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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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// declare global: DOMRect
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  "use strict";
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  var HINT_ELEMENT_CLASS        = "CodeMirror-hint";
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  var ACTIVE_HINT_ELEMENT_CLASS = "CodeMirror-hint-active";
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  // This is the old interface, kept around for now to stay
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  // backwards-compatible.
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  CodeMirror.showHint = function(cm, getHints, options) {
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    if (!getHints) return cm.showHint(options);
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    if (options && options.async) getHints.async = true;
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    var newOpts = {hint: getHints};
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    if (options) for (var prop in options) newOpts[prop] = options[prop];
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    return cm.showHint(newOpts);
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  };
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  CodeMirror.defineExtension("showHint", function(options) {
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    options = parseOptions(this, this.getCursor("start"), options);
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    var selections = this.listSelections()
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    if (selections.length > 1) return;
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    // By default, don't allow completion when something is selected.
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    // A hint function can have a `supportsSelection` property to
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    // indicate that it can handle selections.
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    if (this.somethingSelected()) {
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      if (!options.hint.supportsSelection) return;
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      // Don't try with cross-line selections
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      for (var i = 0; i < selections.length; i++)
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        if (selections[i].head.line != selections[i].anchor.line) return;
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    }
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    if (this.state.completionActive) this.state.completionActive.close();
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    var completion = this.state.completionActive = new Completion(this, options);
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    if (!completion.options.hint) return;
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    CodeMirror.signal(this, "startCompletion", this);
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    completion.update(true);
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  });
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  CodeMirror.defineExtension("closeHint", function() {
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    if (this.state.completionActive) this.state.completionActive.close()
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  })
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  function Completion(cm, options) {
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    this.cm = cm;
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    this.options = options;
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    this.widget = null;
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    this.debounce = 0;
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    this.tick = 0;
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    this.startPos = this.cm.getCursor("start");
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    this.startLen = this.cm.getLine(this.startPos.line).length - this.cm.getSelection().length;
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    if (this.options.updateOnCursorActivity) {
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      var self = this;
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      cm.on("cursorActivity", this.activityFunc = function() { self.cursorActivity(); });
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    }
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  }
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  var requestAnimationFrame = window.requestAnimationFrame || function(fn) {
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    return setTimeout(fn, 1000/60);
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  };
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  var cancelAnimationFrame = window.cancelAnimationFrame || clearTimeout;
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  Completion.prototype = {
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    close: function() {
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      if (!this.active()) return;
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      this.cm.state.completionActive = null;
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      this.tick = null;
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      if (this.options.updateOnCursorActivity) {
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        this.cm.off("cursorActivity", this.activityFunc);
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      }
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      if (this.widget && this.data) CodeMirror.signal(this.data, "close");
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      if (this.widget) this.widget.close();
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      CodeMirror.signal(this.cm, "endCompletion", this.cm);
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    },
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    active: function() {
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      return this.cm.state.completionActive == this;
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    },
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    pick: function(data, i) {
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      var completion = data.list[i], self = this;
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      this.cm.operation(function() {
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        if (completion.hint)
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          completion.hint(self.cm, data, completion);
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        else
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          self.cm.replaceRange(getText(completion), completion.from || data.from,
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                               completion.to || data.to, "complete");
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        CodeMirror.signal(data, "pick", completion);
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        self.cm.scrollIntoView();
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      });
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      if (this.options.closeOnPick) {
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        this.close();
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      }
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    },
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    cursorActivity: function() {
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      if (this.debounce) {
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        cancelAnimationFrame(this.debounce);
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        this.debounce = 0;
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      }
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      var identStart = this.startPos;
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      if(this.data) {
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        identStart = this.data.from;
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      }
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      var pos = this.cm.getCursor(), line = this.cm.getLine(pos.line);
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      if (pos.line != this.startPos.line || line.length - pos.ch != this.startLen - this.startPos.ch ||
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          pos.ch < identStart.ch || this.cm.somethingSelected() ||
