Brazen Base Search Enhancer

Base class for search enhancement scripts

Dette scriptet burde ikke installeres direkte. Det er et bibliotek for andre script å inkludere med det nye metadirektivet // @require https://update.sleazyfork.org/scripts/416105/1478692/Brazen%20Base%20Search%20Enhancer.js

// ==UserScript==
// @name         Brazen Base Search Enhancer
// @namespace    brazenvoid
// @version      6.6.0
// @author       brazenvoid
// @license      GPL-3.0-only
// @description  Base class for search enhancement scripts
// ==/UserScript==

const ICON_RECYCLE = '&#x267B'

// Preset filter configuration keys

const CONFIG_PAGINATOR_LIMIT = 'Pagination Limit'
const CONFIG_PAGINATOR_THRESHOLD = 'Pagination Threshold'

const FILTER_DURATION_RANGE = 'Duration'
const FILTER_PERCENTAGE_RATING_RANGE = 'Rating'
const FILTER_SUBSCRIBED_VIDEOS = 'Hide Subscribed Videos'
const FILTER_TAG_BLACKLIST = 'Tag Blacklist'
const FILTER_TEXT_BLACKLIST = 'Blacklist'
const FILTER_TEXT_SEARCH = 'Search'
const FILTER_TEXT_SANITIZATION = 'Text Sanitization Rules'
const FILTER_TEXT_WHITELIST = 'Whitelist'
const FILTER_UNRATED = 'Unrated'

const STORE_SUBSCRIPTIONS = 'Account Subscriptions'

// Item preset attributes

const ITEM_NAME = 'name'
const ITEM_PROCESSED_ONCE = 'processedOnce'

// Configuration

const OPTION_ENABLE_TEXT_BLACKLIST = 'Enable Text Blacklist'
const OPTION_ENABLE_TAG_BLACKLIST = 'Enable Tag Blacklist'
const OPTION_ALWAYS_SHOW_SETTINGS_PANE = 'Always Show Settings Pane'
const OPTION_DISABLE_COMPLIANCE_VALIDATION = 'Disable All Filters'

class BrazenBaseSearchEnhancer
{
  /**
   * @typedef {{configKey: string, validate: SearchEnhancerFilterValidationCallback, comply: SearchEnhancerFilterComplianceCallback}} ComplianceFilter
   */

  /**
   * @typedef {{isUserLoggedIn: boolean, itemDeepAnalysisSelector: JQuery.Selector, itemListSelectors: JQuery.Selector, itemLinkSelector: JQuery.Selector,
   *            itemNameSelector: JQuery.Selector, itemSelectors: JQuery.Selector, itemSelectionMethod: string, requestDelay: number, scriptPrefix: string,
   *            tagSelectorGenerator?: SearchEnhancerTagSelectorGeneratorCallback|null}} Configuration
   */

  /**
   * @callback SearchEnhancerFilterValidationCallback
   * @param {*} configValues
   * @return boolean
   */

  /**
   * @callback SearchEnhancerFilterComplianceCallback
   * @param {JQuery} item
   * @param {*} configValues
   * @return {*}
   */

  /**
   * @callback SubscriptionsFilterExclusionsCallback
   * @return {boolean}
   */

  /**
   * @callback SubscriptionsFilterUsernameCallback
   * @param {JQuery} item
   * @return {boolean|string}
   */

  /**
   * @callback SearchEnhancerTagsExtractionCallback
   * @param {JQuery} item
   * @return {string[]}
   */

  /**
   * @callback SearchEnhancerTagSelectorGeneratorCallback
   * @param {string} tag
   * @return {string}
   */

  /**
   * @param {Configuration} configuration
   */
  constructor(configuration)
  {
    /**
     * Array of item compliance filters ordered in intended sequence of execution
     * @type {ComplianceFilter[]}
     * @private
     */
    this._complianceFilters = []

    /**
     * Pagination manager
     * @type BrazenPaginator|null
     * @protected
     */
    this._paginator = null

    /**
     * @type {Configuration}
     * @protected
     */
    this._config = configuration

    /**
     * @type {BrazenItemAttributesResolver}
     * @protected
     */
    this._itemAttributesResolver = new BrazenItemAttributesResolver({
      itemDeepAnalysisSelector: this._config.itemDeepAnalysisSelector,
      itemLinkSelector: this._config.itemLinkSelector,
      requestDelay: this._config.requestDelay,
      onDeepAttributesResolution: (item) => {
        this._complyItem(item)
        Utilities.processEventHandlerQueue(this._onAfterComplianceRun)
      },
    })

