using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using MediaDevices;
using Mtp2Dav.WebDAVSharp.Server._1d2086a502937936ebc6bfe19cfa15d855be1c31.Stores;

namespace Mtp2Dav.MtpStore._1d2086a502937936ebc6bfe19cfa15d855be1c31
{
    [DebuggerDisplay("Mtp Store ({_device})")]
    internal class WebDavMtpStore : IWebDavStore
    {
        public WebDavMtpStore(MediaDevice device, bool enableRo)
        {
            if (device == null)
                throw new ArgumentNullException(nameof(device));

            _device = device;
            _enableRo = enableRo;
        }

        private readonly MediaDevice _device;
        private readonly bool _enableRo;

        private readonly Dictionary<string, WebDavMtpStoreItem[]> _dirCache = new Dictionary<string, WebDavMtpStoreItem[]>();
        private readonly Dictionary<string, MediaFileInfo> _fileCache = new Dictionary<string, MediaFileInfo>();

        //For WebDAVSharp.Server
        public WebDavMtpStoreCollection Root
        {
            get
            {
                //HACK:
                var rootEntries = GetEntries("\\");
                if (rootEntries.Length == 1 && rootEntries[0].IsCollection)
                    return new WebDavMtpStoreCollection(this, rootEntries[0].ItemPath);

                return new WebDavMtpStoreCollection(this, "\\");
            }
        }

        IWebDavStoreCollection IWebDavStore.Root => Root;

        //My opti
        public WebDavMtpStoreItem[] GetEntries(string path, bool useCache = true)
        {
#if !DEBUG
            if (_dirCache.ContainsKey(path) && useCache) return _dirCache[path];
#endif
            var entries = new List<WebDavMtpStoreItem>();
            entries.AddRange(_device.EnumerateDirectories(path).Select(p => new WebDavMtpStoreCollection(this, path + p + "\\")));
            entries.AddRange(_device.EnumerateFiles(path).Select(p => new WebDavMtpStoreDocument(this, path + p)));
            return _dirCache[path] = entries.ToArray();
        }

        public MediaFileInfo GetInfo(string path, bool useCache = true)
        {
#if !DEBUG
            if (_fileCache.ContainsKey(path) && useCache) return _fileCache[path];
#endif
            try
            {
                return _fileCache[path] = _device.GetFileInfo(path);
            }
            catch (Exception ex)
            {
                Debug.Print(ex.ToString());
                return _fileCache[path] = null;
            }
        }

        public void FullBuf()
        {
            BufDir("\\");
        }

        private void BufDir(string path)
        {
            Console.WriteLine($"bufing - dir - {path}");
            foreach (var item in GetEntries(path))
            {
                if (item.IsCollection) BufDir(item.ItemPath);
                else
                {
                    Console.WriteLine($"bufing - file - {item.ItemPath}");
                    GetInfo(path);
                }
            }
        }

        public Stream OpenReadStream(string path)
        {
            if (!_enableRo)
                throw new NotSupportedException();

            var ms = new MemoryStream();
            _device.DownloadFile(path, ms);
            ms.Position = 0;
            return ms;
        }
    }
}