using System;
using System.Collections.Generic;
using Upsilon;
using Upsilon.Binder;
using Upsilon.Evaluator;

namespace Yc
{
    static class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Upsilon REPL");
            Dictionary<VariableSymbol, object> variables = new Dictionary<VariableSymbol, object>();
            while (true)
            {
                Console.Write("» ");
                var input = Console.ReadLine();
                if (input == "exit")
                {
                    return;
                }

                var parsed = new Script(input, variables);
                if (parsed.Diagnostics.Messages.Count > 0)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Errors were found during parsing");
                    foreach (var diagnosticsMessage in parsed.Diagnostics.Messages)
                    {
                        LogError(diagnosticsMessage);
                    }
                    Console.ResetColor();
                    continue;
                }

                var evaluate = parsed.Evaluate();
                if (parsed.Diagnostics.Messages.Count > 0)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Errors were found during evaluating");
                    foreach (var diagnosticsMessage in parsed.Diagnostics.Messages)
                    {
                        LogError(diagnosticsMessage);
                    }
                    Console.ResetColor();
                }
                else
                {
                    Console.WriteLine(evaluate);
                    //variables = parsed.Variables;
                }
            }
        }

        public static void LogError(DiagnosticsMessage message)
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine(message.Message);

            Console.ForegroundColor = ConsoleColor.Gray;
            Console.Write(message.BeforeError());

            Console.ForegroundColor = ConsoleColor.Red;
            Console.Write(message.AtError());

            Console.ForegroundColor = ConsoleColor.Gray;
            Console.Write(message.AfterError());
            Console.WriteLine();
        }
    }
}