package zones

import (
	"io/fs"
	"path/filepath"

	"darvaza.org/resolver"
	"github.com/hack-pad/hackpadfs/os"
)

// A ScanOption preconfigures the Zones before scanning
type ScanOption func(*Zones, *ScanOptions) error

// ScanOptions contains flags used by the initial scan
type ScanOptions struct{}

func (*Zones) setDefaults(_ *ScanOptions) error {
	return nil
}

// NewFS builds a [Zones] tree using the given directory
func NewFS(dir fs.FS, domain string, opts ...ScanOption) (*Zones, error) {
	var scanOptions ScanOptions

	lockuper := resolver.NewCloudflareLookuper()

	z := &Zones{
		dir:      dir,
		resolver: resolver.NewResolver(lockuper),
		domain:   domain,
	}

	for _, opt := range opts {
		if err := opt(z, &scanOptions); err != nil {
			return nil, err
		}
	}

	if err := z.setDefaults(&scanOptions); err != nil {
		return nil, err
	}

	if err := z.scan(&scanOptions); err != nil {
		return nil, err
	}

	return z, nil
}

// New builds a [Zones] tree using the given directory
func New(dir, domain string, opts ...ScanOption) (*Zones, error) {
	dir, err := filepath.Abs(dir)
	if err != nil {
		return nil, err
	}

	base, err := os.NewFS().Sub(dir[1:])
	if err != nil {
		return nil, err
	}

	return NewFS(base, domain, opts...)
}