using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks;

namespace FirstVillain.ClassBuild
{
    public class ClassBuilder
    {
        private string _className;
        private CodeCompileUnit targetUnit;
        private CodeTypeDeclaration targetClass;

        public ClassBuilder(string className)
        {
            _className = className;
            targetUnit = new CodeCompileUnit();
            CodeNamespace namespaceTarget = new CodeNamespace("FirstVillain.Entities");
            //namespaceTarget.Imports.Add(new CodeNamespaceImport("System"));       //import도 가능...리스트 넣으면 추가해야함.

            targetClass = new CodeTypeDeclaration(_className);
            targetClass.IsClass = true;
            targetClass.TypeAttributes = TypeAttributes.Public | TypeAttributes.Serializable;
            namespaceTarget.Types.Add(targetClass);
            targetUnit.Namespaces.Add(namespaceTarget);
        }
        public void CreateCode(Dictionary<string, Type> map, string path)
        {
            foreach (var typeData in map)
            {
                AddField(typeData.Key, typeData.Value);
            }

            GenerateCSharpCode(path);
        }

        private void GenerateCSharpCode(string path)
        {
            string fileName = Path.Combine(path, _className + ".cs");
            if (File.Exists(fileName))
            {
                File.Delete(fileName);
            }
            CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
            CodeGeneratorOptions options = new CodeGeneratorOptions();
            options.BracingStyle = "C";
            using (StreamWriter sourceWriter = new StreamWriter(fileName))
            {
                provider.GenerateCodeFromCompileUnit(
                    targetUnit, sourceWriter, options);
            }
        }

        private void AddField(string name, Type type)
        {
            // Declare the widthValue field.
            CodeMemberField fieldValue = new CodeMemberField();
            fieldValue.Attributes = MemberAttributes.Public;
            fieldValue.Name = name;
            fieldValue.Type = new CodeTypeReference(type);
            //widthValueField.Comments.Add(new CodeCommentStatement(
            //    "The width of the object."));
            targetClass.Members.Add(fieldValue);
        }
    }
}