from datetime import datetime, timedelta, timezone

from jose import JWTError, jwt
from passlib.context import CryptContext

from app.core.config import Settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

ALGORITHM = "HS256"
TOKEN_TYPE_USER = "user"
TOKEN_TYPE_ADMIN = "admin"


def hash_password(password: str) -> str:
    return pwd_context.hash(password)


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def create_user_access_token(user_id: int, settings: Settings) -> str:
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
    payload = {
        "sub": str(user_id),
        "exp": expire,
        "type": TOKEN_TYPE_USER,
    }
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def decode_user_access_token(token: str, settings: Settings) -> int | None:
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
    except JWTError:
        return None
    if payload.get("type") != TOKEN_TYPE_USER:
        return None
    subject = payload.get("sub")
    if not subject:
        return None
    try:
        return int(subject)
    except (TypeError, ValueError):
        return None


def create_admin_access_token(admin_id: int, settings: Settings) -> str:
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
    payload = {
        "sub": str(admin_id),
        "exp": expire,
        "type": TOKEN_TYPE_ADMIN,
    }
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def decode_admin_access_token(token: str, settings: Settings) -> int | None:
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
    except JWTError:
        return None
    if payload.get("type") != TOKEN_TYPE_ADMIN:
        return None
    subject = payload.get("sub")
    if not subject:
        return None
    try:
        return int(subject)
    except (TypeError, ValueError):
        return None