feat(squad): in-memory squad/lobby state + wire squad functions

Adds SquadService (singleton, process-local) tracking squads by the
squadId the client shares across party members, plus a user->squad index
so TryGetCompleteSquadInfo (no squadId in request) can resolve the
caller's squad. Members are lazily registered on any squad call.

- TryGetCompleteSquadInfo: returns the caller's real squad.
- SquadMemberReadyForMatch: joins the squad, records readiness/map,
  returns the squad + whether everyone is ready.
- SquadMemberSelectedMap: records the member's selected map.
- DbUserService.FindByIdAsync: resolve display name for squad members.

Groundwork for the station lobby; assumes the client drives squads via
these calls with a shared squadId (to confirm with a 2-client session).
Real-time SignalR push (unknown event names) deferred; the squad is
carried in responses + TryGetCompleteSquadInfo for now.

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

src/Prospect.Server.Api/Services/CloudScript/Functions/SquadMemberReadyForMatch.cs

@@ -1,6 +1,9 @@
 using System.Text.Json.Serialization;
 using Prospect.Server.Api.Services.CloudScript;
 using Prospect.Server.Api.Services.Auth.Extensions;
+using Prospect.Server.Api.Services.Database;
+using Prospect.Server.Api.Services.Database.Models;
+using Prospect.Server.Api.Services.Squad;
 using Microsoft.AspNetCore.SignalR;
 using Prospect.Server.Api.Hubs;
 
@@ -28,12 +31,16 @@ public class SquadMemberReadyForMatchFunction : ICloudScriptFunction<SquadMember
     private readonly ILogger<SquadMemberReadyForMatchFunction> _logger;
     private readonly IHttpContextAccessor _httpContextAccessor;
     private readonly IHubContext<CycleHub> _hubContext;
+    private readonly SquadService _squadService;
+    private readonly DbUserService _userService;
 
-    public SquadMemberReadyForMatchFunction(ILogger<SquadMemberReadyForMatchFunction> logger, IHttpContextAccessor httpContextAccessor, IHubContext<CycleHub> hubContext)
+    public SquadMemberReadyForMatchFunction(ILogger<SquadMemberReadyForMatchFunction> logger, IHttpContextAccessor httpContextAccessor, IHubContext<CycleHub> hubContext, SquadService squadService, DbUserService userService)
     {
         _httpContextAccessor = httpContextAccessor;
         _logger = logger;
         _hubContext = hubContext;
+        _squadService = squadService;
+        _userService = userService;
     }
 
     public async Task<SquadMemberReadyForMatchResponse> ExecuteAsync(SquadMemberReadyForMatchRequest request)
@@ -44,27 +51,25 @@ public class SquadMemberReadyForMatchFunction : ICloudScriptFunction<SquadMember
             throw new CloudScriptException("CloudScript was not called within a http request");
         }
         var userId = context.User.FindAuthUserId();
+        var squadId = string.IsNullOrEmpty(request.SquadID) ? userId : request.SquadID;
+
+        // Register the caller into the squad (party is formed client-side; each member's client
+        // calls this with the shared squadId) and record their readiness / selected map.
+        var displayName = (await _userService.FindByIdAsync(userId))?.DisplayName ?? "";
+        _squadService.JoinOrCreate(squadId, userId, displayName);
+        var ready = request.matchmakingSettings?.isReadyForMatch ?? false;
+        _squadService.SetReady(squadId, userId, ready, request.matchmakingSettings?.selectedMapName);
+
+        var squad = _squadService.Get(squadId)!;
+        var isSquadReady = _squadService.IsSquadReady(squadId);
+        _logger.LogInformation("SquadMemberReadyForMatch: {User} ready={Ready} in squad {Squad} ({Count} member(s), squadReady={SquadReady})",
+            userId, ready, squadId, squad.Members.Count, isSquadReady);
 
         return new SquadMemberReadyForMatchResponse
         {
             Result = 0, // EYSquadActionResult::OK
-            Squad = new FYPlayFabSquad {
+            Squad = _squadService.ToClientSquad(squad),
-                SquadID = "100", // TODO
+            IsSquadReadyForMatch = isSquadReady,
-                // Members = [
-                //     new FYPlayFabSquadMember {
-                //         Profile = new FYPlayFabPlayerProfile {
-                //             PlayerId = userId,
-                //         },
-                //         onlineState = 0, // EYUserState::IN_STATION
-                //         matchmakingSettings = new FYUserMatchmakingSettings {
-                //             isReadyForMatch = true,
-                //             isSecretLeader = true,
-                //             selectedMapName = "Map01",
-                //         }
-                //     }
-                // ],
-            },
-            IsSquadReadyForMatch = true,
         };
     }
 }

