Server-backed friends, chat, IAB scaffold + EF migrations/Postgres

- Social: EF-backed friends graph + chat (SocialService/SocialModels);
  REST endpoints (friends add/accept/decline/remove/list/requests,
  chat conversations/messages/send) with real-time hub events
  (friendRequest/social/chat). GameManager tracks online users for presence.
- Client SignalrService: friends + chat now hit the server and react to
  hub events (refetch + emit); no longer delegated to the mock.
- IAB: /api/coins/iab/verify endpoint + IabVerifyReq for Cafe Bazaar/Myket
  (token verification is a documented TODO pending store accounts/SKUs).
- Persistence: EF Core Design package + DesignTimeDbContextFactory (Postgres),
  Program auto-migrate/EnsureCreated, appsettings.Production.json.example
  with Supabase connection + live ZarinPal template.

Verified end-to-end (two users, SQLite dev): request -> accept ->
bidirectional friends, chat send with per-user fromMe, unread count +
read-on-fetch. Server + client builds clean (dotnet build, tsc, next build).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/src/Hokm.Server/Data/AppDbContext.cs

@@ -21,17 +21,52 @@ public class LedgerRow
     public DateTime CreatedAt { get; set; }
 }
 
+/// <summary>An undirected friendship, stored as two rows (a→b and b→a).</summary>
+public class FriendEdgeRow
+{
+    public long Id { get; set; }
+    public string UserId { get; set; } = "";
+    public string FriendId { get; set; } = "";
+}
+
+public class FriendRequestRow
+{
+    public long Id { get; set; }
+    public string FromUserId { get; set; } = "";
+    public string ToUserId { get; set; } = "";
+    public DateTime CreatedAt { get; set; }
+}
+
+public class MessageRow
+{
+    public long Id { get; set; }
+    public string UserId { get; set; } = ""; // sender
+    public string PeerId { get; set; } = ""; // recipient
+    public string Text { get; set; } = "";
+    public DateTime CreatedAt { get; set; }
+    public bool ReadByPeer { get; set; }
+}
+
 public class AppDbContext : DbContext
 {
     public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }
 
     public DbSet<ProfileRow> Profiles => Set<ProfileRow>();
     public DbSet<LedgerRow> Ledger => Set<LedgerRow>();
+    public DbSet<FriendEdgeRow> Friends => Set<FriendEdgeRow>();
+    public DbSet<FriendRequestRow> FriendRequests => Set<FriendRequestRow>();
+    public DbSet<MessageRow> Messages => Set<MessageRow>();
 
     protected override void OnModelCreating(ModelBuilder b)
     {
         b.Entity<ProfileRow>().HasKey(p => p.Id);
         b.Entity<LedgerRow>().HasKey(l => l.Id);
         b.Entity<LedgerRow>().HasIndex(l => l.UserId);
+        b.Entity<FriendEdgeRow>().HasKey(f => f.Id);
+        b.Entity<FriendEdgeRow>().HasIndex(f => f.UserId);
+        b.Entity<FriendRequestRow>().HasKey(r => r.Id);
+        b.Entity<FriendRequestRow>().HasIndex(r => r.ToUserId);
+        b.Entity<MessageRow>().HasKey(m => m.Id);
+        b.Entity<MessageRow>().HasIndex(m => new { m.UserId, m.PeerId });
     }
 }

server/src/Hokm.Server/Data/DesignTimeDbContextFactory.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace Hokm.Server.Data;
+
+/// <summary>
+/// Used by `dotnet ef migrations add ...` to build the context at design time.
+/// Targets Postgres (prod). Set HOKM_DESIGN_CONN to override the connection.
+///   dotnet ef migrations add InitialCreate -p src/Hokm.Server
+/// </summary>
+public sealed class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
+{
+    public AppDbContext CreateDbContext(string[] args)
+    {
+        var conn = Environment.GetEnvironmentVariable("HOKM_DESIGN_CONN")
+            ?? "Host=localhost;Database=hokm;Username=postgres;Password=postgres";
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseNpgsql(conn)
+            .Options;
+        return new AppDbContext(options);
+    }
+}

server/src/Hokm.Server/Game/GameManager.cs

@@ -141,18 +141,20 @@ public sealed class GameManager
     public void ChooseTrump(string userId, string suit) => RoomOf(userId)?.HumanChooseTrump(userId, suit);
     public void SendReaction(string userId, string reaction) => RoomOf(userId)?.Reaction(userId, reaction);
 
