package main

import (
	"fmt"
	"math/rand"
	"os"
	"os/user"
	"time"

	"github.com/lbryio/lbry.go/extras/util"
	"github.com/lbryio/ytsync/sdk"
	log "github.com/sirupsen/logrus"
	"github.com/spf13/cobra"

	"github.com/lbryio/ytsync/manager"
	logUtils "github.com/lbryio/ytsync/util"
)

var Version string

const defaultMaxTries = 3

var (
	stopOnError             bool
	maxTries                int
	takeOverExistingChannel bool
	refill                  int
	limit                   int
	skipSpaceCheck          bool
	syncUpdate              bool
	singleRun               bool
	syncStatus              string
	channelID               string
	syncFrom                int64
	syncUntil               int64
	concurrentJobs          int
	videosLimit             int
	maxVideoSize            int
	maxVideoLength          float64
	removeDBUnpublished     bool
	upgradeMetadata         bool
)

func main() {
	rand.Seed(time.Now().UnixNano())
	log.SetLevel(log.DebugLevel)

	cmd := &cobra.Command{
		Use:   "ytsync",
		Short: "Publish youtube channels into LBRY network automatically.",
		Run:   ytSync,
		Args:  cobra.RangeArgs(0, 0),
	}

	cmd.Flags().BoolVar(&stopOnError, "stop-on-error", false, "If a publish fails, stop all publishing and exit")
	cmd.Flags().IntVar(&maxTries, "max-tries", defaultMaxTries, "Number of times to try a publish that fails")
	cmd.Flags().BoolVar(&takeOverExistingChannel, "takeover-existing-channel", false, "If channel exists and we don't own it, take over the channel")
	cmd.Flags().IntVar(&limit, "limit", 0, "limit the amount of channels to sync")
	cmd.Flags().BoolVar(&skipSpaceCheck, "skip-space-check", false, "Do not perform free space check on startup")
	cmd.Flags().BoolVar(&syncUpdate, "update", false, "Update previously synced channels instead of syncing new ones")
	cmd.Flags().BoolVar(&singleRun, "run-once", false, "Whether the process should be stopped after one cycle or not")
	cmd.Flags().BoolVar(&removeDBUnpublished, "remove-db-unpublished", false, "Remove videos from the database that are marked as published but aren't really published")
	cmd.Flags().BoolVar(&upgradeMetadata, "upgrade-metadata", false, "Upgrade videos if they're on the old metadata version")
	cmd.Flags().StringVar(&syncStatus, "status", "", "Specify which queue to pull from. Overrides --update")
	cmd.Flags().StringVar(&channelID, "channelID", "", "If specified, only this channel will be synced.")
	cmd.Flags().Int64Var(&syncFrom, "after", time.Unix(0, 0).Unix(), "Specify from when to pull jobs [Unix time](Default: 0)")
	cmd.Flags().Int64Var(&syncUntil, "before", time.Now().AddDate(1, 0, 0).Unix(), "Specify until when to pull jobs [Unix time](Default: current Unix time)")
	cmd.Flags().IntVar(&concurrentJobs, "concurrent-jobs", 1, "how many jobs to process concurrently")
	cmd.Flags().IntVar(&videosLimit, "videos-limit", 1000, "how many videos to process per channel")
	cmd.Flags().IntVar(&maxVideoSize, "max-size", 2048, "Maximum video size to process (in MB)")
	cmd.Flags().Float64Var(&maxVideoLength, "max-length", 2.0, "Maximum video length to process (in hours)")

	if err := cmd.Execute(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func ytSync(cmd *cobra.Command, args []string) {
	var hostname string
	slackToken := os.Getenv("SLACK_TOKEN")
	if slackToken == "" {
		log.Error("A slack token was not present in env vars! Slack messages disabled!")
	} else {
		var err error
		hostname, err = os.Hostname()
		if err != nil {
			log.Error("could not detect system hostname")
			hostname = "ytsync-unknown"
		}
		util.InitSlack(os.Getenv("SLACK_TOKEN"), os.Getenv("SLACK_CHANNEL"), hostname)
	}