    /**
     * @type {SearchEnhancerTagSelectorGeneratorCallback|null}
     * @private
     */
    this._tagSelectorGenerator = configuration.tagSelectorGenerator

    /**
     * @type {boolean}
     * @private
     */
    this._sanitizationEnabled = false

    /**
     * @type {StatisticsRecorder}
     * @protected
     */
    this._statistics = new StatisticsRecorder(this._config.scriptPrefix)

    /**
     * @type {BrazenSubscriptionsLoader|null}
     * @protected
     */
    this._subscriptionsLoader = null

    /**
     * @type {JQuery<HTMLElement> | jQuery | HTMLElement}
     * @protected
     */
    this._syncConfigButton = $('<button id="brazen-sync-config-btn" style="position: fixed"></button>').
        text(ICON_RECYCLE).
        hide().
        appendTo($('body')).
        on('click', () => {
          this._onResetSettings()
          this._syncConfigButton.hide()
        })

    /**
     * @type {BrazenUIGenerator}
     * @protected
     */
    this._uiGen = new BrazenUIGenerator(this._config.scriptPrefix)

    /**
     * Local storage store with defaults
     * @type {BrazenConfigurationManager}
     * @protected
     */
    this._configurationManager = BrazenConfigurationManager.create(this._uiGen).
        onExternalConfigurationChange(() => this._validateCompliance()).
        addFlagField(OPTION_DISABLE_COMPLIANCE_VALIDATION, 'Disables all search filters.').
        addFlagField(OPTION_ALWAYS_SHOW_SETTINGS_PANE, 'Always show configuration interface.')

    // Events

    /**
     * Operations to perform after script initialization
     * @type {function[]}
     * @protected
     */
    this._onAfterInitialization = []

    /**
     * Operations to perform after a complete compliance run
     * @type {function[]}
     * @protected
     */
    this._onAfterComplianceRun = []

    /**
     * Operations to perform after UI generation
     * @type {function[]}
     * @protected
     */
    this._onAfterUIBuild = []

    /**
     * Operations to perform before compliance validation. This callback can also be used to skip compliance validation by returning false.
     * @type {function[]}
     * @protected
     */
    this._onBeforeCompliance = []

    /**
     * Operations to perform before UI generation
     * @type {function[]}
     * @protected
     */
    this._onBeforeUIBuild = []

    /**
     * Operations to perform after compliance checks, the first time item is retrieved
     * @type {function(JQuery)[]}
     * @protected
     */
    this._onFirstHitAfterCompliance = []

    /**
     * Operations to perform before compliance checks, the first time item is retrieved
     * @type {function(JQuery)[]}
     * @protected
     */
    this._onFirstHitBeforeCompliance = []

    /**
     * Logic to hide a non-compliant item
     * @type {Function}
     * @param {JQuery} item
     * @protected
     */
    this._onItemHide = (item) => {
      item.addClass('noncompliant-item')
      item.hide()
    }

    /**
     * Logic to show compliant item
     * @type {Function[]}
     * @param {JQuery} item
     * @protected
     */
    this._onItemShow = [(item) => {
      item.removeClass('noncompliant-item')
      item.show()
    }]

    /**
     * Validate initiating initialization.
     * Can be used to stop script init on specific pages or vice versa
     * @type {Function}
     * @protected
     */
    this._onValidateInit = () => true

    /**
     * Must return the generated settings section node
     * @type {JQuery[]}
     * @protected
     */
    this._userInterface = []
  }

  /**
   * @param {string} helpText
   * @protected
   */
  _addItemBlacklistFilter(helpText)
  {
    this._configurationManager.addFlagField(OPTION_ENABLE_TEXT_BLACKLIST, 'Applies the blacklist.').addRulesetField(
        FILTER_TEXT_BLACKLIST,
        5,
        helpText,
        null,
        null,
        (rules) => Utilities.buildWholeWordMatchingRegex(rules) ?? '',
    )
    this._addItemComplexComplianceFilter(
        FILTER_TEXT_BLACKLIST,
        (rules) => this._getConfig(OPTION_ENABLE_TEXT_BLACKLIST) && rules.length,
        (item, value) => this._get(item, ITEM_NAME)?.match(value) === null,
    )
  }

