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import SwiftUI
import UniformTypeIdentifiers
enum FilePreviewState: Equatable {
case unloaded
case loading
case loaded
case failed
}
enum FilePreviewType: Equatable {
case unknown
case image
case text
}
@Observable
final class FilePreview: HotlineFilePreviewClientDelegate {
@ObservationIgnored let info: PreviewFileInfo
@ObservationIgnored var client: HotlineFilePreviewClient? = nil
var state: FilePreviewState = .unloaded
var progress: Double = 0.0
var data: Data? = nil
#if os(iOS)
var image: UIImage? = nil
#elseif os(macOS)
var image: NSImage? = nil
#endif
var text: String? = nil
var styledText: NSAttributedString? = nil
var previewType: FilePreviewType {
let fileExtension = (info.name as NSString).pathExtension
if let fileType = UTType(filenameExtension: fileExtension) {
if fileType.isSubtype(of: .image) {
return .image
} else if fileType.isSubtype(of: .text) {
return .text
}
}
return .unknown
}
init(info: PreviewFileInfo) {
self.info = info
self.client = HotlineFilePreviewClient(
address: info.address, port: UInt16(info.port), reference: info.id, size: UInt32(info.size))
self.client?.delegate = self
}
func download() {
self.client?.start()
}
func cancel() {
self.client?.cancel()
}
func hotlineTransferStatusChanged(
client: any HotlineTransferClient, reference: UInt32, status: HotlineTransferStatus,
timeRemaining: TimeInterval
) {
print("FilePreview: Download status changed:", status)
switch status {
case .unconnected:
state = .unloaded
progress = 0.0
case .connecting:
state = .loading
progress = 0.0
case .connected:
state = .loading
progress = 0.0
case .progress(let p):
state = .loading
progress = p
case .failed(_):
state = .failed
progress = 0.0
case .completing:
state = .loading
progress = 1.0
case .completed:
state = .loaded
progress = 1.0
}
}
func hotlineFilePreviewComplete(client: HotlineFilePreviewClient, reference: UInt32, data: Data) {
self.state = .loaded
self.data = data
switch self.previewType {
case .image:
#if os(iOS)
self.image = UIImage(data: data)
#elseif os(macOS)
self.image = NSImage(data: data)
#endif
case .text:
let encoding: UInt = NSString.stringEncoding(
for: data, convertedString: nil, usedLossyConversion: nil)
if encoding != 0 {
self.text = String(data: data, encoding: String.Encoding(rawValue: encoding))
} else {
self.text = String(data: data, encoding: .utf8)
}
case .unknown:
return
}
}
}
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