"""Regression tests for tool-using response silent drop (issue #29346).

When the agent returns a non-empty response that the extract pipeline
(extract_media / extract_images / extract_local_files / inline directive
strips) happens to reduce to an empty string, the ``if text_content:`` guard
in ``BasePlatformAdapter._process_message_background`` previously bypassed
the send entirely. The symptom was a ``response ready`` log followed by
silence — no ``Sending response`` line, no error — and the final answer
never reaching the channel.

The fix (A2/A3 of the silent-response-loss plan) preserves the pre-extract
response and, when no native attachment was produced to deliver in its
place, sanitizes the original text and sends it as a fallback on ALL
platforms (a ``response_delivery_recovered`` WARNING marks the recovery so
the silent-drop pattern is observable).  When even the sanitized recovery
yields nothing deliverable, a ``response_delivery_dropped`` ERROR fires so a
genuinely-lost response is never silent.

Salvaged and de-scoped from the superseded Discord-only PR #33842.
"""

import asyncio
import logging

import pytest

from gateway.config import Platform, PlatformConfig
from gateway.platforms.base import (
    BasePlatformAdapter,
    MessageEvent,
    SendResult,
)
from gateway.session import SessionSource, build_session_key


class _DummyAdapter(BasePlatformAdapter):
    """Minimal BasePlatformAdapter for dispatch tests on any platform."""

    def __init__(self, platform: Platform):
        super().__init__(PlatformConfig(enabled=True, token="fake-token"), platform)
        self.sent: list[dict] = []

    async def connect(self) -> bool:
        return True

    async def disconnect(self) -> None:
        return None

    async def send(self, chat_id, content, reply_to=None, metadata=None) -> SendResult:
        self.sent.append({"chat_id": chat_id, "content": content})
        return SendResult(success=True, message_id="msg-1")

    async def send_typing(self, chat_id: str, metadata=None) -> None:
        return None

    async def get_chat_info(self, chat_id: str):
        return {"id": chat_id}


def _make_event(platform: Platform, chat_id: str = "111", message_id: str = "m1") -> MessageEvent:
    return MessageEvent(
        text="hello",
        source=SessionSource(platform=platform, chat_id=chat_id, chat_type="dm"),
        message_id=message_id,
    )


async def _hold_typing(_chat_id, interval=2.0, metadata=None, stop_event=None):
    if stop_event is not None:
        await stop_event.wait()
    else:
        await asyncio.Event().wait()


def _strip_everything(adapter, monkeypatch):
    """Force the extract pipeline to reduce text_content to "" with no
    attachments — the exact failure mode that made the drop invisible."""
    monkeypatch.setattr(
        type(adapter), "extract_media", staticmethod(lambda content: ([], content))
    )
    monkeypatch.setattr(
        type(adapter), "extract_images", staticmethod(lambda content: ([], ""))
    )
    monkeypatch.setattr(
        type(adapter), "extract_local_files", staticmethod(lambda content: ([], ""))
    )


@pytest.mark.parametrize("platform", [Platform.DISCORD, Platform.TELEGRAM])
class TestExtractStripRecoveryAllPlatforms:
    """A non-empty response stripped to empty must be recovered on EVERY
    platform (the fix de-scopes the recovery from Discord-only)."""

    @pytest.mark.asyncio
    async def test_response_reduced_to_empty_is_recovered_and_sent(
        self, platform, monkeypatch, caplog
    ):
        adapter = _DummyAdapter(platform)
        adapter._keep_typing = _hold_typing

        tool_response = (
            "Based on my search, the cheapest TPE-PAR flight on Dec 14 is $632 "
            "via Saudia. Here are the top options sorted by price... "
        ) * 5
        assert len(tool_response) > 500

        async def handler(_event):
            return tool_response

        adapter.set_message_handler(handler)
        _strip_everything(adapter, monkeypatch)

        event = _make_event(platform)
        with caplog.at_level(logging.WARNING, logger="gateway.platforms.base"):
            await adapter._process_message_background(
                event, build_session_key(event.source)
            )

        # The response WAS delivered, not silently dropped.
        assert len(adapter.sent) == 1, f"expected 1 send, got {adapter.sent}"
        assert adapter.sent[0]["content"] == tool_response.strip()
        # And the recovery is observable via the stable event key.
        assert any(
            "response_delivery_recovered" in r.getMessage()
            for r in caplog.records
        ), [r.getMessage() for r in caplog.records]

