// -----------------------------------------------------------------------------
// file="TestRegexGenerate"
// Project: StgSharp
// Copyright (c) Nitload.
// SPDX-License-Identifier: MIT
// -----------------------------------------------------------------------------

using Nitload.RegularAnalysis.Abstraction;
using Nitload.RegularAnalysis.Text;
using System;
using System.Collections.Generic;
using System.Runtime.ExceptionServices;
using static Nitload.RegularAnalysis.Text.TextRegexSourceGen;

namespace Nitload
{
    internal static class TestRegexGenerate
    {

        public static int Run(
                          string arg
        )
        {
            Console.WriteLine($"Text regex to be tested: {arg} :\n\n\n");
            Print(arg);
            return 0;
        }

        private static void Print(
                            string pattern
        )
        {
            TextRegexSource analysis = RegexAnalyzer.Analyze(pattern);
            if (analysis.AnalyseException is not null) {
                ExceptionDispatchInfo.Throw(analysis.AnalyseException);
            }

            SequenceEmitter<string> body = new();
            List<SequenceEmitter<string>> functions = [];
            SourceGenContext context = new();
            ExitLabel local_fail = context.RequestExitLabel(ExitKind.MatchFailed);
            ExitLabel backtrack = local_fail;
            ExitLabel end = context.RequestExitLabel(ExitKind.MatchEnd);
            GenerateMethodSource(analysis.Ast.Root, body, functions, context, local_fail, ref backtrack);
            _ = body.AppendLine($"goto {end.GetLabelName()};")
                    .AppendLine($"{local_fail.GetLabelName()}: {{}}")
                    .AppendLine("// TODO(NGRA): Produce the root failure result here.")
                    .AppendLine($"{end.GetLabelName()}: {{}}");

            foreach (string line in body.ToList()) {
                Console.WriteLine(line);
            }
            foreach (SequenceEmitter<string> function in functions)
            {
                foreach (string line in function.ToList()) {
                    Console.WriteLine(line);
                }
            }
        }

    }
}