refactor: extract remaining Telegram handlers to platform-neutral contracts

- Extract CreateSessionHandler, ListSessionsHandler, DeleteSessionHandler, ExportCalendarHandler, HandleRescheduleTimeInputHandler, HandleRescheduleVoteHandler to GmRelay.Shared - Add IPlatformMessenger methods: SendScheduleAsync, UpdateScheduleAsync, SendGroupMessageAsync with actions, CreateThreadAsync, DeleteThreadAsync - Rewrite Telegram Bot wrappers as thin adapters delegating to shared handlers - Rewrite DiscordRescheduleVoteHandler to use shared HandleRescheduleVoteHandler - Update UpdateRouter with explicit type aliases for ambiguous handler names - Add contract and source-inspection tests for extracted handlers - Bump version 3.1.1 → 3.2.0 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-27 14:52:09 +03:00
parent 383e2c1d8d
commit 542f15f2d6
45 changed files with 1648 additions and 1030 deletions
@@ -0,0 +1,12 @@
+using GmRelay.Shared.Platform;
+
+namespace GmRelay.Shared.Features.Sessions.CreateSession;
+
+public sealed record CreateSessionCommand(
+    PlatformUser User,
+    PlatformGroup Group,
+    string Title,
+    string Link,
+    IReadOnlyList<DateTimeOffset> ScheduledTimes,
+    int? MaxPlayers,
+    string? ImageReference);
@@ -0,0 +1,157 @@
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using GmRelay.Shared.Rendering;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.CreateSession;
+
+internal sealed record SessionCreationGroupAccessDto(Guid GroupId, bool CanManage);
+
+public sealed class CreateSessionHandler(
+    NpgsqlDataSource dataSource)
+{
+    public async Task<CreateSessionResult> HandleAsync(CreateSessionCommand command, CancellationToken ct)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+        await using var transaction = await connection.BeginTransactionAsync(ct);
+
+        try
+        {
+            var platform = command.User.Platform.ToString();
+            var externalUserId = command.User.ExternalUserId;
+            var displayName = command.User.DisplayName;
+            var externalUsername = command.User.ExternalUsername;
+
+            await connection.ExecuteAsync(
+                """
+                INSERT INTO players (display_name, platform, external_user_id, external_username)
+                VALUES (@Name, @Platform, @ExternalId, @Username)
+                ON CONFLICT (platform, external_user_id)
+                WHERE platform IS NOT NULL AND external_user_id IS NOT NULL
+                DO UPDATE
+                SET display_name = EXCLUDED.display_name,
+                    external_username = EXCLUDED.external_username;
+                """,
+                new { ExternalId = externalUserId, Name = displayName, Username = externalUsername },
+                transaction);
+
+            var existingGroup = await connection.QuerySingleOrDefaultAsync<SessionCreationGroupAccessDto>(
+                """
+                SELECT g.id AS GroupId,
+                       EXISTS (
+                           SELECT 1
+                           FROM group_managers gm
+                           JOIN players p ON p.id = gm.player_id
+                           WHERE gm.group_id = g.id
+                             AND p.platform = @Platform
+                             AND p.external_user_id = @ExternalGmId
+                       ) AS CanManage
+                FROM game_groups g
+                WHERE g.platform = @Platform
+                  AND g.external_group_id = @ExternalGroupId
+                """,
+                new { Platform = platform, ExternalGroupId = command.Group.ExternalGroupId, ExternalGmId = externalUserId },
+                transaction);
+
+            Guid groupId;
+            if (existingGroup is null)
+            {
+                groupId = await connection.ExecuteScalarAsync<Guid>(
+                    """
+                    INSERT INTO game_groups (name, platform, external_group_id, external_channel_id)
+                    VALUES (@ChatName, @Platform, @ExternalGroupId, @ExternalChannelId)
+                    RETURNING id;
+                    """,
+                    new
+                    {
+                        Platform = platform,
+                        ExternalGroupId = command.Group.ExternalGroupId,
+                        ExternalChannelId = command.Group.ExternalChannelId,
+                        ChatName = command.Group.DisplayName
+                    },
+                    transaction);
+
+                await connection.ExecuteAsync(
+                    """
+                    INSERT INTO group_managers (group_id, player_id, role)
