/**
 * This code is mostly from the old Etherpad. Please help us to comment this code.
 * This helps other people to understand this code better and helps them to improve it.
 * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
 */

/**
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var hooks = require('./pluginfw/hooks');
var padutils = require('./pad_utils').padutils;
var padeditor = require('./pad_editor').padeditor;
var padsavedrevs = require('./pad_savedrevs');

var ToolbarItem = function (element) {
  this.$el = element;
};

ToolbarItem.prototype.getCommand = function () {
  return this.$el.attr("data-key");
};

ToolbarItem.prototype.getValue = function () {
  if (this.isSelect()) {
    return this.$el.find("select").val();
  }
};

ToolbarItem.prototype.setValue = function (val) {
  if (this.isSelect()) {
    return this.$el.find("select").val(val);
  }
};


ToolbarItem.prototype.getType = function () {
  return this.$el.attr("data-type");
};

ToolbarItem.prototype.isSelect = function () {
  return this.getType() == "select";
};

ToolbarItem.prototype.isButton = function () {
  return this.getType() == "button";
};

ToolbarItem.prototype.bind = function (callback) {
  var self = this;

  if (self.isButton()) {
    self.$el.click(function (event) {
      $(':focus').blur();
      callback(self.getCommand(), self);
      event.preventDefault();
    });
  }
  else if (self.isSelect()) {
    self.$el.find("select").change(function () {
      callback(self.getCommand(), self);
    });
  }
};


var padeditbar = (function()
{

  var syncAnimation = (function()
  {
    var SYNCING = -100;
    var DONE = 100;
    var state = DONE;
    var fps = 25;
    var step = 1 / fps;
    var T_START = -0.5;
    var T_FADE = 1.0;
    var T_GONE = 1.5;
    var animator = padutils.makeAnimationScheduler(function()
    {
      if (state == SYNCING || state == DONE)
      {
        return false;
      }
      else if (state >= T_GONE)
      {
        state = DONE;
        $("#syncstatussyncing").css('display', 'none');
        $("#syncstatusdone").css('display', 'none');
        return false;
      }
      else if (state < 0)
      {
        state += step;
        if (state >= 0)
        {
          $("#syncstatussyncing").css('display', 'none');
          $("#syncstatusdone").css('display', 'block').css('opacity', 1);
        }
        return true;
      }
      else
      {
        state += step;
        if (state >= T_FADE)
        {
          $("#syncstatusdone").css('opacity', (T_GONE - state) / (T_GONE - T_FADE));
        }
        return true;
      }
    }, step * 1000);
    return {
      syncing: function()
      {
        state = SYNCING;
        $("#syncstatussyncing").css('display', 'block');
        $("#syncstatusdone").css('display', 'none');
      },
      done: function()
      {
        state = T_START;
        animator.scheduleAnimation();
      }
    };
  }());

  var self = {
    init: function() {
      var self = this;
      self.dropdowns = [];
      // Listen for resize events (sucks but needed as iFrame ace_inner has to be position absolute
      // A CSS fix for this would be nice but I'm not sure how we'd do it.
      $(window).resize(function(){
        self.redrawHeight();
      });

      $("#editbar .editbarbutton").attr("unselectable", "on"); // for IE
      $("#editbar").removeClass("disabledtoolbar").addClass("enabledtoolbar");
      $("#editbar [data-key]").each(function () {
        $(this).unbind("click");
        (new ToolbarItem($(this))).bind(function (command, item) {
          self.triggerCommand(command, item);
        });
      });

      $('body:not(#editorcontainerbox)').on("keydown", function(evt){
        bodyKeyEvent(evt);
      });

      $('#editbar').show();

      this.redrawHeight();

      registerDefaultCommands(self);

      hooks.callAll("postToolbarInit", {
        toolbar: self,
        ace: padeditor.ace
      });
    },
    isEnabled: function()
    {
//      return !$("#editbar").hasClass('disabledtoolbar');
      return true;
    },
    disable: function()
    {
      $("#editbar").addClass('disabledtoolbar').removeClass("enabledtoolbar");
    },
    commands: {},
    registerCommand: function (cmd, callback) {
      this.commands[cmd] = callback;
      return this;
    },
    calculateEditbarHeight: function() {
      // if we're on timeslider, there is nothing on editbar, so we just use zero
      var onTimeslider = $('.menu_left').length === 0;
      if (onTimeslider) return 0;

      // if editbar has both menu left and right, its height must be
      // the max between the height of these two parts
      var leftMenuPosition = $('.menu_left').offset().top;
      var rightMenuPosition = $('.menu_right').offset().top;
      var editbarHasMenuLeftAndRight = (leftMenuPosition === rightMenuPosition);

      var height;
      if (editbarHasMenuLeftAndRight) {
        height = Math.max($('.menu_left').height(), $('.menu_right').height());
      }
      else {
        height = $('.menu_left').height();
      }

      return height;
    },
    redrawHeight: function(){
      var minimunEditbarHeight = self.calculateEditbarHeight();
      var editbarHeight = minimunEditbarHeight + 1 + "px";
      var containerTop = minimunEditbarHeight + 6 + "px";
      $('#editbar').css("height", editbarHeight);

