import os
import json
import pytest
import contextvars
import talemate.agents as agents
import pydantic
import talemate.game.engine.nodes.load_definitions  # noqa: F401
import talemate.agents.director  # noqa: F401
import talemate.agents.memory
from talemate.context import ActiveScene
from talemate.tale_mate import Scene
import talemate.agents.tts.voice_library as voice_library
import talemate.instance as instance
from talemate.game.engine.nodes.core import (
    Graph,
    GraphState,
)
import structlog
from talemate.game.engine.nodes.layout import load_graph_from_file
from talemate.game.engine.nodes.registry import import_talemate_node_definitions
from talemate.client import ClientBase
from collections import deque

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
TEST_GRAPH_DIR = os.path.join(BASE_DIR, "data", "graphs")
RESULTS_DIR = os.path.join(BASE_DIR, "data", "graphs", "results")
UPDATE_RESULTS = False

log = structlog.get_logger("talemate.test_graphs")


# This runs once for the entire test session
@pytest.fixture(scope="session", autouse=True)
def load_node_definitions():
    import_talemate_node_definitions()


def load_test_graph(name) -> Graph:
    path = os.path.join(TEST_GRAPH_DIR, f"{name}.json")
    graph, _ = load_graph_from_file(path)
    return graph


def bootstrap_engine():
    voice_library.VOICE_LIBRARY = voice_library.VoiceLibrary(voices={})
    for agent_type in agents.AGENT_CLASSES:
        if agent_type == "memory":
            agent = MockMemoryAgent()
        else:
            agent = agents.AGENT_CLASSES[agent_type]()
        instance.AGENTS[agent_type] = agent


client_reponses = contextvars.ContextVar("client_reponses", default=deque())


class MockClientContext:
    async def __aenter__(self):
        try:
            self.client_reponses = client_reponses.get()
        except LookupError:
            _client_reponses = deque()
            self.token = client_reponses.set(_client_reponses)
            self.client_reponses = _client_reponses

        return self.client_reponses

    async def __aexit__(self, exc_type, exc_value, traceback):
        if hasattr(self, "token"):
            client_reponses.reset(self.token)


class MockMemoryAgent(talemate.agents.memory.MemoryAgent):
    async def add_many(self, items: list[dict]):
        pass

    async def delete(self, filters: dict):
        pass


class MockClient(ClientBase):
    def __init__(self, name: str):
        self.name = name
        self.remote_model_name = "test-model"
        self.current_status = "idle"
        self.prompt_history = []

    @property
    def enabled(self):
        return True

    async def send_prompt(
        self, prompt, kind="conversation", finalize=lambda x: x, retries=2, **kwargs
    ):
        """Override send_prompt to return a pre-defined response instead of calling LLM.

        If no responses are configured, returns an empty string.
        Records the prompt in prompt_history for later inspection.
        """

        response_stack = client_reponses.get()

        self.prompt_history.append({"prompt": prompt, "kind": kind})

        if not response_stack:
            return ""

        return response_stack.popleft()


class MockScene(Scene):
    @property
    def auto_progress(self):
        """
        These tests currently assume that auto_progress is True
        """
        return True


@pytest.fixture
def mock_scene():
    scene = MockScene()
    bootstrap_scene(scene)
    return scene


@pytest.fixture
def mock_scene_with_assets():
    scene = MockScene()
    bootstrap_scene(scene)

    # Load test assets from the test scene file
    test_scene_path = os.path.join(
        BASE_DIR, "data", "scenes", "talemate-laboratory", "talemate-lab.json"
    )
    with open(test_scene_path, "r") as f:
        test_scene_data = json.load(f)

    # Override scenes_dir to point to test data directory
    test_scenes_dir = os.path.join(BASE_DIR, "data", "scenes")
    scene.scenes_dir = lambda: test_scenes_dir
    scene.project_name = "talemate-laboratory"

