//
// Copyright 2022 New Vector Ltd
//
// 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.
//

import Combine
import Foundation
import MatrixRustSDK

enum ClientProxyAction {
    case receivedSyncUpdate
    case receivedAuthError(isSoftLogout: Bool)
    case receivedDecryptionError(UnableToDecryptInfo)
    
    var isSyncUpdate: Bool {
        if case .receivedSyncUpdate = self {
            return true
        } else {
            return false
        }
    }
}

enum ClientProxyLoadingState {
    case loading
    case notLoading
}

enum ClientProxyError: Error {
    case failedCreatingRoom
    case failedRetrievingDirectRoom
    case failedRetrievingUserDisplayName
    case failedRetrievingUserAvatarURL
    case failedSettingUserDisplayName
    case failedRetrievingSessionVerificationController
    case failedLoadingMedia
    case mediaFileError
    case failedUploadingMedia(MatrixErrorCode)
    case failedSearchingUsers
    case failedGettingUserProfile
    case failedSettingUserAvatar
    case failedCheckingIsLastDevice(Error?)
    case failedIgnoringUser
    case failedUnignoringUser
    case failedJoiningRoom
}

enum SlidingSyncConstants {
    static let defaultTimelineLimit: UInt = 20
    static let maximumVisibleRangeSize = 30
}

/// This struct represents the configuration that we are using to register the application through Pusher to Sygnal
/// using the Matrix Rust SDK, more info here:
/// https://github.com/matrix-org/sygnal
struct PusherConfiguration {
    let identifiers: PusherIdentifiers
    let kind: PusherKind
    let appDisplayName: String
    let deviceDisplayName: String
    let profileTag: String?
    let lang: String
}

enum SessionVerificationState {
    case unknown
    case verified
    case unverified
}

// sourcery: AutoMockable
protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
    var actionsPublisher: AnyPublisher<ClientProxyAction, Never> { get }
    
    var loadingStatePublisher: CurrentValuePublisher<ClientProxyLoadingState, Never> { get }
    
    var verificationStatePublisher: CurrentValuePublisher<SessionVerificationState, Never> { get }
    
    var userID: String { get }

    var deviceID: String? { get }

    var homeserver: String { get }
        
    var userDisplayNamePublisher: CurrentValuePublisher<String?, Never> { get }

    var userAvatarURLPublisher: CurrentValuePublisher<URL?, Never> { get }

    /// We delay fetching this until after the first sync. Nil until then
    var ignoredUsersPublisher: CurrentValuePublisher<[String]?, Never> { get }
    
    var pusherNotificationClientIdentifier: String? { get }
    
    var roomSummaryProvider: RoomSummaryProviderProtocol? { get }
    
    /// Used for listing rooms that shouldn't be affected by the main `roomSummaryProvider` filtering
    var alternateRoomSummaryProvider: RoomSummaryProviderProtocol? { get }
    
    var inviteSummaryProvider: RoomSummaryProviderProtocol? { get }
    
    var notificationSettings: NotificationSettingsProxyProtocol { get }
    
    var secureBackupController: SecureBackupControllerProtocol { get }
    
    func isOnlyDeviceLeft() async -> Result<Bool, ClientProxyError>
    
    func startSync()

    func stopSync()
    
    func accountURL(action: AccountManagementAction) -> URL?
    
    func directRoomForUserID(_ userID: String) async -> Result<String?, ClientProxyError>
    
    func createDirectRoom(with userID: String, expectedRoomName: String?) async -> Result<String, ClientProxyError>
    
    func createRoom(name: String, topic: String?, isRoomPrivate: Bool, userIDs: [String], avatarURL: URL?) async -> Result<String, ClientProxyError>
    
    func joinRoom(_ roomID: String) async -> Result<Void, ClientProxyError>
    
    func uploadMedia(_ media: MediaInfo) async -> Result<String, ClientProxyError>
    
    func roomForIdentifier(_ identifier: String) async -> RoomProxyProtocol?
    
    @discardableResult func loadUserDisplayName() async -> Result<Void, ClientProxyError>
    
    func setUserDisplayName(_ name: String) async -> Result<Void, ClientProxyError>

    @discardableResult func loadUserAvatarURL() async -> Result<Void, ClientProxyError>
    
    func setUserAvatar(media: MediaInfo) async -> Result<Void, ClientProxyError>
    
    func removeUserAvatar() async -> Result<Void, ClientProxyError>
        
    func sessionVerificationControllerProxy() async -> Result<SessionVerificationControllerProxyProtocol, ClientProxyError>

    func logout() async -> URL?

    func setPusher(with configuration: PusherConfiguration) async throws
    
    func searchUsers(searchTerm: String, limit: UInt) async -> Result<SearchUsersResultsProxy, ClientProxyError>
    
    func profile(for userID: String) async -> Result<UserProfileProxy, ClientProxyError>
    
    func roomDirectorySearchProxy() -> RoomDirectorySearchProxyProtocol

    // MARK: - Ignored users
    
    func ignoreUser(_ userID: String) async -> Result<Void, ClientProxyError>
    
    func unignoreUser(_ userID: String) async -> Result<Void, ClientProxyError>
}