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          (!pos.ch || this.options.closeCharacters.test(line.charAt(pos.ch - 1)))) {
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        this.close();
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      } else {
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        var self = this;
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        this.debounce = requestAnimationFrame(function() {self.update();});
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        if (this.widget) this.widget.disable();
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      }
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    },
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    update: function(first) {
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      if (this.tick == null) return
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      var self = this, myTick = ++this.tick
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      fetchHints(this.options.hint, this.cm, this.options, function(data) {
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        if (self.tick == myTick) self.finishUpdate(data, first)
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      })
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    },
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    finishUpdate: function(data, first) {
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      if (this.data) CodeMirror.signal(this.data, "update");
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      var picked = (this.widget && this.widget.picked) || (first && this.options.completeSingle);
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      if (this.widget) this.widget.close();
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      this.data = data;
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      if (data && data.list.length) {
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        if (picked && data.list.length == 1) {
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          this.pick(data, 0);
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        } else {
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          this.widget = new Widget(this, data);
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          CodeMirror.signal(data, "shown");
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        }
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      }
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    }
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  };
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  function parseOptions(cm, pos, options) {
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    var editor = cm.options.hintOptions;
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    var out = {};
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    for (var prop in defaultOptions) out[prop] = defaultOptions[prop];
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    if (editor) for (var prop in editor)
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      if (editor[prop] !== undefined) out[prop] = editor[prop];
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    if (options) for (var prop in options)
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      if (options[prop] !== undefined) out[prop] = options[prop];
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    if (out.hint.resolve) out.hint = out.hint.resolve(cm, pos)
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    return out;
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  }
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  function getText(completion) {
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    if (typeof completion == "string") return completion;
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    else return completion.text;
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  }
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  function buildKeyMap(completion, handle) {
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    var baseMap = {
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      Up: function() {handle.moveFocus(-1);},
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      Down: function() {handle.moveFocus(1);},
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      PageUp: function() {handle.moveFocus(-handle.menuSize() + 1, true);},
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      PageDown: function() {handle.moveFocus(handle.menuSize() - 1, true);},
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      Home: function() {handle.setFocus(0);},
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      End: function() {handle.setFocus(handle.length - 1);},
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      Enter: handle.pick,
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      Tab: handle.pick,
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      Esc: handle.close
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    };
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    var mac = /Mac/.test(navigator.platform);
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    if (mac) {
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      baseMap["Ctrl-P"] = function() {handle.moveFocus(-1);};
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      baseMap["Ctrl-N"] = function() {handle.moveFocus(1);};
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    }
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    var custom = completion.options.customKeys;
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    var ourMap = custom ? {} : baseMap;
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    function addBinding(key, val) {
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      var bound;
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      if (typeof val != "string")
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        bound = function(cm) { return val(cm, handle); };
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      // This mechanism is deprecated
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      else if (baseMap.hasOwnProperty(val))
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        bound = baseMap[val];
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      else
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        bound = val;
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      ourMap[key] = bound;
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    }
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    if (custom)
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      for (var key in custom) if (custom.hasOwnProperty(key))
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        addBinding(key, custom[key]);
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    var extra = completion.options.extraKeys;
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    if (extra)
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      for (var key in extra) if (extra.hasOwnProperty(key))
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        addBinding(key, extra[key]);
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    return ourMap;
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  }
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  function getHintElement(hintsElement, el) {
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    while (el && el != hintsElement) {
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      if (el.nodeName.toUpperCase() === "LI" && el.parentNode == hintsElement) return el;
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      el = el.parentNode;
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    }
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  }
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  function Widget(completion, data) {
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    this.id = "cm-complete-" + Math.floor(Math.random(1e6))
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    this.completion = completion;
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    this.data = data;
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    this.picked = false;
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    var widget = this, cm = completion.cm;
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    var ownerDocument = cm.getInputField().ownerDocument;
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    var parentWindow = ownerDocument.defaultView || ownerDocument.parentWindow;
