/**
 * Created by Julin on 2022/11/07.
 */
'use strict';

module.exports = async function () {
    try {
        // 1. delete all rows in the table 
        await clearStatsProcessNodes();
        // 2. insert data into the table 
        let processes = await process.clickhouse['pg_pepca_m'].query(`
            select v.id as version_id,
                v.process_id as process_id,
                p.name as process_name,
                v.bpmn_json
            from workflow_process_version as v
            inner join workflow_process as p on v.process_id=p.id
            where v.current=true and p.is_enable=true and p.deleted=false
            order by v.id desc
        `).toPromise();
        let dataToDB = processes.reduce((p, c) => {
            let nodes = JSON.parse(c.bpmn_json);
            let taskNodesCount = 0;
            for (let key in nodes) {
                if (nodes[key].type == 'bpmn:UserTask') taskNodesCount++;
            }
            p.push({
                processVersionId: c.version_id,
                processId: c.process_id,
                processName: c.process_name,
                processNodesTotal: taskNodesCount
            });
            return p;
        }, []);
        await storageStatsProcessNodes(dataToDB);
    } catch (err) {
        process.logger.error('Something error in function [statProcessNodes]:', err);
    }
};

async function clearStatsProcessNodes() {
    const transaction = await process.postgres.orm.transaction();
    const models = process.postgres.models;
    const { Op } = process.postgres.ORM;
    try {
        await models.StatsProcessNodes.destroy({
            where: { processVersionId: { [Op.gt]: 0 } },
            transaction
        });
        await transaction.commit();
    } catch (err) {
        await transaction.rollback();
        process.logger.error('Destroy data from Postgres DB [stats_process_nodes] error:', err);
    }
};

async function storageStatsProcessNodes(data) {
    const transaction = await process.postgres.orm.transaction();
    const models = process.postgres.models;
    try {
        await models.StatsProcessNodes.bulkCreate(data, { transaction });
        await transaction.commit();
        process.logger.info('Sync data to Postgres DB [stats_process_nodes]');
    } catch (err) {
        await transaction.rollback();
        process.logger.error('Storage data to Postgres DB [stats_process_nodes] error:', err);
    }
};