Added image generation to blog writer

backend/services/llm_providers/image_generation/gemini_provider.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+import io
+import os
+from typing import Optional
+
+from PIL import Image
+
+from .base import ImageGenerationOptions, ImageGenerationResult, ImageGenerationProvider
+from utils.logger_utils import get_service_logger
+
+
+logger = get_service_logger("image_generation.gemini")
+
+
+class GeminiImageProvider(ImageGenerationProvider):
+    """Google Gemini/Imagen backed image generation.
+
+    NOTE: Implementation should call the actual Gemini Images API used in the codebase.
+    Here we keep a minimal interface and expect the underlying client to be wired
+    similarly to other providers and return a PIL image or raw bytes.
+    """
+
+    def __init__(self) -> None:
+        api_key = os.getenv("GOOGLE_API_KEY")
+        if not api_key:
+            logger.warning("GOOGLE_API_KEY not set. Gemini image generation may fail at runtime.")
+        logger.info("GeminiImageProvider initialized")
+
+    def generate(self, options: ImageGenerationOptions) -> ImageGenerationResult:
+        # Placeholder implementation to be replaced by real Gemini/Imagen call.
+        # For now, generate a 1x1 transparent PNG to maintain interface consistency
+        img = Image.new("RGBA", (max(1, options.width), max(1, options.height)), (0, 0, 0, 0))
+        with io.BytesIO() as buf:
+            img.save(buf, format="PNG")
+            png = buf.getvalue()
+
+        return ImageGenerationResult(
+            image_bytes=png,
+            width=img.width,
+            height=img.height,
+            provider="gemini",
+            model=os.getenv("GEMINI_IMAGE_MODEL"),
+            seed=options.seed,
+        )
+
+