const _ = require("lodash");
const queries = require("../graphql-client/queries");
const moment = require("moment");
const durationToHumanReadable = require("../utils/durationToHumanReadable");
const calculateStatusDuration = require("../utils/calculateStatusDuration");

const jobLifecycle = async (req, res) => {
    // Grab the jobids and statuses from the request body
    const {
        jobids,
        statuses
    } = req.body;

    if (!jobids) {
        return res.status(400).json({
            error: "Missing jobids"
        });
    }

    const jobIDs = _.isArray(jobids) ? jobids : [jobids];
    const client = req.userGraphQLClient;
    const resp = await client.request(queries.QUERY_TRANSITIONS_BY_JOBID, {jobids: jobIDs,});

    const transitions = resp.transitions;

    if (!transitions) {
        return res.status(200).json({
            jobIDs,
            transitions: []
        });

    }

    const transitionsByJobId = _.groupBy(resp.transitions, 'jobid');

    const groupedTransitions = {};

    for (let jobId in transitionsByJobId) {
        let lifecycle = transitionsByJobId[jobId].map(transition => {
            transition.start_readable = transition.start ? moment(transition.start).fromNow() : 'N/A';
            transition.end_readable = transition.end ? moment(transition.end).fromNow() : 'N/A';

            if (transition.duration) {
                transition.duration_seconds = Math.round(transition.duration / 1000);
                transition.duration_minutes = Math.round(transition.duration_seconds / 60);
                let duration = moment.duration(transition.duration);
                transition.duration_readable = durationToHumanReadable(duration);
            } else {
                transition.duration_seconds = 0;
                transition.duration_minutes = 0;
                transition.duration_readable = 'N/A';
            }
            return transition;
        });

        groupedTransitions[jobId] = {
            lifecycle: lifecycle,
            durations: calculateStatusDuration(lifecycle, statuses),
        };
    }

    return res.status(200).json({
        jobIDs,
        transition: groupedTransitions,
    });
}

module.exports = jobLifecycle;