@preconcurrency import AVFoundation
import Foundation
import PhotosUI
import SwiftUI
import UIKit
import UniformTypeIdentifiers

extension StatusEditor {
  @MainActor
  struct UTTypeSupported {
    let value: String
    
    func loadItemContent(item: NSItemProvider) async throws -> Any? {
      if let transferable = await getVideoTransferable(item: item) {
        return transferable
      } else if let transferable = await getGifTransferable(item: item) {
        return transferable
      } else if let transferable = await getImageTansferable(item: item) {
        return transferable
      } else {
        let result = try await item.loadItem(forTypeIdentifier: value)
        if let url = result as? URL {
          return url.absoluteString
        } else if let text = result as? String {
          return text
        } else if let image = result as? UIImage {
          return image
        }
      }
      return nil
    }

    private func getVideoTransferable(item: NSItemProvider) async -> MovieFileTranseferable? {
      await withCheckedContinuation { continuation in
        _ = item.loadTransferable(type: MovieFileTranseferable.self) { result in
          switch result {
          case let .success(success):
            continuation.resume(with: .success(success))
          case .failure:
            continuation.resume(with: .success(nil))
          }
        }
      }
    }

    private func getGifTransferable(item: NSItemProvider) async -> GifFileTranseferable? {
      await withCheckedContinuation { continuation in
        _ = item.loadTransferable(type: GifFileTranseferable.self) { result in
          switch result {
          case let .success(success):
            continuation.resume(with: .success(success))
          case .failure:
            continuation.resume(with: .success(nil))
          }
        }
      }
    }

    private func getImageTansferable(item: NSItemProvider) async -> ImageFileTranseferable? {
      await withCheckedContinuation { continuation in
        _ = item.loadTransferable(type: ImageFileTranseferable.self) { result in
          switch result {
          case let .success(success):
            continuation.resume(with: .success(success))
          case .failure:
            continuation.resume(with: .success(nil))
          }
        }
      }
    }
  }
}

extension StatusEditor {
  final class MovieFileTranseferable: Transferable, Sendable {
    let url: URL

    init(url: URL) {
      self.url = url
      _ = url.startAccessingSecurityScopedResource()
    }
    
    deinit {
      url.stopAccessingSecurityScopedResource()
    }
    
    static var transferRepresentation: some TransferRepresentation {
      FileRepresentation(importedContentType: .movie) { receivedTransferrable in
        return MovieFileTranseferable(url: receivedTransferrable.localURL)
      }
      FileRepresentation(importedContentType: .video) { receivedTransferrable in
        return MovieFileTranseferable(url: receivedTransferrable.localURL)
      }
    }
  }
  
  final class GifFileTranseferable: Transferable, Sendable {
    let url: URL

    init(url: URL) {
      self.url = url
      _ = url.startAccessingSecurityScopedResource()
    }
    
    deinit {
      url.stopAccessingSecurityScopedResource()
    }
    
    var data: Data? {
      try? Data(contentsOf: url)
    }

    static var transferRepresentation: some TransferRepresentation {
      FileRepresentation(importedContentType: .gif) { receivedTransferrable in
        return GifFileTranseferable(url: receivedTransferrable.localURL)
      }
    }
  }
}

public extension StatusEditor {
  final class ImageFileTranseferable: Transferable, Sendable {
    public let url: URL
    
    init(url: URL) {
      self.url = url
      _ = url.startAccessingSecurityScopedResource()
    }
    
    deinit {
      url.stopAccessingSecurityScopedResource()
    }

    public static var transferRepresentation: some TransferRepresentation {
      FileRepresentation(importedContentType: .image) { receivedTransferrable in
        return ImageFileTranseferable(url: receivedTransferrable.localURL)
      }
    }
  }
}

public extension ReceivedTransferredFile {
  var localURL: URL {
    if self.isOriginalFile {
      return file
    }
    let copy = URL.temporaryDirectory.appending(path: "\(UUID().uuidString).\(self.file.pathExtension)")
    try? FileManager.default.copyItem(at: self.file, to: copy)
    return copy
  }

}
public extension URL {
  func mimeType() -> String {
    if let mimeType = UTType(filenameExtension: pathExtension)?.preferredMIMEType {
      mimeType
    } else {
      "application/octet-stream"
    }
  }
}

extension UIImage {
  func resized(to size: CGSize) -> UIImage {
    UIGraphicsImageRenderer(size: size).image { _ in
      draw(in: CGRect(origin: .zero, size: size))
    }
  }
}