// sqsstats.go — сбор статистики очереди shared-SQS для админ-страницы.
package handler

import (
	"context"
	"fmt"
	"strconv"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	sqstypes "github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// iotAdminSQSStats — информация об очереди для мониторинга.
type iotAdminSQSStats struct {
	ApproximateMessages           int64  `json:"approximate_messages"`
	ApproximateMessagesNotVisible int64  `json:"approximate_messages_not_visible"`
	Error                         string `json:"error,omitempty"`
}

// collectSQSStats получает ApproximateNumberOfMessages из очереди телеметрии.
func (h *Handler) collectSQSStats(ctx context.Context) iotAdminSQSStats {
	if h.SQS == nil {
		return iotAdminSQSStats{Error: "SQS client not configured"}
	}

	queueUrlOut, err := h.SQS.GetQueueUrl(ctx, &sqs.GetQueueUrlInput{
		QueueName: aws.String(h.Cfg.SQSQueueName),
	})
	if err != nil {
		return iotAdminSQSStats{Error: fmt.Sprintf("GetQueueUrl: %v", err)}
	}

	attrsOut, err := h.SQS.GetQueueAttributes(ctx, &sqs.GetQueueAttributesInput{
		QueueUrl: queueUrlOut.QueueUrl,
		AttributeNames: []sqstypes.QueueAttributeName{
			sqstypes.QueueAttributeNameApproximateNumberOfMessages,
			sqstypes.QueueAttributeNameApproximateNumberOfMessagesNotVisible,
		},
	})
	if err != nil {
		return iotAdminSQSStats{Error: fmt.Sprintf("GetQueueAttributes: %v", err)}
	}

	approxMsg, _ := strconv.ParseInt(attrsOut.Attributes["ApproximateNumberOfMessages"], 10, 64)
	approxNotVisible, _ := strconv.ParseInt(attrsOut.Attributes["ApproximateNumberOfMessagesNotVisible"], 10, 64)

	return iotAdminSQSStats{
		ApproximateMessages:           approxMsg,
		ApproximateMessagesNotVisible: approxNotVisible,
	}
}