// Released under the MIT/X11 license
// http://www.opensource.org/licenses/mit-license.php
"use strict";
var bugURL = "https://bugzilla.redhat.com/show_bug.cgi?id=";
var BTSPrefNS = "bugzilla-triage.setting.";

// Shared contstants
var NumberOfFrames = 7;

// constants
var SalmonPink = new Color(255, 224, 176); // RGB 255, 224, 176; HSL 36, 2,
                       // 85
var ReporterColor = new Color(255, 255, 166); // RGB 255, 255, 166; HSL 60, 2,
                        // 83

// global variables
var config = {};
var constantData = {}; // This should be probably eliminated ASAP or
             // or done by other means. TODO
/**
* central handler processing messages from the main script.
*/
onMessage = function onMessage(msg) {
  console.log("onMessage - incoming : msg.cmd = " + msg.cmd);
  switch (msg.cmd) {
  case "ReloadThePage":
    document.location.reload(true);
    break;
  case "queryLocal":
    queryInNewTab(msg.data, getComponent(), getProduct());
    break;
  case "CreateButtons":
    constantData = msg.data.constData;
    config = msg.data.config;
    generateButtons(msg.data.instPkgs, msg.data.kNodes);
    break;
  case "Error":
    alert("Error " + msg.data);
    break;
  case "Unhandled":
    break;
  default:
    if (RHOnMessageHandler) {
      RHOnMessageHandler(msg);
    }
    else {
      console.error("Error: unknown RPC call " + msg.toSource());
    }
  }
};

/**
 * @param cmd Object with all commands to be executed
 *
 * PROBLEM: according to https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference\
 * /Statements/for...in there is no guaranteed order of execution of
 * commands (i.e., key, commentObj[key] pairs) in for..in cycle.
 * According to https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference\
 * /Operators/Special_Operators/delete_Operator#Cross-browser_issues it seems that
 * everywhere except of Internet Explorer this should work well, but waiting
 * impatiently when this bite us.
 */
function executeCommand(cmdObj) {
  for (var key in cmdObj) {
    centralCommandDispatch(key, cmdObj[key]);
  }
}

/**
 * Actual execution function
 *
 * @param cmdLabel String with the name of the command to be executed
 * @param cmdParams Object with the appropriate parameters for the command
 */
function centralCommandDispatch (cmdLabel, cmdParams) {
  console.log("centralCommandDispatch : cmdLabel = " + cmdLabel);
  switch (cmdLabel) {
  case "name":
  case "position":
    break;
  case "resolution":
  case "product":
  case "component":
  case "version":
  case "priority":
    selectOption(cmdLabel, cmdParams);
    break;
  case "status":
    selectOption("bug_status", cmdParams);
    break;
  case "platform":
    selectOption("rep_platform", cmdParams);
    break;
  case "os":
    selectOption("op_sys", cmdParams);
    break;
  case "severity":
    selectOption("bug_severity", cmdParams);
    break;
  case "target":
    selectOption("target_milestone", cmdParams);
    break;
  case "addKeyword":
    addStuffToTextBox("keywords",cmdParams);
    break;
  case "removeKeyword":
    removeStuffFromTextBox("keywords", cmdParams);
    break;
  case "addWhiteboard":
    addStuffToTextBox("status_whiteboard",cmdParams);
    break;
  case "removeWhiteboard":
    removeStuffFromTextBox("status_whiteboard",cmdParams);
    break;
  case "assignee":
    changeAssignee(cmdParams);
    break;
  case "qacontact":
    clickMouse("bz_qa_contact_edit_action");
    document.getElementById("qa_contact").value = cmdParams;
    break;
  case "url":
    clickMouse("bz_url_edit_action");
    document.getElementById("bug_file_loc").value = cmdParams;
    break;
  // TODO dependson/blocked doesn't work. Find out why.
  case "addDependsOn":
    clickMouse("dependson_edit_action");
    addStuffToTextBox("dependson", cmdParams);
    break;
  case "removeDependsOn":
    clickMouse("dependson_edit_action");
    removeStuffFromTextBox("dependson", cmdParams);
    break;
  case "addBlocks":
    clickMouse("blocked_edit_action");
    addStuffToTextBox("blocked", cmdParams);
    break;
  case "removeBlocks":
    clickMouse("blocked_edit_action");
    removeStuffFromTextBox("blocked", cmdParams);
    break;
  case "comment":
    addStuffToTextBox("comment", cmdParams);
    break;
  case "commentIdx":
    throw "There should be no commentIdx here at all.";
    break;
  case "setNeedinfo":
    // cmdParams are actually ignored for now; we may in future
    // distinguish different actors to be target of needinfo
    setNeedinfoReporter();
    break;
  case "addCC":
    addToCCList(cmdParams);
    break;
  case "queryStringOurBugzilla":
    queryForSelection();
    break;
  // TODO flags, see also
  case "commit":
    if (cmdParams) {
      // Directly commit the form
      document.forms.namedItem("changeform").submit();
    }
    break;
  default:
    if (RHcentralCommandDispatch) {
      RHcentralCommandDispatch(cmdLabel, cmdParams);
    }
    else {
      console.error("Unknown command:\n" + cmdLabel + "\nparameters:\n" + cmdParams);
    }
    break;
  }
}

