namespace Qrakhen.Qamp.Core.Collections;

/// <summary>
///     Dynamic Pointer able to point to any object implementing the <see cref="IGetSet{long, TValue}"/> interface. 
/// </summary>
public class Pointer<T>
{
    protected IGetSet<long, T> Target;
    public long Ptr;

    public T Current {
        get => Get();
        set => Set(value);
    }

    public Pointer(IGetSet<long, T> target, long pointer = 0)
    {
        Target = target;
        Ptr = pointer;
    }

    public Pointer<T> Branch(long delta = 0)
    {
        return new Pointer<T>(Target, Ptr + delta);
    }

    /// <summary>
    ///     Returns the next item from <see cref="Target"/> and increases the pointer by 1.
    /// </summary>
    public T Next() => Target.Get(Ptr++);

    /// <summary>
    ///     Sets the value of <see cref="Target"/> at <paramref name="position"/>. 
    /// </summary>
    public void Set(long position, T value) => Target.Set(position, value);

    /// <summary>
    ///     Sets the value of <see cref="Target"/> at the current <see cref="Ptr"/> location. 
    /// </summary>
    public void Set(T value) => Set(Ptr, value);

    /// <summary>
    ///     Gets the value of <see cref="Target"/> at <paramref name="position"/>. 
    /// </summary>
    public T Get(long position) => Target.Get(position);

    /// <summary>
    ///     Gets the value of <see cref="Target"/> at the current <see cref="Ptr"/> location. 
    /// </summary>
    public T Get() => Get(Ptr);

    public override string ToString()
    {
        return $"&{Ptr:X4}={Current}";
    }
}