module RailsConnector
  # @api public
  module Migrations
    # @api public
    module MigrationDsl
      # Creates a CMS attribute.
      #
      # @example Create "test" Attribute
      #
      #   create_attribute(name: 'test', type: 'string')
      #
      # @param attributes [Hash] The attributes and their values of the new
      #   CMS attribute.
      #
      # @return nothing
      # @deprecated Please use local attributes. Create attributes using {#create_obj_class} or
      #   {#update_obj_class}.
      # @api public
      def create_attribute(attributes = {})
        warn_deprecated __callee__, 'create_obj_class', 'update_obj_class'
        endpoint = "revisions/#{Workspace.current.revision_id}/attributes"

        CmsRestApi.post(endpoint, attribute: attributes)
      end

      # Adds an attribute to an object class.
      #
      # @example Add "test" attribute to object class "Foo.
      #
      #   add_attribute_to('Foo', { name: 'test', type: 'string' })
      #
      # @param obj_class_name [String] The class name of the object class.
      # @param params [Hash] The definition of the new attribute.
      #
      # @return nothing
      def add_attribute_to(obj_class_name, params)
        attributes = get_obj_class(obj_class_name)['attributes']
        attributes << params

        update_obj_class(obj_class_name, attributes: attributes)
      end

      # Deletes an attribute from an object class.
      #
      # @example Delete "test" attribute from object class "Foo.
      #
      #   delete_attribute_from('Foo', 'test')
      #
      # @param obj_class_name [String] The class name of the object class.
      # @param attribute_name [String] The name of the attribute that should be
      #   deleted.
      #
      # @return nothing
      def delete_attribute_from(obj_class_name, attribute_name)
        attributes = get_obj_class(obj_class_name)['attributes']
        attributes = attributes.delete_if do |attribute|
          # handle global and local attributes
          name = attribute.is_a?(String) ? attribute : attribute['name']

          name == attribute_name.to_s
        end

        update_obj_class(obj_class_name, attributes: attributes)
      end

      # Updates an attribute for an object class. Turns local into global
      # attribute if found.
      #
      # @example Update "test" attribute for object class "Foo.
      #
      #   update_attribute_for('Foo', 'test', { title: 'New Title' })
      #
      # @param obj_class_name [String] The class name of the object class.
      # @param attribute_name [String] The name of the attribute that should be
      #   updated.
      # @param params [Hash] Hash of updated attributes.
      #
      # @return nothing
      def update_attribute_for(obj_class_name, attribute_name, params)
        attribute_name = attribute_name.to_s
        attributes = get_obj_class(obj_class_name)['attributes']
        found = false

        attributes.each_with_index do |attribute, index|
          name = attribute.is_a?(String) ? attribute : attribute['name']

          if name == attribute_name
            if attribute.is_a?(String)
              attribute = get_attribute(attribute)
            end

            attributes[index] = attribute.merge(params.stringify_keys)
            update_obj_class(obj_class_name, attributes: attributes)

            found = true

            break
          end
        end

        unless found
          raise ArgumentError.new("Object class '#{obj_class_name}' does not have attribute '#{attribute_name}'.")
        end
      end

      # Creates a CMS object.
      #
      # @example Create "/test" Object
      #
      #   create_obj(_path: '/test', _obj_class: 'Test')
      #
      # @param attributes [Hash] The attributes and their values of the new
      #   CMS object.
      #
      # @return nothing
      # @api public
      def create_obj(attributes = {})
        endpoint = "revisions/#{Workspace.current.revision_id}/objs"

        CmsRestApi.post(endpoint, obj: attributes)
      end

      # Creates a CMS object class.
      #
      # @example Create "Test" Object Class
      #
      #   create_obj_class(name: 'Test', type: 'publication')
      #
      # @param attributes [Hash] The attributes and their values of the new
      #   CMS object class.
      #
      # @return nothing
      # @api public
      def create_obj_class(attributes = {})
        endpoint = "revisions/#{Workspace.current.revision_id}/obj_classes"

        CmsRestApi.post(endpoint, obj_class: attributes)
      end

      # Deletes a CMS attribute.
      #
      # @example Delete "test" Attribute
      #
      #   delete_attribute('test')
      #
      # @param id [String] The ID of the CMS attribute.
      #
      # @return nothing
      # @deprecated Please use local attributes. Delete attributes using {#update_obj_class}.
      # @api public
      def delete_attribute(id)
        warn_deprecated __callee__, 'update_obj_class'
        endpoint = "revisions/#{Workspace.current.revision_id}/attributes/#{id}"

