class APIGeoService
  class << self
    def countries(locale: I18n.locale)
      I18nData.countries(locale)
        .merge(get_localized_additional_countries(locale))
        .map { |(code, name)| { name:, code: } }
        .sort_by { I18n.transliterate(_1[:name].tr('î', 'Î')) }
    end

    def country_name(code, locale: I18n.locale)
      countries(locale:).find { _1[:code] == code }&.dig(:name)
    end

    def country_code(name)
      return if name.nil?
      code = I18nData.country_code(name) || I18nData.country_code(name.humanize) || I18nData.country_code(name.titleize)
      if code.nil?
        countries_index_fr[I18n.transliterate(name).upcase]&.dig(:code)
      else
        code
      end
    end

    def regions
      get_from_api_geo(:regions).sort_by { I18n.transliterate(_1[:name]) }
    end

    def region_name(code)
      regions.find { _1[:code] == code }&.dig(:name)
    end

    def region_code(name)
      return if name.nil?
      regions.find { _1[:name] == name }&.dig(:code)
    end

    def region_code_by_departement(code)
      return if code.nil?
      departements.find { _1[:code] == code }&.dig(:region_code)
    end

    def departements
      [{ code: '99', name: 'Etranger' }] + get_from_api_geo(:departements).sort_by { _1[:code] }
    end

    def departement_name(code)
      departements.find { _1[:code] == code }&.dig(:name)
    end

    def departement_code(name)
      return if name.nil?
      departements.find { _1[:name] == name }&.dig(:code)
    end

    def epcis(departement_code)
      get_from_api_geo("epcis-#{departement_code}").sort_by { I18n.transliterate(_1[:name]) }
    end

    def epci_name(departement_code, code)
      epcis(departement_code).find { _1[:code] == code }&.dig(:name)
    end

    def epci_code(departement_code, name)
      epcis(departement_code).find { _1[:name] == name }&.dig(:code)
    end

    def communes(departement_code)
      get_from_api_geo("communes-#{departement_code}").sort_by { I18n.transliterate([_1[:name], _1[:postal_code]].join(' ')) }
    end

    def communes_by_postal_code(postal_code)
      communes_by_postal_code_map.fetch(postal_code, [])
        .filter { !_1[:code].in?(['75056', '13055', '69123']) }
        .sort_by { I18n.transliterate([_1[:name], _1[:postal_code]].join(' ')) }
    end

    def commune_name(departement_code, code)
      communes(departement_code).find { _1[:code] == code }&.dig(:name)
    end

    def commune_code(departement_code, name)
      communes(departement_code).find { _1[:name] == name }&.dig(:code)
    end

    def commune_postal_codes(departement_code, code)
      communes(departement_code).filter { _1[:code] == code }.map { _1[:postal_code] }
    end

    def parse_ban_address(feature)
      return unless ban_address_schema.valid?(feature)

      properties = feature.fetch('properties')
      city_code = properties.fetch('citycode')

      territory = if properties['context'].present?
        department_code = properties.fetch('context').split(',').first
        region_code = region_code_by_departement(department_code)

        {
          department_name: departement_name(department_code),
          department_code:,
          region_name: region_name(region_code),
          region_code:,
          city_name: safely_normalize_city_name(department_code, city_code, properties['city']),
          city_code:
        }
      else
        {
          city_name: properties['city'],
          city_code:
        }
      end

      {
        label: properties.fetch('label'),
        type: properties.fetch('type'),
        street_address: properties.fetch('name'),
        postal_code: properties.fetch('postcode'),
        street_number: properties['housenumber'],
        street_name: properties['street'],
        geometry: feature['geometry']
      }.merge(territory)
    end

    def safely_normalize_city_name(department_code, city_code, fallback)
      return fallback if department_code.nil? || city_code.nil?

      commune_name(department_code, city_code) || fallback
    end

    private

    def communes_by_postal_code_map
      Rails.cache.fetch('api_geo_communes', expires_in: 1.day, version: 3) do
        departements
          .filter { _1[:code] != '99' }
          .flat_map { communes(_1[:code]) }
          .group_by { _1[:postal_code] }
      end
    end

    def get_from_api_geo(scope)
      Rails.cache.fetch("api_geo_#{scope}", expires_in: 1.day, version: 3) do
        JSON.parse(Rails.root.join('lib', 'data', 'api_geo', "#{scope}.json").read, symbolize_names: true)
      end
    end

    def countries_index_fr
      Rails.cache.fetch('countries_index_fr', expires_in: 1.week) do
        countries(locale: 'FR').index_by { I18n.transliterate(_1[:name]).upcase }
      end
    end

    def get_localized_additional_countries(locale)
      additional_countries[locale.to_s.upcase] || {}
    end

    def additional_countries
      {
        'FR' => { 'XK' => 'Kosovo' },
        'EN' => { 'XK' => 'Kosovo' }
      }
    end

    private

    def ban_address_schema
      JSONSchemer.schema(Rails.root.join('app/schemas/adresse-ban.json'))
    end
  end
end