Parse exchange field for Item Definitions, giving Recipe

Facepunch.Steamworks.Test/Client/Client.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
 namespace Facepunch.Steamworks.Test
@@ -221,6 +222,50 @@ public void InventoryDefinitions()
             }            
         }
 
+        [TestMethod]
+        public void InventoryDefinitionExchange()
+        {
+            using ( var client = new Facepunch.Steamworks.Client( 252490 ) )
+            {
+                Assert.IsNotNull( client.Inventory.Definitions );
+                Assert.AreNotEqual( 0, client.Inventory.Definitions.Length );
+
+                foreach ( var i in client.Inventory.Definitions )
+                {
+                    if ( i.Recipes == null ) continue;
+
+                    Console.WriteLine( "Ways To Create " + i.Name );
+
+                    foreach ( var r in i.Recipes )
+                    {
+                        Console.WriteLine( "  " + string.Join( ", ",  r.Ingredients.Select( x => x.Count + " x " + x.Definition.Name  ) ) );
+                    }
+                }
+            }
+        }
+
+        [TestMethod]
+        public void InventoryDefinitionIngredients()
+        {
+            using ( var client = new Facepunch.Steamworks.Client( 252490 ) )
+            {
+                Assert.IsNotNull( client.Inventory.Definitions );
+                Assert.AreNotEqual( 0, client.Inventory.Definitions.Length );
+
+                foreach ( var i in client.Inventory.Definitions )
+                {
+                    if ( i.IngredientFor == null ) continue;
+
+                    Console.WriteLine( i.Name + " Can Be Used to Make" );
+
+                    foreach ( var r in i.IngredientFor )
+                    {
+                        Console.WriteLine( "  " + r.Result.Name );
+                    }
+                }
+            }
+        }
+
         [TestMethod]
         public void InventoryItemList()
         {

Facepunch.Steamworks/Interfaces/Inventory.Definition.cs

@@ -18,11 +18,27 @@ public class Definition
             internal SteamNative.SteamInventory inventory;
 
             public int Id { get; private set; }
-            public string Name;
-            public string Description;
+            public string Name { get; set; }
+            public string Description { get; set; }
 
-            public DateTime Created;
-            public DateTime Modified;
+            /// <summary>
+            /// If this item can be created using other items this string will contain a comma seperated 
+            /// list of definition ids that can be used, ie "100,101;102x5;103x3,104x3"
+            /// </summary>
+            public string ExchangeSchema { get; set; }
+
+            /// <summary>
+            /// A list of recepies for creating this item. Can be null if none.
+            /// </summary>
+            public Recipe[] Recipes { get; set; }
+
+            /// <summary>
+            /// A list of recepies we're included in
+            /// </summary>
+            public Recipe[] IngredientFor { get; set; }
+
+            public DateTime Created { get; set; }
+            public DateTime Modified { get; set; }
 
             private Dictionary<string, string> customProperties;
 
@@ -86,6 +102,7 @@ internal void SetupCommonProperties()
                 Description = GetStringProperty( "description" );
                 Created = GetProperty<DateTime>( "timestamp" );
                 Modified = GetProperty<DateTime>( "modified" );
+                ExchangeSchema = GetStringProperty( "exchange" );
             }
 
             /// <summary>
@@ -100,6 +117,78 @@ public void TriggerItemDrop()
                 inventory.TriggerItemDrop( ref result, Id );
                 inventory.DestroyResult( result );
             }
+
+            internal void Link( Definition[] definitions )
+            {
+                LinkExchange( definitions );
+            }
+
+            private void LinkExchange( Definition[] definitions )
+            {
+                if ( string.IsNullOrEmpty( ExchangeSchema ) ) return;
+
+                var parts = ExchangeSchema.Split( new[] { ';' }, StringSplitOptions.RemoveEmptyEntries );
+
+                Recipes = parts.Select( x => Recipe.FromString( x, definitions, this ) ).ToArray();
+            }
+
+            internal void InRecipe( Recipe r )
+            {
+                if ( IngredientFor == null )
+                    IngredientFor = new Recipe[0];
+
+                var list = new List<Recipe>( IngredientFor );
+                list.Add( r );
+
+                IngredientFor = list.ToArray();
+            }
+        }
+
+        public struct Recipe
+        {
+            public struct Ingredient
+            {
+                public int DefinitionId;
+                public Definition Definition;
+                public int Count;
+
+                internal static Ingredient FromString( string part, Definition[] definitions )
+                {
+                    var i = new Ingredient();
+                    i.Count = 1;
+
+                    if ( part.Contains( 'x' ) )
+                    {
+                        var idx = part.IndexOf( 'x' );
+                        i.Count = int.Parse( part.Substring( idx ) );
+                        part = part.Substring( 0, idx );
+                    }
+
+                    i.DefinitionId = int.Parse( part );
+                    i.Definition = definitions.FirstOrDefault( x => x.Id == i.DefinitionId );
+
+                    return i;
+                }
+            }
+
+            public Definition Result;
+            public Ingredient[] Ingredients;
+
+            internal static Recipe FromString( string part, Definition[] definitions, Definition Result )
+            {
+                var r = new Recipe();
+                r.Result = Result;
+                var parts = part.Split( new[] { ',' }, StringSplitOptions.RemoveEmptyEntries );
+
+                r.Ingredients = parts.Select( x => Ingredient.FromString( x, definitions ) ).ToArray();
+
+                foreach ( var i in r.Ingredients )
+                {
+                    i.Definition.InRecipe( r );
+                }
+
+                return r;
+            }
         }
     }
 }

Facepunch.Steamworks/Interfaces/Inventory.cs

@@ -118,6 +118,11 @@ internal void FetchItemDefinitions()
                 return CreateDefinition( x );
 
             } ).ToArray();
+
+            foreach ( var def in Definitions )
+            {
+                def.Link( Definitions );
+            }
         }
 
         /// <summary>