function updateParents(item, partial) {
    let parentul = item.parentNode;
    if ("menu" == parentul.id) return;

    let parentli = parentul.parentNode;
    let foundap = 0;
    let foundact = 0;
    let founddeact = 0;
    if (partial) foundap = 1;
    else {
        for (let i = 0; i < parentul.childNodes.length; i++) {
            let node = parentul.childNodes[i];
            if (node.dataset.active == 'partial') {
                foundap = 1;
                break;
            }
            else if (node.dataset.active == 'yes') foundact = 1;
            else founddeact = 1;
            if (2 == (foundact + founddeact)) {
                foundap = 1;
                break;
            }
        }
    }

    var cb = document.querySelector("#cb-" + parentli.id);
    if (foundap) {
        parentli.dataset.active = 'partial';
	if (cb) {
	    cb.indeterminate = true;
	    cb.checked = false;
	}
    }
    else if (foundact) {
        parentli.dataset.active = 'yes';
	if (cb) {
	    cb.indeterminate = false;
	    cb.checked = true;
	}
	if (cb) cb.checked = true;
    }
    else {
        parentli.dataset.active = 'no';
	if (cb) {
	    cb.indeterminate = false;
	    cb.checked = false;
	}
    }

    updateParents(parentli, foundap);
}

function highlightMarker(id, highlight) {
    if (markers[id] && null != markers[id].getMap() && markers[id].setAnimation) {
	markers[id].setAnimation(highlight ? google.maps.Animation.BOUNCE : null);
    }
}

function activateMarker(marker, activate) {
    if (marker) {
	if ("function" == typeof marker.setMap) {
	    marker = [marker];
	}

	if (activate) {
	    marker.forEach(m => {
		m.setMap(map);
		if (m.setAnimation) {
		    m.setAnimation(google.maps.Animation.BOUNCE);
		    setTimeout(() => m.setAnimation(null), 500);
		}
	    });
	}
	else {
	    marker.forEach(m => m.setMap(null));
	}
    }
}
function doDeactivate(item) {
    var cb = document.querySelector("#cb-" + item.id);
    if (cb) {
	cb.indeterminate = false;
	cb.checked = false;
    }

    item.dataset.active = 'no';
    activateMarker(markers[item.id], false);

    let subitems = item.querySelector("ul");
    if (null != subitems) subitems.childNodes.forEach(n => doDeactivate(n));

    updateParents(item);
}

function doActivate(item) {
    var cb = document.querySelector("#cb-" + item.id);
    if (cb) {
	cb.indeterminate = false;
	cb.checked = true;
    }

    item.dataset.active = 'yes';
    activateMarker(markers[item.id], true);

    let subitems = item.querySelector("ul");
    if (null != subitems) subitems.childNodes.forEach(n => doActivate(n));

    updateParents(item);
}

function updateURL() {
    marr = [];
    for (let m in markers) {
	if ("function" == typeof markers[m].getMap) {
	    if (null != markers[m].getMap()) marr.push(m);
	}
	else if ("function" == typeof markers[m][0].getMap && null != markers[m][0].getMap()) {
	    marr.push(m);
	}
    }
    let page = love ? "love.html" : "";
    window.history.replaceState(null, "Fairfax", "./" + page + "?m=" + marr.join(","));
}

function toggleActivate(id) {
    let item = document.querySelector("#" + id);
    if (item.dataset.active == 'yes') {
        doDeactivate(item);
    }
    else {
        doActivate(item);
    }

    updateURL();
}