Deployment Script, Postgres migration, UX improvements

backend/app/api/mix_calculator.py

@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends, HTTPException, Response, status
 from sqlalchemy.orm import Session
 
 from app.api.deps import AuthSession, require_client_module_access
@@ -13,14 +13,16 @@ from app.schemas.mix_calculator import (
 )
 from app.services.mix_calculator_service import (
     build_mix_calculator_options,
+    can_view_all_mix_calculator_sessions,
     calculate_mix_calculator_preview,
-    serialize_mix_calculator_session,
     create_mix_calculator_session,
     get_mix_calculator_session,
-    update_mix_calculator_session,
     list_mix_calculator_sessions,
-    can_view_all_mix_calculator_sessions,
+    serialize_mix_calculator_session,
+    update_mix_calculator_session,
 )
+from app.services.mix_calculator_pdf import MixCalculatorPdfUnavailableError, build_mix_calculator_pdf
+from app.services.mix_calculator_filenames import mix_calculator_pdf_filename
 
 router = APIRouter(prefix="/api/mix-calculator", tags=["mix-calculator"])
 
@@ -77,6 +79,28 @@ def read_mix_calculator_session(
     return serialize_mix_calculator_session(session_record, session)
 
 
+@router.get("/{session_id}/pdf")
+def download_mix_calculator_session_pdf(
+    session_id: int,
+    session: AuthSession = Depends(require_client_module_access("mix_calculator")),
+    db: Session = Depends(get_db),
+):
+    session_record = get_mix_calculator_session(db, auth_session=session, session_id=session_id)
+    if session_record is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Mix calculator session not found")
+
+    try:
+        pdf_bytes = build_mix_calculator_pdf(session_record)
+    except MixCalculatorPdfUnavailableError as exc:
+        raise HTTPException(status_code=status.HTTP_503_SERVICE_UNAVAILABLE, detail=str(exc)) from exc
+    filename = mix_calculator_pdf_filename(session_record)
+    return Response(
+        content=pdf_bytes,
+        media_type="application/pdf",
+        headers={"Content-Disposition": f'attachment; filename="{filename}"'},
+    )
+
+
 @router.patch("/{session_id}", response_model=MixCalculatorSessionRead)
 def patch_mix_calculator_session(
     session_id: int,