// <copyright file="IPlayGamesClient.cs" company="Google Inc.">
// Copyright (C) 2014 Google Inc. All Rights Reserved.
//
//  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.
// </copyright>

#if UNITY_ANDROID

namespace GooglePlayGames.BasicApi
{
    using System;
    using UnityEngine.SocialPlatforms;

    /// <summary>
    /// Defines an abstract interface for a Play Games Client.
    /// </summary>
    /// <remarks>Concrete implementations
    /// might be, for example, the client for Android or for iOS. One fundamental concept
    /// that implementors of this class must adhere to is stable authentication state.
    /// This means that once Authenticate() returns true through its callback, the user is
    /// considered to be forever after authenticated while the app is running. The implementation
    /// must make sure that this is the case -- for example, it must try to silently
    /// re-authenticate the user if authentication is lost or wait for the authentication
    /// process to get fixed if it is temporarily in a bad state (such as when the
    /// Activity in Android has just been brought to the foreground and the connection to
    /// the Games services hasn't yet been established). To the user of this
    /// interface, once the user is authenticated, they're forever authenticated.
    /// Unless, of course, there is an unusual permanent failure such as the underlying
    /// service dying, in which it's acceptable that API method calls will fail.
    ///
    /// <para>All methods can be called from the game thread. The user of this interface
    /// DOES NOT NEED to call them from the UI thread of the game. Transferring to the UI
    /// thread when necessary is a responsibility of the implementors of this interface.</para>
    ///
    /// <para>CALLBACKS: all callbacks must be invoked in Unity's main thread.
    /// Implementors of this interface must guarantee that (suggestion: use
    /// <see cref="PlayGamesHelperObject.RunOnGameThread(System.Action)"/>).</para>
    /// </remarks>
    public interface IPlayGamesClient
    {
        /// <summary>
        /// Starts the authentication process.
        /// </summary>
        /// <remarks>If silent == true, no UIs will be shown
        /// (if UIs are needed, it will fail rather than show them). If silent == false,
        /// this may show UIs, consent dialogs, etc.
        /// At the end of the process, callback will be invoked to notify of the result.
        /// Once the callback returns true, the user is considered to be authenticated
        /// forever after.
        /// </remarks>
        /// <param name="silent">If set to <c>true</c> silent.</param>
        /// <param name="callback">Callback</param>
        void Authenticate(bool silent, Action<SignInStatus> callback);

        /// <summary>
        /// Returns whether or not user is authenticated.
        /// </summary>
        /// <returns><c>true</c> if the user is authenticated; otherwise, <c>false</c>.</returns>
        bool IsAuthenticated();

        /// <summary>
        /// Signs the user out.
        /// </summary>
        void SignOut();

        /// <summary>
        /// Returns the authenticated user's ID. Note that this value may change if a user signs
        /// on and signs in with a different account.
        /// </summary>
        /// <returns>The user's ID, <code>null</code> if the user is not logged in.</returns>
        string GetUserId();

        /// <summary>
        /// Loads friends of the authenticated user. This loads the entire list of friends.
        /// </summary>
        /// <param name="callback">Callback invoked when complete.  bool argument
        /// indicates success.</param>
        void LoadFriends(Action<bool> callback);

        /// <summary>
        /// Returns a human readable name for the user, if they are logged in.
        /// </summary>
        /// <returns>The user's human-readable name. <code>null</code> if they are not logged
        /// in</returns>
        string GetUserDisplayName();

        /// <summary>
        /// Returns an id token, which can be verified server side, if they are logged in.
        /// </summary>
        string GetIdToken();

        /// <summary>
        /// The server auth code for this client.
        /// </summary>
        /// <remarks>
        /// Note: This function is currently only implemented for Android.
        /// </remarks>
        string GetServerAuthCode();

        /// <summary>
        /// Gets another server auth code.
        /// </summary>
        /// <remarks>This method should be called after authenticating, and exchanging
        /// the initial server auth code for a token.  This is implemented by signing in
        /// silently, which if successful returns almost immediately and with a new
        /// server auth code.
        /// </remarks>
        /// <param name="reAuthenticateIfNeeded">Calls Authenticate if needed when
        /// retrieving another auth code. </param>
        /// <param name="callback">Callback returning the auth code, or null if there
        /// was a problem.  NOTE: This callback can be called immediately.</param>
        void GetAnotherServerAuthCode(bool reAuthenticateIfNeeded,
            Action<string> callback);