+                    SELECT @GroupId, p.id, @OwnerRole
+                    FROM players p
+                    WHERE p.platform = @Platform
+                      AND p.external_user_id = @ExternalGmId
+                    ON CONFLICT (group_id, player_id) DO NOTHING
+                    """,
+                    new { GroupId = groupId, ExternalGmId = externalUserId, OwnerRole = GroupManagerRoleExtensions.OwnerValue },
+                    transaction);
+            }
+            else
+            {
+                if (!existingGroup.CanManage)
+                {
+                    await transaction.RollbackAsync(ct);
+                    return new CreateSessionResult(
+                        false,
+                        "⛔ Только owner или co-GM этой группы может создавать игровые сессии.",
+                        null,
+                        null,
+                        null,
+                        Array.Empty<string>());
+                }
+
+                groupId = existingGroup.GroupId;
+                await connection.ExecuteAsync(
+                    """
+                    UPDATE game_groups
+                    SET name = @ChatName
+                    WHERE id = @GroupId
+                    """,
+                    new { ChatName = command.Group.DisplayName, GroupId = groupId },
+                    transaction);
+            }
+
+            var batchId = Guid.NewGuid();
+            var sessions = new List<SessionBatchDto>();
+            var orderedTimes = command.ScheduledTimes.OrderBy(v => v).ToList();
+
+            foreach (var scheduledAt in orderedTimes)
+            {
+                var sessionId = await connection.ExecuteScalarAsync<Guid>(
+                    """
+                    INSERT INTO sessions (batch_id, group_id, title, join_link, scheduled_at, status, max_players)
+                    VALUES (@BatchId, @GroupId, @Title, @Link, @ScheduledAt, @Status, @MaxPlayers)
+                    RETURNING id;
+                    """,
+                    new
+                    {
+                        BatchId = batchId,
+                        GroupId = groupId,
+                        command.Title,
+                        Link = command.Link,
+                        ScheduledAt = scheduledAt,
+                        Status = SessionStatus.Planned,
+                        MaxPlayers = command.MaxPlayers
+                    },
+                    transaction);
+
+                sessions.Add(new SessionBatchDto(sessionId, scheduledAt.UtcDateTime, SessionStatus.Planned, command.MaxPlayers, command.Link));
+            }
+
+            await transaction.CommitAsync(ct);
+
+            var view = SessionBatchViewBuilder.Build(command.Title, sessions, Array.Empty<ParticipantBatchDto>());
+
+            return new CreateSessionResult(
+                true,
+                null,
+                view,
+                batchId,
+                groupId,
+                Array.Empty<string>());
+        }
+        catch
+        {
+            await transaction.RollbackAsync(ct);
+            throw;
+        }
+    }
+}
@@ -0,0 +1,11 @@
+using GmRelay.Shared.Rendering;
+
+namespace GmRelay.Shared.Features.Sessions.CreateSession;
+
+public sealed record CreateSessionResult(
+    bool Success,
+    string? ErrorMessage,
+    SessionBatchViewModel? View,
+    Guid? BatchId,
+    Guid? GroupId,
+    IReadOnlyList<string> Warnings);
@@ -0,0 +1,7 @@
+using GmRelay.Shared.Platform;
+
+namespace GmRelay.Shared.Features.Sessions.ExportCalendar;
+
+public sealed record ExportCalendarCommand(
+    PlatformGroup Group,
+    PlatformUser User);
@@ -0,0 +1,111 @@
+using System.Text;
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using Microsoft.Extensions.Configuration;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.ExportCalendar;
+
+internal sealed record CalendarSessionDto(Guid Id, string Title, DateTime ScheduledAt);
+
+public sealed class ExportCalendarHandler(
+    NpgsqlDataSource dataSource,
+    IPlatformMessenger messenger,
+    IConfiguration configuration)
+{
+    public async Task HandleAsync(ExportCalendarCommand command, CancellationToken cancellationToken)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(cancellationToken);
+
+        var sessions = await connection.QueryAsync<CalendarSessionDto>(
+            @"SELECT s.id as Id, s.title as Title, s.scheduled_at as ScheduledAt"
+            + " FROM sessions s"
+            + " JOIN game_groups g ON s.group_id = g.id"
+            + " WHERE g.platform = @Platform"
+            + " AND g.external_group_id = @ExternalGroupId"