-    private int _online;
+    private readonly ConcurrentDictionary<string, int> _onlineUsers = new();
-    public int OnlineCount => Volatile.Read(ref _online);
+    public int OnlineCount => _onlineUsers.Count;
+    public bool IsOnline(string userId) => _onlineUsers.ContainsKey(userId);
 
     public void OnConnected(string userId)
     {
-        Interlocked.Increment(ref _online);
+        _onlineUsers.AddOrUpdate(userId, 1, (_, n) => n + 1);
         RoomOf(userId)?.SetConnected(userId, true);
     }
 
     public void OnDisconnected(string userId)
     {
-        if (Interlocked.Decrement(ref _online) < 0) Interlocked.Exchange(ref _online, 0);
+        if (_onlineUsers.AddOrUpdate(userId, 0, (_, n) => n - 1) <= 0)
+            _onlineUsers.TryRemove(userId, out _);
         CancelMatchmaking(userId);
         RoomOf(userId)?.SetConnected(userId, false);
     }

server/src/Hokm.Server/Hokm.Server.csproj

@@ -13,6 +13,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.2" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.2" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.2" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.0" />
   </ItemGroup>
 

server/src/Hokm.Server/Program.cs

@@ -7,6 +7,7 @@ using Hokm.Server.Game;
 using Hokm.Server.Hubs;
 using Hokm.Server.Payments;
 using Hokm.Server.Profiles;
+using Hokm.Server.Social;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.IdentityModel.Tokens;
@@ -32,6 +33,7 @@ builder.Services.AddDbContext<AppDbContext>(o =>
         o.UseSqlite(dbConn ?? "Data Source=hokm.db");
 });
 builder.Services.AddScoped<ProfileService>();
+builder.Services.AddScoped<SocialService>();
 
 // --- ZarinPal (sandbox) — merchant id is config-driven (admin panel later) ---
 var zp = builder.Configuration.GetSection("Zarinpal").Get<ZarinpalOptions>() ?? new ZarinpalOptions();
@@ -90,7 +92,13 @@ builder.Services.AddCors(o => o.AddDefaultPolicy(p => p
 var app = builder.Build();
 
 using (var scope = app.Services.CreateScope())
-    scope.ServiceProvider.GetRequiredService<AppDbContext>().Database.EnsureCreated();
+{
+    var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+    // Use EF migrations once any exist (prod/Postgres); otherwise create the
+    // schema directly (dev/SQLite, or before the first migration is generated).
+    if (db.Database.GetMigrations().Any()) db.Database.Migrate();
+    else db.Database.EnsureCreated();
+}
 
 app.UseCors();
 app.UseAuthentication();
@@ -172,6 +180,17 @@ app.MapGet("/api/coins/pay/callback", async (string? authority, string? status,
     return Results.Redirect($"{zp.ClientReturnUrl}/?pay=failed");
 });
 
+// Store in-app purchase (Cafe Bazaar / Myket): the native app sends the purchase
+// token; we credit the matching pack. (SKU == packId for now.)
+app.MapPost("/api/coins/iab/verify", async (ClaimsPrincipal u, ProfileService svc, IabVerifyReq req) =>
+{
+    // TODO: verify req.Token with Cafe Bazaar (Pardakht/Poolakey) or Myket dev API.
+    var (ok, p, coins) = await svc.BuyCoins(Uid(u), req.ProductId);
+    return ok
+        ? Results.Json(new { ok, profile = p, coins }, JsonOpts.Default)
+        : Results.BadRequest(new { ok = false });
+}).RequireAuthorization();
+
 app.MapGet("/api/daily", async (ClaimsPrincipal u, ProfileService svc) =>
 {
     var (day, last, avail) = await svc.GetDaily(Uid(u));
@@ -192,6 +211,39 @@ app.MapPost("/api/shop/buy", async (ClaimsPrincipal u, ProfileService svc, ShopB
         : Results.BadRequest(new { ok = false, error = err });
 }).RequireAuthorization();
 
