// -
//   ========================LICENSE_START=================================
//   O-RAN-SC
//   %%
//   Copyright (C) 2021: Nordix Foundation
//   %%
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
//   ========================LICENSE_END===================================
//

package main

import (
	"fmt"
	"net/http"
	"sync"
	"time"

	"github.com/hashicorp/go-retryablehttp"
	log "github.com/sirupsen/logrus"
	"oransc.org/nonrtric/dmaapmediatorproducer/internal/config"
	"oransc.org/nonrtric/dmaapmediatorproducer/internal/jobs"
	"oransc.org/nonrtric/dmaapmediatorproducer/internal/restclient"
	"oransc.org/nonrtric/dmaapmediatorproducer/internal/server"
)

const timeoutDistributionClient = time.Second * 5
const retryWaitMax = time.Minute
const retryMax = int(^uint(0) >> 1)

var configuration *config.Config
var retryClient restclient.HTTPClient
var jobHandler *jobs.JobHandlerImpl

func init() {
	configuration = config.New()
}

func main() {
	log.SetLevel(configuration.LogLevel)
	log.Debug("Initializing DMaaP Mediator Producer")
	if err := validateConfiguration(configuration); err != nil {
		log.Fatalf("Stopping producer due to error: %v", err)
	}
	callbackAddress := fmt.Sprintf("%v:%v", configuration.InfoProducerHost, configuration.InfoProducerPort)

	distributionClient := &http.Client{
		Timeout: timeoutDistributionClient,
	}

	rawRetryClient := retryablehttp.NewClient()
	rawRetryClient.RetryWaitMax = retryWaitMax
	rawRetryClient.RetryMax = retryMax
	retryClient = rawRetryClient.StandardClient()

	jobHandler = jobs.NewJobHandlerImpl("configs/type_config.json", retryClient, distributionClient)
	if err := registerTypesAndProducer(jobHandler, configuration.InfoCoordinatorAddress, callbackAddress); err != nil {
		log.Fatalf("Stopping producer due to: %v", err)
	}

	log.Debug("Starting DMaaP Mediator Producer")
	wg := new(sync.WaitGroup)

	// add two goroutines to `wg` WaitGroup, one for each running go routine
	wg.Add(2)

	log.Debugf("Starting callback server at port %v", configuration.InfoProducerPort)
	go func() {
		r := server.NewRouter(jobHandler)
		log.Warn(http.ListenAndServe(fmt.Sprintf(":%v", configuration.InfoProducerPort), r))
		wg.Done()
	}()

	go func() {
		jobHandler.RunJobs(fmt.Sprintf("%v:%v", configuration.MRHost, configuration.MRPort))
		wg.Done()
	}()

	// wait until WaitGroup is done
	wg.Wait()
	log.Debug("Stopping DMaaP Mediator Producer")
}

func validateConfiguration(configuration *config.Config) error {
	if configuration.InfoProducerHost == "" {
		return fmt.Errorf("missing INFO_PRODUCER_HOST")
	}
	return nil
}

func registerTypesAndProducer(jobHandler jobs.JobTypeHandler, infoCoordinatorAddress string, callbackAddress string) error {
	registrator := config.NewRegistratorImpl(infoCoordinatorAddress, retryClient)
	if types, err := jobHandler.GetTypes(); err == nil {
		if regErr := registrator.RegisterTypes(types); regErr != nil {
			return fmt.Errorf("unable to register all types due to: %v", regErr)
		}
	} else {
		return fmt.Errorf("unable to get types to register due to: %v", err)
	}
	producer := config.ProducerRegistrationInfo{
		InfoProducerSupervisionCallbackUrl: callbackAddress + server.StatusPath,
		SupportedInfoTypes:                 jobHandler.GetSupportedTypes(),
		InfoJobCallbackUrl:                 callbackAddress + server.AddJobPath,
	}
	if err := registrator.RegisterProducer("DMaaP_Mediator_Producer", &producer); err != nil {
		return fmt.Errorf("unable to register producer due to: %v", err)
	}
	return nil
}