# frozen_string_literal: true

require 'roda/endpoints'
require 'roda/endpoints/transactions'
require 'inflecto'

class Roda
  module Endpoints
    class Endpoint
      module ClassInterface
        # @return [<Symbol>]
        attr_accessor :attributes

        # @return [{Symbol=>Object}]
        attr_accessor :defaults

        # @return [{Symbol=>{Symbol=>Symbol}}]
        attr_accessor :statuses

        # @return [<Symbol>]
        attr_accessor :verbs

        # @param [Symbol] key
        def define_attribute(key)
          attr_reader key
        end

        # @return [Dry::Container]
        def container
          @container ||= Roda::Endpoints.container
        end

        # @param [Class] child
        def inherited(child)
          child.attributes = attributes.dup
          child.defaults = defaults.dup
          child.statuses = statuses.dup
          child.verbs = verbs.dup
          child.transactions = transactions.dup
          child.route(&@route_block)
          super
        end

        def ns
          @ns ||= name.gsub(/^Roda::Endpoints::/, '').underscore.tr('/', '.')
        end

        # @return [Symbol]
        def type
          @type ||= Inflecto.underscore(Inflecto.demodulize(name)).to_sym
        end

        # @param [Symbol] verb
        # @param [Proc] block
        # @return [Symbol] name of the defined method
        def verb(verb, rescue_from: [], &block)
          self.verbs ||= superclass.verbs
          (self.verbs += [verb]).freeze
          rescue_from = Array(rescue_from).flatten
          if rescue_from.any?
            block = proc do |*args|
              begin
                instance_exec(*args, &block)
              rescue *rescue_from
                Left($ERROR_INFO)
              end
            end
          end
          define_method(verb, &block)
          key = "operations.#{type}.#{verb}"
          container.register key, block
        end

        # @param [String, Symbol] key
        # @param [Proc] block
        #
        # @example
        #   r.collection :articles do |articles|
        #     # register validation at 'validations.endpoints.articles.default'
        #     articles.validate do
        #       required(:title).filled?
        #       required(:contents).filled?
        #     end
        #     # redefine validation for patch method at
        #     # 'validations.endpoints.articles.patch'
        #     articles.validate(:patch) do
        #       required(:title).filled?
        #       required(:contents).filled?
        #       require(:confirm_changes).
        #     end
        #   end
        def validate(key = :default, &block)
          key = "validations.#{ns}.#{key}" if key.is_a?(Symbol)
          schema = Dry::Validation.Form(&block)
          container.register(key) do |params|
            validation = schema.call(params)
            if validation.success?
              Right(validation.output)
            else
              Left([:unprocessable_entity, {}, validation])
            end
          end
          schema
        end
        # rubocop:enable Metrics/MethodLength

        # @param [Proc] block
        # @return [Proc]
        def route(&block)
          @route_block = block if block_given?
          @route_block
        end

        def transaction(name, &block)
          transactions << [name, block]
        end

        # @return [(Symbol, Hash, Proc)]
        def transactions
          @transactions ||= []
        end

        attr_writer :transactions
      end
    end
  end
end