require "graphql"
if Gem::Version.new(GraphQL::VERSION) < Gem::Version.new("1.3")
  warn "graphql gem versions less than 1.3 are deprecated for use with graphql-batch, upgrade so lazy_resolve can be used"
end
require "promise.rb"

module GraphQL
  module Batch
    BrokenPromiseError = ::Promise::BrokenError
    class NoExecutorError < StandardError; end

    def self.batch(executor_class: GraphQL::Batch::Executor)
      begin
        GraphQL::Batch::Executor.start_batch(executor_class)
        ::Promise.sync(yield)
      ensure
        GraphQL::Batch::Executor.end_batch
      end
    end

    def self.use(schema_defn, executor_class: GraphQL::Batch::Executor)
      schema = schema_defn.target
      if GraphQL::VERSION >= "1.6.0"
        instrumentation = GraphQL::Batch::SetupMultiplex.new(schema, executor_class: executor_class)
        schema_defn.instrument(:multiplex, instrumentation)
        schema_defn.instrument(:field, instrumentation)
      else
        instrumentation = GraphQL::Batch::Setup.new(schema, executor_class: executor_class)
        schema_defn.instrument(:query, instrumentation)
        schema_defn.instrument(:field, instrumentation)
      end
      schema_defn.lazy_resolve(::Promise, :sync)
    end

    autoload :ExecutionStrategy, 'graphql/batch/execution_strategy'
    autoload :MutationExecutionStrategy, 'graphql/batch/mutation_execution_strategy'
  end
end

require_relative "batch/version"
require_relative "batch/loader"
require_relative "batch/executor"
require_relative "batch/promise"
require_relative "batch/setup"
require_relative "batch/setup_multiplex"