  /**
   * @param {string} configKey
   * @param {SearchEnhancerFilterValidationCallback|null} validationCallback
   * @param {SearchEnhancerFilterComplianceCallback|null|string} complianceCallback
   * @protected
   */
  _addItemComplexComplianceFilter(configKey, validationCallback, complianceCallback)
  {
    this._addItemComplianceFilter(configKey, complianceCallback, validationCallback)
  }

  /**
   * @param {string} configKey
   * @param {SearchEnhancerFilterComplianceCallback|null|string} action
   * @param {SearchEnhancerFilterValidationCallback|null} validationCallback
   * @protected
   */
  _addItemComplianceFilter(configKey, action = null, validationCallback = null)
  {
    let configType = this._configurationManager.getField(configKey).type
    if (action === null) {
      action = configKey
    }
    if (typeof action === 'string') {
      let attributeName = action
      switch (configType) {
        case CONFIG_TYPE_CHECKBOXES_GROUP:
          action = (item, values) => {
            let attribute = this._get(item, attributeName)
            return attribute && values.length ? values.includes(attribute) : true
          }
          break
        case CONFIG_TYPE_FLAG:
          action = (item) => {
            let attribute = this._get(item, attributeName)
            return attribute !== null ? attribute : true
          }
          break
        case CONFIG_TYPE_RADIOS_GROUP:
          action = (item, value) => {
            let attribute = this._get(item, attributeName)
            return attribute ? value === attribute : true
          }
          break
        case CONFIG_TYPE_RANGE:
          action = (item, range) => {
            let attribute = this._get(item, attributeName)
            return attribute ? Validator.isInRange(this._get(item, attributeName), range.minimum, range.maximum) : true
          }
          break
        default:
          throw new Error('Associated config type requires explicit action callback definition.')
      }
    }
    if (validationCallback === null) {
      validationCallback = this._configurationManager.generateValidationCallback(configKey)
    }
    this._complianceFilters.push({
      configKey: configKey,
      validate: validationCallback,
      comply: action,
    })
  }

  /**
   * @param {JQuery.Selector|Function} durationNodeSelector
   * @param {string|null} helpText
   * @protected
   */
  _addItemDurationRangeFilter(durationNodeSelector, helpText = null)
  {
    this._configurationManager.addRangeField(FILTER_DURATION_RANGE, 0, 100000, helpText ?? 'Filter items by duration.')

    this._itemAttributesResolver.addAttribute(FILTER_DURATION_RANGE, (item) => {
      let duration
      if (typeof durationNodeSelector !== 'function') {
        let durationNode = item.find(durationNodeSelector)
        if (durationNode.length) {
          duration = durationNode.text().trim()
        } else {
          return null
        }
      } else {
        duration = durationNodeSelector(item)
      }
      duration = duration.split(':')
      duration = (parseInt(duration[0]) * 60) + parseInt(duration[1])
      return duration === 0 ? null : duration
    })

    this._addItemComplianceFilter(FILTER_DURATION_RANGE)
  }

  /**
   * @param {JQuery.Selector} ratingNodeSelector
   * @param {string|null} helpText
   * @param {string|null} unratedHelpText
   * @protected
   */
  _addItemPercentageRatingRangeFilter(ratingNodeSelector, helpText = null, unratedHelpText = null)
  {
    this._configurationManager.addRangeField(FILTER_PERCENTAGE_RATING_RANGE, 0, 100000,
        helpText ?? 'Filter items by percentage rating.').addFlagField(
        FILTER_UNRATED, unratedHelpText ?? 'Hide items with zero or no rating.')

    this._itemAttributesResolver.addAttribute(FILTER_PERCENTAGE_RATING_RANGE, (item) => {
      let rating = item.find(ratingNodeSelector)
      return rating.length === 0 ? null : parseInt(rating.text().replace('%', ''))
    })

    this._addItemComplianceFilter(FILTER_PERCENTAGE_RATING_RANGE, (item, range) => {
      let rating = this._get(item, FILTER_PERCENTAGE_RATING_RANGE)
      return rating ? Validator.isInRange(rating, range.minimum, range.maximum) : !this._getConfig(FILTER_UNRATED)
    })
  }

