from __future__ import annotations

import json

import pytest

from agent import image_gen_registry


@pytest.fixture(autouse=True)
def _reset_registry():
    image_gen_registry._reset_for_tests()
    yield
    image_gen_registry._reset_for_tests()


class TestPluginDispatch:


    def test_handler_forwards_only_the_creative_controls_the_plugin_declares(self, monkeypatch, tmp_path):
        """Declared controls reach generate(); an undeclared one the model sent anyway is dropped, so a
        plugin whose generate() lacks **kwargs never sees it."""
        from agent.image_gen_provider import ImageGenProvider
        from hermes_cli import plugins as plugins_module
        from tools import image_generation_tool

        seen = {}

        class _Recorder(ImageGenProvider):
            @property
            def name(self):
                return "recorder"

            def capabilities(self):
                return {"modalities": ["text"], "creative_controls": ["intensity"]}

            def generate(self, prompt, aspect_ratio="landscape", **kwargs):
                seen.update(kwargs)
                return {"success": True, "image": "/tmp/recorder.png", "model": "m", "prompt": prompt,
                        "aspect_ratio": aspect_ratio, "provider": "recorder"}

            def list_models(self):
                return []

        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
        image_gen_registry.register_provider(_Recorder())
        monkeypatch.setattr(image_generation_tool, "_read_configured_image_provider", lambda: "recorder")
        monkeypatch.setattr(plugins_module, "_ensure_plugins_discovered", lambda **kwargs: None)

        result = json.loads(image_generation_tool._handle_image_generate(
            {"prompt": "draw cat", "aspect_ratio": "square", "intensity": 80, "creativity": "raw"}))

        assert result["success"] is True
        assert seen["intensity"] == 80
        assert "creativity" not in seen

    @pytest.mark.parametrize("eligible, image_url, enabled, fal_ok, falls_back", [
        (True, None, True, True, True),
        (False, None, True, True, False),
        (True, "https://x/ref.png", True, True, False),
        (True, None, False, True, False),
        (True, None, True, False, True),
    ])
    def test_managed_krea_failure_falls_back_to_fal_only_when_safe(
            self, monkeypatch, tmp_path, eligible, image_url, enabled, fal_ok, falls_back):
        """Fallback runs for an eligible Krea failure with no source images and the switch on, and
        names what ran; otherwise the Krea error is returned untouched."""
        from tools import image_generation_tool as ig

        krea_error = {"success": False, "image": None, "error": "Krea connection error", "error_type": "connection_error",
                      "fallback_eligible": eligible}
        fal_calls = []

        def fake_fal(prompt, aspect_ratio, **kwargs):
            fal_calls.append(kwargs)
            if fal_ok:
                return json.dumps({"success": True, "image": "/tmp/fal.png", "modality": "text", "upscaled": False})
            return json.dumps({"success": False, "image": None, "error": "FAL down", "error_type": "api_error"})

        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
        monkeypatch.setattr(ig, "_dispatch_to_plugin_provider", lambda *a, **k: None)
        monkeypatch.setattr(ig, "_maybe_route_managed_model", lambda *a, **k: json.dumps(krea_error))
        monkeypatch.setattr(ig, "image_generate_tool", fake_fal)
        monkeypatch.setattr("plugins.image_gen.krea.fallback_to_fal_enabled", lambda: enabled)

        args = {"prompt": "draw cat", "aspect_ratio": "square"}
        if image_url:
            args["image_url"] = image_url
        result = json.loads(ig._handle_image_generate(args))

        if not falls_back:
            assert fal_calls == []
            assert result["error"] == "Krea connection error"
            assert "fallback_from" not in result
            return
        assert len(fal_calls) == 1 and fal_calls[0]["fal_model"] == ig.DEFAULT_MODEL
        assert result["fallback_from"] == "krea"
        assert result["fallback_reason"] == "Krea connection error"
        assert result["success"] is fal_ok
        assert ("generated on FAL" if fal_ok else "also failed") in result["note"]

    def test_fallback_keeps_the_upscale_and_names_the_fal_upscaler(self, monkeypatch, tmp_path):
        """An upscale asked of Krea still runs on the FAL rerun, and the note says which upscaler did it."""
        from tools import image_generation_tool as ig

        krea_error = {"success": False, "image": None, "error": "refused", "error_type": "connection_error",
                      "fallback_eligible": True}
        fal_calls = []

        def fake_fal(prompt, aspect_ratio, **kwargs):
            fal_calls.append(kwargs)
            return json.dumps({"success": True, "image": "/tmp/fal.png", "modality": "text", "upscaled": True})

        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
        monkeypatch.setattr(ig, "_dispatch_to_plugin_provider", lambda *a, **k: None)
        monkeypatch.setattr(ig, "_maybe_route_managed_model", lambda *a, **k: json.dumps(krea_error))
        monkeypatch.setattr(ig, "image_generate_tool", fake_fal)
        monkeypatch.setattr("plugins.image_gen.krea.fallback_to_fal_enabled", lambda: True)

        result = json.loads(ig._handle_image_generate({"prompt": "draw cat", "aspect_ratio": "square", "upscale": True}))

        assert fal_calls[0]["upscale"] is True
        assert ig.UPSCALER_MODEL in result["note"] and "Krea Enhance" in result["note"]

    def test_deepinfra_key_alone_does_not_select_image_backend(self, monkeypatch):
        """DeepInfra chat credentials do not imply consent to image billing."""
        from tools import image_generation_tool

        monkeypatch.setenv("DEEPINFRA_API_KEY", "«redacted:sk-…»")
        monkeypatch.delenv("FAL_KEY", raising=False)
        monkeypatch.setattr(image_generation_tool, "_read_configured_image_provider", lambda: None)
        assert image_generation_tool._dispatch_to_plugin_provider("a cat", "square") is None

    def test_requirements_ignore_unselected_paid_plugin(self, monkeypatch):
        from tools import image_generation_tool

        monkeypatch.setattr(image_generation_tool, "check_fal_api_key", lambda: False)
        monkeypatch.setattr(
            image_generation_tool, "_read_configured_image_provider", lambda: None
        )
        assert image_generation_tool.check_image_generation_requirements() is False