from datetime import UTC, datetime, timedelta
from typing import Any

import bcrypt
from jose import JWTError, jwt

from app.config import get_settings

settings = get_settings()

ALGORITHM = "HS256"
TOKEN_TYPE = "access"
SESSION_PREFIX = "session:"


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


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


def create_access_token(subject: str, expires_delta: timedelta | None = None) -> str:
    expire = datetime.now(UTC) + (
        expires_delta
        if expires_delta is not None
        else timedelta(minutes=settings.access_token_expire_minutes)
    )
    payload = {
        "sub": subject,
        "exp": expire,
        "type": TOKEN_TYPE,
    }
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def decode_access_token(token: str) -> dict[str, Any] | None:
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
    except JWTError:
        return None
    if payload.get("type") != TOKEN_TYPE:
        return None
    return payload


def session_redis_key(token: str) -> str:
    return f"{SESSION_PREFIX}{token}"