import re
from uuid import UUID

from fastapi import HTTPException, status
from sqlalchemy import select
from sqlalchemy.orm import Session

from ..models import PhoneNumber, UserAccount


def normalize_phone_digits(value: str) -> str:
    digits = re.sub(r"\D", "", value.strip())
    if len(digits) > 10 and digits.startswith("91"):
        digits = digits[2:]
    if len(digits) > 10:
        digits = digits[-10:]
    return digits


def format_bonvoice_destination(value: str) -> str:
    digits = re.sub(r"\D", "", value.strip())
    if len(digits) == 10:
        return f"91{digits}"
    return digits


def require_owned_did(db: Session, user: UserAccount, from_value: str) -> PhoneNumber:
    normalized = normalize_phone_digits(from_value)
    if len(normalized) != 10:
        raise HTTPException(
            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
            detail="from must be a valid 10-digit purchased number",
        )
    number = db.scalar(
        select(PhoneNumber).where(
            PhoneNumber.user_id == user.id,
            PhoneNumber.status == "assigned",
            PhoneNumber.phone_number == normalized,
        )
    )
    if not number:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="from must be a purchased number assigned to your account",
        )
    return number

def parse_user_id(value: str) -> UUID:
    try:
        return UUID(value)
    except ValueError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid user id") from exc