+// --- friends + chat (server-persisted, real-time over the hub) ---
+app.MapGet("/api/friends", async (ClaimsPrincipal u, SocialService s) =>
+    Results.Json(await s.ListFriends(Uid(u)), JsonOpts.Default)).RequireAuthorization();
+app.MapGet("/api/friends/requests", async (ClaimsPrincipal u, SocialService s) =>
+    Results.Json(await s.ListRequests(Uid(u)), JsonOpts.Default)).RequireAuthorization();
+app.MapPost("/api/friends/add", async (ClaimsPrincipal u, SocialService s, QueryReq r) =>
+{
+    var (ok, fa, en) = await s.AddFriend(Uid(u), r.Query);
+    return Results.Json(new { ok, messageFa = fa, messageEn = en }, JsonOpts.Default);
+}).RequireAuthorization();
+app.MapPost("/api/friends/accept", async (ClaimsPrincipal u, SocialService s, IdReq r) =>
+{
+    if (long.TryParse(r.Id, out var id)) await s.Accept(Uid(u), id);
+    return Results.Ok();
+}).RequireAuthorization();
+app.MapPost("/api/friends/decline", async (ClaimsPrincipal u, SocialService s, IdReq r) =>
+{
+    if (long.TryParse(r.Id, out var id)) await s.Decline(Uid(u), id);
+    return Results.Ok();
+}).RequireAuthorization();
+app.MapPost("/api/friends/remove", async (ClaimsPrincipal u, SocialService s, IdReq r) =>
+{
+    await s.Remove(Uid(u), r.Id);
+    return Results.Ok();
+}).RequireAuthorization();
+
+app.MapGet("/api/chat", async (ClaimsPrincipal u, SocialService s) =>
+    Results.Json(await s.Conversations(Uid(u)), JsonOpts.Default)).RequireAuthorization();
+app.MapGet("/api/chat/messages", async (ClaimsPrincipal u, SocialService s, string peer) =>
+    Results.Json(await s.Messages(Uid(u), peer), JsonOpts.Default)).RequireAuthorization();
+app.MapPost("/api/chat/send", async (ClaimsPrincipal u, SocialService s, SendReq r) =>
+    Results.Json(await s.Send(Uid(u), r.PeerId, r.Text), JsonOpts.Default)).RequireAuthorization();
+
 app.MapHub<GameHub>("/hub/game");
 
 app.Run();
@@ -201,3 +253,7 @@ record OtpVerify(string Phone, string Code, string? Name);
 record EmailLogin(string Email, string Password, string? Name);
 record BuyReq(string PackId);
 record ShopBuyReq(string Kind, string Id, int Price);
+record IabVerifyReq(string Store, string ProductId, string Token);
+record QueryReq(string Query);
+record IdReq(string Id);
+record SendReq(string PeerId, string Text);

server/src/Hokm.Server/Social/SocialModels.cs

@@ -0,0 +1,34 @@
+namespace Hokm.Server.Social;
+
+public class FriendDto
+{
+    public string Id { get; set; } = "";
+    public string Username { get; set; } = "";
+    public string DisplayName { get; set; } = "";
+    public string Avatar { get; set; } = "a-fox";
+    public int Level { get; set; }
+    public int Rating { get; set; }
+    public string Status { get; set; } = "offline"; // online | offline
+}
+
+public class FriendRequestDto
+{
+    public string Id { get; set; } = "";
+    public FriendDto From { get; set; } = new();
+    public long CreatedAt { get; set; }
+}
+
+public class ChatMessageDto
+{
+    public string Id { get; set; } = "";
+    public bool FromMe { get; set; }
+    public string Text { get; set; } = "";
+    public long Ts { get; set; }
+}
+
+public class ConversationDto
+{
+    public FriendDto Friend { get; set; } = new();
+    public ChatMessageDto? LastMessage { get; set; }
+    public int Unread { get; set; }
+}

