package ipp

import (
	"bufio"
	"encoding/binary"

	log "github.com/sirupsen/logrus"
)

// Currently the collection data is just consumed and dropped from the bytestream
func consumeCollection(byteStream *bufio.Reader) {
	// RFC8010 Section 3.1.6
	var length uint16

	binary.Read(byteStream, binary.BigEndian, &length)
	collectionName := make([]byte, length)
	if length > 0 {
		binary.Read(byteStream, binary.BigEndian, collectionName)
	}
	log.Info("collection name " + string(collectionName))
	err := binary.Read(byteStream, binary.BigEndian, &length) //Always zero ??
	if err != nil {
		log.Fatal("error ", err.Error())
	}
	if length != 0 {
		log.Fatal("Should be zero")
	}
	// Member attributes
done:
	for {
		var t tag
		binary.Read(byteStream, binary.BigEndian, &t)
		log.Debug("Collection tag ", t)
		switch t {
		case endCollectionValueTag:
			binary.Read(byteStream, binary.BigEndian, &length)
			if length != 0 {
				log.Fatal("Should be zero")
			}
			binary.Read(byteStream, binary.BigEndian, &length)
			if length != 0 {
				log.Fatal("Should be zero")
			}
		case memberAttrNameValueTag:
			// RFC8010 Section 3.7.1
			binary.Read(byteStream, binary.BigEndian, &length) //Always zero ??
			if length != 0 {
				log.Fatal("Should be zero")
			}
			binary.Read(byteStream, binary.BigEndian, &length) // Value length
			memberName := make([]byte, length)
			binary.Read(byteStream, binary.BigEndian, memberName)
			log.Debugf("Member name: %v", string(memberName))
			var memberValueTag tag
			binary.Read(byteStream, binary.BigEndian, &memberValueTag)
			log.Debug("Member value tag: ", memberValueTag)
			binary.Read(byteStream, binary.BigEndian, &length) //Always zero ??
			if length != 0 {
				log.Fatal("Should be zero")
			}
			var memberValueLength uint16
			binary.Read(byteStream, binary.BigEndian, &memberValueLength)
			memberValue := make([]byte, memberValueLength)
			binary.Read(byteStream, binary.BigEndian, memberValue)
			log.Debugf("Member Value: % x", memberValue)
		default:
			//  Next tag is one that can not be handled in the collection
			// Put it back in the byte stream and return to main loop
			byteStream.UnreadByte()
			break done
		}
	}
	log.Debug("Collection done")
}