package api

import (
	"context"
	"database/sql"
	"fmt"
	"strconv"
	"time"

	"github.com/stashapp/stash/pkg/manager"
	"github.com/stashapp/stash/pkg/manager/config"
	"github.com/stashapp/stash/pkg/models"
	"github.com/stashapp/stash/pkg/utils"
)

func (r *mutationResolver) SceneUpdate(ctx context.Context, input models.SceneUpdateInput) (ret *models.Scene, err error) {
	translator := changesetTranslator{
		inputMap: getUpdateInputMap(ctx),
	}

	// Start the transaction and save the scene
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		ret, err = r.sceneUpdate(input, translator, repo)
		return err
	}); err != nil {
		return nil, err
	}

	return ret, nil
}

func (r *mutationResolver) ScenesUpdate(ctx context.Context, input []*models.SceneUpdateInput) (ret []*models.Scene, err error) {
	inputMaps := getUpdateInputMaps(ctx)

	// Start the transaction and save the scene
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		for i, scene := range input {
			translator := changesetTranslator{
				inputMap: inputMaps[i],
			}

			thisScene, err := r.sceneUpdate(*scene, translator, repo)
			ret = append(ret, thisScene)

			if err != nil {
				return err
			}
		}

		return nil
	}); err != nil {
		return nil, err
	}

	return ret, nil
}

func (r *mutationResolver) sceneUpdate(input models.SceneUpdateInput, translator changesetTranslator, repo models.Repository) (*models.Scene, error) {
	// Populate scene from the input
	sceneID, err := strconv.Atoi(input.ID)
	if err != nil {
		return nil, err
	}

	var coverImageData []byte

	updatedTime := time.Now()
	updatedScene := models.ScenePartial{
		ID:        sceneID,
		UpdatedAt: &models.SQLiteTimestamp{Timestamp: updatedTime},
	}

	updatedScene.Title = translator.nullString(input.Title, "title")
	updatedScene.Details = translator.nullString(input.Details, "details")
	updatedScene.URL = translator.nullString(input.URL, "url")
	updatedScene.Date = translator.sqliteDate(input.Date, "date")
	updatedScene.Rating = translator.nullInt64(input.Rating, "rating")
	updatedScene.StudioID = translator.nullInt64FromString(input.StudioID, "studio_id")
	updatedScene.Organized = input.Organized

	if input.CoverImage != nil && *input.CoverImage != "" {
		var err error
		coverImageData, err = utils.ProcessImageInput(*input.CoverImage)
		if err != nil {
			return nil, err
		}

		// update the cover after updating the scene
	}

	qb := repo.Scene()
	scene, err := qb.Update(updatedScene)
	if err != nil {
		return nil, err
	}

	// update cover table
	if len(coverImageData) > 0 {
		if err := qb.UpdateCover(sceneID, coverImageData); err != nil {
			return nil, err
		}
	}

	// Save the performers
	if translator.hasField("performer_ids") {
		if err := r.updateScenePerformers(qb, sceneID, input.PerformerIds); err != nil {
			return nil, err
		}
	}

	// Save the movies
	if translator.hasField("movies") {
		if err := r.updateSceneMovies(qb, sceneID, input.Movies); err != nil {
			return nil, err
		}
	}

	// Save the tags
	if translator.hasField("tag_ids") {
		if err := r.updateSceneTags(qb, sceneID, input.TagIds); err != nil {
			return nil, err
		}
	}

	// Save the galleries
	if translator.hasField("gallery_ids") {
		if err := r.updateSceneGalleries(qb, sceneID, input.GalleryIds); err != nil {
			return nil, err
		}
	}

	// Save the stash_ids
	if translator.hasField("stash_ids") {
		stashIDJoins := models.StashIDsFromInput(input.StashIds)
		if err := qb.UpdateStashIDs(sceneID, stashIDJoins); err != nil {
			return nil, err
		}
	}

	// only update the cover image if provided and everything else was successful
	if coverImageData != nil {
		err = manager.SetSceneScreenshot(scene.GetHash(config.GetInstance().GetVideoFileNamingAlgorithm()), coverImageData)
		if err != nil {
			return nil, err
		}
	}

	return scene, nil
}

func (r *mutationResolver) updateScenePerformers(qb models.SceneReaderWriter, sceneID int, performerIDs []string) error {
	ids, err := utils.StringSliceToIntSlice(performerIDs)
	if err != nil {
		return err
	}
	return qb.UpdatePerformers(sceneID, ids)
}

func (r *mutationResolver) updateSceneMovies(qb models.SceneReaderWriter, sceneID int, movies []*models.SceneMovieInput) error {
	var movieJoins []models.MoviesScenes

