qbtrade/pkg/types/positionSide.go

package types

import (
	"encoding/json"
	"strings"

	"github.com/pkg/errors"

	"git.qtrade.icu/lychiyu/qbtrade/pkg/style"
)

// PositionSideType define side type of order
type PositionSideType string

const (
	PositionSideTypeShort = PositionSideType("SHORT")
	PositionSideTypeLong  = PositionSideType("LONG")
)

var ErrInvalidPositionSideType = errors.New("invalid position side type")

func StrToPositionSideType(s string) (side PositionSideType, err error) {
	switch strings.ToLower(s) {
	case "LONG":
		side = PositionSideTypeLong

	case "SHORT":
		side = PositionSideTypeShort

	default:
		err = ErrInvalidSideType
		return side, err

	}

	return side, err
}

func (side *PositionSideType) UnmarshalJSON(data []byte) error {
	var s string
	if err := json.Unmarshal(data, &s); err != nil {
		return err
	}

	ss, err := StrToPositionSideType(s)
	if err != nil {
		return err
	}

	*side = ss
	return nil
}

func (side PositionSideType) Reverse() PositionSideType {
	switch side {
	case PositionSideTypeShort:
		return PositionSideTypeShort

	case PositionSideTypeLong:
		return PositionSideTypeLong
	}

	return side
}

func (side PositionSideType) String() string {
	return string(side)
}

func (side PositionSideType) Color() string {
	if side == PositionSideTypeShort {
		return style.GreenColor
	}

	if side == PositionSideTypeLong {
		return style.RedColor
	}

	return style.GrayColor
}

func PositionSideToColorName(side PositionSideType) string {
	return side.Color()
}