// Type definitions for Gulp v3.8.x
// Project: http://gulpjs.com
// Definitions by: Drew Noakes <https://drewnoakes.com>
// Definitions: https://github.com/borisyankov/DefinitelyTyped

/// <reference path="typings/node/node.d.ts" />


/**
 * Options to pass to node-glob through glob-stream.
 * Specifies two options in addition to those used by node-glob:
 * https://github.com/isaacs/node-glob#options
 */
export interface ISrcOptions {
    /**
     * Setting this to <code>false</code> will return <code>file.contents</code> as <code>null</code>
     * and not read the file at all.
     * Default: <code>true</code>.
     */
    read?: boolean;

    /**
     * Setting this to false will return <code>file.contents</code> as a stream and not buffer files.
     * This is useful when working with large files.
     * Note: Plugins might not implement support for streams.
     * Default: <code>true</code>.
     */
    buffer?: boolean;

    /**
     * The current working directory in which to search.
     * Defaults to process.cwd().
     */
    cwd?: string;

    /**
     * The place where patterns starting with / will be mounted onto.
     * Defaults to path.resolve(options.cwd, "/") (/ on Unix systems, and C:\ or some such on Windows.)
     */
    root?: string;

    /**
     * Include .dot files in normal matches and globstar matches.
     * Note that an explicit dot in a portion of the pattern will always match dot files.
     */
    dot?: boolean;

    /**
     * By default, a pattern starting with a forward-slash will be "mounted" onto the root setting, so that a valid
     * filesystem path is returned. Set this flag to disable that behavior.
     */
    nomount?: boolean;

    /**
     * Add a / character to directory matches. Note that this requires additional stat calls.
     */
    mark?: boolean;

    /**
     * Don't sort the results.
     */
    nosort?: boolean;

    /**
     * Set to true to stat all results. This reduces performance somewhat, and is completely unnecessary, unless
     * readdir is presumed to be an untrustworthy indicator of file existence. It will cause ELOOP to be triggered one
     * level sooner in the case of cyclical symbolic links.
     */
    stat?: boolean;

    /**
     * When an unusual error is encountered when attempting to read a directory, a warning will be printed to stderr.
     * Set the silent option to true to suppress these warnings.
     */
    silent?: boolean;

    /**
     * When an unusual error is encountered when attempting to read a directory, the process will just continue on in
     * search of other matches. Set the strict option to raise an error in these cases.
     */
    strict?: boolean;

    /**
     * See cache property above. Pass in a previously generated cache object to save some fs calls.
     */
    cache?: boolean;

    /**
     * A cache of results of filesystem information, to prevent unnecessary stat calls.
     * While it should not normally be necessary to set this, you may pass the statCache from one glob() call to the
     * options object of another, if you know that the filesystem will not change between calls.
     */
    statCache?: boolean;

    /**
     * Perform a synchronous glob search.
     */
    sync?: boolean;

    /**
     * In some cases, brace-expanded patterns can result in the same file showing up multiple times in the result set.
     * By default, this implementation prevents duplicates in the result set. Set this flag to disable that behavior.
     */
    nounique?: boolean;

    /**
     * Set to never return an empty set, instead returning a set containing the pattern itself.
     * This is the default in glob(3).
     */
    nonull?: boolean;

    /**
     * Perform a case-insensitive match. Note that case-insensitive filesystems will sometimes result in glob returning
     * results that are case-insensitively matched anyway, since readdir and stat will not raise an error.
     */
    nocase?: boolean;

    /**
     * Set to enable debug logging in minimatch and glob.
     */
    debug?: boolean;

    /**
     * Set to enable debug logging in glob, but not minimatch.
     */
    globDebug?: boolean;
}

export interface IDestOptions {
    /**
     * The output folder. Only has an effect if provided output folder is relative.
     * Default: process.cwd()
     */
    cwd?: string;

    /**
     * Octal permission string specifying mode for any folders that need to be created for output folder.
     * Default: 0777.
     */
    mode?: string;
}

/**
 * Options that are passed to <code>gaze</code>.
 * https://github.com/shama/gaze
 */
export interface IWatchOptions {
    /** Interval to pass to fs.watchFile. */
    interval?: number;
    /** Delay for events called in succession for the same file/event. */
    debounceDelay?: number;
    /** Force the watch mode. Either 'auto' (default), 'watch' (force native events), or 'poll' (force stat polling). */
    mode?: string;
    /** The current working directory to base file patterns from. Default is process.cwd().. */
    cwd?: string;
}

export interface IWatchEvent {
    /** The type of change that occurred, either added, changed or deleted. */
    type: string;
    /** The path to the file that triggered the event. */
    path: string;
}

