feat: Introduce generation parameter merging from request, Civitai, and embedded image metadata, and enhance ComfyUI metadata parsing.

tests/services/test_gen_params_merger.py

@@ -0,0 +1,59 @@
+import pytest
+from py.recipes.merger import GenParamsMerger
+
+def test_merge_priority():
+    request_params = {"prompt": "from request", "steps": 20}
+    civitai_meta = {"prompt": "from civitai", "cfg": 7.0}
+    embedded_metadata = {"gen_params": {"prompt": "from embedded", "seed": 123}}
+    
+    merged = GenParamsMerger.merge(request_params, civitai_meta, embedded_metadata)
+    
+    assert merged["prompt"] == "from request"
+    assert merged["steps"] == 20
+    assert merged["cfg"] == 7.0
+    assert merged["seed"] == 123
+
+def test_merge_no_request_params():
+    civitai_meta = {"prompt": "from civitai", "cfg": 7.0}
+    embedded_metadata = {"gen_params": {"prompt": "from embedded", "seed": 123}}
+    
+    merged = GenParamsMerger.merge(None, civitai_meta, embedded_metadata)
+    
+    assert merged["prompt"] == "from civitai"
+    assert merged["cfg"] == 7.0
+    assert merged["seed"] == 123
+
+def test_merge_only_embedded():
+    embedded_metadata = {"gen_params": {"prompt": "from embedded", "seed": 123}}
+    
+    merged = GenParamsMerger.merge(None, None, embedded_metadata)
+    
+    assert merged["prompt"] == "from embedded"
+    assert merged["seed"] == 123
+
+def test_merge_raw_embedded():
+    # Test when embedded metadata is just the gen_params themselves
+    embedded_metadata = {"prompt": "from raw embedded", "seed": 456}
+    
+    merged = GenParamsMerger.merge(None, None, embedded_metadata)
+    
+    assert merged["prompt"] == "from raw embedded"
+    assert merged["seed"] == 456
+
+def test_merge_none_values():
+    merged = GenParamsMerger.merge(None, None, None)
+    assert merged == {}
+
+def test_merge_filters_blacklisted_keys():
+    request_params = {"prompt": "test", "id": "should-be-removed"}
+    civitai_meta = {"cfg": 7, "url": "remove-me"}
+    embedded_metadata = {"seed": 123, "hash": "remove-also"}
+    
+    merged = GenParamsMerger.merge(request_params, civitai_meta, embedded_metadata)
+    
+    assert "prompt" in merged
+    assert "cfg" in merged
+    assert "seed" in merged
+    assert "id" not in merged
+    assert "url" not in merged
+    assert "hash" not in merged