        /// <summary>
        /// Gets the user's email.
        /// </summary>
        /// <remarks>The email address returned is selected by the user from the accounts present
        /// on the device.  There is no guarantee this uniquely identifies the player.
        /// For unique identification use the id property of the local player.
        /// The user can also choose to not select any email address, meaning it is not
        /// available.
        /// </remarks>
        /// <returns>The user email or null if not authenticated or the permission is
        /// not available.</returns>
        string GetUserEmail();

        /// <summary>
        /// Returns the user's avatar url, if they are logged in and have an avatar.
        /// </summary>
        /// <returns>The URL to load the avatar image. <code>null</code> if they are not logged
        /// in</returns>
        string GetUserImageUrl();

        /// <summary>Gets the player stats.</summary>
        /// <param name="callback">Callback for response.</param>
        void GetPlayerStats(Action<CommonStatusCodes, PlayerStats> callback);

        /// <summary>
        /// Loads the users specified.  This is mainly used by the leaderboard
        /// APIs to get the information of a high scorer.
        /// </summary>
        /// <param name="userIds">User identifiers.</param>
        /// <param name="callback">Callback.</param>
        void LoadUsers(string[] userIds, Action<IUserProfile[]> callback);

        /// <summary>
        /// Loads the achievements for the current signed in user and invokes
        /// the callback.
        /// </summary>
        void LoadAchievements(Action<Achievement[]> callback);

        /// <summary>
        /// Unlocks the achievement with the passed identifier.
        /// </summary>
        /// <remarks>If the operation succeeds, the callback
        /// will be invoked on the game thread with <code>true</code>. If the operation fails, the
        /// callback will be invoked with <code>false</code>. This operation will immediately fail if
        /// the user is not authenticated (i.e. the callback will immediately be invoked with
        /// <code>false</code>). If the achievement is already unlocked, this call will
        /// succeed immediately.
        /// </remarks>
        /// <param name="achievementId">The ID of the achievement to unlock.</param>
        /// <param name="successOrFailureCalllback">Callback used to indicate whether the operation
        /// succeeded or failed.</param>
        void UnlockAchievement(string achievementId, Action<bool> successOrFailureCalllback);

        /// <summary>
        /// Reveals the achievement with the passed identifier.
        /// </summary>
        /// <remarks>If the operation succeeds, the callback
        /// will be invoked on the game thread with <code>true</code>. If the operation fails, the
        /// callback will be invoked with <code>false</code>. This operation will immediately fail if
        /// the user is not authenticated (i.e. the callback will immediately be invoked with
        /// <code>false</code>). If the achievement is already in a revealed state, this call will
        /// succeed immediately.
        /// </remarks>
        /// <param name="achievementId">The ID of the achievement to reveal.</param>
        /// <param name="successOrFailureCalllback">Callback used to indicate whether the operation
        /// succeeded or failed.</param>
        void RevealAchievement(string achievementId, Action<bool> successOrFailureCalllback);

        /// <summary>
        /// Increments the achievement with the passed identifier.
        /// </summary>
        /// <remarks>If the operation succeeds, the
        /// callback will be invoked on the game thread with <code>true</code>. If the operation fails,
        /// the  callback will be invoked with <code>false</code>. This operation will immediately fail
        /// if the user is not authenticated (i.e. the callback will immediately be invoked with
        /// <code>false</code>).
        /// </remarks>
        /// <param name="achievementId">The ID of the achievement to increment.</param>
        /// <param name="steps">The number of steps to increment by.</param>
        /// <param name="successOrFailureCalllback">Callback used to indicate whether the operation
        /// succeeded or failed.</param>
        void IncrementAchievement(string achievementId, int steps,
            Action<bool> successOrFailureCalllback);

