/**
 * Provides high-level abstractions for file system entities such as files, folders, known folders, paths, separators, etc.
 * @module "file-system"
 */ /** */

/**
 * Represents a single entity on the file system.
 */
export class FileSystemEntity {
    /**
     * Gets the Date object specifying the last time this entity was modified.
     */
    lastModified: Date;

    /**
     * Gets the name of the entity.
     */
    name: string;

    /**
     * Gets the fully-qualified path (including the extension for a File) of the entity.
     */
    path: string;

    /**
     * Gets the Folder object representing the parent of this entity. 
     * Will be null for a root folder like Documents or Temporary.
     * This property is readonly.
     */
    parent: Folder;

    /**
     * Removes (deletes) the current Entity from the file system.
     */
    remove(): Promise<any>;

    /**
     * Removes (deletes) the current Entity from the file system synchronously.
     */
    removeSync(onError?: (error: any) => any): void;

    /**
     * Renames the current entity using the specified name.
     * @param newName The new name to be applied to the entity.
     */
    rename(newName: string): Promise<any>;

    /**
     * Renames the current entity synchronously, using the specified name.
     * @param newName The new name to be applied to the entity.
     */
    renameSync(newName: string, onError?: (error: any) => any): void;
}

/**
 * Represents a File entity on the file system.
 */
export class File extends FileSystemEntity {
    /**
     * Checks whether a File with the specified path already exists.
     * @param path The path to check for.
     */
    static exists(path: string): boolean;

    /**
     * Gets the extension of the file.
     */
    extension: string;

    /**
     * Gets a value indicating whether the file is currently locked, meaning a background operation associated with this file is running.
     */
    isLocked: boolean;

    /**
     * Gets or creates a File entity at the specified path.
     * @param path The path to get/create the file at.
     */
    static fromPath(path: string): File;

    /**
     * Reads the content of the file as a string using the specified encoding (defaults to UTF-8).
     * @param encoding An optional value specifying the preferred encoding (defaults to UTF-8).
     */
    readText(encoding?: string): Promise<string>;

    /**
     * Reads the content of the file as a string synchronously, using the specified encoding (defaults to UTF-8).
     * @param onError An optional function to be called if some IO-error occurs.
     * @param encoding An optional value specifying the preferred encoding (defaults to UTF-8).
     */
    readTextSync(onError?: (error: any) => any, encoding?: string): string;

    /**
     * Reads the binary content of the file synchronously.
     * @param onError An optional function to be called if some IO-error occurs.
     */
    readSync(onError?: (error: any) => any): any;

    /**
     * Writes the provided string to the file, using the specified encoding (defaults to UTF-8).
     * @param content The content to be saved to the file.
     * @param encoding An optional value specifying the preferred encoding (defaults to UTF-8).
     */
    writeText(content: string, encoding?: string): Promise<any>;

    /**
     * Writes the provided string to the file synchronously, using the specified encoding (defaults to UTF-8).
     * @param content The content to be saved to the file.
     * @param onError An optional function to be called if some IO-error occurs.
     * @param encoding An optional value specifying the preferred encoding (defaults to UTF-8).
     */
    writeTextSync(content: string, onError?: (error: any) => any, encoding?: string): void;

    /**
     * Writes the provided binary content to the file synchronously.
     * @param content The binary content to be saved to the file.
     * @param onError An optional function to be called if some IO-error occurs.
     */
    writeSync(content: any, onError?: (error: any) => any): void;
}

/**
 * Represents a Folder (directory) entity on the file system.
 */
export class Folder extends FileSystemEntity {
    /**
     * Determines whether this instance is a KnownFolder (accessed through the KnownFolders object).
     */
    isKnown: boolean;

    /**
     * Gets or creates a Folder entity at the specified path.
     * @param path The path to get/create the folder at.
     */
    static fromPath(path: string): Folder;

    /**
     * Checks whether a Folder with the specified path already exists.
     * @param path The path to check for.
     */
    static exists(path: string): boolean;

    /**
     * Checks whether this Folder contains an Entity with the specified name.
     * The path of the folder is added to the name to resolve the complete path to check for.
     * @param name The name of the entity to check for.
     */
    contains(name: string): boolean;

    /**
     * Deletes all the files and folders (recursively), contained within this Folder.
     */
    clear(): Promise<any>;

    /**
     * Deletes all the files and folders (recursively), contained within this Folder synchronously.
     * @param onError An optional function to be called if some error occurs.
     */
    clearSync(onError?: (error: any) => void): void;

    /**
     * Gets or creates a File entity with the specified name within this Folder.
     * @param name The name of the file to get/create.
     */
    getFile(name: string): File;

    /**
     * Gets or creates a Folder entity with the specified name within this Folder.
     * @param name The name of the folder to get/create.
     */
    getFolder(name: string): Folder;

    /**
     * Gets all the top-level entities residing within this folder.
     */
    getEntities(): Promise<Array<FileSystemEntity>>;

    /**
     * Gets all the top-level entities residing within this folder synchronously.
     * @param onError An optional function to be called if some error occurs.
     */
    getEntitiesSync(onError?: (error: any) => any): Promise<Array<FileSystemEntity>>;

    /**
     * Enumerates all the top-level FileSystem entities residing within this folder.
     * @param onEntity A callback that receives the current entity. If the callback returns false this will mean for the iteration to stop.
     */
    eachEntity(onEntity: (entity: FileSystemEntity) => boolean);
}

/**
 * Provides access to the top-level Folders instances that are accessible from the application. Use these as entry points to access the FileSystem.
 */
export module knownFolders {
    /**
     * Gets the Documents folder available for the current application. This Folder is private for the application and not accessible from Users/External apps.
     */
    export function documents(): Folder;

    /**
     * Gets the Temporary (Caches) folder available for the current application. This Folder is private for the application and not accessible from Users/External apps.
     */
    export function temp(): Folder;

    /**
     * Gets the root folder for the current application. This Folder is private for the application and not accessible from Users/External apps.
     * iOS - this folder is read-only and contains the app and all its resources.
     */
    export function currentApp(): Folder;
    
    /**
     * Contains iOS-specific known folders.
     */
    module ios {
        /**
         * Gets the NSLibraryDirectory.
         */
        export function library(): Folder;
        
        /**
         * Gets the NSDeveloperDirectory.
         */
        export function developer(): Folder;
        
        /**
         * Gets the NSDesktopDirectory.
         */
        export function desktop(): Folder;
        
        /**
         * Gets the NSDownloadsDirectory.
         */
        export function downloads(): Folder;
        
        /**
         * Gets the NSMoviesDirectory.
         */
        export function movies(): Folder;
        
        /**
         * Gets the NSMusicDirectory.
         */
        export function music(): Folder;
        
        /**
         * Gets the NSPicturesDirectory.
         */
        export function pictures(): Folder;
        
        /**
         * Gets the NSSharedPublicDirectory.
         */
        export function sharedPublic(): Folder;
    } 
}

/**
 * Enables path-specific operations like join, extension, etc.
 */
export module path {
    /**
     * Normalizes a path, taking care of occurrances like ".." and "//".
     * @param path The path to be normalized.
     */
    export function normalize(path: string): string;

    /**
     * Joins all the provided string components, forming a valid and normalized path.
     * @param paths An array of string components to be joined.
     */
    export function join(...paths: string[]): string;

    /**
     * Gets the string used to separate file paths.
     */
    export var separator: string;
}