+            + " AND s.status = @Planned"
+            + " AND s.scheduled_at > NOW()"
+            + " ORDER BY s.scheduled_at ASC",
+            new { Platform = command.Group.Platform.ToString(), ExternalGroupId = command.Group.ExternalGroupId, Planned = SessionStatus.Planned });
+
+        var sessionsList = sessions.ToList();
+
+        if (sessionsList.Count == 0)
+        {
+            await messenger.SendGroupMessageAsync(
+                command.Group,
+                "📭 У этой группы нет запланированных сессий для экспорта.",
+                cancellationToken);
+            return;
+        }
+
+        var sb = new StringBuilder();
+        sb.AppendLine("BEGIN:VCALENDAR");
+        sb.AppendLine("VERSION:2.0");
+        sb.AppendLine("PRODID:-//GM-Relay//TTRPG Schedule//EN");
+
+        foreach (var s in sessionsList)
+        {
+            var dtStart = s.ScheduledAt.ToString("yyyyMMddTHHmmssZ");
+            var dtEnd = s.ScheduledAt.AddHours(4).ToString("yyyyMMddTHHmmssZ");
+
+            sb.AppendLine("BEGIN:VEVENT");
+            sb.AppendLine($"UID:{s.Id}@gmrelay");
+            sb.AppendLine($"DTSTAMP:{DateTime.UtcNow:yyyyMMddTHHmmssZ}");
+            sb.AppendLine($"DTSTART:{dtStart}");
+            sb.AppendLine($"DTEND:{dtEnd}");
+            sb.AppendLine($"SUMMARY:{s.Title}");
+            sb.AppendLine("END:VEVENT");
+        }
+
+        sb.AppendLine("END:VCALENDAR");
+
+        var bytes = Encoding.UTF8.GetBytes(sb.ToString());
+
+        // Create calendar subscription
+        string? subscriptionUrl = null;
+        var baseUrl = configuration["Web:BaseUrl"];
+        var senderId = command.User.ExternalUserId;
+        if (!string.IsNullOrWhiteSpace(baseUrl) && !string.IsNullOrWhiteSpace(senderId))
+        {
+            try
+            {
+                var token = Guid.NewGuid().ToString("N");
+                var groupId = await connection.QueryFirstOrDefaultAsync<Guid?>(
+                    @"SELECT id FROM game_groups WHERE platform = @Platform AND external_group_id = @ExternalGroupId",
+                    new { Platform = command.Group.Platform.ToString(), ExternalGroupId = command.Group.ExternalGroupId });
+
+                await connection.ExecuteAsync(
+                    @"INSERT INTO calendar_subscriptions (id, token, user_platform, user_external_id, group_id, filter_type, created_at, expires_at)
+                      VALUES (gen_random_uuid(), @token, @userPlatform, @userExternalId, @groupId, @filterType, now(), NULL)",
+                    new { token, userPlatform = command.Group.Platform.ToString(), userExternalId = senderId, groupId, filterType = (int)CalendarSubscriptionFilter.SpecificGroup });
+
+                subscriptionUrl = $"{baseUrl.TrimEnd('/')}/calendar/{token}.ics";
+            }
+            catch
+            {
+                // Non-critical: if subscription creation fails, still send the file
+            }
+        }
+
+        var actions = subscriptionUrl is not null
+            ? new[]
+            {
+                new PlatformMessageAction(
+                    "calendar-subscription",
+                    "🔗 Подписаться на календарь",
+                    subscriptionUrl)
+            }
+            : Array.Empty<PlatformMessageAction>();
+
+        await messenger.SendCalendarFileAsync(
+            new PlatformCalendarFile(
+                command.Group,
+                "schedule.ics",
+                bytes,
+                "📅 <b>Ваш календарь игр!</b>\nОткройте файл на устройстве, чтобы добавить события в свой календарь.",
+                actions),
+            cancellationToken);
+    }
+}
@@ -0,0 +1,91 @@
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using Microsoft.Extensions.Logging;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.ListSessions;
+
+internal sealed record DeleteSessionInfoDto(
+    string Title,
+    Guid BatchId,
+    Guid GroupId,
+    bool CanManage,
+    int? ThreadId,
+    bool TopicCreatedByBot);
+
+public sealed record DeleteSessionResult(
+    bool Success,
+    string? ReplyText,
+    string? Title,
+    Guid? GroupId,
+    int? ThreadId,
+    bool TopicCreatedByBot,
+    int RemainingInTopic);
+
+public sealed class DeleteSessionHandler(
+    NpgsqlDataSource dataSource)
+{
+    public async Task<DeleteSessionResult> HandleAsync(DeleteSessionCommand command, CancellationToken ct)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+        await using var transaction = await connection.BeginTransactionAsync(ct);
+
+        // 1. Fetch session and verify group manager.
