package feed

import (
	"context"
	"errors"
	"fmt"

	"github.com/autobrr/autobrr/internal/domain"
	"github.com/autobrr/autobrr/internal/release"
	"github.com/autobrr/autobrr/internal/scheduler"
	"github.com/autobrr/autobrr/pkg/torznab"

	"github.com/rs/zerolog/log"
)

type Service interface {
	FindByID(ctx context.Context, id int) (*domain.Feed, error)
	FindByIndexerIdentifier(ctx context.Context, indexer string) (*domain.Feed, error)
	Find(ctx context.Context) ([]domain.Feed, error)
	Store(ctx context.Context, feed *domain.Feed) error
	Update(ctx context.Context, feed *domain.Feed) error
	ToggleEnabled(ctx context.Context, id int, enabled bool) error
	Delete(ctx context.Context, id int) error

	Start() error
}

type feedInstance struct {
	Name              string
	IndexerIdentifier string
	URL               string
	ApiKey            string
	Implementation    string
	CronSchedule      string
}

type service struct {
	jobs map[string]int

	repo       domain.FeedRepo
	cacheRepo  domain.FeedCacheRepo
	releaseSvc release.Service
	scheduler  scheduler.Service
}

func NewService(repo domain.FeedRepo, cacheRepo domain.FeedCacheRepo, releaseSvc release.Service, scheduler scheduler.Service) Service {
	return &service{
		jobs:       map[string]int{},
		repo:       repo,
		cacheRepo:  cacheRepo,
		releaseSvc: releaseSvc,
		scheduler:  scheduler,
	}
}

func (s *service) FindByID(ctx context.Context, id int) (*domain.Feed, error) {
	return s.repo.FindByID(ctx, id)
}

func (s *service) FindByIndexerIdentifier(ctx context.Context, indexer string) (*domain.Feed, error) {
	return s.repo.FindByIndexerIdentifier(ctx, indexer)
}

func (s *service) Find(ctx context.Context) ([]domain.Feed, error) {
	return s.repo.Find(ctx)
}

func (s *service) Store(ctx context.Context, feed *domain.Feed) error {
	return s.repo.Store(ctx, feed)
}

func (s *service) Update(ctx context.Context, feed *domain.Feed) error {
	return s.update(ctx, feed)
}

func (s *service) Delete(ctx context.Context, id int) error {
	return s.delete(ctx, id)
}

func (s *service) ToggleEnabled(ctx context.Context, id int, enabled bool) error {
	return s.toggleEnabled(ctx, id, enabled)
}

func (s *service) update(ctx context.Context, feed *domain.Feed) error {
	if err := s.repo.Update(ctx, feed); err != nil {
		log.Error().Err(err).Msg("feed.Update: error updating feed")
		return err
	}

	if err := s.restartJob(feed); err != nil {
		log.Error().Err(err).Msg("feed.Update: error restarting feed")
		return err
	}

	return nil
}

func (s *service) delete(ctx context.Context, id int) error {
	f, err := s.repo.FindByID(ctx, id)
	if err != nil {
		log.Error().Err(err).Msg("feed.ToggleEnabled: error finding feed")
		return err
	}

	if err := s.stopTorznabJob(f.Indexer); err != nil {
		log.Error().Err(err).Msg("feed.Delete: error stopping torznab job")
		return err
	}

	if err := s.repo.Delete(ctx, id); err != nil {
		log.Error().Err(err).Msg("feed.Delete: error deleting feed")
		return err
	}

	log.Debug().Msgf("feed.Delete: stopping and removing feed: %v", f.Name)

	return nil
}

func (s *service) toggleEnabled(ctx context.Context, id int, enabled bool) error {
	if err := s.repo.ToggleEnabled(ctx, id, enabled); err != nil {
		log.Error().Err(err).Msg("feed.ToggleEnabled: error toggle enabled")
		return err
	}

	f, err := s.repo.FindByID(ctx, id)
	if err != nil {
		log.Error().Err(err).Msg("feed.ToggleEnabled: error finding feed")
		return err
	}

