package storage

import (
	"context"
	"errors"
	"io"
	"time"

	"github.com/oklog/ulid/v2"
)

var (
	ErrBucketClosed = errors.New("bucket closed")
	ErrBlobNotFound = errors.New("blob not found")
)

type BlobID string

func NewBlobID() BlobID {
	return BlobID(ulid.Make().String())
}

type BlobStore interface {
	OpenBucket(ctx context.Context, name string) (BlobBucket, error)
	ListBuckets(ctx context.Context) ([]string, error)
	DeleteBucket(ctx context.Context, name string) error
}

type BlobBucket interface {
	Name() string
	Close() error

	Get(ctx context.Context, id BlobID) (BlobInfo, error)
	Delete(ctx context.Context, id BlobID) error
	NewReader(ctx context.Context, id BlobID) (io.ReadSeekCloser, error)
	NewWriter(ctx context.Context, id BlobID) (io.WriteCloser, error)
	List(ctx context.Context) ([]BlobInfo, error)
	Size(ctx context.Context) (int64, error)
}

type BlobInfo interface {
	ID() BlobID
	Bucket() string
	ModTime() time.Time
	Size() int64
	ContentType() string
}

type BucketListOptions struct {
	Limit  *int
	Offset *int
}

type BucketListOptionsFunc func(o *BucketListOptions)

func WithBucketListLimit(limit int) BucketListOptionsFunc {
	return func(o *BucketListOptions) {
		o.Limit = &limit
	}
}

func WithBucketListOffset(offset int) BucketListOptionsFunc {
	return func(o *BucketListOptions) {
		o.Offset = &offset
	}
}