+        var session = await connection.QuerySingleOrDefaultAsync<DeleteSessionInfoDto>(
+            """
+            SELECT s.title AS Title,
+                   s.batch_id AS BatchId,
+                   s.group_id AS GroupId,
+                   s.thread_id AS ThreadId,
+                   s.topic_created_by_bot AS TopicCreatedByBot,
+                   EXISTS (
+                       SELECT 1
+                       FROM group_managers gm
+                       JOIN players p ON p.id = gm.player_id
+                       WHERE gm.group_id = s.group_id
+                         AND p.platform = @Platform
+                       AND p.external_user_id = @ExternalUserId
+                   ) AS CanManage
+            FROM sessions s
+            WHERE s.id = @SessionId
+            """,
+            new { command.SessionId, Platform = command.User.Platform.ToString(), ExternalUserId = command.User.ExternalUserId }, transaction);
+
+        if (session == null)
+        {
+            return new DeleteSessionResult(false, "Сессия не найдена.", null, null, null, false, 0);
+        }
+
+        if (!session.CanManage)
+        {
+            return new DeleteSessionResult(false, "Только owner или co-GM может удалять сессию.", null, null, null, false, 0);
+        }
+
+        // 2. Delete session
+        await connection.ExecuteAsync("DELETE FROM sessions WHERE id = @Id", new { Id = command.SessionId }, transaction);
+
+        var remainingInTopic = session.ThreadId.HasValue
+            ? await connection.ExecuteScalarAsync<int>(
+                """
+                SELECT COUNT(*)
+                FROM sessions
+                WHERE group_id = @GroupId
+                  AND thread_id = @ThreadId
+                """,
+                new { session.GroupId, ThreadId = session.ThreadId.Value },
+                transaction)
+            : 0;
+
+        await transaction.CommitAsync(ct);
+
+        return new DeleteSessionResult(
+            true,
+            "Сессия удалена!",
+            session.Title,
+            session.GroupId,
+            session.ThreadId,
+            session.TopicCreatedByBot,
+            remainingInTopic);
+    }
+}
@@ -0,0 +1,13 @@
+using GmRelay.Shared.Platform;
+
+namespace GmRelay.Shared.Features.Sessions.ListSessions;
+
+public sealed record ListSessionsCommand(
+    PlatformGroup Group,
+    PlatformUser User);
+
+public sealed record DeleteSessionCommand(
+    Guid SessionId,
+    PlatformUser User,
+    PlatformGroup Group,
+    PlatformMessageRef ScheduleMessage);
@@ -0,0 +1,57 @@
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.ListSessions;
+
+public sealed record SessionListItemDto(Guid Id, string Title, DateTime ScheduledAt, string Status, int? MaxPlayers, int PlayerCount, int WaitlistCount, bool CanManage);
+
+public sealed record SessionListResult(
+    IReadOnlyList<SessionListItemDto> Sessions,
+    bool CanManage);
+
+public sealed class ListSessionsHandler(
+    NpgsqlDataSource dataSource)
+{
+    public async Task<SessionListResult> HandleAsync(ListSessionsCommand command, CancellationToken cancellationToken)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(cancellationToken);
+
+        var sessions = await connection.QueryAsync<SessionListItemDto>(
+            @"SELECT s.id as Id, s.title as Title, s.scheduled_at as ScheduledAt, s.status as Status, s.max_players as MaxPlayers,
+                     COUNT(sp.id) FILTER (WHERE sp.is_gm = false AND sp.registration_status = @Active) as PlayerCount,
+                     COUNT(sp.id) FILTER (WHERE sp.is_gm = false AND sp.registration_status = @Waitlisted) as WaitlistCount,
+                     EXISTS (
+                         SELECT 1
+                         FROM group_managers gm
+                         JOIN players manager_player ON manager_player.id = gm.player_id
+                         WHERE gm.group_id = s.group_id
+                           AND manager_player.platform = @Platform
+                           AND manager_player.external_user_id = @ExternalUserId
+                     ) AS CanManage
+              FROM sessions s
+              JOIN game_groups g ON s.group_id = g.id
+              LEFT JOIN session_participants sp ON s.id = sp.session_id
+              WHERE g.platform = @Platform
+                AND g.external_group_id = @ExternalGroupId
+                AND s.status != @Cancelled