      $('#editorcontainer').css("top", containerTop);

      // make sure pop ups are in the right place
      if($('#editorcontainer').offset()){
        $('.popup').css("top", $('#editorcontainer').offset().top + "px");
      }

      // If sticky chat is enabled..
      if($('#options-stickychat').is(":checked")){
        if($('#editorcontainer').offset()){
          $('#chatbox').css("top", $('#editorcontainer').offset().top + "px");
        }
      };

      // If chat and Users is enabled..
      if($('#options-chatandusers').is(":checked")){
        if($('#editorcontainer').offset()){
          $('#users').css("top", $('#editorcontainer').offset().top + "px");
        }
      }

    },
    registerDropdownCommand: function (cmd, dropdown) {
      dropdown = dropdown || cmd;
      self.dropdowns.push(dropdown)
      this.registerCommand(cmd, function () {
        self.toggleDropDown(dropdown);
      });
    },
    registerAceCommand: function (cmd, callback) {
      this.registerCommand(cmd, function (cmd, ace, item) {
        ace.callWithAce(function (ace) {
          callback(cmd, ace, item);
        }, cmd, true);
      });
    },
    triggerCommand: function (cmd, item) {
      if (self.isEnabled() && this.commands[cmd]) {
        this.commands[cmd](cmd, padeditor.ace, item);
      }
      if(padeditor.ace) padeditor.ace.focus();
    },
    toggleDropDown: function(moduleName, cb)
    {
      // hide all modules and remove highlighting of all buttons
      if(moduleName == "none")
      {
        var returned = false
        for(var i=0;i<self.dropdowns.length;i++)
        {
          //skip the userlist
          if(self.dropdowns[i] == "users")
            continue;

          var module = $("#" + self.dropdowns[i]);

          if(module.css('display') != "none")
          {
            $("li[data-key=" + self.dropdowns[i] + "] > a").removeClass("selected");
            module.slideUp("fast", cb);
            returned = true;
          }
        }
        if(!returned && cb) return cb();
      }
      else
      {
        // hide all modules that are not selected and remove highlighting
        // respectively add highlighting to the corresponding button
        for(var i=0;i<self.dropdowns.length;i++)
        {
          var module = $("#" + self.dropdowns[i]);

          if(module.css('display') != "none")
          {
            $("li[data-key=" + self.dropdowns[i] + "] > a").removeClass("selected");
            module.slideUp("fast");
          }
          else if(self.dropdowns[i]==moduleName)
          {
            $("li[data-key=" + self.dropdowns[i] + "] > a").addClass("selected");
            module.slideDown("fast", cb);
          }
        }
      }
    },
    setSyncStatus: function(status)
    {
      if (status == "syncing")
      {
        syncAnimation.syncing();
      }
      else if (status == "done")
      {
        syncAnimation.done();
      }
    },
    setEmbedLinks: function()
    {
      if ($('#readonlyinput').is(':checked'))
      {
        var basePath = document.location.href.substring(0, document.location.href.indexOf("/p/"));
        var readonlyLink = basePath + "/p/" + clientVars.readOnlyId;
        $('#embedinput').val('<iframe name="embed_readonly" src="' + readonlyLink + '?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false" width=600 height=400></iframe>');
        $('#linkinput').val(readonlyLink);
      }
      else
      {
        var padurl = window.location.href.split("?")[0];
        $('#embedinput').val('<iframe name="embed_readwrite" src="' + padurl + '?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false" width=600 height=400></iframe>');
        $('#linkinput').val(padurl);
      }
    }
  };

  var editbarPosition = 0;

  function bodyKeyEvent(evt){

    // If the event is Alt F9 or Escape & we're already in the editbar menu
    // Send the users focus back to the pad
    if((evt.keyCode === 120 && evt.altKey) || evt.keyCode === 27){
      if($(':focus').parents(".toolbar").length === 1){
        // If we're in the editbar already..
        // Close any dropdowns we have open..
        padeditbar.toggleDropDown("none");
        // Check we're on a pad and not on the timeslider
        // Or some other window I haven't thought about!
        if(typeof pad === 'undefined'){
          // Timeslider probably..
          // Shift focus away from any drop downs
          $(':focus').blur(); // required to do not try to remove!
          $('#padmain').focus(); // Focus back onto the pad
        }else{
          // Shift focus away from any drop downs
          $(':focus').blur(); // required to do not try to remove!
          padeditor.ace.focus(); // Sends focus back to pad
          // The above focus doesn't always work in FF, you have to hit enter afterwards
          evt.preventDefault();
        }
      }else{
        // Focus on the editbar :)
        var firstEditbarElement = parent.parent.$('#editbar').children("ul").first().children().first().children().first().children().first();
        $(this).blur();
        firstEditbarElement.focus();
        evt.preventDefault();
      }
    }
    // Are we in the toolbar??
    if($(':focus').parents(".toolbar").length === 1){
      // On arrow keys go to next/previous button item in editbar
      if(evt.keyCode !== 39 && evt.keyCode !== 37) return;