        /// <summary>
        /// Set an achievement to have at least the given number of steps completed.
        /// </summary>
        /// <remarks>
        /// Calling this method while the achievement already has more steps than
        /// the provided value is a no-op. Once the achievement reaches the
        /// maximum number of steps, the achievement is automatically unlocked,
        /// and any further mutation operations are ignored.
        /// </remarks>
        /// <param name="achId">Ach identifier.</param>
        /// <param name="steps">Steps.</param>
        /// <param name="callback">Callback.</param>
        void SetStepsAtLeast(string achId, int steps, Action<bool> callback);

        /// <summary>
        /// Shows the appropriate platform-specific achievements UI.
        /// <param name="callback">The callback to invoke when complete.  If null,
        /// no callback is called. </param>
        /// </summary>
        void ShowAchievementsUI(Action<UIStatus> callback);

        /// <summary>
        /// Shows the appropriate platform-specific friends sharing UI.
        /// <param name="callback">The callback to invoke when complete. If null,
        /// no callback is called. </param>
        /// </summary>
        void AskForLoadFriendsResolution(Action<UIStatus> callback);

        /// <summary>
        /// Returns the latest LoadFriendsStatus obtained from loading friends.
        /// </summary>
        LoadFriendsStatus GetLastLoadFriendsStatus();

        /// <summary>
        /// Shows the Play Games Player Profile UI for a specific user identifier.
        /// </summary>
        /// <param name="otherUserId">User Identifier.</param>
        /// <param name="otherPlayerInGameName">
        /// The game's own display name of the player referred to by userId.
        /// </param>
        /// <param name="currentPlayerInGameName">
        /// The game's own display name of the current player.
        /// </param>
        /// <param name="callback">Callback invoked upon completion.</param>
        void ShowCompareProfileWithAlternativeNameHintsUI(
            string otherUserId, string otherPlayerInGameName, string currentPlayerInGameName,
            Action<UIStatus> callback);

        /// <summary>
        /// Returns if the user has allowed permission for the game to access the friends list.
        /// </summary>
        /// <param name="forceReload">If true, this call will clear any locally cached data and
        /// attempt to fetch the latest data from the server. Normally, this should be set to {@code
        /// false} to gain advantages of data caching.</param> <param name="callback">Callback
        /// invoked upon completion.</param>
        void GetFriendsListVisibility(bool forceReload,
                                      Action<FriendsListVisibilityStatus> callback);

        /// <summary>
        /// Loads the first page of the user's friends
        /// </summary>
        /// <param name="pageSize">
        /// The number of entries to request for this initial page. Note that if cached
        /// data already exists, the returned buffer may contain more than this size, but it is
        /// guaranteed to contain at least this many if the collection contains enough records.
        /// </param>
        /// <param name="forceReload">
        /// If true, this call will clear any locally cached data and attempt to
        /// fetch the latest data from the server. This would commonly be used for something like a
        /// user-initiated refresh. Normally, this should be set to {@code false} to gain advantages
        /// of data caching.</param>
        /// <param name="callback">Callback invoked upon completion.</param>
        void LoadFriends(int pageSize, bool forceReload, Action<LoadFriendsStatus> callback);

        /// <summary>
        /// Loads the friends list page
        /// </summary>
        /// <param name="pageSize">
        /// The number of entries to request for this page. Note that if cached data already
        /// exists, the returned buffer may contain more than this size, but it is guaranteed
        /// to contain at least this many if the collection contains enough records.
        /// </param>
        /// <param name="callback"></param>
        void LoadMoreFriends(int pageSize, Action<LoadFriendsStatus> callback);

        /// <summary>
        /// Shows the leaderboard UI for a specific leaderboard.
        /// </summary>
        /// <remarks>If the passed ID is <code>null</code>, all leaderboards are displayed.
        /// </remarks>
        /// <param name="leaderboardId">The leaderboard to display. <code>null</code> to display
        /// all.</param>
        /// <param name="span">Timespan to display for the leaderboard</param>
        /// <param name="callback">If non-null, the callback to invoke when the
        /// leaderboard is dismissed.
        /// </param>
        void ShowLeaderboardUI(string leaderboardId,
            LeaderboardTimeSpan span,
            Action<UIStatus> callback);