+                AND s.scheduled_at > NOW()
+              GROUP BY s.id, s.title, s.scheduled_at, s.status, s.max_players, s.group_id
+              ORDER BY s.scheduled_at ASC",
+            new
+            {
+                Platform = command.Group.Platform.ToString(),
+                ExternalGroupId = command.Group.ExternalGroupId,
+                ExternalUserId = command.User.ExternalUserId,
+                Cancelled = SessionStatus.Cancelled,
+                Active = ParticipantRegistrationStatus.Active,
+                Waitlisted = ParticipantRegistrationStatus.Waitlisted
+            });
+
+        var sessionsList = sessions.ToList();
+        var canManage = sessionsList.Count > 0 && sessionsList.First().CanManage;
+
+        return new SessionListResult(sessionsList, canManage);
+    }
+}
@@ -0,0 +1,12 @@
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+internal sealed record AwaitingProposalDto(
+    Guid Id,
+    Guid SessionId,
+    string Title,
+    DateTime CurrentScheduledAt,
+    Guid BatchId,
+    int? BatchMessageId,
+    string ExternalGroupId,
+    int? ThreadId,
+    string NotificationMode);
@@ -0,0 +1,15 @@
+using GmRelay.Shared.Platform;
+
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+public sealed record HandleRescheduleTimeInputCommand(
+    PlatformUser User,
+    PlatformGroup Group,
+    string Text);
+
+public sealed record HandleRescheduleVoteCommand(
+    Guid OptionId,
+    PlatformUser User,
+    PlatformGroup Group,
+    string InteractionId,
+    PlatformMessageRef ScheduleMessage);
@@ -0,0 +1,181 @@
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using GmRelay.Shared.Rendering;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+public sealed class HandleRescheduleTimeInputHandler(
+    NpgsqlDataSource dataSource)
+{
+    public async Task<HandleRescheduleTimeInputResult> HandleAsync(
+        HandleRescheduleTimeInputCommand command, CancellationToken ct)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+
+        var platform = command.User.Platform.ToString();
+        var externalGmId = command.User.ExternalUserId;
+        var externalGroupId = command.Group.ExternalGroupId;
+
+        var proposal = await connection.QuerySingleOrDefaultAsync<AwaitingProposalDto>(
+            """
+            SELECT rp.id AS Id, rp.session_id AS SessionId, s.title AS Title, s.scheduled_at AS CurrentScheduledAt,
+                   s.batch_id AS BatchId, s.batch_message_id AS BatchMessageId,
+                   g.external_group_id AS ExternalGroupId,
+                   s.thread_id AS ThreadId,
+                   s.notification_mode AS NotificationMode
+            FROM reschedule_proposals rp
+            JOIN sessions s ON s.id = rp.session_id
+            JOIN game_groups g ON g.id = s.group_id
+            WHERE rp.proposed_by_external_user_id = @ExternalGmId
+              AND rp.status = 'AwaitingTime'
+              AND g.platform = @Platform
+              AND g.external_group_id = @ExternalGroupId
+              AND EXISTS (
+                  SELECT 1
+                  FROM group_managers gm
+                  JOIN players manager_player ON manager_player.id = gm.player_id
+                  WHERE gm.group_id = s.group_id
+                    AND manager_player.platform = @Platform
+                    AND manager_player.external_user_id = @ExternalGmId
+              )
+            ORDER BY rp.created_at DESC
+            LIMIT 1
+            """,
+            new { ExternalGmId = externalGmId, Platform = platform, ExternalGroupId = externalGroupId });
+
+        if (proposal is null)
+            return new HandleRescheduleTimeInputResult(false, false, null, null, null, null, [], [], [], null, default, null);
+
+        if (!RescheduleVotingInput.TryParse(command.Text, DateTimeOffset.UtcNow, out var votingInput, out var parseError))
+        {
+            return new HandleRescheduleTimeInputResult(
+                true, false, parseError, null, null, null, [], [], [], proposal.Title, proposal.CurrentScheduledAt, null);
+        }
+
+        var participants = (await connection.QueryAsync<VoteParticipantDto>(
+            """
+            SELECT p.id AS PlayerId,
+                   p.display_name AS DisplayName,
+                   p.external_username AS TelegramUsername,
+                   p.external_user_id::BIGINT AS TelegramId
+            FROM session_participants sp
