# frozen_string_literal: true

module Apicasso
  # Controller used to generate an application Swagger JSON, used by
  # SwaggerUI to generate beautiful API documentation
  class ApidocsController < Apicasso::ApplicationController
    skip_before_action :restrict_access

    include Swagger::Blocks

    swagger_root do
      MODELS_EXCLUDED = [::ApplicationRecord, ActiveRecord::SchemaMigration, Apicasso::ApplicationRecord, Apicasso::Key, Apicasso::Request, Apicasso::ApidocsController, ActiveStorage::Attachment, ActiveStorage::Blob].freeze
      key :swagger, '2.0'
      info do
        key :title, ENV.fetch('APP_NAME', I18n.t('application.name'))
        key 'x-logo', { url: I18n.t('app.logo.url', default: 'https://raw.githubusercontent.com/ErvalhouS/APIcasso/master/APIcasso.png'), altText: I18n.t('app.logo.alttext', default: 'Application Logo')}
        key :description, ENV.fetch('APP_DESCRIPTION', I18n.t('application.description'))
        key :termsOfService, I18n.t('application.terms_of_service')
        contact do
          key :name, I18n.t('application.contact_name')
        end
        license do
          key :name, I18n.t('application.license')
        end
      end
      ActiveRecord::Base.descendants.each do |model|
        unless MODELS_EXCLUDED.include?(model)
          tag do
            key :name, I18n.t("activerecord.models.#{model.name.underscore}", default: model.name.underscore)
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.description", default: model.name)
          end
        end
      end
      key :host, I18n.t('application.apicasso_host', default: ENV.fetch('ROOT', 'localhost:3000'))
      key :basePath, I18n.t('application.apicasso_path', default: '/')
      key :consumes, ['application/json']
      key :produces, ['application/json']

      security_definition :api_key do
        key :type, :apiKey
        key :name, :api_key
        key :in, :header
      end
    end

    # Eager load application to be able to list all models
    Rails.application.eager_load! unless Rails.configuration.cache_classes
    # A list of all classes that have swagger_* declarations, which gets injected
    # by this gem in all `ActiveRecord::Base` classes
    SWAGGERED_CLASSES = [
      *ActiveRecord::Base.descendants,
      self
    ].freeze
    swagger_schema :ErrorModel do
      key :required, [:code, :message]
      property :code do
        key :type, :integer
        key :format, :int32
      end
      property :message do
        key :type, :string
      end
    end

    SWAGGERED_CLASSES.each do |klass|
      unless MODELS_EXCLUDED.include?(klass)
        swagger_schema klass.name.to_sym do
          key :required, klass.presence_validators if klass.presence_validators?
          klass.columns_hash.each do |name, type|
            property name.to_sym do
              key :type, type.type
            end
          end
        end
        swagger_schema "#{klass.name}Input".to_sym do
          allOf do
            schema do
              key :'$ref', "#{klass.name}Input".to_sym
            end
            schema do
              key :required, %i[*presence_validators] if klass.presence_validators?
              klass.columns_hash.each do |name, type|
                property name.to_sym do
                  key :type, type.type
                end
              end
            end
          end
        end
        swagger_schema "#{klass.name}Metadata".to_sym do
          allOf do
            schema do
              key :'$ref', "#{klass.name}Metadata".to_sym
            end
            schema do
              klass.columns_hash.each do |name, type|
                property name.to_sym do
                  key :description, type.type
                  key :type, :string
                end
              end
            end
          end
        end
      end
    end

