using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Seshat;
using Seshat.DataDefinitions;
using System.IO;
using System.CodeDom;

namespace SchemaCodeGenerator
{
    class Program
    {
        static void BuildSchema(string file)
        {
            if (!File.Exists(file))
            {
                throw new FileNotFoundException(System.Reflection.Assembly.GetEntryAssembly().FullName +
                    ": error : Could not find schema file " + file);
            }

            Seshat.DataDefinitions.SchemaDefinition schema;

            using (StreamReader schemaFile = new StreamReader(file))
            {
                schema = Seshat.LuaDefinitions.LuaExecutor.RunScriptExtractSchema(
                    schemaFile.ReadToEnd(), file);
            }

            CodeNamespace codeNamespace = CodeGenerator.BuildCodeNamespace(schema);
            string output = CodeGenerator.BuildCSFileText(codeNamespace);

            var outFileName = System.IO.Path.Combine(
                Path.GetDirectoryName(file),
                Path.GetFileNameWithoutExtension(file) + ".cs"
            );

            using (StreamWriter outfile = new StreamWriter(outFileName))
            {
                outfile.Write(output);
                outfile.Flush();
            }

            Console.WriteLine(file + " -> " + outFileName);
        }

        static int Main(string[] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine(System.Reflection.Assembly.GetEntryAssembly().FullName +
                    ": error : Should have one or more schema files.");
                return 1;
            }

            int failCount = 0;
            Console.WriteLine("Starting code generation...");
            foreach (var file in args)
            {
                try
                {
                    BuildSchema(file);
                }
                catch (Exception exc)
                {
                    var iteratingException = exc;
                    do
                    {
                        Console.WriteLine(UnitTestSharp.BuildMessages.UnexpectedExceptionMessage(
                            "Error during schema building", "", iteratingException));
                        iteratingException = iteratingException.InnerException;
                    }
                    while (iteratingException != null);
                    ++failCount;
                }
            }

            Console.WriteLine("Code generation finished.");
            return failCount;
        }
    }
}