implement `BuddyService`

add ``CreatedAt`` to ``Buddy`` model
add missing schemas

src/Migrations/20250303212804_Buddies_CreateDate.cs

@@ -0,0 +1,114 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace sodoff.Migrations
+{
+    /// <inheritdoc />
+    public partial class Buddies_CreateDate : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Buddy_Vikings_BuddyVikingId",
+                table: "Buddy");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Buddy_Vikings_VikingId",
+                table: "Buddy");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Buddy",
+                table: "Buddy");
+
+            migrationBuilder.RenameTable(
+                name: "Buddy",
+                newName: "Buddies");
+
+            migrationBuilder.RenameIndex(
+                name: "IX_Buddy_BuddyVikingId",
+                table: "Buddies",
+                newName: "IX_Buddies_BuddyVikingId");
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "CreatedAt",
+                table: "Buddies",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Buddies",
+                table: "Buddies",
+                column: "VikingId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Buddies_Vikings_BuddyVikingId",
+                table: "Buddies",
+                column: "BuddyVikingId",
+                principalTable: "Vikings",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Buddies_Vikings_VikingId",
+                table: "Buddies",
+                column: "VikingId",
+                principalTable: "Vikings",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Buddies_Vikings_BuddyVikingId",
+                table: "Buddies");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Buddies_Vikings_VikingId",
+                table: "Buddies");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Buddies",
+                table: "Buddies");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedAt",
+                table: "Buddies");
+
+            migrationBuilder.RenameTable(
+                name: "Buddies",
+                newName: "Buddy");
+
+            migrationBuilder.RenameIndex(
+                name: "IX_Buddies_BuddyVikingId",
+                table: "Buddy",
+                newName: "IX_Buddy_BuddyVikingId");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Buddy",
+                table: "Buddy",
+                column: "VikingId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Buddy_Vikings_BuddyVikingId",
+                table: "Buddy",
+                column: "BuddyVikingId",
+                principalTable: "Vikings",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Buddy_Vikings_VikingId",
+                table: "Buddy",
+                column: "VikingId",
+                principalTable: "Vikings",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+    }
+}

src/Migrations/DBContextModelSnapshot.cs

@@ -84,6 +84,9 @@ namespace sodoff.Migrations
                     b.Property<int>("BuddyVikingId")
                         .HasColumnType("INTEGER");
 
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
                     b.Property<bool>("IsBestFriend1")
                         .HasColumnType("INTEGER");
 
@@ -94,7 +97,7 @@ namespace sodoff.Migrations
 
                     b.HasIndex("BuddyVikingId");
 
-                    b.ToTable("Buddy");
+                    b.ToTable("Buddies");
                 });
 
             modelBuilder.Entity("sodoff.Model.Dragon", b =>

src/Model/Buddy.cs

@@ -17,6 +17,8 @@ public class Buddy
     public bool IsBestFriend1 { get; set; }
     public bool IsBestFriend2 { get; set; }
 
+    public DateTime CreatedAt { get; set; }
+
     public virtual Viking? Viking { get; set; }
     public virtual Viking? BuddyViking { get; set; }
 }

src/Schema/BuddyActionResult.cs

@@ -0,0 +1,22 @@
+using sodoff.Schema;
+using System.Xml.Serialization;
+
+namespace sodoff.Schema
+{
+    [XmlRoot(ElementName = "BuddyActionResult", Namespace = "")]
+    [Serializable]
+    public class BuddyActionResult
+    {
+        // Token: 0x04000203 RID: 515
+        [XmlElement(ElementName = "Result")]
+        public BuddyActionResultType Result;
+
+        // Token: 0x04000204 RID: 516
+        [XmlElement(ElementName = "Status")]
+        public BuddyStatus Status;
+
+        // Token: 0x04000205 RID: 517
+        [XmlElement(ElementName = "BuddyUserID")]
+        public string BuddyUserID;
+    }
+}

src/Schema/BuddyActionResultType.cs

@@ -0,0 +1,30 @@
+using System.Xml.Serialization;
+
+namespace sodoff.Schema
+{
+    [Flags]
+    public enum BuddyActionResultType
+    {
+        // Token: 0x04000217 RID: 535
+        [XmlEnum("0")]
+        Unknown = 0,
+        // Token: 0x04000218 RID: 536
+        [XmlEnum("1")]
+        Success = 1,
+        // Token: 0x04000219 RID: 537
+        [XmlEnum("2")]
+        BuddyListFull = 2,
+        // Token: 0x0400021A RID: 538
+        [XmlEnum("3")]
+        FriendBuddyListFull = 3,
+        // Token: 0x0400021B RID: 539
+        [XmlEnum("4")]
+        AlreadyInList = 4,
+        // Token: 0x0400021C RID: 540
+        [XmlEnum("5")]
+        InvalidFriendCode = 5,
+        // Token: 0x0400021D RID: 541
+        [XmlEnum("6")]
+        CannotAddSelf = 6
+    }
+}

