."""

    def __init__(self):
        super().__init__()
        self.last_kwargs = None

    async def reply(self, inputs, **kwargs) -> dict:
        self.last_kwargs = kwargs
        return {"result": "ok"}


def test_llm_demo_always_registers_add_tool():
    """LLM demo always passes the add job as a tool."""

    async def run():
        wrapper = _FakeAgentWrapper()
        step = LLMDemoStep()
        resp = await step(query="hello", agent_wrapper=wrapper)
        assert resp.success is True
        assert wrapper.last_kwargs["job_tools"] == ["add"]
        assert "job_tools" not in resp.metadata
        print("✓ test_llm_demo_always_registers_add_tool passed")

    _run(run())


def test_file_graph_health_reports_neo4j_cached_counts():
    """Neo4j file graph health should not be reported as an empty local graph."""

    class FakeNeo4jGraph:
        """Minimal Neo4j graph stub with cached health counters."""

        is_started = True
        _driver = object()
        _uri = "bolt://example"
        _database = "neo4j"
        _n_nodes = 3
        _n_edges = 4
        _n_virtual = 1

    status = _file_graph_status(FakeNeo4jGraph())
    assert status["n_nodes"] == 3
    assert status["n_edges"] == 4
    assert status["n_virtual"] == 1
    print("✓ test_file_graph_health_reports_neo4j_cached_counts passed")


# ===========================================================================
# Direct unit tests: TraverseStep
# (LocalFileStore, no HTTP server — BFS over wikilink edges)
# ===========================================================================


def test_traverse_forward_depth_1():
    """depth=1 forward returns direct outbound neighbors."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("a.md", [("b.md", None), ("c.md", "intro")]),
                    _node("b.md"),
                    _node("c.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="a.md", direction="forward", depth=1)
            results = _edges(step)
            paths = {r["target"] for r in results}
            assert paths == {"b.md", "c.md"}
            c_edge = next(r for r in results if r["target"] == "c.md")
            assert c_edge["target_anchor"] == "intro"
            assert c_edge["source"] == "a.md"
            assert c_edge["depth"] == 1
            await store.close()
        print("✓ test_traverse_forward_depth_1 passed")

    asyncio.run(run())


def test_traverse_normalizes_windows_seed_path():
    """Windows-style seeds match the graph's portable POSIX path keys."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("topics/a.md", [("topics/b.md", None)]),
                    _node("topics/b.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path=r"topics\a.md", direction="forward", depth=1)
            assert [edge["target"] for edge in _edges(step)] == ["topics/b.md"]
            await store.close()

    asyncio.run(run())


def test_traverse_backward_returns_inlinks():
    """direction=backward walks inbound edges."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("a.md", [("b.md", None)]),
                    _node("c.md", [("b.md", None)]),
                    _node("b.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="b.md", direction="backward", depth=1)
            results = _edges(step)
            assert {(r["source"], r["target"]) for r in results} == {
                ("a.md", "b.md"),
                ("c.md", "b.md"),
            }
            await store.close()
        print("✓ test_traverse_backward_returns_inlinks passed")

    asyncio.run(run())


def test_traverse_depth_2_expands():
    """depth=2 traverses one hop beyond direct neighbors."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("a.md", [("b.md", None)]),
                    _node("b.md", [("c.md", None)]),
                    _node("c.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="a.md", direction="forward", depth=2)
            results = _edges(step)
            depth_map = {r["target"]: r["depth"] for r in results}
            assert depth_map.get("b.md") == 1
            assert depth_map.get("c.md") == 2
            await store.close()
        print("✓ test_traverse_depth_2_expands passed")

    asyncio.run(run())


def test_traverse_short_seed_yields_empty():
    """A short (not relative to the workspace) seed isn't resolved anymore — BFS simply
    finds no edges from a path that doesn't match any graph node."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("topics/Bob.md"),
                    _node("people/Bob.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="Bob", direction="forward", depth=1)
            payload = _edges(step)
            # No error, just empty results because "Bob" isn't a graph key.
            assert payload == []
            await store.close()
        print("✓ test_traverse_short_seed_yields_empty passed")

