using Irony.Interpreter;
using Irony.Parsing;
using Xunit.Sdk;

namespace test.core;

public class GrammarTester
{
    private Grammar grammar;
    private LanguageData language;
    private Parser parser;

    public GrammarTester(Grammar grammar)
    {
         this.grammar = grammar;

         language = new LanguageData(grammar);

         parser = new Parser(language);
    }

    public Exception LastException { get; private set; }
    public AppStatus Status { get; private set; }
    public ParseTree LastScript { get; private set; }

    public object Parse(string script)
    {
        try
        {
            var parsedScript = parser.Parse(script);
            if (parsedScript.HasErrors())
            {
                Status = AppStatus.SyntaxError;
                var ex = new ScriptException("Syntax errors found: "
                + string.Join(", ", parsedScript.ParserMessages.Select(m => $"{m.Message} at line {m.Location.Line}, column {m.Location.Column}" )));
                ex.Location = parsedScript.ParserMessages.First().Location;
                throw ex;
            }

            if (parser.Context.Status == ParserStatus.AcceptedPartial)
            {
                throw new Exception("AcceptedPartial");
            }
            LastScript = parsedScript;
            return parsedScript;
        }
        catch (Exception ex)
        {
            this.LastException = ex;
            this.Status = AppStatus.Crash;
            throw;
        }
    }
}