hermes-agent/tests/tools/test_image_generation.py

"""Tests for tools/image_generation_tool.py — FAL multi-model support.

Covers the pure logic of the new wrapper: catalog integrity, the three size
families (image_size_preset / aspect_ratio / gpt_literal), the supports
whitelist, default merging, GPT quality override, and model resolution
fallback. Does NOT exercise fal_client submission — that's covered by
tests/tools/test_managed_media_gateways.py.
"""

from __future__ import annotations

from unittest.mock import patch

import pytest


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------

@pytest.fixture
def image_tool():
    """Fresh import of tools.image_generation_tool per test."""
    import importlib
    import tools.image_generation_tool as mod
    return importlib.reload(mod)


# ---------------------------------------------------------------------------
# Catalog integrity
# ---------------------------------------------------------------------------

class TestFalCatalog:
    """Every FAL_MODELS entry must have a consistent shape."""

    def test_default_model_is_klein(self, image_tool):
        assert image_tool.DEFAULT_MODEL == "fal-ai/flux-2/klein/9b"

    def test_default_model_in_catalog(self, image_tool):
        assert image_tool.DEFAULT_MODEL in image_tool.FAL_MODELS

    def test_all_entries_have_required_keys(self, image_tool):
        required = {
            "display", "speed", "strengths", "price",
            "size_style", "sizes", "defaults", "supports", "upscale",
        }
        for mid, meta in image_tool.FAL_MODELS.items():
            missing = required - set(meta.keys())
            assert not missing, f"{mid} missing required keys: {missing}"

    def test_size_style_is_valid(self, image_tool):
        valid = {"image_size_preset", "aspect_ratio", "gpt_literal"}
        for mid, meta in image_tool.FAL_MODELS.items():
            assert meta["size_style"] in valid, \
                f"{mid} has invalid size_style: {meta['size_style']}"

    def test_sizes_cover_all_aspect_ratios(self, image_tool):
        for mid, meta in image_tool.FAL_MODELS.items():
            assert set(meta["sizes"].keys()) >= {"landscape", "square", "portrait"}, \
                f"{mid} missing a required aspect_ratio key"

    def test_supports_is_a_set(self, image_tool):
        for mid, meta in image_tool.FAL_MODELS.items():
            assert isinstance(meta["supports"], set), \
                f"{mid}.supports must be a set, got {type(meta['supports'])}"

    def test_prompt_is_always_supported(self, image_tool):
        for mid, meta in image_tool.FAL_MODELS.items():
            assert "prompt" in meta["supports"], \
                f"{mid} must support 'prompt'"

    def test_only_flux2_pro_upscales_by_default(self, image_tool):
        """Upscaling should default to False for all new models to preserve
        the <1s / fast-render value prop. Only flux-2-pro stays True for
        backward-compat with the previous default."""
        for mid, meta in image_tool.FAL_MODELS.items():
            if mid == "fal-ai/flux-2-pro":
                assert meta["upscale"] is True, \
                    "flux-2-pro should keep upscale=True for backward-compat"
            else:
                assert meta["upscale"] is False, \
                    f"{mid} should default to upscale=False"


# ---------------------------------------------------------------------------
# Payload building — three size families
# ---------------------------------------------------------------------------

class TestImageSizePresetFamily:
    """Flux, z-image, qwen, recraft, ideogram all use preset enum sizes."""

    def test_klein_landscape_uses_preset(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hello", "landscape")
        assert p["image_size"] == "landscape_16_9"
        assert "aspect_ratio" not in p

    def test_klein_square_uses_preset(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hello", "square")
        assert p["image_size"] == "square_hd"

    def test_klein_portrait_uses_preset(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hello", "portrait")
        assert p["image_size"] == "portrait_16_9"


class TestAspectRatioFamily:
    """Nano-banana uses aspect_ratio enum, NOT image_size."""

    def test_nano_banana_landscape_uses_aspect_ratio(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/nano-banana", "hello", "landscape")
        assert p["aspect_ratio"] == "16:9"
        assert "image_size" not in p

    def test_nano_banana_square_uses_aspect_ratio(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/nano-banana", "hello", "square")
        assert p["aspect_ratio"] == "1:1"

    def test_nano_banana_portrait_uses_aspect_ratio(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/nano-banana", "hello", "portrait")
        assert p["aspect_ratio"] == "9:16"


class TestGptLiteralFamily:
    """GPT-Image 1.5 uses literal size strings."""

