package langpack

import (
	"context"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strings"
)

// SeedDirectory 将导出的 .strings 文件导入 LangPackStore。
// root 可直接指向 data/langpack，也可指向包含 .strings 的具体平台目录。
func (s *Service) SeedDirectory(ctx context.Context, root string) (int, error) {
	if s == nil || s.packs == nil || root == "" {
		return 0, nil
	}
	dir := filepath.Clean(root)
	if _, err := os.Stat(dir); err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return 0, nil
		}
		return 0, fmt.Errorf("stat langpack seed dir: %w", err)
	}

	seeded := 0
	err := filepath.WalkDir(dir, func(path string, entry os.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if entry.IsDir() || !strings.EqualFold(filepath.Ext(entry.Name()), ".strings") {
			return nil
		}
		pack, err := ParseTDesktopFile(path)
		if err != nil {
			return err
		}
		existing, err := s.packs.GetPack(ctx, pack.LangPack, pack.LangCode, pack.Version)
		if err != nil {
			return err
		}
		if existing.Version >= pack.Version {
			return nil
		}
		if err := s.packs.UpsertPack(ctx, pack); err != nil {
			return err
		}
		seeded += len(pack.Strings)
		return nil
	})
	if err != nil {
		return seeded, fmt.Errorf("walk langpack seed dir: %w", err)
	}
	return seeded, nil
}