package main

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

	_ "github.com/mattn/go-sqlite3"
	rabbitmq "github.com/rabbitmq/amqp091-go"
	"src.opensuse.org/autogits/common"
	"src.opensuse.org/autogits/common/gitea-generated/models"
)

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

var obsNotifications map[string]*BuildNotification // Project/Package/Repositry/Arch as key
var notificationMutex sync.RWMutex
var notificationChannels map[string][]chan *BuildNotification

func getProjectBuildStatus(project string) []*BuildNotification {
	notificationMutex.RLock()
	defer notificationMutex.RUnlock()

	data := make([]*BuildNotification, 0, 4)
	for _, val := range obsNotifications {
		if val.Package == project {
			data = append(data, val)
		}
	}

	return data
}

func addProjectWatcher(meta *common.ProjectMeta, pr *models.PullReview) {
}

func addObsNotificationToCache(notification *BuildNotification) {
	key := strings.Join(
		[]string{
			notification.Project,
			notification.Package,
			notification.Repository,
			notification.Arch,
		},
		"/",
	)

	notificationMutex.Lock()
	obsNotifications[key] = notification

	chns, ok := notificationChannels[notification.Project]
	notificationMutex.Unlock()
	if ok {
		for _, ch := range chns {
			ch <- notification
		}
	}
}

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)
	addObsNotificationToCache(notification)
}

func ProcessingObsMessages(host, username, password, queueName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Print("recovering... reconnecting...\n")
			time.Sleep(5 * time.Second)
			go ProcessingObsMessages(host, username, password, queueName)
		}
	}()

	if obsNotifications == nil {
		obsNotifications = make(map[string]*BuildNotification)
//		notificationChannels = make(map[string]chan *BuildNotification)
	}

	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")

	var q rabbitmq.Queue
	if len(queueName) == 0 {
		q, err = ch.QueueDeclare("", false, true, true, false, nil)
	} else {
		q, err = ch.QueueDeclarePassive(queueName, true, false, true, false, nil)
		if err != nil {
			log.Printf("queue not found .. trying to create it: %v\n", err)
			if ch.IsClosed() {
				ch, err = connection.Channel()
				failOnError(err, "Channel cannot be re-opened")
			}
			q, err = ch.QueueDeclare(queueName, true, false, true, false, nil)

			if err != nil {
				log.Printf("can't create persistent queue ... falling back to temporaty queue: %v\n", err)
				if ch.IsClosed() {
					ch, err = connection.Channel()
					failOnError(err, "Channel cannot be re-opened")
				}
				q, err = ch.QueueDeclare("", false, true, true, 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)

	for {
		msg, ok := <-msgs
		if !ok {
			log.Printf("channel/connection closed?\n")

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

		processObsMessage(&msg)
	}
}