module Ecoportal
  module API
    class V2
      # @attr_reader client [Common::Client] a `Common::Client` object that holds the configuration of the api connection.
      class S3
        class MissingLocalFile < ArgumentError; end
        class CredentialsGetFailed < StandardError; end

        extend Common::BaseClass

        class_resolver :data_class, "Ecoportal::API::V2::S3::Data"
        class_resolver :files_class, "Ecoportal::API::V2::S3::Files"

        attr_reader :client

        # @param client [Common::Client] a `Common::Client` object that holds the configuration of the api connection.
        # @return [Schemas] an instance object ready to make schema api requests.
        def initialize(client)
          @client = client
        end

        # Gets the S3 credentials to upload files
        # @return [Ecoportal::API::V2::S3::Data]
        def data
          response = client.get("/s3/data")
          body     = body_data(response.body)

          return data_class.new(body) if response.success?

          msg = "Could not get S3 credentials - Error #{response.status}: #{body}"
          raise CredentialsGetFailed, msg
        end

        # @param file [String] full path to existing local file
        # @param credentials [Ecoportal::API::V2::S3::Data, NilClass]
        # @return [Hash, NilClass] with the s3_file_reference on success, and `nil` otherwise
        def upload_file(file, credentials: data, &block)
          msg = "The file '#{file}' does not exist"
          raise MissingLocalFile, msg unless File.exist?(file)

          credentials ||= data
          Upload.new(credentials, file: file).upload!(&block)
        end

        # Obtain specific object for eP file api requests.
        # @return [Files] an instance object ready to make eP file api requests.
        def files
          files_class.new(client, s3_api: self)
        end

        private

        def body_data(body)
          return body unless body.is_a?(Hash)
          return body unless body.key?("data")

          body["data"]
        end
      end
    end
  end
end

require 'ecoportal/api/v2/s3/data'
require 'ecoportal/api/v2/s3/upload'
require 'ecoportal/api/v2/s3/files'