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import SwiftUI
import UniformTypeIdentifiers
enum FilePreviewType: Equatable {
case unknown
case image
case text
}
/// State for a file preview download
@MainActor
@Observable
final class FilePreviewState {
enum LoadState: Equatable {
case unloaded
case loading
case loaded
case failed
}
let info: PreviewFileInfo
var state: LoadState = .unloaded
var progress: Double = 0.0
var fileURL: URL? = nil
#if os(iOS)
var image: UIImage? = nil
#elseif os(macOS)
var image: NSImage? = nil
#endif
var text: String? = nil
var styledText: NSAttributedString? = nil
@ObservationIgnored private var previewClient: HotlineFilePreviewClient?
@ObservationIgnored private var previewTask: Task<Void, Never>?
var previewType: FilePreviewType {
self.info.previewType
}
init(info: PreviewFileInfo) {
self.info = info
}
// MARK: - API
func download() {
// Cancel any existing download
self.previewTask?.cancel()
self.previewClient?.cleanup()
let task = Task { @MainActor in
do {
let client = HotlineFilePreviewClient(
fileName: self.info.name,
address: self.info.address,
port: UInt16(self.info.port),
reference: self.info.id,
size: UInt32(self.info.size),
fileType: self.info.type,
fileCreator: self.info.creator
)
self.previewClient = client
self.state = .loading
self.progress = 0.0
let url = try await client.preview { [weak self] progress in
guard let self else { return }
Task { @MainActor in
switch progress {
case .preparing:
self.state = .loading
self.progress = 0.0
case .connecting:
self.state = .loading
self.progress = 0.0
case .connected:
self.state = .loading
self.progress = 0.0
case .transfer(name: _, size: _, total: _, progress: let p, speed: _, estimate: _):
self.state = .loading
self.progress = p
case .completed(url: let url):
self.state = .loaded
self.progress = 1.0
self.fileURL = url
// self.loadPreview(from: url)
case .error(let error):
self.state = .failed
self.progress = 0.0
print("FilePreviewState: Download failed: \(error)")
case .unconnected:
break
}
}
}
// Final load if not already loaded
if self.state != .loaded {
self.state = .loaded
self.progress = 1.0
self.fileURL = url
// self.loadPreview(from: url)
}
} catch is CancellationError {
// Cancelled, do nothing
return
} catch {
self.state = .failed
self.progress = 0.0
print("FilePreviewState: Download error: \(error)")
}
}
self.previewTask = task
}
func cancel() {
self.previewTask?.cancel()
self.previewTask = nil
self.previewClient?.cancel()
}
func cleanup() {
self.previewClient?.cleanup()
self.previewClient = nil
self.fileURL = nil
self.image = nil
self.text = nil
self.styledText = nil
}
// MARK: - Utility
// private func loadPreview(from url: URL) {
// guard let data = try? Data(contentsOf: url) else {
// self.state = .failed
// print("FilePreviewState: Failed to read preview data from \(url.path)")
// return
// }
//
// switch self.previewType {
// case .image:
// #if os(iOS)
// self.image = UIImage(data: data)
// #elseif os(macOS)
// self.image = NSImage(data: data)
// #endif
//
// if self.image == nil {
// self.state = .failed
// print("FilePreviewState: Failed to create image from data")
// }
//
// 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)
// }
//
// if self.text == nil {
// self.state = .failed
// print("FilePreviewState: Failed to decode text data")
// }
//
// case .unknown:
// print("FilePreviewState: Unknown preview type for \(info.name)")
// break
// }
// }
}
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