using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
using System.Reflection;

using System.IO;

namespace ReflectorS
{
    public class Serializer
    {
        public int IndentSpaceCount { get; set; } = 2;
        public bool TreatStringAsEnumerable { get; set; } = false;


        public void Serialize(TextWriter writer, object graph)
        {
            InnerSerialize(writer, graph.GetType().Name, graph, 0);
        }

        private void InnerSerialize(TextWriter writer, string objectName, object graph, int IndentLevel)
        {
            if (graph.GetType().IsPrimitive || graph is String)
            {
                SerializePrimitiveProperty(writer, objectName, graph, IndentLevel);
            }

            else if (graph is IEnumerable)
            {
                SerializeIEnumerable(writer, objectName, graph as IEnumerable, IndentLevel);
            }

            else
            {
                string IndentSpaces = new String(' ', IndentLevel * IndentSpaceCount);
                writer.WriteLine(IndentSpaces + "<{0}>", objectName);
                SerializeObject(writer, graph, IndentLevel + 1);
                writer.WriteLine(IndentSpaces + "</{0}>", objectName);

            }


        }

        private void SerializePrimitiveProperty(TextWriter writer, string propertyName, object property, int IndentLevel)
        {
            string IndentSpaces = new String(' ', IndentLevel * IndentSpaceCount);

            writer.Write(IndentSpaces + "<{0}>", propertyName);
            writer.Write(property); // is primitive so we can safely print it
            writer.WriteLine("</{0}>", propertyName);

        }

        private void SerializeString (TextWriter writer, string StringName, string text, int IndentLevel)
        {
            if (!TreatStringAsEnumerable)
            {
                SerializePrimitiveProperty(writer, StringName, text, IndentLevel);
            }
            else
            {
                ; // todo as enum
            }
        }

        private void SerializeIEnumerable(TextWriter writer, string IEnumerableName, IEnumerable enumerable, int IndentLevel)
        {
            foreach (Object obj in enumerable)
            {
                InnerSerialize(writer, obj.GetType().Name, obj, IndentLevel + 1);
            }

        }

        private void SerializeObject(TextWriter writer, object graph, int IndentLevel)
        {
            string IndentSpaces = new String(' ', IndentLevel * IndentSpaceCount);
            writer.WriteLine(IndentSpaces + "<{0}>", graph.GetType().Name);


            foreach (var property in graph.GetType().GetProperties())
            {
                var PropertyObject = (Object)property.GetValue(graph);

                {
                    InnerSerialize(writer, property.Name, PropertyObject, IndentLevel + 1);
                }
            }

            writer.WriteLine(IndentSpaces + "</{0}>", graph.GetType().Name);




        }


    }
}