// OpenTween - Client of Twitter
// Copyright (c) 2007-2011 kiri_feather (@kiri_feather) <kiri.feather@gmail.com>
//           (c) 2008-2011 Moz (@syo68k)
//           (c) 2008-2011 takeshik (@takeshik) <http://www.takeshik.org/>
//           (c) 2010-2011 anis774 (@anis774) <http://d.hatena.ne.jp/anis774/>
//           (c) 2010-2011 fantasticswallow (@f_swallow) <http://twitter.com/f_swallow>
//           (c) 2011      Egtra (@egtra) <http://dev.activebasic.com/egtra/>
//           (c) 2013      kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
// All rights reserved.
//
// This file is part of OpenTween.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>, or write to
// the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
// Boston, MA 02110-1301, USA.

#nullable enable

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using OpenTween.Api;
using OpenTween.Api.DataModel;
using OpenTween.Api.TwitterV2;
using OpenTween.Connection;
using OpenTween.Models;
using OpenTween.Setting;

namespace OpenTween
{
    public class Twitter : IDisposable
    {
        #region Regexp from twitter-text-js

        // The code in this region code block incorporates works covered by
        // the following copyright and permission notices:
        //
        //   Copyright 2011 Twitter, Inc.
        //
        //   Licensed under the Apache License, Version 2.0 (the "License"); you
        //   may not use this work except in compliance with the License. You
        //   may obtain a copy of the License in the LICENSE file, or 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.

        // Hashtag用正規表現
        private const string LatinAccents = @"\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0100-\u024f\u0253\u0254\u0256\u0257\u0259\u025b\u0263\u0268\u026f\u0272\u0289\u028b\u02bb\u1e00-\u1eff";
        private const string NonLatinHashtagChars = @"\u0400-\u04ff\u0500-\u0527\u1100-\u11ff\u3130-\u3185\uA960-\uA97F\uAC00-\uD7AF\uD7B0-\uD7FF";
        private const string CJHashtagCharacters = @"\u30A1-\u30FA\u30FC\u3005\uFF66-\uFF9F\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\u3041-\u309A\u3400-\u4DBF\p{IsCJKUnifiedIdeographs}";
        private const string HashtagBoundary = @"^|$|\s|「|」|。|\.|!";
        private const string HashtagAlpha = $"[A-Za-z_{LatinAccents}{NonLatinHashtagChars}{CJHashtagCharacters}]";
        private const string HashtagAlphanumeric = $"[A-Za-z0-9_{LatinAccents}{NonLatinHashtagChars}{CJHashtagCharacters}]";
        private const string HashtagTerminator = $"[^A-Za-z0-9_{LatinAccents}{NonLatinHashtagChars}{CJHashtagCharacters}]";
        public const string Hashtag = $"({HashtagBoundary})(#|＃)({HashtagAlphanumeric}*{HashtagAlpha}{HashtagAlphanumeric}*)(?={HashtagTerminator}|{HashtagBoundary})";
        // URL正規表現
        private const string UrlValidPrecedingChars = @"(?:[^A-Za-z0-9@＠$#＃\ufffe\ufeff\uffff\u202a-\u202e]|^)";
        public const string UrlInvalidWithoutProtocolPrecedingChars = @"[-_./]$";
        private const string UrlInvalidDomainChars = @"\!'#%&'\(\)*\+,\\\-\.\/:;<=>\?@\[\]\^_{|}~\$\u2000-\u200a\u0009-\u000d\u0020\u0085\u00a0\u1680\u180e\u2028\u2029\u202f\u205f\u3000\ufffe\ufeff\uffff\u202a-\u202e";
        private const string UrlValidDomainChars = $@"[^{UrlInvalidDomainChars}]";
        private const string UrlValidSubdomain = $@"(?:(?:{UrlValidDomainChars}(?:[_-]|{UrlValidDomainChars})*)?{UrlValidDomainChars}\.)";
        private const string UrlValidDomainName = $@"(?:(?:{UrlValidDomainChars}(?:-|{UrlValidDomainChars})*)?{UrlValidDomainChars}\.)";
        private const string UrlValidGTLD = @"(?:(?:aero|asia|biz|cat|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|xxx)(?=[^0-9a-zA-Z]|$))";
        private const string UrlValidCCTLD = @"(?:(?:ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|ss|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw)(?=[^0-9a-zA-Z]|$))";
        private const string UrlValidPunycode = @"(?:xn--[0-9a-z]+)";
        private const string UrlValidDomain = $@"(?<domain>{UrlValidSubdomain}*{UrlValidDomainName}(?:{UrlValidGTLD}|{UrlValidCCTLD})|{UrlValidPunycode})";
        public const string UrlValidAsciiDomain = $@"(?:(?:[a-z0-9{LatinAccents}]+)\.)+(?:{UrlValidGTLD}|{UrlValidCCTLD}|{UrlValidPunycode})";
        public const string UrlInvalidShortDomain = $"^{UrlValidDomainName}{UrlValidCCTLD}$";
        private const string UrlValidPortNumber = @"[0-9]+";

        private const string UrlValidGeneralPathChars = $@"[a-z0-9!*';:=+,.$/%#\[\]\-_~|&{LatinAccents}]";
        private const string UrlBalanceParens = $@"(?:\({UrlValidGeneralPathChars}+\))";
        private const string UrlValidPathEndingChars = $@"(?:[+\-a-z0-9=_#/{LatinAccents}]|{UrlBalanceParens})";
        private const string Pth = "(?:" +
            "(?:" +
                $"{UrlValidGeneralPathChars}*" +
                $"(?:{UrlBalanceParens}{UrlValidGeneralPathChars}*)*" +
                UrlValidPathEndingChars +
                $")|(?:@{UrlValidGeneralPathChars}+/)" +
            ")";

        private const string Qry = @"(?<query>\?[a-z0-9!?*'();:&=+$/%#\[\]\-_.,~|]*[a-z0-9_&=#/])?";
        public const string RgUrl = $@"(?<before>{UrlValidPrecedingChars})" +
                                    "(?<url>(?<protocol>https?://)?" +
                                    $"(?<domain>{UrlValidDomain})" +
                                    $"(?::{UrlValidPortNumber})?" +
                                    $"(?<path>/{Pth}*)?" +
                                    Qry +
                                    ")";

