require_relative "base"

class GdsApi::Imminence < GdsApi::Base
  def api_url(type, params)
    vals = %i[limit lat lng postcode].select { |p| params.include? p }
    querystring = URI.encode_www_form(vals.map { |p| [p, params[p]] })
    "#{@endpoint}/places/#{type}.json?#{querystring}"
  end

  def places(type, lat, lon, limit = 5)
    url = api_url(type, lat: lat, lng: lon, limit: limit)
    places = get_json(url) || []
    places.map { |p| self.class.parse_place_hash(p) }
  end

  def places_for_postcode(type, postcode, limit = 5)
    url = api_url(type, postcode: postcode, limit: limit)
    places = get_json(url) || []
    places.map { |p| self.class.parse_place_hash(p) }
  end

  def self.parse_place_hash(place_hash)
    location = extract_location_hash(place_hash["location"])
    address = extract_address_hash(place_hash)

    place_hash.merge(location).merge(address)
  end

  def places_kml(type)
    get_raw("#{@endpoint}/places/#{type}.kml").body
  end

  def areas_for_postcode(postcode)
    url = "#{@endpoint}/areas/#{uri_encode(postcode)}.json"
    get_json(url)
  end

  def areas_for_type(type)
    url = "#{@endpoint}/areas/#{type}.json"
    get_json(url)
  end

  # @private
  def self.extract_location_hash(location)
    # Deal with all known location formats:
    #   Old style: [latitude, longitude]; empty array for no location
    #   New style: hash with keys "longitude", "latitude"; nil for no location
    case location
    when Array
      { "latitude" => location[0], "longitude" => location[1] }
    when Hash
      location
    when nil
      { "latitude" => nil, "longitude" => nil }
    end
  end

  # @private
  def self.extract_address_hash(place_hash)
    address_fields = [
      place_hash["address1"],
      place_hash["address2"],
    ].reject { |a| a.nil? || a == "" }
    { "address" => address_fields.map(&:strip).join(", ") }
  end
end