Implement derived grow check rules, auto-fix behaviors, and import hardening

src/App.tsx

@@ -348,6 +348,21 @@ function BuilderApp() {
       if (ids.length >= 2) {
         s.removeParts([ids[1]]);
       }
+    } else if (finding.id.startsWith('nutrient-depletion:')) {
+      const resId = finding.partIds[0];
+      if (resId) {
+        const p = s.parts[resId];
+        if (p) {
+          s.updatePart(resId, {
+            params: {
+              ...p.params,
+              width: Math.min(5, (p.params.width ?? 2) * 1.5),
+              depth: Math.min(4, (p.params.depth ?? 1.4) * 1.5),
+              height: Math.min(3, (p.params.height ?? 1) * 1.2),
+            }
+          });
+        }
+      }
     } else if (finding.id.startsWith('orphan:')) {
       s.removeParts(finding.partIds);
     }

src/store/builderStore.ts

@@ -1016,8 +1016,15 @@ export const useBuilder = create<BuilderStore>((set, get) => ({
     const s = get();
     if (!pasted.length) return [];
 
-    // Rigorously validate and sanitize each pasted part
+    const sanitized: PlacedPart[] = [];
-    const sanitized = pasted.map((p) => sanitizePart(p));
+    for (const p of pasted) {
+      try {
+        sanitized.push(sanitizePart(p));
+      } catch (err) {
+        console.warn('Skipping corrupted part during paste:', p, err);
+      }
+    }
+    if (!sanitized.length) return [];
 
     s.pushHistory('paste');
     const offset: Vec3 = [1, 0, 1];

src/utils/serializer.ts

@@ -104,7 +104,7 @@ export function parseProjectFile(raw: unknown): ProjectFile {
     try {
       validatedParts.push(sanitizePart(p));
     } catch (err) {
-      throw new Error(`Project file validation failed: ${(err as Error).message}`);
+      console.warn('Skipping corrupted part during import:', p, err);
     }
   }
 

src/validation/DesignCheckPanel.tsx

@@ -68,10 +68,35 @@ function FindingCard({
   onApplyFix?: (finding: Finding) => void;
 }) {
   const meta = SEVERITY_META[finding.severity];
-  const canApplyFix =
+  const fixablePrefixes = [
-    finding.id.startsWith('dead-leg:') ||
+    'dead-leg:',
-    finding.id.startsWith('diameter-mismatch:') ||
+    'diameter-mismatch:',
-    finding.id.startsWith('pump-dead:');
+    'pump-dead:',
+    'pump-head:',
+    'unsupported-span:',
+    'drain-capacity:',
+    'res-temp-high:',
+    'res-ph-low:',
+    'res-ph-high:',
+    'res-ec-low:',
+    'res-ec-high:',
+    'room-co2-open:',
+    'room-co2-missing:',
+    'room-co2-starved:',
+    'room-sealed-exhaust:',
+    'room-vent-low:',
+    'room-light-low:',
+    'room-light-high:',
+    'room-dli-low:',
+    'room-dli-high:',
+    'room-vpd-low:',
+    'room-vpd-high:',
+    'closed-valve:',
+    'part-overlap:',
+    'orphan:',
+    'nutrient-depletion:',
+  ];
+  const canApplyFix = fixablePrefixes.some((prefix) => finding.id.startsWith(prefix));
   return (
     <div className={`rounded-lg border px-3 py-2.5 ${meta.card}`}>
       <div className="flex items-start gap-2">

src/validation/rules.ts

@@ -703,6 +703,21 @@ export const ALL_RULES: ValidationRule[] = [
     description: 'Parts that are overlapping or morphing into one another.',
     run: partOverlaps,
   },
+  {
+    id: 'structural-floor-load',
+    description: 'Total equipment and water load per square foot of room footprint.',
+    run: structuralFloorLoad,
+  },
+  {
+    id: 'nutrient-depletion',
+    description: 'Reservoir buffer volume capacity relative to plant count.',
+    run: nutrientDepletion,
+  },
+  {
+    id: 'manifold-imbalance',
+    description: 'Uniformity of delivered flow rates across multiple emitters.',
+    run: manifoldImbalance,
+  },
 ];
 
