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

// +build !test

package api

import (
	"fmt"
	"time"

	"github.com/mainflux/mainflux/coap"
	log "github.com/mainflux/mainflux/logger"
	"github.com/mainflux/mainflux/messaging"
)

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

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

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

func (lm *loggingMiddleware) Publish(msg messaging.Message) (err error) {
	defer func(begin time.Time) {
		destChannel := msg.Channel
		if msg.Subtopic != "" {
			destChannel = fmt.Sprintf("%s.%s", destChannel, msg.Subtopic)
		}
		message := fmt.Sprintf("Method publish to channel %s took %s to complete", destChannel, 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.Publish(msg)
}

func (lm *loggingMiddleware) Subscribe(chanID, subtopic, obsID string, o *coap.Observer) (err error) {
	defer func(begin time.Time) {
		destChannel := chanID
		if subtopic != "" {
			destChannel = fmt.Sprintf("%s.%s", destChannel, subtopic)
		}
		message := fmt.Sprintf("Method subscribe to channel %s for client %s took %s to complete", destChannel, obsID, 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.Subscribe(chanID, subtopic, obsID, o)
}

func (lm *loggingMiddleware) Unsubscribe(obsID string) {
	defer func(begin time.Time) {
		message := fmt.Sprintf("Method unsubscribe for the client %s took %s to complete without errors.", obsID, time.Since(begin))
		lm.logger.Info(fmt.Sprintf(message))
	}(time.Now())

	lm.svc.Unsubscribe(obsID)
}
