package torrent

import (
	"io"
	"os"
	"strings"

	"github.com/debridmediamanager/zurg/pkg/realdebrid"
	cmap "github.com/orcaman/concurrent-map/v2"
)

// fixers are commands that will be run on the next refresh
// they are stored in a file so that they can be run on startup
// they follow the format of:
// key: <id_trigger> value: <command>
// id_trigger: this means a specific torrent id's completion
// commands: delete | repair

func (t *TorrentManager) fixerAddCommand(trigger, command string) {
	t.log.Debugf("Adding fixer command: %s %s", trigger, command)
	t.fixers.Set(trigger, command)
	t.writeFixersToFile()
}

func (t *TorrentManager) processFixers(instances []realdebrid.Torrent) {
	t.log.Debugf("Processing fixers (%d left: %v)", t.fixers.Count(), t.fixers.Keys())
	var toDelete []string
	var toRedownload []*Torrent
	allTorrents, _ := t.DirectoryMap.Get(INT_ALL)
	for _, instance := range instances {
		id := instance.ID
		if !t.fixers.Has(id) {
			continue
		}
		command, _ := t.fixers.Pop(id) // delete the fixer if it's done
		switch command {
		case "replaced": // id is old torrent id
			t.log.Debugf("Deleting old id=%s because it's redundant to fixed %s ", id, instance.Name)
			toDelete = append(toDelete, id)
			continue

		case "download_failed": // id is failed fixer id
			t.log.Debugf("Deleting failed fixer id=%s of torrent %s", id, instance.Name)
			toDelete = append(toDelete, id)
			continue

		case "repaired": // this torrent contains broken files
			if instance.Progress != 100 {
				t.fixers.Set(id, command) // requeue the fixer
				continue
			}

			torrent := t.getMoreInfo(instance)
			t.log.Debugf("Repairing torrent %s again now that fixer id=%s is done", t.GetKey(torrent), id)
			repairMe, _ := allTorrents.Get(t.GetKey(torrent))
			toRedownload = append(toRedownload, repairMe)
			toDelete = append(toDelete, id)
			continue
		}

		// a new case: repaired_with:<id>
		if strings.HasPrefix(command, "repaired_with:") {
			if instance.Progress != 100 {
				t.fixers.Set(id, command) // requeue the fixer
				continue
			}

			otherId := strings.TrimPrefix(command, "repaired_with:")
			for _, instance2 := range instances {
				if instance2.ID == otherId {
					if instance2.Progress != 100 {
						t.fixers.Set(id, command) // requeue the fixer
						break
					}
					torrent := t.getMoreInfo(instance2)
					t.log.Debugf("Repairing torrent %s again now that fixers ids=%s and %s are done", t.GetKey(torrent), id, otherId)
					repairMe, _ := allTorrents.Get(t.GetKey(torrent))
					toRedownload = append(toRedownload, repairMe)
					toDelete = append(toDelete, id, otherId)
					break
				}
			}

			continue
		}
	}

	infoCache, _ := t.DirectoryMap.Get(INT_INFO_CACHE)
	for _, id := range toDelete {
		t.Api.DeleteTorrent(id)
		infoCache.Remove(id)
		t.deleteTorrentFile(id)
	}

	for _, torrent := range toRedownload {
		t.redownloadTorrent(torrent, "")
	}

	t.writeFixersToFile()

	t.log.Debugf("Finished processing fixers")
}

func (t *TorrentManager) removeExpiredFixers(instances []realdebrid.Torrent) {
	fixers := t.fixers.Keys()
	if len(fixers) == 0 {
		return
	}
	for _, fixerID := range fixers {
		found := false
		for _, instance := range instances {
			if instance.ID == fixerID {
				found = true
				break
			}
		}
		if !found {
			t.log.Debugf("Removing expired fixer id=%s", fixerID)
			t.fixers.Remove(fixerID)
		}
	}
}

func (t *TorrentManager) writeFixersToFile() {
	filePath := "data/fixers.json"
	file, err := os.Create(filePath)
	if err != nil {
		t.log.Warnf("Cannot create fixer file %s: %v", filePath, err)
		return
	}
	defer file.Close()

	fileData, err := t.fixers.MarshalJSON()
	if err != nil {
		t.log.Warnf("Cannot marshal fixers: %v", err)
		return
	}

	_, err = file.Write(fileData)
	if err != nil {
		t.log.Warnf("Cannot write to fixer file %s: %v", filePath, err)
		return
	}
}

func (t *TorrentManager) readFixersFromFile() (ret cmap.ConcurrentMap[string, string]) {
	ret = cmap.New[string]()
	filePath := "data/fixers.json"
	file, err := os.Open(filePath)
	if err != nil {
		if os.IsNotExist(err) {
			return
		}
		t.log.Warnf("Cannot open fixer file %s: %v", filePath, err)
		return
	}
	defer file.Close()
	fileData, err := io.ReadAll(file)
	if err != nil {
		t.log.Warnf("Cannot read fixer file %s: %v", filePath, err)
		return
	}

	err = ret.UnmarshalJSON(fileData)
	if err != nil {
		t.log.Warnf("Cannot unmarshal fixer file %s: %v", filePath, err)
		return
	}

	return
}