    asyncio.run(run())


def test_traverse_not_found_seed():
    """A seed not in the graph returns an empty list (no error)."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store([_node("a.md")])
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="topics/ghost.md", direction="forward", depth=1)
            payload = _edges(step)
            assert payload == []
            await store.close()
        print("✓ test_traverse_not_found_seed passed")

    asyncio.run(run())


def test_traverse_both_directions():
    """direction=both walks out- and in-bound; depth=1 returns one hop in each direction."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("upstream.md", [("center.md", None)]),
                    _node("center.md", [("downstream.md", None)]),
                    _node("downstream.md"),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            await step(path="center.md", direction="both", depth=1)
            results = _edges(step)
            assert {(r["source"], r["target"]) for r in results} == {
                ("upstream.md", "center.md"),
                ("center.md", "downstream.md"),
            }
            await store.close()
        print("✓ test_traverse_both_directions passed")

    asyncio.run(run())


def test_traverse_both_preserves_reciprocal_edge_directions():
    """Opposite wikilinks remain two distinct directed graph edges."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node("a.md", [("b.md", None)]),
                    _node("b.md", [("a.md", None)]),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            response = await step(path="a.md", direction="both", depth=1)
            graph = TraverseGraph.model_validate(response.answer)

            assert {(edge.source, edge.target) for edge in graph.edges} == {
                ("a.md", "b.md"),
                ("b.md", "a.md"),
            }
            assert response.metadata == {}
            await store.close()

    asyncio.run(run())


def test_traverse_returns_frontmatter_and_unresolved_nodes():
    """Graph nodes expose labels and distinguish indexed files from dangling targets."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store(
                [
                    _node(
                        "a.md",
                        [("missing.md", "details")],
                        name="Alpha",
                        description="Root note",
                    ),
                ],
            )
            step = traverse_mod.TraverseStep(file_store=store)
            response = await step(path="a.md", direction="forward", depth=1)
            graph = TraverseGraph.model_validate(response.answer)
            nodes = {node.path: node for node in graph.nodes}

            assert graph.version == 1
            assert graph.seeds == ["a.md"]
            assert nodes["a.md"].model_dump() == {
                "id": "a.md",
                "path": "a.md",
                "name": "Alpha",
                "description": "Root note",
                "depth": 0,
                "indexed": True,
            }
            assert nodes["missing.md"].indexed is False
            assert nodes["missing.md"].depth == 1
            assert graph.edges[0].target_anchor == "details"
            await store.close()

    asyncio.run(run())


def test_traverse_depth_zero_returns_only_seed_nodes():
    """A zero-hop traversal is valid and emits no edges."""

    async def run():
        with tempfile.TemporaryDirectory() as tmp, _temp_chdir(tmp):
            store = await _make_store([_node("a.md", [("b.md", None)]), _node("b.md")])
            step = traverse_mod.TraverseStep(file_store=store)
            response = await step(path="a.md", direction="forward", depth=0)
            graph = TraverseGraph.model_validate(response.answer)

            assert [node.path for node in graph.nodes] == ["a.md"]
            assert graph.edges == []
            await store.close()

    asyncio.run(run())


if __name__ == "__main__":
    print("\n=== traverse step tests ===")
    test_traverse_forward_depth_1()
    test_traverse_backward_returns_inlinks()
    test_traverse_depth_2_expands()
    test_traverse_short_seed_yields_empty()
    test_traverse_not_found_seed()
    test_traverse_both_directions()
    test_traverse_both_preserves_reciprocal_edge_directions()
    test_traverse_returns_frontmatter_and_unresolved_nodes()
    test_traverse_depth_zero_returns_only_seed_nodes()
    print("\n所有测试通过!")