/**
 * remove elements from the page based on their IDs
 *
 * @param doc Document object
 * @param target String/Array with ID(s)
 * @param remove Boolean indicating whether the node should be
 * actually removed or just hidden.
 * @return none
 * TODO remove parameter could be replaced by function which would
 * do actual activity.
 */
function killNodes(doc, target, remove) {
  var targetArr = target instanceof Array ? target : target.trim().split(/[,\s]+/);
  targetArr.forEach(function(x) {
    if (remove) {
      var targetNode = doc.getElementById(x);
      targetNode.parentNode.removeChild(targetNode);
    }
    else {
      x.style.display = "none";
    }
  });
}

/**
 * Change assignee of the bug
 *
 * @param newAssignee String with the email address of new assigneeAElement
 *    or 'default' if the component's default assignee should be used.
 *    Value null clears "Reset Assignee to default for component" checkbox
 * @return none
 */
function changeAssignee (newAssignee) {
  var defAssigneeButton = null;
  // Previous assignee should know what's going on in his bug
  addToCCList(getOwner());

  // Optional value null
  if (newAssignee === null) {
    document.getElementById("set_default_assignee").removeAttribute(
      "checked");
    return ;
  }

  if (getDefaultAssignee) {
    if (newAssignee === "default") {
      var defAss = getDefaultAssignee();
      if (defAss) {
        newAssignee = defAss;
      }
      else {
        return ;
      }
    }
  }

  if (newAssignee) {
    clickMouse("bz_assignee_edit_action");
    document.getElementById("assigned_to").value = newAssignee;
    document.getElementById("set_default_assignee").checked = false;
    defAssigneeButton = document.getElementById("defassignee_btn");
    if (defAssigneeButton) {
      defAssigneeButton.style.display = "none";
    }
  }
}

/**
 * Adds new option to the 'comment_action' scroll down box
 *
 * @param pkg String package name
 * @param cmd String with the name of the command
 * If the 'comment_action' scroll down box doesn't exist, this
 * function will set up new one.
 */
function addToCommentsDropdown (cmdObj) {
  var select = document.getElementById("comment_action");
  if (!select) {
    config.commandsList = [];
    document.getElementById("comments").innerHTML +=
      "<div id='make_bugzilla_comment_action'>" +
      "  <label for='comment_action'>Add Comment: </label>" +
      "  <select id='comment_action'>" +
      "  <option value=''>-- Select Comment from List --</option>" +
      "  </select>" +
      "</div>";
    select = document.getElementById("comment_action");
    select.addEventListener("change", function (evt) {
      var value = select.options[select.selectedIndex].value;
      executeCommand(config.commandsList[value]);
    }, false);
  }

  var opt = document.createElement("option");
  var objIdx = config.commandsList.length + 1;
  opt.value = objIdx;
  config.commandsList[objIdx] = cmdObj;
  opt.textContent = cmdObj.name;
  select.appendChild(opt);
}