	if syncStatus != "" && !util.InSlice(syncStatus, manager.SyncStatuses) {
		log.Errorf("status must be one of the following: %v\n", manager.SyncStatuses)
		return
	}

	if stopOnError && maxTries != defaultMaxTries {
		log.Errorln("--stop-on-error and --max-tries are mutually exclusive")
		return
	}
	if maxTries < 1 {
		log.Errorln("setting --max-tries less than 1 doesn't make sense")
		return
	}

	if limit < 0 {
		log.Errorln("setting --limit less than 0 (unlimited) doesn't make sense")
		return
	}

	apiURL := os.Getenv("LBRY_WEB_API")
	apiToken := os.Getenv("LBRY_API_TOKEN")
	youtubeAPIKey := os.Getenv("YOUTUBE_API_KEY")
	blobsDir := os.Getenv("BLOBS_DIRECTORY")
	lbrycrdString := os.Getenv("LBRYCRD_STRING")
	awsS3ID := os.Getenv("AWS_S3_ID")
	awsS3Secret := os.Getenv("AWS_S3_SECRET")
	awsS3Region := os.Getenv("AWS_S3_REGION")
	awsS3Bucket := os.Getenv("AWS_S3_BUCKET")
	if apiURL == "" {
		log.Errorln("An API URL was not defined. Please set the environment variable LBRY_WEB_API")
		return
	}
	if apiToken == "" {
		log.Errorln("An API Token was not defined. Please set the environment variable LBRY_API_TOKEN")
		return
	}
	if youtubeAPIKey == "" {
		log.Errorln("A Youtube API key was not defined. Please set the environment variable YOUTUBE_API_KEY")
		return
	}
	if awsS3ID == "" {
		log.Errorln("AWS S3 ID credentials were not defined. Please set the environment variable AWS_S3_ID")
		return
	}
	if awsS3Secret == "" {
		log.Errorln("AWS S3 Secret credentials were not defined. Please set the environment variable AWS_S3_SECRET")
		return
	}
	if awsS3Region == "" {
		log.Errorln("AWS S3 Region was not defined. Please set the environment variable AWS_S3_REGION")
		return
	}
	if awsS3Bucket == "" {
		log.Errorln("AWS S3 Bucket was not defined. Please set the environment variable AWS_S3_BUCKET")
		return
	}
	if lbrycrdString == "" {
		log.Infoln("Using default (local) lbrycrd instance. Set LBRYCRD_STRING if you want to use something else")
	}
	if blobsDir == "" {
		usr, err := user.Current()
		if err != nil {
			log.Errorln(err.Error())
			return
		}
		blobsDir = usr.HomeDir + "/.lbrynet/blobfiles/"
	}

	syncProperties := &sdk.SyncProperties{
		SyncFrom:         syncFrom,
		SyncUntil:        syncUntil,
		YoutubeChannelID: channelID,
	}
	apiConfig := &sdk.APIConfig{
		YoutubeAPIKey: youtubeAPIKey,
		ApiURL:        apiURL,
		ApiToken:      apiToken,
		HostName:      hostname,
	}
	sm := manager.NewSyncManager(
		stopOnError,
		maxTries,
		takeOverExistingChannel,
		refill,
		limit,
		skipSpaceCheck,
		syncUpdate,
		concurrentJobs,
		concurrentJobs,
		blobsDir,
		videosLimit,
		maxVideoSize,
		lbrycrdString,
		awsS3ID,
		awsS3Secret,
		awsS3Region,
		awsS3Bucket,
		syncStatus,
		singleRun,
		syncProperties,
		apiConfig,
		maxVideoLength,
		removeDBUnpublished,
		upgradeMetadata,
	)
	err := sm.Start()
	if err != nil {
		logUtils.SendErrorToSlack(err.Error())
	}
	logUtils.SendInfoToSlack("Syncing process terminated!")
}