class Maglev::RenameSectionType

def call
  validate_section_types!
  ActiveRecord::Base.transaction do
    rename_resource_sections(site)
    site_pages.find_each do |page|
      rename_resource_sections(page)
    end
  end
  true
end

def change_section_type(sections, old_type, new_type)
  return if sections.blank?
  sections.each do |section|
    section['type'] = new_type if section['type'] == old_type
  end
end

def rename_resource_sections(resource)
  site.each_locale do |locale|
    Maglev::I18n.with_locale(locale) do
      change_section_type(resource.sections, old_type, new_type)
    end
  end
  resource.save!
end

def site_pages
  Maglev::Page
end

def validate_section_types!
  return if theme.sections.find(new_type)
  raise Maglev::Errors::UnknownSection,
        "New section type '#{new_type}' doesn't exist in the theme"
end