using System;

using System.Collections.Generic;

using System.Configuration;

using System.IO;

using System.Linq;

using System.Web.Hosting;

using Amazon.S3.Util;

using Orchard.Environment.Configuration;

using Orchard.Localization;

using Orchard.Validation;

using Orchard.FileSystems.Media;

using Amazon.S3.Model;

using Werul.S3StorageProvider.Models;

using Orchard.Environment.Extensions;

using Amazon.S3;

using Orchard;

using Orchard.ContentManagement;



namespace Werul.S3StorageProvider.Providers {

    [OrchardSuppressDependency("Orchard.FileSystems.Media.FileSystemStorageProvider")]

    public class S3StorageProvider : IStorageProvider {



        private readonly AmazonS3Config _S3Config;

        private readonly IOrchardServices Services;        



        public S3StorageProvider(IOrchardServices services)

        {

            Services = services;

            _S3Config = new AmazonS3Config()

            {

                ServiceURL = "s3.amazonaws.com",

                CommunicationProtocol = Amazon.S3.Model.Protocol.HTTP,

            };



            T = NullLocalizer.Instance;

        }



        public string PublicPath

        {

            get

            {

                return string.Format("https://{0}.s3.amazonaws.com/", BucketName);

            }

        }

        public string AWSAccessKey

        {

            get

            {

                return Services.WorkContext.CurrentSite.As<S3StorageProviderSettingsPart>().Record.AWSAccessKey;

            }

        }

        public string AWSSecretKey

        {

            get

            {

                return Services.WorkContext.CurrentSite.As<S3StorageProviderSettingsPart>().Record.AWSSecretKey;

            }

        }

        public string BucketName

        {

            get

            {

                return Services.WorkContext.CurrentSite.As<S3StorageProviderSettingsPart>().Record.BucketName;

            }

        }



        public Localizer T { get; set; }



        /// <summary>

        /// Retrieves the public URL for a given file within the storage provider.

        /// </summary>

        /// <param name="path">The relative path within the storage provider.</param>

        /// <returns>The public URL.</returns>

        public string GetPublicUrl(string path)

        {

            return string.IsNullOrEmpty(path) ? PublicPath : Path.Combine(PublicPath, path).Replace(Path.DirectorySeparatorChar, '/');

        }



        /// <summary>

        /// Retrieves a file within the storage provider.

        /// </summary>

        /// <param name="path">The relative path to the file within the storage provider.</param>

        /// <returns>The file.</returns>

        /// <exception cref="ArgumentException">If the file is not found.</exception>

        public IStorageFile GetFile(string path)

        {

            //not sure if we should use a temp directory here or what

            throw new NotImplementedException();

        }



        /// <summary>

        /// Lists the files within a storage provider's path.

        /// </summary>

        /// <param name="path">The relative path to the folder which files to list.</param>

        /// <returns>The list of files in the folder.</returns>

        public IEnumerable<IStorageFile> ListFiles(string path)

        {

            var files = new List<S3StorageFile>();

            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config)) {

                var request = new ListObjectsRequest();

                request.BucketName = BucketName;

                request.Prefix = path;



                using (ListObjectsResponse response = client.ListObjects(request)) {

                    foreach (var entry in response.S3Objects.Where(e => e.Key.Last() != '/' && e.Key.Count(c => c == '/') == path.Count(c => c == '/'))) {

                        var mimeType = AmazonS3Util.MimeTypeFromExtension(entry.Key.Substring(entry.Key.LastIndexOf(".")));

                        files.Add(new S3StorageFile(entry, mimeType));

                    }

                }

            }

            

            return files;

        }



        /// <summary>

        /// Lists the folders within a storage provider's path.

        /// </summary>

        /// <param name="path">The relative path to the folder which folders to list.</param>

        /// <returns>The list of folders in the folder.</returns>

        public IEnumerable<IStorageFolder> ListFolders(string path)

        {

            var folders = new List<S3StorageFolder>();



            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config)) {

                path = path ?? "";

                var request = new ListObjectsRequest();

                request.BucketName = BucketName;

                request.Prefix = path;



                using (ListObjectsResponse response = client.ListObjects(request)) {

                    foreach (var entry in response.S3Objects.Where(e => e.Key.Last() == '/' && e.Key.Count(c => c == '/') == path.Count(c => c == '/') + 1)) {

                        var folderSize = ListFiles(entry.Key).Sum(x => x.GetSize());

                        folders.Add(new S3StorageFolder(entry, folderSize));

                    }

                }

            }



            return folders;

        }



        /// <summary>

        /// Tries to create a folder in the storage provider.