	for _, movie := range movies {
		movieID, err := strconv.Atoi(movie.MovieID)
		if err != nil {
			return err
		}

		movieJoin := models.MoviesScenes{
			MovieID: movieID,
		}

		if movie.SceneIndex != nil {
			movieJoin.SceneIndex = sql.NullInt64{
				Int64: int64(*movie.SceneIndex),
				Valid: true,
			}
		}

		movieJoins = append(movieJoins, movieJoin)
	}

	return qb.UpdateMovies(sceneID, movieJoins)
}

func (r *mutationResolver) updateSceneTags(qb models.SceneReaderWriter, sceneID int, tagsIDs []string) error {
	ids, err := utils.StringSliceToIntSlice(tagsIDs)
	if err != nil {
		return err
	}
	return qb.UpdateTags(sceneID, ids)
}

func (r *mutationResolver) updateSceneGalleries(qb models.SceneReaderWriter, sceneID int, galleryIDs []string) error {
	ids, err := utils.StringSliceToIntSlice(galleryIDs)
	if err != nil {
		return err
	}
	return qb.UpdateGalleries(sceneID, ids)
}

func (r *mutationResolver) BulkSceneUpdate(ctx context.Context, input models.BulkSceneUpdateInput) ([]*models.Scene, error) {
	sceneIDs, err := utils.StringSliceToIntSlice(input.Ids)
	if err != nil {
		return nil, err
	}

	// Populate scene from the input
	updatedTime := time.Now()

	translator := changesetTranslator{
		inputMap: getUpdateInputMap(ctx),
	}

	updatedScene := models.ScenePartial{
		UpdatedAt: &models.SQLiteTimestamp{Timestamp: updatedTime},
	}

	updatedScene.Title = translator.nullString(input.Title, "title")
	updatedScene.Details = translator.nullString(input.Details, "details")
	updatedScene.URL = translator.nullString(input.URL, "url")
	updatedScene.Date = translator.sqliteDate(input.Date, "date")
	updatedScene.Rating = translator.nullInt64(input.Rating, "rating")
	updatedScene.StudioID = translator.nullInt64FromString(input.StudioID, "studio_id")
	updatedScene.Organized = input.Organized

	ret := []*models.Scene{}

	// Start the transaction and save the scene marker
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()

		for _, sceneID := range sceneIDs {
			updatedScene.ID = sceneID

			scene, err := qb.Update(updatedScene)
			if err != nil {
				return err
			}

			ret = append(ret, scene)

			// Save the performers
			if translator.hasField("performer_ids") {
				performerIDs, err := adjustScenePerformerIDs(qb, sceneID, *input.PerformerIds)
				if err != nil {
					return err
				}

				if err := qb.UpdatePerformers(sceneID, performerIDs); err != nil {
					return err
				}
			}

			// Save the tags
			if translator.hasField("tag_ids") {
				tagIDs, err := adjustTagIDs(qb, sceneID, *input.TagIds)
				if err != nil {
					return err
				}

				if err := qb.UpdateTags(sceneID, tagIDs); err != nil {
					return err
				}
			}

			// Save the galleries
			if translator.hasField("gallery_ids") {
				galleryIDs, err := adjustSceneGalleryIDs(qb, sceneID, *input.GalleryIds)
				if err != nil {
					return err
				}

				if err := qb.UpdateGalleries(sceneID, galleryIDs); err != nil {
					return err
				}
			}
		}

		return nil
	}); err != nil {
		return nil, err
	}

	return ret, nil
}

func adjustIDs(existingIDs []int, updateIDs models.BulkUpdateIds) []int {
	// if we are setting the ids, just return the ids
	if updateIDs.Mode == models.BulkUpdateIDModeSet {
		existingIDs = []int{}
		for _, idStr := range updateIDs.Ids {
			id, _ := strconv.Atoi(idStr)
			existingIDs = append(existingIDs, id)
		}

		return existingIDs
	}

	for _, idStr := range updateIDs.Ids {
		id, _ := strconv.Atoi(idStr)