  /**
   * @param {string} key
   * @param {boolean} deepAttribute
   * @param {boolean} saveSelectors
   * @param {SearchEnhancerTagsExtractionCallback} callback
   * @protected
   */
  _addItemTagAttribute(key, deepAttribute, saveSelectors, callback)
  {
    let tagsToSelectorsMapper = (item) => {
      if (saveSelectors) {
        let tagSelectors = ''
        for (let tag of callback(item)) {
          tagSelectors += this._tagSelectorGenerator(tag)
        }
        return tagSelectors
      }
      let tags = []
      for (let tag of callback(item)) {
        tags.push(tag)
      }
      return tags
    }
    if (deepAttribute) {
      this._itemAttributesResolver.addDeepAttribute(key, tagsToSelectorsMapper)
    } else {
      this._itemAttributesResolver.addAttribute(key, tagsToSelectorsMapper)
    }
  }

  /**
   * @param {string|null} attribute
   * @param {boolean} useSelectors
   * @param {int} rows
   * @param {string|null} helpText
   * @protected
   */
  _addItemTagBlacklistFilter(attribute, useSelectors, rows = 5, helpText = null)
  {
    if (helpText === null) {
      helpText = 'Specify the tags blacklist with one rule on each line. "&" "|" can be used.'
    }

    this._configurationManager.addFlagField(OPTION_ENABLE_TAG_BLACKLIST, 'Applies the blacklist.')
    this._addTagRulesetField(FILTER_TAG_BLACKLIST, useSelectors, rows, helpText)

    this._addItemComplexComplianceFilter(
        FILTER_TAG_BLACKLIST,
        (rules) => this._getConfig(OPTION_ENABLE_TAG_BLACKLIST) && rules.length,
        (item, blacklistRuleset) => {
          let isBlacklisted
          let itemTags = this._get(item, attribute)

          if (itemTags !== null && itemTags.length) {
            for (let rule of blacklistRuleset) {

              isBlacklisted = true
              for (let tag of rule) {

                if (!itemTags.includes(tag)) {
                  isBlacklisted = false
                  break
                }
              }
              if (isBlacklisted) {
                return false
              }
            }
          }
          return true
        },
    )
  }

  /**
   * @param {string} configKey
   * @param {JQuery|null} otherTagSectionsSelector
   * @param {string} styleClass
   * @param {int} rows
   * @param {string} helpText
   * @param {string} otherHighlightClasses
   * @protected
   */
  _addItemTagHighlights(
      configKey,
      otherTagSectionsSelector,
      styleClass,
      helpText,
      rows = 5,
      otherHighlightClasses = '',
  )
  {
    this._addTagRulesetField(configKey, true, rows, helpText)

    let highlightsHandler = (section) => {

      let ruleApplies
      for (let rule of this._configurationManager.getField(configKey).optimized) {

        ruleApplies = true
        for (let tagSelector of rule) {

          if (section.find(tagSelector).length === 0) {
            ruleApplies = false
            break
          }
        }
        if (ruleApplies) {
          section.find(rule.join(', ')).
              removeClass(otherHighlightClasses + ' ' + styleClass).
              addClass(styleClass)
        }
      }
    }
    if (otherTagSectionsSelector !== null && otherTagSectionsSelector.length > 0) {
      this._onBeforeUIBuild.push(() => highlightsHandler(otherTagSectionsSelector))
    }
    this._onItemShow.push((item) => highlightsHandler(item))
  }

  /**
   * @param {string} helpText
   * @protected
   */
  _addItemTextSanitizationFilter(helpText)
  {
    this._sanitizationEnabled = true

    this._configurationManager.addRulesetField(FILTER_TEXT_SANITIZATION, 2, helpText, (rules) => {
      let sanitizationRules = {}, fragments, validatedTargetWords
      for (let sanitizationRule of rules) {

        if (sanitizationRule.includes('=')) {
          fragments = sanitizationRule.split('=')
          if (fragments[0] === '') {
            fragments[0] = ' '
          }

          validatedTargetWords = Utilities.trimAndKeepNonEmptyStrings(fragments[1].split(','))
          if (validatedTargetWords.length) {
            sanitizationRules[fragments[0]] = validatedTargetWords
          }
        }
      }
      return sanitizationRules
    }, (rules) => {
      let sanitizationRulesText = []
      for (let substitute in rules) {
        sanitizationRulesText.push(substitute + '=' + rules[substitute].join(','))
      }
      return sanitizationRulesText

