package main

import (
	"crypto/tls"
	"encoding/json"
	"log"
	"strings"
	"time"

	rabbitmq "github.com/rabbitmq/amqp091-go"
)

type BuildNotification struct {
	BuildSuccess                                                          bool
	Project, Package, Repository, Arch, Release, Rev, Buildtype, Workerid string
	Starttime, Endtime, Readytime                                         uint64
}

func failOnError(err error, msg string) {
	if err != nil {
		log.Panicf("%s: %s", err, msg)
	}
}

func processObsMessage(msg *rabbitmq.Delivery) {
	key := strings.SplitN(msg.RoutingKey, ".", 4)
	if len(key) != 4 || len(key[3]) < 7 || key[3][:6] != "build_" {
		return
	}

	buildSuccess := false
	switch key[3][6:] {
	case "success", "unchanged":
		buildSuccess = true
	case "fail":
		buildSuccess = false
	default:
		log.Printf("unknown build_ logging message: %s\n", msg.RoutingKey)
		return
	}

	notification := &BuildNotification{
		BuildSuccess: buildSuccess,
	}
	err := json.Unmarshal(msg.Body, notification)
	if err != nil {
		log.Printf("Cannot unmarshall json object: %s\n", msg.Body)
		return
	}

	log.Printf("%v\n", notification)

}

func startProcessingObsMessages(host, username, password string) {
	auth := ""
	if len(username) > 0 && len(password) > 0 {
		auth = username + ":" + password + "@"
	}
	connection, err := rabbitmq.DialTLS("amqps://"+auth+host, &tls.Config{
		ServerName: host,
	})
	failOnError(err, "Cannot connect to rabbit.opensuse.org")
	defer connection.Close()

	ch, err := connection.Channel()
	failOnError(err, "Cannot create a channel")
	defer ch.Close()

	err = ch.ExchangeDeclarePassive("pubsub", "topic", true, false, false, false, nil)
	failOnError(err, "Cannot find pubsub exchange")

	q, err := ch.QueueDeclare("", false, true, false, false, nil)
	failOnError(err, "Cannot declare queue")
	log.Printf("queue: %s:%d", q.Name, q.Consumers)

	err = ch.QueueBind(q.Name, "*.obs.package.*", "pubsub", false, nil)
	failOnError(err, "Cannot bind queue to exchange")

	msgs, err := ch.Consume(q.Name, "", true, true, false, false, nil)
	failOnError(err, "Cannot start consumer")
	log.Printf("queue: %s:%d", q.Name, q.Consumers)

	// TODO: add recovery for NotifyClose and related
	for {
		msg, ok := <-msgs
		if !ok {
			log.Printf("channel closed?\n")

			if connection.IsClosed() {
				// reconnect
				log.Printf("reconnecting...")
				time.Sleep(5 * time.Second)
				go startProcessingObsMessages(host, username, password)
			}
			return
		}

		processObsMessage(&msg)
	}
}