module Eco
  module API
    class UseCases
      class OozeSamples
        module Helpers
          module Filters
            FILTER_TIME_FORMAT = '%Y-%m-%dT%H:%M:%SZ'

            def tags_filter(tags, any: true, negate: false)
              tags = [tags].flatten.compact
              return nil if tags.empty?
              key, name = field_key_name(:tags)
              {
                "tags": tags,
                "mode": any ? "any" : "all",
                "negate": negate,
                "key": key,
                "name": name,
                "type": "tag_filter"
              }
            end

            def date_range_filter(from: nil, to: nil, key: :updated_at)
              return nil unless from || to
              key, name = field_key_name(key)
              {
                "relstart": "today",
                "time_zone": "Pacific/Auckland",
                "relative": false,
                "key": key,
                "name": name,
                "type": "date_filter"
              }.tap do |out|
                out.merge!("lbound": to_date_filter(from)) if from
                out.merge!("ubound": to_date_filter(to)) if to
              end
            end

            def to_date_filter(date)
              daystart(date).utc.strftime(FILTER_TIME_FORMAT)
            end

            def set_time(date, h, m, s); Time.new(date.year, date.month, date.day, h, m, s); end
            def weeks(num); num * days(7); end
            def days(num);  num * 60 * 60 * 24; end
            def today; Date.today.to_time; end
            def sunday(date); date + days(7 - weekday(date)); end
            def midnight(date); set_time(date, 23, 59, 59); end
            def daystart(date); set_time(date, 0, 0, 0); end
            def previous_sunday(date); midnight(sunday(date - weeks(1)));  end
            def this_monday(date); set_time(previous_sunday(as_at_date) + days(1), 0, 0, 0);  end

            def field_key_name(value)
              case value
              when :updated_at
                ["updated_at", "Last updated"]
              when :created_at
                ["created_at", "Page created"]
              when Ecoportal::API::V2::Page::Component
                [value.ref_backend, value.label]
              when :tags
                ["tags", "Location Tags"]
              else
                [nil , nil]
              end
            end
          end
        end
      end
    end
  end
end