/**
 * Generic function to add new button to the page. Actually copies new button
 * from the old one (in order to have the same look-and-feel, etc.
 *
 * @param location Object around which the new button will be added
 * @param after Boolean before or after location ?
 * @param pkg String which package to take the command from
 * @param id String which command to take
 * @return none
 */
function createNewButton (location, after, cmdObj) {
  try {
    var newId = cmdObj.name.toLowerCase().replace(/[^a-z0-9]+/,"","g") + "_btn";
  } catch (e) {
    console.error("createNewButton : e = " + e +
      "\ncreateNewButton : cmdObj.toSource() = " +
      cmdObj.toSource());
  }

  // protection against double-firings
  if (document.getElementById(newId)) {
    console.log("Element with id " + newId + " already exists!");
    return ;
  }

  var newButton = document.createElement("input");
  newButton.setAttribute("id", newId);
  newButton.setAttribute("type", "button");
  newButton.value = cmdObj.name;
  newButton.addEventListener("click", function(evt) {
    executeCommand(cmdObj);
  }, false);

  var originalLocation = document.getElementById(location);

  try {
    if (after) {
      originalLocation.parentNode.insertBefore(newButton,
          originalLocation.nextSibling);
      originalLocation.parentNode.insertBefore(document
          .createTextNode("\u00A0"), newButton);
    }
    else {
      originalLocation.parentNode.insertBefore(newButton, originalLocation);
      originalLocation.parentNode.insertBefore(document
          .createTextNode("\u00A0"), originalLocation);
    }
  } catch (e) {
    if (e instanceof TypeError) {
      console.error("cannot find originalLocation element with id " + location);
    }
    else {
      throw e;
    }
  }
}

/**
 * Generate button based on
 */
function generateButtons (pkgs, kNodes) {
  var topRowPosition = "topRowPositionID";
  var bottomRowPosition = "commit";

  // =========================================================
  if (kNodes && window.location.hostname in kNodes) {
      var killConf = kNodes[window.location.hostname];
      killNodes(document, killConf[0], killConf[1]);
  }

  // create anchor for the top toolbar
  var commentBox = document.getElementById("comment");
  var brElement = document.createElement("br");
  brElement.setAttribute("id",topRowPosition);
  commentBox.parentNode.normalize();
  commentBox.parentNode.insertBefore(brElement, commentBox);

  for (var pkg in pkgs) {
    for (var cmdIdx in pkgs[pkg]) {
      var cmdObj = pkgs[pkg][cmdIdx];
      if (cmdObj.position !== undefined) {
        switch (cmdObj.position) {
        case "topRow":
          createNewButton(topRowPosition, false, cmdObj);
          break;
        case "bottomRow":
          createNewButton(bottomRowPosition, false, cmdObj);
          break;
        case "dropDown":
          addToCommentsDropdown(cmdObj);
          break;
        default: // [+-]ID
          var firstChr = cmdObj.position.charAt(0);
          var newId = cmdObj.position.substr(1);
          createNewButton(newId, firstChr === "+", cmdObj);
          break;
        }
      }
      else {
        console.error("generateButtons : rejected cmdObj = " +
          cmdObj.toSource());
      }
    }
  }
  // TODO This is weird in this place, but that's the place where all constantData etc.
  // are finally defined and available.
  if (RHBZinit) {
    RHBZinit();
  }
}

function setConfigurationButton () {
  var additionalButtons = document.querySelector("#bugzilla-body *.related_actions");
  var configurationButtonUI = document.createElement("li");
  configurationButtonUI.innerHTML = "\u00A0-\u00A0<a href='' id='configurationButton'>"
    + "Triage configuration</a>";
  additionalButtons.appendChild(configurationButtonUI);
  document.getElementById("configurationButton").addEventListener(
    "click",
    function(evt) {
      postMessage(new Message("ChangeJSONURL", null));
      evt.stopPropagation();
      evt.preventDefault();
  }, false);
}

/**
 * Get the current title of the bug
 *
 * @return string
 */
function getSummary() {
  return document.getElementById("short_desc_nonedit_display").textContent;
}