		// look for the id in the list
		foundExisting := false
		for idx, existingID := range existingIDs {
			if existingID == id {
				if updateIDs.Mode == models.BulkUpdateIDModeRemove {
					// remove from the list
					existingIDs = append(existingIDs[:idx], existingIDs[idx+1:]...)
				}

				foundExisting = true
				break
			}
		}

		if !foundExisting && updateIDs.Mode != models.BulkUpdateIDModeRemove {
			existingIDs = append(existingIDs, id)
		}
	}

	return existingIDs
}

func adjustScenePerformerIDs(qb models.SceneReader, sceneID int, ids models.BulkUpdateIds) (ret []int, err error) {
	ret, err = qb.GetPerformerIDs(sceneID)
	if err != nil {
		return nil, err
	}

	return adjustIDs(ret, ids), nil
}

type tagIDsGetter interface {
	GetTagIDs(id int) ([]int, error)
}

func adjustTagIDs(qb tagIDsGetter, sceneID int, ids models.BulkUpdateIds) (ret []int, err error) {
	ret, err = qb.GetTagIDs(sceneID)
	if err != nil {
		return nil, err
	}

	return adjustIDs(ret, ids), nil
}

func adjustSceneGalleryIDs(qb models.SceneReader, sceneID int, ids models.BulkUpdateIds) (ret []int, err error) {
	ret, err = qb.GetGalleryIDs(sceneID)
	if err != nil {
		return nil, err
	}

	return adjustIDs(ret, ids), nil
}

func (r *mutationResolver) SceneDestroy(ctx context.Context, input models.SceneDestroyInput) (bool, error) {
	sceneID, err := strconv.Atoi(input.ID)
	if err != nil {
		return false, err
	}

	var scene *models.Scene
	var postCommitFunc func()
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()
		var err error
		scene, err = qb.Find(sceneID)
		if err != nil {
			return err
		}

		if scene == nil {
			return fmt.Errorf("scene with id %d not found", sceneID)
		}

		postCommitFunc, err = manager.DestroyScene(scene, repo)
		return err
	}); err != nil {
		return false, err
	}

	// perform the post-commit actions
	postCommitFunc()

	// if delete generated is true, then delete the generated files
	// for the scene
	if input.DeleteGenerated != nil && *input.DeleteGenerated {
		manager.DeleteGeneratedSceneFiles(scene, config.GetInstance().GetVideoFileNamingAlgorithm())
	}

	// if delete file is true, then delete the file as well
	// if it fails, just log a message
	if input.DeleteFile != nil && *input.DeleteFile {
		manager.DeleteSceneFile(scene)
	}

	return true, nil
}

func (r *mutationResolver) ScenesDestroy(ctx context.Context, input models.ScenesDestroyInput) (bool, error) {
	var scenes []*models.Scene
	var postCommitFuncs []func()
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()

		for _, id := range input.Ids {
			sceneID, _ := strconv.Atoi(id)

			scene, err := qb.Find(sceneID)
			if err != nil {
				return err
			}
			if scene != nil {
				scenes = append(scenes, scene)
			}
			f, err := manager.DestroyScene(scene, repo)
			if err != nil {
				return err
			}

			postCommitFuncs = append(postCommitFuncs, f)
		}

		return nil
	}); err != nil {
		return false, err
	}

	for _, f := range postCommitFuncs {
		f()
	}

	fileNamingAlgo := config.GetInstance().GetVideoFileNamingAlgorithm()
	for _, scene := range scenes {
		// if delete generated is true, then delete the generated files
		// for the scene
		if input.DeleteGenerated != nil && *input.DeleteGenerated {
			manager.DeleteGeneratedSceneFiles(scene, fileNamingAlgo)
		}

		// if delete file is true, then delete the file as well
		// if it fails, just log a message
		if input.DeleteFile != nil && *input.DeleteFile {
			manager.DeleteSceneFile(scene)
		}
	}

	return true, nil
}

func (r *mutationResolver) SceneMarkerCreate(ctx context.Context, input models.SceneMarkerCreateInput) (*models.SceneMarker, error) {
	primaryTagID, err := strconv.Atoi(input.PrimaryTagID)
	if err != nil {
		return nil, err
	}

	sceneID, err := strconv.Atoi(input.SceneID)
	if err != nil {
		return nil, err
	}

	currentTime := time.Now()
	newSceneMarker := models.SceneMarker{
		Title:        input.Title,
		Seconds:      input.Seconds,
		PrimaryTagID: primaryTagID,
		SceneID:      sql.NullInt64{Int64: int64(sceneID), Valid: sceneID != 0},
		CreatedAt:    models.SQLiteTimestamp{Timestamp: currentTime},
		UpdatedAt:    models.SQLiteTimestamp{Timestamp: currentTime},
	}

	tagIDs, err := utils.StringSliceToIntSlice(input.TagIds)
	if err != nil {
		return nil, err
	}

	return r.changeMarker(ctx, create, newSceneMarker, tagIDs)
}

func (r *mutationResolver) SceneMarkerUpdate(ctx context.Context, input models.SceneMarkerUpdateInput) (*models.SceneMarker, error) {
	// Populate scene marker from the input
	sceneMarkerID, err := strconv.Atoi(input.ID)
	if err != nil {
		return nil, err
	}

