package server

import (
	"fmt"
	"polaris/ent"
	"polaris/ent/episode"
	"polaris/ent/history"
	"polaris/ent/media"
	"polaris/log"
	"polaris/pkg/notifier/message"
	"polaris/pkg/torznab"
	"polaris/pkg/utils"
	"polaris/server/core"

	"github.com/gin-gonic/gin"
	"github.com/pkg/errors"
)

func (s *Server) searchAndDownloadSeasonPackage(seriesId, seasonNum int) (*string, error) {

	res, err := core.SearchSeasonPackage(s.db, seriesId, seasonNum, true)
	if err != nil {
		return nil, err
	}

	r1 := res[0]
	log.Infof("found resource to download: %+v", r1)
	return s.downloadSeasonPackage(r1, seriesId, seasonNum)

}

func (s *Server) downloadSeasonPackage(r1 torznab.Result, seriesId, seasonNum int) (*string, error) {
	trc, err := s.getDownloadClient()
	if err != nil {
		return nil, errors.Wrap(err, "connect transmission")
	}
	downloadDir := s.db.GetDownloadDir()
	size := utils.AvailableSpace(downloadDir)
	if size < uint64(r1.Size) {
		log.Errorf("space available %v, space needed %v", size, r1.Size)
		return nil, errors.New("no enough space")
	}

	torrent, err := trc.Download(r1.Link, s.db.GetDownloadDir())
	if err != nil {
		return nil, errors.Wrap(err, "downloading")
	}
	torrent.Start()

	series := s.db.GetMediaDetails(seriesId)
	if series == nil {
		return nil, fmt.Errorf("no tv series of id %v", seriesId)
	}
	dir := fmt.Sprintf("%s/Season %02d/", series.TargetDir, seasonNum)

	history, err := s.db.SaveHistoryRecord(ent.History{
		MediaID:     seriesId,
		EpisodeID:   0,
		SourceTitle: r1.Name,
		TargetDir:   dir,
		Status:      history.StatusRunning,
		Size:        r1.Size,
		Saved:       torrent.Save(),
	})
	if err != nil {
		return nil, errors.Wrap(err, "save record")
	}
	s.db.SetSeasonAllEpisodeStatus(seriesId, seasonNum, episode.StatusDownloading)

	s.tasks[history.ID] = &Task{Torrent: torrent}

	s.sendMsg(fmt.Sprintf(message.BeginDownload, r1.Name))
	return &r1.Name, nil

}

func (s *Server) downloadEpisodeTorrent(r1 torznab.Result, seriesId, seasonNum, episodeNum int) (*string, error) {
	trc, err := s.getDownloadClient()
	if err != nil {
		return nil, errors.Wrap(err, "connect transmission")
	}
	series := s.db.GetMediaDetails(seriesId)
	if series == nil {
		return nil, fmt.Errorf("no tv series of id %v", seriesId)
	}
	var ep *ent.Episode
	for _, e := range series.Episodes {
		if e.SeasonNumber == seasonNum && e.EpisodeNumber == episodeNum {
			ep = e
		}
	}
	if ep == nil {
		return nil, errors.Errorf("no episode of season %d episode %d", seasonNum, episodeNum)
	}
	torrent, err := trc.Download(r1.Link, s.db.GetDownloadDir())
	if err != nil {
		return nil, errors.Wrap(err, "downloading")
	}
	torrent.Start()

	dir := fmt.Sprintf("%s/Season %02d/", series.TargetDir, seasonNum)

	history, err := s.db.SaveHistoryRecord(ent.History{
		MediaID:     ep.MediaID,
		EpisodeID:   ep.ID,
		SourceTitle: r1.Name,
		TargetDir:   dir,
		Status:      history.StatusRunning,
		Size:        r1.Size,
		Saved:       torrent.Save(),
	})
	if err != nil {
		return nil, errors.Wrap(err, "save record")
	}
	s.db.SetEpisodeStatus(ep.ID, episode.StatusDownloading)

	s.tasks[history.ID] = &Task{Torrent: torrent}
	s.sendMsg(fmt.Sprintf(message.BeginDownload, r1.Name))

	log.Infof("success add %s to download task", r1.Name)
	return &r1.Name, nil

}
func (s *Server) searchAndDownload(seriesId, seasonNum, episodeNum int) (*string, error) {

	res, err := core.SearchEpisode(s.db, seriesId, seasonNum, episodeNum, true)
	if err != nil {
		return nil, err
	}
	r1 := res[0]
	log.Infof("found resource to download: %+v", r1)
	return s.downloadEpisodeTorrent(r1, seriesId, seasonNum, episodeNum)
}

type searchAndDownloadIn struct {
	ID      int `json:"id" binding:"required"`
	Season  int `json:"season"`
	Episode int `json:"episode"`
}

func (s *Server) SearchAvailableTorrents(c *gin.Context) (interface{}, error) {
	var in searchAndDownloadIn
	if err := c.ShouldBindJSON(&in); err != nil {
		return nil, errors.Wrap(err, "bind json")
	}
	m, err := s.db.GetMedia(in.ID)
	if err != nil {
		return nil, errors.Wrap(err, "get media")
	}
	log.Infof("search torrents resources link: %+v", in)

