// Изменено: 2026-04-11 — убрана зависимость от copystructure (лишняя аллокация)
// GetQueueAttributesV1 — возвращает атрибуты очереди тенанта.
package gosqs

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"shared-sqs/app/interfaces"
	"shared-sqs/app/models"
	"shared-sqs/app/utils"

	log "github.com/sirupsen/logrus"
)

func GetQueueAttributesV1(req *http.Request) (int, interfaces.AbstractResponseBody) {
	requestBody := models.NewGetQueueAttributesRequest()
	ok := utils.REQUEST_TRANSFORMER(requestBody, req, false)
	if !ok {
		log.Error("Invalid Request - GetQueueAttributesV1")
		return utils.CreateErrorResponseV1("InvalidParameterValue", true)
	}
	if requestBody.QueueUrl == "" {
		log.Error("Missing QueueUrl - GetQueueAttributesV1")
		return utils.CreateErrorResponseV1("InvalidParameterValue", true)
	}

	t := getTenantFromContext(req)
	if t == nil {
		return utils.CreateErrorResponseV1("InvalidClientTokenId", true)
	}

	// Определяем набор запрошенных атрибутов (или All)
	requestedAttributes := func() map[string]bool {
		attrs := map[string]bool{}
		if len(requestBody.AttributeNames) == 0 {
			return map[string]bool{"All": true}
		}
		for _, attr := range requestBody.AttributeNames {
			if "All" == attr {
				return map[string]bool{"All": true}
			}
			attrs[attr] = true
		}
		return attrs
	}()

	// Фильтруем атрибуты без deep copy — простая проверка через map lookup
	_, wantAll := requestedAttributes["All"]
	shouldInclude := func(attr string) bool {
		if wantAll {
			return true
		}
		_, ok := requestedAttributes[attr]
		return ok
	}

	uriSegments := strings.Split(requestBody.QueueUrl, "/")
	queueName := uriSegments[len(uriSegments)-1]
	key := tenantQueueKey(t.AccessKey, queueName)

	log.Infof("Get Queue Attributes: %s (tenant: %s)", queueName, t.ID)
	queueAttributes := make([]models.Attribute, 0)

	models.SyncQueues.RLock()
	defer models.SyncQueues.RUnlock()
	queue, ok := models.SyncQueues.Queues[key]
	if !ok {
		log.Errorf("Get Queue Attributes: %s queue does not exist for tenant %s", queueName, t.ID)
		return utils.CreateErrorResponseV1("QueueNotFound", true)
	}

	if shouldInclude("DelaySeconds") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "DelaySeconds", Value: strconv.Itoa(queue.DelaySeconds)})
	}
	if shouldInclude("MaximumMessageSize") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "MaximumMessageSize", Value: strconv.Itoa(queue.MaximumMessageSize)})
	}
	if shouldInclude("MessageRetentionPeriod") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "MessageRetentionPeriod", Value: strconv.Itoa(queue.MessageRetentionPeriod)})
	}
	if shouldInclude("ReceiveMessageWaitTimeSeconds") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "ReceiveMessageWaitTimeSeconds", Value: strconv.Itoa(queue.ReceiveMessageWaitTimeSeconds)})
	}
	if shouldInclude("VisibilityTimeout") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "VisibilityTimeout", Value: strconv.Itoa(queue.VisibilityTimeout)})
	}
	if shouldInclude("ApproximateNumberOfMessages") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "ApproximateNumberOfMessages", Value: strconv.Itoa(len(queue.Messages))})
	}
	if shouldInclude("ApproximateNumberOfMessagesNotVisible") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "ApproximateNumberOfMessagesNotVisible", Value: strconv.Itoa(numberOfHiddenMessagesInQueue(*queue))})
	}
	if shouldInclude("CreatedTimestamp") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "CreatedTimestamp", Value: "0000000000"})
	}
	if shouldInclude("LastModifiedTimestamp") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "LastModifiedTimestamp", Value: "0000000000"})
	}
	if shouldInclude("QueueArn") {
		queueAttributes = append(queueAttributes, models.Attribute{Name: "QueueArn", Value: queue.Arn})
	}
	if shouldInclude("RedrivePolicy") && queue.DeadLetterQueue != nil {
		queueAttributes = append(queueAttributes, models.Attribute{
			Name:  "RedrivePolicy",
			Value: fmt.Sprintf(`{"maxReceiveCount":"%d", "deadLetterTargetArn":"%s"}`, queue.MaxReceiveCount, queue.DeadLetterQueue.Arn),
		})
	}

	respStruct := models.GetQueueAttributesResponse{
		Xmlns:    models.BaseXmlns,
		Result:   models.GetQueueAttributesResult{Attrs: queueAttributes},
		Metadata: models.BaseResponseMetadata,
	}
	return http.StatusOK, respStruct
}