server/src/Hokm.Server/Social/SocialService.cs

@@ -0,0 +1,150 @@
+using System.Text.Json;
+using Hokm.Server.Data;
+using Hokm.Server.Game;
+using Hokm.Server.Hubs;
+using Hokm.Server.Profiles;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Hokm.Server.Social;
+
+public class SocialService
+{
+    private readonly AppDbContext _db;
+    private readonly GameManager _mgr;
+    private readonly IHubContext<GameHub> _hub;
+
+    public SocialService(AppDbContext db, GameManager mgr, IHubContext<GameHub> hub)
+    {
+        _db = db;
+        _mgr = mgr;
+        _hub = hub;
+    }
+
+    private async Task<FriendDto> FriendDtoFor(string userId)
+    {
+        var row = await _db.Profiles.FindAsync(userId);
+        var p = row != null ? JsonSerializer.Deserialize<ProfileDto>(row.Json, JsonOpts.Default) : null;
+        return new FriendDto
+        {
+            Id = userId,
+            Username = p?.Username ?? userId,
+            DisplayName = p?.DisplayName ?? userId,
+            Avatar = p?.Avatar ?? "a-fox",
+            Level = p?.Level ?? 1,
+            Rating = p?.Rating ?? 1000,
+            Status = _mgr.IsOnline(userId) ? "online" : "offline",
+        };
+    }
+
+    /* ----------------------------- friends ----------------------------- */
+
+    public async Task<List<FriendDto>> ListFriends(string uid)
+    {
+        var ids = await _db.Friends.Where(f => f.UserId == uid).Select(f => f.FriendId).ToListAsync();
+        var list = new List<FriendDto>();
+        foreach (var id in ids) list.Add(await FriendDtoFor(id));
+        return list;
+    }
+
+    public async Task<List<FriendRequestDto>> ListRequests(string uid)
+    {
+        var reqs = await _db.FriendRequests.Where(r => r.ToUserId == uid).ToListAsync();
+        var list = new List<FriendRequestDto>();
+        foreach (var r in reqs)
+            list.Add(new FriendRequestDto { Id = r.Id.ToString(), From = await FriendDtoFor(r.FromUserId), CreatedAt = new DateTimeOffset(r.CreatedAt).ToUnixTimeMilliseconds() });
+        return list;
+    }
+
+    public async Task<(bool ok, string messageFa, string messageEn)> AddFriend(string uid, string query)
+    {
+        var digits = new string(query.Where(char.IsDigit).ToArray());
+        var targetId = query.Contains(':') ? query.Trim() : (digits.Length >= 4 ? "phone:" + digits : query.Trim());
+
+        var target = await _db.Profiles.FindAsync(targetId);
+        if (target == null || targetId == uid)
+            return (false, "کاربر پیدا نشد", "User not found");
+        if (await _db.Friends.AnyAsync(f => f.UserId == uid && f.FriendId == targetId))
+            return (false, "از قبل دوست هستید", "Already friends");
+        if (!await _db.FriendRequests.AnyAsync(r => r.FromUserId == uid && r.ToUserId == targetId))
+        {
+            _db.FriendRequests.Add(new FriendRequestRow { FromUserId = uid, ToUserId = targetId, CreatedAt = DateTime.UtcNow });
+            await _db.SaveChangesAsync();
+            await _hub.Clients.User(targetId).SendAsync("friendRequest", await FriendDtoFor(uid));
+        }
+        return (true, "درخواست دوستی ارسال شد", "Friend request sent");
+    }
+
+    public async Task Accept(string uid, long requestId)
+    {
+        var req = await _db.FriendRequests.FirstOrDefaultAsync(r => r.Id == requestId && r.ToUserId == uid);
+        if (req == null) return;
+        _db.Friends.Add(new FriendEdgeRow { UserId = uid, FriendId = req.FromUserId });
+        _db.Friends.Add(new FriendEdgeRow { UserId = req.FromUserId, FriendId = uid });
+        _db.FriendRequests.Remove(req);
+        await _db.SaveChangesAsync();
+        await _hub.Clients.User(req.FromUserId).SendAsync("social", "friend-added");
+    }
+
+    public async Task Decline(string uid, long requestId)
+    {
+        var req = await _db.FriendRequests.FirstOrDefaultAsync(r => r.Id == requestId && r.ToUserId == uid);
+        if (req != null) { _db.FriendRequests.Remove(req); await _db.SaveChangesAsync(); }
+    }
+
+    public async Task Remove(string uid, string friendId)
+    {
+        var edges = await _db.Friends.Where(f =>
+            (f.UserId == uid && f.FriendId == friendId) || (f.UserId == friendId && f.FriendId == uid)).ToListAsync();
+        _db.Friends.RemoveRange(edges);
+        await _db.SaveChangesAsync();
+        await _hub.Clients.User(friendId).SendAsync("social", "friend-removed");
+    }
+
+    /* ------------------------------- chat ------------------------------ */
+
+    public async Task<List<ConversationDto>> Conversations(string uid)
+    {
+        var msgs = await _db.Messages.Where(m => m.UserId == uid || m.PeerId == uid).ToListAsync();
+        var byPartner = msgs.GroupBy(m => m.UserId == uid ? m.PeerId : m.UserId);
+        var convs = new List<ConversationDto>();
+        foreach (var g in byPartner)
+        {
+            var last = g.OrderByDescending(m => m.CreatedAt).First();
+            convs.Add(new ConversationDto
+            {
+                Friend = await FriendDtoFor(g.Key),
+                LastMessage = ToDto(last, uid),
+                Unread = g.Count(m => m.PeerId == uid && !m.ReadByPeer),
+            });
+        }
+        return convs.OrderByDescending(c => c.LastMessage?.Ts ?? 0).ToList();
+    }
+
+    public async Task<List<ChatMessageDto>> Messages(string uid, string peerId)
+    {
+        var msgs = await _db.Messages
+            .Where(m => (m.UserId == uid && m.PeerId == peerId) || (m.UserId == peerId && m.PeerId == uid))
+            .OrderBy(m => m.CreatedAt).ToListAsync();
+        var unread = msgs.Where(m => m.UserId == peerId && m.PeerId == uid && !m.ReadByPeer).ToList();
+        if (unread.Count > 0) { unread.ForEach(m => m.ReadByPeer = true); await _db.SaveChangesAsync(); }
+        return msgs.Select(m => ToDto(m, uid)).ToList();
+    }
+
+    public async Task<ChatMessageDto> Send(string uid, string peerId, string text)
+    {
+        var m = new MessageRow { UserId = uid, PeerId = peerId, Text = text.Trim(), CreatedAt = DateTime.UtcNow };
+        _db.Messages.Add(m);
+        await _db.SaveChangesAsync();
+        await _hub.Clients.User(peerId).SendAsync("chat", new { peerId = uid });
+        return ToDto(m, uid);
+    }
+
+    private static ChatMessageDto ToDto(MessageRow m, string uid) => new()
+    {
+        Id = m.Id.ToString(),
+        FromMe = m.UserId == uid,
+        Text = m.Text,
+        Ts = new DateTimeOffset(m.CreatedAt).ToUnixTimeMilliseconds(),
+    };
+}