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    var hints = this.hints = ownerDocument.createElement("ul");
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    hints.setAttribute("role", "listbox")
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    hints.setAttribute("aria-expanded", "true")
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    hints.id = this.id
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    var theme = completion.cm.options.theme;
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    hints.className = "CodeMirror-hints " + theme;
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    this.selectedHint = data.selectedHint || 0;
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    var completions = data.list;
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    for (var i = 0; i < completions.length; ++i) {
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      var elt = hints.appendChild(ownerDocument.createElement("li")), cur = completions[i];
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      var className = HINT_ELEMENT_CLASS + (i != this.selectedHint ? "" : " " + ACTIVE_HINT_ELEMENT_CLASS);
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      if (cur.className != null) className = cur.className + " " + className;
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      elt.className = className;
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      if (i == this.selectedHint) elt.setAttribute("aria-selected", "true")
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      elt.id = this.id + "-" + i
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      elt.setAttribute("role", "option")
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      if (cur.render) cur.render(elt, data, cur);
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      else elt.appendChild(ownerDocument.createTextNode(cur.displayText || getText(cur)));
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      elt.hintId = i;
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    }
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    var container = completion.options.container || ownerDocument.body;
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    var pos = cm.cursorCoords(completion.options.alignWithWord ? data.from : null);
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    var left = pos.left, top = pos.bottom, below = true;
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    var offsetLeft = 0, offsetTop = 0;
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    if (container !== ownerDocument.body) {
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      // We offset the cursor position because left and top are relative to the offsetParent's top left corner.
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      var isContainerPositioned = ['absolute', 'relative', 'fixed'].indexOf(parentWindow.getComputedStyle(container).position) !== -1;
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      var offsetParent = isContainerPositioned ? container : container.offsetParent;
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      var offsetParentPosition = offsetParent.getBoundingClientRect();
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      var bodyPosition = ownerDocument.body.getBoundingClientRect();
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      offsetLeft = (offsetParentPosition.left - bodyPosition.left - offsetParent.scrollLeft);
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      offsetTop = (offsetParentPosition.top - bodyPosition.top - offsetParent.scrollTop);
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    }
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    hints.style.left = (left - offsetLeft) + "px";
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    hints.style.top = (top - offsetTop) + "px";
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    // If we're at the edge of the screen, then we want the menu to appear on the left of the cursor.
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    var winW = parentWindow.innerWidth || Math.max(ownerDocument.body.offsetWidth, ownerDocument.documentElement.offsetWidth);
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    var winH = parentWindow.innerHeight || Math.max(ownerDocument.body.offsetHeight, ownerDocument.documentElement.offsetHeight);
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    container.appendChild(hints);
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    cm.getInputField().setAttribute("aria-autocomplete", "list")
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    cm.getInputField().setAttribute("aria-owns", this.id)
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    cm.getInputField().setAttribute("aria-activedescendant", this.id + "-" + this.selectedHint)
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    var box = completion.options.moveOnOverlap ? hints.getBoundingClientRect() : new DOMRect();
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    var scrolls = completion.options.paddingForScrollbar ? hints.scrollHeight > hints.clientHeight + 1 : false;
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    // Compute in the timeout to avoid reflow on init
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    var startScroll;
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    setTimeout(function() { startScroll = cm.getScrollInfo(); });
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    var overlapY = box.bottom - winH;
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    if (overlapY > 0) {
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      var height = box.bottom - box.top, curTop = pos.top - (pos.bottom - box.top);
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      if (curTop - height > 0) { // Fits above cursor
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        hints.style.top = (top = pos.top - height - offsetTop) + "px";
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        below = false;
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      } else if (height > winH) {
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        hints.style.height = (winH - 5) + "px";
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        hints.style.top = (top = pos.bottom - box.top - offsetTop) + "px";
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        var cursor = cm.getCursor();
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        if (data.from.ch != cursor.ch) {
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          pos = cm.cursorCoords(cursor);
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          hints.style.left = (left = pos.left - offsetLeft) + "px";
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          box = hints.getBoundingClientRect();
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        }
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      }
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    }
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    var overlapX = box.right - winW;
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    if (scrolls) overlapX += cm.display.nativeBarWidth;
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    if (overlapX > 0) {
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      if (box.right - box.left > winW) {
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        hints.style.width = (winW - 5) + "px";
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        overlapX -= (box.right - box.left) - winW;
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      }
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      hints.style.left = (left = pos.left - overlapX - offsetLeft) + "px";
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    }
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    if (scrolls) for (var node = hints.firstChild; node; node = node.nextSibling)
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      node.style.paddingRight = cm.display.nativeBarWidth + "px"
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    cm.addKeyMap(this.keyMap = buildKeyMap(completion, {
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      moveFocus: function(n, avoidWrap) { widget.changeActive(widget.selectedHint + n, avoidWrap); },
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      setFocus: function(n) { widget.changeActive(n); },
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      menuSize: function() { return widget.screenAmount(); },
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      length: completions.length,
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      close: function() { completion.close(); },
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      pick: function() { widget.pick(); },
