import asyncio

import pytest

from core.protocol import SettingsAction
import sdk.agent_api_wrapper as agent_api_wrapper_module
from sdk.agent_api_wrapper import AgentApiWrapper
from sdk.interface import MessageChunk, MessageResponse, UserSettings
from sdk.prototype_state import PrototypeStateStore
from sdk.real import RealPlatformClient


class FakeChunk:
    def __init__(self, text: str) -> None:
        self.text = text


class FakeChatAgentApi:
    def __init__(self, chat_id: str) -> None:
        self.chat_id = chat_id
        self.calls: list[str] = []
        self.connect_calls = 0
        self.close_calls = 0
        self.last_tokens_used = 0

    async def connect(self) -> None:
        self.connect_calls += 1

    async def close(self) -> None:
        self.close_calls += 1

    async def send_message(self, text: str):
        self.calls.append(text)
        midpoint = len(text) // 2
        yield FakeChunk(text[:midpoint])
        yield FakeChunk(text[midpoint:])
        self.last_tokens_used = 3


class FakeAgentApiFactory:
    def __init__(self) -> None:
        self.created_chat_ids: list[str] = []
        self.instances: dict[str, FakeChatAgentApi] = {}

    def for_chat(self, chat_id: str) -> FakeChatAgentApi:
        chat_api = FakeChatAgentApi(chat_id)
        self.created_chat_ids.append(chat_id)
        self.instances[chat_id] = chat_api
        return chat_api


class LegacyAgentApi:
    def __init__(self) -> None:
        self.calls: list[str] = []
        self.last_tokens_used = 0

    async def send_message(self, text: str):
        self.calls.append(text)
        yield FakeChunk(text[:2])
        yield FakeChunk(text[2:])
        self.last_tokens_used = 7


class BlockingChatAgentApi:
    def __init__(self, chat_id: str) -> None:
        self.chat_id = chat_id
        self.calls: list[str] = []
        self.connect_calls = 0
        self.close_calls = 0
        self.last_tokens_used = 0
        self.active_calls = 0
        self.max_active_calls = 0
        self.started = asyncio.Event()
        self.release = asyncio.Event()

    async def connect(self) -> None:
        self.connect_calls += 1

    async def close(self) -> None:
        self.close_calls += 1

    async def send_message(self, text: str):
        self.calls.append(text)
        self.active_calls += 1
        self.max_active_calls = max(self.max_active_calls, self.active_calls)
        self.started.set()
        await self.release.wait()
        self.active_calls -= 1
        yield FakeChunk(text)
        self.last_tokens_used = len(text)


def test_agent_api_wrapper_uses_modern_constructor_when_available(monkeypatch):
    calls: list[dict[str, object]] = []

    def fake_init(self, agent_id, base_url, chat_id, **kwargs):
        calls.append(
            {
                "agent_id": agent_id,
                "base_url": base_url,
                "chat_id": chat_id,
                "kwargs": kwargs,
            }
        )
        self.id = agent_id
        self.url = base_url
        self.callback = kwargs.get("callback")
        self.on_disconnect = kwargs.get("on_disconnect")

    monkeypatch.setattr(agent_api_wrapper_module.AgentApi, "__init__", fake_init)

    wrapper = AgentApiWrapper(
        agent_id="agent-1",
        base_url="https://agent.example.com/v1/agent_ws",
        chat_id="chat-1",
        callback="cb",
        on_disconnect="disconnect",
    )
    child = wrapper.for_chat("chat-2")

    assert calls == [
        {
            "agent_id": "agent-1",
            "base_url": "https://agent.example.com",
            "chat_id": "chat-1",
            "kwargs": {"callback": "cb", "on_disconnect": "disconnect"},
        },
        {
            "agent_id": "agent-1",
            "base_url": "https://agent.example.com",
            "chat_id": "chat-2",
            "kwargs": {"callback": "cb", "on_disconnect": "disconnect"},
        },
    ]
    assert wrapper._base_url == "https://agent.example.com"
    assert wrapper.chat_id == "chat-1"
    assert wrapper.last_tokens_used == 0
    assert child.chat_id == "chat-2"


def test_agent_api_wrapper_falls_back_to_legacy_url_constructor(monkeypatch):
    calls: list[dict[str, object]] = []

    def fake_init(self, agent_id, url, callback=None, on_disconnect=None):
        calls.append(
            {
                "agent_id": agent_id,
                "url": url,
                "callback": callback,
                "on_disconnect": on_disconnect,
            }
        )
        self.id = agent_id
        self.url = url
        self.callback = callback
        self.on_disconnect = on_disconnect

    monkeypatch.setattr(agent_api_wrapper_module.AgentApi, "__init__", fake_init)

    wrapper = AgentApiWrapper(
        agent_id="agent-2",
        url="https://agent.example.com/v1/agent_ws/chat-9/",
        chat_id="chat-9",
        callback="cb",
    )

    assert calls == [
        {
            "agent_id": "agent-2",
            "url": "https://agent.example.com/v1/agent_ws/chat-9/",
            "callback": "cb",
            "on_disconnect": None,
        }
    ]
    assert wrapper._base_url == "https://agent.example.com"
    assert wrapper.chat_id == "chat-9"
    assert wrapper.last_tokens_used == 0


@pytest.mark.asyncio
async def test_real_platform_client_get_or_create_user_uses_local_state():
    client = RealPlatformClient(
        agent_api=FakeAgentApiFactory(),
        prototype_state=PrototypeStateStore(),
    )

    first = await client.get_or_create_user("u1", "matrix", "Alice")
    second = await client.get_or_create_user("u1", "matrix")

    assert first.user_id == "usr-matrix-u1"
    assert first.is_new is True
    assert second.user_id == first.user_id
    assert second.is_new is False
    assert second.display_name == "Alice"


