from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from typing import List
import uuid

from database import get_db
from models import Post as PostModel, Comment as CommentModel
from schemas import Comment, CreateCommentRequest, UpdateCommentRequest, Error

router = APIRouter(prefix="/posts/{postId}/comments", tags=["Comments"])


@router.get("", response_model=List[Comment])
def get_comments(postId: str, db: Session = Depends(get_db)):
    """게시물의 댓글 조회"""
    post = db.query(PostModel).filter(PostModel.id == postId).first()
    if not post:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"message": "리소스를 찾을 수 없습니다", "details": "지정된 ID의 게시물이 존재하지 않습니다"}
        )
    
    comments = db.query(CommentModel).filter(CommentModel.post_id == postId).all()
    return [{
        "id": comment.id,
        "postId": comment.post_id,
        "username": comment.username,
        "content": comment.content,
        "createdAt": comment.created_at,
        "updatedAt": comment.updated_at
    } for comment in comments]


@router.post("", response_model=Comment, status_code=status.HTTP_201_CREATED)
def create_comment(postId: str, comment_request: CreateCommentRequest, db: Session = Depends(get_db)):
    """댓글 생성"""
    post = db.query(PostModel).filter(PostModel.id == postId).first()
    if not post:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"message": "리소스를 찾을 수 없습니다", "details": "지정된 ID의 게시물이 존재하지 않습니다"}
        )
    
    comment_id = f"comment-{uuid.uuid4()}"
    new_comment = CommentModel(
        id=comment_id,
        post_id=postId,
        username=comment_request.username,
        content=comment_request.content
    )
    db.add(new_comment)
    db.commit()
    db.refresh(new_comment)
    
    return {
        "id": new_comment.id,
        "postId": new_comment.post_id,
        "username": new_comment.username,
        "content": new_comment.content,
        "createdAt": new_comment.created_at,
        "updatedAt": new_comment.updated_at
    }


@router.get("/{commentId}", response_model=Comment)
def get_comment_by_id(postId: str, commentId: str, db: Session = Depends(get_db)):
    """특정 댓글 조회"""
    comment = db.query(CommentModel).filter(
        CommentModel.id == commentId,
        CommentModel.post_id == postId
    ).first()
    if not comment:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"message": "리소스를 찾을 수 없습니다", "details": "지정된 ID의 댓글이 존재하지 않습니다"}
        )
    
    return {
        "id": comment.id,
        "postId": comment.post_id,
        "username": comment.username,
        "content": comment.content,
        "createdAt": comment.created_at,
        "updatedAt": comment.updated_at
    }


@router.patch("/{commentId}", response_model=Comment)
def update_comment(
    postId: str,
    commentId: str,
    comment_request: UpdateCommentRequest,
    db: Session = Depends(get_db)
):
    """댓글 업데이트"""
    comment = db.query(CommentModel).filter(
        CommentModel.id == commentId,
        CommentModel.post_id == postId
    ).first()
    if not comment:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"message": "리소스를 찾을 수 없습니다", "details": "지정된 ID의 댓글이 존재하지 않습니다"}
        )
    
    comment.username = comment_request.username
    comment.content = comment_request.content
    db.commit()
    db.refresh(comment)
    
    return {
        "id": comment.id,
        "postId": comment.post_id,
        "username": comment.username,
        "content": comment.content,
        "createdAt": comment.created_at,
        "updatedAt": comment.updated_at
    }


@router.delete("/{commentId}", status_code=status.HTTP_204_NO_CONTENT)
def delete_comment(postId: str, commentId: str, db: Session = Depends(get_db)):
    """댓글 삭제"""
    comment = db.query(CommentModel).filter(
        CommentModel.id == commentId,
        CommentModel.post_id == postId
    ).first()
    if not comment:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"message": "리소스를 찾을 수 없습니다", "details": "지정된 ID의 댓글이 존재하지 않습니다"}
        )
    
    db.delete(comment)
    db.commit()
    return None