zurg/internal/torrent/refresh.go

package torrent

import (
	"context"
	"fmt"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"github.com/debridmediamanager/zurg/internal/config"
	"github.com/debridmediamanager/zurg/pkg/realdebrid"
	"github.com/debridmediamanager/zurg/pkg/utils"
	mapset "github.com/deckarep/golang-set/v2"
	cmap "github.com/orcaman/concurrent-map/v2"
	"gopkg.in/vansante/go-ffprobe.v2"
)

func (t *TorrentManager) refreshTorrents(initialRun bool) {
	instances, _, err := t.rd.GetTorrents(false)
	if err != nil {
		t.log.Warnf("Cannot get torrents: %v", err)
		t.log.Info("Retrying in 5 seconds")
		time.Sleep(5 * time.Second)
		t.refreshTorrents(initialRun)
		return
	}

	var wg sync.WaitGroup
	var mergeChan = make(chan *Torrent, len(instances))

	torrents, _ := t.DirectoryMap.Get(INT_ALL)
	oldKeys := mapset.NewSet[string](torrents.Keys()...)

	freshIDs := mapset.NewSet[string]()
	freshAccessKeys := mapset.NewSet[string]()

	for i := range instances {
		freshIDs.Add(instances[i].ID)
		wg.Add(1)
		idx := i
		t.workerPool.Submit(func() {
			defer wg.Done()
			tInfo := t.getMoreInfo(instances[idx])
			if tInfo == nil {
				// just in case!
				mergeChan <- nil
				return
			}
			status := tInfo.Status
			if status != "downloading" && status != "downloaded" && status != "uploading" && status != "queued" && status != "compressing" && status != "waiting_files_selection" {
				t.deleteOnceDone(tInfo.ID, true)
			}
			if tInfo.Progress != 100 || len(tInfo.Links) == 0 {
				mergeChan <- nil
				return
			}
			torrent := t.convertToTorrent(tInfo)
			accessKey := t.GetKey(torrent)
			freshAccessKeys.Add(accessKey)

			var forMerging *Torrent
			mainTorrent, exists := torrents.Get(accessKey)
			if !exists {
				torrents.Set(accessKey, torrent)
				t.writeTorrentToFile(torrent)
				t.assignDirectory(torrent, !initialRun, true)
			} else if !mainTorrent.DownloadedIDs.ContainsOne(tInfo.ID) {
				forMerging = torrent
			}

			mergeChan <- forMerging
		})
	}

	wg.Wait()
	close(mergeChan)

	t.log.Infof("Compiling %d torrents", len(instances))

	for torrent := range mergeChan {
		if torrent == nil {
			continue
		}
		accessKey := t.GetKey(torrent)
		existing, ok := torrents.Get(accessKey)
		if !ok {
			t.log.Warnf("Cannot merge %s", accessKey)
			continue
		}
		mainTorrent := t.mergeTorrents(existing, torrent)
		torrents.Set(accessKey, mainTorrent)
		t.writeTorrentToFile(mainTorrent)
		t.assignDirectory(mainTorrent, !initialRun, true)
	}

	// new torrents
	t.workerPool.Submit(func() {
		if !t.hasFFprobe || !t.Config.ShouldAutoAnalyzeNewTorrents() {
			return
		}
		freshAccessKeys.Difference(oldKeys).Each(func(accessKey string) bool {
			torrent, _ := torrents.Get(accessKey)
			t.applyMediaInfoDetails(torrent)
			return false
		})
	})

	// removed torrents
	oldKeys.Difference(freshAccessKeys).Each(func(accessKey string) bool {
		t.Delete(accessKey, false)
		return false
	})

	t.log.Infof("Compiled into %d unique torrents", torrents.Count())

	t.workerPool.Submit(func() {
		t.OnceDoneBin.Clone().Each(func(entry string) bool {
			// check for: delete once done cases
			if !freshIDs.ContainsOne(entry) {
				t.OnceDoneBin.Remove(entry)
			}
			return false
		})
		t.persistBins()
	})

	// delete info files that are no longer present
	// it also runs binOnceDone (needed for cleanup every refresh)
	t.getInfoFiles().Each(func(path string) bool {
		path = filepath.Base(path)
		torrentID := strings.TrimSuffix(path, ".zurginfo")
		if !freshIDs.ContainsOne(torrentID) {
			t.deleteInfoFile(torrentID)
			return false
		}
		t.deleteOnceDone(torrentID, false)
		return false
	})

	// cleans up DownloadedIDs field of all torrents
	t.workerPool.Submit(func() {
		torrents.IterCb(func(accessKey string, torrent *Torrent) {
			deletedIDs := torrent.DownloadedIDs.Difference(freshIDs)
			if deletedIDs.Cardinality() > 0 {
				deletedIDs.Each(func(id string) bool {
					torrent.DownloadedIDs.Remove(id)
					return false
				})
				t.writeTorrentToFile(torrent)
			}
		})
	})
}

