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const Balance = require('./Balance');
const { logViolation } = require('../cache');
/**
* Checks the balance for a user and determines if they can spend a certain amount.
* If the user cannot spend the amount, it logs a violation and denies the request.
*
* @async
* @function
* @param {Object} params - The function parameters.
* @param {Object} params.req - The Express request object.
* @param {Object} params.res - The Express response object.
* @param {Object} params.txData - The transaction data.
* @param {string} params.txData.user - The user ID or identifier.
* @param {('prompt' | 'completion')} params.txData.tokenType - The type of token.
* @param {number} params.txData.amount - The amount of tokens.
* @param {boolean} params.txData.debug - Debug flag.
* @param {string} params.txData.model - The model name or identifier.
* @returns {Promise<boolean>} Returns true if the user can spend the amount, otherwise denies the request.
* @throws {Error} Throws an error if there's an issue with the balance check.
*/
const checkBalance = async ({ req, res, txData }) => {
const { canSpend, balance, tokenCost } = await Balance.check(txData);
if (canSpend) {
return true;
}
const type = 'token_balance';
const errorMessage = {
type,
balance,
tokenCost,
promptTokens: txData.amount,
};
if (txData.generations && txData.generations.length > 0) {
errorMessage.generations = txData.generations;
}
await logViolation(req, res, type, errorMessage, 0);
throw new Error(JSON.stringify(errorMessage));
};
module.exports = checkBalance;
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