/**
 * Get the current email of the reporter of the bug.
 *
 * @return string
 */
function getReporter () {
  var reporterElement = getOptionTableCell("bz_show_bug_column_2", "Reported");
  // RH Bugzilla after upgrade to 3.6.2 moved the information to other column
  if (!reporterElement) {
    reporterElement = getOptionTableCell("bz_show_bug_column_1", "Reported", true);
  }
  // Maemo calls the label "Reporter" and it doesn't have ids on table columns ... TODO(maemo)
  return parseMailto(reporterElement);
}

function getComponent() {
  var elem = document.getElementById("component");
  if (elem) {
    return elem.value;
  }
  return null;
}

function getProduct() {
  var elem = document.getElementById("product");
  if (elem) {
    return elem.value;
  }
  return null;
}

function commentsWalker (fce) {
  var comments = document.getElementById("comments").
    getElementsByClassName("bz_comment");
  Array.forEach(comments, function(item) {
    fce(item);
  });
}

/**
 * Set background color of all comments made by reporter in ReporterColor color
 *
 */
function checkComments () {
  var reporter = getReporter();
  commentsWalker(function(x) {
    var email = parseMailto(x.getElementsByClassName("vcard")[0]
        .getElementsByTagName("a")[0]);
    if (email.indexOf(reporter) != -1) {
      x.style.backgroundColor = ReporterColor.toString();
    }
  });
}

function collectComments () {
  var outStr = "";
  commentsWalker(function(x) {
    outStr += x.getElementsByTagName("pre")[0].textContent + "\n";
  });
  return outStr.trim();
}


/**
 * Select option with given value on the <SELECT> element with given id.
 *
 * Also execute change HTMLEvent, so that the form behaves accordingly.
 *
 * @param id
 * @param label
 * @return none
 *
 */
function selectOption (id, label, fireEvent) {
  if (!fireEvent) {
    fireEvent = true;
  }
  var sel = document.getElementById(id);
  sel.value = label;
  if (fireEvent) {
    var intEvent = document.createEvent("HTMLEvents");
    intEvent.initEvent("change", true, true);
    sel.dispatchEvent(intEvent);
  }
}

function selectOptionByLabel(id, label, fireEvent) {
  if (!fireEvent) {
    fireEvent = true;
  }
  var sel = document.getElementById(id);
  var labelRE = new RegExp(label.trim());
  var ourOption = Array.filter(sel.options, function (op) {
    return op.textContent.trim() === label;
  });

  if (ourOption[0]) {
    sel.value = ourOption[0].value;
  }

  if (fireEvent) {
    var intEvent = document.createEvent("HTMLEvents");
    intEvent.initEvent("change", true, true);
    sel.dispatchEvent(intEvent);
  }
}

/**
 * Send mouse click to the specified element
 *
 * @param String ID of the element to send mouseclick to
 * @return None
 */
function clickMouse (targetID) {
  var localEvent = document.createEvent("MouseEvents");
  localEvent.initMouseEvent("click", true, true, document.defaultView, 0, 0,
      0, 0, 0, false, false, false, false, 0, null);
  document.getElementById(targetID).dispatchEvent(localEvent);
}

/**
 * Add object to the text box (comment box or status whiteboard)
 *
 * @param id String with the id of the element
 * @param stuff String/Array to be added to the comment box
 *
 * @return none
 */
function addStuffToTextBox (id, stuff) {
  var textBox = document.getElementById(id);
  if (textBox.tagName.toLowerCase() === "textarea") {
    stuff = textBox.value ? "\n\n" + stuff : stuff;
    textBox.value += stuff;
  }
  else {
    textBox.value = addCSVValue(textBox.value,stuff);
  }
}

/**
 * Remove a keyword from the element if it is there
 *
 * @param id String with the id of the element
 * @param stuff String/Array with keyword(s) to be removed
 */
function removeStuffFromTextBox (id, stuff) {
  var changedElement = document.getElementById(id);
  changedElement.value = removeCSVValue(changedElement.value,stuff);
}

/**
 * generalized hasKeyword ... search in the value of the box with given id
 *
 * @param id String with ID of the element we want to check
 * @param str String to be searched for
 * @return Boolean found?
 */
function idContainsWord (id, str) {
  var kwd = "";
  try {
    kwd = document.getElementById(id).value;
  } catch (e) {
    // For those who don't have particular element at all or if it is empty
    return false;
  }
  return (isInList(str, kwd.trim().split(/[,\s]+/)));
}

