/**
 * 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 padutils = require('./pad_utils').padutils;
var hooks = require('./pluginfw/hooks');

var myUserInfo = {};

var colorPickerOpen = false;
var colorPickerSetup = false;
var previousColorId = 0;


var paduserlist = (function()
{

  var rowManager = (function()
  {
    // The row manager handles rendering rows of the user list and animating
    // their insertion, removal, and reordering.  It manipulates TD height
    // and TD opacity.

    function nextRowId()
    {
      return "usertr" + (nextRowId.counter++);
    }
    nextRowId.counter = 1;
    // objects are shared; fields are "domId","data","animationStep"
    var rowsFadingOut = []; // unordered set
    var rowsFadingIn = []; // unordered set
    var rowsPresent = []; // in order
    var ANIMATION_START = -12; // just starting to fade in
    var ANIMATION_END = 12; // just finishing fading out


    function getAnimationHeight(step, power)
    {
      var a = Math.abs(step / 12);
      if (power == 2) a = a * a;
      else if (power == 3) a = a * a * a;
      else if (power == 4) a = a * a * a * a;
      else if (power >= 5) a = a * a * a * a * a;
      return Math.round(26 * (1 - a));
    }
    var OPACITY_STEPS = 6;

    var ANIMATION_STEP_TIME = 20;
    var LOWER_FRAMERATE_FACTOR = 2;
    var scheduleAnimation = padutils.makeAnimationScheduler(animateStep, ANIMATION_STEP_TIME, LOWER_FRAMERATE_FACTOR).scheduleAnimation;

    var NUMCOLS = 4;

    // we do lots of manipulation of table rows and stuff that JQuery makes ok, despite
    // IE's poor handling when manipulating the DOM directly.

    function getEmptyRowHtml(height)
    {
      return '<td colspan="' + NUMCOLS + '" style="border:0;height:' + height + 'px"><!-- --></td>';
    }

    function isNameEditable(data)
    {
      return (!data.name) && (data.status != 'Disconnected');
    }

    function replaceUserRowContents(tr, height, data)
    {
      var tds = getUserRowHtml(height, data).match(/<td.*?<\/td>/gi);
      if (isNameEditable(data) && tr.find("td.usertdname input:enabled").length > 0)
      {
        // preserve input field node
        for (var i = 0; i < tds.length; i++)
        {
          var oldTd = $(tr.find("td").get(i));
          if (!oldTd.hasClass('usertdname'))
          {
            oldTd.replaceWith(tds[i]);
          }
        }
      }
      else
      {
        tr.html(tds.join(''));
      }
      return tr;
    }

    function getUserRowHtml(height, data)
    {
      var nameHtml;
      if (data.name)
      {
        nameHtml = padutils.escapeHtml(data.name);
      }
      else
      {
        nameHtml = '<input data-l10n-id="pad.userlist.unnamed" type="text" class="editempty newinput" value="'+_('pad.userlist.unnamed')+'" ' + (isNameEditable(data) ? '' : 'disabled="disabled" ') + '/>';
      }

      return ['<td style="height:', height, 'px" class="usertdswatch"><div class="swatch" style="background:' + padutils.escapeHtml(data.color) + '">&nbsp;</div></td>', '<td style="height:', height, 'px" class="usertdname">', nameHtml, '</td>', '<td style="height:', height, 'px" class="activity">', padutils.escapeHtml(data.activity), '</td>'].join('');
    }

    function getRowHtml(id, innerHtml, authorId)
    {
      return '<tr data-authorId="'+authorId+'" id="' + id + '">' + innerHtml + '</tr>';
    }

    function rowNode(row)
    {
      return $("#" + row.domId);
    }

    function handleRowData(row)
    {
      if (row.data && row.data.status == 'Disconnected')
      {
        row.opacity = 0.5;
      }
      else
      {
        delete row.opacity;
      }
    }