    }, (rules) => {
      let optimizedRules = {}
      for (const substitute in rules) {
        optimizedRules[substitute] = Utilities.buildWholeWordMatchingRegex(rules[substitute])
      }
      return optimizedRules
    })
  }

  /**
   * @param {string|null} helpText
   * @protected
   */
  _addItemTextSearchFilter(helpText = null)
  {
    this._configurationManager.addTextField(FILTER_TEXT_SEARCH,
        helpText ?? 'Show videos with these comma separated words in their names.')
    this._addItemComplianceFilter(FILTER_TEXT_SEARCH, (item, value) => this._get(item, ITEM_NAME).includes(value))
  }

  /**
   * @param {string} helpText
   * @protected
   */
  _addItemWhitelistFilter(helpText)
  {
    this._configurationManager.addRulesetField(
        FILTER_TEXT_WHITELIST, 5, helpText, null, null, (rules) => Utilities.buildWholeWordMatchingRegex(rules))
  }

  /**
   * @param {SubscriptionsFilterExclusionsCallback} exclusionsCallback Add page exclusions here
   * @param {SubscriptionsFilterUsernameCallback} getItemUsername Return username of the item or return false to skip
   * @protected
   */
  _addSubscriptionsFilter(exclusionsCallback, getItemUsername)
  {
    this._configurationManager.addFlagField(FILTER_SUBSCRIBED_VIDEOS, 'Hide videos from subscribed channels.').
        addTextField(STORE_SUBSCRIPTIONS, 'Recorded subscription accounts.')

    this._addItemComplexComplianceFilter(
        FILTER_SUBSCRIBED_VIDEOS,
        (value) => value && this._config.isUserLoggedIn && exclusionsCallback(),
        (item) => {
          let username = getItemUsername(item)
          if (username === false) {
            return true
          }
          return !(new RegExp('"([^"]*' + username + '[^"]*)"')).test(this._getConfig(STORE_SUBSCRIPTIONS))
        })
  }

  /**
   * @param {string} key
   * @param {boolean} useSelectors
   * @param {number} rows
   * @param {string|null} helpText
   * @return {BrazenConfigurationManager}
   */
  _addTagRulesetField(key, useSelectors, rows, helpText = null)
  {
    return this._configurationManager.addRulesetField(key, rows, helpText, null, null, (rules) => {

      let orTags, iteratedRuleset
      let optimizedRuleset = []

      // Operations

      let expandRuleset = (ruleset, tags) => {

        let grownRuleset = []
        for (let tag of tags) {
          tag = tag.trim()
          for (let rule of ruleset) {
            grownRuleset.push([...rule, useSelectors ? this._tagSelectorGenerator(tag) : tag])
          }
        }
        return grownRuleset
      }

      let growRuleset = (ruleset, tagToAdd) => {

        if (ruleset.length) {

          tagToAdd = tagToAdd.trim()

          for (let rule of ruleset) {
            rule.push(useSelectors ? this._tagSelectorGenerator(tagToAdd) : tagToAdd)
          }

        } else {

          let tags = typeof tagToAdd === 'string' ? [tagToAdd] : tagToAdd

          for (let tag of tags) {
            tag = tag.trim()
            ruleset.push([useSelectors ? this._tagSelectorGenerator(tag) : tag])
          }
        }
      }

      // Translate user defined rules

      for (let blacklistedRule of rules) {

        iteratedRuleset = []
        for (let andTag of blacklistedRule.split('&')) {

          orTags = andTag.split('|')
          if (orTags.length === 1) {
            growRuleset(iteratedRuleset, andTag)
          } else if (iteratedRuleset.length) {
            iteratedRuleset = expandRuleset(iteratedRuleset, orTags)
          } else {
            growRuleset(iteratedRuleset, orTags)
          }
        }
        optimizedRuleset = optimizedRuleset.concat(iteratedRuleset)
      }

