// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

@testable import FirebaseAuth
import FirebaseCore
import UIKit

/// Manage FirebaseApp instances for the Sample app

class AppManager {
  static let shared = AppManager()

  private var defaultApp: FirebaseApp
  private var otherApp: FirebaseApp
  var app: FirebaseApp

  func auth() -> Auth {
    return Auth.auth(app: app)
  }

  private init() {
    defaultApp = FirebaseApp.app()!
    app = FirebaseApp.app()!
    guard let path = Bundle.main.path(forResource: "GoogleService-Info_multi", ofType: "plist"),
          let options = FirebaseOptions(contentsOfFile: path) else {
      fatalError("GoogleService-Info_multi.plist must be added to the project")
    }

    FirebaseApp.configure(name: "OtherApp", options: options)
    guard let other = FirebaseApp.app(name: "OtherApp") else {
      fatalError("Failed to find OtherApp")
    }
    otherApp = other
  }

  func toggle() {
    if app == defaultApp {
      app = otherApp
    } else {
      app = defaultApp
    }
  }
}