src/Prospect.Server.Api/Services/CloudScript/Functions/SquadMemberSelectedMap.cs

@@ -1,5 +1,8 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
+using Prospect.Server.Api.Services.Auth.Extensions;
 using Prospect.Server.Api.Services.CloudScript;
+using Prospect.Server.Api.Services.Squad;
+
 public class SquadMemberSelectedMapRequest
 {
     [JsonPropertyName("squadId")]
@@ -17,15 +20,26 @@ public class SquadMemberSelectedMapResponse
 public class SquadMemberSelectedMapFunction : ICloudScriptFunction<SquadMemberSelectedMapRequest, SquadMemberSelectedMapResponse>
 {
     private readonly ILogger<SquadMemberSelectedMapFunction> _logger;
+    private readonly IHttpContextAccessor _httpContextAccessor;
+    private readonly SquadService _squadService;
 
-    public SquadMemberSelectedMapFunction(ILogger<SquadMemberSelectedMapFunction> logger)
+    public SquadMemberSelectedMapFunction(ILogger<SquadMemberSelectedMapFunction> logger, IHttpContextAccessor httpContextAccessor, SquadService squadService)
     {
         _logger = logger;
+        _httpContextAccessor = httpContextAccessor;
+        _squadService = squadService;
     }
 
-    public async Task<SquadMemberSelectedMapResponse> ExecuteAsync(SquadMemberSelectedMapRequest request)
+    public Task<SquadMemberSelectedMapResponse> ExecuteAsync(SquadMemberSelectedMapRequest request)
     {
-        return new SquadMemberSelectedMapResponse
+        var context = _httpContextAccessor.HttpContext;
-        {};
+        if (context != null && !string.IsNullOrEmpty(request.SquadID))
+        {
+            var userId = context.User.FindAuthUserId();
+            _squadService.JoinOrCreate(request.SquadID, userId, "");
+            _squadService.SetMap(request.SquadID, userId, request.SelectedMapName ?? "");
+            _logger.LogInformation("SquadMemberSelectedMap: {User} -> {Map} (squad {Squad})", userId, request.SelectedMapName, request.SquadID);
+        }
+        return Task.FromResult(new SquadMemberSelectedMapResponse { });
     }
 }

src/Prospect.Server.Api/Services/CloudScript/Functions/TryGetCompleteSquadInfo.cs

@@ -1,5 +1,8 @@
 using System.Text.Json.Serialization;
+using Prospect.Server.Api.Services.Auth.Extensions;
 using Prospect.Server.Api.Services.CloudScript;
+using Prospect.Server.Api.Services.Database;
+using Prospect.Server.Api.Services.Squad;
 
 public class TryGetCompleteSquadInfoRequest
 {
@@ -51,26 +54,30 @@ public class TryGetCompleteSquadInfoFunction : ICloudScriptFunction<TryGetComple
 {
     private readonly ILogger<TryGetCompleteSquadInfoFunction> _logger;
     private readonly IHttpContextAccessor _httpContextAccessor;
+    private readonly SquadService _squadService;
 
-    public TryGetCompleteSquadInfoFunction(ILogger<TryGetCompleteSquadInfoFunction> logger, IHttpContextAccessor httpContextAccessor)
+    public TryGetCompleteSquadInfoFunction(ILogger<TryGetCompleteSquadInfoFunction> logger, IHttpContextAccessor httpContextAccessor, SquadService squadService)
     {
         _httpContextAccessor = httpContextAccessor;
         _logger = logger;
+        _squadService = squadService;
     }
 
-    public async Task<FYPlayFabSquad> ExecuteAsync(TryGetCompleteSquadInfoRequest request)
+    public Task<FYPlayFabSquad> ExecuteAsync(TryGetCompleteSquadInfoRequest request)
     {
         var context = _httpContextAccessor.HttpContext;
         if (context == null)
         {
             throw new CloudScriptException("CloudScript was not called within a http request");
         }
-        // var userId = context.User.FindAuthUserId();
+        var userId = context.User.FindAuthUserId();
-
+        var squad = _squadService.GetByUser(userId);
-        return new FYPlayFabSquad
+        if (squad == null)
         {
-            // SquadID = "100",
+            // Not in a squad yet — return an empty squad (same as the previous stub).
-            // Members = [],
+            return Task.FromResult(new FYPlayFabSquad());
-        };
+        }
+        _logger.LogInformation("TryGetCompleteSquadInfo: user {User} in squad {Squad} ({Count} member(s))", userId, squad.SquadId, squad.Members.Count);
+        return Task.FromResult(_squadService.ToClientSquad(squad));
     }
 }

src/Prospect.Server.Api/Services/Database/DbUserService.cs

@@ -18,6 +18,12 @@ public class DbUserService : BaseDbService<PlayFabUser>
             auth.Key == key)).FirstOrDefaultAsync();
     }
 