// StartRefreshJob periodically refreshes the torrents
func (t *TorrentManager) StartRefreshJob() {
	t.workerPool.Submit(func() {
		t.log.Debug("Starting periodic refresh job")
		refreshTicker := time.NewTicker(time.Duration(t.Config.GetRefreshEverySecs()) * time.Second)
		defer refreshTicker.Stop()

		for {
			select {
			case <-refreshTicker.C:
				checksum := t.getCurrentState()
				if t.latestState.Eq(checksum) {
					continue
				}
				t.setNewLatestState(checksum)
				t.refreshTorrents(false)
				t.log.Info("Finished refreshing torrents")
			case <-t.RefreshWorkerKillSwitch:
				t.log.Info("Stopping periodic refresh job")
				return
			}
		}
	})
}

func (t *TorrentManager) getMoreInfo(rdTorrent realdebrid.Torrent) *realdebrid.TorrentInfo {
	info := t.readInfoFromFile(rdTorrent.ID)
	if info == nil {
		var err error
		info, err = t.rd.GetTorrentInfo(rdTorrent.ID)
		if err != nil {
			t.log.Warnf("Cannot get info for torrent %s (id=%s): %v", rdTorrent.Name, rdTorrent.ID, err)
			return nil
		}
		t.writeInfoToFile(info)
	}
	for i := range info.Links {
		if strings.HasPrefix(info.Links[i], "https://real-debrid.com/d/") {
			// set link to max 39 chars (26 + 13)
			info.Links[i] = info.Links[i][0:39]
		}
	}
	return info
}

func (t *TorrentManager) convertToTorrent(info *realdebrid.TorrentInfo) *Torrent {
	torrent := t.readTorrentFromFile("data/" + t.getTorrentInfoFilename(info) + ".zurgtorrent")
	if torrent != nil && torrent.DownloadedIDs.ContainsOne(info.ID) {
		return torrent
	}

	torrent = &Torrent{
		Name:          info.Name,
		OriginalName:  info.OriginalName,
		Added:         info.Added,
		Hash:          info.Hash,
		State:         NewTorrentState("broken_torrent"),
		DownloadedIDs: mapset.NewSet[string](),
	}

	// SelectedFiles is a subset of Files with only the selected ones
	// it also has a Link field, which can be empty
	// if it is empty, it means the file is no longer available
	// Files+Links together are the same as SelectedFiles
	allFilenames := mapset.NewSet[string]()
	dupeFilenames := mapset.NewSet[string]()
	var selectedFiles []*File
	for _, file := range info.Files {
		filename := filepath.Base(file.Path)
		if allFilenames.ContainsOne(filename) {
			dupeFilenames.Add(filename)
		} else {
			allFilenames.Add(filename)
		}
		if file.Selected == 0 {
			continue
		}
		selectedFiles = append(selectedFiles, &File{
			File:  file,
			Ended: info.Ended,
			Link:  "", // no link yet, consider it broken
			State: NewFileState("broken_file"),
		})
	}
	if len(selectedFiles) == len(info.Links) {
		// all links are still intact! good!
		for i, file := range selectedFiles {
			file.Link = info.Links[i]
			file.State.Event(context.Background(), "repair_file")
		}
		torrent.UnassignedLinks = mapset.NewSet[string]()
		torrent.State.Event(context.Background(), "mark_as_repaired")
	} else {
		torrent.UnassignedLinks = mapset.NewSet[string]()
		for _, link := range info.Links {
			torrent.UnassignedLinks.Add(link)
		}
	}
	torrent.SelectedFiles = cmap.New[*File]()
	for _, file := range selectedFiles {
		baseFilename := t.GetPath(file)
		// todo better handling of duplicate filenames
		if dupeFilenames.ContainsOne(baseFilename) {
			extension := filepath.Ext(baseFilename)
			filenameNoExt := strings.TrimSuffix(baseFilename, extension)
			newName := fmt.Sprintf("%s (%d)%s", filenameNoExt, file.ID, extension)
			torrent.SelectedFiles.Set(newName, file)
		} else {
			torrent.SelectedFiles.Set(baseFilename, file)
		}
	}

	torrent.DownloadedIDs.Add(info.ID)

	return torrent
}

func (t *TorrentManager) mergeTorrents(existing, toMerge *Torrent) *Torrent {
	var newer, older *Torrent
	if existing.Added < toMerge.Added {
		newer = toMerge
		older = existing
	} else {
		newer = existing
		older = toMerge
	}

	// base of the merged torrent
	mergedTorrent := &Torrent{
		Name:          older.Name,
		OriginalName:  older.OriginalName,
		Rename:        older.Rename,
		Hash:          older.Hash,
		Added:         older.Added,
		DownloadedIDs: older.DownloadedIDs.Union(newer.DownloadedIDs),

