//
//  License.swift
//  
//
//  Created by Lennart Fischer on 05.06.21.
//

import Foundation

/// Some of the most popular open source licenses.
/// Source: [opensource.org](https://opensource.org)
public enum License {
    
    case MIT(year: Int, copyrightHolder: String)
    case Apache2_0(year: Int, copyrightHolder: String)
    case BSD_2_Clause(year: Int, copyrightHolder: String)
    case BSD_3_Clause(year: Int, copyrightHolder: String)
    case GPL_3_0_only(description: String, year: Int, copyrightHolder: String)
    case MPL_2_0
    
    public var text: String {
        
        switch self {
            case .MIT(let year, let copyrightHolder):
                
                return """
                Copyright \(year) \(copyrightHolder)
                
                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.
                """
                
            case .Apache2_0(let year, let copyrightHolder):
            
                return """
                Copyright \(year) \(copyrightHolder)
                
                Licensed 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.
                """
                
            case .BSD_2_Clause(let year, let copyrightHolder):
                
                return """
                Copyright \(year) \(copyrightHolder)
                
                Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
                
                1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
                
                2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
                
                THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                """
                
            case .BSD_3_Clause(let year, let copyrightHolder):
                
                return """
                Copyright \(year) \(copyrightHolder)
                
                Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
                
                1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
                
                2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
                
                3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
                
                THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                """
                
            case .GPL_3_0_only(let description, let year, let copyrightHolder):
                
                return """
                \(description)
                Copyright (C) \(year)  \(copyrightHolder)
                
                This program is free software: you can redistribute it and/or modify
                it under the terms of the GNU General Public License as published by
                the Free Software Foundation, either version 3 of the License, or
                (at your option) any later version.
                
                This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
                """
                
            case .MPL_2_0:
                
                return """
                This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
                """
        }
        
    }
    
}
