//
//  Configuration+WireGuardKit.swift
//  TunnelKit
//
//  Created by Davide De Rosa on 11/23/21.
//  Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of TunnelKit.
//
//  TunnelKit 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.
//
//  TunnelKit 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 TunnelKit.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation
import WireGuardKit

public struct ConfigurationError: Error {
    let parseError: TunnelConfiguration.ParseError
}

extension WireGuard.Configuration {
    public init(wgQuickConfig: String) throws {
        do {
            tunnelConfiguration = try TunnelConfiguration(fromWgQuickConfig: wgQuickConfig)
        } catch let parseError as TunnelConfiguration.ParseError {
            throw ConfigurationError(parseError: parseError)
        }
    }

    public func asWgQuickConfig() -> String {
        return tunnelConfiguration.asWgQuickConfig()
    }

    public var endpointRepresentation: String {
        let endpoints = tunnelConfiguration.peers.compactMap { $0.endpoint }
        if endpoints.count == 1 {
            return endpoints[0].stringRepresentation
        } else if endpoints.isEmpty {
            return "Unspecified"
        } else {
            return "Multiple endpoints"
        }
    }
}