        #endregion

        /// <summary>
        /// Twitter API のステータスページのURL
        /// </summary>
        public const string ServiceAvailabilityStatusUrl = "https://api.twitterstat.us/";

        /// <summary>
        /// ツイートへのパーマリンクURLを判定する正規表現
        /// </summary>
        public static readonly Regex StatusUrlRegex = new(@"https?://([^.]+\.)?twitter\.com/(#!/)?(?<ScreenName>[a-zA-Z0-9_]+)/status(es)?/(?<StatusId>[0-9]+)(/photo)?", RegexOptions.IgnoreCase);

        /// <summary>
        /// attachment_url に指定可能な URL を判定する正規表現
        /// </summary>
        public static readonly Regex AttachmentUrlRegex = new(
            @"https?://(
   twitter\.com/[0-9A-Za-z_]+/status/[0-9]+
 | mobile\.twitter\.com/[0-9A-Za-z_]+/status/[0-9]+
 | twitter\.com/messages/compose\?recipient_id=[0-9]+(&.+)?
)$",
            RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

        /// <summary>
        /// FavstarやaclogなどTwitter関連サービスのパーマリンクURLからステータスIDを抽出する正規表現
        /// </summary>
        public static readonly Regex ThirdPartyStatusUrlRegex = new(
            @"https?://(?:[^.]+\.)?(?:
  favstar\.fm/users/[a-zA-Z0-9_]+/status/       # Favstar
| favstar\.fm/t/                                # Favstar (short)
| aclog\.koba789\.com/i/                        # aclog
| frtrt\.net/solo_status\.php\?status=          # RtRT
)(?<StatusId>[0-9]+)",
            RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

        /// <summary>
        /// DM送信かどうかを判定する正規表現
        /// </summary>
        public static readonly Regex DMSendTextRegex = new(@"^DM? +(?<id>[a-zA-Z0-9_]+) +(?<body>.*)", RegexOptions.IgnoreCase | RegexOptions.Singleline);

        public TwitterApi Api { get; }

        public TwitterConfiguration Configuration { get; private set; }

        public TwitterTextConfiguration TextConfiguration { get; private set; }

        public bool GetFollowersSuccess { get; private set; } = false;

        public bool GetNoRetweetSuccess { get; private set; } = false;

        private delegate void GetIconImageDelegate(PostClass post);

        private readonly object lockObj = new();
        private ISet<long> followerId = new HashSet<long>();
        private long[] noRTId = Array.Empty<long>();

        private readonly TwitterPostFactory postFactory;

        private string? nextCursorDirectMessage = null;

        private long previousStatusId = -1L;

        public Twitter(TwitterApi api)
        {
            this.postFactory = new(TabInformations.GetInstance());

            this.Api = api;
            this.Configuration = TwitterConfiguration.DefaultConfiguration();
            this.TextConfiguration = TwitterTextConfiguration.DefaultConfiguration();
        }

        public TwitterApiAccessLevel AccessLevel
            => MyCommon.TwitterApiInfo.AccessLevel;

        protected void ResetApiStatus()
            => MyCommon.TwitterApiInfo.Reset();

        public void ClearAuthInfo()
        {
            Twitter.AccountState = MyCommon.ACCOUNT_STATE.Invalid;
            this.ResetApiStatus();
        }

        public void VerifyCredentials()
        {
            try
            {
                this.VerifyCredentialsAsync().Wait();
            }
            catch (AggregateException ex) when (ex.InnerException is WebApiException)
            {
                throw new WebApiException(ex.InnerException.Message, ex);
            }
        }

        public async Task VerifyCredentialsAsync()
        {
            var user = await this.Api.AccountVerifyCredentials()
                .ConfigureAwait(false);

            this.UpdateUserStats(user);
        }

        public void Initialize(string token, string tokenSecret, string username, long userId)
        {
            // OAuth認証
            if (MyCommon.IsNullOrEmpty(token) || MyCommon.IsNullOrEmpty(tokenSecret) || MyCommon.IsNullOrEmpty(username))
            {
                Twitter.AccountState = MyCommon.ACCOUNT_STATE.Invalid;
            }
            this.ResetApiStatus();
            this.Api.Initialize(token, tokenSecret, userId, username);
        }

        public void Initialize(TwitterAppToken appToken, string token, string tokenSecret, string username, long userId)
        {
            // OAuth認証
            if (MyCommon.IsNullOrEmpty(token) || MyCommon.IsNullOrEmpty(tokenSecret) || MyCommon.IsNullOrEmpty(username))
            {
                Twitter.AccountState = MyCommon.ACCOUNT_STATE.Invalid;
            }
            this.ResetApiStatus();
            this.Api.Initialize(appToken, token, tokenSecret, userId, username);
        }

        public async Task<PostClass?> PostStatus(PostStatusParams param)
        {
            this.CheckAccountState();

            if (Twitter.DMSendTextRegex.IsMatch(param.Text))
            {
                var mediaId = param.MediaIds != null && param.MediaIds.Any() ? param.MediaIds[0] : (long?)null;

                await this.SendDirectMessage(param.Text, mediaId)
                    .ConfigureAwait(false);
                return null;
            }

            var response = await this.Api.StatusesUpdate(
                    param.Text,
                    param.InReplyToStatusId,
                    param.MediaIds,
                    param.AutoPopulateReplyMetadata,
                    param.ExcludeReplyUserIds,
                    param.AttachmentUrl
                )
                .ConfigureAwait(false);

            var status = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            this.UpdateUserStats(status.User);

            if (status.Id == this.previousStatusId)
                throw new WebApiException("OK:Delaying?");

            this.previousStatusId = status.Id;