    function handleRowNode(tr, data)
    {
      if (data.titleText)
      {
        var titleText = data.titleText;
        window.setTimeout(function()
        {
          /* tr.attr('title', titleText)*/
        }, 0);
      }
      else
      {
        tr.removeAttr('title');
      }
    }

    function handleOtherUserInputs()
    {
      // handle 'INPUT' elements for naming other unnamed users
      $("#otheruserstable input.newinput").each(function()
      {
        var input = $(this);
        var tr = input.closest("tr");
        if (tr.length > 0)
        {
          var index = tr.parent().children().index(tr);
          if (index >= 0)
          {
            var userId = rowsPresent[index].data.id;
            rowManagerMakeNameEditor($(this), userId);
          }
        }
      }).removeClass('newinput');
    }

    // animationPower is 0 to skip animation, 1 for linear, 2 for quadratic, etc.


    function insertRow(position, data, animationPower)
    {
      position = Math.max(0, Math.min(rowsPresent.length, position));
      animationPower = (animationPower === undefined ? 4 : animationPower);

      var domId = nextRowId();
      var row = {
        data: data,
        animationStep: ANIMATION_START,
        domId: domId,
        animationPower: animationPower
      };
      var authorId = data.id;

      handleRowData(row);
      rowsPresent.splice(position, 0, row);
      var tr;
      if (animationPower == 0)
      {
        tr = $(getRowHtml(domId, getUserRowHtml(getAnimationHeight(0), data), authorId));
        row.animationStep = 0;
      }
      else
      {
        rowsFadingIn.push(row);
        tr = $(getRowHtml(domId, getEmptyRowHtml(getAnimationHeight(ANIMATION_START)), authorId));
      }
      handleRowNode(tr, data);
      if (position == 0)
      {
        $("table#otheruserstable").prepend(tr);
      }
      else
      {
        rowNode(rowsPresent[position - 1]).after(tr);
      }

      if (animationPower != 0)
      {
        scheduleAnimation();
      }

      handleOtherUserInputs();

      return row;
    }

    function updateRow(position, data)
    {
      var row = rowsPresent[position];
      if (row)
      {
        row.data = data;
        handleRowData(row);
        if (row.animationStep == 0)
        {
          // not currently animating
          var tr = rowNode(row);
          replaceUserRowContents(tr, getAnimationHeight(0), row.data).find("td").css('opacity', (row.opacity === undefined ? 1 : row.opacity));
          handleRowNode(tr, data);
          handleOtherUserInputs();
        }
      }
    }

    function removeRow(position, animationPower)
    {
      animationPower = (animationPower === undefined ? 4 : animationPower);
      var row = rowsPresent[position];
      if (row)
      {
        rowsPresent.splice(position, 1); // remove
        if (animationPower == 0)
        {
          rowNode(row).remove();
        }
        else
        {
          row.animationStep = -row.animationStep; // use symmetry
          row.animationPower = animationPower;
          rowsFadingOut.push(row);
          scheduleAnimation();
        }
      }
    }

    // newPosition is position after the row has been removed


    function moveRow(oldPosition, newPosition, animationPower)
    {
      animationPower = (animationPower === undefined ? 1 : animationPower); // linear is best
      var row = rowsPresent[oldPosition];
      if (row && oldPosition != newPosition)
      {
        var rowData = row.data;
        removeRow(oldPosition, animationPower);
        insertRow(newPosition, rowData, animationPower);
      }
    }

