using System.Text.RegularExpressions;

namespace MycroForge.Core.CodeGen;

public class Source
{
    private string _text;
    public string Text => _text;

    public Source(string text)
    {
        _text = text;
    }

    public SourceMatch Find(string pattern)
    {
        var regex = new Regex(pattern);
        var match = regex.Match(_text);
        if (match.Value.Length == 0)
            throw new Exception($"No match found for pattern: {pattern}");
        return new SourceMatch(match.Index, match.Value);
    }

    public List<SourceMatch> FindAll(string pattern)
    {
        var regex = new Regex(pattern);
        var matches = regex.Matches(_text);
        return matches.Select(m => new SourceMatch(m.Index, m.Value)).ToList();
    }

    public Source InsertSingleLine(int index, string text)
    {
        _text = _text.Insert(index, string.Join('\n', text));
        return this;
    }

    public Source InsertMultiLine(int index, params string[] text)
    {
        _text = _text.Insert(index, string.Join('\n', text));
        return this;
    }

    public Source InsertMultiLineAtStart(params string[] text)
    {
        _text =  string.Join('\n', text) + _text;
        return this;
    }

    public Source InsertMultiLineAtEnd(params string[] text)
    {
        _text += string.Join('\n', text);
        return this;
    }

    public Source Replace(SourceMatch match, string text)
    {
        _text = _text.Remove(match.StartIndex, match.Text.Length);
        _text = _text.Insert(match.StartIndex, text);
        return this;
    }
}