rdavid1099/poke-api-v2

# Simple object to handle all data fetching and parsing
class Fetcher
  class << self
    def get_endpoints(unnamed_resource, endpoint_opts, **opts)
      endpoints = sanitize_endpoints(unnamed_resource, endpoint_opts)
      endpoints.map do |key, value|
        Fetcher.initialize_klass(key, value, opts)
      end.first
    end

    def initialize_klass(key, value, opts)
      klass = value.class == Hash ? PokeApi::ApiResourceList : ENDPOINT_OBJECTS[key]
      begin
        klass.new(call(key, value))
      rescue JSON::ParserError
        ErrorHandling.results_not_found(key, value) if opts[:throw_error]
      end
    end

    def call(endpoint, query = nil)
      ErrorHandling.undefined_endpoint(endpoint) unless ENDPOINT_OBJECTS[endpoint]

      path = "#{BASE_URI}#{endpoint.to_s.tr('_', '-')}/#{sanitize_query(query)}"
      call_uri(path).merge(resource_name: endpoint)
    end

    def call_uri(path)
      uri  = URI(path)
      resp = Net::HTTP.get(uri)
      JSON.parse(resp, symbolize_names: true).merge(url: path)
    end

    def sanitize_query(query)
      return query unless query.is_a? Hash

      query[:limit] ||= 20
      query[:offset] = query[:page] ? query[:limit] * (query[:page] - 1) : (query[:offset] || 0)
      query.reduce('?') do |result, param|
        key, value = param
        result + (key == :page ? '' : "#{key}=#{value}&")
      end.chop
    end

    def sanitize_endpoints(unnamed_resource, endpoint_opts)
      ErrorHandling.unnamed_resource_args if unnamed_resource && !endpoint_opts.empty?

      endpoint_opts[unnamed_resource] = { limit: 20 } if unnamed_resource
      endpoint_opts
    end
  end
end