    function animateStep()
    {
      // animation must be symmetrical
      for (var i = rowsFadingIn.length - 1; i >= 0; i--)
      { // backwards to allow removal
        var row = rowsFadingIn[i];
        var step = ++row.animationStep;
        var animHeight = getAnimationHeight(step, row.animationPower);
        var node = rowNode(row);
        var baseOpacity = (row.opacity === undefined ? 1 : row.opacity);
        if (step <= -OPACITY_STEPS)
        {
          node.find("td").height(animHeight);
        }
        else if (step == -OPACITY_STEPS + 1)
        {
          node.html(getUserRowHtml(animHeight, row.data)).find("td").css('opacity', baseOpacity * 1 / OPACITY_STEPS);
          handleRowNode(node, row.data);
        }
        else if (step < 0)
        {
          node.find("td").css('opacity', baseOpacity * (OPACITY_STEPS - (-step)) / OPACITY_STEPS).height(animHeight);
        }
        else if (step == 0)
        {
          // set HTML in case modified during animation
          node.html(getUserRowHtml(animHeight, row.data)).find("td").css('opacity', baseOpacity * 1).height(animHeight);
          handleRowNode(node, row.data);
          rowsFadingIn.splice(i, 1); // remove from set
        }
      }
      for (var i = rowsFadingOut.length - 1; i >= 0; i--)
      { // backwards to allow removal
        var row = rowsFadingOut[i];
        var step = ++row.animationStep;
        var node = rowNode(row);
        var animHeight = getAnimationHeight(step, row.animationPower);
        var baseOpacity = (row.opacity === undefined ? 1 : row.opacity);
        if (step < OPACITY_STEPS)
        {
          node.find("td").css('opacity', baseOpacity * (OPACITY_STEPS - step) / OPACITY_STEPS).height(animHeight);
        }
        else if (step == OPACITY_STEPS)
        {
          node.html(getEmptyRowHtml(animHeight));
        }
        else if (step <= ANIMATION_END)
        {
          node.find("td").height(animHeight);
        }
        else
        {
          rowsFadingOut.splice(i, 1); // remove from set
          node.remove();
        }
      }

      handleOtherUserInputs();

      return (rowsFadingIn.length > 0) || (rowsFadingOut.length > 0); // is more to do
    }

    var self = {
      insertRow: insertRow,
      removeRow: removeRow,
      moveRow: moveRow,
      updateRow: updateRow
    };
    return self;
  }()); ////////// rowManager
  var otherUsersInfo = [];
  var otherUsersData = [];

  function rowManagerMakeNameEditor(jnode, userId)
  {
    setUpEditable(jnode, function()
    {
      var existingIndex = findExistingIndex(userId);
      if (existingIndex >= 0)
      {
        return otherUsersInfo[existingIndex].name || '';
      }
      else
      {
        return '';
      }
    }, function(newName)
    {
      if (!newName)
      {
        jnode.addClass("editempty");
        jnode.val(_('pad.userlist.unnamed'));
      }
      else
      {
        jnode.attr('disabled', 'disabled');
        pad.suggestUserName(userId, newName);
      }
    });
  }

  function findExistingIndex(userId)
  {
    var existingIndex = -1;
    for (var i = 0; i < otherUsersInfo.length; i++)
    {
      if (otherUsersInfo[i].userId == userId)
      {
        existingIndex = i;
        break;
      }
    }
    return existingIndex;
  }

  function setUpEditable(jqueryNode, valueGetter, valueSetter)
  {
    jqueryNode.bind('focus', function(evt)
    {
      var oldValue = valueGetter();
      if (jqueryNode.val() !== oldValue)
      {
        jqueryNode.val(oldValue);
      }
      jqueryNode.addClass("editactive").removeClass("editempty");
    });
    jqueryNode.bind('blur', function(evt)
    {
      var newValue = jqueryNode.removeClass("editactive").val();
      valueSetter(newValue);
    });
    padutils.bindEnterAndEscape(jqueryNode, function onEnter()
    {
      jqueryNode.blur();
    }, function onEscape()
    {
      jqueryNode.val(valueGetter()).blur();
    });
    jqueryNode.removeAttr('disabled').addClass('editable');
  }

  function updateInviteNotice()
  {
    if (otherUsersInfo.length == 0)
    {
      $("#otheruserstable").hide();
      $("#nootherusers").show();
    }
    else
    {
      $("#nootherusers").hide();
      $("#otheruserstable").show();
    }
  }

