feat: add campaign templates and recurring schedules

src/GmRelay.Web/Services/AuthorizedSessionService.cs

@@ -128,6 +128,60 @@ public sealed class AuthorizedSessionService(ISessionStore sessionStore)
         return await sessionStore.CloneBatchAsync(batchId, batch.GroupId, interval);
     }
 
+    public async Task<List<WebCampaignTemplate>?> GetCampaignTemplatesForGmAsync(Guid groupId, long gmId)
+    {
+        if (!await GroupBelongsToGmAsync(groupId, gmId))
+        {
+            return null;
+        }
+
+        return await sessionStore.GetCampaignTemplatesAsync(groupId);
+    }
+
+    public async Task<WebCampaignTemplate> CreateCampaignTemplateForGmAsync(
+        Guid groupId,
+        long gmId,
+        CreateCampaignTemplateRequest request)
+    {
+        if (!await GroupBelongsToGmAsync(groupId, gmId))
+        {
+            throw new SessionAccessDeniedException(groupId, gmId);
+        }
+
+        var normalizedRequest = NormalizeCampaignTemplateRequest(request);
+        return await sessionStore.CreateCampaignTemplateAsync(groupId, normalizedRequest);
+    }
+
+    public async Task DeleteCampaignTemplateForGmAsync(Guid templateId, long gmId)
+    {
+        var template = await sessionStore.GetCampaignTemplateAsync(templateId);
+        if (template is null || !await GroupBelongsToGmAsync(template.GroupId, gmId))
+        {
+            throw new SessionAccessDeniedException(templateId, gmId);
+        }
+
+        await sessionStore.DeleteCampaignTemplateAsync(templateId, template.GroupId);
+    }
+
+    public async Task<WebSessionBatch> CreateBatchFromCampaignTemplateForGmAsync(
+        Guid templateId,
+        long gmId,
+        DateTime firstScheduledAt)
+    {
+        if (firstScheduledAt <= DateTime.UtcNow)
+        {
+            throw new ArgumentOutOfRangeException(nameof(firstScheduledAt), firstScheduledAt, "First scheduled time must be in the future.");
+        }
+
+        var template = await sessionStore.GetCampaignTemplateAsync(templateId);
+        if (template is null || !await GroupBelongsToGmAsync(template.GroupId, gmId))
+        {
+            throw new SessionAccessDeniedException(templateId, gmId);
+        }
+
+        return await sessionStore.CreateBatchFromTemplateAsync(templateId, template.GroupId, firstScheduledAt);
+    }
+
     public async Task AddCoGmForOwnerAsync(Guid groupId, long ownerTelegramId, long coGmTelegramId, string displayName, string? telegramUsername)
     {
         if (coGmTelegramId <= 0)
@@ -169,4 +223,48 @@ public sealed class AuthorizedSessionService(ISessionStore sessionStore)
     {
         return await sessionStore.IsGroupManagerAsync(groupId, gmId);
     }
+
+    private static CreateCampaignTemplateRequest NormalizeCampaignTemplateRequest(CreateCampaignTemplateRequest request)
+    {
+        var name = request.Name.Trim();
+        var title = request.Title.Trim();
+        var joinLink = request.JoinLink.Trim();
+
+        if (name.Length == 0)
+        {
+            throw new ArgumentException("Template name must not be empty.", nameof(request));
+        }
+
+        if (title.Length == 0)
+        {
+            throw new ArgumentException("Session title must not be empty.", nameof(request));
+        }
+
+        if (joinLink.Length == 0)
+        {
+            throw new ArgumentException("Join link must not be empty.", nameof(request));
+        }
+
+        if (request.SessionCount is < 1 or > 52)
+        {
+            throw new ArgumentOutOfRangeException(nameof(request), request.SessionCount, "Session count must be between 1 and 52.");
+        }
+
+        if (request.IntervalDays is < 1 or > 365)
+        {
+            throw new ArgumentOutOfRangeException(nameof(request), request.IntervalDays, "Interval must be between 1 and 365 days.");
+        }
+
+        if (request.MaxPlayers is <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(request), request.MaxPlayers, "Seat limit must be greater than zero.");
+        }
+
+        return request with
+        {
+            Name = name,
+            Title = title,
+            JoinLink = joinLink
+        };
+    }
 }