module GPSBabel

# File lib/gpsbabel.rb, line 9
def self.convert attributes

        # Check valid input attributes are there
        unless (attributes.is_a? Hash) &&
                        (attributes.has_key? :input) &&
                        (attributes[:input].has_key? :format) &&
                        (attributes[:input].has_key? :file)
                raise MissingAttributesException.new "Missing attributes"
        end

        # Merge options
        options = {
                waypoints: true,
                routes: true,
                tracks: true,
                gpsbabel: 'gpsbabel'
        }
        if attributes.has_key? :options
                options.merge! attributes[:options]
        end

        # Ensure gpsbabel command-line application is installed.
        Cliver.detect! options[:gpsbabel]

        # Check input file exists
        unless File.exists? attributes[:input][:file]
                raise FileNotFoundException.new "Unable to open #{attributes[:input][:file]}"
        end

        # Merge output
        output = {
                format: 'gpx',
                gpxver: '1.1',
                file: File.join(File.dirname(attributes[:input][:file]), File.basename(attributes[:input][:file], File.extname(attributes[:input][:file])) + ".gpx")
        }
        if attributes.has_key? :output
                output.merge! attributes[:output]
        end

        # Build gpsbabel command
        cmd = options[:gpsbabel]

        if options[:waypoints]
                cmd << " -w"
        end
        if options[:tracks]
                cmd << " -t"
        end
        if options[:routes]
                cmd << " -r"
        end

        cmd << " -i #{attributes[:input][:format]} -f #{attributes[:input][:file]}"
        cmd << " -o #{output[:format]}"
        if output[:format] == 'gpx'
                cmd << ",gpxver=#{output[:gpxver]}"
        end
        cmd << " -F #{output[:file]}"

        if system cmd
                output[:file]
        else
                false
        end
end