From d373ff49ba236ac1521876fdca7e59947ade2efc Mon Sep 17 00:00:00 2001
From: Toutsu <Hegin4@yandex.ru>
Date: Tue, 19 May 2026 11:22:44 +0300
Subject: [PATCH] feat(discord): add DiscordPlatformMessenger
 IPlatformMessenger implementation

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 .../Discord/DiscordPlatformMessenger.cs       | 71 +++++++++++++++++++
 .../Discord/DiscordPlatformMessengerTests.cs  | 21 ++++++
 2 files changed, 92 insertions(+)
 create mode 100644 src/GmRelay.DiscordBot/Infrastructure/Discord/DiscordPlatformMessenger.cs
 create mode 100644 tests/GmRelay.Bot.Tests/Discord/DiscordPlatformMessengerTests.cs

diff --git a/src/GmRelay.DiscordBot/Infrastructure/Discord/DiscordPlatformMessenger.cs b/src/GmRelay.DiscordBot/Infrastructure/Discord/DiscordPlatformMessenger.cs
new file mode 100644
index 0000000..bc435bc
--- /dev/null
+++ b/src/GmRelay.DiscordBot/Infrastructure/Discord/DiscordPlatformMessenger.cs
@@ -0,0 +1,71 @@
+using GmRelay.DiscordBot.Rendering;
+using GmRelay.Shared.Platform;
+using GmRelay.Shared.Rendering;
+using NetCord;
+using NetCord.Rest;
+
+namespace GmRelay.DiscordBot.Infrastructure.Discord;
+
+public sealed class DiscordPlatformMessenger(RestClient restClient) : IPlatformMessenger
+{
+    public async Task<PlatformMessageRef> SendScheduleAsync(PlatformScheduleMessage message, CancellationToken ct)
+    {
+        var (embeds, actionRows) = DiscordSessionBatchRenderer.Render(message.View);
+
+        var channelId = ulong.Parse(message.Group.ExternalChannelId
+            ?? message.Group.ExternalGroupId);
+
+        var msg = await restClient.SendMessageAsync(
+            channelId,
+            new MessageProperties()
+                .WithEmbeds(embeds)
+                .WithComponents(actionRows));
+
+        return new PlatformMessageRef(
+            PlatformKind.Discord,
+            message.Group.ExternalGroupId,
+            null,
+            msg.Id.ToString());
+    }
+
+    public async Task UpdateScheduleAsync(PlatformScheduleMessage message, CancellationToken ct)
+    {
+        if (message.ExistingMessage is null)
+            return;
+
+        var (embeds, actionRows) = DiscordSessionBatchRenderer.Render(message.View);
+
+        var channelId = ulong.Parse(message.Group.ExternalChannelId
+            ?? message.Group.ExternalGroupId);
+        var messageId = ulong.Parse(message.ExistingMessage.ExternalMessageId);
+
+        await restClient.ModifyMessageAsync(
+            channelId,
+            messageId,
+            options =>
+            {
+                options.Embeds = embeds;
+                options.Components = actionRows;
+            });
+    }
+
+    public Task SendGroupMessageAsync(PlatformGroup group, string htmlText, CancellationToken ct)
+    {
+        return Task.CompletedTask;
+    }
+
+    public Task SendPrivateMessageAsync(PlatformPrivateMessage message, CancellationToken ct)
+    {
+        return Task.CompletedTask;
+    }
+
+    public Task AnswerInteractionAsync(PlatformInteractionReply reply, CancellationToken ct)
+    {
+        return Task.CompletedTask;
+    }
+
+    public Task SendCalendarFileAsync(PlatformCalendarFile file, CancellationToken ct)
+    {
+        return Task.CompletedTask;
+    }
+}
diff --git a/tests/GmRelay.Bot.Tests/Discord/DiscordPlatformMessengerTests.cs b/tests/GmRelay.Bot.Tests/Discord/DiscordPlatformMessengerTests.cs
new file mode 100644
index 0000000..a59eaee
--- /dev/null
+++ b/tests/GmRelay.Bot.Tests/Discord/DiscordPlatformMessengerTests.cs
@@ -0,0 +1,21 @@
+using GmRelay.DiscordBot.Infrastructure.Discord;
+using GmRelay.Shared.Platform;
+using GmRelay.Shared.Rendering;
+
+namespace GmRelay.Bot.Tests.Discord;
+
+public sealed class DiscordPlatformMessengerTests
+{
+    [Fact]
+    public void Constructor_ShouldAcceptRestClient()
+    {
+        var constructor = typeof(DiscordPlatformMessenger).GetConstructor(new[] { typeof(NetCord.Rest.RestClient) });
+        Assert.NotNull(constructor);
+    }
+
+    [Fact]
+    public void DiscordPlatformMessenger_ShouldImplementIPlatformMessenger()
+    {
+        Assert.True(typeof(IPlatformMessenger).IsAssignableFrom(typeof(DiscordPlatformMessenger)));
+    }
+}