package sarama

// ReceiveTime is a special value for the timestamp field of Offset Commit Requests which
// tells the broker to set the timestamp to the time at which the request was received.
const ReceiveTime int64 = -1

type offsetCommitRequestBlock struct {
	offset    int64
	timestamp int64
	metadata  string
}

func (r *offsetCommitRequestBlock) encode(pe packetEncoder) error {
	pe.putInt64(r.offset)
	pe.putInt64(r.timestamp)
	return pe.putString(r.metadata)
}

type OffsetCommitRequest struct {
	ConsumerGroup string
	blocks        map[string]map[int32]*offsetCommitRequestBlock
}

func (r *OffsetCommitRequest) encode(pe packetEncoder) error {
	err := pe.putString(r.ConsumerGroup)
	if err != nil {
		return err
	}
	err = pe.putArrayLength(len(r.blocks))
	if err != nil {
		return err
	}
	for topic, partitions := range r.blocks {
		err = pe.putString(topic)
		if err != nil {
			return err
		}
		err = pe.putArrayLength(len(partitions))
		if err != nil {
			return err
		}
		for partition, block := range partitions {
			pe.putInt32(partition)
			err = block.encode(pe)
			if err != nil {
				return err
			}
		}
	}
	return nil
}

func (r *OffsetCommitRequest) key() int16 {
	return 8
}

func (r *OffsetCommitRequest) version() int16 {
	return 0
}

func (r *OffsetCommitRequest) AddBlock(topic string, partitionID int32, offset int64, timestamp int64, metadata string) {
	if r.blocks == nil {
		r.blocks = make(map[string]map[int32]*offsetCommitRequestBlock)
	}

	if r.blocks[topic] == nil {
		r.blocks[topic] = make(map[int32]*offsetCommitRequestBlock)
	}

	r.blocks[topic][partitionID] = &offsetCommitRequestBlock{offset, timestamp, metadata}
}