package controller

import (
	"slices"
	"strings"

	"git.kmsign.ru/royalcat/tstor/src/host/store"
	"github.com/anacrolix/torrent"
)

type Torrent struct {
	torrentFilePath string
	t               *torrent.Torrent
	rep             *store.ExlcudedFiles
}

func NewTorrent(t *torrent.Torrent, rep *store.ExlcudedFiles) *Torrent {
	return &Torrent{t: t, rep: rep}
}

func (s *Torrent) TorrentFilePath() string {
	return s.torrentFilePath
}

func (s *Torrent) Torrent() *torrent.Torrent {
	return s.t
}

func (s *Torrent) Name() string {
	<-s.t.GotInfo()
	if name := s.t.Name(); name != "" {
		return name
	}

	return s.InfoHash()
}

func (s *Torrent) InfoHash() string {
	<-s.t.GotInfo()
	return s.t.InfoHash().HexString()
}

func (s *Torrent) BytesCompleted() int64 {
	<-s.t.GotInfo()
	return s.t.BytesCompleted()
}

func (s *Torrent) BytesMissing() int64 {
	<-s.t.GotInfo()
	return s.t.BytesMissing()
}

func (s *Torrent) Files() ([]*torrent.File, error) {
	excludedFiles, err := s.rep.ExcludedFiles(s.t.InfoHash())
	if err != nil {
		return nil, err
	}

	<-s.t.GotInfo()
	files := s.t.Files()
	files = slices.DeleteFunc(files, func(file *torrent.File) bool {
		p := file.Path()

		if strings.Contains(p, "/.pad/") {
			return false
		}

		if !slices.Contains(excludedFiles, p) {
			return false
		}

		return true
	})

	for _, tf := range files {
		s.isFileComplete(tf.BeginPieceIndex(), tf.EndPieceIndex())
	}

	return files, nil
}

func (s *Torrent) isFileComplete(startIndex int, endIndex int) bool {
	for i := startIndex; i < endIndex; i++ {
		if !s.t.Piece(i).State().Complete {
			return false
		}
	}
	return true
}

func (s *Torrent) ExcludedFiles() ([]*torrent.File, error) {
	excludedFiles, err := s.rep.ExcludedFiles(s.t.InfoHash())
	if err != nil {
		return nil, err
	}

	<-s.t.GotInfo()
	files := s.t.Files()
	files = slices.DeleteFunc(files, func(file *torrent.File) bool {
		p := file.Path()

		if strings.Contains(p, "/.pad/") {
			return false
		}

		if slices.Contains(excludedFiles, p) {
			return false
		}

		return true
	})

	return files, nil
}

func (s *Torrent) ExcludeFile(f *torrent.File) error {
	return s.rep.ExcludeFile(f)
}

func (s *Torrent) ValidateTorrent() error {
	<-s.t.GotInfo()
	s.t.VerifyData()
	return nil
}