package api

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

	"github.com/stashapp/stash/pkg/database"
	"github.com/stashapp/stash/pkg/models"
	"github.com/stashapp/stash/pkg/utils"
)

func (r *mutationResolver) MovieCreate(ctx context.Context, input models.MovieCreateInput) (*models.Movie, error) {
	// generate checksum from movie name rather than image
	checksum := utils.MD5FromString(input.Name)

	var frontimageData []byte
	var backimageData []byte
	var err error

	if input.FrontImage == nil {
		input.FrontImage = &models.DefaultMovieImage
	}
	if input.BackImage == nil {
		input.BackImage = &models.DefaultMovieImage
	}
	// Process the base 64 encoded image string
	_, frontimageData, err = utils.ProcessBase64Image(*input.FrontImage)
	if err != nil {
		return nil, err
	}
	// Process the base 64 encoded image string
	_, backimageData, err = utils.ProcessBase64Image(*input.BackImage)
	if err != nil {
		return nil, err
	}

	// Populate a new movie from the input
	currentTime := time.Now()
	newMovie := models.Movie{
		Checksum:  checksum,
		Name:      sql.NullString{String: input.Name, Valid: true},
		CreatedAt: models.SQLiteTimestamp{Timestamp: currentTime},
		UpdatedAt: models.SQLiteTimestamp{Timestamp: currentTime},
	}

	if input.Aliases != nil {
		newMovie.Aliases = sql.NullString{String: *input.Aliases, Valid: true}
	}
	if input.Duration != nil {
		duration := int64(*input.Duration)
		newMovie.Duration = sql.NullInt64{Int64: duration, Valid: true}
	}

	if input.Date != nil {
		newMovie.Date = models.SQLiteDate{String: *input.Date, Valid: true}
	}

	if input.Rating != nil {
		rating := int64(*input.Rating)
		newMovie.Rating = sql.NullInt64{Int64: rating, Valid: true}
	}

	if input.StudioID != nil {
		studioID, _ := strconv.ParseInt(*input.StudioID, 10, 64)
		newMovie.StudioID = sql.NullInt64{Int64: studioID, Valid: true}
	}

	if input.Director != nil {
		newMovie.Director = sql.NullString{String: *input.Director, Valid: true}
	}

	if input.Synopsis != nil {
		newMovie.Synopsis = sql.NullString{String: *input.Synopsis, Valid: true}
	}

	if input.URL != nil {
		newMovie.URL = sql.NullString{String: *input.URL, Valid: true}
	}

	// Start the transaction and save the movie
	tx := database.DB.MustBeginTx(ctx, nil)
	qb := models.NewMovieQueryBuilder()
	movie, err := qb.Create(newMovie, tx)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}

	// update image table
	if len(frontimageData) > 0 {
		if err := qb.UpdateMovieImages(movie.ID, frontimageData, backimageData, tx); err != nil {
			_ = tx.Rollback()
			return nil, err
		}
	}

	// Commit
	if err := tx.Commit(); err != nil {
		return nil, err
	}

	return movie, nil
}

func (r *mutationResolver) MovieUpdate(ctx context.Context, input models.MovieUpdateInput) (*models.Movie, error) {
	// Populate movie from the input
	movieID, _ := strconv.Atoi(input.ID)

	updatedMovie := models.MoviePartial{
		ID:        movieID,
		UpdatedAt: &models.SQLiteTimestamp{Timestamp: time.Now()},
	}
	var frontimageData []byte
	var err error
	if input.FrontImage != nil {
		_, frontimageData, err = utils.ProcessBase64Image(*input.FrontImage)
		if err != nil {
			return nil, err
		}
	}
	var backimageData []byte
	if input.BackImage != nil {
		_, backimageData, err = utils.ProcessBase64Image(*input.BackImage)
		if err != nil {
			return nil, err
		}
	}

	if input.Name != nil {
		// generate checksum from movie name rather than image
		checksum := utils.MD5FromString(*input.Name)
		updatedMovie.Name = &sql.NullString{String: *input.Name, Valid: true}
		updatedMovie.Checksum = &checksum
	}

	if input.Aliases != nil {
		updatedMovie.Aliases = &sql.NullString{String: *input.Aliases, Valid: true}
	}
	if input.Duration != nil {
		duration := int64(*input.Duration)
		updatedMovie.Duration = &sql.NullInt64{Int64: duration, Valid: true}
	}

	if input.Date != nil {
		updatedMovie.Date = &models.SQLiteDate{String: *input.Date, Valid: true}
	}

	if input.Rating != nil {
		rating := int64(*input.Rating)
		updatedMovie.Rating = &sql.NullInt64{Int64: rating, Valid: true}
	} else {
		// rating must be nullable
		updatedMovie.Rating = &sql.NullInt64{Valid: false}
	}

	if input.StudioID != nil {
		studioID, _ := strconv.ParseInt(*input.StudioID, 10, 64)
		updatedMovie.StudioID = &sql.NullInt64{Int64: studioID, Valid: true}
	} else {
		// studio must be nullable
		updatedMovie.StudioID = &sql.NullInt64{Valid: false}
	}

	if input.Director != nil {
		updatedMovie.Director = &sql.NullString{String: *input.Director, Valid: true}
	}

	if input.Synopsis != nil {
		updatedMovie.Synopsis = &sql.NullString{String: *input.Synopsis, Valid: true}
	}

	if input.URL != nil {
		updatedMovie.URL = &sql.NullString{String: *input.URL, Valid: true}
	}

	// Start the transaction and save the movie
	tx := database.DB.MustBeginTx(ctx, nil)
	qb := models.NewMovieQueryBuilder()
	movie, err := qb.Update(updatedMovie, tx)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}

	// update image table
	if len(frontimageData) > 0 || len(backimageData) > 0 {
		if len(frontimageData) == 0 {
			frontimageData, err = qb.GetFrontImage(updatedMovie.ID, tx)
			if err != nil {
				_ = tx.Rollback()
				return nil, err
			}
		}
		if len(backimageData) == 0 {
			backimageData, err = qb.GetBackImage(updatedMovie.ID, tx)
			if err != nil {
				_ = tx.Rollback()
				return nil, err
			}
		}

		if err := qb.UpdateMovieImages(movie.ID, frontimageData, backimageData, tx); err != nil {
			_ = tx.Rollback()
			return nil, err
		}
	}

	// Commit
	if err := tx.Commit(); err != nil {
		return nil, err
	}

	return movie, nil
}

func (r *mutationResolver) MovieDestroy(ctx context.Context, input models.MovieDestroyInput) (bool, error) {
	qb := models.NewMovieQueryBuilder()
	tx := database.DB.MustBeginTx(ctx, nil)
	if err := qb.Destroy(input.ID, tx); err != nil {
		_ = tx.Rollback()
		return false, err
	}
	if err := tx.Commit(); err != nil {
		return false, err
	}
	return true, nil
}