using System.ComponentModel;
using System.Text;

namespace Qrakhen.Qamp.Memory;

public sealed class LineBuffer : TailBuffer<byte>, INotifyPropertyChanged
{
    public Encoding Encoding { get; }
    public string Cached { get; private set; } = "";
    public event PropertyChangedEventHandler? PropertyChanged;

    public LineBuffer(Encoding encoding, int size = 0x80) : base(size)
    {
        Encoding = encoding;
    }

    public LineBuffer(string data) : this(data, Encoding.ASCII) { }
    public LineBuffer(string data, Encoding encoding) : base(encoding.GetBytes(data))
    {
        Encoding = encoding;
        Cached = ToString();
    }

    protected override void SetTail(int tail = -1)
    {
        base.SetTail(tail);
        Cached = ToString();
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Cached)));
    }

    public void Insert(int cursor, string data)
        => Insert(cursor, Encoding.GetBytes(data));

    public override string ToString()
    {
        if (Tail == 0 || Encoding == null)
            return string.Empty;
        return Encoding.GetString(Data, 0, Tail);
    }

    public static implicit operator LineBuffer(string s) => new LineBuffer(s);
}