"""
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.contrib.auth import login as auth_login
from django.http import JsonResponse

from . import settings
from .validators import verify_id_token
from .utils import (
    get_jwt_tokens,
    verify_jwt_token,
    get_user_from_jwt_claims,
    refresh_access_token
)


def hopid_protected(view_func):
    @wraps(view_func)
    def _wrapped_view(request, *args, **kwargs):
        refresh_token = None
        is_session_based = False

        auth_header = request.headers.get('Authorization', '')
        if auth_header.lower().startswith('bearer '):
            access_token = auth_header.split(' ', 1)[1].strip()
        else:
            access_token = request.session.get('access_token')
            refresh_token = request.session.get('refresh_token')
            is_session_based = True

        user = None
        if access_token:
            claims = verify_jwt_token(access_token)
            user = get_user_from_jwt_claims(claims)

        if not user and is_session_based and refresh_token:
            tokens = refresh_access_token(refresh_token)
            if tokens:
                access_token = tokens.get('access_token')
                refresh_token = tokens.get('refresh_token')

                request.session['access_token'] = access_token
                request.session['refresh_token'] = refresh_token

                claims = verify_jwt_token(access_token)
                user = get_user_from_jwt_claims(claims)

        if not user:
            return JsonResponse({'detail': 'Invalid or expired token.'}, status=401)

        request.user = user
        return view_func(request, *args, **kwargs)

    return _wrapped_view


def hopid_callback(response=None):
    def decorator(view_func):
        @wraps(view_func)
        def _wrapped_view(request, *args, **kwargs):
            def fail(reason):
                if callable(response):
                    return response(request, reason)
                return view_func(request, *args, **kwargs, error=reason)

            code = request.GET.get('code')
            next = request.GET.get('next')
            if not code:
                return fail("No code returned")

            tokens = get_jwt_tokens(code, request.session.pop('pkce_verifier', ''), next)
            if tokens.get('error'):
                return fail(tokens['error'])

            access_token = tokens.get('access_token')
            id_token = tokens.get('id_token')
            if not access_token or not id_token:
                return fail("No ID token returned")

            claims = verify_id_token(id_token, access_token)
            if not claims or claims.get("nonce") != request.session.pop('oidc_nonce', None):
                return fail("Invalid or missing nonce")

            access_claims = verify_jwt_token(access_token)
            profile = get_user_from_jwt_claims(access_claims)
            if not profile:
                return fail("Invalid access token")

            request.session['access_token'] = access_token
            request.session['refresh_token'] = tokens.get('refresh_token')
            auth_login(request, profile)
            return view_func(request, *args, **kwargs)

        return _wrapped_view
    return decorator