package service

import (
	"context"
	"errors"

	"github.com/ocdp/cluster-service/internal/domain/entity"
	"github.com/ocdp/cluster-service/internal/domain/repository"
)

var (
	ErrStorageNotFound = errors.New("storage backend not found")
	ErrStorageExists   = errors.New("storage backend already exists")
)

// StorageService 存储后端领域服务
type StorageService struct {
	storageRepo repository.StorageRepository
}

// NewStorageService 创建存储后端服务
func NewStorageService(storageRepo repository.StorageRepository) *StorageService {
	return &StorageService{
		storageRepo: storageRepo,
	}
}

// Create 创建存储后端
func (s *StorageService) Create(
	ctx context.Context,
	workspaceID, ownerID, name string,
	storageType entity.StorageType,
	config entity.StorageConfig,
	description string,
	isDefault, isShared bool,
) (*entity.StorageBackend, error) {
	// 检查名称是否已存在
	existing, _ := s.storageRepo.GetByName(ctx, workspaceID, name)
	if existing != nil {
		return nil, ErrStorageExists
	}

	storage := entity.NewStorageBackend(workspaceID, ownerID, name, storageType, config)
	storage.Description = description
	storage.IsDefault = isDefault
	storage.IsShared = isShared

	if err := s.storageRepo.Create(ctx, storage); err != nil {
		return nil, err
	}

	return storage, nil
}

// GetByID 获取存储后端
func (s *StorageService) GetByID(ctx context.Context, id string) (*entity.StorageBackend, error) {
	storage, err := s.storageRepo.GetByID(ctx, id)
	if err != nil {
		return nil, ErrStorageNotFound
	}
	return storage, nil
}

// GetByWorkspace 获取工作空间的所有存储后端
func (s *StorageService) GetByWorkspace(ctx context.Context, workspaceID string) ([]*entity.StorageBackend, error) {
	return s.storageRepo.GetByWorkspace(ctx, workspaceID)
}

// GetShared 获取所有共享存储后端
func (s *StorageService) GetShared(ctx context.Context) ([]*entity.StorageBackend, error) {
	return s.storageRepo.GetShared(ctx)
}

// GetDefault 获取工作空间的默认存储后端
func (s *StorageService) GetDefault(ctx context.Context, workspaceID string) (*entity.StorageBackend, error) {
	return s.storageRepo.GetDefault(ctx, workspaceID)
}

// Update 更新存储后端
func (s *StorageService) Update(
	ctx context.Context,
	id, name, description string,
	storageType entity.StorageType,
	config entity.StorageConfig,
	isDefault, isShared bool,
) (*entity.StorageBackend, error) {
	storage, err := s.storageRepo.GetByID(ctx, id)
	if err != nil {
		return nil, ErrStorageNotFound
	}

	if name != "" {
		storage.Name = name
	}
	storage.Description = description
	storage.Type = storageType
	storage.Config = config
	storage.IsDefault = isDefault
	storage.IsShared = isShared

	if err := s.storageRepo.Update(ctx, storage); err != nil {
		return nil, err
	}

	return storage, nil
}

// Delete 删除存储后端
func (s *StorageService) Delete(ctx context.Context, id string) error {
	return s.storageRepo.Delete(ctx, id)
}

// List 列出所有存储后端（管理员用）
func (s *StorageService) List(ctx context.Context) ([]*entity.StorageBackend, error) {
	return s.storageRepo.List(ctx)
}