# frozen_string_literal: true

require 'faraday_middleware'

module ErpIntegration
  module Clients
    # The `FulfilClient` is a simple HTTP client configured to be used for API
    # requests to the Fulfil endpoints.
    class FulfilClient
      attr_reader :api_key, :merchant_id
      attr_writer :connection, :faraday_adapter

      def initialize(api_key:, merchant_id:)
        @api_key = api_key
        @merchant_id = merchant_id
      end

      # Generates the url prefix for the Faraday connection client.
      # @return [String] The base url for the Fulfil HTTP client
      def base_url
        "https://#{merchant_id}.fulfil.io/"
      end

      # Sets the default adapter for the Faraday Connection.
      # @return [Symbol] The default Faraday adapter
      def faraday_adapter
        @faraday_adapter ||= Faraday.default_adapter
      end

      # Sets up the Faraday connection to talk to the Fulfil API.
      # @return [Faraday::Connection] The configured Faraday connection
      def connection
        @connection ||= Faraday.new(url: base_url) do |faraday|
          faraday.headers = default_headers

          faraday.request :json # Encode request bodies as JSON
          faraday.request :retry # Retry transient failures

          faraday.response :follow_redirects
          faraday.response :json # Decode response bodies as JSON

          # Custom error handling for the error response
          faraday.use ErpIntegration::Middleware::ErrorHandling

          # Adapter definition should be last in order to make the json parsers be loaded correctly
          faraday.adapter faraday_adapter
        end
      end

      %i[delete get patch put post].each do |action_name|
        define_method(action_name) do |path, options = {}|
          connection.public_send(action_name, "api/#{version}/#{path}", options).body
        end
      end

      # Sets the default version for the Fulfil API endpoints.
      # @return [String] The Fulfil API version to be used
      def version
        @version ||= 'v2'
      end

      private

      def default_headers
        {
          'Accept': 'application/json',
          'Content-Type': 'application/json',
          'X-API-KEY': api_key
        }
      end
    end
  end
end