 function reservoirWaterChemistry(ctx: RuleContext): Finding[] {
@@ -883,3 +898,212 @@ function partOverlaps(ctx: RuleContext): Finding[] {
   }
   return findings;
 }
+
+function structuralFloorLoad(ctx: RuleContext): Finding[] {
+  const findings: Finding[] = [];
+  const rooms = new Set<string>();
+  for (const p of ctx.parts) {
+    if (p.roomId) rooms.add(p.roomId);
+  }
+  if (rooms.size === 0) rooms.add('room-1');
+
+  for (const roomId of rooms) {
+    const roomParts = ctx.parts.filter((p) => (p.roomId || 'room-1') === roomId);
+    if (roomParts.length === 0) continue;
+
+    let totalWeight = 0;
+    let minX = Infinity;
+    let maxX = -Infinity;
+    let minZ = Infinity;
+    let maxZ = -Infinity;
+
+    for (const p of roomParts) {
+      if (p.type !== 'growTent') {
+        minX = Math.min(minX, p.position[0]);
+        maxX = Math.max(maxX, p.position[0]);
+        minZ = Math.min(minZ, p.position[2]);
+        maxZ = Math.max(maxZ, p.position[2]);
+      }
+
+      let dryWeight = 1;
+      if (p.type === 'reservoir') dryWeight = 15;
+      else if (p.type === 'tray') dryWeight = 10;
+      else if (p.type === 'pump') dryWeight = 5;
+      else if (p.type === 'waterChiller') dryWeight = 35;
+      else if (p.type === 'growLight') dryWeight = 12;
+      else if (p.type === 'inlineFan') dryWeight = 8;
+      else if (p.type === 'circulationFan') dryWeight = 3;
+      else if (p.type === 'co2Tank') dryWeight = 30;
+      else if (p.type === 'tower') dryWeight = 12;
+
+      let waterWeight = 0;
+      if (p.type === 'reservoir') {
+        const w = p.params.width ?? 2;
+        const d = p.params.depth ?? 1.4;
+        const h = p.params.height ?? 1;
+        const gallons = w * d * h * 7.48;
+        waterWeight = gallons * 8.34;
+      } else if (p.type === 'tray') {
+        const l = p.params.length ?? 3;
+        const w = p.params.width ?? 1.2;
+        const gallons = l * w * 0.1 * 7.48;
+        waterWeight = gallons * 8.34;
+      } else if (p.type === 'pipe') {
+        const d = p.params.diameter ?? 1.0;
+        const len = p.params.length ?? 2;
+        const r = 0.05 + d * 0.055;
+        const volFt3 = Math.PI * r * r * len;
+        waterWeight = volFt3 * 7.48 * 8.34;
+      }
+
+      totalWeight += dryWeight + waterWeight;
+    }
+
+    if (totalWeight <= 20) continue;
+
+    const dx = maxX - minX;
+    const dz = maxZ - minZ;
+    const footprintArea = Math.max(4, (dx > 0 ? dx : 2) * (dz > 0 ? dz : 2));
+    const floorPressure = totalWeight / footprintArea;
+
+    const tent = roomParts.find((p) => p.type === 'growTent');
+    const roomName = tent ? (tent.label || 'Grow Tent') : `Room (${roomId === 'room-1' ? 'Room 1' : roomId})`;
+
+    if (floorPressure > 60) {
+      findings.push({
+        id: `floor-weight:${roomId}`,
+        severity: 'error',
+        title: 'Critical floor weight loading',
+        detail: `${roomName} total weight is ${totalWeight.toFixed(0)} lbs over ${footprintArea.toFixed(1)} sq ft, resulting in a load of ${floorPressure.toFixed(1)} lbs/sq ft. This exceeds standard residential ceiling/loft safety limits (40 lbs/sq ft).`,
+        partIds: roomParts.filter(p => p.type === 'reservoir' || p.type === 'tray').map(p => p.id),
+        fix: 'Reduce reservoir sizes, split the load across multiple rooms, or move the layout to a ground/concrete slab floor.',
+      });
+    } else if (floorPressure > 40) {
+      findings.push({
+        id: `floor-weight:${roomId}`,
+        severity: 'warning',
+        title: 'High floor weight loading',
+        detail: `${roomName} total weight is ${totalWeight.toFixed(0)} lbs over ${footprintArea.toFixed(1)} sq ft, resulting in a load of ${floorPressure.toFixed(1)} lbs/sq ft. This is near the standard 40 lbs/sq ft residential loft load rating limit.`,
+        partIds: roomParts.filter(p => p.type === 'reservoir' || p.type === 'tray').map(p => p.id),
+        fix: 'Ensure your floor has structural joist support directly under the heavy reservoirs, or reduce reservoir water levels.',
+      });
+    } else {
+      findings.push({
+        id: `floor-weight:${roomId}`,
+        severity: 'info',
+        title: 'Floor weight loading normal',
+        detail: `${roomName} total weight is ${totalWeight.toFixed(0)} lbs over ${footprintArea.toFixed(1)} sq ft, resulting in a safe load of ${floorPressure.toFixed(1)} lbs/sq ft.`,
+        partIds: roomParts.filter(p => p.type === 'reservoir' || p.type === 'tray').map(p => p.id),