        CmsRestApi.delete(endpoint)
      end

      # Deletes a CMS object with the given id.
      #
      # @example Deletes "a1b2c3" Object
      #
      #   delete_obj('a1b2c3')
      #
      # @param id [String] The ID of the CMS object.
      #
      # @return nothing
      # @api public
      def delete_obj(id)
        endpoint = "revisions/#{Workspace.current.revision_id}/objs/#{id}"

        CmsRestApi.delete(endpoint)
      end

      # Fetches all attribute attributes and their values.
      #
      # @example Get all attributes for the attribute "test"
      #
      #   get_attribute('test')
      #
      # @param id [String] The ID of the attribute.
      #
      # @return [Hash] a hash with attributes and their values.
      # @deprecated Please use local attributes. Get attributes using {#get_obj_class}.
      # @api public
      def get_attribute(id)
        warn_deprecated __callee__, 'get_obj_class'
        endpoint = "revisions/#{Workspace.current.revision_id}/attributes/#{id}"

        CmsRestApi.get(endpoint)
      end

      # Fetches all object attributes and their values.
      #
      # @example Get all attributes for the obj with id "abc123"
      #
      #   get_obj('abc123')
      #
      # @param id [String] The ID of the CMS object.
      #
      # @return [Hash] a hash with attributes and their values.
      # @api public
      def get_obj(id)
        endpoint = "revisions/#{Workspace.current.revision_id}/objs/#{id}"

        CmsRestApi.get(endpoint)
      end

      # Fetches all object class attributes and their values.
      #
      # @example Get all attributes for the object class "Test"
      #
      #   get_obj_class('Test')
      #
      # @param id [String] The ID of the object class.
      #
      # @return [Hash] a hash with attributes and their values.
      # @api public
      def get_obj_class(id)
        endpoint = "revisions/#{Workspace.current.revision_id}/obj_classes/#{id}"

        CmsRestApi.get(endpoint)
      end

      # Updates a CMS attribute.
      #
      # @example Update the title of the "test" Attribute
      #
      #   update_attribute(title: 'Test Title')
      #
      # @param id [String] The ID of the attribute.
      # @param attributes [Hash] The updated attributes and their values.
      #
      # @return nothing
      # @deprecated Please use local attributes. Update attributes using {#update_obj_class}.
      # @api public
      def update_attribute(id, attributes = {})
        warn_deprecated __callee__, 'update_obj_class'
        endpoint = "revisions/#{Workspace.current.revision_id}/attributes/#{id}"

        CmsRestApi.put(endpoint, attribute: attributes)
      end

      # Updates a CMS object.
      #
      # @example Update the title of the "a1b2c3" Object
      #
      #   update_attribute('a1b2c3', title: 'Test Title')
      #
      # @param id [String] The ID of the CMS object.
      # @param attributes [Hash] The updated attributes and their values.
      #
      # @return nothing
      # @api public
      def update_obj(id, attributes = {})
        endpoint = "revisions/#{Workspace.current.revision_id}/objs/#{id}"

        CmsRestApi.put(endpoint, obj: attributes)
      end

      # Updates a CMS object class.
      #
      # @example Update the title of the "Test" Object Class
      #
      #   update_obj_class('Test', title: 'Test Title')
      #
      # @param id [String] The ID of the CMS object class.
      # @param attributes [Hash] The updated attributes and their values.
      #
      # @return nothing
      # @api public
      def update_obj_class(id, attributes = {})
        endpoint = "revisions/#{Workspace.current.revision_id}/obj_classes/#{id}"

        CmsRestApi.put(endpoint, obj_class: attributes)
      end

      # Uploads a file to the content store.
      #
      # @example Upload "image.png" and store it in an "Image" CMS object.
      #
      #   filename = 'image.png'
      #   file = File.new(filename)
      #   blob = upload_file(file)
      #   create_obj(_path: "/resources/images/#{filename}", _obj_class: 'Image', blob: blob)
      #
      # @param file [IO] The file IO object that gets uploaded.
      #
      # @return The blob of the uploaded file that can be stored on a CMS object.
      # @api public
      def upload_file(file)
        upload_permission = RailsConnector::CmsRestApi.get('blobs/upload_permission')

        fields = upload_permission['fields'].map { |name, value| [name, value] }
        fields << [:file, file]

        RestClient.post(upload_permission['url'], fields)

        upload_permission['blob']
      end

      private

      def warn_deprecated(method, *substitutes)
        warn "[DEPRECATION] '#{method}' is deprecated. Use '#{substitutes.join("' or '")}' instead."
      end
    end
  end
end