            // 投稿したものを返す
            var post = this.CreatePostsFromStatusData(status);
            if (this.ReadOwnPost) post.IsRead = true;
            return post;
        }

        public async Task<long> UploadMedia(IMediaItem item, string? mediaCategory = null)
        {
            this.CheckAccountState();

            var mediaType = item.Extension switch
            {
                ".png" => "image/png",
                ".jpg" => "image/jpeg",
                ".jpeg" => "image/jpeg",
                ".gif" => "image/gif",
                _ => "application/octet-stream",
            };

            var initResponse = await this.Api.MediaUploadInit(item.Size, mediaType, mediaCategory)
                .ConfigureAwait(false);

            var initMedia = await initResponse.LoadJsonAsync()
                .ConfigureAwait(false);

            var mediaId = initMedia.MediaId;

            await this.Api.MediaUploadAppend(mediaId, 0, item)
                .ConfigureAwait(false);

            var response = await this.Api.MediaUploadFinalize(mediaId)
                .ConfigureAwait(false);

            var media = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            while (media.ProcessingInfo is TwitterUploadMediaResult.MediaProcessingInfo processingInfo)
            {
                switch (processingInfo.State)
                {
                    case "pending":
                        break;
                    case "in_progress":
                        break;
                    case "succeeded":
                        goto succeeded;
                    case "failed":
                        throw new WebApiException($"Err:Upload failed ({processingInfo.Error?.Name})");
                    default:
                        throw new WebApiException($"Err:Invalid state ({processingInfo.State})");
                }

                await Task.Delay(TimeSpan.FromSeconds(processingInfo.CheckAfterSecs ?? 5))
                    .ConfigureAwait(false);

                media = await this.Api.MediaUploadStatus(mediaId)
                    .ConfigureAwait(false);
            }

            succeeded:
            return media.MediaId;
        }

        public async Task SendDirectMessage(string postStr, long? mediaId = null)
        {
            this.CheckAccountState();
            this.CheckAccessLevel(TwitterApiAccessLevel.ReadWriteAndDirectMessage);

            var mc = Twitter.DMSendTextRegex.Match(postStr);

            var body = mc.Groups["body"].Value;
            var recipientName = mc.Groups["id"].Value;

            var recipient = await this.Api.UsersShow(recipientName)
                .ConfigureAwait(false);

            var response = await this.Api.DirectMessagesEventsNew(recipient.Id, body, mediaId)
                .ConfigureAwait(false);

            var messageEventSingle = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            await this.CreateDirectMessagesEventFromJson(messageEventSingle, read: true)
                .ConfigureAwait(false);
        }

        public async Task<PostClass?> PostRetweet(long id, bool read)
        {
            this.CheckAccountState();

            // データ部分の生成
            var post = TabInformations.GetInstance()[id];
            if (post == null)
                throw new WebApiException("Err:Target isn't found.");

            var target = post.RetweetedId ?? id;  // 再RTの場合は元発言をRT

            var response = await this.Api.StatusesRetweet(target)
                .ConfigureAwait(false);

            var status = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            // 二重取得回避
            lock (this.lockObj)
            {
                if (TabInformations.GetInstance().ContainsKey(status.Id))
                    return null;
            }

            // Retweet判定
            if (status.RetweetedStatus == null)
                throw new WebApiException("Invalid Json!");

            // Retweetしたものを返す
            post = this.CreatePostsFromStatusData(status);

            // ユーザー情報
            post.IsMe = true;

            post.IsRead = read;
            post.IsOwl = false;
            if (this.ReadOwnPost) post.IsRead = true;
            post.IsDm = false;

            return post;
        }

        public string Username
            => this.Api.CurrentScreenName;

        public long UserId
            => this.Api.CurrentUserId;

        public static MyCommon.ACCOUNT_STATE AccountState { get; set; } = MyCommon.ACCOUNT_STATE.Valid;

        public bool RestrictFavCheck { get; set; }

        public bool ReadOwnPost { get; set; }

        public int FollowersCount { get; private set; }

        public int FriendsCount { get; private set; }

        public int StatusesCount { get; private set; }

        public string Location { get; private set; } = "";

        public string Bio { get; private set; } = "";

        /// <summary>ユーザーのフォロワー数などの情報を更新します</summary>
        private void UpdateUserStats(TwitterUser self)
        {
            this.FollowersCount = self.FollowersCount;
            this.FriendsCount = self.FriendsCount;
            this.StatusesCount = self.StatusesCount;
            this.Location = self.Location ?? "";
            this.Bio = self.Description ?? "";
        }

        /// <summary>
        /// 渡された取得件数がWORKERTYPEに応じた取得可能範囲に収まっているか検証する
        /// </summary>
        public static bool VerifyApiResultCount(MyCommon.WORKERTYPE type, int count)
            => count >= 20 && count <= GetMaxApiResultCount(type);

        /// <summary>
        /// 渡された取得件数が更新時の取得可能範囲に収まっているか検証する
        /// </summary>
        public static bool VerifyMoreApiResultCount(int count)
            => count >= 20 && count <= 200;

        /// <summary>
        /// 渡された取得件数が起動時の取得可能範囲に収まっているか検証する
        /// </summary>
        public static bool VerifyFirstApiResultCount(int count)
            => count >= 20 && count <= 200;

        /// <summary>
        /// WORKERTYPEに応じた取得可能な最大件数を取得する
        /// </summary>
        public static int GetMaxApiResultCount(MyCommon.WORKERTYPE type)
        {
            // 参照: REST APIs - 各endpointのcountパラメータ
            // https://dev.twitter.com/rest/public
            return type switch
            {
                MyCommon.WORKERTYPE.Timeline => 100,
                MyCommon.WORKERTYPE.Reply => 200,
                MyCommon.WORKERTYPE.UserTimeline => 200,
                MyCommon.WORKERTYPE.Favorites => 200,
                MyCommon.WORKERTYPE.List => 200, // 不明
                MyCommon.WORKERTYPE.PublicSearch => 100,
                _ => throw new InvalidOperationException("Invalid type: " + type),
            };
        }

