/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*** =================== INITIALISATION CODE =================== ***/

var { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;

Components.utils.import("resource://gre/modules/Services.jsm");

var kObserverService;

// interface variables
var passwordmanager     = null;

// password-manager lists
var signons             = [];
var rejects             = [];
var deletedSignons      = [];
var deletedRejects      = [];

var signonsTree;
var rejectsTree;

var showingPasswords = false;

function Startup() {
  // xpconnect to password manager interfaces
  passwordmanager = Components.classes["@mozilla.org/login-manager;1"]
                        .getService(Components.interfaces.nsILoginManager);

  // be prepared to reload the display if anything changes
  kObserverService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
  kObserverService.addObserver(signonReloadDisplay, "passwordmgr-storage-changed", false);

  signonsTree = document.getElementById("signonsTree");
  rejectsTree = document.getElementById("rejectsTree");
}

function Shutdown() {
  kObserverService.removeObserver(signonReloadDisplay, "passwordmgr-storage-changed");
}

var signonReloadDisplay = {
  observe: function(subject, topic, data) {
    if (topic == "passwordmgr-storage-changed") {
      switch (data) {
        case "addLogin":
        case "modifyLogin":
        case "removeLogin":
        case "removeAllLogins":
          if (!signonsTree) {
            return;
          }
          signons.length = 0;
          LoadSignons();
          // apply the filter if needed
          if (document.getElementById("filter") && document.getElementById("filter").value != "") {
            _filterPasswords();
          }
          break;
        case "hostSavingEnabled":
        case "hostSavingDisabled":
          if (!rejectsTree) {
            return;
          }
          rejects.length = 0;
          if (lastRejectSortColumn == "hostname") {
            lastRejectSortAscending = !lastRejectSortAscending; // prevents sort from being reversed
          }
          LoadRejects();
          break;
      }
      kObserverService.notifyObservers(null, "passwordmgr-dialog-updated", null);
    }
  }
}

/*** =================== GENERAL CODE =================== ***/

function DeleteAllFromTree(tree, view, table, deletedTable, removeButton, removeAllButton) {

  // remove all items from table and place in deleted table
  for (var i=0; i<table.length; i++) {
    deletedTable[deletedTable.length] = table[i];
  }
  table.length = 0;

  // clear out selections
  view.selection.select(-1); 

  // update the tree view and notify the tree
  view.rowCount = 0;

  var box = tree.treeBoxObject;
  box.rowCountChanged(0, -deletedTable.length);
  box.invalidate();


  // disable buttons
  document.getElementById(removeButton).setAttribute("disabled", "true")
  document.getElementById(removeAllButton).setAttribute("disabled","true");
}

function DeleteSelectedItemFromTree
    (tree, view, table, deletedTable, removeButton, removeAllButton) {

  // Turn off tree selection notifications during the deletion
  tree.view.selection.selectEventsSuppressed = true;

  // remove selected items from list (by setting them to null) and place in deleted list
  var selections = GetTreeSelections(tree);
  for (var s=selections.length-1; s>= 0; s--) {
    var i = selections[s];
    deletedTable[deletedTable.length] = table[i];
    table[i] = null;
  }

  // collapse list by removing all the null entries
  for (var j=0; j<table.length; j++) {
    if (table[j] == null) {
      var k = j;
      while ((k < table.length) && (table[k] == null)) {
        k++;
      }
      table.splice(j, k-j);
      view.rowCount -= k - j;
      tree.treeBoxObject.rowCountChanged(j, j - k);
    }
  }

  // update selection and/or buttons
  if (table.length) {
    // update selection
    var nextSelection = (selections[0] < table.length) ? selections[0] : table.length-1;
    tree.view.selection.select(nextSelection);
    tree.treeBoxObject.ensureRowIsVisible(nextSelection);
  } else {
    // disable buttons
    document.getElementById(removeButton).setAttribute("disabled", "true")
    document.getElementById(removeAllButton).setAttribute("disabled","true");
  }
  tree.view.selection.selectEventsSuppressed = false;
}

function GetTreeSelections(tree) {
  var selections = [];
  var select = tree.view.selection;
  if (select) {
    var count = select.getRangeCount();
    var min = new Object();
    var max = new Object();
    for (var i=0; i<count; i++) {
      select.getRangeAt(i, min, max);
      for (var k=min.value; k<=max.value; k++) {
        if (k != -1) {
          selections[selections.length] = k;
        }
      }
    }
  }
  return selections;
}

function HandleTreeColumnClick(sortFunction, event) {
  if (event.target.nodeName != "treecol" || event.button != 0) {
    return;
  }

  let sortField = event.target.getAttribute("data-field-name");
  if (!sortField) {
    return;
  }

  sortFunction(sortField);
  Services.telemetry.getKeyedHistogramById("PWMGR_MANAGE_SORTED").add(sortField);
}

function SortTree(tree, view, table, column, lastSortColumn, lastSortAscending, updateSelection) {

  // remember which item was selected so we can restore it after the sort
  var selections = GetTreeSelections(tree);
  var selectedNumber = selections.length ? table[selections[0]].number : -1;

  // determine if sort is to be ascending or descending
  var ascending = (column == lastSortColumn) ? !lastSortAscending : true;

  function compareFunc(a, b) {
    var valA, valB;
    switch (column) {
      case "hostname":
        var realmA = a.httpRealm;
        var realmB = b.httpRealm;
        realmA = realmA == null ? "" : realmA.toLowerCase();
        realmB = realmB == null ? "" : realmB.toLowerCase();

        valA = a[column].toLowerCase() + realmA;
        valB = b[column].toLowerCase() + realmB;
        break;
      case "username":
      case "password":
        valA = a[column].toLowerCase();
        valB = b[column].toLowerCase();
        break;

      default:
        valA = a[column];
        valB = b[column];
    }

    if (valA < valB)
      return -1;
    if (valA > valB)
      return 1;
    return 0;
  }

  // do the sort
  table.sort(compareFunc);
  if (!ascending)
    table.reverse();

  // restore the selection
  var selectedRow = -1;
  if (selectedNumber>=0 && updateSelection) {
    for (var s=0; s<table.length; s++) {
      if (table[s].number == selectedNumber) {
        // update selection
        // note: we need to deselect before reselecting in order to trigger ...Selected()
        tree.view.selection.select(-1);
        tree.view.selection.select(s);
        selectedRow = s;
        break;
      }
    }
  }

  // display the results
  tree.treeBoxObject.invalidate();
  if (selectedRow >= 0) {
    tree.treeBoxObject.ensureRowIsVisible(selectedRow)
  }

  return ascending;
}

