require 'net/http'

module SolanaRpcRuby
  ##
  # ApiClient class serves as a client for solana JSON RPC API.
  # @see https://docs.solana.com/developing/clients/jsonrpc-api
  class ApiClient
    # Determines which cluster will be used to send requests.
    # @return [String]
    attr_accessor :cluster

    # Default headers.
    # @return [Hash]
    attr_accessor :default_headers

    # Initialize object with cluster address where requests will be sent.
    # 
    # @param cluster [String] 
    def initialize(cluster = nil)
      @cluster = cluster || SolanaRpcRuby.cluster

      message = 'Cluster is missing. Please provide default cluster in config or pass it to the client directly.'
      raise ArgumentError, message unless @cluster
    end
    
    # Sends request to the api.
    #
    # @param body [Hash] 
    # @param http_method [Symbol]
    # @param params [Hash]
    # 
    # @return [Object] Net::HTTPOK
    def call_api(body:, http_method:, params: {})
      uri = URI(@cluster)
      rpc_response = Net::HTTP.public_send(
        http_method, 
        uri, 
        body, 
        default_headers, 
      )

      rpc_response

    rescue Timeout::Error,
           Net::HTTPError,
           Net::HTTPNotFound,
           Net::HTTPServerException,
           Net::HTTPFatalError,
           Net::ReadTimeout => e

      fail ApiError.new(message: e.message)
    rescue StandardError => e
      message = "#{e.class} #{e.message}\n Backtrace: \n #{e.backtrace}"
      fail ApiError.new(message: message)
    end

    private

    def default_headers
      { "Content-Type" => "application/json" }
    end
  end
end