lolibrary/lolibrary

package dao

import (
    "context"

    "cloud.google.com/go/firestore"
    "github.com/lolibrary/lolibrary/libraries/database"
    "github.com/lolibrary/lolibrary/service.brand/domain"
    "github.com/monzo/terrors"
    "google.golang.org/api/iterator"
)

func ReadBrand(ctx context.Context, id string) (*domain.Brand, error) {
    snap, err := brandsByID.Doc(id).Get(ctx)
    if err != nil {
        if database.NotFound(err) {
            return nil, nil
        }

        return nil, terrors.Wrap(err, nil)
    }

    brand := &domain.Brand{}
    if err := snap.DataTo(&brand); err != nil {
        return nil, terrors.Wrap(err, nil)
    }

    return brand, nil
}

func ReadBrandBySlug(ctx context.Context, slug string) (*domain.Brand, error) {
    snap, err := brandsBySlug.Doc(slug).Get(ctx)
    if err != nil {
        if database.NotFound(err) {
            return nil, nil
        }

        return nil, terrors.Wrap(err, nil)
    }

    brand := &domain.Brand{}
    if err := snap.DataTo(&brand); err != nil {
        return nil, terrors.Wrap(err, nil)
    }

    return brand, nil
}

func ReadBrandByShortName(ctx context.Context, name string) (*domain.Brand, error) {
    snap, err := brandsByShortName.Doc(name).Get(ctx)
    if err != nil {
        if database.NotFound(err) {
            return nil, nil
        }

        return nil, terrors.Wrap(err, nil)
    }

    brand := &domain.Brand{}
    if err := snap.DataTo(&brand); err != nil {
        return nil, terrors.Wrap(err, nil)
    }

    return brand, nil
}

func CreateBrand(ctx context.Context, brand *domain.Brand) error {
    if err := Firestore.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
        if err := tx.Create(brandsByID.Doc(brand.ID), brand); err != nil {
            if database.AlreadyExists(err) {
                return database.ErrAlreadyExists("brand", "id", brand.ID)
            }

            return err
        }

        if err := tx.Create(brandsBySlug.Doc(brand.Slug), brand); err != nil {
            if database.AlreadyExists(err) {
                return database.ErrAlreadyExists("brand", "slug", brand.Slug)
            }

            return err
        }

        if err := tx.Create(brandsByShortName.Doc(brand.ShortName), brand); err != nil {
            if database.AlreadyExists(err) {
                return database.ErrAlreadyExists("brand", "short_name", brand.ShortName)
            }

            return err
        }

        return nil
    }); err != nil {
        return terrors.Wrap(err, nil)
    }

    return nil
}

func UpdateBrand(ctx context.Context, brand *domain.Brand) error {
    if err := Firestore.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
        if err := tx.Set(brandsByID.Doc(brand.ID), brand); err != nil {
            return err
        }

        if err := tx.Set(brandsBySlug.Doc(brand.Slug), brand); err != nil {
            return err
        }

        if err := tx.Set(brandsByShortName.Doc(brand.ShortName), brand); err != nil {
            return err
        }

        return nil
    }); err != nil {
        return terrors.Wrap(err, nil)
    }

    return nil
}

func DeleteBrand(ctx context.Context, brand *domain.Brand) error {
    if err := Firestore.RunTransaction(ctx, func(ctx context.Context, tx *firestore.Transaction) error {
        if err := tx.Delete(brandsByID.Doc(brand.ID)); err != nil {
            return err
        }

        if err := tx.Delete(brandsBySlug.Doc(brand.Slug)); err != nil {
            return err
        }

        if err := tx.Delete(brandsByShortName.Doc(brand.ShortName)); err != nil {
            return err
        }

        return nil
    }); err != nil {
        return terrors.Wrap(err, nil)
    }

    return nil
}

func ListBrands(ctx context.Context) ([]*domain.Brand, error) {
    documents := brandsByID.Documents(ctx)
    defer documents.Stop()

    brands := make([]*domain.Brand, 0, 32)
    for {
        doc, err := documents.Next()
        if err == iterator.Done {
            break
        }
        if err != nil {
            return nil, terrors.Wrap(err, nil)
        }

        brand := &domain.Brand{}
        if err := doc.DataTo(&brand); err != nil {
            return nil, terrors.Wrap(err, nil)
        }

        brands = append(brands, brand)
    }

    return brands, nil
}