from fastapi import APIRouter, Depends, HTTPException, status, Response, Request

from sqlalchemy import select
from sqlalchemy.orm import Session

from app.core import settings
from app.core.security import (
    hash_password,
    get_token_payload,
    get_current_user,
    get_cookie_token,
    verify_password,
    create_access_token,
    set_auth_cookie,
)

from app.db import get_async_db
from app.db.models import User

from app.api.v1.schemas import UserCreate, UserRead


router = APIRouter()


# ------------------------
# User
# ------------------------

@router.post(
    "/new", 
    response_model=UserRead, 
    status_code=status.HTTP_201_CREATED, 
    tags=["Users"]
)
async def register_user(user_in: UserCreate, response: Response, db: Session = Depends(get_async_db)):

    result = await db.execute(select(User).where(User.email == user_in.email))
    if result.scalar_one_or_none():
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, 
            detail="Email already registered"
        )
    result = await db.execute(select(User).where(User.username == user_in.username))
    if result.scalar_one_or_none():
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, 
            detail="Username already registered"
        )
    
    user = User(
        username=user_in.username,
        email=user_in.email,
        hashed_password=hash_password(user_in.password),

        stats = "{}"
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)
    
    access_token = create_access_token(
        data = {"sub": str(user.id)}
    )

    set_auth_cookie(
        response,
        token=access_token,
        max_age=settings.ACCESS_TOKEN_EXPIRE_MINUTES * 60
    )
    
    return UserRead.model_validate(user)


@router.get(
    "/me",
    response_model=UserRead,
    status_code=status.HTTP_200_OK,
    tags=["Users"]
)
async def get_user(payload: dict = Depends(get_token_payload), db: Session = Depends(get_async_db)):
    user_id = payload.get('sub')
    if not user_id:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token payload"
        )
    
    result = await db.execute(select(User).where(User.id == int(user_id)))
    user = result.scalar_one_or_none()

    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )
    
    return UserRead.model_validate(user)


@router.put(
    "/me",
    response_model=UserRead,
    status_code=status.HTTP_200_OK,
    tags=["Users"]
)
async def update_user(user_in: UserCreate, payload: dict = Depends(get_token_payload), db: Session = Depends(get_async_db)):
    user_id = payload.get('sub')
    if not user_id:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token payload"
        )
    
    result = await db.execute(select(User).where(User.id == int(user_id)))
    user = result.scalar_one_or_none()

    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )
    
    if user_in.email != user.email:
        result = await db.execute(select(User).where(
            (User.email == user_in.email)
        ))
        if result.scalar_one_or_none():
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST, 
                detail="Email or username already registered"
            )
    
    if user_in.username != user.username:
        result = await db.execute(select(User).where(
            (User.username == user_in.username)
        ))
        if result.scalar_one_or_none():
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST, 
                detail="Email or username already registered"
            )

    user.username = user_in.username
    user.email = user_in.email
    user.hashed_password = hash_password(user_in.password)

    await db.commit()
    await db.refresh(user)

    return UserRead.model_validate(user)


@router.delete(
    "/me",
    status_code=status.HTTP_200_OK,
    tags=['Users']
)
async def delete_user(payload: dict = Depends(get_token_payload), db: Session = Depends(get_async_db)):
    user_id = payload.get('sub')
    if not user_id:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token payload"
        )
    
    result = await db.execute(select(User).where(User.id == int(user_id)))
    user = result.scalar_one_or_none()

    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )
    
    await db.delete(user)
    await db.commit()

    response = Response()
    response.delete_cookie(
        key="access_token",
        path="/",               # mesmo chemin que lors du set_cookie
        httponly=True,
        samesite="lax" if settings.ENV == "dev" else "strict",
        secure=settings.USE_SSL,          # mettre True en prod sur HTTPS
    )

    return response