Fix unit conversion logic

src/components/admin/editors/CoasterStatsEditor.tsx

@@ -10,7 +10,8 @@ import {
   convertValueToMetric, 
   convertValueFromMetric, 
   detectUnitType,
-  getMetricUnit
+  getMetricUnit,
+  getDisplayUnit
 } from "@/lib/units";
 
 interface CoasterStat {
@@ -86,7 +87,7 @@ export function CoasterStatsEditor({
     onChange(newStats);
   };
 
-  // Get display value (convert from metric if needed)
+  // Get display value (convert from metric to user's preferred units)
   const getDisplayValue = (stat: CoasterStat): string => {
     if (!stat.stat_value || !stat.unit) return String(stat.stat_value || '');
     
@@ -96,9 +97,12 @@ export function CoasterStatsEditor({
     const unitType = detectUnitType(stat.unit);
     if (unitType === 'unknown') return String(stat.stat_value);
     
-    // Assume stored value is in metric, convert to user's preferred units
-    const metricUnit = getMetricUnit(stat.unit);
-    const displayValue = convertValueFromMetric(numValue, stat.unit, metricUnit);
+    // stat.unit is the metric unit (e.g., "km/h")
+    // Get the display unit based on user preference (e.g., "mph" for imperial)
+    const displayUnit = getDisplayUnit(stat.unit, preferences.measurement_system);
+    
+    // Convert from metric to display unit
+    const displayValue = convertValueFromMetric(numValue, displayUnit, stat.unit);
     
     return String(displayValue);
   };
@@ -157,24 +161,25 @@ export function CoasterStatsEditor({
                       value={getDisplayValue(stat)}
                       onChange={(e) => {
                         const inputValue = e.target.value;
-                        // If unit is recognized, convert to metric for storage
-                        if (stat.unit) {
-                          const numValue = parseFloat(inputValue);
-                          if (!isNaN(numValue)) {
-                            const metricValue = convertValueToMetric(numValue, stat.unit);
-                            updateStat(index, 'stat_value', metricValue);
-                          } else {
-                            updateStat(index, 'stat_value', 0);
-                          }
+                        const numValue = parseFloat(inputValue);
+                        
+                        if (!isNaN(numValue) && stat.unit) {
+                          // Determine what unit the user is entering (based on their preference)
+                          const displayUnit = getDisplayUnit(stat.unit, preferences.measurement_system);
+                          // Convert from user's input unit to metric for storage
+                          const metricValue = convertValueToMetric(numValue, displayUnit);
+                          updateStat(index, 'stat_value', metricValue);
                         } else {
-                          updateStat(index, 'stat_value', parseFloat(inputValue) || 0);
+                          updateStat(index, 'stat_value', numValue || 0);
                         }
                       }}
                       placeholder="0"
                     />
-                    <p className="text-xs text-muted-foreground mt-1">
-                      Using {preferences.measurement_system} units
-                    </p>
+                    {stat.unit && detectUnitType(stat.unit) !== 'unknown' && (
+                      <p className="text-xs text-muted-foreground mt-1">
+                        Enter in {getDisplayUnit(stat.unit, preferences.measurement_system)}
+                      </p>
+                    )}
                   </div>
                   <div>
                     <Label className="text-xs">Unit</Label>

src/components/admin/editors/TechnicalSpecsEditor.tsx

@@ -9,7 +9,8 @@ import {
   convertValueToMetric, 
   convertValueFromMetric, 
   detectUnitType,
-  getMetricUnit 
+  getMetricUnit,
+  getDisplayUnit
 } from "@/lib/units";
 
 interface TechnicalSpec {
@@ -65,7 +66,7 @@ export function TechnicalSpecsEditor({
     onChange(newSpecs);
   };
 
-  // Get display value (convert from metric if needed)
+  // Get display value (convert from metric to user's preferred units)
   const getDisplayValue = (spec: TechnicalSpec): string => {
     if (!spec.spec_value || !spec.unit || spec.spec_type !== 'number') return spec.spec_value;
     
@@ -75,9 +76,12 @@ export function TechnicalSpecsEditor({
     const unitType = detectUnitType(spec.unit);
     if (unitType === 'unknown') return spec.spec_value;
     
-    // Assume stored value is in metric, convert to user's preferred units
-    const metricUnit = getMetricUnit(spec.unit);
-    const displayValue = convertValueFromMetric(numValue, spec.unit, metricUnit);
+    // spec.unit is the metric unit (e.g., "km/h")
+    // Get the display unit based on user preference (e.g., "mph" for imperial)
+    const displayUnit = getDisplayUnit(spec.unit, preferences.measurement_system);
+    
+    // Convert from metric to display unit
+    const displayValue = convertValueFromMetric(numValue, displayUnit, spec.unit);
     
     return String(displayValue);
   };
@@ -135,15 +139,15 @@ export function TechnicalSpecsEditor({
                     value={getDisplayValue(spec)}
                     onChange={(e) => {
                       const inputValue = e.target.value;
+                      const numValue = parseFloat(inputValue);
+                      
                       // If type is number and unit is recognized, convert to metric for storage
-                      if (spec.spec_type === 'number' && spec.unit) {
-                        const numValue = parseFloat(inputValue);
-                        if (!isNaN(numValue)) {
-                          const metricValue = convertValueToMetric(numValue, spec.unit);
-                          updateSpec(index, 'spec_value', String(metricValue));
-                        } else {
-                          updateSpec(index, 'spec_value', inputValue);
-                        }
+                      if (spec.spec_type === 'number' && spec.unit && !isNaN(numValue)) {
+                        // Determine what unit the user is entering (based on their preference)
+                        const displayUnit = getDisplayUnit(spec.unit, preferences.measurement_system);
+                        // Convert from user's input unit to metric for storage
+                        const metricValue = convertValueToMetric(numValue, displayUnit);
+                        updateSpec(index, 'spec_value', String(metricValue));
                       } else {
                         updateSpec(index, 'spec_value', inputValue);
                       }
@@ -151,9 +155,9 @@ export function TechnicalSpecsEditor({
                     placeholder="Value"
                     type={spec.spec_type === 'number' ? 'number' : 'text'}
                   />
-                  {spec.spec_type === 'number' && spec.unit && (
+                  {spec.spec_type === 'number' && spec.unit && detectUnitType(spec.unit) !== 'unknown' && (
                     <p className="text-xs text-muted-foreground mt-1">
-                      Using {preferences.measurement_system} units
+                      Enter in {getDisplayUnit(spec.unit, preferences.measurement_system)}
                     </p>
                   )}
                 </div>

src/lib/units.ts

@@ -204,4 +204,22 @@ export function getMetricUnit(unit: string): string {
     default:
       return unit;
   }
+}
+
+// Get display unit based on unit type and measurement system
+export function getDisplayUnit(metricUnit: string, system: MeasurementSystem): string {
+  const unitType = detectUnitType(metricUnit);
+  
+  switch (unitType) {
+    case 'speed':
+      return system === 'imperial' ? 'mph' : 'km/h';
+    case 'distance':
+      return system === 'imperial' ? 'ft' : 'm';
+    case 'height':
+      return system === 'imperial' ? 'in' : 'cm';
+    case 'weight':
+      return system === 'imperial' ? 'lbs' : 'kg';
+    default:
+      return metricUnit;
+  }
 }