      // Sort rules by complexity

      return optimizedRuleset.sort((a, b) => a.length - b.length)
    })
  }

  /**
   * @param {JQuery} item
   * @protected
   */
  _complyItem(item)
  {
    let itemComplies = true

    if (!this._getConfig(OPTION_DISABLE_COMPLIANCE_VALIDATION) &&
        this._validateItemWhiteList(item) &&
        Utilities.processEventHandlerQueue(this._onBeforeCompliance, [item], true)
    ) {
      let configField

      for (let complianceFilter of this._complianceFilters) {

        configField = this._configurationManager.getFieldOrFail(complianceFilter.configKey)
        if (complianceFilter.validate(configField.optimized ?? configField.value)) {
          itemComplies = complianceFilter.comply(item, configField.optimized ?? configField.value)
          this._statistics.record(complianceFilter.configKey, itemComplies)
          if (!itemComplies) {
            break
          }
        }
      }
    }
    if (itemComplies) {
      for (let itemShowHandler of this._onItemShow) {
        Utilities.callEventHandler(itemShowHandler, [item])
      }
    } else {
      Utilities.callEventHandler(this._onItemHide, [item])
    }
    item.css('opacity', 'unset')
  }

  /**
   * Filters items as per settings
   * @param {JQuery} itemsList
   * @param {boolean} fromObserver
   * @protected
   */
  _complyItemsList(itemsList, fromObserver = false)
  {
    let items
    if (fromObserver) {
      items = itemsList.filter(this._config.itemSelectors).add(itemsList.find(this._config.itemSelectors))
    } else if (this._config.itemSelectionMethod === 'find') {
      items = itemsList.find(this._config.itemSelectors)
    } else {
      items = itemsList.children(this._config.itemSelectors)
    }
    items.css('opacity', 0.75).each((index, element) => {

      let item = $(element)

      // First run processing

      if (this._get(item, ITEM_PROCESSED_ONCE) === null) {
        if (this._sanitizationEnabled) {
          Validator.sanitizeTextNode(
              item.find(this._config.itemNameSelector),
              this._configurationManager.getFieldOrFail(FILTER_TEXT_SANITIZATION).optimized)
        }
        this._itemAttributesResolver.resolveAttributes(item)
        Utilities.processEventHandlerQueue(this._onFirstHitBeforeCompliance, [item])
      }

      // Compliance filtering

      this._complyItem(item)

      // After first run processing

      if (!this._get(item, ITEM_PROCESSED_ONCE)) {
        Utilities.processEventHandlerQueue(this._onFirstHitAfterCompliance, [item])
        this._itemAttributesResolver.set(item, ITEM_PROCESSED_ONCE, true)
      }
    })
    this._statistics.updateUI()
  }

  /**
   * @protected
   * @return {JQuery[]}
   */
  _createPaginationControls()
  {
    return [
      this._configurationManager.createElement(CONFIG_PAGINATOR_THRESHOLD),
      this._configurationManager.createElement(CONFIG_PAGINATOR_LIMIT)]
  }

  /**
   * @protected
   * @return {JQuery}
   */
  _createSettingsBackupRestoreFormActions()
  {
    return this._uiGen.createFormActions([
      this._uiGen.createFormButton(
          'Backup Configuration', 'Backup configuration to the clipboard.', () => this._onBackupSettings()),
      this._uiGen.createSeparator(),
      this._uiGen.createFormGroupInput('text').attr('id', 'restore-settings').attr('placeholder', 'Paste settings...'),
      this._uiGen.createFormButton(
          'Restore Configuration', 'Restore configuration from the above field.', () => this._onRestoreSettings()),
    ], 'bv-flex-column')
  }

  /**
   * @protected
   * @return {JQuery}
   */
  _createSettingsFormActions()
  {
    return this._uiGen.createFormActions([
      this._uiGen.createFormButton('Apply', 'Apply settings.', () => this._onApplyNewSettings()),
      this._uiGen.createFormButton('Save', 'Apply and update saved configuration.', () => this._onSaveSettings()),
      this._uiGen.createFormButton('Reset', 'Revert to saved configuration.', () => this._onResetSettings()),
    ])
  }

  /**
   * @protected
   * @return {JQuery}
   */
  _createSubscriptionLoaderControls()
  {
    let button = this._uiGen.createFormButton('Load Subscriptions',
        'Makes a copy of your subscriptions in cache for related filters.', (event) => {
          if (this._config.isUserLoggedIn) {
            $(event.currentTarget).prop('disabled', true)

            this._subscriptionsLoader.run()
          } else {
            this._showNotLoggedInAlert()
          }
        })
    return button.attr('id', 'subscriptions-loader')
  }