    def test_gpt_landscape_is_literal(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hello", "landscape")
        assert p["image_size"] == "1536x1024"

    def test_gpt_square_is_literal(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hello", "square")
        assert p["image_size"] == "1024x1024"

    def test_gpt_portrait_is_literal(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hello", "portrait")
        assert p["image_size"] == "1024x1536"


# ---------------------------------------------------------------------------
# Supports whitelist — the main safety property
# ---------------------------------------------------------------------------

class TestSupportsFilter:
    """No model should receive keys outside its `supports` set."""

    def test_payload_keys_are_subset_of_supports_for_all_models(self, image_tool):
        for mid, meta in image_tool.FAL_MODELS.items():
            payload = image_tool._build_fal_payload(mid, "test", "landscape", seed=42)
            unsupported = set(payload.keys()) - meta["supports"]
            assert not unsupported, \
                f"{mid} payload has unsupported keys: {unsupported}"

    def test_gpt_image_has_no_seed_even_if_passed(self, image_tool):
        # GPT-Image 1.5 does not support seed — the filter must strip it.
        p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hi", "square", seed=42)
        assert "seed" not in p

    def test_gpt_image_strips_unsupported_overrides(self, image_tool):
        p = image_tool._build_fal_payload(
            "fal-ai/gpt-image-1.5", "hi", "square",
            overrides={"guidance_scale": 7.5, "num_inference_steps": 50},
        )
        assert "guidance_scale" not in p
        assert "num_inference_steps" not in p

    def test_recraft_has_minimal_payload(self, image_tool):
        # Recraft supports prompt, image_size, style only.
        p = image_tool._build_fal_payload("fal-ai/recraft-v3", "hi", "landscape")
        assert set(p.keys()) <= {"prompt", "image_size", "style"}

    def test_nano_banana_never_gets_image_size(self, image_tool):
        # Common bug: translator accidentally setting both image_size and aspect_ratio.
        p = image_tool._build_fal_payload("fal-ai/nano-banana", "hi", "landscape", seed=1)
        assert "image_size" not in p
        assert p["aspect_ratio"] == "16:9"


# ---------------------------------------------------------------------------
# Default merging
# ---------------------------------------------------------------------------

class TestDefaults:
    """Model-level defaults should carry through unless overridden."""

    def test_klein_default_steps_is_4(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hi", "square")
        assert p["num_inference_steps"] == 4

    def test_flux_2_pro_default_steps_is_50(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2-pro", "hi", "square")
        assert p["num_inference_steps"] == 50

    def test_override_replaces_default(self, image_tool):
        p = image_tool._build_fal_payload(
            "fal-ai/flux-2-pro", "hi", "square", overrides={"num_inference_steps": 25}
        )
        assert p["num_inference_steps"] == 25

    def test_none_override_does_not_replace_default(self, image_tool):
        """None values from caller should be ignored (use default)."""
        p = image_tool._build_fal_payload(
            "fal-ai/flux-2-pro", "hi", "square",
            overrides={"num_inference_steps": None},
        )
        assert p["num_inference_steps"] == 50


# ---------------------------------------------------------------------------
# GPT-Image quality is pinned to medium (not user-configurable)
# ---------------------------------------------------------------------------

class TestGptQualityPinnedToMedium:
    """GPT-Image quality is baked into the FAL_MODELS defaults at 'medium'
    and cannot be overridden via config. Pinning keeps Nous Portal billing
    predictable across all users."""

    def test_gpt_payload_always_has_medium_quality(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hi", "square")
        assert p["quality"] == "medium"

    def test_config_quality_setting_is_ignored(self, image_tool):
        """Even if a user manually edits config.yaml and adds quality_setting,
        the payload must still use medium. No code path reads that field."""
        with patch("hermes_cli.config.load_config",
                   return_value={"image_gen": {"quality_setting": "high"}}):
            p = image_tool._build_fal_payload("fal-ai/gpt-image-1.5", "hi", "square")
        assert p["quality"] == "medium"

    def test_non_gpt_model_never_gets_quality(self, image_tool):
        """quality is only meaningful for gpt-image-1.5 — other models should
        never have it in their payload."""
        for mid in image_tool.FAL_MODELS:
            if mid == "fal-ai/gpt-image-1.5":
                continue
            p = image_tool._build_fal_payload(mid, "hi", "square")
            assert "quality" not in p, f"{mid} unexpectedly has 'quality' in payload"

    def test_honors_quality_setting_flag_is_removed(self, image_tool):
        """The honors_quality_setting flag was the old override trigger.
        It must not be present on any model entry anymore."""
        for mid, meta in image_tool.FAL_MODELS.items():
            assert "honors_quality_setting" not in meta, (
                f"{mid} still has honors_quality_setting; "
                f"remove it — quality is pinned to medium"
            )

    def test_resolve_gpt_quality_function_is_gone(self, image_tool):
        """The _resolve_gpt_quality() helper was removed — quality is now
        a static default, not a runtime lookup."""
        assert not hasattr(image_tool, "_resolve_gpt_quality"), (
            "_resolve_gpt_quality should not exist — quality is pinned"
        )


