// Copyright (c) 2018 Timofey Solomko
// Licensed under MIT License
//
// See LICENSE for license information

import Foundation
import SWCompression
import SwiftCLI

class XZCommand: Command {

    let name = "xz"
    let shortDescription = "Extracts XZ archive"

    let archive = Parameter()
    let outputPath = OptionalParameter()

    func execute() throws {
        let inputURL = URL(fileURLWithPath: self.archive.value)

        let outputURL: URL
        if let outputPath = self.outputPath.value {
            outputURL = URL(fileURLWithPath: outputPath)
        } else if inputURL.pathExtension == "xz" {
            outputURL = inputURL.deletingPathExtension()
        } else {
            print("""
                    ERROR: Unable to get output path. \
                    No output parameter was specified. \
                    Extension was: \(inputURL.pathExtension)
                    """)
            exit(1)
        }

        let fileData = try Data(contentsOf: inputURL, options: .mappedIfSafe)
        let decompressedData = try XZArchive.unarchive(archive: fileData)
        try decompressedData.write(to: outputURL)
    }

}