//
// Copyright (c) 2018
// Mainflux
//
// SPDX-License-Identifier: Apache-2.0
//

package api

import (
	"fmt"
	"time"

	log "github.com/mainflux/mainflux/logger"
	"github.com/mainflux/mainflux/users"
)

var _ users.Service = (*loggingMiddleware)(nil)

type loggingMiddleware struct {
	logger log.Logger
	svc    users.Service
}

// LoggingMiddleware adds logging facilities to the core service.
func LoggingMiddleware(svc users.Service, logger log.Logger) users.Service {
	return &loggingMiddleware{logger, svc}
}

func (lm *loggingMiddleware) Register(user users.User) (err error) {
	defer func(begin time.Time) {
		message := fmt.Sprintf("Method register for user %s took %s to complete", user.Email, time.Since(begin))
		if err != nil {
			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
			return
		}
		lm.logger.Info(fmt.Sprintf("%s without errors.", message))

	}(time.Now())

	return lm.svc.Register(user)
}

func (lm *loggingMiddleware) Login(user users.User) (token string, err error) {
	defer func(begin time.Time) {
		message := fmt.Sprintf("Method login for user %s took %s to complete", user.Email, time.Since(begin))
		if err != nil {
			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
			return
		}
		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
	}(time.Now())

	return lm.svc.Login(user)
}

func (lm *loggingMiddleware) Identify(key string) (id string, err error) {
	defer func(begin time.Time) {
		message := fmt.Sprintf("Method identity for client %s took %s to complete", id, time.Since(begin))
		if err != nil {
			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
			return
		}
		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
	}(time.Now())

	return lm.svc.Identify(key)
}