require 'csv'
require_dependency 'system_message'

module Jobs

  class ExportCsvFile < Jobs::Base
    include ActionView::Helpers::NumberHelper

    HEADER_ATTRS_FOR = {}
    HEADER_ATTRS_FOR['user_archive'] = ['topic_title','category','sub_category','is_pm','post','like_count','reply_count','url','created_at']
    HEADER_ATTRS_FOR['user_list'] = ['id','name','username','email','title','created_at','last_seen_at','last_posted_at','last_emailed_at','trust_level','approved','suspended_at','suspended_till','blocked','active','admin','moderator','ip_address']
    HEADER_ATTRS_FOR['user_stats'] = ['topics_entered','posts_read_count','time_read','topic_count','post_count','likes_given','likes_received']
    HEADER_ATTRS_FOR['user_sso'] = ['external_id','external_email', 'external_username', 'external_name', 'external_avatar_url']
    HEADER_ATTRS_FOR['staff_action'] = ['staff_user','action','subject','created_at','details', 'context']
    HEADER_ATTRS_FOR['screened_email'] = ['email','action','match_count','last_match_at','created_at','ip_address']
    HEADER_ATTRS_FOR['screened_ip'] = ['ip_address','action','match_count','last_match_at','created_at']
    HEADER_ATTRS_FOR['screened_url'] = ['domain','action','match_count','last_match_at','created_at']

    sidekiq_options retry: false
    attr_accessor :current_user

    def execute(args)
      @entity = args[:entity]
      @file_name = @entity
      @current_user = User.find_by(id: args[:user_id])

      export_method = "#{@entity}_export".to_sym
      data =
        if respond_to?(export_method)
          send(export_method)
        else
          raise Discourse::InvalidParameters.new(:entity)
        end

      if data && data.length > 0
        set_file_path
        write_csv_file(data)
      end

    ensure
      notify_user
    end

    def user_archive_export
      user_archive_data = Post.includes(:topic => :category).where(user_id: @current_user.id).select('topic_id','post_number','raw','like_count','reply_count','created_at').order('created_at').with_deleted.to_a
      user_archive_data.map do |user_archive|
        get_user_archive_fields(user_archive)
      end
    end

    def user_list_export
      query = ::AdminUserIndexQuery.new
      user_data = query.find_users_query.to_a
      user_data.map do |user|
        group_names = get_group_names(user).join(';')
        user_array = get_user_list_fields(user)
        user_array.push(group_names) if group_names != ''
        user_array
      end
    end

    def staff_action_export
      if @current_user.admin?
        staff_action_data = UserHistory.only_staff_actions.order('id DESC').to_a
      else
        # moderator
        staff_action_data = UserHistory.where(admin_only: false).only_staff_actions.order('id DESC').to_a
      end

      staff_action_data.map do |staff_action|
        get_staff_action_fields(staff_action)
      end
    end

    def screened_email_export
      screened_email_data = ScreenedEmail.order('last_match_at desc').to_a
      screened_email_data.map do |screened_email|
        get_screened_email_fields(screened_email)
      end
    end

    def screened_ip_export
      screened_ip_data = ScreenedIpAddress.order('id desc').to_a
      screened_ip_data.map do |screened_ip|
        get_screened_ip_fields(screened_ip)
      end
    end

    def screened_url_export
      screened_url_data = ScreenedUrl.select("domain, sum(match_count) as match_count, max(last_match_at) as last_match_at, min(created_at) as created_at").group(:domain).order('last_match_at DESC').to_a
      screened_url_data.map do |screened_url|
        get_screened_url_fields(screened_url)
      end
    end

    def get_header

      case @entity
        when 'user_list'
          header_array = HEADER_ATTRS_FOR['user_list'] + HEADER_ATTRS_FOR['user_stats']
          if SiteSetting.enable_sso
            header_array.concat(HEADER_ATTRS_FOR['user_sso'])
          end
          user_custom_fields = UserField.all
          if user_custom_fields.present?
            user_custom_fields.each do |custom_field|
              header_array.push("#{custom_field.name} (custom user field)")
            end
          end
          header_array.push("group_names")
        else
          header_array = HEADER_ATTRS_FOR[@entity]
        end

      header_array
    end

    private

      def get_group_names(user)
        group_names = []
        groups = user.groups
        groups.each do |group|
          group_names.push(group.name)
        end
        return group_names
      end

      def get_user_archive_fields(user_archive)
        user_archive_array = []
        topic_data = user_archive.topic
        user_archive = user_archive.as_json
        topic_data = Topic.with_deleted.find_by(id: user_archive['topic_id']) if topic_data.nil?
        return user_archive_array if topic_data.nil?
        category = topic_data.category
        sub_category = "-"
        if category
          category_name = category.name
          if !category.parent_category_id.nil?
            # sub category
            category_name = Category.find_by(id: category.parent_category_id).name
            sub_category = category.name
          end
        else
          # PM
          category_name = "-"
        end
        is_pm = topic_data.archetype == "private_message" ? I18n.t("csv_export.boolean_yes") : I18n.t("csv_export.boolean_no")
        url = "#{Discourse.base_uri}/t/#{topic_data.slug}/#{topic_data.id}/#{user_archive['post_number']}"

        topic_hash = {"post" => user_archive['raw'], "topic_title" => topic_data.title, "category" => category_name, "sub_category" => sub_category, "is_pm" => is_pm, "url" => url}
        user_archive.merge!(topic_hash)

