exports.alphasort = alphasort
exports.alphasorti = alphasorti
exports.isAbsolute = process.platform === "win32" ? absWin : absUnix
exports.setopts = setopts
exports.ownProp = ownProp
exports.makeAbs = makeAbs
exports.finish = finish
exports.mark = mark
exports.isIgnored = isIgnored
exports.childrenIgnored = childrenIgnored

function ownProp (obj, field) {
  return Object.prototype.hasOwnProperty.call(obj, field)
}

var path = require("path")
var minimatch = require("minimatch")
var Minimatch = minimatch.Minimatch

function absWin (p) {
  if (absUnix(p)) return true
  // pull off the device/UNC bit from a windows path.
  // from node's lib/path.js
  var splitDeviceRe =
      /^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/]+[^\\\/]+)?([\\\/])?([\s\S]*?)$/
  var result = splitDeviceRe.exec(p)
  var device = result[1] || ''
  var isUnc = device && device.charAt(1) !== ':'
  var isAbsolute = !!result[2] || isUnc // UNC paths are always absolute

  return isAbsolute
}

function absUnix (p) {
  return p.charAt(0) === "/" || p === ""
}

function alphasorti (a, b) {
  return a.toLowerCase().localeCompare(b.toLowerCase())
}

function alphasort (a, b) {
  return a.localeCompare(b)
}

function setupIgnores (self, options) {
  self.ignore = options.ignore || []

  if (!Array.isArray(self.ignore))
    self.ignore = [self.ignore]

  if (self.ignore.length) {
    self.ignore = self.ignore.map(ignoreMap)
  }
}

function ignoreMap (pattern) {
  var gmatcher = null
  if (pattern.slice(-3) === '/**') {
    var gpattern = pattern.replace(/(\/\*\*)+$/, '')
    gmatcher = new Minimatch(gpattern, { nonegate: true })
  }

  return {
    matcher: new Minimatch(pattern, { nonegate: true }),
    gmatcher: gmatcher
  }
}

function setopts (self, pattern, options) {
  if (!options)
    options = {}

  // base-matching: just use globstar for that.
  if (options.matchBase && -1 === pattern.indexOf("/")) {
    if (options.noglobstar) {
      throw new Error("base matching requires globstar")
    }
    pattern = "**/" + pattern
  }

  self.pattern = pattern
  self.strict = options.strict !== false
  self.dot = !!options.dot
  self.mark = !!options.mark
  self.nodir = !!options.nodir
  if (self.nodir)
    self.mark = true
  self.sync = !!options.sync
  self.nounique = !!options.nounique
  self.nonull = !!options.nonull
  self.nosort = !!options.nosort
  self.nocase = !!options.nocase
  self.stat = !!options.stat
  self.noprocess = !!options.noprocess

  self.maxLength = options.maxLength || Infinity
  self.cache = options.cache || Object.create(null)
  self.statCache = options.statCache || Object.create(null)
  self.symlinks = options.symlinks || Object.create(null)

  setupIgnores(self, options)

  self.changedCwd = false
  var cwd = process.cwd()
  if (!ownProp(options, "cwd"))
    self.cwd = cwd
  else {
    self.cwd = options.cwd
    self.changedCwd = path.resolve(options.cwd) !== cwd
  }

  self.root = options.root || path.resolve(self.cwd, "/")
  self.root = path.resolve(self.root)
  if (process.platform === "win32")
    self.root = self.root.replace(/\\/g, "/")

  self.nomount = !!options.nomount

  self.minimatch = new Minimatch(pattern, options)
  self.options = self.minimatch.options
}

function finish (self) {
  var nou = self.nounique
  var all = nou ? [] : Object.create(null)

  for (var i = 0, l = self.matches.length; i < l; i ++) {
    var matches = self.matches[i]
    if (!matches) {
      if (self.nonull) {
        // do like the shell, and spit out the literal glob
        var literal = self.minimatch.globSet[i]
        if (nou)
          all.push(literal)
        else
          all[literal] = true
      }
    } else {
      // had matches
      var m = Object.keys(matches)
      if (nou)
        all.push.apply(all, m)
      else
        m.forEach(function (m) {
          all[m] = true
        })
    }
  }

  if (!nou)
    all = Object.keys(all)

  if (!self.nosort)
    all = all.sort(self.nocase ? alphasorti : alphasort)

  // at *some* point we statted all of these
  if (self.mark) {
    for (var i = 0; i < all.length; i++) {
      all[i] = self._mark(all[i])
    }
    if (self.nodir) {
      all = all.filter(function (e) {
        return !(/\/$/.test(e))
      })
    }
  }

  if (self.ignore.length)
    all = all.filter(function(m) {
      return !isIgnored(self, m)
    })

  self.found = all
}

function mark (self, p) {
  var c = self.cache[p]
  var m = p
  if (c) {
    var isDir = c === 'DIR' || Array.isArray(c)
    var slash = p.slice(-1) === '/'

    if (isDir && !slash)
      m += '/'
    else if (!isDir && slash)
      m = m.slice(0, -1)

    if (m !== p) {
      self.statCache[m] = self.statCache[p]
      self.cache[m] = self.cache[p]
    }
  }

  return m
}

// lotta situps...
function makeAbs (self, f) {
  var abs = f
  if (f.charAt(0) === '/') {
    abs = path.join(self.root, f)
  } else if (exports.isAbsolute(f)) {
    abs = f
  } else if (self.changedCwd) {
    abs = path.resolve(self.cwd, f)
  }
  return abs
}


// Return true, if pattern ends with globstar '**', for the accompanying parent directory.
// Ex:- If node_modules/** is the pattern, add 'node_modules' to ignore list along with it's contents
function isIgnored (self, path) {
  if (!self.ignore.length)
    return false

  return self.ignore.some(function(item) {
    return item.matcher.match(path) || !!(item.gmatcher && item.gmatcher.match(path))
  })
}

function childrenIgnored (self, path) {
  if (!self.ignore.length)
    return false

  return self.ignore.some(function(item) {
    return !!(item.gmatcher && item.gmatcher.match(path))
  })
}
