feat(platform): route scheduler notifications through platform messenger

src/GmRelay.Shared/Platform/IPlatformMessenger.cs

@@ -13,4 +13,22 @@ public interface IPlatformMessenger
     Task AnswerInteractionAsync(PlatformInteractionReply reply, CancellationToken ct);
 
     Task SendCalendarFileAsync(PlatformCalendarFile file, CancellationToken ct);
+
+    Task<PlatformMessageRef> SendConfirmationRequestAsync(PlatformConfirmationRequest request, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support confirmation requests.");
+
+    Task UpdateConfirmationRequestAsync(PlatformRsvpMessageUpdate update, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support confirmation request updates.");
+
+    Task<PlatformMessageRef> SendJoinLinkNotificationAsync(PlatformJoinLinkNotification notification, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support join-link notifications.");
+
+    Task SendDirectSessionNotificationAsync(PlatformDirectSessionNotification notification, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support direct session notifications.");
+
+    Task SendRsvpOutcomeAsync(PlatformRsvpOutcomeNotification notification, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support RSVP outcome notifications.");
+
+    Task UpdateRescheduleVoteAsync(PlatformRescheduleVoteUpdate update, CancellationToken ct) =>
+        throw new NotSupportedException("This platform messenger does not support reschedule vote updates.");
 }

src/GmRelay.Shared/Platform/PlatformMessageContracts.cs

@@ -1,3 +1,4 @@
+using GmRelay.Shared.Features.Sessions.RescheduleSession;
 using GmRelay.Shared.Rendering;
 
 namespace GmRelay.Shared.Platform;
@@ -34,3 +35,81 @@ public sealed record PlatformCalendarFile(
     byte[] Content,
     string CaptionHtml,
     IReadOnlyList<PlatformMessageAction> Actions);
+
+public sealed record PlatformSessionParticipant(
+    PlatformUser User,
+    string RsvpStatus,
+    string RegistrationStatus,
+    bool IsGm = false);
+
+public sealed record PlatformConfirmationRequest(
+    PlatformGroup Group,
+    Guid SessionId,
+    string Title,
+    DateTime ScheduledAt,
+    IReadOnlyList<PlatformSessionParticipant> Participants,
+    PlatformMessageRef? ExistingMessage = null);
+
+public sealed record PlatformJoinLinkNotification(
+    PlatformGroup Group,
+    Guid SessionId,
+    string Title,
+    DateTime ScheduledAt,
+    string JoinLink,
+    IReadOnlyList<PlatformSessionParticipant> ConfirmedPlayers,
+    PlatformMessageRef? ExistingMessage = null);
+
+public enum PlatformDirectSessionNotificationKind
+{
+    ConfirmationRequest = 0,
+    OneHourReminder = 1,
+    JoinLink = 2,
+    RsvpAllConfirmed = 3,
+    RsvpDeclined = 4,
+    RescheduleApproved = 5,
+    RescheduleRejected = 6
+}
+
+public sealed record PlatformDirectSessionNotification(
+    PlatformDirectSessionNotificationKind Kind,
+    PlatformUser Recipient,
+    Guid SessionId,
+    string Title,
+    DateTime ScheduledAt,
+    string? JoinLink = null,
+    string? ActorDisplayName = null,
+    string? Reason = null);
+
+public sealed record PlatformRsvpMessageUpdate(
+    PlatformConfirmationRequest Request,
+    bool DisableActions);
+
+public enum PlatformRsvpOutcomeKind
+{
+    GroupAllConfirmed = 0,
+    GmAllConfirmed = 1,
+    GmPlayerDeclined = 2
+}
+
+public sealed record PlatformRsvpOutcomeNotification(
+    PlatformRsvpOutcomeKind Kind,
+    PlatformGroup? Group,
+    IReadOnlyList<PlatformUser> Recipients,
+    Guid SessionId,
+    string Title,
+    DateTime ScheduledAt,
+    string? ActorDisplayName = null);
+
+public sealed record PlatformRescheduleVoteUpdate(
+    PlatformGroup Group,
+    PlatformMessageRef ExistingMessage,
+    Guid ProposalId,
+    Guid SessionId,
+    string Title,
+    DateTime CurrentScheduledAt,
+    DateTimeOffset VotingDeadlineAt,
+    RescheduleVoteDecision Decision,
+    RescheduleOptionDto? SelectedOption,
+    IReadOnlyList<RescheduleOptionDto> Options,
+    IReadOnlyList<RescheduleOptionVoteDto> Votes,
+    IReadOnlyList<VoteParticipantDto> Participants);