        /// <summary>
        /// WORKERTYPEに応じた取得件数を取得する
        /// </summary>
        public static int GetApiResultCount(MyCommon.WORKERTYPE type, bool more, bool startup)
        {
            if (SettingManager.Instance.Common.UseAdditionalCount)
            {
                switch (type)
                {
                    case MyCommon.WORKERTYPE.Favorites:
                        if (SettingManager.Instance.Common.FavoritesCountApi != 0)
                            return SettingManager.Instance.Common.FavoritesCountApi;
                        break;
                    case MyCommon.WORKERTYPE.List:
                        if (SettingManager.Instance.Common.ListCountApi != 0)
                            return SettingManager.Instance.Common.ListCountApi;
                        break;
                    case MyCommon.WORKERTYPE.PublicSearch:
                        if (SettingManager.Instance.Common.SearchCountApi != 0)
                            return SettingManager.Instance.Common.SearchCountApi;
                        break;
                    case MyCommon.WORKERTYPE.UserTimeline:
                        if (SettingManager.Instance.Common.UserTimelineCountApi != 0)
                            return SettingManager.Instance.Common.UserTimelineCountApi;
                        break;
                }
                if (more && SettingManager.Instance.Common.MoreCountApi != 0)
                {
                    return Math.Min(SettingManager.Instance.Common.MoreCountApi, GetMaxApiResultCount(type));
                }
                if (startup && SettingManager.Instance.Common.FirstCountApi != 0 && type != MyCommon.WORKERTYPE.Reply)
                {
                    return Math.Min(SettingManager.Instance.Common.FirstCountApi, GetMaxApiResultCount(type));
                }
            }

            // 上記に当てはまらない場合の共通処理
            var count = SettingManager.Instance.Common.CountApi;

            if (type == MyCommon.WORKERTYPE.Reply)
                count = SettingManager.Instance.Common.CountApiReply;

            return Math.Min(count, GetMaxApiResultCount(type));
        }

        public async Task GetHomeTimelineApi(bool read, HomeTabModel tab, bool more, bool startup)
        {
            this.CheckAccountState();

            var count = GetApiResultCount(MyCommon.WORKERTYPE.Timeline, more, startup);

            TwitterStatus[] statuses;
            if (SettingManager.Instance.Common.EnableTwitterV2Api)
            {
                var request = new GetTimelineRequest(this.UserId)
                {
                    MaxResults = count,
                    UntilId = more ? tab.OldestId.ToString() : null,
                };

                var response = await request.Send(this.Api.Connection)
                    .ConfigureAwait(false);

                if (response.Data == null || response.Data.Length == 0)
                    return;

                var tweetIds = response.Data.Select(x => x.Id).ToList();

                statuses = await this.Api.StatusesLookup(tweetIds)
                    .ConfigureAwait(false);
            }
            else
            {
                var maxId = more ? tab.OldestId : (long?)null;

                statuses = await this.Api.StatusesHomeTimeline(count, maxId)
                    .ConfigureAwait(false);
            }

            var minimumId = this.CreatePostsFromJson(statuses, MyCommon.WORKERTYPE.Timeline, tab, read);
            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        public async Task GetMentionsTimelineApi(bool read, MentionsTabModel tab, bool more, bool startup)
        {
            this.CheckAccountState();

            var count = GetApiResultCount(MyCommon.WORKERTYPE.Reply, more, startup);

            TwitterStatus[] statuses;
            if (more)
            {
                statuses = await this.Api.StatusesMentionsTimeline(count, maxId: tab.OldestId)
                    .ConfigureAwait(false);
            }
            else
            {
                statuses = await this.Api.StatusesMentionsTimeline(count)
                    .ConfigureAwait(false);
            }

            var minimumId = this.CreatePostsFromJson(statuses, MyCommon.WORKERTYPE.Reply, tab, read);
            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        public async Task GetUserTimelineApi(bool read, string userName, UserTimelineTabModel tab, bool more)
        {
            this.CheckAccountState();

            var count = GetApiResultCount(MyCommon.WORKERTYPE.UserTimeline, more, false);

            TwitterStatus[] statuses;
            if (MyCommon.IsNullOrEmpty(userName))
            {
                var target = tab.ScreenName;
                if (MyCommon.IsNullOrEmpty(target)) return;
                userName = target;
                statuses = await this.Api.StatusesUserTimeline(userName, count)
                    .ConfigureAwait(false);
            }
            else
            {
                if (more)
                {
                    statuses = await this.Api.StatusesUserTimeline(userName, count, maxId: tab.OldestId)
                        .ConfigureAwait(false);
                }
                else
                {
                    statuses = await this.Api.StatusesUserTimeline(userName, count)
                        .ConfigureAwait(false);
                }
            }

            var minimumId = this.CreatePostsFromJson(statuses, MyCommon.WORKERTYPE.UserTimeline, tab, read);

            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        public async Task<PostClass> GetStatusApi(bool read, long id)
        {
            this.CheckAccountState();

            var status = await this.Api.StatusesShow(id)
                .ConfigureAwait(false);

            var item = this.CreatePostsFromStatusData(status);

            item.IsRead = read;
            if (item.IsMe && !read && this.ReadOwnPost) item.IsRead = true;

            return item;
        }

        public async Task GetStatusApi(bool read, long id, TabModel tab)
        {
            var post = await this.GetStatusApi(read, id)
                .ConfigureAwait(false);

