return {
    async fetchConversationHistory(conversationId, limit) {

        let datahistory = await db.collection("analytics_transactions").aggregate([
            {
                $match: {
                    $and: [
                        { "conversationId": conversationId },
                        { "outputs.datacollect": true }
                    ]
                }
            }
        ]).toArray();

        console.log('10 line');
        let lastElement  = datahistory[datahistory.length - 1];
        console.log(lastElement?.metadata?.actionType);
        let messages = [];
        const tx_msg = (direction, text, sentTime) => {
            return {
                conversationId: conversationId,
                direction,
                text,
                dateSent: new Date(sentTime).toISOString(),
            };
        };
        let counts = { agent: 0, ivas: 0 };
        let agentName;
        let is_async = null;
        for (let msg of datahistory) {
            if (msg?.answers.length) {
                if (msg?.input !== "") {
                    messages.push(tx_msg("ToAgent", msg?.input, (msg?.metadata?.createdAt ?? Date.now())));
                }
                counts.ivas++;
                for (let i = 0; i < msg?.answers.length; i++) {
                    let answer = msg.answers[i];
                    if (typeof answer !== "string") {
                        answer = JSON.stringify(answer ?? null);
                    }
                    messages.push(tx_msg("ToCustomer", answer, (msg?.metadata?.createdAt ?? Date.now()) + 50 + i));
                    counts.ivas++;
                }
            }
            if (limit > 0 && messages.length >= limit) break;
        }

        const summary = {
            conversationId: conversationId,
            steps: []
        };

       
        messages.forEach(msg => {
            summary.steps.push({
                who: msg.direction === "ToAgent" ? "Customer" : "System",
                text: msg.text,
                time: new Date(msg.dateSent).toLocaleString()
            });
        });
        let history = ``;
        summary.steps.forEach((step, index) => {
            history += `<strong>${step.who}:</strong> ${step.text}<br/>`;
        });
        history+= `<strong>ActionType:</strong> ${lastElement?.metadata?.actionType}`
        return history;
    }
};