# Copyright, 2018, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require_relative 'frame'

module HTTP
	module Protocol
		module HTTP2
			NO_ERROR = 0
			PROTOCOL_ERROR = 1
			INTERNAL_ERROR = 2
			FLOW_CONTROL_ERROR = 3
			TIMEOUT = 4
			STREAM_CLOSED = 5
			FRAME_SIZE_ERROR = 6
			REFUSED_STREAM = 7
			CANCEL = 8
			COMPRESSION_ERROR = 9
			CONNECT_ERROR = 10
			ENHANCE_YOUR_CALM = 11
			INADEQUATE_SECURITY = 12
			HTTP_1_1_REQUIRED = 13
			
			# The RST_STREAM frame allows for immediate termination of a stream. RST_STREAM is sent to request cancellation of a stream or to indicate that an error condition has occurred.
			#
			# +---------------------------------------------------------------+
			# |                        Error Code (32)                        |
			# +---------------------------------------------------------------+
			#
			class ResetStreamFrame < Frame
				TYPE = 0x3
				FORMAT = "N".freeze
				
				def unpack
					@payload.unpack(FORMAT).first
				end
				
				def pack(error_code = NO_ERROR)
					@payload = [error_code].pack(FORMAT)
					@length = @payload.bytesize
				end
				
				def apply(connection)
					connection.receive_reset_stream(self)
				end
				
				def read_payload(io)
					super
					
					if @length != 4
						raise FrameSizeError, "Invalid frame length"
					end
				end
			end
		end
	end
end