// Изменено: 2026-04-10 — добавлена Redis persistence
// DeleteMessageV1 — удаляет сообщение из очереди тенанта по ReceiptHandle.
package gosqs

import (
	"net/http"
	"strings"

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

	"github.com/gorilla/mux"
	log "github.com/sirupsen/logrus"
)

func DeleteMessageV1(req *http.Request) (int, interfaces.AbstractResponseBody) {
	requestBody := models.NewDeleteMessageRequest()
	ok := utils.REQUEST_TRANSFORMER(requestBody, req, false)
	if !ok {
		log.Error("Invalid Request - DeleteMessageV1")
		return utils.CreateErrorResponseV1("InvalidParameterValue", true)
	}

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

	receiptHandle := requestBody.ReceiptHandle
	queueUrl := requestBody.QueueUrl
	queueName := ""
	if queueUrl == "" {
		vars := mux.Vars(req)
		queueName = vars["queueName"]
	} else {
		uriSegments := strings.Split(queueUrl, "/")
		queueName = uriSegments[len(uriSegments)-1]
	}

	key := tenantQueueKey(t.AccessKey, queueName)
	log.Info("Deleting Message, Queue:", queueName, ", ReceiptHandle:", receiptHandle)

	models.SyncQueues.Lock()
	defer models.SyncQueues.Unlock()
	if _, ok := models.SyncQueues.Queues[key]; ok {
		for i, msg := range models.SyncQueues.Queues[key].Messages {
			if msg.ReceiptHandle == receiptHandle {
				msgUuid := msg.Uuid
				models.SyncQueues.Queues[key].UnlockGroup(msg.GroupID)
				models.SyncQueues.Queues[key].Messages = append(models.SyncQueues.Queues[key].Messages[:i], models.SyncQueues.Queues[key].Messages[i+1:]...)
				delete(models.SyncQueues.Queues[key].Duplicates, msg.DeduplicationID)
				// Удаляем одно сообщение из Redis — O(1)
				persistence.DeleteMessagePersist(key, msgUuid)
				// Метаданные очереди (duplicates, FIFO state)
				persistence.SaveQueue(key, models.SyncQueues.Queues[key])
				respStruct := models.DeleteMessageResponse{
					Xmlns:    models.BaseXmlns,
					Metadata: models.BaseResponseMetadata,
				}
				return 200, &respStruct
			}
		}
		log.Warning("Receipt Handle not found")
	} else {
		log.Warning("Queue not found")
	}

	return utils.CreateErrorResponseV1("MessageDoesNotExist", true)
}