        /// <summary>
        /// Loads the score data for the given leaderboard.
        /// </summary>
        /// <param name="leaderboardId">Leaderboard identifier.</param>
        /// <param name="start">Start indicating the top scores or player centric</param>
        /// <param name="rowCount">max number of scores to return. non-positive indicates
        /// no rows should be returned.  This causes only the summary info to
        /// be loaded. This can be limited
        /// by the SDK.</param>
        /// <param name="collection">leaderboard collection: public or social</param>
        /// <param name="timeSpan">leaderboard timespan</param>
        /// <param name="callback">callback with the scores, and a page token.
        ///   The token can be used to load next/prev pages.</param>
        void LoadScores(string leaderboardId, LeaderboardStart start,
            int rowCount, LeaderboardCollection collection,
            LeaderboardTimeSpan timeSpan,
            Action<LeaderboardScoreData> callback);

        /// <summary>
        /// Loads the more scores for the leaderboard.
        /// </summary>
        /// <remarks>The token is accessed
        /// by calling LoadScores() with a positive row count.
        /// </remarks>
        /// <param name="token">Token for tracking the score loading.</param>
        /// <param name="rowCount">max number of scores to return.
        ///    This can be limited by the SDK.</param>
        /// <param name="callback">Callback.</param>
        void LoadMoreScores(ScorePageToken token, int rowCount,
            Action<LeaderboardScoreData> callback);

        /// <summary>
        /// Returns the max number of scores returned per call.
        /// </summary>
        /// <returns>The max results.</returns>
        int LeaderboardMaxResults();

        /// <summary>
        /// Submits the passed score to the passed leaderboard.
        /// </summary>
        /// <remarks>This operation will immediately fail
        /// if the user is not authenticated (i.e. the callback will immediately be invoked with
        /// <code>false</code>).
        /// </remarks>
        /// <param name="leaderboardId">Leaderboard identifier.</param>
        /// <param name="score">Score.</param>
        /// <param name="successOrFailureCalllback">Callback used to indicate whether the operation
        /// succeeded or failed.</param>
        void SubmitScore(string leaderboardId, long score,
            Action<bool> successOrFailureCalllback);

        /// <summary>
        /// Submits the score for the currently signed-in player.
        /// </summary>
        /// <param name="score">Score.</param>
        /// <param name="leaderboardId">leaderboard id.</param>
        /// <param name="metadata">metadata about the score.</param>
        /// <param name="successOrFailureCalllback">Callback upon completion.</param>
        void SubmitScore(string leaderboardId, long score, string metadata,
            Action<bool> successOrFailureCalllback);

        /// <summary>
        /// Asks user to give permissions for the given scopes.
        /// </summary>
        /// <param name="scopes">list of scopes to ask permission for</param>
        /// <param name="callback">Callback used to indicate the outcome of the operation.</param>
        void RequestPermissions(string[] scopes, Action<SignInStatus> callback);

        /// <summary>
        /// Returns whether or not user has given permissions for given scopes
        /// </summary>
        /// <seealso cref="GooglePlayGames.BasicApi.IPlayGamesClient.HasPermissions"/>
        /// <param name="scopes">list of scopes</param>
        /// <returns><c>true</c>, if given, <c>false</c> otherwise.</returns>
        bool HasPermissions(string[] scopes);

        /// <summary>
        /// Gets the saved game client.
        /// </summary>
        /// <returns>The saved game client.</returns>
        SavedGame.ISavedGameClient GetSavedGameClient();

        /// <summary>
        /// Gets the events client.
        /// </summary>
        /// <returns>The events client.</returns>
        Events.IEventsClient GetEventsClient();

        /// <summary>
        /// Gets the video client.
        /// </summary>
        /// <returns>The video client.</returns>
        Video.IVideoClient GetVideoClient();

        IUserProfile[] GetFriends();

        /// <summary>
        /// Sets the gravity for popups (Android only).
        /// </summary>
        /// <remarks>This can only be called after authentication.  It affects
        /// popups for achievements and other game services elements.</remarks>
        /// <param name="gravity">Gravity for the popup.</param>
        void SetGravityForPopups(Gravity gravity);
    }
}
#endif