# ---------------------------------------------------------------------------
# Model resolution
# ---------------------------------------------------------------------------

class TestModelResolution:

    def test_no_config_falls_back_to_default(self, image_tool):
        with patch("hermes_cli.config.load_config", return_value={}):
            mid, meta = image_tool._resolve_fal_model()
        assert mid == "fal-ai/flux-2/klein/9b"

    def test_valid_config_model_is_used(self, image_tool):
        with patch("hermes_cli.config.load_config",
                   return_value={"image_gen": {"model": "fal-ai/flux-2-pro"}}):
            mid, meta = image_tool._resolve_fal_model()
        assert mid == "fal-ai/flux-2-pro"
        assert meta["upscale"] is True  # flux-2-pro keeps backward-compat upscaling

    def test_unknown_model_falls_back_to_default_with_warning(self, image_tool, caplog):
        with patch("hermes_cli.config.load_config",
                   return_value={"image_gen": {"model": "fal-ai/nonexistent-9000"}}):
            mid, _ = image_tool._resolve_fal_model()
        assert mid == "fal-ai/flux-2/klein/9b"

    def test_env_var_fallback_when_no_config(self, image_tool, monkeypatch):
        monkeypatch.setenv("FAL_IMAGE_MODEL", "fal-ai/z-image/turbo")
        with patch("hermes_cli.config.load_config", return_value={}):
            mid, _ = image_tool._resolve_fal_model()
        assert mid == "fal-ai/z-image/turbo"

    def test_config_wins_over_env_var(self, image_tool, monkeypatch):
        monkeypatch.setenv("FAL_IMAGE_MODEL", "fal-ai/z-image/turbo")
        with patch("hermes_cli.config.load_config",
                   return_value={"image_gen": {"model": "fal-ai/nano-banana"}}):
            mid, _ = image_tool._resolve_fal_model()
        assert mid == "fal-ai/nano-banana"


# ---------------------------------------------------------------------------
# Aspect ratio handling
# ---------------------------------------------------------------------------

class TestAspectRatioNormalization:

    def test_invalid_aspect_defaults_to_landscape(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hi", "cinemascope")
        assert p["image_size"] == "landscape_16_9"

    def test_uppercase_aspect_is_normalized(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hi", "PORTRAIT")
        assert p["image_size"] == "portrait_16_9"

    def test_empty_aspect_defaults_to_landscape(self, image_tool):
        p = image_tool._build_fal_payload("fal-ai/flux-2/klein/9b", "hi", "")
        assert p["image_size"] == "landscape_16_9"


# ---------------------------------------------------------------------------
# Schema + registry integrity
# ---------------------------------------------------------------------------

class TestRegistryIntegration:

    def test_schema_exposes_only_prompt_and_aspect_ratio_to_agent(self, image_tool):
        """The agent-facing schema must stay tight — model selection is a
        user-level config choice, not an agent-level arg."""
        props = image_tool.IMAGE_GENERATE_SCHEMA["parameters"]["properties"]
        assert set(props.keys()) == {"prompt", "aspect_ratio"}

    def test_aspect_ratio_enum_is_three_values(self, image_tool):
        enum = image_tool.IMAGE_GENERATE_SCHEMA["parameters"]["properties"]["aspect_ratio"]["enum"]
        assert set(enum) == {"landscape", "square", "portrait"}


# ---------------------------------------------------------------------------
# Managed gateway 4xx translation
# ---------------------------------------------------------------------------

class _MockResponse:
    def __init__(self, status_code: int):
        self.status_code = status_code


class _MockHttpxError(Exception):
    """Simulates httpx.HTTPStatusError which exposes .response.status_code."""
    def __init__(self, status_code: int, message: str = "Bad Request"):
        super().__init__(message)
        self.response = _MockResponse(status_code)


class TestExtractHttpStatus:
    """Status-code extraction should work across exception shapes."""

