from passlib.context import CryptContext
from datetime import datetime, timedelta
from typing import Optional, Dict
import jwt
import secrets
import hashlib
import os

SECRET_KEY = os.getenv("JWT_SECRET")
ALGORITHM = os.getenv("JWT_ALGORITHM")
ACCESS_TOKEN_EXPIRE_MINUTES = os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES")
REFRESH_TOKEN_EXPIRE_DAYS = os.getenv("REFRESH_TOKEN_EXPIRE_DAYS")

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


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


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def generate_verification_token() -> str:
    return secrets.token_urlsafe(32)


def generate_reset_token() -> str:
    return secrets.token_urlsafe(32)


def hash_token(token: str) -> str:
    return hashlib.sha256(token.encode()).hexdigest()


def create_access_token(data: Dict, expires_delta: Optional[timedelta] = None) -> str:
    to_encode = data.copy()

    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)

    to_encode.update({"exp": expire, "iat": datetime.utcnow(), "type": "access"})

    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


def create_refresh_token(user_id: str) -> str:
    expire = datetime.utcnow() + timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS)

    to_encode = {
        "sub": user_id,
        "exp": expire,
        "iat": datetime.utcnow(),
        "type": "refresh",
        "jti": secrets.token_urlsafe(16),  # Unique ID
    }

    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


def decode_token(token: str) -> Optional[Dict]:
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return payload
    except jwt.ExpiredSignatureError:
        raise jwt.InvalidTokenError("Token expiré")
    except jwt.DecodeError:
        raise jwt.InvalidTokenError("Token invalide (format incorrect)")
    except jwt.InvalidTokenError as e:
        raise jwt.InvalidTokenError(f"Token invalide: {str(e)}")
    except Exception as e:
        raise jwt.InvalidTokenError(f"Erreur lors du décodage du token: {str(e)}")


def validate_password_strength(password: str) -> tuple[bool, str]:
    if len(password) < 8:
        return False, "Le mot de passe doit contenir au moins 8 caractères"

    if not any(c.isupper() for c in password):
        return False, "Le mot de passe doit contenir au moins une majuscule"

    if not any(c.islower() for c in password):
        return False, "Le mot de passe doit contenir au moins une minuscule"

    if not any(c.isdigit() for c in password):
        return False, "Le mot de passe doit contenir au moins un chiffre"

    special_chars = "!@#$%^&*()_+-=[]{}|;:,.<>?"
    if not any(c in special_chars for c in password):
        return False, "Le mot de passe doit contenir au moins un caractère spécial"

    return True, ""