  var knocksToIgnore = {};
  var guestPromptFlashState = 0;
  var guestPromptFlash = padutils.makeAnimationScheduler(

  function()
  {
    var prompts = $("#guestprompts .guestprompt");
    if (prompts.length == 0)
    {
      return false; // no more to do
    }

    guestPromptFlashState = 1 - guestPromptFlashState;
    if (guestPromptFlashState)
    {
      prompts.css('background', '#ffa');
    }
    else
    {
      prompts.css('background', '#ffe');
    }

    return true;
  }, 1000);

  var pad = undefined;
  var self = {
    init: function(myInitialUserInfo, _pad)
    {
      pad = _pad;

      self.setMyUserInfo(myInitialUserInfo);

      $("#otheruserstable tr").remove();

      if (pad.getUserIsGuest())
      {
        $("#myusernameedit").addClass('myusernameedithoverable');
        setUpEditable($("#myusernameedit"), function()
        {
          return myUserInfo.name || '';
        }, function(newValue)
        {
          myUserInfo.name = newValue;
          pad.notifyChangeName(newValue);
          // wrap with setTimeout to do later because we get
          // a double "blur" fire in IE...
          window.setTimeout(function()
          {
            self.renderMyUserInfo();
          }, 0);
        });
      }

      // color picker
      $("#myswatchbox").click(showColorPicker);
      $("#mycolorpicker .pickerswatchouter").click(function()
      {
        $("#mycolorpicker .pickerswatchouter").removeClass('picked');
        $(this).addClass('picked');
      });
      $("#mycolorpickersave").click(function()
      {
        closeColorPicker(true);
      });
      $("#mycolorpickercancel").click(function()
      {
        closeColorPicker(false);
      });
      //
    },
    setMyUserInfo: function(info)
    {
      //translate the colorId
      if(typeof info.colorId == "number")
      {
        info.colorId = clientVars.colorPalette[info.colorId];
      }
      
      myUserInfo = $.extend(
      {}, info);

      self.renderMyUserInfo();
    },
    userJoinOrUpdate: function(info)
    {
      if ((!info.userId) || (info.userId == myUserInfo.userId))
      {
        // not sure how this would happen
        return;
      }

      hooks.callAll('userJoinOrUpdate', {
        userInfo: info
      });

      var userData = {};
      userData.color = typeof info.colorId == "number" ? clientVars.colorPalette[info.colorId] : info.colorId;
      userData.name = info.name;
      userData.status = '';
      userData.activity = '';
      userData.id = info.userId;
      // Firefox ignores \n in title text; Safari does a linebreak
      userData.titleText = [info.userAgent || '', info.ip || ''].join(' \n');

      var existingIndex = findExistingIndex(info.userId);

      var numUsersBesides = otherUsersInfo.length;
      if (existingIndex >= 0)
      {
        numUsersBesides--;
      }
      var newIndex = padutils.binarySearch(numUsersBesides, function(n)
      {
        if (existingIndex >= 0 && n >= existingIndex)
        {
          // pretend existingIndex isn't there
          n++;
        }
        var infoN = otherUsersInfo[n];
        var nameN = (infoN.name || '').toLowerCase();
        var nameThis = (info.name || '').toLowerCase();
        var idN = infoN.userId;
        var idThis = info.userId;
        return (nameN > nameThis) || (nameN == nameThis && idN > idThis);
      });

      if (existingIndex >= 0)
      {
        // update
        if (existingIndex == newIndex)
        {
          otherUsersInfo[existingIndex] = info;
          otherUsersData[existingIndex] = userData;
          rowManager.updateRow(existingIndex, userData);
        }
        else
        {
          otherUsersInfo.splice(existingIndex, 1);
          otherUsersData.splice(existingIndex, 1);
          otherUsersInfo.splice(newIndex, 0, info);
          otherUsersData.splice(newIndex, 0, userData);
          rowManager.updateRow(existingIndex, userData);
          rowManager.moveRow(existingIndex, newIndex);
        }
      }
      else
      {
        otherUsersInfo.splice(newIndex, 0, info);
        otherUsersData.splice(newIndex, 0, userData);
        rowManager.insertRow(newIndex, userData);
      }

