"use strict"

var o = require("../../ospec/ospec")
var stream = require("../stream")
var scan = require("../scan")

o.spec("scan", function() {
	o("defaults to seed", function() {
		var parent = stream()
		var child = scan(function(out, p) {
			return out - p
		}, 123, parent)
		o(child()).equals(123)
	})

	o("accumulates values as expected", function() {
		var parent = stream()
		var child = scan(function(arr, p) {
			return arr.concat(p)
		}, [], parent)

		parent(7)
		parent("11")
		parent(undefined)
		parent({ a: 1 })
		var result = child()

		// deepEquals fails on arrays?
		o(result[0]).equals(7)
		o(result[1]).equals("11")
		o(result[2]).equals(undefined)
		o(result[3]).deepEquals({a: 1})
	})
})

o.spec("scanMerge", function() {
	var scanMerge

	o.beforeEach(function() {
		scanMerge = require("../scan-merge")
	})

	o("defaults to seed", function() {
		var parent1 = stream()
		var parent2 = stream()

		var child = scanMerge([
			[parent1, function(out, p1) {
				return out + p1
			}],
			[parent2, function(out, p2) {
				return out + p2
			}]
		], -10)

		o(child()).equals(-10)
	})

	o("accumulates as expected", function() {
		var parent1 = stream()
		var parent2 = stream()

		var child = scanMerge([
			[parent1, function(out, p1) {
				return out + p1
			}],
			[parent2, function(out, p2) {
				return out + p2 + p2
			}]
		], "a")

		parent1("b")
		parent2("c")
		parent1("b")

		o(child()).equals("abccb")
	})
})