            // 非同期アイコン取得＆StatusDictionaryに追加
            if (tab != null && tab.IsInnerStorageTabType)
                tab.AddPostQueue(post);
            else
                TabInformations.GetInstance().AddPost(post);
        }

        private PostClass CreatePostsFromStatusData(TwitterStatus status)
            => this.CreatePostsFromStatusData(status, favTweet: false);

        private PostClass CreatePostsFromStatusData(TwitterStatus status, bool favTweet)
            => this.postFactory.CreateFromStatus(status, this.UserId, this.followerId, favTweet);

        private long? CreatePostsFromJson(TwitterStatus[] items, MyCommon.WORKERTYPE gType, TabModel? tab, bool read)
        {
            long? minimumId = null;

            foreach (var status in items)
            {
                if (minimumId == null || minimumId.Value > status.Id)
                    minimumId = status.Id;

                // 二重取得回避
                lock (this.lockObj)
                {
                    if (tab == null)
                    {
                        if (TabInformations.GetInstance().ContainsKey(status.Id)) continue;
                    }
                    else
                    {
                        if (tab.Contains(status.Id)) continue;
                    }
                }

                // RT禁止ユーザーによるもの
                if (gType != MyCommon.WORKERTYPE.UserTimeline &&
                    status.RetweetedStatus != null && this.noRTId.Contains(status.User.Id)) continue;

                var post = this.CreatePostsFromStatusData(status);

                post.IsRead = read;
                if (post.IsMe && !read && this.ReadOwnPost) post.IsRead = true;

                if (tab != null && tab.IsInnerStorageTabType)
                    tab.AddPostQueue(post);
                else
                    TabInformations.GetInstance().AddPost(post);
            }

            return minimumId;
        }

        private long? CreatePostsFromSearchJson(TwitterSearchResult items, PublicSearchTabModel tab, bool read, bool more)
        {
            long? minimumId = null;

            foreach (var status in items.Statuses)
            {
                if (minimumId == null || minimumId.Value > status.Id)
                    minimumId = status.Id;

                if (!more && status.Id > tab.SinceId) tab.SinceId = status.Id;
                // 二重取得回避
                lock (this.lockObj)
                {
                    if (tab.Contains(status.Id)) continue;
                }

                var post = this.CreatePostsFromStatusData(status);

                post.IsRead = read;
                if ((post.IsMe && !read) && this.ReadOwnPost) post.IsRead = true;

                tab.AddPostQueue(post);
            }

            return minimumId;
        }

        private long? CreateFavoritePostsFromJson(TwitterStatus[] items, bool read)
        {
            var favTab = TabInformations.GetInstance().FavoriteTab;
            long? minimumId = null;

            foreach (var status in items)
            {
                if (minimumId == null || minimumId.Value > status.Id)
                    minimumId = status.Id;

                // 二重取得回避
                lock (this.lockObj)
                {
                    if (favTab.Contains(status.Id)) continue;
                }

                var post = this.CreatePostsFromStatusData(status, true);

                post.IsRead = read;

                TabInformations.GetInstance().AddPost(post);
            }

            return minimumId;
        }

        public async Task GetListStatus(bool read, ListTimelineTabModel tab, bool more, bool startup)
        {
            var count = GetApiResultCount(MyCommon.WORKERTYPE.List, more, startup);

            TwitterStatus[] statuses;
            if (more)
            {
                statuses = await this.Api.ListsStatuses(tab.ListInfo.Id, count, maxId: tab.OldestId, includeRTs: SettingManager.Instance.Common.IsListsIncludeRts)
                    .ConfigureAwait(false);
            }
            else
            {
                statuses = await this.Api.ListsStatuses(tab.ListInfo.Id, count, includeRTs: SettingManager.Instance.Common.IsListsIncludeRts)
                    .ConfigureAwait(false);
            }

            var minimumId = this.CreatePostsFromJson(statuses, MyCommon.WORKERTYPE.List, tab, read);

            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        /// <summary>
        /// startStatusId からリプライ先の発言を辿る。発言は posts 以外からは検索しない。
        /// </summary>
        /// <returns>posts の中から検索されたリプライチェインの末端</returns>
        internal static PostClass FindTopOfReplyChain(IDictionary<long, PostClass> posts, long startStatusId)
        {
            if (!posts.ContainsKey(startStatusId))
                throw new ArgumentException("startStatusId (" + startStatusId + ") が posts の中から見つかりませんでした。", nameof(startStatusId));

            var nextPost = posts[startStatusId];
            while (nextPost.InReplyToStatusId != null)
            {
                if (!posts.ContainsKey(nextPost.InReplyToStatusId.Value))
                    break;
                nextPost = posts[nextPost.InReplyToStatusId.Value];
            }

            return nextPost;
        }

        public async Task GetRelatedResult(bool read, RelatedPostsTabModel tab)
        {
            var targetPost = tab.TargetPost;

            if (targetPost.RetweetedId != null)
            {
                var originalPost = targetPost.Clone();
                originalPost.StatusId = targetPost.RetweetedId.Value;
                originalPost.RetweetedId = null;
                originalPost.RetweetedBy = null;
                targetPost = originalPost;
            }

            var relPosts = new Dictionary<long, PostClass>();
            if (targetPost.TextFromApi.Contains("@") && targetPost.InReplyToStatusId == null)
            {
                // 検索結果対応
                var p = TabInformations.GetInstance()[targetPost.StatusId];
                if (p != null && p.InReplyToStatusId != null)
                {
                    targetPost = p;
                }
                else
                {
                    p = await this.GetStatusApi(read, targetPost.StatusId)
                        .ConfigureAwait(false);
                    targetPost = p;
                }
            }
            relPosts.Add(targetPost.StatusId, targetPost);

            Exception? lastException = null;

