from typing import Annotated

from app.auth import validate_username
from app.config import settings
from app.database.events import Event, EventType
from app.database.user import User
from app.dependencies.database import Database
from app.dependencies.user import ClientUser
from app.utils import utcnow

from .router import router

from fastapi import Body, HTTPException
from sqlmodel import exists, select


@router.post("/rename", name="修改用户名", tags=["用户", "g0v0 API"])
async def user_rename(
    session: Database,
    new_name: Annotated[str, Body(..., description="新的用户名")],
    current_user: ClientUser,
):
    """修改用户名

    为指定用户修改用户名，并将原用户名添加到历史用户名列表中

    错误情况:
    - 404: 找不到指定用户
    - 409: 新用户名已被占用

    返回:
    - 成功: None
    """
    samename_user = (await session.exec(select(exists()).where(User.username == new_name))).first()
    if samename_user:
        raise HTTPException(409, "Username Exisits")
    errors = validate_username(new_name)
    if errors:
        raise HTTPException(403, "\n".join(errors))
    previous_username = []
    previous_username.extend(current_user.previous_usernames)
    previous_username.append(current_user.username)
    current_user.username = new_name
    current_user.previous_usernames = previous_username
    rename_event = Event(
        created_at=utcnow(),
        type=EventType.USERNAME_CHANGE,
        user_id=current_user.id,
        user=current_user,
    )
    rename_event.event_payload["user"] = {
        "username": new_name,
        "url": settings.web_url + "users/" + str(current_user.id),
        "previous_username": current_user.previous_usernames[-1],
    }
    session.add(rename_event)
    await session.commit()
    return None