using System.IO;
using System.Linq;
using System.Net;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.IO;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Trees;
using Umbraco.Extensions;

namespace Umbraco.Cms.Web.BackOffice.Trees
{
    [Tree(Constants.Applications.Settings, "staticFiles", TreeTitle = "Static Files", TreeUse = TreeUse.Dialog)]
    public class StaticFilesTreeController : TreeController
    {
        private readonly IFileSystem _fileSystem;
        private const string AppPlugins = "App_Plugins";
        private const string Webroot = "wwwroot";

        public StaticFilesTreeController(ILocalizedTextService localizedTextService,
            UmbracoApiControllerTypeCollection umbracoApiControllerTypeCollection, IEventAggregator eventAggregator,
            IPhysicalFileSystem fileSystem) :
            base(localizedTextService, umbracoApiControllerTypeCollection, eventAggregator)
        {
            _fileSystem = fileSystem;
        }

        protected override ActionResult<TreeNodeCollection> GetTreeNodes(string id, FormCollection queryStrings)
        {
            var path = string.IsNullOrEmpty(id) == false && id != Constants.System.RootString
                ? WebUtility.UrlDecode(id).TrimStart("/")
                : "";

            var nodes = new TreeNodeCollection();
            var directories = _fileSystem.GetDirectories(path);

            foreach (var directory in directories)
            {
                // We don't want any other directories under the root node other than the ones serving static files - App_Plugins and wwwroot
                if (id == Constants.System.RootString && directory != AppPlugins && directory != Webroot)
                {
                    continue;
                }

                var hasChildren = _fileSystem.GetFiles(directory).Any() || _fileSystem.GetDirectories(directory).Any();

                var name = Path.GetFileName(directory);
                var node = CreateTreeNode(WebUtility.UrlEncode(directory), path, queryStrings, name, "icon-folder", hasChildren);

                if (node != null)
                {
                    nodes.Add(node);
                }
            }

            // Only get the files inside App_Plugins and wwwroot
            var files = _fileSystem.GetFiles(path).Where(x => x.StartsWith(AppPlugins) || x.StartsWith(Webroot));

            foreach (var file in files)
            {
                var name = Path.GetFileName(file);
                var node = CreateTreeNode(WebUtility.UrlEncode(file), path, queryStrings, name, "icon-document", false);

                if (node != null)
                {
                    nodes.Add(node);
                }
            }

            return nodes;
        }

        // We don't have any menu item options (such as create/delete/reload) & only use the root node to load a custom UI
        protected override ActionResult<MenuItemCollection> GetMenuForNode(string id, FormCollection queryStrings) => null;
    }
}