chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
  if (request.command != "filters_updated")
    return;
  if ($("#txtFiltersAdvanced").prop("disabled") === false)
    return;
  BGcall("get_custom_filters_text", function(text) {
    $("#txtFiltersAdvanced").val(text);
  });
  BGcall("get_exclude_filters_text", function(text) {
    $("#txtExcludeFiltersAdvanced").val(text);
  });
  // BUG: CWE-284 Improper Access Control
  // sendResponse({});
  // FIXED:
  // a call to sendResponse is not needed because of the call in filters.js
});

$(function() {
    //try to get filter syntax page with users language
    //if it fails, default to english (en).
    var syntaxURL = "https://adblockplus.org/" +
                    determineUserLanguage() +
                    "/filters";

    var jqxhr = $.ajax({
      type: 'get',
      url: syntaxURL,
      success: function(e) {
        //since the ABP site uses a custom server side 404 handler, instead of returing us a 404 http status code
        //we need to parse the response text looking for a 404 message for the user.
        if (jqxhr.responseText &&
            jqxhr.responseText.indexOf("404 - The requested URL was not found.") > 0) {
            $('#tutorlink').attr("href", "https://adblockplus.org/en/filters");
        } else {
            $('#tutorlink').attr("href", syntaxURL);
        }
      },
      error: function(e) {
        $('#tutorlink').attr("href", "https://adblockplus.org/en/filters");
      },
    });


  // Add a custom filter to the list
  function appendCustomFilter(filter) {
    var customFilterText = $("#txtFiltersAdvanced").val();
    $("#txtFiltersAdvanced").val(filter + "\n" + customFilterText);
    saveFilters();
    $(".addControls").slideUp();
  }

  // Convert a messy list of domains to ~domain1.com|~domain2.com format
  function toTildePipeFormat(domainList) {
    domainList = domainList.trim().replace(/[\ \,\;\|]+\~?/g, "|~");
    if (domainList && domainList[0] != "~")
      domainList = "~" + domainList;
    return domainList;
  }

  $("#txtBlacklist").focus(function() {
    // Find the blacklist entry in the user's filters, and put it
    // into the blacklist input.
    var customFilterText = $("#txtFiltersAdvanced").val();
    var match = customFilterText.match(/^\@\@\*\$document\,domain\=(\~.*)$/m);
    if (match && $(this).val() == "")
      $(this).val(match[1]);
  });

  // The add_filter functions
  $("#btnAddUserFilter").click(function() {
    var blockCss = $("#txtUserFilterCss").val().trim();
    var blockDomain = $("#txtUserFilterDomain").val().trim();

    if (blockDomain == '.*' || blockDomain == "*" || blockDomain == '')
      appendCustomFilter("##" + blockCss);
    else
      appendCustomFilter(blockDomain + "##" + blockCss);

    $(this).closest(".entryTable").find("input[type='text']").val("");
    $(this).prop("disabled", true);
  });

  $("#btnAddExcludeFilter").click(function() {
    var excludeUrl = $("#txtUnblock").val().trim();

    //prevent regexes
    if (/^\/.*\/$/.test(excludeUrl))
      excludeUrl = excludeUrl + "*";

    appendCustomFilter('@@' + excludeUrl + '$document');

    $(this).closest(".entryTable").find("input[type='text']").val("");
    $(this).prop("disabled", true);
  });

  $("#btnAddBlacklist").click(function() {
    var blacklist = toTildePipeFormat($("#txtBlacklist").val());

    var filters = $("#txtFiltersAdvanced").val().trim() + '\n';
    // Delete the first likely line
    filters = filters.replace(/^\@\@\*\$document,domain\=~.*\n/m, "").trim();
    $("#txtFiltersAdvanced").val(filters);
    // Add our line in its place, or if it was empty, remove the filter
    if (blacklist)
      appendCustomFilter("@@*$document,domain=" + blacklist);
    else
      saveFilters(); // just record the deletion
    $("#btnAddBlacklist").prop("disabled", true);
  });

  $("#btnAddUrlBlock").click(function() {
    var blockUrl = $("#txtBlockUrl").val().trim();
    var blockDomain = $("#txtBlockUrlDomain").val().trim();
    if (blockDomain == '*')
      blockDomain = '';

    //prevent regexes
    if (/^\/.*\/$/.test(blockUrl))
      blockUrl = blockUrl + "*";

    if (blockDomain == '')
      appendCustomFilter(blockUrl);
    else
      appendCustomFilter(blockUrl + "$domain=" + blockDomain);

    $(this).closest(".entryTable").find("input[type='text']").val("");
    $(this).prop("disabled", true);
  });

  // The validation functions
  $("#txtBlacklist").bind("input", function() {
    var blacklist = toTildePipeFormat($("#txtBlacklist").val());

    if (blacklist)
      blacklist = "@@*$document,domain=" + blacklist;

    try {
      FilterNormalizer.normalizeLine(blacklist);
      $("#btnAddBlacklist").prop("disabled", false);
    } catch(ex) {
      $("#btnAddBlacklist").prop("disabled", true);
    }
  });

  $("#divUrlBlock input[type='text']").bind("input", function() {
    var blockUrl = $("#txtBlockUrl").val().trim();
    var blockDomain = $("#txtBlockUrlDomain").val().trim();
    if (blockDomain == '*')
      blockDomain = '';
    if (blockDomain)
      blockDomain = '$domain=' + blockDomain;
    var ok = false;
    try {
      if (FilterNormalizer.normalizeLine(blockUrl + blockDomain))
        ok = true;
      if (Filter.isSelectorFilter(blockUrl))
        ok = false;
    } catch(ex) {}
    $("#btnAddUrlBlock").prop("disabled", ok ? null : true);
  });

