"use strict"

var o = require("../../ospec/ospec")
var domMock = require("../../test-utils/domMock")

var m = require("../../render/hyperscript")
var coreRenderer = require("../../render/render")
var apiRedraw = require("../../api/redraw")
var apiMounter = require("../../api/mount")

o.spec("mount", function() {
	var FRAME_BUDGET = Math.floor(1000 / 60)
	var $window, root, redrawService, mount, render

	o.beforeEach(function() {
		$window = domMock()

		root = $window.document.body

		redrawService = apiRedraw($window)
		mount = apiMounter(redrawService)
		render = coreRenderer($window).render
	})

	o("throws on invalid `root` DOM node", function() {
		var threw = false
		try {
			mount(null, {view: function() {}})
		} catch (e) {
			threw = true
		}
		o(threw).equals(true)
	})

	o("renders into `root`", function() {
		mount(root, {
			view : function() {
				return m("div")
			}
		})

		o(root.firstChild.nodeName).equals("DIV")
	})

	o("mounting null unmounts", function() {
		mount(root, {
			view : function() {
				return m("div")
			}
		})

		mount(root, null)

		o(root.childNodes.length).equals(0)
	})

	o("redraws on events", function(done) {
		var onupdate = o.spy()
		var oninit   = o.spy()
		var onclick  = o.spy()
		var e = $window.document.createEvent("MouseEvents")

		e.initEvent("click", true, true)

		mount(root, {
			view : function() {
				return m("div", {
					oninit   : oninit,
					onupdate : onupdate,
					onclick  : onclick,
				})
			}
		})

		root.firstChild.dispatchEvent(e)

		o(oninit.callCount).equals(1)
		o(onupdate.callCount).equals(0)

		o(onclick.callCount).equals(1)
		o(onclick.this).equals(root.firstChild)
		o(onclick.args[0].type).equals("click")
		o(onclick.args[0].target).equals(root.firstChild)

		// Wrapped to give time for the rate-limited redraw to fire
		setTimeout(function() {
			o(onupdate.callCount).equals(1)

			done()
		}, FRAME_BUDGET)
	})

	o("redraws several mount points on events", function(done, timeout) {
		timeout(60)
		
		var onupdate0 = o.spy()
		var oninit0   = o.spy()
		var onclick0  = o.spy()
		var onupdate1 = o.spy()
		var oninit1   = o.spy()
		var onclick1  = o.spy()

		var e = $window.document.createEvent("MouseEvents")

		e.initEvent("click", true, true)

		render(root, [
			m("#child0"),
			m("#child1")
		])

		mount(root.childNodes[0], {
			view : function() {
				return m("div", {
					oninit   : oninit0,
					onupdate : onupdate0,
					onclick  : onclick0,
				})
			}
		})

		o(oninit0.callCount).equals(1)
		o(onupdate0.callCount).equals(0)

		mount(root.childNodes[1], {
			view : function() {
				return m("div", {
					oninit   : oninit1,
					onupdate : onupdate1,
					onclick  : onclick1,
				})
			}
		})

		o(oninit1.callCount).equals(1)
		o(onupdate1.callCount).equals(0)

		root.childNodes[0].firstChild.dispatchEvent(e)
		o(onclick0.callCount).equals(1)
		o(onclick0.this).equals(root.childNodes[0].firstChild)

		setTimeout(function() {
			o(onupdate0.callCount).equals(1)
			o(onupdate1.callCount).equals(1)

			root.childNodes[1].firstChild.dispatchEvent(e)
			o(onclick1.callCount).equals(1)
			o(onclick1.this).equals(root.childNodes[1].firstChild)

			setTimeout(function() {
				o(onupdate0.callCount).equals(2)
				o(onupdate1.callCount).equals(2)

				done()
			}, FRAME_BUDGET)
		}, FRAME_BUDGET)

	})

	o("event handlers can skip redraw", function(done) {
		var onupdate = o.spy()
		var oninit = o.spy()
		var e = $window.document.createEvent("MouseEvents")

		e.initEvent("click", true, true)

		mount(root, {
			view: function() {
				return m("div", {
					oninit: oninit,
					onupdate: onupdate,
					onclick: function(e) {
						e.redraw = false
					}
				})
			}
		})

		root.firstChild.dispatchEvent(e)

		o(oninit.callCount).equals(1)

		// Wrapped to ensure no redraw fired
		setTimeout(function() {
			o(onupdate.callCount).equals(0)

			done()
		}, FRAME_BUDGET)
	})

	o("redraws when the render function is run", function(done) {
		var onupdate = o.spy()
		var oninit = o.spy()

		mount(root, {
			view : function() {
				return m("div", {
					oninit: oninit,
					onupdate: onupdate
				})
			}
		})

		o(oninit.callCount).equals(1)
		o(onupdate.callCount).equals(0)

		redrawService.redraw()

		// Wrapped to give time for the rate-limited redraw to fire
		setTimeout(function() {
			o(onupdate.callCount).equals(1)

			done()
		}, FRAME_BUDGET)
	})
	
	o("throttles", function(done, timeout) {
		timeout(200)

		var i = 0
		mount(root, {view: function() {i++}})
		var before = i

		redrawService.redraw()
		redrawService.redraw()
		redrawService.redraw()
		redrawService.redraw()

		var after = i

		setTimeout(function(){
			o(before).equals(1) // mounts synchronously
			o(after).equals(1) // throttles rest
			o(i).equals(2)
			done()
		},40)
	})
})