package torrent

import (
	"fmt"
	"os"
	"strings"

	mapset "github.com/deckarep/golang-set/v2"
)

const BINS_FILE = "data/bins.json"

// initializeBins reads from bins.json and assigns values to t.trashBin and t.repairBin
func (t *TorrentManager) initializeBins() {
	if _, err := os.Stat(BINS_FILE); os.IsNotExist(err) {
		t.log.Warn("data/bins.json does not exist. Initializing empty bins.")
		t.ImmediateBin = mapset.NewSet[string]()
		t.OnceDoneBin = mapset.NewSet[string]()
		return
	}

	fileData, err := os.ReadFile(BINS_FILE)
	if err != nil {
		t.log.Errorf("Failed to read bins.json file: %v", err)
		t.ImmediateBin = mapset.NewSet[string]()
		t.OnceDoneBin = mapset.NewSet[string]()
		return
	}

	data := map[string][]string{}

	err = json.Unmarshal(fileData, &data)
	if err != nil {
		t.log.Errorf("Failed to unmarshal bin data: %v", err)
		return
	}

	t.ImmediateBin = mapset.NewSet[string](data["trash_bin"]...)
	t.OnceDoneBin = mapset.NewSet[string](data["repair_bin"]...)

	t.log.Debugf("Bin immediately: %v", t.ImmediateBin.ToSlice())
	t.log.Debugf("Bin once done: %v", t.OnceDoneBin.ToSlice())
}
func (t *TorrentManager) setToBinImmediately(torrentId string) {
	t.log.Debugf("Set to delete immediately: %s", torrentId)
	t.ImmediateBin.Add(torrentId)
	t.persistBins()
}

func (t *TorrentManager) setToBinOnceDone(torrentId string) {
	t.log.Debugf("Set to delete once completed: %s", torrentId)
	t.OnceDoneBin.Add(torrentId)
	t.persistBins()
}

func (t *TorrentManager) binImmediately(torrentId string) bool {
	if t.ImmediateBin.Contains(torrentId) {
		if err := t.api.DeleteTorrent(torrentId); err != nil {
			t.log.Errorf("Failed to delete torrent %s: %v", torrentId, err)
			return false
		}
		t.ImmediateBin.Remove(torrentId)
		return true
	}
	return false
}

func (t *TorrentManager) binOnceDoneErrorCheck(torrentId, status string) bool {
	okStatuses := mapset.NewSet("downloading", "downloaded", "uploading", "queued", "compressing")
	if !okStatuses.Contains(status) {
		return t.binOnceDone(torrentId)
	}
	return false
}

func (t *TorrentManager) binOnceDone(torrentId string) bool {
	found := false
	binnedIDs := t.OnceDoneBin.ToSlice()
	// special case: xxx-yyy means if xxx is done, delete yyy
	specialCase := fmt.Sprintf("%s-", torrentId)
	for _, entry := range binnedIDs {
		if strings.Contains(entry, specialCase) {
			idToDelete := strings.Split(entry, "-")[1]
			if err := t.api.DeleteTorrent(idToDelete); err != nil {
				t.log.Errorf("Failed to delete torrent %s: %v", idToDelete, err)
				continue
			}
			t.OnceDoneBin.Remove(entry)
			found = true
		} else if entry == torrentId {
			if err := t.api.DeleteTorrent(torrentId); err != nil {
				t.log.Errorf("Failed to delete torrent %s: %v", torrentId, err)
				return false
			}
			t.OnceDoneBin.Remove(torrentId)
			return true
		}
	}

	return found
}

func (t *TorrentManager) persistBins() {
	data := map[string]interface{}{
		"trash_bin":  t.ImmediateBin.ToSlice(), // Assuming trashBin is a mapset.Set[string]
		"repair_bin": t.OnceDoneBin.ToSlice(),  // Assuming repairBin is a mapset.Set[string]
	}

	jsonData, err := json.Marshal(data)
	if err != nil {
		t.log.Errorf("Failed to marshal bin data: %v", err)
		return
	}

	file, err := os.Create(BINS_FILE)
	if err != nil {
		t.log.Errorf("Failed to create bins.json file: %v", err)
		return
	}
	defer file.Close()

	_, err = file.Write(jsonData)
	if err != nil {
		t.log.Errorf("Failed to write to bins.json file: %v", err)
	}
}

func (t *TorrentManager) cleanupBins(freshIDs mapset.Set[string]) {
	t.ImmediateBin.Difference(freshIDs).Each(func(id string) bool {
		t.ImmediateBin.Remove(id)
		return false
	})
	t.OnceDoneBin.Difference(freshIDs).Each(func(id string) bool {
		t.OnceDoneBin.Remove(id)
		return false
	})
	t.persistBins()
}