//
//  Zip.swift
//  QuickDrop
//
//  Created by Leon Böttger on 11.03.25.
//

import Foundation

enum CreateZipError: Swift.Error {
    case urlNotADirectory(URL)
    case failedToCreateZIP(Swift.Error)
}


func createZip(zipFinalURL: URL, fromDirectory directoryURL: URL) throws -> URL {
    
    guard directoryURL.isDirectory else {
        throw CreateZipError.urlNotADirectory(directoryURL)
    }
    
    var fileManagerError: Swift.Error?
    var coordinatorError: NSError?
    let coordinator = NSFileCoordinator()
    
    coordinator.coordinate(readingItemAt: directoryURL, options: .forUploading, error: &coordinatorError) { zipCreatedURL in
        do {
            // clean if file exists
            if FileManager.default.fileExists(atPath: zipFinalURL.path) {
                try FileManager.default.removeItem(at: zipFinalURL)
            }

            try FileManager.default.moveItem(at: zipCreatedURL, to: zipFinalURL)
            
        } catch {
            fileManagerError = error
        }
    }
    
    if let error = coordinatorError ?? fileManagerError {
        throw CreateZipError.failedToCreateZIP(error)
    }
    
    return zipFinalURL
}


extension URL {
    var isDirectory: Bool {
       (try? resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory == true
    }
}


func createZipAtTmp(zipFilename: String, zipExtension: String = "zip", fromDirectory directoryURL: URL) throws -> URL {
   
    let finalURL = FileManager.default.temporaryDirectory
        .appendingPathComponent(zipFilename)
        .appendingPathExtension(zipExtension)
    
    return try createZip(
        zipFinalURL: finalURL,
        fromDirectory: directoryURL
    )
}