CSV

CSV

extension URL {
    static var documentsDirectory:URL {
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        let documentsDirectory = paths[0]
        let path = documentsDirectory as String
        return URL(fileURLWithPath: path, isDirectory: true)
    }
}

class ThankyouCSVDownloader {
    
    var fileSaveURL:URL {
        let dateString = DateUtil.shared.serverDateFromDate(date: .now)
        let fileName = dateString + "-" + "gift-tracker.csv"
        return URL.documentsDirectory.appendingPathComponent(fileName)
    }
    
    func downloadAndSave(client:BLAPIClient = .sharedInstance(), completion:@escaping (Error?)->Void) {
        client.getPath("../../registry/gift-tracker.csv", parameters: nil, successWithData: { data in
            DispatchQueue.global(qos: .userInitiated).async2 { [self] in
                do {
                    try data.write(to: fileSaveURL, options: [.atomic, .completeFileProtection])
                    DispatchQueue.main.async2 {
                        completion(nil)
                    }
                } catch {
                    DispatchQueue.main.async2 {
                        completion(error)
                    }
                }
            }
        }, failure: { error in
            completion(error)
        })
    }
    
    func downloadAndSaveAsync(client:BLAPIClient = .sharedInstance()) async -> Error? {
        let result = await client.asyncGet(path: "../../registry/gift-tracker.csv")
        switch result {
        case .success(let data):
            do {
                try data.write(to: fileSaveURL, options: [.atomic, .completeFileProtection])
            } catch {
                return error
            }
        case .failure(let error):
            return error
        }
        return nil
    }
    
}

class GiftReservationsV2 : ... {
    
    //...
    
    func showDownloadThankYouList_async() {
        let downloader = ThankyouCSVDownloader()
        SVProgressHUD.show()
        Task {
            let error = await downloader.downloadAndSaveAsync()
            await MainActor.run { //could use dispatch too
                SVProgressHUD.dismiss()
                if let error {
                    showAPIError(error)
                    return
                }
                self.showActivityView(downloader.fileSaveURL)
            }
        }
    }
    
    func showDownloadThankyouList_block() {
        //IMO this is cleaner. Take the thread concerns out of the VC, let the abstraction callback on main. 
        let downloader = ThankyouCSVDownloader()
        SVProgressHUD.show()
        downloader.downloadAndSave { error in
            SVProgressHUD.dismiss()
            if let error {
                self.showAPIError(error)
                return
            }
            showActivityView(downloader.fileSaveURL)
        }
    }
    
}