Feat/chatppt ai studio upgrade

backend/app/generator_service.py

@@ -52,6 +52,15 @@ class GeneratorService:
     def __init__(self, ppt_service: PPTService):
         self.ppt_service = ppt_service
 
+    def apply_theme_preset(self, path: str, preset: str, output_path: str | None = None) -> tuple[str, ThemeConfig]:
+        prs = Presentation(path)
+        req = GenerateRequest(topic="theme-apply", preset=preset)
+        theme = self._select_theme(req, [])
+        self.ppt_service.apply_theme_to_presentation(prs, theme)
+        save_path = output_path or self.ppt_service._default_output(path, f"preset-{theme.name}")
+        prs.save(save_path)
+        return save_path, theme
+
     def generate(self, req: GenerateRequest) -> tuple[str, List[OutlineSlide], ThemeConfig]:
         if os.getenv("FAKE_LLM_RESPONSES", "0") == "1":
             outline = self._fake_llm_outline(req)

backend/app/main.py

@@ -2,6 +2,7 @@
 
 from fastapi import FastAPI, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 
 from .chat_service import ChatPlanner
@@ -12,6 +13,7 @@
     GenerateRequest,
     GenerateResponse,
     ThemeApplyRequest,
+    ThemePresetApplyRequest,
     UpdateRequest,
 )
 from .ppt_service import PPTService
@@ -78,6 +80,19 @@ def preview_ppt(path: str):
         raise HTTPException(status_code=400, detail=str(e))
 
 
+@app.get("/api/ppt/download")
+def download_ppt(path: str):
+    try:
+        p = Path(path)
+        if not p.exists() or not p.is_file():
+            raise HTTPException(status_code=404, detail="PPT file not found")
+        return FileResponse(path=str(p), filename=p.name, media_type="application/vnd.openxmlformats-officedocument.presentationml.presentation")
+    except HTTPException:
+        raise
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
 @app.post("/api/ppt/update")
 def update_ppt(req: UpdateRequest):
     try:
@@ -116,3 +131,20 @@ def apply_theme(req: ThemeApplyRequest):
         }
     except Exception as e:
         raise HTTPException(status_code=400, detail=str(e))
+
+
+@app.post("/api/theme/apply-preset")
+def apply_theme_preset(req: ThemePresetApplyRequest):
+    try:
+        output, theme = generator_service.apply_theme_preset(req.path, req.preset, req.output_path)
+        return {
+            "output_path": output,
+            "theme": {
+                "name": theme.name,
+                "font_name": theme.font_name,
+                "title_size_pt": theme.title_size_pt,
+                "body_size_pt": theme.body_size_pt,
+            },
+        }
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))

backend/app/models.py

@@ -44,6 +44,12 @@ class ThemeApplyRequest(BaseModel):
     output_path: Optional[str] = None
 
 
+class ThemePresetApplyRequest(BaseModel):
+    path: str
+    preset: str
+    output_path: Optional[str] = None
+
+
 class ChatResponse(BaseModel):
     plan: List[EditInstruction]
     output_path: str

backend/app/ppt_service.py

@@ -52,6 +52,12 @@ def apply_edits(self, path: str, edits: List[EditInstruction], output_path: str
             shape = slide.shapes[edit.shape_index]
             if hasattr(shape, "text"):
                 shape.text = edit.new_text
+
+        # Re-apply inferred theme after text edits so color/font style is not lost
+        # when certain PPT text boxes reset run formatting.
+        theme = self.infer_theme_for_presentation(prs)
+        self.apply_theme_to_presentation(prs, theme)
+
         save_path = output_path or self._default_output(path, "edited")
         prs.save(save_path)
         return save_path