From 13608f340e507f8c6f3656f60dfbf6f372c0c62e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Franti=C5=A1ek=20Boh=C3=A1=C4=8Dek?=
 <fandabohacek@gmail.com>
Date: Thu, 23 Dec 2021 16:05:13 +0100
Subject: [PATCH] feat: add hook manager for walk function

---
 .../Hooks/NostaleHookManager.cs               | 74 +++++++++++++++++++
 .../Hooks/WalkEventArgs.cs                    | 34 +++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 Local/NosSmooth.LocalClient/Hooks/NostaleHookManager.cs
 create mode 100644 Local/NosSmooth.LocalClient/Hooks/WalkEventArgs.cs

diff --git a/Local/NosSmooth.LocalClient/Hooks/NostaleHookManager.cs b/Local/NosSmooth.LocalClient/Hooks/NostaleHookManager.cs
new file mode 100644
index 0000000..d84d938
--- /dev/null
+++ b/Local/NosSmooth.LocalClient/Hooks/NostaleHookManager.cs
@@ -0,0 +1,74 @@
+//
+//  NostaleHookManager.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 System.ComponentModel;
+using NosSmoothCore;
+using Remora.Results;
+
+namespace NosSmooth.LocalClient.Hooks;
+
+/// <summary>
+/// The manager for hooking functions.
+/// </summary>
+public class NostaleHookManager
+{
+    private readonly NosClient _nosClient;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="NostaleHookManager"/> class.
+    /// </summary>
+    /// <param name="nosClient">The nostale client.</param>
+    public NostaleHookManager(NosClient nosClient)
+    {
+        _nosClient = nosClient;
+    }
+
+    /// <summary>
+    /// Event for the character walk function.
+    /// </summary>
+    public event Func<WalkEventArgs, bool>? ClientWalked;
+
+    /// <summary>
+    /// Hook the Character.Walk function.
+    /// </summary>
+    /// <returns>A result that may or may not have succeeded.</returns>
+    public Result HookCharacterWalk()
+    {
+        try
+        {
+            _nosClient.GetCharacter().SetWalkCallback(Walk);
+        }
+        catch (Exception e)
+        {
+            return e;
+        }
+
+        return Result.FromSuccess();
+    }
+
+    /// <summary>
+    /// Reset the registered hooks.
+    /// </summary>
+    /// <returns>A result that may or may not have succeeded.</returns>
+    public Result ResetHooks()
+    {
+        try
+        {
+            _nosClient.ResetHooks();
+        }
+        catch (Exception e)
+        {
+            return e;
+        }
+
+        return Result.FromSuccess();
+    }
+
+    private bool Walk(int position)
+    {
+        return ClientWalked?.Invoke(new WalkEventArgs(position & 0xFFFF, (int)((position & 0xFFFF0000) >> 16))) ?? true;
+    }
+}
\ No newline at end of file
diff --git a/Local/NosSmooth.LocalClient/Hooks/WalkEventArgs.cs b/Local/NosSmooth.LocalClient/Hooks/WalkEventArgs.cs
new file mode 100644
index 0000000..9563909
--- /dev/null
+++ b/Local/NosSmooth.LocalClient/Hooks/WalkEventArgs.cs
@@ -0,0 +1,34 @@
+//
+//  WalkEventArgs.cs
+//
+//  Copyright (c) František Boháček. All rights reserved.
+//  Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace NosSmooth.LocalClient.Hooks;
+
+/// <summary>
+/// The event args for event in <see cref="NostaleHookManager"/>.
+/// </summary>
+public class WalkEventArgs
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WalkEventArgs"/> class.
+    /// </summary>
+    /// <param name="targetX">The target x coordinate.</param>
+    /// <param name="targetY">The target y coordinate.</param>
+    public WalkEventArgs(int targetX, int targetY)
+    {
+        TargetX = targetX;
+        TargetY = targetY;
+    }
+
+    /// <summary>
+    /// Gets the target x coordinate.
+    /// </summary>
+    public int TargetX { get; }
+
+    /// <summary>
+    /// Gets the target y coordinate.
+    /// </summary>
+    public int TargetY { get; }
+}
\ No newline at end of file
-- 
2.49.0