using System.Text;

namespace WhiteMagic;

/// <summary>
/// A pointer-relative view over a <see cref="MemoryBase"/>. Obtained through the
/// high-level facade indexer, it provides read/write/string operations with optional
/// offsets relative to a base address.
/// </summary>
public sealed class RemotePointer
{
    private readonly MemoryBase _memory;

    /// <summary>The base address of this view.</summary>
    public IntPtr BaseAddress { get; }

    internal RemotePointer(MemoryBase memory, IntPtr baseAddress)
    {
        _memory = memory;
        BaseAddress = baseAddress;
    }

    /// <summary>Reads a value of type <typeparamref name="T"/> at <c>BaseAddress + offset</c>.</summary>
    public T Read<T>(nint offset = 0) where T : struct
    {
        return _memory.Read<T>(BaseAddress + offset);
    }

    /// <summary>Writes <paramref name="value"/> at <c>BaseAddress + offset</c>.</summary>
    public bool Write<T>(T value, nint offset = 0) where T : struct
    {
        return _memory.Write(BaseAddress + offset, value);
    }

    /// <summary>Reads a null-terminated string at <c>BaseAddress + offset</c>.</summary>
    public string ReadString(Encoding encoding, int maxLength = 512, nint offset = 0)
    {
        return _memory.ReadString(BaseAddress + offset, encoding, maxLength);
    }

    /// <summary>Writes a null-terminated string at <c>BaseAddress + offset</c>.</summary>
    public bool WriteString(string value, Encoding encoding, nint offset = 0)
    {
        return _memory.WriteString(BaseAddress + offset, value, encoding);
    }


    /// <summary>Returns a new <see cref="RemotePointer"/> with the offset added.</summary>
    public RemotePointer this[nint offset] => new RemotePointer(_memory, BaseAddress + offset);
}