package odbcmql

import (
	"context"
	"fmt"
	"strings"
	"sync"
	"time"

	odb "git.wecise.com/wecise/odb-go/odb"
)

var subscriptionsmutex sync.Mutex
var subscriptions = map[string]odb.Subscription{}
var receivedcount = map[string]int{}

func subscribe(topics ...string) {
	subscriptionsmutex.Lock()
	defer subscriptionsmutex.Unlock()
	for _, topic := range topics {
		topic = strings.TrimSpace(topic)
		if subscriptions[topic] == nil {
			sub := ODBC.Subscribe(context.Background(), topic)
			go func(sub odb.Subscription) {
				st := time.Now()
				for m := range sub.Channel() {
					eds := m.EventData().String()
					subscriptionsmutex.Lock()
					receivedcount[eds]++
					n := receivedcount[eds]
					subscriptionsmutex.Unlock()
					logger.Info(fmt.Sprint("received ", topic, " notify message: ", eds, " [", n, "] in ", time.Since(st)))
					oem, err := m.EventMessage()
					if err != nil {
						logger.Error("event message error: " + err.Error())
					} else {
						logger.Infof("event message value: %v", oem)
					}
				}
			}(sub)
			subscriptions[topic] = sub
			logger.Info("subscribe topic " + topic + " done")
		}
	}
}

func unsubscribe(topics ...string) {
	subscriptionsmutex.Lock()
	defer subscriptionsmutex.Unlock()
	for _, topic := range topics {
		topic = strings.TrimSpace(topic)
		if sub := subscriptions[topic]; sub != nil {
			if err := sub.Unsubscribe(context.Background()); err != nil {
				logger.Error(err)
			} else {
				delete(subscriptions, topic)
				logger.Info("unsubscribe topic " + topic + " done")
			}
		}
	}
}