// This file is part of Kiwix for iOS & macOS.
//
// Kiwix 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
// any later version.
//
// Kiwix 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 Kiwix; If not, see https://www.gnu.org/licenses/.

import Foundation

fileprivate extension String {
    
    var localized: String {
        localizedWithFallback()
    }
    
    func localizedWithFormat(withArgs: CVarArg...) -> String {
        let format = localizedWithFallback()
        switch withArgs.count {
        case 1: return String.localizedStringWithFormat(format, withArgs[0])
        case 2: return String.localizedStringWithFormat(format, withArgs[0], withArgs[1])
        default: return String.localizedStringWithFormat(format, withArgs)
        }
    }
    
    private func localizedWithFallback(
        bundle: Bundle = Bundle.main,
        comment: String = ""
    ) -> String {
        let englishValue: String
        if let path = Bundle.main.path(forResource: "en", ofType: "lproj"),
           let bundle = Bundle(path: path) {
            englishValue = NSLocalizedString(self, bundle: bundle, comment: comment)
            if NSLocale.preferredLanguages.first == "en" {
                return englishValue
            }
        } else {
            englishValue = ""
        }
        return NSLocalizedString(
            self,
            tableName: nil,
            bundle: bundle,
            value: englishValue, // fall back to this, if translation not found
            comment: comment
        )
    }
}