main.js

function renderEstimates() {
	class Estimate {
		constructor() {
			Object.assign(this, {
				w: 0,
				d: 0,
				h: 0,
				m: 0,
			});
		}

		normalize() {
			let { w, d, h, m } = this;

			if (m > 59) {
				h += (m - m % 60) / 60;
				m = m % 60;
			}

			if (h > 7) {
				d += (h - h % 8) / 8;
				h = h % 8;
			}

			if (d > 4) {
				w += (d - d % 5) / 5;
				d = d % 5;
			}

			Object.assign(this, { w, d, h, m });
		}

		get verbose() {
			const { w, d, h, m } = this;

			return `
				${w ? `${w}w` : ''}
				${d ? `${d}d` : ''}
				${h ? `${h}h` : ''}
				${m ? `${m}m` : ''}
			`;
		}

		get days() {
			const { w, d, h, m } = this;
			const days = w * 5 + d + h / 8 + m / 8 / 60;
			const daysRound = parseFloat(days.toFixed(2));
			const pre = days === daysRound ? '' : '~';
	
			return `${pre}${daysRound} days`;
		}

		get hours() {
			const { w, d, h, m } = this;
			const hours = w * 5 * 8 + d * 8 + h + m / 60;
			const hoursRound = parseFloat(hours.toFixed(2));
			const pre = hours === hoursRound ? '' : '~';
	
			return `${pre}${hoursRound} hours`;
		}
	}

	const pending = document.getElementsByClassName('pending').length !== 0;

	if (pending) {
		return setTimeout(renderEstimates, 300);
	}

	const $issueTable = document.getElementById('issuetable');

	if ($issueTable) {
		try {
			const $existingTotalsRows = document.getElementsByClassName('jira-helper-totals-row');
			for (const $row of [...$existingTotalsRows]) {
				$row.remove();
			}
			const $tableBody = $issueTable.getElementsByTagName('tbody')[0];
			const $rows = $tableBody.childNodes;
			const targetColumns = [
				'timeoriginalestimate',
				'aggregatetimeoriginalestimate',
				'timespent',
				'aggregatetimespent',
				'timeestimate',
				'aggregatetimeestimate',
			];

			const $totalsRow = $rows[0].cloneNode(true);

			$totalsRow.setAttribute('class', 'jira-helper-totals-row');
			$totalsRow.removeAttribute('id');
			$totalsRow.removeAttribute('rel');
			$totalsRow.removeAttribute('data-issuekey');

			const estimatesMap = new Map();

			Array.prototype.forEach.call($rows, $row => {
				targetColumns.forEach(col => {
					const $col = $row.getElementsByClassName(col)[0];

					if ($col) {
						const parts = $col.innerHTML.split(', ');
	
						parts.forEach(part => {
							const match = /(^\d+(?:\.\d+)?) (\w)/.exec(part);

							if (match) {
								const estimate = estimatesMap.get(col) || new Estimate();
								estimate[match[2]] += Number(match[1]);
								estimatesMap.set(col, estimate);
							}
						});
					}
				});
			});

			estimatesMap.forEach(value => value.normalize());

			$totalsRow.childNodes.forEach($col => {
				const estimate = estimatesMap.get($col.className);
				if (estimate) {
					$col.innerHTML = `
						<div>${estimate.verbose}</div>
						<div>${estimate.days}</div>
						<div>${estimate.hours}</div>
					`;
					$col.style = 'white-space: nowrap;padding-right: 15px;';
				} else {
					$col.innerHTML = '';
				}
			});

			$tableBody.prepend($totalsRow);
			$tableBody.append($totalsRow.cloneNode(true));
		} catch(e) {
			const message = 'jira-helper: OOPS! Something went wrong';
			console.info(`${message}\n${e}`);
			alert(`${message}; Check console for details`);
		}
	}
}

renderEstimates();