server/src/Hokm.Server/appsettings.Production.json.example

@@ -0,0 +1,21 @@
+{
+  "// note": "Copy to appsettings.Production.json and fill secrets. Run with ASPNETCORE_ENVIRONMENT=Production.",
+  "Jwt": {
+    "Key": "CHANGE-ME-to-a-long-random-secret-32+chars",
+    "Issuer": "hokm",
+    "Audience": "hokm-clients"
+  },
+  "Database": {
+    "Provider": "postgres"
+  },
+  "ConnectionStrings": {
+    "// Supabase": "Project Settings → Database → Connection string (use the pooled 6543 or direct 5432)",
+    "Default": "Host=db.<project>.supabase.co;Port=5432;Database=postgres;Username=postgres;Password=<password>;SSL Mode=Require;Trust Server Certificate=true"
+  },
+  "Zarinpal": {
+    "MerchantId": "<your-live-merchant-id>",
+    "Sandbox": false,
+    "CallbackUrl": "https://api.yourdomain.com/api/coins/pay/callback",
+    "ClientReturnUrl": "https://yourdomain.com"
+  }
+}

src/lib/online/signalr-service.ts

@@ -53,6 +53,8 @@ export class SignalrService implements OnlineService {
   private notifCbs = new Set<(n: AppNotification) => void>();
   private profileCbs = new Set<(p: UserProfile) => void>();
   private rewardCbs = new Set<(r: RewardResult) => void>();
+  private friendCbs = new Set<(f: Friend[]) => void>();
+  private chatCbs = new Set<(id: string, m: ChatMessage[]) => void>();
   private cachedProfile: UserProfile | null = null;
   private mockNotifUnsub?: () => void;
 
