"""
MIT License

Copyright (c) 2025 Hopsenn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

from functools import wraps
from django.core.cache import cache
from django.http import JsonResponse
from .validators import verify_token
from .settings import GENERATE_URL, PUBLIC_KEY

def get_builtin_key_func(name):
    if name == 'ip':
        return lambda request: request.META.get('REMOTE_ADDR', 'unknown-ip')
    raise ValueError(f"Unknown built-in key: '{name}'")

def hoptcha_protected(threshold=5, timeout=300, key='ip'):
    """
    Decorator that applies CAPTCHA verification after `threshold` failed attempts,
    tracked via cache using a customizable key. The `key` can be:
      - a string like 'ip' to use a built-in method
      - a callable that accepts a Django request and returns a string
    """

    key_func = get_builtin_key_func(key) if isinstance(key, str) else key

    def decorator(view_func):
        @wraps(view_func)
        def _wrapped_view(request, *args, **kwargs):
            key_val = key_func(request)
            cache_key = f"hoptcha-attempts:{key_val}"
            attempts = cache.get(cache_key, 0)

            if attempts >= threshold:
                token = request.POST.get("captcha_token") or request.GET.get("captcha_token")
                if not token or not verify_token(token):
                    return JsonResponse({
                        "error": "CAPTCHA",
                        "url": GENERATE_URL,
                        "key": PUBLIC_KEY
                    }, status=400)

            cache.set(cache_key, attempts + 1, timeout=timeout)
            return view_func(request, *args, **kwargs)
        return _wrapped_view
    return decorator