# frozen_string_literal: true

require 'dato/json_api_serializer'
require 'dato/json_api_deserializer'
require 'dato/paginator'

module Dato
  class Repo
    attr_reader :client, :type, :schema

    IDENTITY_REGEXP = /\{\(.*?definitions%2F(.*?)%2Fdefinitions%2Fidentity\)}/

    METHOD_NAMES = {
      'instances' => :all,
      'self' => :find
    }.freeze

    def initialize(client, type, schema)
      @client = client
      @type = type
      @schema = schema
    end

    def respond_to_missing?(method, include_private = false)
      respond_to_missing = schema.links.any? do |link|
        METHOD_NAMES.fetch(link.rel, link.rel).to_sym == method.to_sym
      end

      respond_to_missing || super
    end

    private

    def method_missing(method, *args, &block)
      link = schema.links.find do |link|
        METHOD_NAMES.fetch(link.rel, link.rel).to_sym == method.to_sym
      end

      return super if !link

      min_arguments_count = [
        link.href.scan(IDENTITY_REGEXP).size,
        link.schema && link.method != :get ? 1 : 0
      ].reduce(0, :+)

      (args.size >= min_arguments_count) or
        raise ArgumentError, "wrong number of arguments (given #{args.size}, expected #{min_arguments_count})"

      placeholders = []

      url = link['href'].gsub(IDENTITY_REGEXP) do |_stuff|
        placeholder = args.shift.to_s
        placeholders << placeholder
        placeholder
      end

      response = if %i[post put].include?(link.method)
                   body = if link.schema
                            unserialized_body = args.shift

                            JsonApiSerializer.new(type, link).serialize(
                              unserialized_body,
                              link.method == :post ? nil : placeholders.last
                            )
                          else
                            {}
                          end

                   client.request(link.method, url, body)

                 elsif link.method == :delete
                   client.request(:delete, url)

                 elsif link.method == :get
                   query_string = args.shift

                   all_pages = (args[0] || {})
                     .symbolize_keys
                     .fetch(:all_pages, false)

                   if all_pages
                     Paginator.new(client, url, query_string).response
                   else
                     client.request(:get, url, query_string)
                   end
                 end

      options = if args.any?
                  args.shift.symbolize_keys
                else
                  {}
                end

      if options.fetch(:deserialize_response, true)
        JsonApiDeserializer.new(link).deserialize(response)
      else
        response
      end
    end
  end
end