// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

(function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
      mod(require("../../lib/codemirror"))
    else if (typeof define == "function" && define.amd) // AMD
      define(["../../lib/codemirror"], mod)
    else // Plain browser env
      mod(CodeMirror)
  })(function(CodeMirror) {
    "use strict"

    CodeMirror.defineOption("autoRefresh", false, function(cm, val) {
      if (cm.state.autoRefresh) {
        stopListening(cm, cm.state.autoRefresh)
        cm.state.autoRefresh = null
      }
      if (val && cm.display.wrapper.offsetHeight == 0)
        startListening(cm, cm.state.autoRefresh = {delay: val.delay || 250})
    })

    function startListening(cm, state) {
      function check() {
        if (cm.display.wrapper.offsetHeight) {
          stopListening(cm, state)
          if (cm.display.lastWrapHeight != cm.display.wrapper.clientHeight)
            cm.refresh()
        } else {
          state.timeout = setTimeout(check, state.delay)
        }
      }
      state.timeout = setTimeout(check, state.delay)
      state.hurry = function() {
        clearTimeout(state.timeout)
        state.timeout = setTimeout(check, 50)
      }
      CodeMirror.on(window, "mouseup", state.hurry)
      CodeMirror.on(window, "keyup", state.hurry)
    }

    function stopListening(_cm, state) {
      clearTimeout(state.timeout)
      CodeMirror.off(window, "mouseup", state.hurry)
      CodeMirror.off(window, "keyup", state.hurry)
    }
  });