	primaryTagID, err := strconv.Atoi(input.PrimaryTagID)
	if err != nil {
		return nil, err
	}

	sceneID, err := strconv.Atoi(input.SceneID)
	if err != nil {
		return nil, err
	}

	updatedSceneMarker := models.SceneMarker{
		ID:           sceneMarkerID,
		Title:        input.Title,
		Seconds:      input.Seconds,
		SceneID:      sql.NullInt64{Int64: int64(sceneID), Valid: sceneID != 0},
		PrimaryTagID: primaryTagID,
		UpdatedAt:    models.SQLiteTimestamp{Timestamp: time.Now()},
	}

	tagIDs, err := utils.StringSliceToIntSlice(input.TagIds)
	if err != nil {
		return nil, err
	}

	return r.changeMarker(ctx, update, updatedSceneMarker, tagIDs)
}

func (r *mutationResolver) SceneMarkerDestroy(ctx context.Context, id string) (bool, error) {
	markerID, err := strconv.Atoi(id)
	if err != nil {
		return false, err
	}

	var postCommitFunc func()
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.SceneMarker()
		sqb := repo.Scene()

		marker, err := qb.Find(markerID)

		if err != nil {
			return err
		}

		if marker == nil {
			return fmt.Errorf("scene marker with id %d not found", markerID)
		}

		scene, err := sqb.Find(int(marker.SceneID.Int64))
		if err != nil {
			return err
		}

		postCommitFunc, err = manager.DestroySceneMarker(scene, marker, qb)
		return err
	}); err != nil {
		return false, err
	}

	postCommitFunc()

	return true, nil
}

func (r *mutationResolver) changeMarker(ctx context.Context, changeType int, changedMarker models.SceneMarker, tagIDs []int) (*models.SceneMarker, error) {
	var existingMarker *models.SceneMarker
	var sceneMarker *models.SceneMarker
	var scene *models.Scene

	// Start the transaction and save the scene marker
	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.SceneMarker()
		sqb := repo.Scene()

		var err error
		switch changeType {
		case create:
			sceneMarker, err = qb.Create(changedMarker)
		case update:
			// check to see if timestamp was changed
			existingMarker, err = qb.Find(changedMarker.ID)
			if err != nil {
				return err
			}
			sceneMarker, err = qb.Update(changedMarker)
			if err != nil {
				return err
			}

			scene, err = sqb.Find(int(existingMarker.SceneID.Int64))
		}
		if err != nil {
			return err
		}

		// Save the marker tags
		// If this tag is the primary tag, then let's not add it.
		tagIDs = utils.IntExclude(tagIDs, []int{changedMarker.PrimaryTagID})
		return qb.UpdateTags(sceneMarker.ID, tagIDs)
	}); err != nil {
		return nil, err
	}

	// remove the marker preview if the timestamp was changed
	if scene != nil && existingMarker != nil && existingMarker.Seconds != changedMarker.Seconds {
		seconds := int(existingMarker.Seconds)
		manager.DeleteSceneMarkerFiles(scene, seconds, config.GetInstance().GetVideoFileNamingAlgorithm())
	}

	return sceneMarker, nil
}

func (r *mutationResolver) SceneIncrementO(ctx context.Context, id string) (ret int, err error) {
	sceneID, err := strconv.Atoi(id)
	if err != nil {
		return 0, err
	}

	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()

		ret, err = qb.IncrementOCounter(sceneID)
		return err
	}); err != nil {
		return 0, err
	}

	return ret, nil
}

func (r *mutationResolver) SceneDecrementO(ctx context.Context, id string) (ret int, err error) {
	sceneID, err := strconv.Atoi(id)
	if err != nil {
		return 0, err
	}

	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()

		ret, err = qb.DecrementOCounter(sceneID)
		return err
	}); err != nil {
		return 0, err
	}

	return ret, nil
}

func (r *mutationResolver) SceneResetO(ctx context.Context, id string) (ret int, err error) {
	sceneID, err := strconv.Atoi(id)
	if err != nil {
		return 0, err
	}

	if err := r.withTxn(ctx, func(repo models.Repository) error {
		qb := repo.Scene()

		ret, err = qb.ResetOCounter(sceneID)
		return err
	}); err != nil {
		return 0, err
	}

	return ret, nil
}

func (r *mutationResolver) SceneGenerateScreenshot(ctx context.Context, id string, at *float64) (string, error) {
	if at != nil {
		manager.GetInstance().GenerateScreenshot(id, *at)
	} else {
		manager.GetInstance().GenerateDefaultScreenshot(id)
	}

	return "todo", nil
}