/**
 * Check for the presence of a keyword
 *
 * @param str String with the keyword
 * @return Boolean
 */
function hasKeyword (str) {
  return (idContainsWord('keywords', str));
}

/**
 * dd
 *
 * @return Element with the href attribute containng the information
 */
function getOptionTableCell(tableId, label) {
  var cleanLabelRE = new RegExp("^\\s*([^.:]*):?\\s*$");
  label = label.trim().replace(cleanLabelRE,"$1").toLowerCase();

  var rows = document.getElementById(tableId).getElementsByTagName("tr");
  var ourLine = Array.filter(rows, function(row) {
    var curLabel = row.getElementsByTagName("td")[0].textContent.toLowerCase();
    curLabel = curLabel.replace(cleanLabelRE,"$1");
    return (curLabel === label); // maybe this could be a RE match instead
  });

  if (ourLine.length > 0) {
    return ourLine[0].getElementsByTagName("td")[1].
      getElementsByTagName("a")[0];
  }
  return null;
}

/**
 * Set the bug to NEEDINFO state
 *
 * Working function.
 * @return none
 * @todo TODO we may extend this to general setNeedinfo function
 * with parameter [reporter|assignee|general-email-address]
 */
function setNeedinfoReporter () {
  clickMouse("needinfo");
  selectOption("needinfo_role", "reporter");
}

/**
 *
 */
function getOwner () {
  // TODO(maemo) doesn't work on maemo
  var assigneeAElement = getOptionTableCell("bz_show_bug_column_1","Assigned To");
  return parseMailto(assigneeAElement);
}

/**
 * Return maintainer which is per default by bugzilla
 * (which is not necessarily the one who is default maintainer per component)
 *
 * @return String with the maintainer's email address
 */
function getDefaultBugzillaMaintainer (component) {
  var address = filterByRegexp(constantData.defBugzillaMaintainerArr, component);
  return address;
}

/**
 * Parse the row with the attachment
 *
 * @param DOM element to be parsed
 * @return array with string name of the attachment, integer its id number,
 *     string of MIME type, integer of size in kilobytes, and the whole
 *     element itself
 *
 * TODO error handling is missing ... it's bleee
 */
function parseAttachmentLine(inElem) {
  var MIMEtype = "";
  var size = 0;

  // Skip over obsolete attachments
  if (inElem.getElementsByClassName("bz_obsolete").length > 0) {
    return ([]);
  }

  // getting name of the attachment
  var attName = inElem.getElementsByTagName("b")[0].textContent.trim();

  // TODO probably could use url.URL object
  var aHrefsArr = inElem.getElementsByTagName("a");
  var aHref = Array.filter(aHrefsArr, function(x) {
    return x.textContent.trim() === "Details";
  })[0];
  var id = parseURL(aHref.getAttribute("href")).params.id;

  // getting MIME type and size
  var stringArray = inElem.getElementsByClassName("bz_attach_extra_info")[0].textContent.
      replace(/[\n ()]+/g, " ").trim().split(", ");
  size = parseInt(stringArray[0], 10);
  MIMEtype = stringArray[1].split(" ")[0];

  return [ attName, id, MIMEtype, size, inElem ];
}

/**
 * collect the list of attachments in a structured format
 *
 * @return Array of arrays, one for each attachments;
 * each record has string name of the attachment, integer its id number,
 *     string of MIME type, integer of size in kilobytes, and the whole
 *     element itself
 */
function getAttachments () {
  var outAtts = [];
  var atts = document.getElementById("attachment_table").
      getElementsByTagName("tr");
  for ( var i = 1, ii = atts.length - 1; i < ii; i++) {
    outAtts.push(parseAttachmentLine(atts[i]));
  }
  return outAtts;
}

/**
 * Get login of the currently logged-in user.
 *
 * @return String with the login name of the currently logged-in user
 */
function getLogin () {
  var lastLIElement = document.querySelector("#header ul.links li:last-of-type");
  var loginArr = lastLIElement.textContent.split("\n");
  var loginStr = loginArr[loginArr.length - 1].trim();
  return loginStr;
}

function getSelection () {
  var text = "";
  var selectionObject = window.getSelection();
  if (selectionObject.rangeCount > 0) {
    text = selectionObject.getRangeAt(0).toString().trim();
  }
  return text;
}