+    // Resolve a player by its PlayFab id (used to display squad member names).
+    public async Task<PlayFabUser> FindByIdAsync(string id)
+    {
+        return await Collection.Find(user => user.Id == id).FirstOrDefaultAsync();
+    }
+
     private async Task<PlayFabUser> CreateAsync(PlayFabUserAuthType type, string key)
     {
         var user = new PlayFabUser

src/Prospect.Server.Api/Services/Squad/SquadService.cs

@@ -0,0 +1,99 @@
+using System.Collections.Concurrent;
+
+namespace Prospect.Server.Api.Services.Squad;
+
+// In-memory squad/lobby state. Squads are keyed by the squadId the client provides on the
+// SquadMember* calls (the client forms the party and shares a squadId; each member's client
+// then calls the backend with it). A member is (lazily) registered into that squad on any
+// squad call, and the current squad for a user is tracked so TryGetCompleteSquadInfo — which
+// carries no squadId — can still return it. State is process-local (fine for a small server).
+public class SquadMemberInfo
+{
+    public string UserId { get; set; } = "";
+    public string DisplayName { get; set; } = "";
+    public int OnlineState { get; set; }
+    public bool IsReady { get; set; }
+    public string SelectedMap { get; set; } = "";
+    public bool IsLeader { get; set; }
+}
+
+public class SquadInfo
+{
+    public string SquadId { get; set; } = "";
+    public ConcurrentDictionary<string, SquadMemberInfo> Members { get; } = new();
+}
+
+public class SquadService
+{
+    private readonly ConcurrentDictionary<string, SquadInfo> _squads = new();
+    private readonly ConcurrentDictionary<string, string> _userToSquad = new();
+
+    public SquadInfo JoinOrCreate(string squadId, string userId, string displayName)
+    {
+        var squad = _squads.GetOrAdd(squadId, id => new SquadInfo { SquadId = id });
+        var isFirst = squad.Members.IsEmpty;
+        var member = squad.Members.GetOrAdd(userId, uid => new SquadMemberInfo { UserId = uid, IsLeader = isFirst });
+        if (!string.IsNullOrEmpty(displayName)) member.DisplayName = displayName;
+        _userToSquad[userId] = squadId;
+        return squad;
+    }
+
+    public SquadInfo? GetByUser(string userId)
+        => _userToSquad.TryGetValue(userId, out var sid) && _squads.TryGetValue(sid, out var sq) ? sq : null;
+
+    public SquadInfo? Get(string squadId)
+        => _squads.TryGetValue(squadId, out var sq) ? sq : null;
+
+    public void SetReady(string squadId, string userId, bool ready, string? selectedMap)
+    {
+        if (_squads.TryGetValue(squadId, out var sq) && sq.Members.TryGetValue(userId, out var m))
+        {
+            m.IsReady = ready;
+            if (!string.IsNullOrEmpty(selectedMap)) m.SelectedMap = selectedMap;
+        }
+    }
+
+    public void SetMap(string squadId, string userId, string map)
+    {
+        if (_squads.TryGetValue(squadId, out var sq) && sq.Members.TryGetValue(userId, out var m))
+            m.SelectedMap = map;
+    }
+
+    public bool IsSquadReady(string squadId)
+        => _squads.TryGetValue(squadId, out var sq) && !sq.Members.IsEmpty && sq.Members.Values.All(m => m.IsReady);
+
+    public void Leave(string userId)
+    {
+        if (_userToSquad.TryRemove(userId, out var sid) && _squads.TryGetValue(sid, out var sq))
+        {
+            sq.Members.TryRemove(userId, out _);
+            if (sq.Members.IsEmpty) _squads.TryRemove(sid, out _);
+        }
+    }
+
+    // Build the client-facing squad object (models live in the global namespace).
+    public FYPlayFabSquad ToClientSquad(SquadInfo squad)
+    {
+        return new FYPlayFabSquad
+        {
+            SquadID = squad.SquadId,
+            Members = squad.Members.Values.Select(m => new FYPlayFabSquadMember
+            {
+                Profile = new FYPlayFabPlayerProfile
+                {
+                    PlayerId = m.UserId,
+                    DisplayName = m.DisplayName,
+                    AvatarUrl = "",
+                },
+                onlineState = m.OnlineState,
+                matchmakingSettings = new FYUserMatchmakingSettings
+                {
+                    isReadyForMatch = m.IsReady,
+                    selectedMapName = m.SelectedMap,
+                    isSecretLeader = m.IsLeader,
+                },
+                mapRowNamesUnlocked = Array.Empty<string>(),
+            }).ToArray(),
+        };
+    }
+}

src/Prospect.Server.Api/Startup.cs

@@ -35,6 +35,8 @@ public class Startup
 
         services.AddSingleton<DbUserDataService>();
 
+        services.AddSingleton<Prospect.Server.Api.Services.Squad.SquadService>();
+
         services.AddHostedService<QosService>();
         services.AddSingleton<QosServer>();