// /**
//  * File: ElementReader.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Collections.Generic;
namespace ln.templates.html
{
    public class ElementReader : HtmlReader
    {
        Stack<Element> elements = new Stack<Element>();

        public Element CurrentElement => elements.Peek();
        public virtual DocumentElement Document { get; }

        public ElementReader()
        {
            Document = CreateDocument();
            elements.Push(Document);
        }

        public virtual DocumentElement CreateDocument() => new DocumentElement();

        public virtual Element CreateElement(string tagName)
        {
            switch (tagName.ToUpper())
            {
                default:
                    return new Element(tagName);
            }
        }
        public virtual Element CreateTextElement(string text) => new TextElement(text);

        void Push(Element element)
        {
            if (CurrentElement.IsVoid)
                elements.Pop();

            CurrentElement.AppendChild(element);
            elements.Push(element);
        }

        void Pop()
        {
            if (CurrentElement.IsVoid)
                elements.Pop();

            elements.Pop();
        }

        public override void OpenTag(string tagName)
        {
            Push(CreateElement(tagName));
        }
        public override void CloseTag(string tagName)
        {
            Pop();
        }
        public override void Attribute(string attributeName, string attributeValue)
        {
            CurrentElement.SetAttribute(attributeName, attributeValue);
        }
        public override void Text(string text)
        {
            CurrentElement.AppendChild(
                CreateTextElement(text)
            );
        }
    }
}