feat: add duplicate comment prevention and video comment status check endpoints

app/routes/commend/router.py

@@ -23,6 +23,12 @@ from .youtube_service import (
     is_oauth_configured
 )
 from .gemini_service import generate_comment
+from .comment_tracker import (
+    is_video_commented,
+    mark_video_commented,
+    get_video_comment_info,
+    get_comment_stats
+)
 from ...services.logging_config import get_logger
 
 logger = get_logger(__name__)
@@ -95,6 +101,7 @@ class PostCommentResponse(BaseModel):
     message: str
     commentId: Optional[str] = None
     postedAt: Optional[str] = None
+    alreadyCommented: bool = False
 
 
 class CommendHealthResponse(BaseModel):
@@ -217,9 +224,24 @@ async def post_comment_to_youtube(request: PostCommentRequest):
 
     Note: This requires valid OAuth credentials with YouTube posting permissions.
     Comments include an AI disclaimer as required by platform policies.
+    Each video can only receive ONE comment to prevent spam/bot detection.
     """
     video_id = extract_video_id(request.videoUrl)
 
+    # Check if already commented on this video
+    if is_video_commented(video_id):
+        comment_info = get_video_comment_info(video_id)
+        logger.warning(f"Duplicate comment attempt for video: {video_id}")
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail={
+                "message": "Bu videoya zaten yorum yapılmış / Already commented on this video",
+                "alreadyCommented": True,
+                "previousCommentId": comment_info.get('comment_id') if comment_info else None,
+                "postedAt": comment_info.get('posted_at') if comment_info else None
+            }
+        )
+
     # Post to YouTube
     result, error = post_youtube_comment(video_id, request.commentText)
 
@@ -230,14 +252,50 @@ async def post_comment_to_youtube(request: PostCommentRequest):
             detail=error
         )
 
+    # Mark video as commented (for duplicate prevention)
+    video_details, _ = get_video_details(request.videoUrl)
+    video_title = video_details.get('title') if video_details else None
+    mark_video_commented(
+        video_id=video_id,
+        comment_id=result.get('commentId'),
+        video_title=video_title
+    )
+
     return PostCommentResponse(
         status="success",
         message="Comment posted successfully",
         commentId=result.get('commentId'),
-        postedAt=result.get('postedAt')
+        postedAt=result.get('postedAt'),
+        alreadyCommented=False
     )
 
 
+@router.get("/check/{video_id}")
+async def check_video_comment_status(video_id: str):
+    """
+    Check if a video has already been commented on.
+    Frontend uses this to disable the post button if already commented.
+    """
+    is_commented = is_video_commented(video_id)
+    comment_info = get_video_comment_info(video_id) if is_commented else None
+
+    return {
+        "videoId": video_id,
+        "alreadyCommented": is_commented,
+        "commentInfo": comment_info
+    }
+
+
+@router.get("/stats")
+async def get_commend_stats():
+    """Get overall comment statistics."""
+    stats = get_comment_stats()
+    return {
+        "totalComments": stats.get("total_comments", 0),
+        "lastUpdated": stats.get("last_updated")
+    }
+
+
 @router.get("/styles")
 async def get_comment_styles():
     """Get available comment styles with descriptions."""