src/Services/BuddyService.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Data;
+using sodoff.Model;
+using sodoff.Schema;
+using sodoff.Util;
+
+namespace sodoff.Services;
+
+public class BuddyService
+{
+    private readonly DBContext ctx;
+    private readonly MessagingService messagingService;
+    public BuddyService(DBContext ctx, MessagingService messagingService)
+    {
+        this.ctx = ctx;
+        this.messagingService = messagingService;
+    }
+
+    public BuddyActionResult CreateBuddyRelation(Viking viking1, Viking viking2, BuddyStatus buddyStatus1 = BuddyStatus.PendingApprovalFromOther, BuddyStatus buddyStatus2 = BuddyStatus.PendingApprovalFromSelf)
+    {
+        // get execution UTC timestamp
+        DateTime now = DateTime.UtcNow;
+
+        // construct buddy
+        Model.Buddy buddy = new Model.Buddy
+        {
+            Viking = viking1,
+            VikingId = viking1.Id,
+            BuddyViking = viking2,
+            BuddyVikingId = viking2.Id,
+            BuddyStatus1 = buddyStatus1,
+            BuddyStatus2 = buddyStatus2,
+            IsBestFriend1 = false,
+            IsBestFriend2 = false,
+            CreatedAt = now
+        };
+
+        // do not add if viking1 is on a different game version than viking2
+        if (viking1.GameVersion < viking2.GameVersion) return new BuddyActionResult { Result = BuddyActionResultType.InvalidFriendCode };
+
+        // do not add if relationship already exists
+        Model.Buddy? existingBuddy = ctx.Buddies.FirstOrDefault(e => e.VikingId == buddy.VikingId && e.BuddyVikingId == buddy.BuddyVikingId);
+        if (existingBuddy != null) return new BuddyActionResult { Result = BuddyActionResultType.AlreadyInList };
+
+        // add relationship to database
+        ctx.Buddies.Add(buddy);
+        ctx.SaveChanges();
+
+        // if this is a buddy relationship, use MessagingService to send buddy request message to viking2
+        if (buddyStatus1 == BuddyStatus.PendingApprovalFromOther && buddyStatus2 == BuddyStatus.PendingApprovalFromSelf)
+            messagingService.AddMessageToViking(viking1, viking2, MessageType.Data, MessageTypeID.BuddyList, MessageLevel.WhiteList, "[[Line1]]=[[{{BuddyUserName}} Wants To Add You As A Buddy!]]", "[[Line1]]=[[{{BuddyUserName}} Wants To Add You As A Buddy!]]", "[[Line1]]=[[{{BuddyUserName}} Wants To Add You As A Buddy!]]");
+
+        // return result
+        return new BuddyActionResult
+        {
+            Result = BuddyActionResultType.Success,
+            Status = buddy.BuddyStatus1,
+            BuddyUserID = viking2.Uid.ToString()
+        };
+    }
+
+    public void RemoveBuddy(Viking viking, Guid buddyUid)
+    {
+        // find buddy viking
+        Viking? buddyViking = ctx.Vikings.FirstOrDefault(e => e.Uid == buddyUid);
+
+        if (buddyViking != null)
+        {
+            // find buddy relationship
+            Model.Buddy? buddy = ctx.Buddies.Where(e => e.VikingId == viking.Id)
+                .FirstOrDefault(e => e.BuddyVikingId == buddyViking.Id);
+            
+            if (buddy != null)
+                // remove it
+                ctx.Buddies.Remove(buddy);
+            else throw new InvalidOperationException("Cannot Remove A Buddy That Doesn't Exist");
+
+            ctx.SaveChanges();
+        }
+    }
+
+    public BuddyList ConstructBuddyList(Viking viking)
+    {
+        // get all relationships viking has made
+        List<Model.Buddy> buddies = ctx.Buddies.Where(e => e.BuddyVikingId == viking.Id).ToList();
+        List<Schema.Buddy> schemaBuddies = new();
+        foreach (var buddy in buddies)
+        {
+            // show differently depending on requester
+            if (buddy.VikingId == viking.Id)
+                schemaBuddies.Add(new Schema.Buddy
+                {
+                    UserID = buddy.BuddyViking.Uid.ToString(),
+                    DisplayName = XmlUtil.DeserializeXml<AvatarData>(buddy.BuddyViking.AvatarSerialized).DisplayName,
+                    Status = buddy.BuddyStatus2,
+                    CreateDate = buddy.CreatedAt,
+                    Online = true, // hardcoded until mmo reports precense
+                    OnMobile = false,
+                    BestBuddy = buddy.IsBestFriend2
+                });
+            else
+                schemaBuddies.Add(new Schema.Buddy
+                {
+                    UserID = buddy.Viking.Uid.ToString(),
+                    DisplayName = XmlUtil.DeserializeXml<AvatarData>(buddy.Viking.AvatarSerialized).DisplayName,
+                    Status = buddy.BuddyStatus1,
+                    CreateDate = buddy.CreatedAt,
+                    Online = true, // hardcoded until mmo reports precense
+                    OnMobile = false,
+                    BestBuddy = buddy.IsBestFriend1
+                });
+        }
+
+        // return buddy list
+        return new BuddyList { Buddy = schemaBuddies.ToArray() };
+    }
+}