# unpack geometry feature
# Reader - ADIwg JSON to internal data structure

# History:
#   Stan Smith 2016-11-10 added computedBbox computation
#   Stan Smith 2016-10-25 original script

require_relative 'module_geometryObject'
require_relative 'module_geometryProperties'
require_relative 'module_geometryCollection'
require 'adiwg/mdtranslator/internal/module_coordinates'

module ADIWG
    module Mdtranslator
        module Readers
            module MdJson

                module GeometryFeature

                    def self.unpack(hFeature, responseObj)

                        # return nil object if input is empty
                        if hFeature.empty?
                            responseObj[:readerExecutionMessages] << 'Geometry Feature object is empty'
                            responseObj[:readerExecutionPass] = false
                            return nil
                        end

                        # instance classes needed in script
                        intMetadataClass = InternalMetadata.new
                        intFeature = intMetadataClass.newGeometryFeature

                        # geometry feature - type (required)
                        if hFeature.has_key?('type')
                            if hFeature['type'] != ''
                                if hFeature['type'] == 'Feature'
                                    intFeature[:type] = hFeature['type']
                                else
                                    responseObj[:readerExecutionMessages] << 'Feature type must be Feature'
                                    responseObj[:readerExecutionPass] = false
                                    return nil
                                end
                            end
                        end
                        if intFeature[:type].nil? || intFeature[:type] == ''
                            responseObj[:readerExecutionMessages] << 'Feature is missing type'
                            responseObj[:readerExecutionPass] = false
                            return nil
                        end

                        # geometry feature - id
                        if hFeature.has_key?('id')
                            unless hFeature['id'] == ''
                                intFeature[:id] = hFeature['id']
                            end
                        end

                        # geometry feature - bounding box
                        if hFeature.has_key?('bbox')
                            unless hFeature['bbox'].empty?
                                intFeature[:bbox] = hFeature['bbox']
                            end
                        end

                        # geometry feature - geometry (required, but may be JSON null)
                        if hFeature.has_key?('geometry')
                            unless hFeature['geometry'].empty?
                                hGeometry =  hFeature['geometry']
                                if hGeometry['type'] == 'GeometryCollection'
                                    hReturn = GeometryCollection.unpack(hGeometry, responseObj)
                                else
                                    hReturn = GeometryObject.unpack(hGeometry, responseObj)
                                end
                                unless hReturn.nil?
                                    intFeature[:geometryObject] = hReturn
                                end
                            end
                        else
                            responseObj[:readerExecutionMessages] << 'Feature is missing geometry'
                            responseObj[:readerExecutionPass] = false
                            return nil
                        end

                        # geometry feature - properties
                        if hFeature.has_key?('properties')
                            hObject = hFeature['properties']
                            unless hObject.empty?
                                hReturn = GeometryProperties.unpack(hObject, responseObj)
                                unless hReturn.nil?
                                    intFeature[:properties] = hReturn
                                end
                            end
                        end

                        # geometry feature - computed bounding box for feature
                        unless intFeature[:geometryObject].empty?
                            intFeature[:computedBbox] = AdiwgCoordinates.computeBbox([intFeature[:geometryObject]])
                        end

                        # geometry feature - save native GeoJSON for feature
                        intFeature[:nativeGeoJson] = hFeature

                        return intFeature

                    end

                end

            end
        end
    end
end