	if !enabled {
		if err := s.stopTorznabJob(f.Indexer); err != nil {
			log.Error().Err(err).Msg("feed.ToggleEnabled: error stopping torznab job")
			return err
		}

		log.Debug().Msgf("feed.ToggleEnabled: stopping feed: %v", f.Name)

		return nil
	}

	if err := s.startJob(*f); err != nil {
		log.Error().Err(err).Msg("feed.ToggleEnabled: error starting torznab job")
		return err
	}

	log.Debug().Msgf("feed.ToggleEnabled: started feed: %v", f.Name)

	return nil
}

func (s *service) Start() error {
	// get all torznab indexer definitions
	feeds, err := s.repo.Find(context.TODO())
	if err != nil {
		log.Error().Err(err).Msg("feed.Start: error getting feeds")
		return err
	}

	for _, i := range feeds {
		if err := s.startJob(i); err != nil {
			log.Error().Err(err).Msg("feed.Start: failed to initialize torznab job")
			continue
		}
	}

	return nil
}

func (s *service) restartJob(f *domain.Feed) error {
	// stop feed
	if err := s.stopTorznabJob(f.Indexer); err != nil {
		log.Error().Err(err).Msg("feed.restartJob: error stopping torznab job")
		return err
	}

	log.Debug().Msgf("feed.restartJob: stopping feed: %v", f.Name)

	if f.Enabled {
		if err := s.startJob(*f); err != nil {
			log.Error().Err(err).Msg("feed.restartJob: error starting torznab job")
			return err
		}

		log.Debug().Msgf("feed.restartJob: restarted feed: %v", f.Name)
	}

	return nil
}

func (s *service) startJob(f domain.Feed) error {
	// get all torznab indexer definitions
	if !f.Enabled {
		return nil
	}

	// get torznab_url from settings
	if f.URL == "" {
		return nil
	}

	// cron schedule to run every X minutes
	schedule := fmt.Sprintf("*/%d * * * *", f.Interval)

	fi := feedInstance{
		Name:              f.Name,
		IndexerIdentifier: f.Indexer,
		Implementation:    f.Type,
		URL:               f.URL,
		ApiKey:            f.ApiKey,
		CronSchedule:      schedule,
	}

	switch fi.Implementation {
	case string(domain.FeedTypeTorznab):
		if err := s.addTorznabJob(fi); err != nil {
			log.Error().Err(err).Msg("feed.startJob: failed to initialize feed")
			return err
		}
		//case "rss":

	}

	return nil
}

func (s *service) addTorznabJob(f feedInstance) error {
	if f.URL == "" {
		return errors.New("torznab feed requires URL")
	}
	if f.CronSchedule == "" {
		f.CronSchedule = "*/15 * * * *"
	}

	// setup logger
	l := log.With().Str("feed_name", f.Name).Logger()

	// setup torznab Client
	c := torznab.NewClient(f.URL, f.ApiKey)

	// create job
	job := &TorznabJob{
		Name:              f.Name,
		IndexerIdentifier: f.IndexerIdentifier,
		Client:            c,
		Log:               l,
		Repo:              s.cacheRepo,
		ReleaseSvc:        s.releaseSvc,
		URL:               f.URL,
	}

	// schedule job
	id, err := s.scheduler.AddJob(job, f.CronSchedule, f.IndexerIdentifier)
	if err != nil {
		return fmt.Errorf("feed.AddTorznabJob: add job failed: %w", err)
	}
	job.JobID = id

	// add to job map
	s.jobs[f.IndexerIdentifier] = id

	log.Debug().Msgf("feed.AddTorznabJob: %v", f.Name)

	return nil
}

func (s *service) stopTorznabJob(indexer string) error {
	// remove job from scheduler
	if err := s.scheduler.RemoveJobByIdentifier(indexer); err != nil {
		return fmt.Errorf("feed.stopTorznabJob: stop job failed: %w", err)
	}

	log.Debug().Msgf("feed.stopTorznabJob: %v", indexer)

	return nil
}