package query

import (
	"time"

	"github.com/jinzhu/gorm"
	"github.com/photoprism/photoprism/internal/entity"
)

// PhotoByID returns a Photo based on the ID.
func PhotoByID(photoID uint64) (photo entity.Photo, err error) {
	if err := UnscopedDb().Where("id = ?", photoID).
		Preload("Labels", func(db *gorm.DB) *gorm.DB {
			return db.Order("photos_labels.uncertainty ASC, photos_labels.label_id DESC")
		}).
		Preload("Labels.Label").
		Preload("Camera").
		Preload("Lens").
		Preload("Details").
		Preload("Place").
		Preload("Cell").
		Preload("Cell.Place").
		First(&photo).Error; err != nil {
		return photo, err
	}

	return photo, nil
}

// PhotoByUID returns a Photo based on the UID.
func PhotoByUID(photoUID string) (photo entity.Photo, err error) {
	if err := UnscopedDb().Where("photo_uid = ?", photoUID).
		Preload("Labels", func(db *gorm.DB) *gorm.DB {
			return db.Order("photos_labels.uncertainty ASC, photos_labels.label_id DESC")
		}).
		Preload("Labels.Label").
		Preload("Camera").
		Preload("Lens").
		Preload("Details").
		Preload("Place").
		Preload("Cell").
		Preload("Cell.Place").
		First(&photo).Error; err != nil {
		return photo, err
	}

	return photo, nil
}

// PhotoPreloadByUID returns a Photo based on the UID with all dependencies preloaded.
func PhotoPreloadByUID(photoUID string) (photo entity.Photo, err error) {
	if err := UnscopedDb().Where("photo_uid = ?", photoUID).
		Preload("Labels", func(db *gorm.DB) *gorm.DB {
			return db.Order("photos_labels.uncertainty ASC, photos_labels.label_id DESC")
		}).
		Preload("Labels.Label").
		Preload("Camera").
		Preload("Lens").
		Preload("Details").
		Preload("Place").
		Preload("Cell").
		Preload("Cell.Place").
		First(&photo).Error; err != nil {
		return photo, err
	}

	photo.PreloadMany()

	return photo, nil
}

// PhotosMissing returns photo entities without existing files.
func PhotosMissing(limit int, offset int) (entities entity.Photos, err error) {
	err = Db().
		Select("photos.*").
		Joins("JOIN files a ON photos.id = a.photo_id ").
		Joins("LEFT JOIN files b ON a.photo_id = b.photo_id AND a.id != b.id AND b.file_missing = 0 AND b.file_root = '/'").
		Where("a.file_missing = 1 AND b.id IS NULL").
		Where("photos.photo_type <> ?", entity.TypeText).
		Group("photos.id").
		Limit(limit).Offset(offset).Find(&entities).Error

	return entities, err
}

// ResetPhotoQuality resets the quality of photos without primary file to -1.
func ResetPhotoQuality() error {
	return Db().Table("photos").
		Where("id IN (SELECT id FROM (SELECT photos.id FROM photos LEFT JOIN files ON photos.id = files.photo_id AND files.file_primary = 1 WHERE files.id IS NULL GROUP BY photos.id) AS tmp)").
		Update("photo_quality", -1).Error
}

// PhotosCheck returns photos selected for maintenance.
func PhotosCheck(limit int, offset int) (entities entity.Photos, err error) {
	err = Db().
		Preload("Labels", func(db *gorm.DB) *gorm.DB {
			return db.Order("photos_labels.uncertainty ASC, photos_labels.label_id DESC")
		}).
		Preload("Labels.Label").
		Preload("Camera").
		Preload("Lens").
		Preload("Details").
		Preload("Place").
		Preload("Cell").
		Preload("Cell.Place").
		Where("checked_at IS NULL OR checked_at < ?", time.Now().Add(-1*time.Hour*24*3)).
		Where("updated_at < ? OR (cell_id = 'zz' AND photo_lat <> 0)", time.Now().Add(-1*time.Minute*10)).
		Limit(limit).Offset(offset).Find(&entities).Error

	return entities, err
}

// MatchingPhotos returns photos sharing the same exact time and location, or unique image id.
func MatchingPhotos(meta, uuid bool) (entities entity.Photos, err error) {
	if !meta && !uuid {
		return entities, nil
	}

	stmt := UnscopedDb().Table("photos").
		Select("photos.*")

	switch {
	case meta && uuid:
		stmt = stmt.Joins(`JOIN photos dup ON photos.id < dup.id
				AND photos.photo_single = 0 AND dup.photo_single = 0
				AND photos.deleted_at IS NULL AND dup.deleted_at IS NULL
				AND ((photos.taken_src = 'meta' AND dup.taken_src = 'meta' 
				AND photos.photo_lat = dup.photo_lat 
				AND photos.photo_lng = dup.photo_lng 
				AND photos.taken_at = dup.taken_at 
				AND photos.camera_id = dup.camera_id
				AND photos.camera_serial = dup.camera_serial) OR
				(photos.uuid <> '' AND photos.uuid = dup.uuid))`)
	case meta:
		stmt = stmt.Joins(`JOIN photos dup ON photos.id < dup.id
				AND photos.photo_single = 0 
				AND dup.photo_single = 0 
				AND photos.deleted_at IS NULL AND dup.deleted_at IS NULL
				AND ((photos.taken_src = 'meta' AND dup.taken_src = 'meta' 
				AND photos.photo_lat = dup.photo_lat 
				AND photos.photo_lng = dup.photo_lng 
				AND photos.taken_at = dup.taken_at 
				AND photos.camera_id = dup.camera_id
				AND photos.camera_serial = dup.camera_serial))`)
	case uuid:
		stmt = stmt.Joins(`JOIN photos dup ON photos.id < dup.id
				AND photos.photo_single = 0	AND dup.photo_single = 0
				AND photos.deleted_at IS NULL AND dup.deleted_at IS NULL
				AND (photos.uuid <> '' AND photos.uuid = dup.uuid)`)
	}

	err = stmt.Group("photos.id").Find(&entities).Error

	return entities, err
}