    # Create library.json file with assets from the scene file
    if "assets" in test_scene_data and "assets" in test_scene_data["assets"]:
        assets_dict = test_scene_data["assets"]["assets"]
        # Ensure assets directory exists
        assets_dir = os.path.join(test_scenes_dir, "talemate-laboratory", "assets")
        os.makedirs(assets_dir, exist_ok=True)

        # Create library.json file
        library_path = os.path.join(assets_dir, "library.json")
        with open(library_path, "w") as f:
            json.dump({"assets": assets_dict}, f, indent=2)

    return scene


def bootstrap_scene(mock_scene):
    bootstrap_engine()
    client = MockClient("test_client")
    for agent in instance.AGENTS.values():
        agent.client = client
        agent.scene = mock_scene

    director = instance.get_agent("director")
    conversation = instance.get_agent("conversation")
    summarizer = instance.get_agent("summarizer")
    editor = instance.get_agent("editor")
    world_state = instance.get_agent("world_state")

    mock_scene.mock_client = client

    return {
        "director": director,
        "conversation": conversation,
        "summarizer": summarizer,
        "editor": editor,
        "world_state": world_state,
    }


def serialize_state(obj):
    """Custom JSON serializer for Pydantic models"""
    if isinstance(obj, pydantic.BaseModel):
        return obj.model_dump()
    raise TypeError(f"Object of type {type(obj)} is not JSON serializable")


def normalize_state(data):
    """Convert Pydantic models to dicts for comparison"""
    if isinstance(data, pydantic.BaseModel):
        return data.model_dump()
    elif isinstance(data, dict):
        return {k: normalize_state(v) for k, v in data.items()}
    elif isinstance(data, list):
        return [normalize_state(item) for item in data]
    return data


def make_assert_fn(name: str, write_results: bool = False):
    async def assert_fn(state: GraphState):
        if write_results or not os.path.exists(
            os.path.join(RESULTS_DIR, f"{name}.json")
        ):
            with open(os.path.join(RESULTS_DIR, f"{name}.json"), "w") as f:
                json.dump(state.shared, f, indent=4, default=serialize_state)
        else:
            with open(os.path.join(RESULTS_DIR, f"{name}.json"), "r") as f:
                expected = json.load(f)

            # Normalize state.shared to convert Pydantic models to dicts for comparison
            normalized_shared = normalize_state(state.shared)
            assert normalized_shared == expected

    return assert_fn


def make_graph_test(name: str, write_results: bool = False):
    async def test_graph(scene):
        assert_fn = make_assert_fn(name, write_results)

        def error_handler(state, error: Exception):
            raise error

        with ActiveScene(scene):
            graph = load_test_graph(name)
            assert graph is not None
            graph.callbacks.append(assert_fn)
            graph.error_handlers.append(error_handler)
            await graph.execute()

    return test_graph


@pytest.mark.asyncio
async def test_graph_core(mock_scene):
    fn = make_graph_test("test-harness-core", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_data(mock_scene):
    fn = make_graph_test("test-harness-data", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_scene(mock_scene):
    fn = make_graph_test("test-harness-scene", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_functions(mock_scene):
    fn = make_graph_test("test-harness-functions", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_agents(mock_scene):
    fn = make_graph_test("test-harness-agents", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_prompt(mock_scene):
    fn = make_graph_test("test-harness-prompt", False)

    async with MockClientContext() as client_reponses:
        client_reponses.append("The sum of 1 and 5 is 6.")
        client_reponses.append('```json\n{\n  "result": 6\n}\n```')
        await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_collectors(mock_scene):
    fn = make_graph_test("test-harness-collectors", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_context_ids(mock_scene):
    fn = make_graph_test("test-harness-context-ids", False)
    await fn(mock_scene)


@pytest.mark.asyncio
async def test_graph_assets(mock_scene_with_assets):
    fn = make_graph_test("test-harness-assets", False)
    await fn(mock_scene_with_assets)