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      data: data
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    }));
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    if (completion.options.closeOnUnfocus) {
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      var closingOnBlur;
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      cm.on("blur", this.onBlur = function() { closingOnBlur = setTimeout(function() { completion.close(); }, 100); });
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      cm.on("focus", this.onFocus = function() { clearTimeout(closingOnBlur); });
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    }
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    cm.on("scroll", this.onScroll = function() {
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      var curScroll = cm.getScrollInfo(), editor = cm.getWrapperElement().getBoundingClientRect();
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      if (!startScroll) startScroll = cm.getScrollInfo();
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      var newTop = top + startScroll.top - curScroll.top;
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      var point = newTop - (parentWindow.pageYOffset || (ownerDocument.documentElement || ownerDocument.body).scrollTop);
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      if (!below) point += hints.offsetHeight;
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      if (point <= editor.top || point >= editor.bottom) return completion.close();
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      hints.style.top = newTop + "px";
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      hints.style.left = (left + startScroll.left - curScroll.left) + "px";
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    });
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    CodeMirror.on(hints, "dblclick", function(e) {
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      var t = getHintElement(hints, e.target || e.srcElement);
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      if (t && t.hintId != null) {widget.changeActive(t.hintId); widget.pick();}
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    });
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    CodeMirror.on(hints, "click", function(e) {
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      var t = getHintElement(hints, e.target || e.srcElement);
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      if (t && t.hintId != null) {
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        widget.changeActive(t.hintId);
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        if (completion.options.completeOnSingleClick) widget.pick();
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      }
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    });
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    CodeMirror.on(hints, "mousedown", function() {
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      setTimeout(function(){cm.focus();}, 20);
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    });
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    // The first hint doesn't need to be scrolled to on init
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    var selectedHintRange = this.getSelectedHintRange();
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    if (selectedHintRange.from !== 0 || selectedHintRange.to !== 0) {
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      this.scrollToActive();
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    }
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    CodeMirror.signal(data, "select", completions[this.selectedHint], hints.childNodes[this.selectedHint]);
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    return true;
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  }
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  Widget.prototype = {
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    close: function() {
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      if (this.completion.widget != this) return;
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      this.completion.widget = null;
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      if (this.hints.parentNode) this.hints.parentNode.removeChild(this.hints);
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      this.completion.cm.removeKeyMap(this.keyMap);
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      var input = this.completion.cm.getInputField()
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      input.removeAttribute("aria-activedescendant")
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      input.removeAttribute("aria-owns")
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      var cm = this.completion.cm;
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      if (this.completion.options.closeOnUnfocus) {
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        cm.off("blur", this.onBlur);
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        cm.off("focus", this.onFocus);
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      }
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      cm.off("scroll", this.onScroll);
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    },
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    disable: function() {
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      this.completion.cm.removeKeyMap(this.keyMap);
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      var widget = this;
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      this.keyMap = {Enter: function() { widget.picked = true; }};
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      this.completion.cm.addKeyMap(this.keyMap);
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    },
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    pick: function() {
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      this.completion.pick(this.data, this.selectedHint);
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    },
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    changeActive: function(i, avoidWrap) {
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      if (i >= this.data.list.length)
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        i = avoidWrap ? this.data.list.length - 1 : 0;
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      else if (i < 0)
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        i = avoidWrap ? 0  : this.data.list.length - 1;
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      if (this.selectedHint == i) return;
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      var node = this.hints.childNodes[this.selectedHint];
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      if (node) {
408
        node.className = node.className.replace(" " + ACTIVE_HINT_ELEMENT_CLASS, "");
409
        node.removeAttribute("aria-selected")
410
      }
411
      node = this.hints.childNodes[this.selectedHint = i];
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      node.className += " " + ACTIVE_HINT_ELEMENT_CLASS;
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      node.setAttribute("aria-selected", "true")
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      this.completion.cm.getInputField().setAttribute("aria-activedescendant", node.id)
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      this.scrollToActive()
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      CodeMirror.signal(this.data, "select", this.data.list[this.selectedHint], node);
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    },
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    scrollToActive: function() {
420
      var selectedHintRange = this.getSelectedHintRange();
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      var node1 = this.hints.childNodes[selectedHintRange.from];
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      var node2 = this.hints.childNodes[selectedHintRange.to];
423
      var firstNode = this.hints.firstChild;
424
      if (node1.offsetTop < this.hints.scrollTop)
425
        this.hints.scrollTop = node1.offsetTop - firstNode.offsetTop;
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      else if (node2.offsetTop + node2.offsetHeight > this.hints.scrollTop + this.hints.clientHeight)
427
        this.hints.scrollTop = node2.offsetTop + node2.offsetHeight - this.hints.clientHeight + firstNode.offsetTop;
428
    },
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430
    screenAmount: function() {
431
      return Math.floor(this.hints.clientHeight / this.hints.firstChild.offsetHeight) || 1;
432
    },
433