            // in_reply_to_status_id を使用してリプライチェインを辿る
            var nextPost = FindTopOfReplyChain(relPosts, targetPost.StatusId);
            var loopCount = 1;
            while (nextPost.InReplyToStatusId != null && loopCount++ <= 20)
            {
                var inReplyToId = nextPost.InReplyToStatusId.Value;

                var inReplyToPost = TabInformations.GetInstance()[inReplyToId];
                if (inReplyToPost == null)
                {
                    try
                    {
                        inReplyToPost = await this.GetStatusApi(read, inReplyToId)
                            .ConfigureAwait(false);
                    }
                    catch (WebApiException ex)
                    {
                        lastException = ex;
                        break;
                    }
                }

                relPosts.Add(inReplyToPost.StatusId, inReplyToPost);

                nextPost = FindTopOfReplyChain(relPosts, nextPost.StatusId);
            }

            // MRTとかに対応のためツイート内にあるツイートを指すURLを取り込む
            var text = targetPost.Text;
            var ma = Twitter.StatusUrlRegex.Matches(text).Cast<Match>()
                .Concat(Twitter.ThirdPartyStatusUrlRegex.Matches(text).Cast<Match>());
            foreach (var match in ma)
            {
                if (long.TryParse(match.Groups["StatusId"].Value, out var statusId))
                {
                    if (relPosts.ContainsKey(statusId))
                        continue;

                    var p = TabInformations.GetInstance()[statusId];
                    if (p == null)
                    {
                        try
                        {
                            p = await this.GetStatusApi(read, statusId)
                                .ConfigureAwait(false);
                        }
                        catch (WebApiException ex)
                        {
                            lastException = ex;
                            break;
                        }
                    }

                    if (p != null)
                        relPosts.Add(p.StatusId, p);
                }
            }

            try
            {
                var firstPost = nextPost;
                var posts = await this.GetConversationPosts(firstPost, targetPost)
                    .ConfigureAwait(false);

                foreach (var post in posts.OrderBy(x => x.StatusId))
                {
                    if (relPosts.ContainsKey(post.StatusId))
                        continue;

                    // リプライチェーンが繋がらないツイートは除外
                    if (post.InReplyToStatusId == null || !relPosts.ContainsKey(post.InReplyToStatusId.Value))
                        continue;

                    relPosts.Add(post.StatusId, post);
                }
            }
            catch (WebException ex)
            {
                lastException = ex;
            }

            relPosts.Values.ToList().ForEach(p =>
            {
                var post = p.Clone();
                if (post.IsMe && !read && this.ReadOwnPost)
                    post.IsRead = true;
                else
                    post.IsRead = read;

                tab.AddPostQueue(post);
            });

            if (lastException != null)
                throw new WebApiException(lastException.Message, lastException);
        }

        private async Task<PostClass[]> GetConversationPosts(PostClass firstPost, PostClass targetPost)
        {
            var conversationId = firstPost.StatusId;
            var query = $"conversation_id:{conversationId}";

            if (targetPost.InReplyToUser != null && targetPost.InReplyToUser != targetPost.ScreenName)
                query += $" (from:{targetPost.ScreenName} to:{targetPost.InReplyToUser}) OR (from:{targetPost.InReplyToUser} to:{targetPost.ScreenName})";
            else
                query += $" from:{targetPost.ScreenName} to:{targetPost.ScreenName}";

            var statuses = await this.Api.SearchTweets(query, count: 100)
                .ConfigureAwait(false);

            return statuses.Statuses.Select(x => this.CreatePostsFromStatusData(x)).ToArray();
        }

        public async Task GetSearch(bool read, PublicSearchTabModel tab, bool more)
        {
            var count = GetApiResultCount(MyCommon.WORKERTYPE.PublicSearch, more, false);

            long? maxId = null;
            long? sinceId = null;
            if (more)
            {
                maxId = tab.OldestId - 1;
            }
            else
            {
                sinceId = tab.SinceId;
            }

            var searchResult = await this.Api.SearchTweets(tab.SearchWords, tab.SearchLang, count, maxId, sinceId)
                .ConfigureAwait(false);

            if (!TabInformations.GetInstance().ContainsTab(tab))
                return;

            var minimumId = this.CreatePostsFromSearchJson(searchResult, tab, read, more);

            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        public async Task GetDirectMessageEvents(bool read, bool backward)
        {
            this.CheckAccountState();
            this.CheckAccessLevel(TwitterApiAccessLevel.ReadWriteAndDirectMessage);

            var count = 50;

            TwitterMessageEventList eventList;
            if (backward)
            {
                eventList = await this.Api.DirectMessagesEventsList(count, this.nextCursorDirectMessage)
                    .ConfigureAwait(false);
            }
            else
            {
                eventList = await this.Api.DirectMessagesEventsList(count)
                    .ConfigureAwait(false);
            }

            this.nextCursorDirectMessage = eventList.NextCursor;

            await this.CreateDirectMessagesEventFromJson(eventList, read)
                .ConfigureAwait(false);
        }

        private async Task CreateDirectMessagesEventFromJson(TwitterMessageEventSingle eventSingle, bool read)
        {
            var eventList = new TwitterMessageEventList
            {
                Apps = new Dictionary<string, TwitterMessageEventList.App>(),
                Events = new[] { eventSingle.Event },
            };

            await this.CreateDirectMessagesEventFromJson(eventList, read)
                .ConfigureAwait(false);
        }

        private async Task CreateDirectMessagesEventFromJson(TwitterMessageEventList eventList, bool read)
        {
            var events = eventList.Events
                .Where(x => x.Type == "message_create")
                .ToArray();

            if (events.Length == 0)
                return;

            var userIds = Enumerable.Concat(
                events.Select(x => x.MessageCreate.SenderId),
                events.Select(x => x.MessageCreate.Target.RecipientId)
            ).Distinct().ToArray();

            var users = (await this.Api.UsersLookup(userIds).ConfigureAwait(false))
                .ToDictionary(x => x.IdStr);

            var apps = eventList.Apps ?? new Dictionary<string, TwitterMessageEventList.App>();

