namespace VarsetLib;

public class VarsetParser
{
    public static List<VarsetItem> Parse(string path)
    {
        FileStream fs = new FileStream(path, FileMode.Open);
        
        var reader = new StreamReader(fs);
        
        List<VarsetItem> varsetItems = [];
        
        var lineIndex = 1;
        while (!reader.EndOfStream)
        {
            var line = reader.ReadLine()!;
            if (line.Length == 0)
            {
                lineIndex++;
                continue;
            }
        
            if (line.StartsWith("//") || line.Trim().StartsWith("//"))
            {
                lineIndex++;
                continue;
            }
        
            if (!line.StartsWith("VAR"))
            {
                Console.WriteLine($"Error on line: {lineIndex}! Not starting with VAR");
                lineIndex++;
                continue;
            }
        
            var openParenthesisIndex = line.IndexOf("(");
            var closeParenthesisIndex = line.IndexOf(")");
        
            if (openParenthesisIndex == -1 || closeParenthesisIndex == -1 || closeParenthesisIndex <= openParenthesisIndex)
            {
                Console.WriteLine($"Error on line: {lineIndex}! VAR() format invalid");
                lineIndex++;
                continue;
            }
        
            var arguments = line.Substring(openParenthesisIndex + 1, closeParenthesisIndex - openParenthesisIndex - 1);
        
            var parts = arguments.Trim()
                .Split(',');
        
            var type = parts[0]
                .Trim();
        
            var name = parts[1]
                .Trim();
        
            var value = parts[2]
                .Trim();
        
            var item = new VarsetItem(type, name, value);
            varsetItems.Add(item);
            
            lineIndex++;
        }

        return varsetItems;
    }
}