package ui

import (
	"context"
	"time"

	"github.com/rivo/tview"

	"git.stinnesbeck.com/nils/arr-tui/internal/arr"
	"git.stinnesbeck.com/nils/arr-tui/internal/radarr"
	"git.stinnesbeck.com/nils/arr-tui/internal/sonarr"
	"git.stinnesbeck.com/nils/arr-tui/internal/trakt"
)

// result is one search hit, independent of which *arr produced it.
type result interface {
	key() string // stable identity, e.g. "tmdb:603"
	title() string
	label() string
	details() detailText
	inLibrary() bool
	withID(id int) result // copy flagged as added to the library
	cover() coverRef
}

// monitorMode is a Sonarr-style "which episodes to monitor" choice.
type monitorMode struct {
	label string
	value string
}

// addChoice is what the add dialog collects.
type addChoice struct {
	profileID int
	folder    string
	monitored bool
	searchNow bool
	monitor   string // empty for backends without monitor modes
}

// backend adapts Radarr or Sonarr to the generic search view.
type backend interface {
	name() string // "Radarr"
	noun() string // "Movies"
	arr() *arr.Client
	search(ctx context.Context, term string) ([]result, error)
	monitorModes() []monitorMode // nil if not applicable
	add(ctx context.Context, r result, c addChoice) (id int, err error)
	// interactive starts an interactive release search for a library item.
	interactive(v *searchView, r result)
	// lists are the Trakt lists offered while the search box is empty, and
	// resolve looks a list entry up (nil without error if it is not found).
	lists() []trakt.List
	resolve(ctx context.Context, e trakt.Entry) (result, error)
}

// --- Radarr ---

type movieResult struct {
	radarr.Movie
	poster coverRef
}

func (m movieResult) key() string         { return radarr.TMDBTerm(m.TMDBID) }
func (m movieResult) title() string       { return m.Title }
func (m movieResult) label() string       { return movieLabel(m.Movie) }
func (m movieResult) details() detailText { return movieDetails(m.Movie) }
func (m movieResult) inLibrary() bool     { return m.InLibrary() }
func (m movieResult) cover() coverRef     { return m.poster }
func (m movieResult) withID(id int) result {
	m.ID = id
	return m
}

type radarrBackend struct{ c *radarr.Client }

func (b radarrBackend) name() string              { return "Radarr" }
func (b radarrBackend) noun() string              { return "Movies" }
func (b radarrBackend) arr() *arr.Client          { return b.c.Client }
func (radarrBackend) monitorModes() []monitorMode { return nil }

func (b radarrBackend) search(ctx context.Context, term string) ([]result, error) {
	movies, err := b.c.Lookup(ctx, term)
	out := make([]result, len(movies))
	for i, m := range movies {
		out[i] = movieResult{Movie: m, poster: coverFor(b.c.Client, m.Images, m.InLibrary())}
	}
	return out, err
}

func (radarrBackend) lists() []trakt.List { return trakt.MovieLists }

func (b radarrBackend) resolve(ctx context.Context, e trakt.Entry) (result, error) {
	if e.IDs.TMDB == 0 {
		return nil, errNotListed
	}
	found, err := b.search(ctx, radarr.TMDBTerm(e.IDs.TMDB))
	if err != nil || len(found) == 0 {
		return nil, err
	}
	return found[0], nil
}

func (b radarrBackend) add(ctx context.Context, r result, c addChoice) (int, error) {
	created, err := b.c.AddMovie(ctx, r.(movieResult).Movie, radarr.AddOptions{
		QualityProfileID: c.profileID,
		RootFolderPath:   c.folder,
		Monitored:        c.monitored,
		SearchNow:        c.searchNow,
	})
	return created.ID, err
}

func (b radarrBackend) interactive(v *searchView, r result) {
	m := r.(movieResult)
	v.app.openReleases("Releases for "+tview.Escape(movieTitleYear(m.Movie)),
		func(ctx context.Context) ([]arr.Release, error) { return b.c.Releases(ctx, m.ID) },
		b.c.Grab)
}

// --- Sonarr ---

type seriesResult struct {
	sonarr.Series
	poster coverRef
}

func (s seriesResult) key() string         { return "tvdb:" + itoa(s.TVDBID) }
func (s seriesResult) title() string       { return s.Title }
func (s seriesResult) label() string       { return seriesLabel(s.Series) }
func (s seriesResult) details() detailText { return seriesDetails(s.Series) }
func (s seriesResult) inLibrary() bool     { return s.InLibrary() }
func (s seriesResult) cover() coverRef     { return s.poster }
func (s seriesResult) withID(id int) result {
	s.ID = id
	return s
}

type sonarrBackend struct{ c *sonarr.Client }

func (b sonarrBackend) name() string     { return "Sonarr" }
func (b sonarrBackend) noun() string     { return "Series" }
func (b sonarrBackend) arr() *arr.Client { return b.c.Client }

func (sonarrBackend) monitorModes() []monitorMode {
	return []monitorMode{
		{"All episodes", sonarr.MonitorAll},
		{"Future episodes", sonarr.MonitorFuture},
		{"Missing episodes", sonarr.MonitorMissing},
		{"First season", sonarr.MonitorFirstSeason},
		{"Latest season", sonarr.MonitorLatestSeason},
		{"None", sonarr.MonitorNone},
	}
}

func (b sonarrBackend) search(ctx context.Context, term string) ([]result, error) {
	series, err := b.c.Lookup(ctx, term)
	out := make([]result, len(series))
	for i, s := range series {
		out[i] = seriesResult{Series: s, poster: coverFor(b.c.Client, s.Images, s.InLibrary())}
	}
	return out, err
}

func (sonarrBackend) lists() []trakt.List { return trakt.ShowLists }

func (b sonarrBackend) resolve(ctx context.Context, e trakt.Entry) (result, error) {
	if e.IDs.TVDB == 0 {
		return nil, errNotListed
	}
	found, err := b.search(ctx, "tvdb:"+itoa(e.IDs.TVDB))
	if err != nil || len(found) == 0 {
		return nil, err
	}
	return found[0], nil
}

func (b sonarrBackend) add(ctx context.Context, r result, c addChoice) (int, error) {
	created, err := b.c.AddSeries(ctx, r.(seriesResult).Series, sonarr.AddOptions{
		QualityProfileID: c.profileID,
		RootFolderPath:   c.folder,
		Monitored:        c.monitored,
		Monitor:          c.monitor,
		SearchNow:        c.searchNow,
	})
	return created.ID, err
}

func (b sonarrBackend) interactive(v *searchView, r result) {
	s := r.(seriesResult)
	v.app.SetMessage("Loading episodes…")
	go func() {
		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		defer cancel()
		episodes, err := b.c.Episodes(ctx, s.ID)
		v.app.post(func() {
			if err != nil {
				v.app.SetMessage("[red]Loading episodes failed: " + tview.Escape(err.Error()))
				return
			}
			v.app.SetMessage("")
			v.app.pickSeason(b.c, s.Series, episodes)
		})
	}()
}