            this.CreateDirectMessagesEventFromJson(events, users, apps, read);
        }

        private void CreateDirectMessagesEventFromJson(
            IEnumerable<TwitterMessageEvent> events,
            IReadOnlyDictionary<string, TwitterUser> users,
            IReadOnlyDictionary<string, TwitterMessageEventList.App> apps,
            bool read)
        {
            var dmTab = TabInformations.GetInstance().DirectMessageTab;

            foreach (var eventItem in events)
            {
                var post = this.postFactory.CreateFromDirectMessageEvent(eventItem, users, apps, this.UserId);

                post.IsRead = read;
                if (post.IsMe && !read && this.ReadOwnPost)
                    post.IsRead = true;

                dmTab.AddPostQueue(post);
            }
        }

        public async Task GetFavoritesApi(bool read, FavoritesTabModel tab, bool backward)
        {
            this.CheckAccountState();

            var count = GetApiResultCount(MyCommon.WORKERTYPE.Favorites, backward, false);

            TwitterStatus[] statuses;
            if (backward)
            {
                statuses = await this.Api.FavoritesList(count, maxId: tab.OldestId)
                    .ConfigureAwait(false);
            }
            else
            {
                statuses = await this.Api.FavoritesList(count)
                    .ConfigureAwait(false);
            }

            var minimumId = this.CreateFavoritePostsFromJson(statuses, read);

            if (minimumId != null)
                tab.OldestId = minimumId.Value;
        }

        /// <summary>
        /// フォロワーIDを更新します
        /// </summary>
        /// <exception cref="WebApiException"/>
        public async Task RefreshFollowerIds()
        {
            if (MyCommon.EndingFlag) return;

            var cursor = -1L;
            var newFollowerIds = Enumerable.Empty<long>();
            do
            {
                var ret = await this.Api.FollowersIds(cursor)
                    .ConfigureAwait(false);

                if (ret.Ids == null)
                    throw new WebApiException("ret.ids == null");

                newFollowerIds = newFollowerIds.Concat(ret.Ids);
                cursor = ret.NextCursor;
            }
            while (cursor != 0);

            this.followerId = newFollowerIds.ToHashSet();
            TabInformations.GetInstance().RefreshOwl(this.followerId);

            this.GetFollowersSuccess = true;
        }

        /// <summary>
        /// RT 非表示ユーザーを更新します
        /// </summary>
        /// <exception cref="WebApiException"/>
        public async Task RefreshNoRetweetIds()
        {
            if (MyCommon.EndingFlag) return;

            this.noRTId = await this.Api.NoRetweetIds()
                .ConfigureAwait(false);

            this.GetNoRetweetSuccess = true;
        }

        /// <summary>
        /// t.co の文字列長などの設定情報を更新します
        /// </summary>
        /// <exception cref="WebApiException"/>
        public async Task RefreshConfiguration()
        {
            this.Configuration = await this.Api.Configuration()
                .ConfigureAwait(false);

            // TextConfiguration 相当の JSON を得る API が存在しないため、TransformedURLLength のみ help/configuration.json に合わせて更新する
            this.TextConfiguration.TransformedURLLength = this.Configuration.ShortUrlLengthHttps;
        }

        public async Task GetListsApi()
        {
            this.CheckAccountState();

            var ownedLists = await TwitterLists.GetAllItemsAsync(x =>
                this.Api.ListsOwnerships(this.Username, cursor: x, count: 1000))
                    .ConfigureAwait(false);

            var subscribedLists = await TwitterLists.GetAllItemsAsync(x =>
                this.Api.ListsSubscriptions(this.Username, cursor: x, count: 1000))
                    .ConfigureAwait(false);

            TabInformations.GetInstance().SubscribableLists = Enumerable.Concat(ownedLists, subscribedLists)
                .Select(x => new ListElement(x, this))
                .ToList();
        }

        public async Task DeleteList(long listId)
        {
            await this.Api.ListsDestroy(listId)
                .IgnoreResponse()
                .ConfigureAwait(false);

            var tabinfo = TabInformations.GetInstance();

            tabinfo.SubscribableLists = tabinfo.SubscribableLists
                .Where(x => x.Id != listId)
                .ToList();
        }

        public async Task<ListElement> EditList(long listId, string new_name, bool isPrivate, string description)
        {
            var response = await this.Api.ListsUpdate(listId, new_name, description, isPrivate)
                .ConfigureAwait(false);

            var list = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            return new ListElement(list, this);
        }

        public async Task<long> GetListMembers(long listId, List<UserInfo> lists, long cursor)
        {
            this.CheckAccountState();

            var users = await this.Api.ListsMembers(listId, cursor)
                .ConfigureAwait(false);

            Array.ForEach(users.Users, u => lists.Add(new UserInfo(u)));

            return users.NextCursor;
        }

        public async Task CreateListApi(string listName, bool isPrivate, string description)
        {
            this.CheckAccountState();

            var response = await this.Api.ListsCreate(listName, description, isPrivate)
                .ConfigureAwait(false);

            var list = await response.LoadJsonAsync()
                .ConfigureAwait(false);

            TabInformations.GetInstance().SubscribableLists.Add(new ListElement(list, this));
        }

        public async Task<bool> ContainsUserAtList(long listId, string user)
        {
            this.CheckAccountState();

            try
            {
                await this.Api.ListsMembersShow(listId, user)
                    .ConfigureAwait(false);

                return true;
            }
            catch (TwitterApiException ex)
                when (ex.Errors.Any(x => x.Code == TwitterErrorCode.NotFound))
            {
                return false;
            }
        }

        public async Task<TwitterApiStatus?> GetInfoApi()
        {
            if (Twitter.AccountState != MyCommon.ACCOUNT_STATE.Valid) return null;

            if (MyCommon.EndingFlag) return null;

            var limits = await this.Api.ApplicationRateLimitStatus()
                .ConfigureAwait(false);

