package shows

import (
	"encoding/json"
	"fmt"
	"time"

	"git.quimbo.fr/odwrtw/canape/backend/models"
	"git.quimbo.fr/odwrtw/canape/backend/subtitles"
	"git.quimbo.fr/odwrtw/canape/backend/web"
	"github.com/odwrtw/errors"
	polochon "github.com/odwrtw/polochon/lib"
	"github.com/odwrtw/polochon/lib/papi"
	"github.com/sirupsen/logrus"
)

// Episode represents an episode
type Episode struct {
	show *Show
	*polochon.ShowEpisode
}

// MarshalJSON implements the Marshal interface
func (e *Episode) MarshalJSON() ([]byte, error) {
	type alias Episode

	var downloadURL string
	var subs []subtitles.Subtitle
	var dateAdded time.Time
	var quality string
	var audioCodec string
	var videoCodec string
	var container string

	// If the episode is present, fill the downloadURL
	if e.show.pShow != nil {
		pEpisode := e.show.pShow.GetEpisode(e.Season, e.Episode)
		if pEpisode != nil {
			// Get the DownloadURL
			downloadURL, _ = e.show.client.DownloadURL(
				&papi.Episode{
					ShowEpisode: &polochon.ShowEpisode{
						ShowImdbID: e.ShowImdbID,
						Episode:    e.Episode,
						Season:     e.Season,
					},
				},
			)
			dateAdded = pEpisode.DateAdded
			quality = string(pEpisode.Quality)
			audioCodec = pEpisode.AudioCodec
			videoCodec = pEpisode.VideoCodec
			container = pEpisode.Container

			// Append the Subtitles
			for _, l := range pEpisode.Subtitles {
				subtitleURL, _ := e.show.client.SubtitleURL(pEpisode, l)
				subs = append(subs, subtitles.Subtitle{
					Language: l,
					URL:      subtitleURL,
					VVTFile:  fmt.Sprintf("/shows/%s/seasons/%d/episodes/%d/subtitles/%s", e.ShowImdbID, e.Season, e.Episode, l),
				})
			}
		}
	}

	// Marshal the episode with its polochon_url
	episodeToMarshal := &struct {
		*alias
		PolochonURL string               `json:"polochon_url"`
		Subtitles   []subtitles.Subtitle `json:"subtitles"`
		DateAdded   time.Time            `json:"date_added"`
		Quality     string               `json:"quality"`
		AudioCodec  string               `json:"audio_codec"`
		VideoCodec  string               `json:"video_codec"`
		Container   string               `json:"container"`
		Thumb       string               `json:"thumb"`
	}{
		alias:       (*alias)(e),
		PolochonURL: downloadURL,
		Subtitles:   subs,
		DateAdded:   dateAdded,
		Quality:     quality,
		AudioCodec:  audioCodec,
		VideoCodec:  videoCodec,
		Container:   container,
		Thumb:       e.Thumb,
	}

	return json.Marshal(episodeToMarshal)
}

// NewEpisode returns an Episode
func NewEpisode(show *Show, season, episode int) *Episode {
	return &Episode{
		show: show,
		ShowEpisode: &polochon.ShowEpisode{
			ShowImdbID: show.ImdbID,
			Season:     season,
			Episode:    episode,
		},
	}
}

// GetAndFetchTorrents retrieves torrents for the episode with the given
// torrenters 'before'
// If found, return
// If not, retrives torrents with the torrenters 'after' and update them in
// database
func (e *Episode) GetAndFetchTorrents(env *web.Env, before []polochon.Torrenter, after []polochon.Torrenter) error {
	log := env.Log.WithFields(logrus.Fields{
		"imdb_id":  e.ShowImdbID,
		"season":   e.Season,
		"episode":  e.Episode,
		"function": "episodes.GetAndFetchTorrents",
	})

	// Try to get details with the first batch of Detailers
	err := e.GetTorrents(env, before)
	if err == nil {
		log.Debug("episode torrents found in first try")
		return nil
	}
	log.Debugf("episode torrent not found in database: %s", err)

	// If not found, try the second batch and upsert
	return e.RefreshTorrents(env, after)
}

// GetTorrents retrieves torrents for the episode with the given torrenters
func (e *Episode) GetTorrents(env *web.Env, torrenters []polochon.Torrenter) error {
	return GetTorrents(env, e.ShowEpisode, torrenters)
}

// GetTorrents retrieves torrents for the episode with the given torrenters
func GetTorrents(env *web.Env, showEpisode *polochon.ShowEpisode, torrenters []polochon.Torrenter) error {
	log := env.Log.WithFields(logrus.Fields{
		"imdb_id":  showEpisode.ShowImdbID,
		"season":   showEpisode.Season,
		"episode":  showEpisode.Episode,
		"function": "episodes.GetTorrents",
	})
	log.Debugf("getting torrents")

	showEpisode.Torrenters = torrenters

	err := polochon.GetTorrents(showEpisode, env.Log)
	if err != nil {
		return err
	}

	log.Debugf("got %d torrents from torrenters", len(showEpisode.Torrents))

	return nil
}

// RefreshTorrents refresh the episode torrents
func (e *Episode) RefreshTorrents(env *web.Env, torrenters []polochon.Torrenter) error {
	return RefreshTorrents(env, e.ShowEpisode, torrenters)
}

// RefreshTorrents refresh the episode torrents
func RefreshTorrents(env *web.Env, showEpisode *polochon.ShowEpisode, torrenters []polochon.Torrenter) error {
	log := env.Log.WithFields(logrus.Fields{
		"imdb_id":  showEpisode.ShowImdbID,
		"season":   showEpisode.Season,
		"episode":  showEpisode.Episode,
		"function": "episodes.RefreshTorrents",
	})
	log.Debugf("refreshing torrents")

	// Refresh
	err := GetTorrents(env, showEpisode, torrenters)
	if err != nil {
		return err
	}

	// Upsert all the torrents we got
	for _, t := range showEpisode.Torrents {
		t.ImdbID = showEpisode.ShowImdbID
		t.Season = showEpisode.Season
		t.Episode = showEpisode.Episode
		err = models.UpsertEpisodeTorrent(env.Database, t)
		if err != nil {
			log.Errorf("error while adding torrent : %s", err)
			continue
		}
	}

	return nil
}

// Refresh retrieves details for the episode with the given detailers
// and update them in database
func (e *Episode) Refresh(env *web.Env, detailers []polochon.Detailer) error {
	// Refresh
	err := e.GetEpisodeDetails(env, detailers)
	if err != nil {
		return err
	}

	return models.UpsertEpisode(env.Database, e.ShowEpisode)
}

// GetEpisodeDetails retrieves details for the episode with the given detailers
func (e *Episode) GetEpisodeDetails(env *web.Env, detailers []polochon.Detailer) error {
	log := env.Log.WithFields(logrus.Fields{
		"imdb_id":  e.ShowImdbID,
		"function": "episodes.GetDetails",
	})
	log.Debugf("getting details")

	e.ShowEpisode.Detailers = detailers

	// Get the details
	err := polochon.GetDetails(e.ShowEpisode, log)
	if err != nil {
		if errors.IsFatal(err) {
			return err
		}
	}

	log.Debug("got details from detailers")

	return nil
}