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/*!

* ee-first

* Copyright(c) 2014 Jonathan Ong

* MIT Licensed

*/

'use strict'

/**

* Module exports.

* @public

*/

module.exports = first

/**

* Get the first event in a set of event emitters and event pairs.

*

* @param {array} stuff

* @param {function} done

* @public

*/

function first(stuff, done) {

if (!Array.isArray(stuff))

throw new TypeError('arg must be an array of [ee, events...] arrays')

var cleanups = []

for (var i = 0; i < stuff.length; i++) {

var arr = stuff[i]

if (!Array.isArray(arr) || arr.length < 2)

throw new TypeError('each array member must be [ee, events...]')

var ee = arr[0]

for (var j = 1; j < arr.length; j++) {

var event = arr[j]

var fn = listener(event, callback)

// listen to the event

ee.on(event, fn)

// push this listener to the list of cleanups

cleanups.push({

ee: ee,

event: event,

fn: fn,

})

}

}

function callback() {

cleanup()

done.apply(null, arguments)

}

function cleanup() {

var x

for (var i = 0; i < cleanups.length; i++) {

x = cleanups[i]

x.ee.removeListener(x.event, x.fn)

}

}

function thunk(fn) {

done = fn

}

thunk.cancel = cleanup

return thunk

}

/**

* Create the event listener.

* @private

*/

function listener(event, done) {

return function onevent(arg1) {

var args = new Array(arguments.length)

var ee = this

var err = event === 'error'

? arg1

: null

// copy args to prevent arguments escaping scope

for (var i = 0; i < args.length; i++) {

args[i] = arguments[i]

}

done(err, ee, event, args)

}

}