+      });
+    }
+  }
+
+  return findings;
+}
+
+function nutrientDepletion(ctx: RuleContext): Finding[] {
+  const findings: Finding[] = [];
+  const reservoirs = ctx.parts.filter((p) => p.type === 'reservoir');
+
+  for (const res of reservoirs) {
+    const w = res.params.width ?? 2;
+    const d = res.params.depth ?? 1.4;
+    const h = res.params.height ?? 1;
+    const gallons = w * d * h * 7.48;
+
+    const netPots = ctx.parts.filter(
+      (p) => (p.roomId || 'room-1') === (res.roomId || 'room-1') && (p.type === 'netPot' || p.type === 'tower')
+    );
+    const plantCount = netPots.length;
+    if (plantCount === 0) continue;
+
+    const gallonsPerPlant = gallons / plantCount;
+    const label = res.label || `Reservoir #${res.id}`;
+
+    if (gallonsPerPlant < 0.4) {
+      findings.push({
+        id: `nutrient-depletion:${res.id}`,
+        severity: 'error',
+        title: 'Critical reservoir size (EC/pH drift)',
+        detail: `${label} has only ${gallonsPerPlant.toFixed(2)} gal per plant site (Total: ${gallons.toFixed(0)} gal for ${plantCount} sites). Roots will suffer from severe nutrient depletion, water stress, and rapid pH drift.`,
+        partIds: [res.id],
+        fix: 'Increase reservoir size or reduce the number of plant sites in this room to achieve at least 1.0 gal/plant.',
+      });
+    } else if (gallonsPerPlant < 0.8) {
+      findings.push({
+        id: `nutrient-depletion:${res.id}`,
+        severity: 'warning',
+        title: 'High pH/EC drift risk',
+        detail: `${label} has ${gallonsPerPlant.toFixed(2)} gal per plant site. Hydroponic setups require at least 1.0 gal/plant to maintain chemical buffer stability. Expected daily pH/EC drift is high.`,
+        partIds: [res.id],
+        fix: 'Increase reservoir capacity or add a secondary top-off tank.',
+      });
+    } else if (gallonsPerPlant < 1.5) {
+      findings.push({
+        id: `nutrient-depletion:${res.id}`,
+        severity: 'info',
+        title: 'pH/EC drift warning',
+        detail: `${label} has ${gallonsPerPlant.toFixed(2)} gal per plant site. Monitor pH and nutrient strength (EC) daily as buffer levels are moderate.`,
+        partIds: [res.id],
+        fix: 'Recommended target is 2.0 gallons per plant site for hands-off stability.',
+      });
+    }
+  }
+
+  return findings;
+}
+
+function manifoldImbalance(ctx: RuleContext): Finding[] {
+  const findings: Finding[] = [];
+  if (!ctx.sim) return findings;
+
+  const rooms = new Set<string>();
+  for (const p of ctx.parts) {
+    if (p.roomId) rooms.add(p.roomId);
+  }
+  if (rooms.size === 0) rooms.add('room-1');
+
+  for (const roomId of rooms) {
+    const roomEmitters = ctx.parts.filter(
+      (p) => (p.roomId || 'room-1') === roomId && p.type === 'emitter'
+    );
+    if (roomEmitters.length < 2) continue;
+
+    const flows = roomEmitters
+      .map((e) => ctx.sim!.flows[e.id] ?? 0)
+      .filter((q) => q > 0);
+
+    if (flows.length < 2) continue;
+
+    const maxFlow = Math.max(...flows);
+    const minFlow = Math.min(...flows);
+    
+    const sum = flows.reduce((a, b) => a + b, 0);
+    const avg = sum / flows.length;
+    if (avg <= 0.01) continue;
+
+    const variancePct = ((maxFlow - minFlow) / avg) * 100;
+
+    if (variancePct > 50) {
+      findings.push({
+        id: `manifold-imbalance:${roomId}`,
+        severity: 'error',
+        title: 'Critical flow rate imbalance',
+        detail: `Manifold has a critical flow variance of ${variancePct.toFixed(0)}% between drip emitters (max: ${maxFlow.toFixed(1)} GPH, min: ${minFlow.toFixed(1)} GPH). Plants will experience severe uneven watering.`,
+        partIds: roomEmitters.map((e) => e.id),
+        fix: 'Use pressure-compensating emitters, balanced loops, or increase main pipe size to distribute pressure evenly.',
+      });
+    } else if (variancePct > 25) {
+      findings.push({
+        id: `manifold-imbalance:${roomId}`,
+        severity: 'warning',
+        title: 'Uneven emitter flow distribution',
+        detail: `Manifold has a flow variance of ${variancePct.toFixed(0)}% between drip emitters (max: ${maxFlow.toFixed(1)} GPH, min: ${minFlow.toFixed(1)} GPH). Some plants will receive more water than others.`,
+        partIds: roomEmitters.map((e) => e.id),
+        fix: 'Ensure the main manifold is looped or adjust pipe lengths to equalize pressure drop.',
+      });
+    }
+  }
+
+  return findings;
+}