            MyCommon.TwitterApiInfo.UpdateFromJson(limits);

            return MyCommon.TwitterApiInfo;
        }

        /// <summary>
        /// ブロック中のユーザーを更新します
        /// </summary>
        /// <exception cref="WebApiException"/>
        public async Task RefreshBlockIds()
        {
            if (MyCommon.EndingFlag) return;

            var cursor = -1L;
            var newBlockIds = Enumerable.Empty<long>();
            do
            {
                var ret = await this.Api.BlocksIds(cursor)
                    .ConfigureAwait(false);

                newBlockIds = newBlockIds.Concat(ret.Ids);
                cursor = ret.NextCursor;
            }
            while (cursor != 0);

            var blockIdsSet = newBlockIds.ToHashSet();
            blockIdsSet.Remove(this.UserId); // 元のソースにあったので一応残しておく

            TabInformations.GetInstance().BlockIds = blockIdsSet;
        }

        /// <summary>
        /// ミュート中のユーザーIDを更新します
        /// </summary>
        /// <exception cref="WebApiException"/>
        public async Task RefreshMuteUserIdsAsync()
        {
            if (MyCommon.EndingFlag) return;

            var ids = await TwitterIds.GetAllItemsAsync(x => this.Api.MutesUsersIds(x))
                .ConfigureAwait(false);

            TabInformations.GetInstance().MuteUserIds = ids.ToHashSet();
        }

        public string[] GetHashList()
            => this.postFactory.GetReceivedHashtags();

        public string AccessToken
            => ((TwitterApiConnection)this.Api.Connection).AccessToken;

        public string AccessTokenSecret
            => ((TwitterApiConnection)this.Api.Connection).AccessSecret;

        private void CheckAccountState()
        {
            if (Twitter.AccountState != MyCommon.ACCOUNT_STATE.Valid)
                throw new WebApiException("Auth error. Check your account");
        }

        private void CheckAccessLevel(TwitterApiAccessLevel accessLevelFlags)
        {
            if (!this.AccessLevel.HasFlag(accessLevelFlags))
                throw new WebApiException("Auth Err:try to re-authorization.");
        }

        public int GetTextLengthRemain(string postText)
        {
            var matchDm = Twitter.DMSendTextRegex.Match(postText);
            if (matchDm.Success)
                return this.GetTextLengthRemainDM(matchDm.Groups["body"].Value);

            return this.GetTextLengthRemainWeighted(postText);
        }

        private int GetTextLengthRemainDM(string postText)
        {
            var textLength = 0;

            var pos = 0;
            while (pos < postText.Length)
            {
                textLength++;

                if (char.IsSurrogatePair(postText, pos))
                    pos += 2; // サロゲートペアの場合は2文字分進める
                else
                    pos++;
            }

            var urls = TweetExtractor.ExtractUrls(postText);
            foreach (var url in urls)
            {
                var shortUrlLength = url.StartsWith("https://", StringComparison.OrdinalIgnoreCase)
                    ? this.Configuration.ShortUrlLengthHttps
                    : this.Configuration.ShortUrlLength;

                textLength += shortUrlLength - url.Length;
            }

            return this.Configuration.DmTextCharacterLimit - textLength;
        }

        private int GetTextLengthRemainWeighted(string postText)
        {
            var config = this.TextConfiguration;
            var totalWeight = 0;

            int GetWeightFromCodepoint(int codepoint)
            {
                foreach (var weightRange in config.Ranges)
                {
                    if (codepoint >= weightRange.Start && codepoint <= weightRange.End)
                        return weightRange.Weight;
                }

                return config.DefaultWeight;
            }

            var urls = TweetExtractor.ExtractUrlEntities(postText).ToArray();
            var emojis = config.EmojiParsingEnabled
                ? TweetExtractor.ExtractEmojiEntities(postText).ToArray()
                : Array.Empty<TwitterEntityEmoji>();

            var codepoints = postText.ToCodepoints().ToArray();
            var index = 0;
            while (index < codepoints.Length)
            {
                var urlEntity = urls.FirstOrDefault(x => x.Indices[0] == index);
                if (urlEntity != null)
                {
                    totalWeight += config.TransformedURLLength * config.Scale;
                    index = urlEntity.Indices[1];
                    continue;
                }

                var emojiEntity = emojis.FirstOrDefault(x => x.Indices[0] == index);
                if (emojiEntity != null)
                {
                    totalWeight += GetWeightFromCodepoint(codepoints[index]);
                    index = emojiEntity.Indices[1];
                    continue;
                }

                var codepoint = codepoints[index];
                totalWeight += GetWeightFromCodepoint(codepoint);

                index++;
            }

            var remainWeight = config.MaxWeightedTweetLength * config.Scale - totalWeight;

            return remainWeight / config.Scale;
        }

        /// <summary>
        /// プロフィール画像のサイズを指定したURLを生成
        /// </summary>
        /// <remarks>
        /// https://developer.twitter.com/en/docs/twitter-api/v1/accounts-and-users/user-profile-images-and-banners を参照
        /// </remarks>
        public static string CreateProfileImageUrl(string normalUrl, string size)
        {
            return size switch
            {
                "original" => normalUrl.Replace("_normal.", "."),
                "normal" => normalUrl,
                "bigger" or "mini" => normalUrl.Replace("_normal.", $"_{size}."),
                _ => throw new ArgumentException($"Invalid size: ${size}", nameof(size)),
            };
        }

        public static string DecideProfileImageSize(int sizePx)
        {
            return sizePx switch
            {
                <= 24 => "mini",
                <= 48 => "normal",
                <= 73 => "bigger",
                _ => "original",
            };
        }

        public bool IsDisposed { get; private set; } = false;

        protected virtual void Dispose(bool disposing)
        {
            if (this.IsDisposed)
                return;

            if (disposing)
            {
                this.Api.Dispose();
            }

            this.IsDisposed = true;
        }

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }
    }
}
