import asyncio

import pytest
from lambda_agent_api.server import MsgEventSendFile, MsgEventTextChunk
from pydantic import Field

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


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

    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, attachments: list[str] | None = None):
        self.calls.append(text)
        midpoint = len(text) // 2
        yield MsgEventTextChunk(text=text[:midpoint])
        yield MsgEventTextChunk(text=text[midpoint:])


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 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.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, attachments: list[str] | None = None):
        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 MsgEventTextChunk(text=text)


class AttachmentTrackingChatAgentApi:
    def __init__(self, chat_id: str) -> None:
        self.chat_id = chat_id
        self.calls: list[tuple[str, list[str] | None]] = []
        self.connect_calls = 0
        self.close_calls = 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, attachments: list[str] | None = None):
        self.calls.append((text, attachments))
        yield MsgEventTextChunk(text=text)


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

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


class FlakyChatAgentApi:
    def __init__(self, chat_id: str) -> None:
        self.chat_id = chat_id
        self.connect_calls = 0
        self.close_calls = 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, attachments: list[str] | None = None):
        raise ConnectionError("Connection closed")
        yield


class MessageResponseWithAttachments(MessageResponse):
    attachments: list[Attachment] = Field(default_factory=list)


def test_agent_api_wrapper_normalizes_base_url_and_uses_modern_constructor(monkeypatch):
    captured = {}

    def fake_init(self, agent_id, base_url=None, chat_id=0, **kwargs):
        captured["agent_id"] = agent_id
        captured["base_url"] = base_url
        captured["chat_id"] = chat_id

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

    wrapper = AgentApiWrapper(
        agent_id="agent-1",
        base_url="ws://platform-agent:8000/v1/agent_ws/",
        chat_id="41",
    )

    assert wrapper.chat_id == "41"
    assert wrapper._base_url == "ws://platform-agent:8000"
    assert captured == {
        "agent_id": "agent-1",
        "base_url": "ws://platform-agent:8000",
        "chat_id": "41",
    }


def test_agent_api_wrapper_for_chat_reuses_normalized_base_url(monkeypatch):
    init_calls = []

    def fake_init(self, agent_id, base_url=None, chat_id=0, **kwargs):
        self.id = agent_id
        self.chat_id = chat_id
        self.url = base_url
        init_calls.append((agent_id, base_url, chat_id))

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

    root = AgentApiWrapper(
        agent_id="agent-1",
        base_url="http://platform-agent:8000/v1/agent_ws/",
        chat_id="1",
    )

    child = root.for_chat("99")

    assert child is not root
    assert child.chat_id == "99"
    assert child._base_url == "http://platform-agent:8000"
    assert init_calls == [
        ("agent-1", "http://platform-agent:8000", "1"),
        ("agent-1", "http://platform-agent:8000", "99"),
    ]


@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=0,
        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") == 0


@pytest.mark.asyncio
async def test_real_platform_client_forwards_attachments_to_chat_api():
    agent_api = AttachmentTrackingAgentApiFactory()
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )
    attachment = Attachment(
        workspace_path="surfaces/matrix/alice/room/inbox/report.pdf",
        mime_type="application/pdf",
        filename="report.pdf",
        size=123,
    )

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

    assert agent_api.instances["chat-7"].calls == [
        ("hello", ["surfaces/matrix/alice/room/inbox/report.pdf"])
    ]
    assert result.response == "hello"
    assert result.tokens_used == 0


@pytest.mark.asyncio
async def test_real_platform_client_preserves_send_file_events_in_sync_result(monkeypatch):
    class FileEventAgentApi(AttachmentTrackingChatAgentApi):
        async def send_message(self, text: str, attachments: list[str] | None = None):
            self.calls.append((text, attachments))
            yield MsgEventTextChunk(text="he")
            yield MsgEventSendFile(path="report.pdf")
            yield MsgEventTextChunk(text="llo")

    agent_api = AttachmentTrackingAgentApiFactory(chat_api_cls=FileEventAgentApi)
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    monkeypatch.setattr(
        "sdk.real.MessageResponse",
        MessageResponseWithAttachments,
    )

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

    assert result.response == "hello"
    assert result.tokens_used == 0
    assert result.attachments == [
        Attachment(
            url="report.pdf",
            mime_type="application/octet-stream",
            filename="report.pdf",
            size=None,
            workspace_path="report.pdf",
        )
    ]


@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
    assert agent_api.instances["chat-1"].close_calls == 0


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

    with pytest.raises(PlatformError, match="Connection closed") as exc_info:
        await client.send_message("@alice:example.org", "chat-1", "hello")

    assert exc_info.value.code == "PLATFORM_CONNECTION_ERROR"
    assert "chat-1" not in client._chat_apis
    assert agent_api.instances["chat-1"].close_calls == 1


@pytest.mark.asyncio
async def test_real_platform_client_reconnects_after_closed_chat_api():
    agent_api = FakeAgentApiFactory()
    flaky = FlakyChatAgentApi("chat-1")
    healthy = AttachmentTrackingChatAgentApi("chat-1")
    provided = iter([flaky, healthy])

    def for_chat(chat_id: str):
        chat_api = next(provided)
        agent_api.created_chat_ids.append(chat_id)
        agent_api.instances[chat_id] = chat_api
        return chat_api

    agent_api.for_chat = for_chat
    client = RealPlatformClient(
        agent_api=agent_api,
        prototype_state=PrototypeStateStore(),
        platform="matrix",
    )

    with pytest.raises(PlatformError, match="Connection closed"):
        await client.send_message("@alice:example.org", "chat-1", "hello")

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

    assert result.response == "again"
    assert agent_api.created_chat_ids == ["chat-1", "chat-1"]
    assert healthy.calls == [("again", None)]


@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=0,
        ),
    ]
    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