        /// </summary>

        /// <param name="path">The relative path to the folder to be created.</param>

        /// <returns>True if success; False otherwise.</returns>

        public bool TryCreateFolder(string path)

        {

            try

            {

                using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config))

                {

                    var key = string.Format(@"{0}/", path);

                    var request = new PutObjectRequest().WithBucketName(BucketName).WithKey(key);

                    request.InputStream = new MemoryStream();

                    client.PutObject(request);

                }

            }

            catch

            {

                return false;

            }



            return true;

        }



        /// <summary>

        /// Creates a folder in the storage provider.

        /// </summary>

        /// <param name="path">The relative path to the folder to be created.</param>

        /// <exception cref="ArgumentException">If the folder already exists.</exception>

        public void CreateFolder(string path)

        {

            try

            {

                using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config))

                {

                    var key = string.Format(@"{0}/", path);

                    var request = new PutObjectRequest().WithBucketName(BucketName).WithKey(key);

                    request.InputStream = new MemoryStream();

                    client.PutObject(request);

                }

            }

            catch (Exception ex)

            {

                throw new ArgumentException(T("Directory {0} already exists", path).ToString(), ex);

            }

        }



        public void DeleteFolder(string path) {

            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config)) {

                DeleteFolder(path, client);

            }

        }



        private void DeleteFolder(string path, AmazonS3 client) {

            //TODO: Refactor to use async deletion?

            foreach (var folder in ListFolders(path)) {

                DeleteFolder(folder.GetPath(), client);

            }



            foreach (var file in ListFiles(path)) {

                DeleteFile(file.GetPath(), client);

            }



            var request = new DeleteObjectRequest() {

                BucketName = BucketName,

                Key = path

            };



            using (DeleteObjectResponse response = client.DeleteObject(request)) {

                

            }

        }



        public void RenameFolder(string oldPath, string newPath)

        {

            // Todo: recursive on all keys with prefix

            throw new NotImplementedException("Folder renaming currently not supported");

        }



        public void DeleteFile(string path)

        {

            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config))

            {

                DeleteFile(path, client);

            }

        }



        private void DeleteFile(string path, AmazonS3 client) 

        {

            var request = new DeleteObjectRequest() {

                BucketName = BucketName,

                Key = path

            };



            using (DeleteObjectResponse response = client.DeleteObject(request)) {}

        }



        public void RenameFile(string oldPath, string newPath)

        {

            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config)) {

                RenameObject(oldPath, newPath, client);



                //Delete the original

                DeleteFile(oldPath);

            }

        }



        public IStorageFile CreateFile(string path)

        {

            throw new NotImplementedException("File creation currently not supported.");

        }



        private void RenameObject(string oldPath, string newPath, AmazonS3 client) {

            CopyObjectRequest copyRequest = new CopyObjectRequest()

                .WithSourceBucket(BucketName)

                .WithSourceKey(oldPath)

                .WithDestinationBucket(BucketName)

                .WithDestinationKey(newPath)

                .WithCannedACL(S3CannedACL.PublicRead);



            client.CopyObject(copyRequest);

        }



        /// <summary>

        /// Tries to save a stream in the storage provider.

        /// </summary>

        /// <param name="path">The relative path to the file to be created.</param>

        /// <param name="inputStream">The stream to be saved.</param>

        /// <returns>True if success; False otherwise.</returns>

        public bool TrySaveStream(string path, Stream inputStream)

        {

            try

            {

                SaveStream(path, inputStream);

            }

            catch

            {

                return false;

            }



            return true;

        }



        public void SaveStream(string path, Stream inputStream)

        {

            using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKey, AWSSecretKey, _S3Config))

            {

                PutObjectRequest request = new PutObjectRequest();

                request.WithBucketName(BucketName).WithKey(path).WithCannedACL(S3CannedACL.PublicRead).WithInputStream(inputStream);

                using (var response = client.PutObject(request))

                {



                }                

            }

        }



        public string Combine(string path1, string path2)

        {

            return path1 + path2;

        }

    }

}