/**
 * Opens a new tab with a query for the given text in the selected component
 *
 * @param text to be searched for
 * @param component String with the component name (maybe latter regexp?)
 * @param product (optional) string with the product name, if undefined,
 *    search in all products
 * @return None
 * 
 */
function queryInNewTab(text, component, product) {
  var urlStr = "https://" + window.location.hostname + "/buglist.cgi?query_format=advanced";
  if (product) {
    urlStr += "&product=" + product.trim();
  }
  if (component) {
    if ("equivalentComponents" in constantData) {
      var equivCompsArr = constantData.equivalentComponents.
        filter(function (REstr) {
          return new RegExp(REstr).test(getComponent());
      }, this);
      if (equivCompsArr.length > 0) {
        component = equivCompsArr[0];
      }
    }
    urlStr += "&component=" + component.trim();
  }

  // using more complicated query tables here, because they can be more easily
  // edited
  // for further investigative searches
  if (text) {
    text = encodeURIComponent(text.trim());
    var searchText = "&field0-0-0=longdesc&type0-0-0=substring&value0-0-0="
        + text
        + "&field0-0-1=attach_data.thedata&type0-0-1=substring&value0-0-1="
        + text
        + "&field0-0-2=status_whiteboard&type0-0-2=substring&value0-0-2="
        + text;
    urlStr += searchText;
    postMessage(new Message("OpenURLinTab", urlStr));
  }
}

/**
 * Get the text to search for and prepare other things for the real executive
 * function this.queryInNewTab, and run it.
 */
function queryForSelection() {
  var text = getSelection();
  if (!text) {
    postMessage(new Message("GetClipboard", "queryLocal"));
  }
  else {
    queryInNewTab(text, getComponent(), getProduct());
  }
}

/**
 * adds a person to the CC list, if it isn't already there
 *
 * @param who String with email address or "self" if the current user
 * of the bugzilla should be added
 */
function addToCCList (who) {
  if (!who) {
    return ;
  }
  if (who === "self") {
    document.getElementById("addselfcc").checked = true;
  }
  else {
    clickMouse("cc_edit_area_showhide");
    if (!isInList(who, getCCList())) {
      addStuffToTextBox("newcc",who);
    }
  }
}

/**
 * a collect a list of emails on CC list
 *
 * @return Array with email addresses as Strings.
 */
function getCCList () {
  var CCListSelect = document.getElementById("cc");
  var outCCList = [];
  if (CCListSelect) {
    outCCList = Array.map(CCListSelect.options, function(item) {
      return item.value;
    });
  }
  return outCCList;
}

function startup() {
  // First, preflight check ... if we are not logged in, there
  // is nothing we can do.
  var logoutLink = Array.some(document.links, function (x) {
    return x.search === "?logout=1" ;
  });
  if (!logoutLink) {
    return null; // This should just finish whole content script without
    // doing any harm to anybody.
  }

  // Prepare for query buttons
  // element ID brElementPlace_location is later used in JSON files
  // Stay with this add_comment element even if RH BZ upgrades, this seems
  // to be generally much more stable (even with other bugzillas, e.g. b.gnome.org)
  // then some getElementById.
  var commentArea = document.getElementsByName("add_comment")[0].parentNode;
  if (commentArea) {
    var brElementPlacer = commentArea.getElementsByTagName("br");
    brElementPlacer = brElementPlacer[0];
    if (brElementPlacer) {
      brElementPlacer.setAttribute("id","brElementPlacer_location");
      brElementPlacer.parentNode.insertBefore(document.createElement("br"),
        brElementPlacer);
    }
  }

  // TODO Probably could be ignored ... used only once on line 973 of rhbzpage.js
  // if (parseAbrtBacktraces && this.RE.Abrt.test(getSummary())) {
  // title = document.getElementById("short_desc_nonedit_display").textContent;

  // So, now we know we are logged in, so we can get to
  // the real work.
  setConfigurationButton();
  submitHandlerInstalled = false;

  checkComments();

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