import random
import string
from datetime import datetime, timezone

from fastapi import APIRouter, Depends, HTTPException, status
from google.oauth2 import id_token
from google.auth.transport import requests as google_requests
from sqlalchemy.orm import Session, selectinload

from app.config import settings
from app.database import get_db
from app.models.user import User
from app.models.user_profile import UserProfile
from app.schemas.auth import ForgotPasswordRequest, ResetPasswordRequest
from app.schemas.user import (
    GoogleLoginRequest,
    LoginRequest,
    LoginResponse,
    UserCreate,
    UserResponse,
)
from app.security import create_access_token, hash_password, verify_password
from app.services.auth_service import forgot_password, reset_password

router = APIRouter(prefix="/auth", tags=["auth"])


@router.post("/login", response_model=LoginResponse)
def login(data: LoginRequest, db: Session = Depends(get_db)):
    user = db.query(User).options(selectinload(User.profile)).filter(
        (User.email == data.login) | (User.username == data.login),
        User.deleted_at.is_(None),
    ).first()

    if not user or not verify_password(data.password, user.password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail={"message": "Kredensial autentikasi tidak ada atau tidak valid."},
        )

    if user.email_verified_at is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail={"message": "Email belum diverifikasi. Silakan verifikasi email terlebih dahulu."},
        )

    access_token = create_access_token({"sub": user.id})
    return LoginResponse(
        access_token=access_token,
        user=user,
    )


@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
def register(data: UserCreate, db: Session = Depends(get_db)):
    existing = db.query(User).filter(
        (User.email == data.email) | (User.username == data.username)
    ).first()
    if existing:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail={"message": "Email atau username sudah terdaftar."},
        )

    user = User(
        email=data.email,
        username=data.username,
        password=hash_password(data.password),
    )
    db.add(user)
    db.flush()

    try:
        profile = UserProfile(
            user_id=user.id,
            full_name=data.full_name,
            phone=data.phone,
            timezone=data.timezone,
        )
        db.add(profile)
        db.commit()
    except:
        db.rollback()
        raise

    db.refresh(user)
    return user


@router.post("/google-login", response_model=LoginResponse)
def google_login(data: GoogleLoginRequest, db: Session = Depends(get_db)):
    try:
        idinfo = id_token.verify_oauth2_token(
            data.credential,
            google_requests.Request(),
            settings.GOOGLE_CLIENT_ID,
        )
    except Exception:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail={"message": "Kredensial Google tidak valid atau telah kedaluwarsa."},
        )

    email = idinfo.get("email")
    name = idinfo.get("name", "")
    picture = idinfo.get("picture", "")

    if not email:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail={"message": "Tidak dapat mengambil email dari akun Google."},
        )

    user = db.query(User).options(selectinload(User.profile)).filter(
        User.email == email,
        User.deleted_at.is_(None),
    ).first()

    if not user:
        base_username = email.split("@")[0]
        username = base_username
        suffix = 1
        while db.query(User).filter(User.username == username).first():
            suffix += 1
            username = f"{base_username}{suffix}"

        random_password = "".join(random.choices(string.ascii_letters + string.digits, k=32))

        user = User(
            email=email,
            username=username,
            password=hash_password(random_password),
            email_verified_at=datetime.now(timezone.utc),
            status="ACTIVE",
        )
        db.add(user)
        db.flush()

        profile = UserProfile(
            user_id=user.id,
            full_name=name,
            timezone="Asia/Jakarta",
        )
        db.add(profile)
        db.commit()
        db.refresh(user)
    else:
        if user.email_verified_at is None:
            user.email_verified_at = datetime.now(timezone.utc)
        if not user.profile:
            profile = UserProfile(
                user_id=user.id,
                full_name=name,
                timezone="Asia/Jakarta",
            )
            db.add(profile)
        elif user.profile.full_name != name:
            user.profile.full_name = name
        db.commit()
    access_token = create_access_token({"sub": user.id})
    return LoginResponse(
        access_token=access_token,
        user=user,
    )


@router.post("/forgot-password")
def forgot_password_endpoint(data: ForgotPasswordRequest, db: Session = Depends(get_db)):
    return forgot_password(db, data.email)


@router.post("/reset-password")
def reset_password_endpoint(data: ResetPasswordRequest, db: Session = Depends(get_db)):
    return reset_password(db, data.token, data.password)