"""Comments router with RBAC and notifications."""
from typing import List
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app.core.config import get_db
from app.models import models
from app.schemas import schemas
from app.api.deps import get_current_user_or_apikey
from app.api.rbac import check_project_role
from app.models.notification import Notification as NotificationModel

router = APIRouter(tags=["Comments"])


def _notify_if_needed(db, issue_id, user_ids, ntype, title):
    """Helper to notify multiple users."""
    issue = db.query(models.Issue).filter(models.Issue.id == issue_id).first()
    if not issue:
        return
    for uid in set(user_ids):
        if uid:
            n = NotificationModel(user_id=uid, type=ntype, title=title, entity_type="issue", entity_id=issue_id)
            db.add(n)
    db.commit()


@router.post("/comments", response_model=schemas.CommentResponse, status_code=status.HTTP_201_CREATED)
def create_comment(comment: schemas.CommentCreate, db: Session = Depends(get_db), current_user: models.User = Depends(get_current_user_or_apikey)):
    # Get project_id from issue first
    issue = db.query(models.Issue).filter(models.Issue.id == comment.issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    check_project_role(db, current_user.id, issue.project_id, min_role="viewer")
    
    db_comment = models.Comment(**comment.model_dump())
    db.add(db_comment)
    db.commit()
    db.refresh(db_comment)
    
    # Notify reporter and assignee (but not the commenter themselves)
    notify_users = []
    if issue.reporter_id != current_user.id:
        notify_users.append(issue.reporter_id)
    if issue.assignee_id and issue.assignee_id != current_user.id:
        notify_users.append(issue.assignee_id)
    if notify_users:
        _notify_if_needed(db, issue.id, notify_users, "comment_added", f"New comment on: {issue.title[:50]}")
    
    return db_comment


@router.get("/issues/{issue_id}/comments", response_model=List[schemas.CommentResponse])
def list_comments(issue_id: int, db: Session = Depends(get_db)):
    return db.query(models.Comment).filter(models.Comment.issue_id == issue_id).all()


@router.patch("/comments/{comment_id}", response_model=schemas.CommentResponse)
def update_comment(comment_id: int, comment_update: schemas.CommentUpdate, db: Session = Depends(get_db), current_user: models.User = Depends(get_current_user_or_apikey)):
    comment = db.query(models.Comment).filter(models.Comment.id == comment_id).first()
    if not comment:
        raise HTTPException(status_code=404, detail="Comment not found")
    issue = db.query(models.Issue).filter(models.Issue.id == comment.issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    check_project_role(db, current_user.id, issue.project_id, min_role="viewer")
    for field, value in comment_update.model_dump(exclude_unset=True).items():
        setattr(comment, field, value)
    db.commit()
    db.refresh(comment)
    return comment


@router.delete("/comments/{comment_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_comment(comment_id: int, db: Session = Depends(get_db), current_user: models.User = Depends(get_current_user_or_apikey)):
    comment = db.query(models.Comment).filter(models.Comment.id == comment_id).first()
    if not comment:
        raise HTTPException(status_code=404, detail="Comment not found")
    # Get issue to check project role
    issue = db.query(models.Issue).filter(models.Issue.id == comment.issue_id).first()
    if not issue:
        raise HTTPException(status_code=404, detail="Issue not found")
    check_project_role(db, current_user.id, issue.project_id, min_role="dev")
    db.delete(comment)
    db.commit()
    return None