import secrets
from datetime import UTC, datetime, timedelta

import bcrypt
import jwt

from app.core.config import settings

# Code alphabet excludes look-alikes (0/O, 1/I/l) to reduce paste errors.
_CODE_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"


def hash_password(password: str) -> str:
    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")


def verify_password(password: str, hashed: str) -> bool:
    try:
        return bcrypt.checkpw(password.encode("utf-8"), hashed.encode("utf-8"))
    except ValueError:
        return False


def generate_code(length: int = 8) -> str:
    return "".join(secrets.choice(_CODE_ALPHABET) for _ in range(length))


def create_access_token(subject: str, expires_minutes: int | None = None) -> str:
    minutes = (
        expires_minutes if expires_minutes is not None else settings.jwt_access_token_expire_minutes
    )
    now = datetime.now(UTC)
    payload = {
        "sub": subject,
        "iat": now,
        "exp": now + timedelta(minutes=minutes),
    }
    return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)


def decode_access_token(token: str) -> dict:
    return jwt.decode(
        token,
        settings.jwt_secret,
        algorithms=[settings.jwt_algorithm],
    )