    def test_extracts_from_response_attr(self, image_tool):
        exc = _MockHttpxError(403)
        assert image_tool._extract_http_status(exc) == 403

    def test_extracts_from_status_code_attr(self, image_tool):
        exc = Exception("fail")
        exc.status_code = 404  # type: ignore[attr-defined]
        assert image_tool._extract_http_status(exc) == 404

    def test_returns_none_for_non_http_exception(self, image_tool):
        assert image_tool._extract_http_status(ValueError("nope")) is None
        assert image_tool._extract_http_status(RuntimeError("nope")) is None

    def test_response_attr_without_status_code_returns_none(self, image_tool):
        class OddResponse:
            pass
        exc = Exception("weird")
        exc.response = OddResponse()  # type: ignore[attr-defined]
        assert image_tool._extract_http_status(exc) is None


class TestManagedGatewayErrorTranslation:
    """4xx from the Nous managed gateway should be translated to a user-actionable message."""

    def test_4xx_translates_to_value_error_with_remediation(self, image_tool, monkeypatch):
        """403 from managed gateway → ValueError mentioning FAL_KEY + hermes tools."""
        from unittest.mock import MagicMock

        # Simulate: managed mode active, managed submit raises 4xx.
        managed_gateway = MagicMock()
        managed_gateway.gateway_origin = "https://fal-queue-gateway.example.com"
        managed_gateway.nous_user_token = "test-token"
        monkeypatch.setattr(image_tool, "_resolve_managed_fal_gateway",
                            lambda: managed_gateway)

        bad_request = _MockHttpxError(403, "Forbidden")
        mock_managed_client = MagicMock()
        mock_managed_client.submit.side_effect = bad_request
        monkeypatch.setattr(image_tool, "_get_managed_fal_client",
                            lambda gw: mock_managed_client)

        with pytest.raises(ValueError) as exc_info:
            image_tool._submit_fal_request("fal-ai/nano-banana", {"prompt": "x"})

        msg = str(exc_info.value)
        assert "fal-ai/nano-banana" in msg
        assert "403" in msg
        assert "FAL_KEY" in msg
        assert "hermes tools" in msg
        # Original exception chained for debugging
        assert exc_info.value.__cause__ is bad_request

    def test_5xx_is_not_translated(self, image_tool, monkeypatch):
        """500s are real outages, not model-availability issues — don't rewrite them."""
        from unittest.mock import MagicMock

        managed_gateway = MagicMock()
        monkeypatch.setattr(image_tool, "_resolve_managed_fal_gateway",
                            lambda: managed_gateway)

        server_error = _MockHttpxError(502, "Bad Gateway")
        mock_managed_client = MagicMock()
        mock_managed_client.submit.side_effect = server_error
        monkeypatch.setattr(image_tool, "_get_managed_fal_client",
                            lambda gw: mock_managed_client)

        with pytest.raises(_MockHttpxError):
            image_tool._submit_fal_request("fal-ai/flux-2-pro", {"prompt": "x"})

    def test_direct_fal_errors_are_not_translated(self, image_tool, monkeypatch):
        """When user has direct FAL_KEY (managed gateway returns None), raw
        errors from fal_client bubble up unchanged — fal_client already
        provides reasonable error messages for direct usage."""
        from unittest.mock import MagicMock

        monkeypatch.setattr(image_tool, "_resolve_managed_fal_gateway",
                            lambda: None)

        direct_error = _MockHttpxError(403, "Forbidden")
        fake_fal_client = MagicMock()
        fake_fal_client.submit.side_effect = direct_error
        monkeypatch.setattr(image_tool, "fal_client", fake_fal_client)

        with pytest.raises(_MockHttpxError):
            image_tool._submit_fal_request("fal-ai/flux-2-pro", {"prompt": "x"})

    def test_non_http_exception_from_managed_bubbles_up(self, image_tool, monkeypatch):
        """Connection errors, timeouts, etc. from managed mode aren't 4xx —
        they should bubble up unchanged so callers can retry or diagnose."""
        from unittest.mock import MagicMock

        managed_gateway = MagicMock()
        monkeypatch.setattr(image_tool, "_resolve_managed_fal_gateway",
                            lambda: managed_gateway)

        conn_error = ConnectionError("network down")
        mock_managed_client = MagicMock()
        mock_managed_client.submit.side_effect = conn_error
        monkeypatch.setattr(image_tool, "_get_managed_fal_client",
                            lambda gw: mock_managed_client)

        with pytest.raises(ConnectionError):
            image_tool._submit_fal_request("fal-ai/flux-2-pro", {"prompt": "x"})