@@ -122,6 +124,23 @@ export class SignalrService implements OnlineService {
       this.profileCbs.forEach((cb) => cb(p));
     });
     conn.on("reward", (r: RewardResult) => this.rewardCbs.forEach((cb) => cb(r)));
+    conn.on("friendRequest", (from: Friend) => {
+      this.notifCbs.forEach((cb) =>
+        cb({
+          id: `n_fr_${from.id}`,
+          kind: "friend_request",
+          titleFa: "درخواست دوستی جدید",
+          titleEn: "New friend request",
+          bodyFa: `${from.displayName} می‌خواهد با شما دوست شود`,
+          bodyEn: `${from.displayName} wants to be your friend`,
+          icon: "👥",
+          ts: Date.now(),
+          read: false,
+        } as AppNotification));
+      void this.refreshFriends();
+    });
+    conn.on("social", () => void this.refreshFriends());
+    conn.on("chat", (m: { peerId: string }) => void this.emitChat(m.peerId));
 
     this.conn = conn;
     try {
@@ -306,13 +325,33 @@ export class SignalrService implements OnlineService {
     return p;
   }
 
-  listFriends() { return this.mock.listFriends(); }
+  private async refreshFriends() {
-  listRequests() { return this.mock.listRequests(); }
+    try {
-  addFriend(q: string) { return this.mock.addFriend(q); }
+      const f = await this.listFriends();
-  acceptRequest(id: string) { return this.mock.acceptRequest(id); }
+      this.friendCbs.forEach((cb) => cb(f));
-  declineRequest(id: string) { return this.mock.declineRequest(id); }
+    } catch {
-  removeFriend(id: string) { return this.mock.removeFriend(id); }
+      /* ignore */
-  onFriends(cb: (f: Friend[]) => void) { return this.mock.onFriends(cb); }
+    }
+  }
+  private async emitChat(peerId: string) {
+    try {
+      const m = await this.getMessages(peerId);
+      this.chatCbs.forEach((cb) => cb(peerId, m));
+    } catch {
+      /* ignore */
+    }
+  }
+
+  listFriends() { return this.getJson<Friend[]>("/api/friends"); }
+  listRequests() { return this.getJson<FriendRequest[]>("/api/friends/requests"); }
+  addFriend(q: string) {
+    return this.send<{ ok: boolean; messageFa: string; messageEn: string }>(
+      "POST", "/api/friends/add", { query: q });
+  }
+  async acceptRequest(id: string) { await this.send<unknown>("POST", "/api/friends/accept", { id }); }
+  async declineRequest(id: string) { await this.send<unknown>("POST", "/api/friends/decline", { id }); }
+  async removeFriend(id: string) { await this.send<unknown>("POST", "/api/friends/remove", { id }); }
+  onFriends(cb: (f: Friend[]) => void) { this.friendCbs.add(cb); return () => this.friendCbs.delete(cb); }
 
   createRoom(o: CreateRoomOptions) { return this.mock.createRoom(o); }
   setPartner(roomId: string, friendId: string | null) { return this.mock.setPartner(roomId, friendId); }
@@ -323,11 +362,15 @@ export class SignalrService implements OnlineService {
   leaveRoom(roomId: string) { return this.mock.leaveRoom(roomId); }
   onRoom(cb: (r: Room) => void) { return this.mock.onRoom(cb); }
 
-  listConversations(): Promise<Conversation[]> { return this.mock.listConversations(); }
+  listConversations(): Promise<Conversation[]> { return this.getJson<Conversation[]>("/api/chat"); }
-  getMessages(id: string): Promise<ChatMessage[]> { return this.mock.getMessages(id); }
+  getMessages(id: string): Promise<ChatMessage[]> {
-  sendMessage(id: string, text: string) { return this.mock.sendMessage(id, text); }
+    return this.getJson<ChatMessage[]>(`/api/chat/messages?peer=${encodeURIComponent(id)}`);
-  markRead(id: string) { return this.mock.markRead(id); }
+  }
-  onChat(cb: (id: string, m: ChatMessage[]) => void) { return this.mock.onChat(cb); }
+  sendMessage(id: string, text: string) {
+    return this.send<ChatMessage>("POST", "/api/chat/send", { peerId: id, text });
+  }
+  async markRead() { /* server marks read when messages are fetched */ }
+  onChat(cb: (id: string, m: ChatMessage[]) => void) { this.chatCbs.add(cb); return () => this.chatCbs.delete(cb); }
 
   onNotification(cb: (n: AppNotification) => void): Unsubscribe {
     this.notifCbs.add(cb);