// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import FlutterMacOS
import Foundation

public class SharedPreferencesPlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterPluginRegistrar) {
    let channel = FlutterMethodChannel(
      name: "plugins.flutter.io/shared_preferences",
      binaryMessenger: registrar.messenger)
    let instance = SharedPreferencesPlugin()
    registrar.addMethodCallDelegate(instance, channel: channel)
  }

  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    switch call.method {
    case "getAll":
      result(getAllPrefs())
    case "setBool",
         "setInt",
         "setDouble",
         "setString",
         "setStringList":
      let arguments = call.arguments as! [String: Any]
      let key = arguments["key"] as! String
      UserDefaults.standard.set(arguments["value"], forKey: key)
      result(true)
    case "commit":
      // UserDefaults does not need to be synchronized.
      result(true)
    case "remove":
      let arguments = call.arguments as! [String: Any]
      let key = arguments["key"] as! String
      UserDefaults.standard.removeObject(forKey: key)
      result(true)
    case "clear":
      let defaults = UserDefaults.standard
      for (key, _) in getAllPrefs() {
        defaults.removeObject(forKey: key)
      }
      result(true)
    default:
      result(FlutterMethodNotImplemented)
    }
  }
}

/// Returns all preferences stored by this plugin.
private func getAllPrefs() -> [String: Any] {
  var filteredPrefs: [String: Any] = [:]
  if let appDomain = Bundle.main.bundleIdentifier,
    let prefs = UserDefaults.standard.persistentDomain(forName: appDomain)
  {
    for (key, value) in prefs where key.hasPrefix("flutter.") {
      filteredPrefs[key] = value
    }
  }
  return filteredPrefs
}