package service

import (
	"fmt"

	"dd_fiber_api/internal/admin_auth"
	"dd_fiber_api/internal/admin_auth/dao"
	"dd_fiber_api/pkg/snowflake"
)

// PermissionService 权限服务
type PermissionService struct {
	permissionDAO *dao.PermissionDAO
}

// NewPermissionService 创建权限服务
func NewPermissionService(permissionDAO *dao.PermissionDAO) *PermissionService {
	return &PermissionService{
		permissionDAO: permissionDAO,
	}
}

// ListPermissions 列出权限
func (s *PermissionService) ListPermissions(keyword, resource string, page, pageSize int) ([]*admin_auth.AdminPermission, int, error) {
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 10
	}
	if pageSize > 100 {
		pageSize = 100
	}

	return s.permissionDAO.List(keyword, resource, page, pageSize)
}

// GetPermission 获取权限详情
func (s *PermissionService) GetPermission(id string) (*admin_auth.AdminPermission, error) {
	return s.permissionDAO.GetByID(id)
}

// CreatePermission 创建权限
func (s *PermissionService) CreatePermission(permission *admin_auth.AdminPermission) error {
	// 检查代码是否已存在
	existing, err := s.permissionDAO.GetByCode(permission.Code)
	if err != nil {
		return fmt.Errorf("检查权限代码失败: %v", err)
	}
	if existing != nil {
		return fmt.Errorf("权限代码已存在: %s", permission.Code)
	}

	// 生成ID
	permission.ID = snowflake.GenerateID()

	return s.permissionDAO.Create(permission)
}

// UpdatePermission 更新权限
func (s *PermissionService) UpdatePermission(permission *admin_auth.AdminPermission) error {
	// 检查权限是否存在
	existing, err := s.permissionDAO.GetByID(permission.ID)
	if err != nil {
		return fmt.Errorf("查询权限失败: %v", err)
	}
	if existing == nil {
		return fmt.Errorf("权限不存在")
	}

	// 如果修改了代码，检查新代码是否已存在
	if permission.Code != existing.Code {
		codeExists, err := s.permissionDAO.GetByCode(permission.Code)
		if err != nil {
			return fmt.Errorf("检查权限代码失败: %v", err)
		}
		if codeExists != nil {
			return fmt.Errorf("权限代码已存在: %s", permission.Code)
		}
	}

	return s.permissionDAO.Update(permission)
}

// DeletePermission 删除权限
func (s *PermissionService) DeletePermission(id string) error {
	return s.permissionDAO.Delete(id)
}

// GetResources 获取所有资源列表
func (s *PermissionService) GetResources() ([]string, error) {
	return s.permissionDAO.GetResources()
}