package file_manager

import (
	"time"
)

type Option func(*option)
type option struct {
	dir        *string
	timeout    time.Duration
	expire     time.Duration
	verifyHash bool
	s3         *s3Config
}

type s3Config struct {
	endpoint     string
	accessKey    string
	secretKey    string
	bucket       string
	region       string
	usePathStyle bool
}

func WithDir(dir string) Option {
	return func(o *option) {
		if dir != "" {
			o.dir = &dir
		}
	}
}

func WithTimeout(timeout time.Duration) Option {
	return func(o *option) {
		if timeout > 0 {
			o.timeout = timeout
		}
	}
}

func WithExpire(expire time.Duration) Option {
	return func(o *option) {
		if expire > 0 {
			o.expire = expire
		}
	}
}

func WithS3(endpoint, accessKey, secretKey, bucket, region string) Option {
	return func(o *option) {
		o.s3 = &s3Config{
			endpoint:  endpoint,
			accessKey: accessKey,
			secretKey: secretKey,
			bucket:    bucket,
			region:    region,
		}
	}
}

func WithS3PathStyle(usePathStyle bool) Option {
	return func(o *option) {
		if o.s3 != nil {
			o.s3.usePathStyle = usePathStyle
		}
	}
}

// New 创建文件管理器
func New(opts ...Option) FileManager {
	o := &option{
		timeout:    1 * time.Minute,
		expire:     8 * time.Hour,
		verifyHash: true,
	}
	for _, opt := range opts {
		opt(o)
	}

	if o.s3 != nil {
		return NewS3FileManager(o)
	}
	return NewLocalFileManager(o)
}