/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Copyright (C) 2016 ScyllaDB
 *
 * Modified by ScyllaDB
 */

/*
 * This file is part of Scylla.
 *
 * Scylla is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Scylla is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <unordered_map>
#include <boost/algorithm/string.hpp>
#include "permission.hh"

const auth::permission_set auth::permissions::ALL_DATA =
                auth::permission_set::of<auth::permission::CREATE,
                                auth::permission::ALTER, auth::permission::DROP,
                                auth::permission::SELECT,
                                auth::permission::MODIFY,
                                auth::permission::AUTHORIZE>();
const auth::permission_set auth::permissions::ALL = auth::permissions::ALL_DATA;
const auth::permission_set auth::permissions::NONE;
const auth::permission_set auth::permissions::ALTERATIONS =
                auth::permission_set::of<auth::permission::CREATE,
                                auth::permission::ALTER, auth::permission::DROP>();

static const std::unordered_map<sstring, auth::permission> permission_names({
    { "READ", auth::permission::READ },
    { "WRITE", auth::permission::WRITE  },
    { "CREATE", auth::permission::CREATE },
    { "ALTER", auth::permission::ALTER },
    { "DROP", auth::permission::DROP },
    { "SELECT", auth::permission::SELECT  },
    { "MODIFY", auth::permission::MODIFY   },
    { "AUTHORIZE", auth::permission::AUTHORIZE },
});

const sstring& auth::permissions::to_string(permission p) {
    for (auto& v : permission_names) {
        if (v.second == p) {
            return v.first;
        }
    }
    throw std::out_of_range("unknown permission");
}

auth::permission auth::permissions::from_string(const sstring& s) {
    sstring upper(s);
    boost::to_upper(upper);
    return permission_names.at(upper);
}

std::unordered_set<sstring> auth::permissions::to_strings(const permission_set& set) {
    std::unordered_set<sstring> res;
    for (auto& v : permission_names) {
        if (set.contains(v.second)) {
            res.emplace(v.first);
        }
    }
    return res;
}

auth::permission_set auth::permissions::from_strings(const std::unordered_set<sstring>& set) {
    permission_set res = auth::permissions::NONE;
    for (auto& s : set) {
        res.set(from_string(s));
    }
    return res;
}

bool auth::operator<(const permission_set& p1, const permission_set& p2) {
    return p1.mask() < p2.mask();
}