+            JOIN players p ON p.id = sp.player_id
+            WHERE sp.session_id = @SessionId
+              AND sp.is_gm = false
+              AND sp.registration_status = @Active
+            """,
+            new { proposal.SessionId, Active = ParticipantRegistrationStatus.Active })).ToList();
+
+        if (participants.Count == 0)
+        {
+            var newTime = votingInput.Options[0];
+            var view = await RescheduleImmediatelyAsync(connection, proposal, newTime, ct);
+            var replyText =
+                $"""✅ Сессия «{proposal.Title}» перенесена!\n\n📅 Новое время: <b>{newTime.ToOffset(TimeSpan.FromHours(3)).ToString("d MMMM yyyy, HH:mm", System.Globalization.CultureInfo.GetCultureInfo("ru-RU"))}</b> (МСК)\n\n<i>Участников нет — голосование не требуется.</i>""";
+            return new HandleRescheduleTimeInputResult(
+                true, true, replyText, view, null, null, [], [], [], proposal.Title, proposal.CurrentScheduledAt, proposal.BatchMessageId);
+        }
+
+        await using var transaction = await connection.BeginTransactionAsync(ct);
+        var options = votingInput.Options
+            .Select((proposedAt, index) => new RescheduleOptionDto(
+                Guid.NewGuid(),
+                index + 1,
+                proposedAt))
+            .ToList();
+
+        await connection.ExecuteAsync(
+            """
+            UPDATE reschedule_proposals
+            SET voting_deadline_at = @Deadline, status = 'Voting', vote_chat_id = @VoteChatId
+            WHERE id = @Id
+            """,
+            new { votingInput.Deadline, VoteChatId = externalGroupId, Id = proposal.Id },
+            transaction);
+
+        foreach (var option in options)
+        {
+            await connection.ExecuteAsync(
+                """
+                INSERT INTO reschedule_options (id, proposal_id, proposed_at, display_order)
+                VALUES (@OptionId, @ProposalId, @ProposedAt, @DisplayOrder)
+                """,
+                new
+                {
+                    option.OptionId,
+                    ProposalId = proposal.Id,
+                    option.ProposedAt,
+                    option.DisplayOrder
+                },
+                transaction);
+        }
+
+        await transaction.CommitAsync(ct);
+
+        return new HandleRescheduleTimeInputResult(
+            true,
+            false,
+            null,
+            null,
+            proposal.Id,
+            votingInput.Deadline,
+            options,
+            participants,
+            [],
+            proposal.Title,
+            proposal.CurrentScheduledAt,
+            null);
+    }
+
+    private static async Task<SessionBatchViewModel?> RescheduleImmediatelyAsync(
+        NpgsqlConnection connection,
+        AwaitingProposalDto proposal,
+        DateTimeOffset newTime,
+        CancellationToken ct)
+    {
+        await using var transaction = await connection.BeginTransactionAsync(ct);
+
+        await connection.ExecuteAsync(
+            """
+            UPDATE sessions
+            SET scheduled_at = @NewTime,
+                status = @Status,
+                confirmation_message_id = NULL,
+                confirmation_sent_at = NULL,
+                one_hour_reminder_processed_at = NULL,
+                updated_at = now()
+            WHERE id = @SessionId
+            """,
+            new { NewTime = newTime, proposal.SessionId, Status = SessionStatus.Planned },
+            transaction);
+
+        await connection.ExecuteAsync(
+            "UPDATE reschedule_proposals SET proposed_at = @NewTime, status = 'Approved' WHERE id = @Id",
+            new { NewTime = newTime, Id = proposal.Id },
+            transaction);
+
+        await transaction.CommitAsync(ct);
+
+        var batchSessions = (await connection.QueryAsync<SessionBatchDto>(
+            "SELECT id AS SessionId, scheduled_at AS ScheduledAt, status AS Status, max_players AS MaxPlayers, join_link AS JoinLink FROM sessions WHERE batch_id = @BatchId ORDER BY scheduled_at",
+            new { proposal.BatchId })).ToList();
+
+        var batchParticipants = (await connection.QueryAsync<ParticipantBatchDto>(
+            """
+            SELECT sp.session_id AS SessionId,
+                   p.display_name AS DisplayName,
+                   p.external_username AS TelegramUsername,
+                   sp.registration_status AS RegistrationStatus
