package y3

import (
	"fmt"

	"github.com/yomorun/y3-codec-golang/pkg/encoding"
)

// 描述最小的Packet大小为3个字节
const primitivePacketBufferMinimalLength = 3

// PrimitivePacket 定义了值类型的节点，是Codec中的最小单位，以`TLV结构`进行数据描述
type PrimitivePacket basePacket

// SeqID returns the key of primitive packet
func (p *PrimitivePacket) SeqID() byte {
	return p.tag.SeqID()
}

// String prints debug info
func (p *PrimitivePacket) String() string {
	return fmt.Sprintf("Tag=%#x, Length=%v, RawDataLength=%v, Raw=[%#x]", p.tag, p.length, len(p.valBuf), p.valBuf)
}

// ToInt32 parse raw as int32 value
func (p *PrimitivePacket) ToInt32() (int32, error) {
	var val int32
	codec := encoding.VarCodec{}
	err := codec.DecodePVarInt32(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToUInt32 parse raw as int32 value
func (p *PrimitivePacket) ToUInt32() (uint32, error) {
	var val uint32
	codec := encoding.VarCodec{}
	err := codec.DecodePVarUInt32(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToInt64 parse raw as int32 value
func (p *PrimitivePacket) ToInt64() (int64, error) {
	var val int64
	codec := encoding.VarCodec{}
	err := codec.DecodePVarInt64(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToUInt64 parse raw as uint64 value
func (p *PrimitivePacket) ToUInt64() (uint64, error) {
	var val uint64
	codec := encoding.VarCodec{}
	err := codec.DecodePVarUInt64(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToFloat32 parse raw as float32 value
func (p *PrimitivePacket) ToFloat32() (float32, error) {
	var val float32
	codec := encoding.VarCodec{Size: len(p.valBuf)}
	err := codec.DecodeVarFloat32(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToFloat64 parse raw as float64 value
func (p *PrimitivePacket) ToFloat64() (float64, error) {
	var val float64
	codec := encoding.VarCodec{Size: len(p.valBuf)}
	err := codec.DecodeVarFloat64(p.valBuf, &val)
	if err != nil {
		return 0, err
	}
	return val, nil
}

// ToBool parse raw as bool value
func (p *PrimitivePacket) ToBool() (bool, error) {
	var val bool
	codec := encoding.VarCodec{Size: len(p.valBuf)}
	err := codec.DecodePVarBool(p.valBuf, &val)
	if err != nil {
		return false, err
	}
	return val, nil
}

// ToUTF8String parse raw data as string value
func (p *PrimitivePacket) ToUTF8String() (string, error) {
	return string(p.valBuf), nil
}

// ToBytes returns raw buffer data
func (p *PrimitivePacket) ToBytes() []byte {
	return p.valBuf
}