package persistence

import (
	domain "RenewCMS/internal/domain/image"
	"RenewCMS/internal/infrastructure/persistence/mappers"
	entity "RenewCMS/internal/infrastructure/persistence/models"
	"strings"

	"gorm.io/gorm"
)

type ImageRepository struct {
	db *gorm.DB
}

func NewImageRepository(db *gorm.DB) *ImageRepository {
	return &ImageRepository{db}
}

func (i ImageRepository) Create(image domain.Image) (domain.Image, error) {
	model := mappers.ImageToModel(image)
	if err := i.db.Create(&model).Error; err != nil {
		return domain.Image{}, err
	}
	return mappers.ImageToDomain(model), nil
}

func (i ImageRepository) Get(id uint32) (domain.Image, error) {
	var model entity.Image
	err := i.db.First(&model, id).Error
	if err != nil {
		return domain.Image{}, mapNotFoundErr(err, domain.ErrImageNotFound)
	}
	return mappers.ImageToDomain(model), nil
}

func (i ImageRepository) Delete(id uint32) error {
	return deleteOrNotFound(i.db.Delete(&entity.Image{}, id), domain.ErrImageNotFound)
}

func (i ImageRepository) List(query domain.SearchQuery) ([]domain.Image, error) {
	statement := i.db.Model(&entity.Image{})
	if query.Search != "" {
		statement = statement.Where("LOWER(filename) LIKE ? ESCAPE '!'", containsPattern(strings.ToLower(query.Search)))
	}
	if query.Hash != "" {
		statement = statement.Where("sha256 = ?", query.Hash)
	}

	var models []entity.Image
	if err := statement.Order("id asc").Find(&models).Error; err != nil {
		return nil, err
	}
	return imagesToDomain(models), nil
}

func (i ImageRepository) FindByHash(hash string) ([]domain.Image, error) {
	if hash == "" {
		return []domain.Image{}, nil
	}
	var models []entity.Image
	if err := i.db.Where("sha256 = ?", hash).Order("id asc").Find(&models).Error; err != nil {
		return nil, err
	}
	return imagesToDomain(models), nil
}

func (i ImageRepository) Rename(id uint32, filename string) (domain.Image, error) {
	var model entity.Image
	err := i.db.First(&model, id).Error
	if err != nil {
		return domain.Image{}, mapNotFoundErr(err, domain.ErrImageNotFound)
	}

	model.Filename = filename
	if err := i.db.Save(&model).Error; err != nil {
		return domain.Image{}, err
	}
	return mappers.ImageToDomain(model), nil
}

func (i ImageRepository) ListDuplicates() ([]domain.Image, error) {
	var models []entity.Image
	err := i.db.Where("sha256 IN (?)", i.duplicatedHashes()).Order("sha256 asc, id asc").Find(&models).Error
	if err != nil {
		return nil, err
	}
	return imagesToDomain(models), nil
}

func (i ImageRepository) Counts() (domain.Counts, error) {
	var all int64
	if err := i.db.Model(&entity.Image{}).Count(&all).Error; err != nil {
		return domain.Counts{}, err
	}

	var groups int64
	if err := i.db.Table("(?) as duplicated", i.duplicatedHashes()).Count(&groups).Error; err != nil {
		return domain.Counts{}, err
	}
	return domain.Counts{All: int(all), DuplicateGroups: int(groups)}, nil
}

func (i ImageRepository) ExistsByStoredName(storedName string) (bool, error) {
	var matches int64
	err := i.db.Model(&entity.Image{}).Where("path = ?", domain.PublicPath(storedName)).Limit(1).Count(&matches).Error
	return matches > 0, err
}

func (i ImageRepository) duplicatedHashes() *gorm.DB {
	return i.db.Model(&entity.Image{}).
		Select("sha256").
		Where("sha256 <> ''").
		Group("sha256").
		Having("COUNT(*) > 1")
}

func imagesToDomain(models []entity.Image) []domain.Image {
	images := make([]domain.Image, 0, len(models))
	for _, model := range models {
		images = append(images, mappers.ImageToDomain(model))
	}
	return images
}

func (i ImageRepository) ListMissingMetadata() ([]domain.Image, error) {
	var models []entity.Image
	err := i.db.Where("filename = '' OR filename IS NULL").Order("id asc").Find(&models).Error
	if err != nil {
		return nil, err
	}
	return imagesToDomain(models), nil
}

func (i ImageRepository) UpdateMetadata(id uint32, metadata domain.Metadata) error {
	return i.db.Model(&entity.Image{}).Where("id = ?", id).UpdateColumns(map[string]any{
		"filename":     metadata.Filename,
		"size":         metadata.Size,
		"content_type": metadata.ContentType,
		"width":        metadata.Width,
		"height":       metadata.Height,
		"sha256":       metadata.SHA256,
	}).Error
}

var _ domain.Repository = &ImageRepository{}