	var res []torznab.Result
	if m.MediaType == media.MediaTypeTv {
		if in.Episode == 0 {
			//search season package
			log.Infof("search series season package S%02d", in.Season)
			res, err = core.SearchSeasonPackage(s.db, in.ID, in.Season, false)
			if err != nil {
				return nil, errors.Wrap(err, "search season package")
			}
		} else {
			log.Infof("search series episode S%02dE%02d", in.Season, in.Episode)
			res, err = core.SearchEpisode(s.db, in.ID, in.Season, in.Episode, false)
			if err != nil {
				if err.Error() == "no resource found" {
					return []TorznabSearchResult{}, nil
				}
				return nil, errors.Wrap(err, "search episode")
			}

		}
	} else {
		log.Info("search movie %d", in.ID)
		res, err = core.SearchMovie(s.db, in.ID, false)
		if err != nil {
			if err.Error() == "no resource found" {
				return []TorznabSearchResult{}, nil
			}
			return nil, err
		}
	}
	var searchResults []TorznabSearchResult
	for _, r := range res {
		searchResults = append(searchResults, TorznabSearchResult{
			Name:    r.Name,
			Size:    r.Size,
			Seeders: r.Seeders,
			Peers:   r.Peers,
			Link:    r.Link,
		})
	}
	return searchResults, nil
}

func (s *Server) SearchTvAndDownload(c *gin.Context) (interface{}, error) {
	var in searchAndDownloadIn
	if err := c.ShouldBindJSON(&in); err != nil {
		return nil, errors.Wrap(err, "bind json")
	}
	log.Infof("search episode resources link: %v", in)
	var name string
	if in.Episode == 0 {
		log.Infof("season package search")
		//search season package
		name1, err := s.searchAndDownloadSeasonPackage(in.ID, in.Season)
		if err != nil {
			return nil, errors.Wrap(err, "download")
		}
		name = *name1
	} else {
		log.Infof("season episode search")
		name1, err := s.searchAndDownload(in.ID, in.Season, in.Episode)
		if err != nil {
			return nil, errors.Wrap(err, "download")
		}
		name = *name1
	}

	return gin.H{
		"name": name,
	}, nil
}

type TorznabSearchResult struct {
	Name    string `json:"name"`
	Size    int    `json:"size"`
	Link    string `json:"link"`
	Seeders int    `json:"seeders"`
	Peers   int    `json:"peers"`
	Source  string `json:"source"`
}
type downloadTorrentIn struct {
	MediaID int `json:"id" binding:"required"`
	Season  int `json:"season"`
	Episode int `json:"episode"`
	TorznabSearchResult
}

func (s *Server) DownloadTorrent(c *gin.Context) (interface{}, error) {
	var in downloadTorrentIn
	if err := c.ShouldBindJSON(&in); err != nil {
		return nil, errors.Wrap(err, "bind json")
	}
	log.Infof("download torrent input: %+v", in)

	m, err := s.db.GetMedia(in.MediaID)
	if err != nil {
		return nil, fmt.Errorf("no tv series of id %v", in.MediaID)
	}
	if m.MediaType == media.MediaTypeTv {
		if in.Episode == 0 {
			//download season package
			name := in.Name
			if name == "" {
				name = fmt.Sprintf("%v S%02d", m.OriginalName, in.Season)
			}
			res := torznab.Result{Name: name, Link: in.Link, Size: in.Size}
			return s.downloadSeasonPackage(res, in.MediaID, in.Season)
		}
		name := in.Name
		if name == "" {
			name = fmt.Sprintf("%v S%02dE%02d", m.OriginalName, in.Season, in.Episode)
		}
		res := torznab.Result{Name: name, Link: in.Link, Size: in.Size}
		return s.downloadEpisodeTorrent(res, in.MediaID, in.Season, in.Episode)
	}
	trc, err := s.getDownloadClient()
	if err != nil {
		return nil, errors.Wrap(err, "connect transmission")
	}

	torrent, err := trc.Download(in.Link, s.db.GetDownloadDir())
	if err != nil {
		return nil, errors.Wrap(err, "downloading")
	}
	torrent.Start()
	name := in.Name
	if name == "" {
		name = m.OriginalName
	}
	go func() {
		ep, _ := s.db.GetMovieDummyEpisode(m.ID)
		history, err := s.db.SaveHistoryRecord(ent.History{
			MediaID:     m.ID,
			EpisodeID:   ep.ID,
			SourceTitle: name,
			TargetDir:   m.TargetDir,
			Status:      history.StatusRunning,
			Size:        in.Size,
			Saved:       torrent.Save(),
		})
		if err != nil {
			log.Errorf("save history error: %v", err)
		}

		s.tasks[history.ID] = &Task{Torrent: torrent}

		s.db.SetEpisodeStatus(ep.ID, episode.StatusDownloading)
	}()

	s.sendMsg(fmt.Sprintf(message.BeginDownload, in.Name))
	log.Infof("success add %s to download task", in.Name)
	return in.Name, nil

}