    ActiveRecord::Base.descendants.each do |model|
      unless MODELS_EXCLUDED.include?(model)
        swagger_path "/#{model.name.underscore}" do
          operation :get do
            key :summary, I18n.t("activerecord.models.#{model.name.underscore}.index.summary", default: model.name)
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.index.description", default: model.name)
            key :operationId, "find#{model.name.pluralize}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            parameter do
              key :name, :sort
              key :in, :query
              key :description, I18n.t('apicasso.sort.description',
                                      default: 'Parameters sorting splitted by `,` preffixed by `+` or `-` which translates into ascending or descending order')
              key :required, false
              key :type, :string
              key :collectionFormat, :json
            end
            parameter do
              key :name, :q
              key :in, :query
              key :description, I18n.t('apicasso.q.description',
                                      default: 'Records filtering by attribute and search query as affix. Usage: `?q[{attribute}{search_affix}]={matcher}`. All available search affixes are listed on: https://github.com/activerecord-hackery/ransack#search-matchers')
              key :required, false
              key :type, :json
            end
            parameter do
              key :name, :page
              key :in, :query
              key :description, I18n.t('apicasso.page.description',
                                      default: 'Records pagination paging, which offsets collection based on `params[:per_page]`')
              key :required, false
              key :type, :integer
            end
            parameter do
              key :name, :per_page
              key :in, :query
              key :description, I18n.t('apicasso.per_page.description',
                                      default: 'Records pagination size, which sets how many records will be rendered per request')
              key :required, false
              key :type, :integer
            end
            response 200 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.index.response",
                                      default: "#{model.name} response, which include records matching current query and pagination metadata")
              schema do
                key :name, :total
                key :description, I18n.t('apicasso.total.description',
                                        default: 'Total records contained in current collection, as if there was no pagination.')
                key :required, true
                key :type, :integer
              end
              schema do
                key :name, :total_pages
                key :description, I18n.t('apicasso.total_pages.description',
                                        default: 'How many pages of data the current collection has.')
                key :required, true
                key :type, :integer
              end
              schema do
                key :name, :last_page
                key :description, I18n.t('apicasso.last_page.description',
                                        default: 'An indication if current request is the last to paginate in the current collection')
                key :required, true
                key :type, :boolean
              end
              schema do
                key :name, :previous_page
                key :description, I18n.t('apicasso.previous_page.description',
                                        default: "The link of the previous page for the current collection. It can be null if there isn't any")
                key :required, false
                key :type, :string
              end
              schema do
                key :name, :next_page
                key :description, I18n.t('apicasso.next_page.description',
                                        default: "The link of the next page for the current collection. It can be null if there isn't any")
                key :required, false
                key :type, :string
              end
              schema do
                key :name, :out_of_bounds
                key :description, I18n.t('apicasso.out_of_bounds.description',
                                        default: 'An indication if current request is out of pagination bounds for the current collection')
                key :required, true
                key :type, :boolean
              end
              schema do
                key :name, :offset
                key :description, I18n.t('apicasso.offset.description',
                                        default: 'How many records were offsetted from the collection to render the current page')
                key :required, true
                key :type, :integer
              end
              schema do
                key :name, :entries
                key :description, I18n.t('apicasso.entries.description',
                                        default: 'The records collection in the current pagination scope.')
                key :required, true
                key :type, :array
                items do
                  key :'$ref', model.name.to_sym
                end
              end
            end
          end
          operation :options do
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.schema.description",
                                    default: "#{model.name} metadata information.")
            key :operationId, "schema#{model.name.pluralize}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            response 200 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.schema.response",
                                      default: "#{model.name} metadata as a json with field names as keys and field types as values.")
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
          end
          operation :post do
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.create.response",
                                    default: "Creates a #{model.name}")
            key :operationId, "add#{model.name}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            parameter do
              key :name, model.name.underscore.to_sym
              key :in, :body
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.create.description",
                                    default: "#{model.name} to add into application")
              key :required, true
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
            response 201 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.show.description",
                                      default: "#{model.name} response")
              schema do
                key :'$ref', model.name.to_sym
              end
            end
          end
        end
        swagger_path "/#{model.name.underscore}/{id}" do
          operation :patch do
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.update.response",
                                    default: "Updates a #{model.name}")
            key :operationId, "edit#{model.name}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            parameter do
              key :name, :id
              key :in, :path
              key :description, I18n.t("activerecord.models.attributes.#{model.name.underscore}.id",
                                      default: "ID of #{model.name} to update on the application")
              key :required, true
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
            parameter do
              key :name, model.name.underscore.to_sym
              key :in, :body
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.update.description",
                                      default: "Existing #{model.name} to update on the application")
              key :required, true
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
            response 200 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.show.description",
                                      default: "#{model.name} response")
              schema do
                key :'$ref', model.name.to_sym
              end
            end
          end
          operation :get do
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.show.response",
                                    default: "Creates a #{model.name}")
            key :operationId, "show#{model.name}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            parameter do
              key :name, :id
              key :in, :path
              key :description, I18n.t("activerecord.models.attributes.#{model.name.underscore}.id",
                                      default: "ID of #{model.name} to fetch on the application")
              key :required, true
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
            response 200 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.show.description",
                                      default: "#{model.name} response")
              schema do
                key :'$ref', model.name.to_sym
              end
            end
          end
          operation :delete do
            key :description, I18n.t("activerecord.models.#{model.name.underscore}.destroy.response",
                                    default: "Deletes a #{model.name}")
            key :operationId, "destroy#{model.name}"
            key :produces, ['application/json']
            key :tags, [model.name.underscore]
            parameter do
              key :name, :id
              key :in, :path
              key :description, I18n.t("activerecord.models.attributes.#{model.name.underscore}.id",
                                      default: "ID of #{model.name} to delete on the application")
              key :required, true
              schema do
                key :'$ref', "#{model.name}".to_sym
              end
            end
            response 200 do
              key :description, I18n.t("activerecord.models.#{model.name.underscore}.destroy.description",
                                      default: "#{model.name} response")
            end
          end
        end

