From 5fde9c36cda22eb740f71ff6a7e2614b81efa8a2 Mon Sep 17 00:00:00 2001
From: Rutherther <fandabohacek@gmail.com>
Date: Thu, 27 Jan 2022 14:35:11 +0100
Subject: [PATCH] feat(localbinding): add pet manager binding

---
 .../Objects/PetManagerBinding.cs              | 129 ++++++++++++++++++
 .../Options/PetManagerBindingOptions.cs       |  26 ++++
 2 files changed, 155 insertions(+)
 create mode 100644 Local/NosSmooth.LocalBinding/Objects/PetManagerBinding.cs
 create mode 100644 Local/NosSmooth.LocalBinding/Options/PetManagerBindingOptions.cs

diff --git a/Local/NosSmooth.LocalBinding/Objects/PetManagerBinding.cs b/Local/NosSmooth.LocalBinding/Objects/PetManagerBinding.cs
new file mode 100644
index 0000000..e3a435e
--- /dev/null
+++ b/Local/NosSmooth.LocalBinding/Objects/PetManagerBinding.cs
@@ -0,0 +1,129 @@
+//
+//  PetManagerBinding.cs
+//
+//  Copyright (c) František Boháček. All rights reserved.
+//  Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using NosSmooth.LocalBinding.Options;
+using NosSmooth.LocalBinding.Structs;
+using Reloaded.Hooks.Definitions;
+using Reloaded.Hooks.Definitions.X86;
+using Remora.Results;
+
+namespace NosSmooth.LocalBinding.Objects;
+
+/// <summary>
+/// The binding to NosTale pet manager.
+/// </summary>
+public class PetManagerBinding
+{
+    /// <summary>
+    /// Create nostale pet manager binding.
+    /// </summary>
+    /// <param name="bindingManager">The binding manager.</param>
+    /// <param name="petManagerList">The list of the pet managers.</param>
+    /// <param name="options">The options.</param>
+    /// <returns>A pet manager binding or and error.</returns>
+    public static Result<PetManagerBinding> Create
+        (NosBindingManager bindingManager, PetManagerList petManagerList, PetManagerBindingOptions options)
+    {
+        var petManager = new PetManagerBinding(petManagerList);
+        var hookResult = bindingManager.CreateHookFromPattern<PetWalkDelegate>
+        (
+            "PetManagerBinding.PetWalk",
+            petManager.PetWalkDetour,
+            options.PetWalkPattern,
+            hook: options.HookPetWalk
+        );
+
+        if (!hookResult.IsSuccess)
+        {
+            return Result<PetManagerBinding>.FromError(hookResult);
+        }
+
+        petManager._petWalkHook = hookResult.Entity;
+        return petManager;
+    }
+
+    [Function
+    (
+        new[] { FunctionAttribute.Register.eax, FunctionAttribute.Register.edx, FunctionAttribute.Register.ecx },
+        FunctionAttribute.Register.eax,
+        FunctionAttribute.StackCleanup.Callee
+    )]
+    private delegate bool PetWalkDelegate
+    (
+        IntPtr petManagerPtr,
+        uint position,
+        short unknown0 = 0,
+        int unknown1 = 1,
+        int unknown2 = 1
+    );
+
+    private IHook<PetWalkDelegate> _petWalkHook = null!;
+
+    private PetManagerBinding(PetManagerList petManagerList)
+    {
+        PetManagerList = petManagerList;
+    }
+
+    /// <summary>
+    /// Gets the hook of the pet walk function.
+    /// </summary>
+    public IHook PetWalkHook => _petWalkHook;
+
+    /// <summary>
+    /// Gets pet manager list.
+    /// </summary>
+    public PetManagerList PetManagerList { get; }
+
+    /// <summary>
+    /// Walk the given pet to the given location.
+    /// </summary>
+    /// <param name="selector">Index of the pet to walk. -1 for every pet currently available.</param>
+    /// <param name="x">The x coordinate.</param>
+    /// <param name="y">The y coordinate.</param>
+    /// <returns>A result returned from NosTale or an error.</returns>
+    public Result<bool> PetWalk(int selector, ushort x, ushort y)
+    {
+        uint position = ((uint)y << 16) | x;
+        if (PetManagerList.Length < selector + 1)
+        {
+            return new NotFoundError("Could not find the pet using the given selector.");
+        }
+
+        if (selector == -1)
+        {
+            bool lastResult = true;
+            for (int i = 0; i < PetManagerList.Length; i++)
+            {
+                lastResult = _petWalkHook.OriginalFunction(PetManagerList[i].Address, position);
+            }
+
+            return lastResult;
+        }
+        else
+        {
+            return _petWalkHook.OriginalFunction(PetManagerList[selector].Address, position);
+        }
+    }
+
+    private bool PetWalkDetour
+    (
+        IntPtr petManagerPtr,
+        uint position,
+        short unknown0 = 0,
+        int unknown1 = 1,
+        int unknown2 = 1
+    )
+    {
+        return _petWalkHook.OriginalFunction
+        (
+            petManagerPtr,
+            position,
+            unknown0,
+            unknown1,
+            unknown2
+        );
+    }
+}
\ No newline at end of file
diff --git a/Local/NosSmooth.LocalBinding/Options/PetManagerBindingOptions.cs b/Local/NosSmooth.LocalBinding/Options/PetManagerBindingOptions.cs
new file mode 100644
index 0000000..e63ed5c
--- /dev/null
+++ b/Local/NosSmooth.LocalBinding/Options/PetManagerBindingOptions.cs
@@ -0,0 +1,26 @@
+//
+//  PetManagerBindingOptions.cs
+//
+//  Copyright (c) František Boháček. All rights reserved.
+//  Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using NosSmooth.LocalBinding.Objects;
+
+namespace NosSmooth.LocalBinding.Options;
+
+/// <summary>
+/// Options for <see cref="PetManagerBinding"/>.
+/// </summary>
+public class PetManagerBindingOptions
+{
+    /// <summary>
+    /// Gets or sets the pattern of a pet walk function.
+    /// </summary>
+    public string PetWalkPattern { get; set; }
+        = "55 8b ec 83 c4 e4 53 56 57 8b f9 89 55 fc 8b d8 c6 45 fb 00";
+
+    /// <summary>
+    /// Gets or sets whether to hook the pet walk function.
+    /// </summary>
+    public bool HookPetWalk { get; set; } = true;
+}
\ No newline at end of file
-- 
2.48.1