package shows

import (
	"fmt"

	"gitlab.quimbo.fr/odwrtw/canape-sql/sqly"
	"gitlab.quimbo.fr/odwrtw/canape-sql/users"

	"github.com/Sirupsen/logrus"
	"github.com/jmoiron/sqlx"
	"github.com/odwrtw/polochon/lib"
)

const (
	addShowQuery         = `INSERT INTO shows (imdbid, title) VALUES (:imdbid, :title) RETURNING id;`
	getShowQueryByImdbID = `SELECT * FROM shows WHERE imdbid=$1;`
	getShowQueryByID     = `SELECT * FROM shows WHERE id=$1;`
	deleteShowQuery      = `DELETE FROM shows WHERE id=$1;`

	addEpisodeQuery  = `INSERT INTO episodes (shows_id, title, season, episode) VALUES ($1,$2,$3,$4);`
	getEpisodesQuery = `SELECT title, season, episode FROM episodes WHERE shows_id=$1;`

	getShowWithUserQueryByImdbID = `
	SELECT
	shows.id,
	shows.title,
	shows.imdbid,
	COALESCE(shows_tracked.season,0) AS trackedseason,
	COALESCE(shows_tracked.episode,0) AS trackedepisode
	FROM shows LEFT JOIN shows_tracked ON shows.id=shows_tracked.shows_id AND shows_tracked.users_id=$2
	WHERE shows.imdbid=$1;`

	getShowWithUserQueryByID = `
	SELECT
	shows.id,
	shows.title,
	shows.imdbid,
	COALESCE(shows_tracked.season,0) AS trackedseason,
	COALESCE(shows_tracked.episode,0) AS trackedepisode
	FROM shows LEFT JOIN shows_tracked ON shows.id=shows_tracked.shows_id AND shows_tracked.users_id=$2
	WHERE shows.id=$1;`
)

var (
	// NotFound error returned when show not found in database
	ErrNotFound = fmt.Errorf("Not found")
)

type Show struct {
	sqly.BaseTable
	polochon.Show
	Episodes       []*Episode
	TrackedSeason  int
	TrackedEpisode int
}

// New returns a new Show with a polochon ShowConfig
func New(conf polochon.ShowConfig) *Show {
	return &Show{Show: polochon.Show{ShowConfig: conf}}
}

// Get returns show details in database from id or imdbid or an error
func (s *Show) Get(db *sqlx.DB) error {
	var err error
	if s.ID != "" {
		err = db.QueryRowx(getShowQueryByID, s.ID).StructScan(s)
	} else if s.ImdbID != "" {
		err = db.QueryRowx(getShowQueryByImdbID, s.ImdbID).StructScan(s)
	} else {
		err = fmt.Errorf("Can't get show details, you have to specify an ID or ImdbID")
	}
	if err != nil {
		if err.Error() == "sql: no rows in result set" {
			return ErrNotFound
		}
		return err
	}
	return nil
}

// GetAsUser returns a show with user info like tracked
func (s *Show) GetAsUser(db *sqlx.DB, user *users.User) error {
	var err error
	if s.ID != "" {
		err = db.QueryRowx(getShowWithUserQueryByID, s.ID, user.ID).StructScan(s)
	} else if s.ImdbID != "" {
		err = db.QueryRowx(getShowWithUserQueryByImdbID, s.ImdbID, user.ID).StructScan(s)
	} else {
		err = fmt.Errorf("Can't get show details, you have to specify an ID or ImdbID")
	}
	if err != nil {
		if err.Error() == "sql: no rows in result set" {
			return ErrNotFound
		}
		return err
	}
	return nil
}

// GetDetails retrieves details for the show, first try to
// get info from db, if not exists, use polochon.Detailer
// and save informations in the database for future use
func (s *Show) GetDetails(db *sqlx.DB, log *logrus.Entry) error {
	var err error
	err = s.Get(db)
	if err == nil {
		// found ok
		return nil
	}
	if err != ErrNotFound {
		// Unexpected error
		return err
	}

	// so we got ErrNotFound so GetDetails from a detailer
	err = s.Show.GetDetails(log)
	if err != nil {
		return err
	}

	s.Episodes = []*Episode{}
	for _, pe := range s.Show.Episodes {
		s.Episodes = append(s.Episodes, NewEpisodeFromPolochon(pe))
	}
	s.Add(db)
	return nil
}

// GetDetailsAsUser like GetDetails but with User context
func (s *Show) GetDetailsAsUser(db *sqlx.DB, user *users.User, log *logrus.Entry) error {
	var err error
	err = s.GetAsUser(db, user)
	if err == nil {
		// found ok
		return nil
	}
	if err != ErrNotFound {
		// Unexpected error
		return err
	}
	err = s.Show.GetDetails(log)
	if err != nil {
		return err
	}
	s.Add(db)
	s.Episodes = []*Episode{}
	for _, pe := range s.Show.Episodes {
		s.Episodes = append(s.Episodes, NewEpisodeFromPolochon(pe))
	}
	return nil
}

// IsTracked returns true if the show is tracked use this function
// after retrieve the show with GetAsUser or other *AsUser functions
func (s *Show) IsTracked() bool {
	if s.TrackedSeason != 0 && s.TrackedEpisode != 0 {
		return true
	}
	return false
}

func (s *Show) Add(db *sqlx.DB) error {
	var id string
	r, err := db.NamedQuery(addShowQuery, s)
	if err != nil {
		return err
	}
	for r.Next() {
		r.Scan(&id)
	}
	s.ID = id

	// When add a show to database use polochon episode details
	// so s.Show.Episodes
	for _, pEp := range s.Show.Episodes {
		err = s.addEpisode(db, pEp)
		if err != nil {
			return err
		}
	}
	return nil
}

func (s *Show) addEpisode(db *sqlx.DB, pEpisode *polochon.ShowEpisode) error {
	_, err := db.Exec(addEpisodeQuery, s.ID, pEpisode.Title, pEpisode.Season, pEpisode.Episode)
	if err != nil {
		return err
	}
	return nil
}

func (s *Show) Delete(db *sqlx.DB) error {
	r, err := db.Exec(deleteShowQuery, s.ID)
	if err != nil {
		return err
	}
	count, _ := r.RowsAffected()
	if count != 1 {
		return fmt.Errorf("Unexpected number of row deleted: %d", count)
	}
	return nil
}

func (s *Show) GetEpisodes(db *sqlx.DB) error {
	// When retrive episode's info from database populate the s.Episodes member
	// and not s.Show.Episodes
	err := db.Select(&s.Episodes, getEpisodesQuery, s.ID)
	if err != nil {
		return err
	}

	return nil
}

type Episode struct {
	sqly.BaseTable
	polochon.ShowEpisode
}

// NewEpisodeFromPolochon returns a new episode from a polochon.ShowEpisode
func NewEpisodeFromPolochon(pe *polochon.ShowEpisode) *Episode {
	e := &Episode{}
	e.Title = pe.Title
	e.ShowTitle = pe.ShowTitle
	e.Season = pe.Season
	e.Episode = pe.Episode
	e.TvdbID = pe.TvdbID
	e.Aired = pe.Aired
	e.Plot = pe.Plot
	e.Runtime = pe.Runtime
	e.Rating = pe.Rating
	e.ShowImdbID = pe.ShowImdbID
	e.ShowTvdbID = pe.ShowTvdbID
	e.EpisodeImdbID = pe.EpisodeImdbID
	return e
}