Further work on static side

PkmnLib.Static/Libraries/DataLibrary.cs

@@ -0,0 +1,52 @@
+using System.Diagnostics.CodeAnalysis;
+using PkmnLib.Static.Utils;
+
+namespace PkmnLib.Static.Libraries;
+
+/// <summary>
+/// A basic library for data types. Stores data both by name and by index.
+/// </summary>
+public abstract class DataLibrary<T>
+    where T : INamedValue
+{
+    private readonly Dictionary<StringKey, T> _data = new();
+    private readonly List<T> _values = [];
+
+    /// <summary>
+    /// Adds a value to the library.
+    /// </summary>
+    public void Add(T value)
+    {
+        _data.Add(value.Name, value);
+        _values.Add(value);
+    }
+
+    /// <summary>
+    /// Removes a value from the library.
+    /// </summary>
+    public void Remove(T value)
+    {
+        _data.Remove(value.Name);
+        _values.Remove(value);
+    }
+
+    /// <summary>
+    /// Try to get a value from the library. Returns false if the value is not found.
+    /// </summary>
+    public bool TryGet(StringKey key, [MaybeNullWhen(false)] out T value) => _data.TryGetValue(key, out value);
+
+    /// <summary>
+    /// Get a random value from the library.
+    /// </summary>
+    public T GetRandom(IRandom random) => _values[random.GetInt(_values.Count)];
+
+    /// <summary>
+    /// The number of values in the library.
+    /// </summary>
+    public int Count => _values.Count;
+
+    /// <summary>
+    /// Whether the library is empty.
+    /// </summary>
+    public bool IsEmpty => _values.Count == 0;
+}