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.repairLog.Info("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.repairLog.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.repairLog.Errorf("Failed to unmarshal bin data: %v", err)
		t.ImmediateBin = mapset.NewSet[string]()
		t.OnceDoneBin = mapset.NewSet[string]()
		return
	}

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

	t.repairLog.Debugf("Bin immediately: %v", t.ImmediateBin.ToSlice())
	t.repairLog.Debugf("Bin once done: %v", t.OnceDoneBin.ToSlice())
}

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.repairLog.Errorf("Failed to marshal bin data: %v", err)
		return
	}

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

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

func (t *TorrentManager) setToBinImmediately(torrentId string) {
	t.repairLog.Debugf("id=%s set to delete immediately", torrentId)
	t.ImmediateBin.Add(torrentId)
	t.persistBins()
}

func (t *TorrentManager) setToBinOnceDone(torrentId string) {
	t.repairLog.Debugf("id=%s set to delete once it completes", torrentId)
	t.OnceDoneBin.Add(torrentId)
	t.persistBins()
}

func (t *TorrentManager) setXToBinOnceYDone(deleteId, completeId string) {
	t.repairLog.Debugf("id=%s set to delete once id=%s completes", deleteId, completeId)
	t.OnceDoneBin.Add(fmt.Sprintf("%s-", completeId))
	t.OnceDoneBin.Add(fmt.Sprintf("%s-%s", completeId, deleteId))
	t.persistBins()
}

func (t *TorrentManager) cleanupBins(freshIDs mapset.Set[string]) {
	t.ImmediateBin.Clone().Each(func(entry string) bool {
		if !freshIDs.Contains(entry) {
			t.ImmediateBin.Remove(entry)
		}
		return false
	})
	t.OnceDoneBin.Clone().Each(func(entry string) bool {
		// check if the entry is a special case
		if strings.Contains(entry, "-") {
			// format is: id1-id2 or id1-
			// if either id1 or id2 is not fresh, remove the entry
			ids := strings.Split(entry, "-")
			if !freshIDs.Contains(ids[0]) || (ids[1] != "" && !freshIDs.Contains(ids[1])) {
				t.OnceDoneBin.Remove(entry)
			}
			return false
		}
		if !freshIDs.Contains(entry) {
			t.OnceDoneBin.Remove(entry)
		}
		return false
	})
	t.persistBins()
}

// binImmediatelyErrorCheck checks if the torrent is in the ImmediateBin and deletes it if it is.
// returns true if the torrent was in the bin and was deleted, false otherwise
func (t *TorrentManager) binImmediately(torrentId string) bool {
	if t.ImmediateBin.Contains(torrentId) {
		if err := t.api.DeleteTorrent(torrentId); err != nil {
			t.repairLog.Warnf("Failed to delete torrent %s: %v", torrentId, err)
		}
		t.ImmediateBin.Remove(torrentId)
		t.repairLog.Debugf("Bin: immediate deletion of torrent %s", torrentId)
		t.persistBins()
		return true
	}
	return false
}

// binOnceDoneErrorCheck checks if the torrent is in error states and then checks if it should be deleted
func (t *TorrentManager) binOnceDoneErrorCheck(torrentId, status string) bool {
	if status == "downloading" || status == "downloaded" || status == "uploading" || status == "queued" || status == "compressing" || status == "waiting_files_selection" {
		return false
	}
	t.repairLog.Infof("Bin: error status=%s, checking if %s should be deleted", status, torrentId)
	return t.binOnceDone(torrentId, true)
}

// binOnceDone checks if the torrent is in the OnceDoneBin and deletes it if it is.
// returns true if the torrent was in the bin and was deleted, false otherwise
func (t *TorrentManager) binOnceDone(completedTorrentId string, errorCheck bool) bool {
	if t.OnceDoneBin.Contains(completedTorrentId) {
		if err := t.api.DeleteTorrent(completedTorrentId); err != nil {
			t.repairLog.Warnf("Failed to delete torrent %s: %v", completedTorrentId, err)
		}
		t.deleteInfoFile(completedTorrentId)
		t.OnceDoneBin.Remove(completedTorrentId)
		if errorCheck {
			t.repairLog.Errorf("Bin: error deletion of torrent %s", completedTorrentId)
		} else {
			t.repairLog.Debugf("Bin: done deletion of torrent %s", completedTorrentId)
		}
		t.persistBins()
		return true
	}

	// special case: yyy-xxx means if yyy is done, delete xxx
	specialCase := fmt.Sprintf("%s-", completedTorrentId)
	if !t.OnceDoneBin.Contains(specialCase) {
		return false
	}
	t.deleteInfoFile(completedTorrentId)
	t.OnceDoneBin.Remove(specialCase)
	t.OnceDoneBin.Clone().Each(func(entry string) bool {
		if strings.Contains(entry, specialCase) {
			if errorCheck {
				if err := t.api.DeleteTorrent(completedTorrentId); err != nil {
					t.repairLog.Warnf("Failed to delete torrent %s: %v", completedTorrentId, err)
				}
				t.OnceDoneBin.Remove(entry)
				t.repairLog.Errorf("Bin: error deletion of torrent %s", completedTorrentId)
			} else {
				idToDelete := strings.Split(entry, "-")[1]
				if err := t.api.DeleteTorrent(idToDelete); err != nil {
					t.repairLog.Warnf("Failed to delete torrent %s: %v", idToDelete, err)
				}
				t.OnceDoneBin.Remove(entry)
				t.repairLog.Debugf("Bin: %s completed, done deletion of torrent %s", completedTorrentId, idToDelete)
			}
		}
		return false
	})
	t.persistBins()
	return true
}