package weekstar

import (
	"context"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/redis/go-redis/v9"
)

const weekStarRewardRetryPendingTTL = 30 * time.Minute

// enqueueRewardRetryTask 把失败发奖记录投递到 Redis Stream，交给 chatapp-cron 执行真正补发。
func (s *WeekStarService) enqueueRewardRetryTask(ctx context.Context, recordID int64) error {
	streamKey := strings.TrimSpace(s.cfg.WeekStar.RetryStreamKey)
	if streamKey == "" {
		return NewAppError(http.StatusInternalServerError, "retry_stream_not_configured", "week star retry stream is not configured")
	}

	pendingKey := s.rewardRetryPendingKey(recordID)
	acquired, err := s.repo.Redis.SetNX(ctx, pendingKey, "1", weekStarRewardRetryPendingTTL).Result()
	if err != nil {
		return err
	}
	if !acquired {
		// 已经存在待处理补发任务时直接视为幂等成功，避免重复投递。
		return nil
	}

	_, err = s.repo.Redis.XAdd(ctx, &redis.XAddArgs{
		Stream: streamKey,
		Values: map[string]any{
			"recordId": recordID,
		},
	}).Result()
	if err != nil {
		_, _ = s.repo.Redis.Del(context.Background(), pendingKey).Result()
		return err
	}
	return nil
}

// rewardRetryPendingKey 返回补发任务去重 key，避免同一条记录被重复提交。
func (s *WeekStarService) rewardRetryPendingKey(recordID int64) string {
	return strings.TrimSpace(s.cfg.WeekStar.RetryStreamKey) + ":pending:" + strconv.FormatInt(recordID, 10)
}