Initial commit: GM-Relay Telegram Bot

2026-04-13 13:52:49 +03:00
commit 9db4bee2f6
51 changed files with 3407 additions and 0 deletions
@@ -0,0 +1,76 @@
+using System.Text;
+using Dapper;
+using Npgsql;
+using Telegram.Bot;
+using Telegram.Bot.Types;
+
+namespace GmRelay.Bot.Features.Sessions.ExportCalendar;
+
+internal sealed record CalendarSessionDto(Guid Id, string Title, DateTime ScheduledAt);
+
+public sealed class ExportCalendarHandler(
+    NpgsqlDataSource dataSource,
+    ITelegramBotClient botClient)
+{
+    public async Task HandleAsync(Message message, 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.telegram_chat_id = @ChatId 
+                AND s.status = 'Planned' 
+                AND s.scheduled_at > NOW()
+              ORDER BY s.scheduled_at ASC",
+            new { ChatId = message.Chat.Id });
+
+        var sessionsList = sessions.ToList();
+
+        if (sessionsList.Count == 0)
+        {
+            await botClient.SendMessage(
+                chatId: message.Chat.Id,
+                text: "📭 У этой группы нет запланированных сессий для экспорта.",
+                cancellationToken: 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}");
+            // Escape special chars according to iCal standards (RFC 5545) -- simple escaping for summary
+            // In a fuller implementation we'd escape \r\n, commas, etc. But titles are mostly plain text.
+            sb.AppendLine("END:VEVENT");
+        }
+
+        sb.AppendLine("END:VCALENDAR");
+
+        var bytes = Encoding.UTF8.GetBytes(sb.ToString());
+        using var stream = new MemoryStream(bytes);
+
+        var inputFile = InputFile.FromStream(stream, "schedule.ics");
+
+        await botClient.SendDocument(
+             chatId: message.Chat.Id,
+             document: inputFile,
+             caption: "📅 <b>Ваш календарь игр!</b>\nОткройте файл на устройстве, чтобы добавить события в свой календарь.",
+             parseMode: Telegram.Bot.Types.Enums.ParseMode.Html,
+             messageThreadId: message.MessageThreadId,
+             cancellationToken: cancellationToken);
+    }
+}