      updateInviteNotice();

      self.updateNumberOfOnlineUsers();
    },
    updateNumberOfOnlineUsers: function()
    {
      var online = 1; // you are always online!
      for (var i = 0; i < otherUsersData.length; i++)
      {
        if (otherUsersData[i].status == "")
        {
          online++;
        }
      }
      $("#online_count").text(online);

      return online;
    },
    userLeave: function(info)
    {
      var existingIndex = findExistingIndex(info.userId);
      if (existingIndex >= 0)
      {
        var userData = otherUsersData[existingIndex];
        userData.status = 'Disconnected';
        rowManager.updateRow(existingIndex, userData);
        if (userData.leaveTimer)
        {
          window.clearTimeout(userData.leaveTimer);
        }
        // set up a timer that will only fire if no leaves,
        // joins, or updates happen for this user in the
        // next N seconds, to remove the user from the list.
        var thisUserId = info.userId;
        var thisLeaveTimer = window.setTimeout(function()
        {
          var newExistingIndex = findExistingIndex(thisUserId);
          if (newExistingIndex >= 0)
          {
            var newUserData = otherUsersData[newExistingIndex];
            if (newUserData.status == 'Disconnected' && newUserData.leaveTimer == thisLeaveTimer)
            {
              otherUsersInfo.splice(newExistingIndex, 1);
              otherUsersData.splice(newExistingIndex, 1);
              rowManager.removeRow(newExistingIndex);
              hooks.callAll('userLeave', {
                userInfo: info
              });
              updateInviteNotice();
            }
          }
        }, 8000); // how long to wait
        userData.leaveTimer = thisLeaveTimer;
      }
      updateInviteNotice();

      self.updateNumberOfOnlineUsers();
    },
    showGuestPrompt: function(userId, displayName)
    {
      if (knocksToIgnore[userId])
      {
        return;
      }

      var encodedUserId = padutils.encodeUserId(userId);

      var actionName = 'hide-guest-prompt-' + encodedUserId;
      padutils.cancelActions(actionName);

      var box = $("#guestprompt-" + encodedUserId);
      if (box.length == 0)
      {
        // make guest prompt box
        box = $('<div id="'+padutils.escapeHtml('guestprompt-' + encodedUserId) + '" class="guestprompt"><div class="choices"><a href="' + padutils.escapeHtml('javascript:void(require('+JSON.stringify(module.id)+').paduserlist.answerGuestPrompt(' + JSON.stringify(encodedUserId) + ',false))')+'">'+_('pad.userlist.deny')+'</a> <a href="' + padutils.escapeHtml('javascript:void(require('+JSON.stringify(module.id)+').paduserlist.answerGuestPrompt(' + JSON.stringify(encodedUserId) + ',true))') + '">'+_('pad.userlist.approve')+'</a></div><div class="guestname"><strong>'+_('pad.userlist.guest')+':</strong> ' + padutils.escapeHtml(displayName) + '</div></div>');
        $("#guestprompts").append(box);
      }
      else
      {
        // update display name
        box.find(".guestname").html('<strong>'+_('pad.userlist.guest')+':</strong> ' + padutils.escapeHtml(displayName));
      }
      var hideLater = padutils.getCancellableAction(actionName, function()
      {
        self.removeGuestPrompt(userId);
      });
      window.setTimeout(hideLater, 15000); // time-out with no knock
      guestPromptFlash.scheduleAnimation();
    },
    removeGuestPrompt: function(userId)
    {
      var box = $("#guestprompt-" + padutils.encodeUserId(userId));
      // remove ID now so a new knock by same user gets new, unfaded box
      box.removeAttr('id').fadeOut("fast", function()
      {
        box.remove();
      });

