package log

import (
	"github.com/v2ray/v2ray-core/common/alloc"
	"github.com/v2ray/v2ray-core/common/serial"
)

// AccessStatus is the status of an access request from clients.
type AccessStatus string

const (
	AccessAccepted = AccessStatus("accepted")
	AccessRejected = AccessStatus("rejected")
)

var (
	accessLoggerInstance logWriter = &noOpLogWriter{}
)

type accessLog struct {
	From   serial.String
	To     serial.String
	Status AccessStatus
	Reason serial.String
}

func (this *accessLog) Release() {
	this.From = nil
	this.To = nil
	this.Reason = nil
}

func (this *accessLog) String() string {
	b := alloc.NewSmallBuffer().Clear()
	defer b.Release()

	return b.AppendString(this.From.String()).AppendString(" ").AppendString(string(this.Status)).AppendString(" ").AppendString(this.To.String()).AppendString(" ").AppendString(this.Reason.String()).String()
}

// InitAccessLogger initializes the access logger to write into the give file.
func InitAccessLogger(file string) error {
	logger, err := newFileLogWriter(file)
	if err != nil {
		Error("Failed to create access logger on file (", file, "): ", file, err)
		return err
	}
	accessLoggerInstance = logger
	return nil
}

// Access writes an access log.
func Access(from, to serial.String, status AccessStatus, reason serial.String) {
	accessLoggerInstance.Log(&accessLog{
		From:   from,
		To:     to,
		Status: status,
		Reason: reason,
	})
}