        model.reflect_on_all_associations.map(&:name).each do |association|
          inner_name = model.reflect_on_all_associations.select{ |ass| ass.name == association }.first.class_name
          ASSOCIATION_EXCLUDED = ['ActiveStorage::Attachment', 'ActiveStorage::Blob'].freeze
          unless ASSOCIATION_EXCLUDED.include?(inner_name)
            inner_klass = begin inner_name.constantize rescue NameError; false end
            swagger_path "/#{model.name.underscore}/{id}/#{association}" do
              operation :get do
                key :summary, I18n.t("activerecord.models.#{inner_name.underscore}.index.summary", default: inner_name)
                key :description, I18n.t("activerecord.models.#{inner_name.underscore}.index.description", default: inner_name)
                key :operationId, "find#{inner_name.pluralize}"
                key :produces, ['application/json']
                key :tags, [inner_name.underscore]
                parameter do
                  key :name, :sort
                  key :in, :query
                  key :description, I18n.t('apicasso.sort.description',
                                          default: 'Parameters sorting splitted by `,` preffixed by `+` or `-` which translates into ascending or descending order')
                  key :required, false
                  key :type, :string
                  key :collectionFormat, :json
                end
                parameter do
                  key :name, :q
                  key :in, :query
                  key :description, I18n.t('apicasso.q.description',
                                          default: 'Records filtering by attribute and search query as affix. Usage: `?q[{attribute}{search_affix}]={matcher}`. All available search affixes are listed on: https://github.com/activerecord-hackery/ransack#search-matchers')
                  key :required, false
                  key :type, :json
                end
                parameter do
                  key :name, :page
                  key :in, :query
                  key :description, I18n.t('apicasso.page.description',
                                          default: 'Records pagination paging, which offsets collection based on `params[:per_page]`')
                  key :required, false
                  key :type, :integer
                end
                parameter do
                  key :name, :per_page
                  key :in, :query
                  key :description, I18n.t('apicasso.per_page.description',
                                          default: 'Records pagination size, which sets how many records will be rendered per request')
                  key :required, false
                  key :type, :integer
                end
                response 200 do
                  key :description, I18n.t("activerecord.models.#{inner_name.underscore}.index.response",
                                          default: "#{inner_name} response, which include records matching current query and pagination metadata")
                  schema do
                    key :name, :total
                    key :description, I18n.t('apicasso.total.description',
                                            default: 'Total records contained in current collection, as if there was no pagination.')
                    key :required, true
                    key :type, :integer
                  end
                  schema do
                    key :name, :total_pages
                    key :description, I18n.t('apicasso.total_pages.description',
                                            default: 'How many pages of data the current collection has.')
                    key :required, true
                    key :type, :integer
                  end
                  schema do
                    key :name, :last_page
                    key :description, I18n.t('apicasso.last_page.description',
                                            default: 'An indication if current request is the last to paginate in the current collection')
                    key :required, true
                    key :type, :boolean
                  end
                  schema do
                    key :name, :previous_page
                    key :description, I18n.t('apicasso.previous_page.description',
                                            default: "The link of the previous page for the current collection. It can be null if there isn't any")
                    key :required, false
                    key :type, :string
                  end
                  schema do
                    key :name, :next_page
                    key :description, I18n.t('apicasso.next_page.description',
                                            default: "The link of the next page for the current collection. It can be null if there isn't any")
                    key :required, false
                    key :type, :string
                  end
                  schema do
                    key :name, :out_of_bounds
                    key :description, I18n.t('apicasso.out_of_bounds.description',
                                            default: 'An indication if current request is out of pagination bounds for the current collection')
                    key :required, true
                    key :type, :boolean
                  end
                  schema do
                    key :name, :offset
                    key :description, I18n.t('apicasso.offset.description',
                                            default: 'How many records were offsetted from the collection to render the current page')
                    key :required, true
                    key :type, :integer
                  end
                  schema do
                    key :name, :entries
                    key :description, I18n.t('apicasso.entries.description',
                                            default: 'The records collection in the current pagination scope.')
                    key :required, true
                    key :type, :array
                    items do
                      key :'$ref', "#{inner_name}".to_sym
                    end
                  end
                end
                response :default do
                  key :description, I18n.t("activerecord.errors.models.#{inner_name.underscore}",
                                          default: "Unexpected error in #{inner_name}")
                  schema do
                    key :'$ref', :ErrorModel
                  end
                end
              end
              operation :options do
                key :description, I18n.t("activerecord.models.#{inner_name.underscore}.schema.description",
                                        default: "#{inner_name} metadata information.")
                key :operationId, "schema#{inner_name.pluralize}"
                key :produces, ['application/json']
                key :tags, [inner_name.underscore]
                response 200 do
                  key :description, I18n.t("activerecord.models.#{inner_name.underscore}.schema.response",
                                          default: "#{inner_name} metadata as a json with field names as keys and field types as values.")
                  schema do
                    key :'$ref', "#{inner_name}".to_sym
                  end
                end
                response :default do
                  key :description, I18n.t("activerecord.errors.models.#{inner_name.underscore}",
                                          default: "Unexpected error in #{inner_name}")
                  schema do
                    key :'$ref', :ErrorModel
                  end
                end
              end
            end
          end
        end
      end
    end

    def index
      render json: Swagger::Blocks.build_root_json(SWAGGERED_CLASSES).to_json
    end
  end
end