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frontend/src/components/Applications/ApplicationPlanModal.js

@@ -20,7 +20,7 @@ const ApplicationPlanModal = ({
   const [selectedNozzleId, setSelectedNozzleId] = useState('');
   const [selectedProducts, setSelectedProducts] = useState([]);
   const [applicationType, setApplicationType] = useState('');
-  const [plannedDate, setPlannedDate] = useState('');
+  const [plannedDate, setPlannedDate] = useState(new Date().toISOString().split('T')[0]);
   const [notes, setNotes] = useState('');
   const [loading, setLoading] = useState(false);
   const [spreaderSettings, setSpreaderSettings] = useState({});
@@ -356,45 +356,59 @@ const ApplicationPlanModal = ({
       return total + (area?.area || 0);
     }, 0);
     
+    const totalAreaSquareMeters = totalArea * 0.092903; // Convert sq ft to sq meters
+    
+    let waterNeeded = 0;
+    
+    // For liquid applications, calculate water needed once for all products
+    if (applicationType === 'liquid' && selectedNozzleId && selectedEquipmentId) {
+      const selectedNozzle = nozzles.find(n => n.id === parseInt(selectedNozzleId));
+      const selectedEquipment = equipment.find(eq => eq.id === parseInt(selectedEquipmentId));
+      
+      if (selectedNozzle && selectedEquipment && selectedNozzle.flowRateGpm && selectedEquipment.sprayWidthFeet) {
+        // Convert units
+        const flowRateLPM = selectedNozzle.flowRateGpm * 3.78541; // GPM to L/min
+        const widthMeters = selectedEquipment.sprayWidthFeet * 0.3048; // feet to meters
+        const speedMPM = 107.29; // Assumed speed in meters/minute (4 km/h)
+        
+        // Carrier application rate: Rate (L/m²) = flow (L/min) / (width (m) × speed (m/min))
+        const carrierRate = flowRateLPM / (widthMeters * speedMPM);
+        
+        // Total water needed = carrier rate × total area
+        const waterNeededLiters = carrierRate * totalAreaSquareMeters;
+        waterNeeded = waterNeededLiters * 0.264172; // Convert liters to gallons
+      }
+    }
+    
     const calculations = selectedProducts.map(product => {
       const rateAmount = parseFloat(product.rateAmount) || 0;
-      const areaIn1000s = totalArea / 1000;
       
       if (product.productType === 'granular') {
-        // Granular calculations
+        // Granular calculations - total product needed
-        const totalProductNeeded = rateAmount * areaIn1000s;
+        const totalProductNeeded = (rateAmount * totalArea) / 1000; // Rate is per 1000 sq ft
         return {
           productName: product.productName,
           totalProductNeeded: totalProductNeeded.toFixed(2),
-          unit: product.rateUnit,
+          unit: product.rateUnit?.replace('/1000sqft', '').replace('/1000 sq ft', '') || 'lbs',
           waterNeeded: 0 // No water for granular
         };
       } else {
-        // Liquid calculations
+        // Liquid calculations - total product needed
-        const totalProductNeeded = rateAmount * areaIn1000s;
+        const totalProductNeeded = (rateAmount * totalArea) / 1000; // Rate is per 1000 sq ft
-        
-        // Calculate water needed based on nozzle and equipment settings
-        let waterNeeded = 0;
-        if (selectedNozzleId) {
-          const selectedNozzle = nozzles.find(n => n.id === parseInt(selectedNozzleId));
-          if (selectedNozzle && selectedNozzle.flowRateGpm) {
-            // Basic calculation - this would need equipment speed settings for accuracy
-            waterNeeded = (selectedNozzle.flowRateGpm * 60 * areaIn1000s) / 1000; // Rough estimate
-          }
-        }
         
         return {
           productName: product.productName,
           totalProductNeeded: totalProductNeeded.toFixed(2),
-          unit: product.rateUnit,
+          unit: product.rateUnit?.replace('/1000sqft', '').replace('/1000 sq ft', '') || 'oz',
-          waterNeeded: waterNeeded.toFixed(1)
+          waterNeeded: 0 // Water calculated separately for liquid
         };
       }
     });
     
     return {
       totalArea: totalArea.toLocaleString(),
-      calculations
+      calculations,
+      waterNeeded: waterNeeded > 0 ? waterNeeded.toFixed(1) : 0
     };
   };
 
@@ -805,9 +819,13 @@ const ApplicationPlanModal = ({
                         <div key={index} className="mb-2">
                           <p className="font-medium">{calc.productName}:</p>
                           <p className="ml-2">Product needed: {calc.totalProductNeeded} {calc.unit}</p>
-                          {calc.waterNeeded > 0 && <p className="ml-2">Water needed: {calc.waterNeeded} gallons</p>}
                         </div>
                       ))}
+                      {applicationType === 'liquid' && calculations.waterNeeded > 0 && (
+                        <div className="mt-2 pt-2 border-t border-blue-200">
+                          <p className="font-medium">Water needed: {calculations.waterNeeded} gallons</p>
+                        </div>
+                      )}
                     </div>
                   </div>
                 ) : null;