package service

import (
	"context"
	"os"

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

// RegistryService Registry 管理领域服务
type RegistryService struct {
	registryRepo repository.RegistryRepository
	ociClient    repository.OCIClient
}

// NewRegistryService 创建 Registry 服务
func NewRegistryService(
	registryRepo repository.RegistryRepository,
	ociClient repository.OCIClient,
) *RegistryService {
	return &RegistryService{
		registryRepo: registryRepo,
		ociClient:    ociClient,
	}
}

// CreateRegistry 创建新 Registry
func (s *RegistryService) CreateRegistry(ctx context.Context, registry *entity.Registry) error {
	// 生成 ID
	registry.ID = uuid.New().String()

	// 验证
	if err := registry.Validate(); err != nil {
		return err
	}

	// 检查是否已存在
	existingRegistry, _ := s.registryRepo.GetByName(ctx, registry.Name)
	if existingRegistry != nil {
		return entity.ErrRegistryExists
	}

	// 非 mock 模式下验证连接
	if os.Getenv("ADAPTER_MODE") != "mock" {
		if err := s.ociClient.CheckHealth(ctx, registry); err != nil {
			return err
		}
	}

	return s.registryRepo.Create(ctx, registry)
}

// GetRegistry 获取 Registry
func (s *RegistryService) GetRegistry(ctx context.Context, id string) (*entity.Registry, error) {
	return s.registryRepo.GetByID(ctx, id)
}

// UpdateRegistry 更新 Registry
func (s *RegistryService) UpdateRegistry(ctx context.Context, registry *entity.Registry) error {
	// 检查是否存在
	_, err := s.registryRepo.GetByID(ctx, registry.ID)
	if err != nil {
		return entity.ErrRegistryNotFound
	}

	// 验证
	if err := registry.Validate(); err != nil {
		return err
	}

	return s.registryRepo.Update(ctx, registry)
}

// DeleteRegistry 删除 Registry
func (s *RegistryService) DeleteRegistry(ctx context.Context, id string) error {
	// 检查是否存在
	_, err := s.registryRepo.GetByID(ctx, id)
	if err != nil {
		return entity.ErrRegistryNotFound
	}

	return s.registryRepo.Delete(ctx, id)
}

// ListRegistries 列出所有 Registries
func (s *RegistryService) ListRegistries(ctx context.Context) ([]*entity.Registry, error) {
	return s.registryRepo.List(ctx)
}

// CheckHealth 检查 Registry 健康状态
func (s *RegistryService) CheckHealth(ctx context.Context, id string) error {
	registry, err := s.registryRepo.GetByID(ctx, id)
	if err != nil {
		return entity.ErrRegistryNotFound
	}

	return s.ociClient.CheckHealth(ctx, registry)
}