"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CountDocumentsOperation = void 0;
const aggregate_1 = require("./aggregate");
/** @internal */
class CountDocumentsOperation extends aggregate_1.AggregateOperation {
    constructor(collection, query, options) {
        const pipeline = [];
        pipeline.push({ $match: query });
        if (typeof options.skip === 'number') {
            pipeline.push({ $skip: options.skip });
        }
        if (typeof options.limit === 'number') {
            pipeline.push({ $limit: options.limit });
        }
        pipeline.push({ $group: { _id: 1, n: { $sum: 1 } } });
        super(collection.s.namespace, pipeline, options);
    }
    executeCallback(server, session, callback) {
        super.executeCallback(server, session, (err, result) => {
            if (err || !result) {
                callback(err);
                return;
            }
            // NOTE: We're avoiding creating a cursor here to reduce the callstack.
            const response = result;
            if (response.cursor == null || response.cursor.firstBatch == null) {
                callback(undefined, 0);
                return;
            }
            const docs = response.cursor.firstBatch;
            callback(undefined, docs.length ? docs[0].n : 0);
        });
    }
}
exports.CountDocumentsOperation = CountDocumentsOperation;
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