source: frontend/node_modules/istanbul-reports/lib/html-spa/src/summaryTableHeader.js

const React = require('react');

function getSortDetails(sortKey, activeSort) {
    let newSort = { sortKey, order: 'desc' };
    let sortClass = '';
    if (activeSort && activeSort.sortKey === sortKey) {
        sortClass = 'sorted';
        if (activeSort.order === 'desc') {
            sortClass += '-desc';
            newSort.order = 'asc';
        } else {
            if (sortKey !== 'file') {
                newSort = { sortKey: 'file', order: 'desc' };
            }
        }
    }

    return {
        newSort,
        sortClass
    };
}

function SummaryTableHeaderCell({ name, onSort, sortKey, activeSort }) {
    const { newSort, sortClass } = getSortDetails(sortKey, activeSort);
    return (
        <th
            className={'sortable headercell ' + sortClass}
            onClick={() => onSort(newSort)}
        >
            {name}
            <span className="sorter" />
        </th>
    );
}

function FileHeaderCell({ onSort, activeSort }) {
    const { newSort, sortClass } = getSortDetails('file', activeSort);

    return (
        <th
            className={'sortable file ' + sortClass}
            onClick={() => onSort(newSort)}
        >
            File
            <span className="sorter" />
        </th>
    );
}

function SubHeadings({ sortKeyPrefix, onSort, activeSort }) {
    return (
        <>
            <SummaryTableHeaderCell
                name="%"
                onSort={onSort}
                sortKey={sortKeyPrefix + '.pct'}
                activeSort={activeSort}
            />
            <th className="headercell"></th>
            <SummaryTableHeaderCell
                name="Covered"
                onSort={onSort}
                sortKey={sortKeyPrefix + '.covered'}
                activeSort={activeSort}
            />
            <SummaryTableHeaderCell
                name="Missed"
                onSort={onSort}
                sortKey={sortKeyPrefix + '.missed'}
                activeSort={activeSort}
            />
            <SummaryTableHeaderCell
                name="Total"
                onSort={onSort}
                sortKey={sortKeyPrefix + '.total'}
                activeSort={activeSort}
            />
        </>
    );
}

module.exports = function SummaryTableHeader({
    onSort,
    activeSort,
    metricsToShow
}) {
    return (
        <thead>
            <tr className="topheading">
                <th></th>
                {metricsToShow.statements && <th colSpan={5}>Statements</th>}
                {metricsToShow.branches && <th colSpan={5}>Branches</th>}
                {metricsToShow.functions && <th colSpan={5}>Functions</th>}
                {metricsToShow.lines && <th colSpan={5}>Lines</th>}
            </tr>
            <tr className="subheading">
                <FileHeaderCell onSort={onSort} activeSort={activeSort} />
                {metricsToShow.statements && (
                    <SubHeadings
                        sortKeyPrefix="statements"
                        onSort={onSort}
                        activeSort={activeSort}
                    />
                )}
                {metricsToShow.branches && (
                    <SubHeadings
                        sortKeyPrefix="branches"
                        onSort={onSort}
                        activeSort={activeSort}
                    />
                )}
                {metricsToShow.functions && (
                    <SubHeadings
                        sortKeyPrefix="functions"
                        onSort={onSort}
                        activeSort={activeSort}
                    />
                )}
                {metricsToShow.lines && (
                    <SubHeadings
                        sortKeyPrefix="lines"
                        onSort={onSort}
                        activeSort={activeSort}
                    />
                )}
            </tr>
        </thead>
    );
};