using Bridge.Html5;
using FrontendRouting;
using System;
using System.Collections.Generic;
using System.Linq;

namespace LearnBridgeNet.Components
{
    public class NavigateBar : IDisposable
    {
        private static readonly string AttrReplace = typeof(NavigateBar).FullName + "_action_replace";

        private readonly Dictionary<string, HTMLAnchorElement> _subElements = new Dictionary<string, HTMLAnchorElement>();
        private Dictionary<string, NavigateBarItem> _items;
        public HTMLElement Element { get; }

        public bool Hidden { get => Element.Hidden; set => Element.Hidden = value; }

        public NavigateBar(Node parent)
        {
            Element = new HTMLDivElement
            {
                ClassName = "navbar"
            };
            parent.AppendChild(Element);

            FeRoutingManager.Navigated += FeRouting_Navigated;
        }

        private void FeRouting_Navigated(object sender, EventArgs e)
        {
            foreach (var element in _subElements.Values)
            {
                element.Style.FontWeight = element.GetAttribute("href") == Window.Location.PathName
                    ? "bold"
                    : "";
            }
        }

        private static HTMLAnchorElement Create(string href, NavigateBarItem item)
        {
            var element = new HTMLAnchorElement { TextContent = item.Name, Href = href };
            element.SetAttribute(AttrReplace, item.Replace.ToString());
            element.AddEventListener(EventType.Click, evt =>
            {
                evt.PreventDefault();
                FeRoutingManager.Go(href,element.GetAttribute(AttrReplace)=="True");
            });
            return element;
        }

        public Dictionary<string, NavigateBarItem> Items
        {
            get => _items.ToDictionary(p => p.Key, p => p.Value);
            set
            {
                if (null == Items)
                {
                    foreach (var element in _subElements.Values)
                    {
                        element.Remove();
                    }
                    _subElements.Clear();
                    return;
                }

                _items = value.ToDictionary(p => p.Key, p => p.Value);

                foreach (var item in _items)
                {
                    if (_subElements.TryGetValue(item.Key, out var element))
                    {
                        element.TextContent = item.Value.Name;
                        element.SetAttribute(AttrReplace, item.Value.Replace.ToString());
                    }
                    else Element.AppendChild(_subElements[item.Key] = Create(item.Key, item.Value));
                }

                foreach (var key in _subElements.Keys.Where(p => false == _items.ContainsKey(p)).ToArray())
                {
                    _subElements[key].Remove();
                    _subElements.Remove(key);
                }
                FeRouting_Navigated(null, null);
            }
        }

        public void Dispose()
        {
            FeRoutingManager.Navigated -= FeRouting_Navigated;
            Element.Remove();
        }
    }
}