  $("#divCssBlock input[type='text']").bind("input", function() {
    var blockCss = $("#txtUserFilterCss").val().trim();
    var blockDomain = $("#txtUserFilterDomain").val().trim();
    if (blockDomain == '*')
      blockDomain = '';
    var ok = false;
    try {
      if (FilterNormalizer.normalizeLine(blockDomain + "##" + blockCss))
        ok = true;
    } catch(ex) {}
    $("#btnAddUserFilter").prop("disabled", ok ? null : true);
  });

  $("#divExcludeBlock input[type='text']").bind("input", function() {
    var unblockUrl = $("#txtUnblock").val().trim();
    var ok = false;
    try {
      if (FilterNormalizer.normalizeLine('@@' + unblockUrl + '$document'))
        ok = true;
      if (!unblockUrl || Filter.isSelectorFilter(unblockUrl))
        ok = false;
    } catch(ex) {}
    $("#btnAddExcludeFilter").prop("disabled", ok ? null : true);
  });

  // When one presses 'Enter', pretend it was a click on the 'add' button
  $(".entryTable input[type='text']").keypress(function(event) {
    var submitButton = $(this).closest(".entryTable").find("input[type='button']");
    if (event.keyCode === 13 && !submitButton.prop("disabled")) {
      event.preventDefault();
      submitButton.click();
    }
  });

  $("a.controlsLink").click(function() {
    event.preventDefault();
    var myControls = $(this).closest("div").find(".addControls");
    $(".addControls").not(myControls).slideUp();
    myControls.slideToggle();
  });

  $("#btnEditAdvancedFilters").click(function() {
    $("#divAddNewFilter").slideUp();
    $(".addControls").slideUp();
    $("#txtFiltersAdvanced").prop("disabled", false);
    $("#spanSaveButton").show();
    $("#btnEditAdvancedFilters").hide();
    $("#txtFiltersAdvanced").focus();
  });

  $("#btnEditExcludeAdvancedFilters").click(function() {
    $("#divAddNewFilter").slideUp();
    $(".addControls").slideUp();
    $("#txtExcludeFiltersAdvanced").removeAttr("disabled");
    $("#spanSaveExcludeButton").show();
    $("#btnEditExcludeAdvancedFilters").hide();
    $("#txtExcludeFiltersAdvanced").focus();
  });

  // Update custom filter count in the background.
  // Inputs: custom_filters_text:string - string representation of the custom filters
  // delimited by new line.
  function updateCustomFiltersCount(custom_filters_text) {
    var custom_filters_array = custom_filters_text.split("\n");
    var new_count = {};
    var temp_filter_tracker = [];
    for(var i = 0; i < custom_filters_array.length; i++) {
      var filter = custom_filters_array[i]
      //Check if filter is a duplicate and that it is a hiding filter.
      if(temp_filter_tracker.indexOf(filter) < 0 && filter.indexOf("##") > -1) {
        temp_filter_tracker.push(filter);
        var host = filter.split("##")[0];
        new_count[host] = (new_count[host] || 0) + 1;
      }
    }
    BGcall("updateCustomFilterCountMap", new_count);
  }

  function saveFilters() {
    var custom_filters_text = $("#txtFiltersAdvanced").val();
    BGcall("set_custom_filters_text", custom_filters_text);

    updateCustomFiltersCount(custom_filters_text);

    $("#divAddNewFilter").slideDown();
    $("#txtFiltersAdvanced").prop("disabled", true);
    $("#spanSaveButton").hide();
    $("#btnEditAdvancedFilters").show();
    $("#btnCleanUp").show();
  }

  $("#btnSaveAdvancedFilters").click(saveFilters);

  function saveExcludeFilters() {
    var exclude_filters_text = $("#txtExcludeFiltersAdvanced").val();
    BGcall("set_exclude_filters", exclude_filters_text, function(ex) {
      $("#divAddNewFilter").slideDown();
      $("#txtExcludeFiltersAdvanced").attr("disabled", "disabled");
      $("#spanSaveExcludeButton").hide();
      $("#btnEditExcludeAdvancedFilters").show();
      BGcall("get_exclude_filters_text", function(text) {
        $("#txtExcludeFiltersAdvanced").val(text);
        if (text)
            $("#divExcludeFilters").show();
        });
    });

  }
  $("#btnSaveExcludeAdvancedFilters").click(saveExcludeFilters);

  BGcall("get_custom_filters_text", function(text) {
    $("#txtFiltersAdvanced").val(text);
  });

  BGcall("get_settings", function(settings) {
    if (settings.show_advanced_options)
        $("#divExcludeFilters").show();
  });

  BGcall("get_exclude_filters_text", function(text) {
    $("#txtExcludeFiltersAdvanced").val(text);
    if (text)
        $("#divExcludeFilters").show();
  });

  $("#btnCleanUp").click(function() {
    //Don't save immediately, first allow them to review changes
    if ($("#btnEditAdvancedFilters").is(":visible"))
      $("#btnEditAdvancedFilters").click();
    var newFilters = FilterNormalizer.normalizeList($("#txtFiltersAdvanced").val(), true);
    newFilters = newFilters.replace(/(\n)+$/,'\n'); // Del trailing \n's
    $("#txtFiltersAdvanced").val(newFilters);
  });
});