package mq_coder

import (
	"errors"
	"io"
)

var (
	errBuildIncomplete = errors.New("coder.Encoder: invalid structure of packet")
	errInvalidAdding   = errors.New("coder.Encoder: can not add this Packet after StreamPacket has been add")
	errNonStreamPacket = errors.New("coder.Packet: this packet is not in node mode")
	errWriteFromReader = errors.New("coder.streamV: write from reader error")
	errNotNodeMode     = errors.New("coder.Encoder: packet should be in node mode can be add other packets as child")
	errNilReader       = errors.New("coder.Decoder: nil source reader")
)

// Packet 编解码器包
type Packet interface {
	// SeqId 返回此数据包的序列Id.
	SeqId() int
	// Size 返回整个数据包的大小
	Size() int
	// VSize 返回V的大小.
	VSize() int
	// Bytes 此数据包的全部字节.
	Bytes() []byte
	// Reader 返回 io.Reader 字节.
	Reader() io.Reader
	// VReader 返回 io.Reader 的 流字节.
	VReader() io.Reader
	// IsStreamMode 是否流模式
	IsStreamMode() bool
	// IsNodeMode 是否节点模式
	IsNodeMode() bool

	// BytesV 返回流字节
	BytesV() []byte
	// Utf8StringV 返回流的utf8字符串值
	Utf8StringV() string
	// Int32V 返回流的int32值
	Int32V() (val int32, err error)
	// UInt32V 返回流的uint32值
	UInt32V() (val uint32, err error)
	// Int64V 返回流的int64值
	Int64V() (val int64, err error)
	// UInt64V 返回流的uint64值
	UInt64V() (val uint64, err error)
	// Float32V 返回流的float32值
	Float32V() (val float32, err error)
	// Float64V 返回流的float64值
	Float64V() (val float64, err error)
	// BoolV 返回流的bool值
	BoolV() (val bool, err error)
}