skcc321/ocean-names

# frozen_string_literal: true

require "ocean_names/version"
require "ocean_names/polygon"
require "oj"

module OceanNames
  class Error < StandardError; end

  # drill down to main geometry points array
  GET_POINTS = ->(arg) {
    return arg unless arg.first.first.is_a?(Array)

    GET_POINTS.(arg.first)
  }

  # check bounds to avoid
  WITHIN_BOUNDS = ->(record, x, y) {
    record["min_lng"] <= x &&
    record["max_lng"] >= x &&
    record["min_lat"] <= y &&
    record["max_lat"] >= y
  }

  def self.reverse_geocode(lat:, lng:)
    rec = data.find do |record|
      # avoid check of obviously false geometries
      next unless WITHIN_BOUNDS.(record, lng, lat)

      record["geometry"].any? do |geometry|
        # get points from nested arrays
        points = GET_POINTS.(geometry)
        polygon = OceanNames::Polygon.new(points)
        polygon.contains?(lat: lat, lng: lng)
      end
    end

    rec&.reject do |key|
      key == "geometry"
    end
  end

  def self.file
    File.expand_path("../data/water.json", File.dirname(__FILE__))
  end

  def self.data
    @data ||= Oj.load(File.read(file))
  end
end