package kafka

type FetchResponseBlock struct {
	err                 KError
	highWaterMarkOffset int64
	msgSet              messageSet
}

func (pr *FetchResponseBlock) decode(pd packetDecoder) (err error) {
	pr.err, err = pd.getError()
	if err != nil {
		return err
	}

	pr.highWaterMarkOffset, err = pd.getInt64()
	if err != nil {
		return err
	}

	msgSetSize, err := pd.getInt32()
	if err != nil {
		return err
	}

	msgSetDecoder, err := pd.getSubset(int(msgSetSize))
	if err != nil {
		return err
	}
	err = (&pr.msgSet).decode(msgSetDecoder)

	return err
}

type FetchResponse struct {
	Blocks map[*string]map[int32]*FetchResponseBlock
}

func (fr *FetchResponse) decode(pd packetDecoder) (err error) {
	numTopics, err := pd.getArrayCount()
	if err != nil {
		return err
	}

	fr.Blocks = make(map[*string]map[int32]*FetchResponseBlock, numTopics)
	for i := 0; i < numTopics; i++ {
		name, err := pd.getString()
		if err != nil {
			return err
		}

		numBlocks, err := pd.getArrayCount()
		if err != nil {
			return err
		}

		fr.Blocks[name] = make(map[int32]*FetchResponseBlock, numBlocks)

		for j := 0; j < numBlocks; j++ {
			id, err := pd.getInt32()
			if err != nil {
				return err
			}

			block := new(FetchResponseBlock)
			err = block.decode(pd)
			if err != nil {
				return err
			}
			fr.Blocks[name][id] = block
		}
	}

	return nil
}