import pytest

from gateway.config import GatewayConfig, Platform, PlatformConfig
from gateway.platforms.base import MessageEvent, MessageType
from gateway.run import GatewayRunner
from gateway.session import SessionSource


def _make_runner() -> GatewayRunner:
    runner = object.__new__(GatewayRunner)
    runner.config = GatewayConfig(
        platforms={Platform.TELEGRAM: PlatformConfig(enabled=True, token="fake")}
    )
    runner.adapters = {}
    runner._pending_native_image_paths_by_session = {}
    runner._session_model_overrides = {}
    runner._session_reasoning_overrides = {}
    return runner


def _source() -> SessionSource:
    return SessionSource(
        platform=Platform.TELEGRAM,
        chat_id="273403055",
        chat_type="dm",
        user_id="42",
        user_name="Maxim",
    )


def _image_event(text: str = "look") -> MessageEvent:
    return MessageEvent(
        text=text,
        message_type=MessageType.PHOTO,
        source=_source(),
        media_urls=["/tmp/cashback.png"],
        media_types=["image/png"],
    )


def _auto_config() -> dict:
    return {
        "agent": {"image_input_mode": "auto"},
        "auxiliary": {"vision": {"provider": "auto", "model": "", "base_url": ""}},
        "model": {"provider": "xiaomi", "default": "mimo-v2.5-pro"},
    }


@pytest.mark.asyncio
async def test_prepare_image_routing_uses_session_vision_model_override(monkeypatch):
    """Telegram /model overrides must affect native-vs-text image routing.

    Regression: _prepare_inbound_message_text used config.yaml's default model
    before the per-session model override was installed on auxiliary_client's
    runtime globals. A Telegram session switched to a vision model still had
    screenshots pre-analyzed as text when config.default was text-only.
    """
    runner = _make_runner()
    source = _source()
    event = _image_event()
    cfg = _auto_config()

    monkeypatch.setattr("gateway.run._load_gateway_config", lambda: cfg)
    monkeypatch.setattr("hermes_cli.config.load_config", lambda: cfg)
    monkeypatch.setattr("agent.auxiliary_client._read_main_provider", lambda: "xiaomi")
    monkeypatch.setattr("agent.auxiliary_client._read_main_model", lambda: "mimo-v2.5-pro")
    monkeypatch.setattr(
        runner,
        "_resolve_session_agent_runtime",
        lambda **_: ("gpt-5.5", {"provider": "openai-codex"}),
    )

    def fake_supports(provider, model, config):
        return provider == "openai-codex" and model == "gpt-5.5"

    monkeypatch.setattr("agent.image_routing._lookup_supports_vision", fake_supports)

    async def fail_enrich(*_args, **_kwargs):
        pytest.fail("vision-capable session override should use native image routing")

    monkeypatch.setattr(runner, "_enrich_message_with_vision", fail_enrich)

    result = await runner._prepare_inbound_message_text(
        event=event,
        source=source,
        history=[],
    )

    session_key = runner._session_key_for_source(source)
    assert result == "look"
    assert runner._pending_native_image_paths_by_session[session_key] == [
        "/tmp/cashback.png"
    ]


@pytest.mark.asyncio
async def test_prepare_image_routing_falls_back_to_text_for_text_only_session_override(monkeypatch):
    """A text-only session override should get vision_analyze text fallback.

    Regression mirror case: if config.default is a vision model but the current
    Telegram session is switched to a text-only provider (for example Mimo),
    auto routing must not attach pixels natively to the text-only model.
    """
    runner = _make_runner()
    source = _source()
    event = _image_event()
    cfg = _auto_config()
    cfg["model"] = {"provider": "openai-codex", "default": "gpt-5.5"}

    monkeypatch.setattr("gateway.run._load_gateway_config", lambda: cfg)
    monkeypatch.setattr("hermes_cli.config.load_config", lambda: cfg)
    monkeypatch.setattr("agent.auxiliary_client._read_main_provider", lambda: "openai-codex")
    monkeypatch.setattr("agent.auxiliary_client._read_main_model", lambda: "gpt-5.5")
    monkeypatch.setattr(
        runner,
        "_resolve_session_agent_runtime",
        lambda **_: ("mimo-v2.5-pro", {"provider": "xiaomi"}),
    )

    def fake_supports(provider, model, config):
        return provider == "openai-codex" and model == "gpt-5.5"

    monkeypatch.setattr("agent.image_routing._lookup_supports_vision", fake_supports)

    async def fake_enrich(user_text, image_paths):
        assert user_text == "look"
        assert image_paths == ["/tmp/cashback.png"]
        return "[vision summary]\n\nlook"

    monkeypatch.setattr(runner, "_enrich_message_with_vision", fake_enrich)

    result = await runner._prepare_inbound_message_text(
        event=event,
        source=source,
        history=[],
    )

    session_key = runner._session_key_for_source(source)
    assert result == "[vision summary]\n\nlook"
    assert runner._pending_native_image_paths_by_session.get(session_key) is None