    @pytest.mark.asyncio
    async def test_directives_stripped_from_fallback_text(self, platform, monkeypatch):
        adapter = _DummyAdapter(platform)
        adapter._keep_typing = _hold_typing

        raw = (
            "[[audio_as_voice]]\n[[as_document]]\nMEDIA: /tmp/nope.ogg\n"
            "The real answer the user should see."
        )

        async def handler(_event):
            return raw

        adapter.set_message_handler(handler)
        _strip_everything(adapter, monkeypatch)

        event = _make_event(platform)
        await adapter._process_message_background(event, build_session_key(event.source))

        assert len(adapter.sent) == 1
        delivered = adapter.sent[0]["content"]
        assert "[[audio_as_voice]]" not in delivered
        assert "[[as_document]]" not in delivered
        assert "MEDIA:" not in delivered
        assert "The real answer the user should see." in delivered

    @pytest.mark.asyncio
    async def test_no_fallback_when_attachment_produced(self, platform, monkeypatch):
        """When an image attachment IS extracted, the empty text_content is
        intentional — recovery must NOT re-send the original markdown and
        duplicate the attachment's content."""
        adapter = _DummyAdapter(platform)
        adapter._keep_typing = _hold_typing

        async def handler(_event):
            return "![chart](https://example.com/chart.png)"

        adapter.set_message_handler(handler)
        monkeypatch.setattr(
            type(adapter), "extract_media", staticmethod(lambda content: ([], content))
        )
        monkeypatch.setattr(
            type(adapter), "extract_images",
            staticmethod(lambda content: ([("https://example.com/chart.png", "chart")], "")),
        )
        monkeypatch.setattr(
            type(adapter), "extract_local_files", staticmethod(lambda content: ([], ""))
        )
        adapter.send_multiple_images = lambda *a, **kw: asyncio.sleep(0, result=None)

        event = _make_event(platform)
        await adapter._process_message_background(event, build_session_key(event.source))

        assert adapter.sent == [], f"expected no text echo, got {adapter.sent}"


class TestRecoveryDoesNotLeakMediaFragments:
    """The A2 recovery must not leak fragments of a MEDIA: path to the user.

    extract_media's real regex matches paths WITH SPACES; if the recovery
    sanitizes the raw pre-extract snapshot with a weaker MEDIA regex (one that
    stops at the first space), a spaced path whose file gets filtered out leaks
    a fragment like 'vacation photo.png'.  The recovery must instead use the
    post-extract_media `response`, which the strong regex already cleaned.
    """

    @pytest.mark.asyncio
    async def test_spaced_media_path_does_not_leak_fragment(self, monkeypatch, caplog):
        adapter = _DummyAdapter(Platform.DISCORD)
        adapter._keep_typing = _hold_typing

        async def handler(_event):
            # Spaced path with a valid extension — matched in full by the real
            # extract_media regex, then removed from the body.
            return "MEDIA: /tmp/nope_dir_zzz/my vacation photo.png"

        adapter.set_message_handler(handler)
        # Use the REAL extract_media (so the strong regex cleans `response`),
        # but force the path to be filtered out (unsafe/nonexistent) so we hit
        # the empty-text + no-attachment recovery branch deterministically.
        monkeypatch.setattr(
            type(adapter), "filter_media_delivery_paths", staticmethod(lambda m: [])
        )

        event = _make_event(Platform.DISCORD)
        with caplog.at_level(logging.ERROR, logger="gateway.platforms.base"):
            await adapter._process_message_background(
                event, build_session_key(event.source)
            )

        # No fragment of the media path may reach the user.
        leaked = [
            s for s in adapter.sent
            if "vacation" in s["content"] or "photo" in s["content"] or "MEDIA" in s["content"]
        ]
        assert leaked == [], f"media-path fragment leaked to user: {leaked}"
        # The genuinely-undeliverable response is logged loudly, not silent.
        assert any(
            "response_delivery_dropped" in r.getMessage()
            for r in caplog.records if r.levelno == logging.ERROR
        ), [r.getMessage() for r in caplog.records]


class TestUnrecoverableDropIsLoud:
    """A non-empty response that produces NOTHING deliverable (sanitizes to
    empty, no attachment) must log a response_delivery_dropped ERROR rather
    than vanishing silently."""

    @pytest.mark.asyncio
    async def test_directive_only_response_logs_dropped(self, monkeypatch, caplog):
        adapter = _DummyAdapter(Platform.DISCORD)
        adapter._keep_typing = _hold_typing

        async def handler(_event):
            return "[[audio_as_voice]]\nMEDIA: /tmp/missing.ogg"  # only directives

        adapter.set_message_handler(handler)
        # Extraction strips to empty AND the media path filtered out (no file).
        _strip_everything(adapter, monkeypatch)

        event = _make_event(Platform.DISCORD)
        with caplog.at_level(logging.ERROR, logger="gateway.platforms.base"):
            await adapter._process_message_background(
                event, build_session_key(event.source)
            )

        assert adapter.sent == []
        assert any(
            "response_delivery_dropped" in r.getMessage()
            for r in caplog.records if r.levelno == logging.ERROR
        ), [r.getMessage() for r in caplog.records]