      knocksToIgnore[userId] = true;
      window.setTimeout(function()
      {
        delete knocksToIgnore[userId];
      }, 5000);
    },
    answerGuestPrompt: function(encodedUserId, approve)
    {
      var guestId = padutils.decodeUserId(encodedUserId);

      var msg = {
        type: 'guestanswer',
        authId: pad.getUserId(),
        guestId: guestId,
        answer: (approve ? "approved" : "denied")
      };
      pad.sendClientMessage(msg);

      self.removeGuestPrompt(guestId);
    },
    renderMyUserInfo: function()
    {
      if (myUserInfo.name)
      {
        $("#myusernameedit").removeClass("editempty").val(myUserInfo.name);
      }
      else
      {
        $("#myusernameedit").addClass("editempty").val(_("pad.userlist.entername"));
      }
      if (colorPickerOpen)
      {
        $("#myswatchbox").addClass('myswatchboxunhoverable').removeClass('myswatchboxhoverable');
      }
      else
      {
        $("#myswatchbox").addClass('myswatchboxhoverable').removeClass('myswatchboxunhoverable');
      }
      
      $("#myswatch").css({'background-color': myUserInfo.colorId});
      
      if ($.browser.msie && parseInt($.browser.version) <= 8) {
        $("#usericon a").css({'box-shadow': 'inset 0 0 30px ' + myUserInfo.colorId,'background-color': myUserInfo.colorId});
      }
      else
      {
        $("#usericon a").css({'box-shadow': 'inset 0 0 30px ' + myUserInfo.colorId});
      }
    }
  };
  return self;
}());

function getColorPickerSwatchIndex(jnode)
{
  //  return Number(jnode.get(0).className.match(/\bn([0-9]+)\b/)[1])-1;
  return $("#colorpickerswatches li").index(jnode);
}

function closeColorPicker(accept)
{
  if (accept)
  {    
    var newColor = $("#mycolorpickerpreview").css("background-color");
    var parts = newColor.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    // parts now should be ["rgb(0, 70, 255", "0", "70", "255"]
    if (parts) {
      delete (parts[0]);
      for (var i = 1; i <= 3; ++i) {
          parts[i] = parseInt(parts[i]).toString(16);
          if (parts[i].length == 1) parts[i] = '0' + parts[i];
      }
      var newColor = "#" +parts.join(''); // "0070ff"
    }
    myUserInfo.colorId = newColor;
    pad.notifyChangeColor(newColor);
    paduserlist.renderMyUserInfo();
  }
  else
  {
    //pad.notifyChangeColor(previousColorId);
    //paduserlist.renderMyUserInfo();
  }

  colorPickerOpen = false;
  $("#mycolorpicker").fadeOut("fast");
}

function showColorPicker()
{
  previousColorId = myUserInfo.colorId;

  if (!colorPickerOpen)
  {
    var palette = pad.getColorPalette();

    if (!colorPickerSetup)
    {
      var colorsList = $("#colorpickerswatches")
      for (var i = 0; i < palette.length; i++)
      {

        var li = $('<li>', {
          style: 'background: ' + palette[i] + ';'
        });

        li.appendTo(colorsList);

        li.bind('click', function(event)
        {
          $("#colorpickerswatches li").removeClass('picked');
          $(event.target).addClass("picked");

          var newColorId = getColorPickerSwatchIndex($("#colorpickerswatches .picked"));
          pad.notifyChangeColor(newColorId);
        });

      }

      colorPickerSetup = true;
    }

    $("#mycolorpicker").fadeIn();
    colorPickerOpen = true;

    $("#colorpickerswatches li").removeClass('picked');
    $($("#colorpickerswatches li")[myUserInfo.colorId]).addClass("picked"); //seems weird
  }
}

exports.paduserlist = paduserlist;