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|
import SwiftUI
import UniformTypeIdentifiers
// MARK: - Preview Type
enum FilePreviewType: Equatable {
case unknown
case image
case text
}
/// State for a file preview download
@MainActor
@Observable
final class FilePreviewState {
// MARK: - Properties
let info: PreviewFileInfo
private var previewClient: HotlineFilePreviewClient?
private var previewTask: Task<Void, Never>?
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
// MARK: - Computed Properties
var previewType: FilePreviewType {
info.previewType
}
// MARK: - Initialization
init(info: PreviewFileInfo) {
self.info = info
}
nonisolated deinit {
// Note: Can't access @MainActor properties from deinit
// Cleanup will happen when previewClient is deallocated
}
// MARK: - Public API
func download() {
// Cancel any existing download
previewTask?.cancel()
previewClient?.cleanup()
let task = Task { @MainActor in
do {
let client = HotlineFilePreviewClient(
fileName: info.name,
address: info.address,
port: UInt16(info.port),
reference: info.id,
size: UInt32(info.size)
)
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() {
previewTask?.cancel()
previewTask = nil
previewClient?.cancel()
}
func cleanup() {
previewClient?.cleanup()
previewClient = nil
fileURL = nil
image = nil
text = nil
styledText = nil
}
// MARK: - Private Implementation
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
}
}
}
// MARK: - Load State
extension FilePreviewState {
enum LoadState: Equatable {
case unloaded
case loading
case loaded
case failed
}
}
|
