'use strict';

// MODULES //

var isFunction = require( '@stdlib/assert/is-function' );
var isCollection = require( '@stdlib/assert/is-collection' );
var PINF = require( '@stdlib/math/constants/float64-pinf' );
var validate = require( './validate.js' );
var limit = require( './limit.js' );


// MAIN //

/**
* Returns a function for testing whether all elements in a collection pass a test implemented by a predicate function.
*
* ## Notes
*
* * If a predicate function calls the provided callback with a truthy error argument, the function suspends execution and immediately calls the `done` callback for subsequent error handling.
* * This function does __not__ guarantee that execution is asynchronous. To do so, wrap the `done` callback in a function which either executes at the end of the current stack (e.g., `nextTick`) or during a subsequent turn of the event loop (e.g., `setIntermediate`, `setTimeout`).
*
*
* @param {Options} [options] - function options
* @param {*} [options.thisArg] - execution context
* @param {PositiveInteger} [options.limit] - maximum number of pending invocations at any one time
* @param {boolean} [options.series] - boolean indicating whether to wait for a previous invocation to complete before invoking a provided function for the next element in a collection
* @param {Function} predicate - predicate function to invoke for each element in a collection
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {TypeError} last argument must be a function
* @returns {Function} function which invokes the predicate function once for each element in a collection
*
* @example
* var readFile = require( '@stdlib/fs/read-file' );
*
* function predicate( file, next ) {
*     var opts = {
*         'encoding': 'utf8'
*     };
*     readFile( file, opts, onFile );
*
*     function onFile( error ) {
*         if ( error ) {
*             return next( null, false );
*         }
*         next( null, true );
*     }
* }
*
* var opts = {
*     'series': true
* };
*
* // Create an `everyAsync` function which invokes the predicate function for each collection element sequentially:
* var everyAsync = factory( opts, predicate );
*
* // Create a collection over which to iterate:
* var files = [
*     './beep.js',
*     './boop.js'
* ];
*
* // Define a callback which handles results:
* function done( error, bool ) {
*     if ( error ) {
*         throw error;
*     }
*     if ( bool ) {
*         console.log( 'Successfully read all files.' );
*     } else {
*         console.log( 'Was unable to read all files.' );
*     }
* }
*
* // Run `read` for each element in `files`:
* everyAsync( files, done );
*/
function factory( options, predicate ) {
	var opts;
	var err;
	var f;

	opts = {};
	if ( arguments.length > 1 ) {
		err = validate( opts, options );
		if ( err ) {
			throw err;
		}
		f = predicate;
	} else {
		f = options;
	}
	if ( !isFunction( f ) ) {
		throw new TypeError( 'invalid input argument. Last argument must be a function. Value: `'+f+'`.' );
	}
	if ( opts.series ) {
		opts.limit = 1;
	} else if ( !opts.limit ) {
		opts.limit = PINF;
	}
	return everyAsync;

	/**
	* Invokes a predicate function for each element in a collection.
	*
	* @private
	* @param {Collection} collection - input collection
	* @param {Callback} done - function to invoke upon completion
	* @throws {TypeError} first argument must be a collection
	* @throws {TypeError} last argument must be a function
	* @returns {void}
	*/
	function everyAsync( collection, done ) {
		if ( !isCollection( collection ) ) {
			throw new TypeError( 'invalid input argument. First argument must be a collection. Value: `'+collection+'.`' );
		}
		if ( !isFunction( done ) ) {
			throw new TypeError( 'invalid input argument. Last argument must be a function. Value: `'+done+'`.' );
		}
		return limit( collection, opts, f, clbk );

		/**
		* Callback invoked upon completion.
		*
		* @private
		* @param {*} [error] - error
		* @param {boolean} bool - test result
		* @returns {void}
		*/
		function clbk( error, bool ) {
			if ( error ) {
				return done( error, false );
			}
			done( null, bool );
		} // end FUNCTION cblk()
	} // end FUNCTION everyAsync()
} // end FUNCTION factory()


// EXPORTS //

module.exports = factory;

@@ -2633,22 +2633,19 @@
  // 
-Run %60read%60 for
+Try to read
  eac

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