class Jets::Resource::ApiGateway::RestApi::Routes::Change::Page

def changed?
  route_page_moved? || old_api_template?
end

def deployed_pages
  remote_logical_ids_map
end

def local_logical_ids_map(path_expression="#{Jets::Naming.template_path_prefix}-api-resources-*.yml")
  logical_ids = {} # logical id => page number
  Dir.glob(path_expression).each do |path|
    md = path.match(/-api-resources-(\d+).yml/)
    page_number = md[1]
    template = Jets::Cfn::BuiltTemplate.get(path)
    template['Resources'].keys.each do |logical_id|
      logical_ids[logical_id] = page_number
    end
  end
  logical_ids
end

def moved?(new_pages, deployed_pages)
  not_moved = true # page has not moved
  new_pages.each do |logical_id, new_page_number|
    if !deployed_pages[logical_id].nil? && deployed_pages[logical_id] != new_page_number
      not_moved = false # page has moved
      break
    end
  end
  !not_moved # moved
end

def new_pages
  local_logical_ids_map
end

def old_api_template?
  logical_resource_ids = parent_resources.map(&:logical_resource_id)
  api_gateway_found = logical_resource_ids.detect do |logical_id|
    logical_id == "ApiGateway"
  end
  return false unless api_gateway_found
  api_resources_found = logical_resource_ids.detect do |logical_id|
    logical_id.match(/^ApiResources\d+$/)
  end
  !api_resources_found # if api_resources_found then it's the new structure. so opposite is old structure
end

def parent_resources
  resp = cfn.describe_stack_resources(stack_name: Jets::Naming.parent_stack_name)
  resp.stack_resources
end

def remote_logical_ids_map
  logical_ids = {} # logical id => page number
  parent_resources.each do |resource|
    stack_name = resource.physical_resource_id # full physical id can be used as stack name also
    regexp = Regexp.new("#{Jets.config.project_namespace}-ApiResources(\\d+)-") # tricky to escape \d pattern
    md = stack_name.match(regexp)
    if md
      page_number = md[1]
      resp = cfn.describe_stack_resources(stack_name: stack_name)
      resp.stack_resources.map(&:logical_resource_id).each do |logical_id|
        logical_ids[logical_id] = page_number
      end
    end
  end
  logical_ids
end

def route_page_moved?
  moved?(new_pages, deployed_pages)
end