using System;
using System.Collections.Generic;
using System.Text;
using Sunweaver.Commands;
using Sunweaver.VM;
using Sunweaver.Commands.Abstracts;
using Sunweaver.Parsing;
using System.Linq;

namespace Sunweaver.VirtualMachineConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                DNASystem.Initialize();
            }
            catch (Exception Except)
            {
                System.Console.WriteLine("Error initializing: \"" + Except.Message + "\"");
            }

            VirtualMachine VM = new VirtualMachine();

#if false // rough back-of-envelope speed test
            {
                List<BasePair> bps = new List<BasePair>();
                for (int j = 0; j < 10; ++j)
                {
                    for (int i = 0; i < 1000000; ++i)
                    {
                        var bp = DNASystem.CommandListClass.randomBasePair(1, 1, 1, 1);
                        bps.Add(bp);
                    }

                    Codule codule = new Codule(bps);

                    var watch = System.Diagnostics.Stopwatch.StartNew();
                    codule.Execute(VM);
                    float elapsedTicks = (float)watch.ElapsedTicks;
                    System.Console.WriteLine(elapsedTicks);
                    System.Console.WriteLine(System.Diagnostics.Stopwatch.Frequency);
                    System.Console.WriteLine((elapsedTicks / System.Diagnostics.Stopwatch.Frequency * 1000).ToString("0.00"));
                }
            }
#endif

            VM = new VirtualMachine();

            Chromosome dna = new Chromosome();

            System.Console.Write(
                "Welcome to the Sunweaver.VirtualMachineconsole command line.\n" +
                "Enter a blank line to exit.\n");

            string line;
            while ((line = System.Console.ReadLine()) != string.Empty)
            {
                try
                {
                    int lineNumber;
                    var errors = new List<CompilationMessage>();
                    var tokens = Parser.TokenizeAndMetatags(line, dna, errors, out lineNumber);

                    var basePairs = Sunweaver.Parsing.Parser.ParseCodule(tokens, dna, errors);

                    Codule codule = new Codule(basePairs);
                    codule.Execute(VM);

                    System.Console.WriteLine(VM.Stack.ToString());
                }
                catch (Exception Except)
                {
                    System.Console.Write("The previous line failed to execute, \"" +
                        Except.Message + "\"\n");
                }

            }
        }
    }
}