import hashlib
import os
import secrets
import uuid
from datetime import datetime, timedelta, timezone

import jwt
from pwdlib import PasswordHash


password_hash = PasswordHash.recommended()

JWT_SECRET = os.environ["JWT_SECRET"]
ACCESS_TOKEN_MINUTES = int(os.environ.get("ACCESS_TOKEN_MINUTES", "15"))
REFRESH_TOKEN_DAYS = int(os.environ.get("REFRESH_TOKEN_DAYS", "30"))

JWT_ALGORITHM = "HS256"


def normalize_email(email: str) -> str:
    return email.strip().lower()


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


def verify_password(password: str, hashed: str) -> bool:
    return password_hash.verify(password, hashed)


def create_access_token(
    user_id: uuid.UUID,
    session_id: uuid.UUID,
) -> str:
    now = datetime.now(timezone.utc)

    payload = {
        "sub": str(user_id),
        "sid": str(session_id),
        "iat": now,
        "exp": now + timedelta(minutes=ACCESS_TOKEN_MINUTES),
        "type": "access",
    }

    return jwt.encode(
        payload,
        JWT_SECRET,
        algorithm=JWT_ALGORITHM,
    )


def create_refresh_token() -> tuple[str, str]:
    raw = secrets.token_urlsafe(64)

    digest = hashlib.sha256(
        raw.encode("utf-8")
    ).hexdigest()

    return raw, digest


def hash_refresh_token(token: str) -> str:
    return hashlib.sha256(
        token.encode("utf-8")
    ).hexdigest()


def create_one_time_token() -> tuple[str, str]:
    raw = secrets.token_urlsafe(48)
    return raw, hashlib.sha256(raw.encode("utf-8")).hexdigest()


def hash_one_time_token(token: str) -> str:
    return hashlib.sha256(token.encode("utf-8")).hexdigest()


def refresh_expiry() -> datetime:
    return datetime.now(timezone.utc) + timedelta(
        days=REFRESH_TOKEN_DAYS
    )


def decode_access_token(token: str) -> dict:
    return jwt.decode(
        token,
        JWT_SECRET,
        algorithms=[JWT_ALGORITHM],
    )