/**
 * Callback to be called on each watched file change.
 */
export interface IWatchCallback {
    (event:IWatchEvent): void;
}

export interface ITaskCallback {
    /**
     * Defines a task.
     * Tasks may be made asynchronous if they are passing a callback or return a promise or a stream.
     * @param cb callback used to signal asynchronous completion. Caller includes <code>err</code> in case of error.
     */
    (cb?:(err?:any)=>void): any;
}

export interface EventEmitter {
    any: any;
}

export interface Gulp {
    /**
     * Define a task.
     *
     * @param name the name of the task. Tasks that you want to run from the command line should not have spaces in them.
     * @param fn the function that performs the task's operations. Generally this takes the form of gulp.src().pipe(someplugin()).
     */
    task(name:string, fn:ITaskCallback): any;

    /**
     * Define a task.
     *
     * @param name the name of the task. Tasks that you want to run from the command line should not have spaces in them.
     * @param dep an array of tasks to be executed and completed before your task will run.
     * @param fn the function that performs the task's operations. Generally this takes the form of gulp.src().pipe(someplugin()).
     */
    task(name:string, dep:string[], fn?:ITaskCallback): any;


    /**
     * Takes a glob and represents a file structure. Can be piped to plugins.
     * @param glob a glob string, using node-glob syntax
     * @param opt an optional option object
     */
    src(glob:string, opt?:ISrcOptions): NodeJS.ReadWriteStream;

    /**
     * Takes a glob and represents a file structure. Can be piped to plugins.
     * @param glob an array of glob strings, using node-glob syntax
     * @param opt an optional option object
     */
    src(glob:string[], opt?:ISrcOptions): NodeJS.ReadWriteStream;


    /**
     * Can be piped to and it will write files. Re-emits all data passed to it so you can pipe to multiple folders.
     * Folders that don't exist will be created.
     *
     * @param outFolder the path (output folder) to write files to.
     * @param opt
     */
    dest(outFolder:string, opt?:IDestOptions): NodeJS.ReadWriteStream;

    /**
     * Can be piped to and it will write files. Re-emits all data passed to it so you can pipe to multiple folders.
     * Folders that don't exist will be created.
     *
     * @param outFolder a function that converts a vinyl File instance into an output path
     * @param opt
     */
    dest(outFolder:(file:string)=>string, opt?:IDestOptions): NodeJS.ReadWriteStream;


    /**
     * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
     *
     * @param glob a single glob or array of globs that indicate which files to watch for changes.
     * @param tasks names of task(s) to run when a file changes, added with gulp.task()
     */
    watch(glob:string, tasks:string[]): EventEmitter;
    watch(glob:string[], tasks:string[]): EventEmitter;

    /**
     * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
     *
     * @param glob a single glob or array of globs that indicate which files to watch for changes.
     * @param opt options, that are passed to the gaze library.
     * @param tasks names of task(s) to run when a file changes, added with gulp.task()
     */
    watch(glob:string, opt:IWatchOptions, tasks:string[]): EventEmitter;
    watch(glob:string[], opt:IWatchOptions, tasks:string[]): EventEmitter;

    /**
     * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
     *
     * @param glob a single glob or array of globs that indicate which files to watch for changes.
     * @param fn a callback or array of callbacks to be called on each change.
     */
    watch(glob:string, fn:IWatchCallback): EventEmitter;
    watch(glob:string[], fn:IWatchCallback): EventEmitter;
    watch(glob:string, fn:IWatchCallback[]): EventEmitter;
    watch(glob:string[], fn:IWatchCallback[]): EventEmitter;

    /**
     * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
     *
     * @param glob a single glob or array of globs that indicate which files to watch for changes.
     * @param opt options, that are passed to the gaze library.
     * @param fn a callback or array of callbacks to be called on each change.
     */
    watch(glob:string, opt:IWatchOptions, fn:IWatchCallback): EventEmitter;
    watch(glob:string, opt:IWatchOptions, fn:IWatchCallback[]): EventEmitter;
}