@pytest.mark.asyncio
async def test_real_platform_client_send_message_uses_chat_bound_client():
    agent_api = FakeAgentApiFactory()
    prototype_state = PrototypeStateStore()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=prototype_state,
        platform="matrix",
    )

    result = await client.send_message("@alice:example.org", "chat-7", "hello")

    assert result == MessageResponse(
        message_id="@alice:example.org",
        response="hello",
        tokens_used=3,
        finished=True,
    )
    assert agent_api.created_chat_ids == ["chat-7"]
    assert agent_api.instances["chat-7"].chat_id == "chat-7"
    assert agent_api.instances["chat-7"].calls == ["hello"]
    assert agent_api.instances["chat-7"].connect_calls == 1
    assert await prototype_state.get_last_tokens_used_for_context("chat-7") == 3


@pytest.mark.asyncio
async def test_real_platform_client_works_with_legacy_agent_api_without_for_chat():
    legacy_api = LegacyAgentApi()
    client = RealPlatformClient(
        agent_api=legacy_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    result = await client.send_message("@alice:example.org", "chat-legacy", "hello")

    assert result == MessageResponse(
        message_id="@alice:example.org",
        response="hello",
        tokens_used=7,
        finished=True,
    )
    assert legacy_api.calls == ["hello"]


@pytest.mark.asyncio
async def test_real_platform_client_reuses_cached_chat_client():
    agent_api = FakeAgentApiFactory()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    await client.send_message("@alice:example.org", "chat-1", "hello")
    await client.send_message("@alice:example.org", "chat-1", "again")

    assert agent_api.created_chat_ids == ["chat-1"]
    assert agent_api.instances["chat-1"].calls == ["hello", "again"]
    assert agent_api.instances["chat-1"].connect_calls == 1


@pytest.mark.asyncio
async def test_real_platform_client_creates_chat_client_atomically_for_concurrent_requests():
    agent_api = FakeAgentApiFactory()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    results = await asyncio.gather(
        client.send_message("@alice:example.org", "chat-1", "hello"),
        client.send_message("@alice:example.org", "chat-1", "again"),
    )

    assert [result.response for result in results] == ["hello", "again"]
    assert agent_api.created_chat_ids == ["chat-1"]
    assert agent_api.instances["chat-1"].connect_calls == 1
    assert agent_api.instances["chat-1"].calls == ["hello", "again"]


@pytest.mark.asyncio
async def test_real_platform_client_creates_distinct_clients_per_chat():
    agent_api = FakeAgentApiFactory()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    await client.send_message("@alice:example.org", "chat-1", "hello")
    await client.send_message("@alice:example.org", "chat-2", "world")

    assert agent_api.created_chat_ids == ["chat-1", "chat-2"]
    assert agent_api.instances["chat-1"] is not agent_api.instances["chat-2"]
    assert agent_api.instances["chat-1"].calls == ["hello"]
    assert agent_api.instances["chat-2"].calls == ["world"]


@pytest.mark.asyncio
async def test_real_platform_client_serializes_same_chat_streams_across_send_paths():
    agent_api = FakeAgentApiFactory()
    agent_api.instances["chat-1"] = BlockingChatAgentApi("chat-1")
    agent_api.for_chat = lambda chat_id: agent_api.instances.setdefault(chat_id, BlockingChatAgentApi(chat_id))
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    async def consume_stream():
        chunks = []
        async for chunk in client.stream_message("@alice:example.org", "chat-1", "hello"):
            chunks.append(chunk)
        return chunks

    stream_task = asyncio.create_task(consume_stream())
    await asyncio.wait_for(agent_api.instances["chat-1"].started.wait(), timeout=1)

    send_task = asyncio.create_task(client.send_message("@alice:example.org", "chat-1", "again"))
    await asyncio.sleep(0)

    assert agent_api.instances["chat-1"].calls == ["hello"]
    assert agent_api.instances["chat-1"].max_active_calls == 1

    agent_api.instances["chat-1"].release.set()
    stream_chunks = await stream_task
    send_result = await send_task

    assert [chunk.delta for chunk in stream_chunks] == ["hello", ""]
    assert send_result.response == "again"
    assert agent_api.instances["chat-1"].calls == ["hello", "again"]
    assert agent_api.instances["chat-1"].max_active_calls == 1


@pytest.mark.asyncio
async def test_real_platform_client_stream_message_emits_final_tokens_chunk():
    agent_api = FakeAgentApiFactory()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    chunks = []
    async for chunk in client.stream_message("@alice:example.org", "chat-1", "hello"):
        chunks.append(chunk)

    assert chunks == [
        MessageChunk(
            message_id="@alice:example.org",
            delta="he",
            finished=False,
            tokens_used=0,
        ),
        MessageChunk(
            message_id="@alice:example.org",
            delta="llo",
            finished=False,
            tokens_used=0,
        ),
        MessageChunk(
            message_id="@alice:example.org",
            delta="",
            finished=True,
            tokens_used=3,
        ),
    ]
    assert agent_api.created_chat_ids == ["chat-1"]
    assert agent_api.instances["chat-1"].calls == ["hello"]


@pytest.mark.asyncio
async def test_real_platform_client_settings_are_local():
    client = RealPlatformClient(
        agent_api=FakeAgentApiFactory(),
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    await client.update_settings(
        "usr-matrix-u1",
        SettingsAction(action="toggle_skill", payload={"skill": "browser", "enabled": True}),
    )

    settings = await client.get_settings("usr-matrix-u1")

    assert isinstance(settings, UserSettings)
    assert settings.skills["browser"] is True
    assert settings.skills["web-search"] is True