+            FROM session_participants sp
+            JOIN players p ON sp.player_id = p.id
+            JOIN sessions s ON sp.session_id = s.id
+            WHERE s.batch_id = @BatchId AND sp.is_gm = false
+            ORDER BY sp.registration_status ASC, sp.created_at ASC, sp.responded_at ASC, p.created_at ASC
+            """,
+            new { proposal.BatchId })).ToList();
+
+        return SessionBatchViewBuilder.Build(proposal.Title, batchSessions, batchParticipants);
+    }
+}
@@ -0,0 +1,17 @@
+using GmRelay.Shared.Rendering;
+
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+public sealed record HandleRescheduleTimeInputResult(
+    bool Handled,
+    bool IsRescheduledImmediately,
+    string? ReplyText,
+    SessionBatchViewModel? UpdatedView,
+    Guid? ProposalId,
+    DateTimeOffset? VotingDeadlineAt,
+    IReadOnlyList<RescheduleOptionDto> Options,
+    IReadOnlyList<VoteParticipantDto> Participants,
+    IReadOnlyList<RescheduleOptionVoteDto> Votes,
+    string? Title,
+    DateTime CurrentScheduledAt,
+    int? BatchMessageId);
@@ -0,0 +1,156 @@
+using Dapper;
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Platform;
+using Npgsql;
+
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+public sealed class HandleRescheduleVoteHandler(
+    NpgsqlDataSource dataSource)
+{
+    public async Task<HandleRescheduleVoteResult> HandleAsync(HandleRescheduleVoteCommand command, CancellationToken ct)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+        await using var transaction = await connection.BeginTransactionAsync(ct);
+
+        var proposal = await connection.QuerySingleOrDefaultAsync<VoteProposalDto>(
+            """
+            SELECT rp.id AS Id,
+                   rp.session_id AS SessionId,
+                   rp.voting_deadline_at AS VotingDeadlineAt,
+                   s.title AS Title,
+                   s.scheduled_at AS CurrentScheduledAt
+            FROM reschedule_options ro
+            JOIN reschedule_proposals rp ON rp.id = ro.proposal_id
+            JOIN sessions s ON s.id = rp.session_id
+            WHERE ro.id = @OptionId AND rp.status = 'Voting'
+            """,
+            new { command.OptionId },
+            transaction);
+
+        if (proposal is null)
+        {
+            return new HandleRescheduleVoteResult(
+                false,
+                "Голосование уже завершено или не найдено.",
+                null, null, null, default, default,
+                Array.Empty<VoteParticipantDto>(),
+                Array.Empty<RescheduleOptionDto>(),
+                Array.Empty<RescheduleOptionVoteDto>());
+        }
+
+        if (proposal.VotingDeadlineAt <= DateTimeOffset.UtcNow)
+        {
+            return new HandleRescheduleVoteResult(
+                false,
+                "Дедлайн уже прошёл. Результаты скоро будут применены.",
+                null, null, null, default, default,
+                Array.Empty<VoteParticipantDto>(),
+                Array.Empty<RescheduleOptionDto>(),
+                Array.Empty<RescheduleOptionVoteDto>());
+        }
+
+        var playerId = await connection.ExecuteScalarAsync<Guid?>(
+            """
+            SELECT p.id
+            FROM session_participants sp
+            JOIN players p ON p.id = sp.player_id
+            WHERE sp.session_id = @SessionId
+              AND p.platform = @Platform
+              AND p.external_user_id = @ExternalUserId
+              AND sp.is_gm = false
+              AND sp.registration_status = @Active
+            """,
+            new
+            {
+                proposal.SessionId,
+                Platform = command.User.Platform.ToString(),
+                ExternalUserId = command.User.ExternalUserId,
+                Active = ParticipantRegistrationStatus.Active
+            },
+            transaction);
+
+        if (playerId is null)
+        {
+            return new HandleRescheduleVoteResult(
+                false,
+                "Вы не являетесь участником этой сессии.",
+                null, null, null, default, default,
+                Array.Empty<VoteParticipantDto>(),
+                Array.Empty<RescheduleOptionDto>(),
+                Array.Empty<RescheduleOptionVoteDto>());
+        }
+
+        await connection.ExecuteAsync(
+            """
+            INSERT INTO reschedule_option_votes (proposal_id, player_id, option_id)
