using System.Globalization;

namespace MoniteurBaie.Utils;

public class Splitter
{
    const char DELIMITER = ',';

    public delegate T ValueReader<T>(ReadOnlySpan<char> s);

    private readonly string _str;
    private int _pos = 0, _charCount = 0, _nextPos = 0;

    public Splitter(string str) => _str = str;

    public bool MoveNext()
    {
        _pos = _nextPos;
        var i = _str.IndexOf(DELIMITER, _pos);
        (_charCount, _nextPos) = i < 0 ? (_str.Length - _pos, _str.Length) : (i - _pos, i + 1);

        return HasNext;
    }

    public bool HasNext => _pos < _str.Length;

    public T Read<T>(ValueReader<T> reader) => MoveNext() ? reader(_str.AsSpan(_pos, _charCount)) : throw new InvalidOperationException();

    public string? ReadString() => Read(static s => new string(s));

    public bool ReadBool() => Read(static s => s.Length == 1 ? s[0] switch { '0' => false, '1' => true, _ => throw new InvalidDataException() } : throw new InvalidDataException());

    public int ReadInt() => Read(static s => int.Parse(s, provider: CultureInfo.InvariantCulture));

    public uint ReadUInt() => Read(static s => uint.Parse(s, provider: CultureInfo.InvariantCulture));

    public float ReadFloat() => Read(static s => float.Parse(s, provider: CultureInfo.InvariantCulture));
}