# frozen_string_literal: true

module GrapeSwagger
  module Endpoint
    class ParamsParser
      attr_reader :params, :settings

      def self.parse_request_params(params, settings)
        new(params, settings).parse_request_params
      end

      def initialize(params, settings)
        @params = params
        @settings = settings
      end

      def parse_request_params
        array_keys = []
        public_params.each_with_object({}) do |(name, options), memo|
          name = name.to_s
          param_type = options[:type]
          param_type = param_type.to_s unless param_type.nil?

          if param_type_is_array?(param_type)
            array_keys << name
            options[:is_array] = true

            name += '[]' if array_use_braces?(options)
          else
            keys = array_keys.find_all { |key| name.start_with? "#{key}[" }
            if keys.any?
              options[:is_array] = true
              if array_use_braces?(options)
                keys.sort.reverse_each do |key|
                  name = name.sub(key, "#{key}[]")
                end
              end
            end
          end

          memo[name] = options unless %w[Hash Array].include?(param_type) && !options.key?(:documentation)
        end
      end

      private

      def array_use_braces?(options)
        settings[:array_use_braces] && !(options[:documentation] && options[:documentation][:param_type] == 'body')
      end

      def param_type_is_array?(param_type)
        return false unless param_type
        return true if param_type == 'Array'

        param_types = param_type.match(/\[(.*)\]$/)
        return false unless param_types

        param_types = param_types[0].split(',') if param_types
        param_types.size == 1
      end

      def public_params
        params.select { |param| public_parameter?(param) }
      end

      def public_parameter?(param)
        param_options = param.last
        return true unless param_options.key?(:documentation) && !param_options[:required]

        param_hidden = param_options[:documentation].fetch(:hidden, false)
        param_hidden = param_hidden.call if param_hidden.is_a?(Proc)
        !param_hidden
      end
    end
  end
end