+            VALUES (@ProposalId, @PlayerId, @OptionId)
+            ON CONFLICT (proposal_id, player_id) DO UPDATE
+            SET option_id = EXCLUDED.option_id,
+                voted_at = now()
+            """,
+            new
+            {
+                ProposalId = proposal.Id,
+                PlayerId = playerId.Value,
+                command.OptionId
+            },
+            transaction);
+
+        var participants = (await connection.QueryAsync<VoteParticipantDto>(
+            """
+            SELECT p.id AS PlayerId,
+                   p.display_name AS DisplayName,
+                   p.external_username AS TelegramUsername,
+                   p.external_user_id AS TelegramId
+            FROM session_participants sp
+            JOIN players p ON p.id = sp.player_id
+            WHERE sp.session_id = @SessionId
+              AND sp.is_gm = false
+              AND sp.registration_status = @Active
+            ORDER BY p.display_name
+            """,
+            new { proposal.SessionId, Active = ParticipantRegistrationStatus.Active },
+            transaction)).ToList();
+
+        var options = (await connection.QueryAsync<RescheduleOptionDto>(
+            """
+            SELECT id AS OptionId,
+                   display_order AS DisplayOrder,
+                   proposed_at AS ProposedAt
+            FROM reschedule_options
+            WHERE proposal_id = @ProposalId
+            ORDER BY display_order
+            """,
+            new { ProposalId = proposal.Id },
+            transaction)).ToList();
+
+        var votes = (await connection.QueryAsync<RescheduleOptionVoteDto>(
+            """
+            SELECT rov.option_id AS OptionId,
+                   p.id AS PlayerId,
+                   p.display_name AS DisplayName,
+                   p.external_username AS TelegramUsername
+            FROM reschedule_option_votes rov
+            JOIN players p ON p.id = rov.player_id
+            WHERE rov.proposal_id = @ProposalId
+            ORDER BY rov.voted_at, p.display_name
+            """,
+            new { ProposalId = proposal.Id },
+            transaction)).ToList();
+
+        await transaction.CommitAsync(ct);
+
+        return new HandleRescheduleVoteResult(
+            true,
+            "Ваш голос учтён. До дедлайна его можно изменить.",
+            proposal.Id,
+            proposal.SessionId,
+            proposal.Title,
+            proposal.CurrentScheduledAt,
+            proposal.VotingDeadlineAt,
+            participants,
+            options,
+            votes);
+    }
+}
@@ -0,0 +1,15 @@
+using GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+namespace GmRelay.Shared.Features.Sessions.RescheduleSession;
+
+public sealed record HandleRescheduleVoteResult(
+    bool Success,
+    string? ReplyText,
+    Guid? ProposalId,
+    Guid? SessionId,
+    string? Title,
+    DateTime CurrentScheduledAt,
+    DateTimeOffset VotingDeadlineAt,
+    IReadOnlyList<VoteParticipantDto> Participants,
+    IReadOnlyList<RescheduleOptionDto> Options,
+    IReadOnlyList<RescheduleOptionVoteDto> Votes);
@@ -2,7 +2,23 @@ namespace GmRelay.Shared.Platform;

 public interface IPlatformMessenger
 {
-    Task<PlatformMessageRef> SendScheduleAsync(PlatformScheduleMessage message, CancellationToken ct);
+    Task SendGroupMessageAsync(PlatformGroup group, string htmlText, IReadOnlyList<PlatformMessageAction> actions, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support messages with actions.");
+
+    Task UpdateGroupMessageAsync(PlatformMessageRef messageRef, string htmlText, IReadOnlyList<PlatformMessageAction> actions, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support message updates with actions.");
+
+    Task<PlatformMessageRef> CreateThreadAsync(PlatformGroup group, string title, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support thread creation.");
+
+    Task DeleteThreadAsync(PlatformGroup group, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support thread deletion.");
+
+    Task DeleteMessageAsync(PlatformMessageRef messageRef, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support message deletion.");
+
+    Task<PlatformMessageRef> SendScheduleAsync(PlatformScheduleMessage message, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support schedule messages.");

    Task UpdateScheduleAsync(PlatformScheduleMessage message, CancellationToken ct);