from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.core.database import get_db
from app.core.security import hash_password, verify_password, create_access_token, create_refresh_token, decode_token
from app.models.user import User, UserRole
from app.schemas.user import UserRegister, UserLogin, TokenOut, RefreshRequest, UserOut

router = APIRouter()


@router.post("/register", response_model=UserOut, status_code=201)
async def register(data: UserRegister, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == data.email))
    if result.scalar_one_or_none():
        raise HTTPException(status_code=400, detail="Email already registered")

    user = User(
        email=data.email,
        hashed_password=hash_password(data.password),
        display_name=data.display_name,
        role=UserRole.PENDING,
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)
    return user


@router.post("/login", response_model=TokenOut)
async def login(data: UserLogin, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == data.email))
    user = result.scalar_one_or_none()
    if not user or not verify_password(data.password, user.hashed_password):
        raise HTTPException(status_code=401, detail="Invalid credentials")
    if not user.is_active:
        raise HTTPException(status_code=403, detail="Account deactivated")

    return TokenOut(
        access_token=create_access_token(user.id),
        refresh_token=create_refresh_token(user.id),
    )


@router.post("/refresh", response_model=TokenOut)
async def refresh(data: RefreshRequest, db: AsyncSession = Depends(get_db)):
    user_id = decode_token(data.refresh_token)
    if not user_id:
        raise HTTPException(status_code=401, detail="Invalid refresh token")

    result = await db.execute(select(User).where(User.id == user_id))
    user = result.scalar_one_or_none()
    if not user or not user.is_active:
        raise HTTPException(status_code=401, detail="User not found")

    return TokenOut(
        access_token=create_access_token(user.id),
        refresh_token=create_refresh_token(user.id),
    )