package notification

import (
	"context"
	"strconv"
	"time"

	"github.com/break/junhong_cmp_fiber/internal/infrastructure/audit"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// PersonalDirectRequest 是当次直投或复用个人客户通知的请求参数。
// PopupSnapshot 只允许弹窗投放类型携带，其余类型必须为空。
type PersonalDirectRequest struct {
	NotificationType string
	TemplateData     map[string]string
	RefType          string
	RefID            string
	RefKey           string
	ExpiresAt        *time.Time
	PopupSnapshot    *model.NotificationPopupSnapshot
}

// DirectWriter 是「当次创建或复用个人客户通知」的窄接口。
// 候选查询必须当次拿到可用通知标识，不能依赖 Outbox 消费延迟，因此需要这条同步入口。
type DirectWriter interface {
	CreateOrGetPersonal(ctx context.Context, eventID string, customerID uint, request PersonalDirectRequest) (*model.Notification, error)
}

// CreateOrGetPersonal 当次渲染并幂等写入个人客户通知；事件键已存在时不重复投放，回查并返回既有行。
// 与 Outbox 消费共用同一渲染、展示期与幂等写入规则，避免两条链路规则漂移。
func (s *DeliveryService) CreateOrGetPersonal(ctx context.Context, eventID string, customerID uint, request PersonalDirectRequest) (*model.Notification, error) {
	if customerID == 0 || eventID == "" {
		return nil, errors.New(errors.CodeInvalidParam, "个人客户通知参数不完整")
	}
	delivery := deliveryRequest{
		notificationType: request.NotificationType, templateData: request.TemplateData,
		refType: request.RefType, refID: request.RefID, refKey: request.RefKey,
		expiresAt: request.ExpiresAt, popupSnapshot: request.PopupSnapshot,
	}
	if err := validateDeliveryRequest(delivery); err != nil {
		return nil, err
	}
	// API 直投不经过 Outbox 消费，自行提供渲染结果与展示期，但仍复用同一落库规则。
	// 个人客户请求上下文不携带审计上下文，直投必须显式声明操作者与入口，否则投递审计会被入口规则拒绝并静默降级。
	prepared, err := s.prepareDelivery(eventID, constants.NotificationRecipientKindPersonalCustomer, delivery, deliveryOrigin{
		actor:  audit.ActorInput{Kind: constants.AuditActorPersonalCustomer, ID: strconv.FormatUint(uint64(customerID), 10)},
		source: constants.AuditSourcePersonalAPI,
	})
	if err != nil {
		return nil, err
	}
	notification, _, err := s.deliverOne(ctx, eventID, constants.NotificationRecipientKindPersonalCustomer, customerID, delivery, prepared)
	if err != nil {
		return nil, err
	}
	if notification == nil {
		return nil, errors.New(errors.CodeInvalidStatus, "个人客户通知接收人不可用")
	}
	return notification, nil
}