		State: older.State,
	}

	// unrepairable reason
	reasons := mapset.NewSet[string]()
	reasons.Add(older.UnrepairableReason)
	reasons.Add(newer.UnrepairableReason)
	mergedTorrent.UnrepairableReason = strings.Join(reasons.ToSlice(), ", ")

	// selected files
	mergedTorrent.SelectedFiles = cmap.New[*File]()
	newer.SelectedFiles.IterCb(func(key string, file *File) {
		mergedTorrent.SelectedFiles.SetIfAbsent(key, file)
	})
	older.SelectedFiles.IterCb(func(key string, olderFile *File) {
		file, ok := mergedTorrent.SelectedFiles.Get(key)
		if !ok || (file.State.Is("broken_file") && olderFile.State.Is("ok_file")) {
			mergedTorrent.SelectedFiles.Set(key, olderFile)
		}
		// get the file again, set the media info
		file, ok = mergedTorrent.SelectedFiles.Get(key)
		if ok && file.MediaInfo == nil && olderFile.MediaInfo != nil {
			file.MediaInfo = olderFile.MediaInfo
		}
	})

	// unassigned links
	mergedTorrent.UnassignedLinks = mapset.NewSet[string]()
	links := newer.UnassignedLinks.Union(older.UnassignedLinks)
	links.Each(func(link string) bool {
		found := false
		mergedTorrent.SelectedFiles.IterCb(func(key string, file *File) {
			if !found && file.Link == link {
				found = true
			}
		})
		if !found {
			mergedTorrent.UnassignedLinks.Add(link)
		}
		return false
	})

	brokenCount := 0
	okCount := 0
	mergedTorrent.SelectedFiles.IterCb(func(key string, file *File) {
		if !utils.IsVideo(file.Path) && !t.IsPlayable(file.Path) {
			return
		}
		if file.State.Is("broken_file") {
			brokenCount++
		} else if file.State.Is("ok_file") {
			okCount++
		}
	})

	if brokenCount == 0 && okCount > 0 {
		mergedTorrent.State.Event(context.Background(), "mark_as_repaired")
	}

	t.log.Debugf("After merging, torrent %s has %d broken file(s)", t.GetKey(mergedTorrent), brokenCount)

	return mergedTorrent
}

func (t *TorrentManager) assignDirectory(tor *Torrent, triggerHook bool, outputLogs bool) {
	accessKey := t.GetKey(tor)

	t.DirectoryMap.IterCb(func(directory string, torrents cmap.ConcurrentMap[string, *Torrent]) {
		if strings.HasPrefix(directory, "int__") || directory == config.DUMPED_TORRENTS {
			return
		}
		torrents.Remove(accessKey)
	})

	torrentIDs := tor.DownloadedIDs.ToSlice()
	// get filenames needed for directory conditions
	var filenames []string
	var fileSizes []int64
	var mediaInfos []*ffprobe.ProbeData
	unplayable := true
	tor.SelectedFiles.IterCb(func(key string, file *File) {
		filenames = append(filenames, filepath.Base(file.Path))
		fileSizes = append(fileSizes, file.Bytes)
		if file.MediaInfo != nil {
			mediaInfos = append(mediaInfos, file.MediaInfo)
		}
		if utils.IsVideo(file.Path) || t.IsPlayable(file.Path) {
			unplayable = false
		}
	})

	if unplayable {
		if outputLogs {
			t.log.Warnf("No playable files for %s, moving to unplayable directory", accessKey)
		}
		t.markAsUnplayable(tor)
		return
	}

	// Map torrents to directories
	switch t.Config.GetVersion() {
	case "v1":
		updatedPaths := []string{}
		dirs := []string{}
		configV1 := t.Config.(*config.ZurgConfigV1)
		for _, directories := range configV1.GetGroupMap() {
			for _, directory := range directories {
				if t.Config.MeetsConditions(directory, t.GetKey(tor), tor.ComputeTotalSize(), torrentIDs, filenames, fileSizes, mediaInfos) {
					torrents, _ := t.DirectoryMap.Get(directory)
					torrents.Set(accessKey, tor)

					if directory != config.ALL_TORRENTS {
						dirs = append(dirs, directory)
					}

					if triggerHook {
						updatedPaths = append(updatedPaths, fmt.Sprintf("%s/%s", directory, accessKey))
					}
					break
				}
			}
		}
		if triggerHook {
			OnLibraryUpdateHook(updatedPaths, t.Config, t.log)
		}
		if outputLogs {
			t.log.Infof("Assigned %s to: %s", accessKey, strings.Join(dirs, ", "))
		}
	}
}

func (t *TorrentManager) IsPlayable(filePath string) bool {
	playableExts := t.Config.GetPlayableExtensions()
	filePath = strings.ToLower(filePath)
	for _, ext := range playableExts {
		if strings.HasSuffix(filePath, fmt.Sprintf(".%s", ext)) {
			return true
		}
	}
	return false
}