      // Get all the focusable items in the editbar
      var focusItems = $('#editbar').find('button, select');

      // On left arrow move to next button in editbar
      if(evt.keyCode === 37){
        // If a dropdown is visible or we're in an input don't move to the next button
        if($('.popup').is(":visible") || evt.target.localName === "input") return;

        editbarPosition--;
        // Allow focus to shift back to end of row and start of row
        if(editbarPosition === -1) editbarPosition = focusItems.length -1;
        $(focusItems[editbarPosition]).focus()
      }

      // On right arrow move to next button in editbar
      if(evt.keyCode === 39){
        // If a dropdown is visible or we're in an input don't move to the next button
        if($('.popup').is(":visible") || evt.target.localName === "input") return;

        editbarPosition++;
        // Allow focus to shift back to end of row and start of row
        if(editbarPosition >= focusItems.length) editbarPosition = 0;
        $(focusItems[editbarPosition]).focus();
      }
    }

  }

  function aceAttributeCommand(cmd, ace) {
    ace.ace_toggleAttributeOnSelection(cmd);
  }

  function registerDefaultCommands(toolbar) {
    toolbar.registerDropdownCommand("showusers", "users");
    toolbar.registerDropdownCommand("settings");
    toolbar.registerDropdownCommand("connectivity");
    toolbar.registerDropdownCommand("import_export");
    toolbar.registerDropdownCommand("embed");

    toolbar.registerCommand("settings", function () {
      toolbar.toggleDropDown("settings", function(){
        $('#options-stickychat').focus();
      });
    });

    toolbar.registerCommand("import_export", function () {
      toolbar.toggleDropDown("import_export", function(){
        // If Import file input exists then focus on it..
        if($('#importfileinput').length !== 0){
          setTimeout(function(){
            $('#importfileinput').focus();
          }, 100);
        }else{
          $('.exportlink').first().focus();
        }
      });
    });

    toolbar.registerCommand("showusers", function () {
      toolbar.toggleDropDown("users", function(){
        $('#myusernameedit').focus();
      });
    });

    toolbar.registerCommand("embed", function () {
      toolbar.setEmbedLinks();
      toolbar.toggleDropDown("embed", function(){
        $('#linkinput').focus().select();
      });
    });

    toolbar.registerCommand("savedRevision", function () {
      padsavedrevs.saveNow();
    });

    toolbar.registerCommand("showTimeSlider", function () {
      document.location = document.location.pathname+ '/timeslider';
    });

    toolbar.registerAceCommand("bold", aceAttributeCommand);
    toolbar.registerAceCommand("italic", aceAttributeCommand);
    toolbar.registerAceCommand("underline", aceAttributeCommand);
    toolbar.registerAceCommand("strikethrough", aceAttributeCommand);

    toolbar.registerAceCommand("undo", function (cmd, ace) {
      ace.ace_doUndoRedo(cmd);
    });

    toolbar.registerAceCommand("redo", function (cmd, ace) {
      ace.ace_doUndoRedo(cmd);
    });

    toolbar.registerAceCommand("insertunorderedlist", function (cmd, ace) {
      ace.ace_doInsertUnorderedList();
    });

    toolbar.registerAceCommand("insertorderedlist", function (cmd, ace) {
      ace.ace_doInsertOrderedList();
    });

    toolbar.registerAceCommand("indent", function (cmd, ace) {
      if (!ace.ace_doIndentOutdent(false)) {
        ace.ace_doInsertUnorderedList();
      }
    });

    toolbar.registerAceCommand("outdent", function (cmd, ace) {
      ace.ace_doIndentOutdent(true);
    });

    toolbar.registerAceCommand("clearauthorship", function (cmd, ace) {
      if ((!(ace.ace_getRep().selStart && ace.ace_getRep().selEnd)) || ace.ace_isCaret()) {
        if (window.confirm(html10n.get("pad.editbar.clearcolors"))) {
          ace.ace_performDocumentApplyAttributesToCharRange(0, ace.ace_getRep().alltext.length, [
            ['author', '']
          ]);
        }
      }
      else {
        ace.ace_setAttributeOnSelection('author', '');
      }
    });

    toolbar.registerCommand('timeslider_returnToPad', function(cmd) {
      if( document.referrer.length > 0 && document.referrer.substring(document.referrer.lastIndexOf("/")-1, document.referrer.lastIndexOf("/")) === "p") {
        document.location = document.referrer;
      } else {
        document.location = document.location.href.substring(0,document.location.href.lastIndexOf("/"));
      }
    });
  }

  return self;
}());

exports.padeditbar = padeditbar;