        HEADER_ATTRS_FOR['user_archive'].each do |attr|
          user_archive_array.push(user_archive[attr])
        end

        user_archive_array
      end

      def get_user_list_fields(user)
        user_array = []

        HEADER_ATTRS_FOR['user_list'].each do |attr|
          user_array.push(user.attributes[attr])
        end

        HEADER_ATTRS_FOR['user_stats'].each do |stat|
          user_array.push(user.user_stat.attributes[stat])
        end

        if SiteSetting.enable_sso
          sso = user.single_sign_on_record
          HEADER_ATTRS_FOR['user_sso'].each do |stat|
            field = sso.attributes[stat] if sso
            user_array.push(field)
          end
        end

        if user.user_fields.present?
          user.user_fields.each do |custom_field|
            user_array.push(custom_field[1])
          end
        end

        user_array
      end

      def get_staff_action_fields(staff_action)
        staff_action_array = []

        HEADER_ATTRS_FOR['staff_action'].each do |attr|
          data =
            if attr == 'action'
              UserHistory.actions.key(staff_action.attributes[attr]).to_s
            elsif attr == 'staff_user'
              user = User.find_by(id: staff_action.attributes['acting_user_id'])
              user.username if !user.nil?
            else
              staff_action.attributes[attr]
            end

            staff_action_array.push(data)
        end

        staff_action_array
      end

      def get_screened_email_fields(screened_email)
        screened_email_array = []

        HEADER_ATTRS_FOR['screened_email'].each do |attr|
          data =
            if attr == 'action'
              ScreenedEmail.actions.key(screened_email.attributes['action_type']).to_s
            else
              screened_email.attributes[attr]
            end

          screened_email_array.push(data)
        end

        screened_email_array
      end

      def get_screened_ip_fields(screened_ip)
        screened_ip_array = []

        HEADER_ATTRS_FOR['screened_ip'].each do |attr|
          data =
            if attr == 'action'
              ScreenedIpAddress.actions.key(screened_ip.attributes['action_type']).to_s
            else
              screened_ip.attributes[attr]
            end

          screened_ip_array.push(data)
        end

        screened_ip_array
      end

      def get_screened_url_fields(screened_url)
        screened_url_array = []

        HEADER_ATTRS_FOR['screened_url'].each do |attr|
          data =
            if attr == 'action'
              action = ScreenedUrl.actions.key(screened_url.attributes['action_type']).to_s
              action = "do nothing" if action.blank?
            else
              screened_url.attributes[attr]
            end

          screened_url_array.push(data)
        end

        screened_url_array
      end


      def set_file_path
        if @entity == "user_archive"
          file_name_prefix = "#{@file_name.split('_').join('-')}-#{current_user.username}-#{Time.now.strftime("%y%m%d-%H%M%S")}"
        else
          file_name_prefix = "#{@file_name.split('_').join('-')}-#{Time.now.strftime("%y%m%d-%H%M%S")}"
        end
        @file = UserExport.create(file_name: file_name_prefix, user_id: @current_user.id)
        @file_name = "#{file_name_prefix}-#{@file.id}.csv"

        # ensure directory exists
        dir = File.dirname("#{UserExport.base_directory}/#{@file_name}")
        FileUtils.mkdir_p(dir) unless Dir.exists?(dir)
      end

      def write_csv_file(data)
        # write to CSV file
        CSV.open(File.expand_path("#{UserExport.base_directory}/#{@file_name}", __FILE__), "w") do |csv|
          csv << get_header
          data.each do |value|
            csv << value
          end
        end
        # compress CSV file
        `gzip -5 #{File.expand_path("#{UserExport.base_directory}/#{@file_name}", __FILE__)}`
      end

      def notify_user
        if @current_user
          if @file_name != "" && File.exists?("#{UserExport.base_directory}/#{@file_name}.gz")
            SystemMessage.create_from_system_user(@current_user, :csv_export_succeeded, download_link: "#{Discourse.base_uri}/export_csv/#{@file_name}.gz", file_name: "#{@file_name}.gz", file_size: number_to_human_size(File.size("#{UserExport.base_directory}/#{@file_name}.gz")))
          else
            SystemMessage.create_from_system_user(@current_user, :csv_export_failed)
          end
        end
      end

  end

end