# unpack temporal extent
# Reader - ADIwg JSON to internal data structure

# History:
# 	Stan Smith 2016-10-24 original script

require_relative 'module_timeInstant'
require_relative 'module_timePeriod'

module ADIWG
    module Mdtranslator
        module Readers
            module MdJson

                module TemporalExtent

                    def self.unpack(hTemporal, responseObj)

                        # return nil object if input is empty
                        if hTemporal.empty?
                            responseObj[:readerExecutionMessages] << 'Temporal Extent object is empty'
                            responseObj[:readerExecutionPass] = false
                            return nil
                        end

                        # instance classes needed in script
                        intMetadataClass = InternalMetadata.new
                        intTemporal = intMetadataClass.newTemporalExtent
                        haveOne = false

                        # temporal extent - time instant (required if not others)
                        if hTemporal.has_key?('timeInstant')
                            hTime = hTemporal['timeInstant']
                            unless hTime.empty?
                                hObject = TimeInstant.unpack(hTime, responseObj)
                                unless hObject.nil?
                                    intTemporal[:timeInstant] = hObject
                                    haveOne = true
                                end
                            end
                        end

                        # temporal extent - time period (required if not others)
                        if hTemporal.has_key?('timePeriod')
                            hTime = hTemporal['timePeriod']
                            unless hTime.empty?
                                hObject = TimePeriod.unpack(hTime, responseObj)
                                unless hObject.nil?
                                    intTemporal[:timePeriod] = hObject
                                    haveOne = true
                                end
                            end
                        end

                        unless haveOne
                            responseObj[:readerExecutionMessages] << 'Temporal Extent did not have an object of supported type'
                            responseObj[:readerExecutionPass] = false
                            return nil
                        end

                        return intTemporal

                    end

                end

            end
        end
    end
end