// Kludges for bugs and behavior differences that can't be feature
// detected are enabled based on userAgent etc sniffing.
let userAgent = navigator.userAgent
let platform = navigator.platform

export let gecko = /gecko\/\d/i.test(userAgent)
let ie_upto10 = /MSIE \d/.test(userAgent)
let ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent)
let edge = /Edge\/(\d+)/.exec(userAgent)
export let ie = ie_upto10 || ie_11up || edge
export let ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1])
export let webkit = !edge && /WebKit\//.test(userAgent)
let qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent)
export let chrome = !edge && /Chrome\/(\d+)/.exec(userAgent)
export let chrome_version = chrome && +chrome[1]
export let presto = /Opera\//.test(userAgent)
export let safari = /Apple Computer/.test(navigator.vendor)
export let mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent)
export let phantom = /PhantomJS/.test(userAgent)

export let ios = safari && (/Mobile\/\w+/.test(userAgent) || navigator.maxTouchPoints > 2)
export let android = /Android/.test(userAgent)
// This is woefully incomplete. Suggestions for alternative methods welcome.
export let mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent)
export let mac = ios || /Mac/.test(platform)
export let chromeOS = /\bCrOS\b/.test(userAgent)
export let windows = /win/i.test(platform)

let presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/)
if (presto_version) presto_version = Number(presto_version[1])
if (presto_version && presto_version >= 15) { presto = false; webkit = true }
// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
export let flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11))
export let captureRightClick = gecko || (ie && ie_version >= 9)