cake_wallet/cw_mweb/ios/Classes/CwMwebPlugin.swift

import Flutter
import UIKit
import Mwebd

public class CwMwebPlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterPluginRegistrar) {
    let channel = FlutterMethodChannel(name: "cw_mweb", binaryMessenger: registrar.messenger())
    let instance = CwMwebPlugin()
    registrar.addMethodCallDelegate(instance, channel: channel)
  }

  private static var server: MwebdServer?
  private static var port: Int = 0
  private static var dataDir: String?
    
  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
      switch call.method {
      case "getPlatformVersion":
          result("iOS " + UIDevice.current.systemVersion)
      case "start":
          let args = call.arguments as? [String: String]
          let dataDir = args?["dataDir"]
          CwMwebPlugin.dataDir = dataDir
          startServer(result: result)
      case "stop":
          stopServer()
          result(nil)
      default:
          result(FlutterMethodNotImplemented)
      }
  }

  private func startServer(result: @escaping FlutterResult) {
      if CwMwebPlugin.server == nil {
          var error: NSError?
          CwMwebPlugin.server = MwebdNewServer("", CwMwebPlugin.dataDir, "", &error)
          
          if let server = CwMwebPlugin.server {
              do {
                  print("Starting server...")
                  try server.start(0, ret0_: &CwMwebPlugin.port)
                  print("Server started successfully on port: \(CwMwebPlugin.port)")
                  result(CwMwebPlugin.port)
              } catch let startError as NSError {
                  print("Server Start Error: \(startError.localizedDescription)")
                  result(FlutterError(code: "Server Start Error", message: startError.localizedDescription, details: nil))
              }
          } else if let error = error {
              print("Server Creation Error: \(error.localizedDescription)")
              result(FlutterError(code: "Server Creation Error", message: error.localizedDescription, details: nil))
          } else {
              print("Unknown Error: Failed to create server")
              result(FlutterError(code: "Unknown Error", message: "Failed to create server", details: nil))
          }
      } else {
          print("Server already running on port: \(CwMwebPlugin.port)")
          result(CwMwebPlugin.port)
      }
  }

  private func stopServer() {
      print("Stopping server")
      CwMwebPlugin.server?.stop()
      CwMwebPlugin.server = nil
      CwMwebPlugin.port = 0
  }

  deinit {
      stopServer()
  }
}