/*
 Copyright (c) 2006-2021, Kurt Revis.  All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * 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.
 * Neither the name of Kurt Revis, nor Snoize, nor the names of other 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 OWNER 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.
 */

import Cocoa

extension FileManager {

    func uniqueFilename(from originalPath: String) -> String {
        let originalPathAsNSString = NSString(string: originalPath)
        let originalPathWithoutExtension = originalPathAsNSString.deletingPathExtension
        let originalPathExtension = originalPathAsNSString.pathExtension

        var testPath = originalPath
        var suffix = 0

        while fileExists(atPath: testPath) {
            suffix += 1
            let suffixedPath = originalPathWithoutExtension.appending("-\(suffix)")
            if let suffixedExtensionedPath = NSString(string: suffixedPath).appendingPathExtension(originalPathExtension) {
                testPath = suffixedExtensionedPath
            }
            else {
                // Something went wrong appending the extension. Weird.
                // Give up and return the original path; using it will cause an error.
                return originalPath
            }
        }

        return testPath
    }

}
