# Copyright (C) 2012-2016 Zammad Foundation, http://zammad-foundation.org/

class Organization
  module Search
    extend ActiveSupport::Concern

    # methods defined here are going to extend the class, not the instance of it
    class_methods do

=begin

search organizations preferences

  result = Organization.search_preferences(user_model)

returns if user has permissions to search

  result = {
    prio: 1000,
    direct_search_index: true
  }

returns if user has no permissions to search

  result = false

=end

      def search_preferences(current_user)
        return false if !current_user.permissions?('ticket.agent') && !current_user.permissions?('admin.organization')
        {
          prio: 1000,
          direct_search_index: true,
        }
      end

=begin

search organizations

  result = Organization.search(
    current_user: User.find(123),
    query: 'search something',
    limit: 15,
    offset: 100,
  )

returns

  result = [organization_model1, organization_model2]

=end

      def search(params)

        # get params
        query = params[:query]
        limit = params[:limit] || 10
        offset = params[:offset] || 0
        current_user = params[:current_user]

        # enable search only for agents and admins
        return [] if !search_preferences(current_user)

        # try search index backend
        if SearchIndexBackend.enabled?
          items = SearchIndexBackend.search(query, limit, 'Organization', {}, offset)
          organizations = []
          items.each do |item|
            organization = Organization.lookup(id: item[:id])
            next if !organization
            organizations.push organization
          end
          return organizations
        end

        # fallback do sql query
        # - stip out * we already search for *query* -
        query.delete! '*'
        organizations = Organization.where(
          'name LIKE ? OR note LIKE ?', "%#{query}%", "%#{query}%"
        ).order('name').offset(offset).limit(limit).to_a

        # use result independent of size if an explicit offset is given
        # this is the case for e.g. paginated searches
        return organizations if params[:offset].present?
        return organizations if organizations.length > 3

        # if only a few organizations are found, search for names of users
        organizations_by_user = Organization.select('DISTINCT(organizations.id), organizations.name').joins('LEFT OUTER JOIN users ON users.organization_id = organizations.id').where(
          'users.firstname LIKE ? or users.lastname LIKE ? or users.email LIKE ?', "%#{query}%", "%#{query}%", "%#{query}%"
        ).order('organizations.name').limit(limit)

        organizations_by_user.each do |organization_by_user|

          organization_exists = false
          organizations.each do |organization|
            next if organization.id != organization_by_user.id
            organization_exists = true
            break
          end

          # get model with full data
          next if organization_exists
          organizations.push Organization.find(organization_by_user.id)
        end
        organizations
      end
    end
  end
end