434
    getSelectedHintRange: function() {
435
      var margin = this.completion.options.scrollMargin || 0;
436
      return {
437
        from: Math.max(0, this.selectedHint - margin),
438
        to: Math.min(this.data.list.length - 1, this.selectedHint + margin),
439
      };
440
    }
441
  };
442

443
  function applicableHelpers(cm, helpers) {
444
    if (!cm.somethingSelected()) return helpers
445
    var result = []
446
    for (var i = 0; i < helpers.length; i++)
447
      if (helpers[i].supportsSelection) result.push(helpers[i])
448
    return result
449
  }
450

451
  function fetchHints(hint, cm, options, callback) {
452
    if (hint.async) {
453
      hint(cm, callback, options)
454
    } else {
455
      var result = hint(cm, options)
456
      if (result && result.then) result.then(callback)
457
      else callback(result)
458
    }
459
  }
460

461
  function resolveAutoHints(cm, pos) {
462
    var helpers = cm.getHelpers(pos, "hint"), words
463
    if (helpers.length) {
464
      var resolved = function(cm, callback, options) {
465
        var app = applicableHelpers(cm, helpers);
466
        function run(i) {
467
          if (i == app.length) return callback(null)
468
          fetchHints(app[i], cm, options, function(result) {
469
            if (result && result.list.length > 0) callback(result)
470
            else run(i + 1)
471
          })
472
        }
473
        run(0)
474
      }
475
      resolved.async = true
476
      resolved.supportsSelection = true
477
      return resolved
478
    } else if (words = cm.getHelper(cm.getCursor(), "hintWords")) {
479
      return function(cm) { return CodeMirror.hint.fromList(cm, {words: words}) }
480
    } else if (CodeMirror.hint.anyword) {
481
      return function(cm, options) { return CodeMirror.hint.anyword(cm, options) }
482
    } else {
483
      return function() {}
484
    }
485
  }
486

487
  CodeMirror.registerHelper("hint", "auto", {
488
    resolve: resolveAutoHints
489
  });
490

491
  CodeMirror.registerHelper("hint", "fromList", function(cm, options) {
492
    var cur = cm.getCursor(), token = cm.getTokenAt(cur)
493
    var term, from = CodeMirror.Pos(cur.line, token.start), to = cur
494
    if (token.start < cur.ch && /\w/.test(token.string.charAt(cur.ch - token.start - 1))) {
495
      term = token.string.substr(0, cur.ch - token.start)
496
    } else {
497
      term = ""
498
      from = cur
499
    }
500
    var found = [];
501
    for (var i = 0; i < options.words.length; i++) {
502
      var word = options.words[i];
503
      if (word.slice(0, term.length) == term)
504
        found.push(word);
505
    }
506

507
    if (found.length) return {list: found, from: from, to: to};
508
  });
509

510
  CodeMirror.commands.autocomplete = CodeMirror.showHint;
511

512
  var defaultOptions = {
513
    hint: CodeMirror.hint.auto,
514
    completeSingle: true,
515
    alignWithWord: true,
516
    closeCharacters: /[\s()\[\]{};:>,]/,
517
    closeOnPick: true,
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    closeOnUnfocus: true,
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    updateOnCursorActivity: true,
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    completeOnSingleClick: true,
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    container: null,
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    customKeys: null,
523
    extraKeys: null,
524
    paddingForScrollbar: true,
525
    moveOnOverlap: true,
526
  };
527

528
  CodeMirror.defineOption("hintOptions", null);
529
});
530