  /**
   * @param {JQuery} UISection
   * @private
   */
  _embedUI(UISection)
  {
    UISection.on('mouseleave', (event) => {
      if (!this._getConfig(OPTION_ALWAYS_SHOW_SETTINGS_PANE)) {
        $(event.currentTarget).slideUp(300)
      }
    })
    if (this._getConfig(OPTION_ALWAYS_SHOW_SETTINGS_PANE)) {
      UISection.show()
    }
    this._uiGen.constructor.appendToBody(UISection)
    this._uiGen.constructor.appendToBody(this._uiGen.createSettingsShowButton('', UISection))
  }

  /**
   * @param {JQuery} item
   * @param {string} attributeName
   * @returns {*}
   * @protected
   */
  _get(item, attributeName)
  {
    return this._itemAttributesResolver.get(item, attributeName)
  }

  /**
   * @param {string} config
   * @returns {*}
   * @protected
   */
  _getConfig(config)
  {
    return this._configurationManager.getValue(config)
  }

  /**
   * @private
   */
  _onApplyNewSettings()
  {
    this._configurationManager.update()
    this._validateCompliance()
  }

  /**
   * @private
   */
  _onBackupSettings()
  {
    navigator.clipboard.writeText(this._configurationManager.backup()).
        then(() => this._uiGen.updateStatus('Settings backed up to clipboard!')).
        catch(
            () => this._uiGen.updateStatus('Settings backup failed!'))
  }

  /**
   * @private
   */
  _onResetSettings()
  {
    this._configurationManager.revertChanges()
    this._validateCompliance()
  }

  /**
   * @private
   */
  _onRestoreSettings()
  {
    let settings = $('#restore-settings').val().trim()
    if (!settings) {
      this._uiGen.updateStatus('No Settings provided!', true)
      Utilities.sleep(3000).then(() => this._uiGen.resetStatus())
    } else {
      try {
        this._configurationManager.restore(settings)
        this._uiGen.updateStatus('Settings restored!')
        this._validateCompliance()
      } catch (e) {
        this._uiGen.updateStatus('Settings restoration failed!')
      }
    }

  }

  /**
   * @private
   */
  _onSaveSettings()
  {
    this._onApplyNewSettings()
    this._configurationManager.save()
  }

  /**
   * @param {string} configKey
   * @param {function(*)} actionCallback
   * @param {function(*, function?): boolean} validationCallback
   * @returns {BrazenBaseSearchEnhancer}
   * @protected
   */
  _performComplexOperation(configKey, validationCallback, actionCallback)
  {
    return this._performOperation(configKey, actionCallback, validationCallback)
  }

  /**
   * @param {string} configKey
   * @param {function(*)} actionCallback
   * @param {function(*, function?): boolean|null} validationCallback
   * @returns {BrazenBaseSearchEnhancer}
   * @protected
   */
  _performOperation(configKey, actionCallback, validationCallback = null)
  {
    let configField = this._configurationManager.getField(configKey)
    let defaultValidationCallback = this._configurationManager.generateValidationCallback(configKey)
    let validationCallbackParams
    let values = configField.optimized ?? configField.value

    if (validationCallback) {
      validationCallbackParams = [values, defaultValidationCallback]
    } else {
      validationCallbackParams = [values]
      validationCallback = defaultValidationCallback
    }
    if (Utilities.callEventHandler(validationCallback, validationCallbackParams, true)) {
      actionCallback(values)
    }
    return this
  }

  /**
   * @param {string} flagConfigKey
   * @param {string} configKey
   * @param {function(*)} actionCallback
   * @param {function(*, function?): boolean} validationCallback
   * @returns {BrazenBaseSearchEnhancer}
   * @protected
   */
  _performTogglableComplexOperation(flagConfigKey, configKey, validationCallback, actionCallback)
  {
    if (this._configurationManager.getValue(flagConfigKey)) {
      this._performComplexOperation(configKey, validationCallback, actionCallback)
    }
    return this
  }

  /**
   * @param {string} flagConfigKey
   * @param {string} configKey
   * @param {function(*)} actionCallback
   * @param {function(*, function?): boolean|null} validationCallback
   * @returns {BrazenBaseSearchEnhancer}
   * @protected
   */
  _performTogglableOperation(flagConfigKey, configKey, actionCallback, validationCallback = null)
  {
    if (this._configurationManager.getValue(flagConfigKey)) {
      this._performOperation(configKey, actionCallback, validationCallback)
    }
    return this
  }

