using BITKit;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BITKit.IO
{

    public interface IStorageProvider
    {
        /// <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>
        Task<IStorageFile> GetFile(string path);

        /// <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>
        Task<IEnumerable<IStorageFile>> ListFiles(string path);

        /// <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>
        Task<IEnumerable<IStorageFolder>> ListFolders(string path);

        /// <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>
        Task<bool> TryCreateFolder(string path);

        /// <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>
        void CreateFolder(string path);

        /// <summary>
        /// Deletes a folder in the storage provider.
        /// </summary>
        /// <param name="path">The relative path to the folder to be deleted.</param>
        /// <exception cref="ArgumentException">If the folder doesn't exist.</exception>
        void DeleteFolder(string path);

        /// <summary>
        /// Renames a folder in the storage provider.
        /// </summary>
        /// <param name="oldPath">The relative path to the folder to be renamed.</param>
        /// <param name="newPath">The relative path to the new folder.</param>
        void RenameFolder(string oldPath, string newPath);

        /// <summary>
        /// Deletes a file in the storage provider.
        /// </summary>
        /// <param name="path">The relative path to the file to be deleted.</param>
        /// <exception cref="ArgumentException">If the file doesn't exist.</exception>
        void DeleteFile(string path);

        /// <summary>
        /// Renames a file in the storage provider.
        /// </summary>
        /// <param name="oldPath">The relative path to the file to be renamed.</param>
        /// <param name="newPath">The relative path to the new file.</param>
        void RenameFile(string oldPath, string newPath);

        /// <summary>
        /// Creates a file in the storage provider.
        /// </summary>
        /// <param name="path">The relative path to the file to be created.</param>
        /// <exception cref="ArgumentException">If the file already exists.</exception>
        /// <returns>The created file.</returns>
        Task<IStorageFile> CreateFile(string path);

        /// <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>
        Task<bool> TrySaveStream(string path, Stream inputStream);

        /// <summary>
        /// Saves 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>
        /// <exception cref="ArgumentException">If the stream can't be saved due to access permissions.</exception>
        void SaveStream(string path, Stream inputStream);

        /// <summary>
        /// Combines to paths.
        /// </summary>
        /// <param name="path1">The parent path.</param>
        /// <param name="path2">The child path.</param>
        /// <returns>The combined path.</returns>
        Task<string> Combine(string path1, string path2);

        Task<bool> FileExists(string path);


        /// <summary>
        /// Gets or sets the default shared access expiration date.
        /// </summary>
        /// <value>
        /// The default shared access expiration date.
        /// </value>
        DateTimeOffset? DefaultSharedAccessExpiration { get; set; }
    }
    public abstract class StorageProvider : IStorageProvider
    {
        public DateTimeOffset? DefaultSharedAccessExpiration { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

        public abstract Task<string> Combine(string path1, string path2);

        public abstract Task<IStorageFile> CreateFile(string path);

        public abstract void CreateFolder(string path);

        public abstract void DeleteFile(string path);

        public abstract void DeleteFolder(string path);

        public abstract Task<bool> FileExists(string path);

        public abstract Task<IStorageFile> GetFile(string path);

        public abstract Task<IEnumerable<IStorageFile>> ListFiles(string path);

        public abstract Task<IEnumerable<IStorageFolder>> ListFolders(string path);

        public abstract void RenameFile(string oldPath, string newPath);

        public abstract void RenameFolder(string oldPath, string newPath);

        public abstract void SaveStream(string path, Stream inputStream);

        public abstract Task<bool> TryCreateFolder(string path);

        public abstract Task<bool> TrySaveStream(string path, Stream inputStream);
    }
}