"""Regression tests for WeComChannel._on_ws_text quote parsing.

A quoted non-text message (or any payload where ``quote``/``quote.text``/
``quote.text.content`` is JSON ``null``) must not crash the text handler.
``dict.get(key, default)`` returns the stored ``None`` when the key is present
with a null value, so chaining ``.get``/``.strip`` on it raised
``AttributeError`` before the fix.
"""

from __future__ import annotations

import asyncio
import sys
import types
from types import SimpleNamespace
from typing import Any
from unittest.mock import AsyncMock

import pytest

from app.channels.message_bus import InboundMessageType, MessageBus
from app.channels.wecom import WeComChannel


def _run(coro):
    """Run an async coroutine synchronously."""
    loop = asyncio.new_event_loop()
    try:
        return loop.run_until_complete(coro)
    finally:
        loop.close()


def _channel() -> WeComChannel:
    ch = WeComChannel(bus=MessageBus(), config={})
    # Bypass the real websocket publish path so the test exercises only the
    # frame-parsing logic in _on_ws_text.
    ch._publish_ws_inbound = AsyncMock()  # type: ignore[method-assign]
    return ch


class TestOnWsTextQuoteParsing:
    def test_quote_is_null_does_not_crash(self):
        ch = _channel()
        frame: dict[str, Any] = {"body": {"quote": None}}
        _run(ch._on_ws_text(frame))
        # Empty text and empty quote -> handler returns early, no publish.
        ch._publish_ws_inbound.assert_not_called()

    def test_quote_text_is_null_does_not_crash(self):
        ch = _channel()
        frame: dict[str, Any] = {"body": {"quote": {"text": None}}}
        _run(ch._on_ws_text(frame))
        ch._publish_ws_inbound.assert_not_called()

    def test_quote_content_is_null_does_not_crash(self):
        ch = _channel()
        frame: dict[str, Any] = {"body": {"quote": {"text": {"content": None}}}}
        _run(ch._on_ws_text(frame))
        ch._publish_ws_inbound.assert_not_called()

    def test_text_with_null_quote_still_publishes(self):
        # This is the crash the fix targets: a real text message that also
        # carries a null ``quote`` (e.g. quoting a non-text message) used to
        # raise AttributeError before reaching _publish_ws_inbound.
        ch = _channel()
        frame: dict[str, Any] = {"body": {"text": {"content": "hello"}, "quote": None}}
        _run(ch._on_ws_text(frame))
        ch._publish_ws_inbound.assert_called_once_with(frame, "hello")

    def test_text_and_valid_quote_are_combined(self):
        ch = _channel()
        frame: dict[str, Any] = {
            "body": {"text": {"content": "T"}, "quote": {"text": {"content": "Q"}}},
        }
        _run(ch._on_ws_text(frame))
        ch._publish_ws_inbound.assert_called_once_with(frame, "T\nQuote message: Q")


class TestGroupMentionBeforeCommand:
    """WeCom keeps the bot mention in group text, so "@bot /new" has to be
    classified as a command and reach the dispatcher without the mention.

    Feishu (#4229) and DingTalk (#4724) already strip a leading mention on the
    command path; ordinary chat must keep its mentions so the agent still sees
    who was addressed.
    """

    @staticmethod
    def _stub_aibot(monkeypatch: pytest.MonkeyPatch) -> None:
        """Make ``_publish_ws_inbound`` run without the optional WeCom SDK."""
        sdk = types.ModuleType("aibot")
        sdk.generate_req_id = lambda prefix="": f"{prefix}-test"
        monkeypatch.setitem(sys.modules, "aibot", sdk)

    @staticmethod
    def _live_channel() -> tuple[WeComChannel, MessageBus]:
        bus = MessageBus()
        channel = WeComChannel(bus=bus, config={})
        channel._ws_client = SimpleNamespace(
            reply=AsyncMock(),
            reply_stream=AsyncMock(),
            send_message=AsyncMock(),
        )
        return channel, bus

    @staticmethod
    def _group_frame(text: str) -> dict[str, Any]:
        return {
            "body": {
                "msgid": "msg-mention",
                "aibotid": "bot-1",
                "chatid": "wr-team",
                "chattype": "group",
                "from": {"userid": "alice"},
                "msgtype": "text",
                "text": {"content": text},
            }
        }

    @pytest.mark.parametrize(
        ("text", "expected"),
        [
            ("@RobotA /new", "/new"),
            ("@RobotA @_user_2 /status", "/status"),
        ],
    )
    def test_leading_mention_before_command_is_stripped(
        self,
        monkeypatch: pytest.MonkeyPatch,
        text: str,
        expected: str,
    ) -> None:
        self._stub_aibot(monkeypatch)
        channel, bus = self._live_channel()

        _run(channel._on_ws_text(self._group_frame(text)))

        inbound = bus.get_inbound_nowait()
        assert inbound.msg_type is InboundMessageType.COMMAND
        assert inbound.text == expected

    def test_plain_chat_keeps_its_mention(
        self,
        monkeypatch: pytest.MonkeyPatch,
    ) -> None:
        self._stub_aibot(monkeypatch)
        channel, bus = self._live_channel()

        _run(channel._on_ws_text(self._group_frame("@RobotA hello there")))

        inbound = bus.get_inbound_nowait()
        assert inbound.msg_type is InboundMessageType.CHAT
        assert inbound.text == "@RobotA hello there"

    def test_member_mention_before_a_command_also_classifies(
        self,
        monkeypatch: pytest.MonkeyPatch,
    ) -> None:
        """Accepted tradeoff: a member's mention looks the same as the bot's.

        WeCom text mentions are display names, so the frame's ``aibotid`` cannot
        be matched against them; ``@alice /status`` is therefore classified as
        the ``/status`` command, exactly as Feishu and DingTalk behave. Pinned
        here so a future change to mention matching shows up in review.
        """
        self._stub_aibot(monkeypatch)
        channel, bus = self._live_channel()

        _run(channel._on_ws_text(self._group_frame("@alice /status")))

        inbound = bus.get_inbound_nowait()
        assert inbound.msg_type is InboundMessageType.COMMAND
        assert inbound.text == "/status"