  /**
   * @param {boolean} enableCondition
   * @param {PaginatorConfiguration} configuration
   * @protected
   */
  _setupPaginator(enableCondition, configuration)
  {
    if (enableCondition) {
      configuration.itemSelectors = this._config.itemSelectors
      this._paginator = new BrazenPaginator(configuration)
    }
    this._configurationManager.addNumberField(CONFIG_PAGINATOR_LIMIT, 1, 50,
        'Limit paginator to concatenate the specified number of maximum pages.').
        addNumberField(CONFIG_PAGINATOR_THRESHOLD, 1, 1000,
            'Make paginator ensure the specified number of minimum results.')
  }

  /**
   * @return {BrazenSubscriptionsLoader}
   * @protected
   */
  _setupSubscriptionLoader()
  {
    this._subscriptionsLoader =
        new BrazenSubscriptionsLoader((status) => this._uiGen.updateStatus(status), (subscriptions) => {
          this._configurationManager.getField(STORE_SUBSCRIPTIONS).value = subscriptions.length ? '"' +
              subscriptions.join('""') + '"' : ''
          this._configurationManager.save()
          $('#subscriptions-loader').prop('disabled', false)
        })
    return this._subscriptionsLoader
  }

  /**
   * @protected
   */
  _showNotLoggedInAlert()
  {
    alert('You need to be logged in to use this functionality')
  }

  /**
   * @param {boolean} firstRun
   * @protected
   */
  _validateCompliance(firstRun = false)
  {
    let itemLists = $(this._config.itemListSelectors)
    if (!firstRun) {
      this._statistics.reset()
      itemLists.each((index, itemsList) => {
        this._complyItemsList($(itemsList))
      })
    } else {
      itemLists.each((index, itemList) => {
        let itemListObject = $(itemList)

        if (this._paginator && itemListObject.is(this._paginator.getItemListSelector())) {

          ChildObserver.create().onNodesAdded((itemsAdded) => {
            this._complyItemsList($(itemsAdded), true)
            this._paginator.run(this._getConfig(CONFIG_PAGINATOR_THRESHOLD), this._getConfig(CONFIG_PAGINATOR_LIMIT))
          }).observe(itemList)

        } else {
          ChildObserver.create().onNodesAdded((itemsAdded) => {
            this._complyItemsList($(itemsAdded), true)
          }).observe(itemList)
        }

        this._complyItemsList(itemListObject)
      })
    }
    if (this._paginator) {
      this._paginator.run(this._getConfig(CONFIG_PAGINATOR_THRESHOLD), this._getConfig(CONFIG_PAGINATOR_LIMIT))
    }
    Utilities.processEventHandlerQueue(this._onAfterComplianceRun)
    this._itemAttributesResolver.completeResolutionRun()
  }

  /**
   * @param {JQuery} item
   * @return {boolean}
   * @protected
   */
  _validateItemWhiteList(item)
  {
    let field = this._configurationManager.getField(FILTER_TEXT_WHITELIST)
    if (field) {
      let validationResult = field.value.length
          ? Validator.regexMatches(this._get(item, ITEM_NAME), field.optimized)
          : true
      this._statistics.record(FILTER_TEXT_WHITELIST, validationResult)
      return validationResult
    }
    return true
  }

  /**
   * Initialize the script and do basic UI removals
   */
  init()
  {
    if (Utilities.callEventHandler(this._onValidateInit)) {

      this._configurationManager.initialize(this._config.scriptPrefix)

      this._itemAttributesResolver.
          addAttribute(ITEM_NAME, (item) => item.find(this._config.itemNameSelector).text()).
          addAttribute(ITEM_PROCESSED_ONCE, () => false)

      if (this._paginator) {
        this._paginator.initialize()
      }

      Utilities.processEventHandlerQueue(this._onBeforeUIBuild)
      this._embedUI(this._uiGen.createSettingsSection().append(this._userInterface))
      Utilities.processEventHandlerQueue(this._onAfterUIBuild)

      this._configurationManager.updateInterface()

      this._validateCompliance(true)

      this._uiGen.updateStatus('Initial run completed.')

      Utilities.processEventHandlerQueue(this._onAfterInitialization)
    }
  }

  /**
   * @returns {boolean}
   */
  isUserLoggedIn()
  {
    return this._config.isUserLoggedIn
  }
}