add list of available aetherytes

Dalamud/Game/ClientState/Aetherytes/AetheryteList.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Dalamud.IoC;
+using Dalamud.IoC.Internal;
+using Serilog;
+
+namespace Dalamud.Game.ClientState.Aetherytes
+{
+    /// <summary>
+    /// This collection represents the list of available Aetherytes in the Teleport window.
+    /// </summary>
+    [PluginInterface]
+    [InterfaceVersion("1.0")]
+    public sealed partial class AetheryteList
+    {
+        private delegate void UpdateAetheryteListDelegate(IntPtr telepo, byte arg1);
+
+        private readonly ClientStateAddressResolver address;
+        private readonly UpdateAetheryteListDelegate updateAetheryteListFunc;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AetheryteList"/> class.
+        /// </summary>
+        /// <param name="addressResolver">Client state address resolver.</param>
+        internal AetheryteList(ClientStateAddressResolver addressResolver)
+        {
+            this.address = addressResolver;
+            this.updateAetheryteListFunc = Marshal.GetDelegateForFunctionPointer<UpdateAetheryteListDelegate>(this.address.UpdateAetheryteList);
+
+            Log.Verbose($"Teleport address 0x{this.address.Telepo.ToInt64():X}");
+        }
+
+        /// <summary>
+        /// Gets the amount of Aetherytes the local player has unlocked.
+        /// </summary>
+        public unsafe int Length
+        {
+            get
+            {
+                var clientState = Service<ClientState>.Get();
+
+                if (clientState.LocalPlayer == null)
+                    return 0;
+
+                this.Update();
+
+                if (TelepoStruct->TeleportList.First == TelepoStruct->TeleportList.Last)
+                    return 0;
+
+                return (int)TelepoStruct->TeleportList.Size();
+            }
+        }
+
+        private unsafe FFXIVClientStructs.FFXIV.Client.Game.UI.Telepo* TelepoStruct => (FFXIVClientStructs.FFXIV.Client.Game.UI.Telepo*)this.address.Telepo;
+
+        /// <summary>
+        /// Gets a Aetheryte Entry at the specified index.
+        /// </summary>
+        /// <param name="index">Index.</param>
+        /// <returns>A <see cref="AetheryteEntry"/> at the specified index.</returns>
+        public unsafe AetheryteEntry? this[int index]
+        {
+            get
+            {
+                if (index < 0 || index >= Length)
+                {
+                    return null;
+                }
+
+                var clientState = Service<ClientState>.Get();
+
+                if (clientState.LocalPlayer == null)
+                    return null;
+
+                return new AetheryteEntry(TelepoStruct->TeleportList.Get((ulong)index));
+            }
+        }
+
+        private void Update()
+        {
+            var clientState = Service<ClientState>.Get();
+
+            // this is very very important as otherwise it crashes
+            if (clientState.LocalPlayer == null)
+                return;
+
+            this.updateAetheryteListFunc(this.address.Telepo, 0);
+        }
+    }
+
+    /// <summary>
+    /// This collection represents the list of available Aetherytes in the Teleport window.
+    /// </summary>
+    public sealed partial class AetheryteList : IReadOnlyCollection<AetheryteEntry>
+    {
+
+        /// <inheritdoc/>
+        public int Count => this.Length;
+
+        /// <inheritdoc/>
+        public IEnumerator<AetheryteEntry> GetEnumerator()
+        {
+            for (var i = 0; i < this.Length; i++)
+            {
+                yield return this[i];
+            }
+        }
+
+        /// <inheritdoc/>
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+    }
+}