dashboard: tighten the printer, warranty and notification cards

PRINTER CARD is now supplies at or below 5 percent, a new
printers_dashboardpercent setting. The report and the card want different
scopes: the report lists anything the thresholds call low, which is right for
planning an order, while the dashboard is asking what to walk out and change
today - and a cartridge at 18 percent is not that. Lowest first.

PRINTER LOCATION WAS ALWAYS EMPTY. The lookup went through db.session.get on
locationid and produced nothing even where a location is set; the printers list
has always read it through the asset relationship, so the card does too now.

WARRANTY ROWS are identified the way the floor identifies them: the PC's
hostname and the MACHINE it drives, reusing the same lookup behind the warranty
page's machine column so the board and the report cannot disagree about which
bay a PC belongs to. No dates - expired or expiring is the whole decision when
scanning a board, and the exact day belongs on the report you order from.

NOTIFICATIONS are stacked: the type in full on one line, the message beneath,
trimmed to 100 characters with the rest on hover. Inline, the type was
truncated to make room for prose that was then truncated anyway, and neither
read. A tooltip is omitted when the text was not trimmed, because one repeating
what is already on screen is noise.

Two general additions: layout: 'stacked' on a card, and map.detailtooltip.

plugins/printers/api/asset_routes.py

@@ -1020,12 +1020,11 @@ def _get_low_supplies_data():
 
         if has_low:
             # location name for the report row
-            location_name = None
-            if asset.locationid:
-                from shopdb.api import Location
-                loc = db.session.get(Location, asset.locationid)
-                if loc:
-                    location_name = loc.locationname
+            # Via the relationship, the way the printers list does it. The
+            # previous lookup went through db.session.get on locationid, and
+            # every row came back with no location even where one is set.
+            location_name = (asset.location.locationname
+                             if asset.location else None)
 
             results.append({
                 'printerid': printer.printerid,
@@ -1441,27 +1440,37 @@ def dashboard_supplies():
     """
     data = _get_low_supplies_data()
 
+    threshold = 5
+    setting = Setting.query.filter_by(key='printers_dashboardpercent').first()
+    if setting and (setting.value or '').strip():
+        try:
+            threshold = int(setting.value)
+        except (TypeError, ValueError):
+            pass
+
     rows = []
     for printer in data.get('printers', []):
-        criticals = [s for s in printer['supplies'] if s['status'] == 'critical']
-        lows = [s for s in printer['supplies'] if s['status'] == 'low']
-        if not criticals and not lows:
+        # The CARD is tighter than the report. The report lists anything the
+        # thresholds call low, which is the right scope for planning an order;
+        # the dashboard is asking what to walk out and change today, and a
+        # cartridge at 18% is not that. Anything at or below the threshold.
+        depleted = [supply for supply in printer['supplies']
+                    if isinstance(supply.get('remaining'), (int, float))
+                    and supply['remaining'] <= threshold]
+        if not depleted:
             continue
-        # Criticals first. Every depleted supply is listed, not just the worst
-        # class - whoever walks out there wants to carry both cartridges.
+        depleted.sort(key=lambda supply: supply['remaining'])
         rows.append({
             'printerid': printer['printerid'],
             'printername': printer['printername'] or printer['assetnumber'],
             'location': printer['location'] or 'No location set',
-            'iscritical': bool(criticals),
-            # One chip per depleted supply: what is low, and on hover what to
-            # order to fix it.
+            'iscritical': any(s['status'] == 'critical' for s in depleted),
             'supplies': [{
                 'text': '{} {}%'.format(_shortsupplyname(supply.get('name')),
                                         supply.get('remaining')),
                 'title': _reordertip(supply),
                 'level': supply.get('status'),
-            } for supply in criticals + lows],
+            } for supply in depleted],
         })
 
     rows.sort(key=lambda r: (not r['iscritical'], r['printername']))