Fix isFed state for regular plan comparison line, simplified urin ph selection

src/components/settings.tsx

@@ -46,7 +46,6 @@ const getDefaultsForTranslation = (pkParams: any, therapeuticRange: any, uiSetti
     standardVdPreset: defaults.pkParams.advanced.standardVd?.preset || 'adult',
     bodyWeight: defaults.pkParams.advanced.weightBasedVd.bodyWeight,
     tmaxDelay: defaults.pkParams.advanced.foodEffect.tmaxDelay,
-    phTendency: defaults.pkParams.advanced.urinePh.phTendency,
     fOral: defaults.pkParams.advanced.fOral,
     fOralPercent: String((parseFloat(defaults.pkParams.advanced.fOral) * 100).toFixed(1)),
     steadyStateDays: defaults.pkParams.advanced.steadyStateDays,
@@ -924,12 +923,7 @@ const Settings = ({
             {/* Urine pH */}
             <div className="space-y-3">
               <div className="flex items-center gap-3">
-                <Switch
+                <Label htmlFor="urinePHMode" className="font-medium">
-                  id="urinePHEnabled"
-                  checked={pkParams.advanced.urinePh.enabled}
-                  onCheckedChange={checked => updateAdvanced('urinePh', 'enabled', checked)}
-                />
-                <Label htmlFor="urinePHEnabled" className="font-medium">
                   {t('urinePHTendency')}
                 </Label>
                   <Tooltip open={openTooltipId === 'urinePH'} onOpenChange={(open) => setOpenTooltipId(open ? 'urinePH' : null)}>
@@ -949,38 +943,23 @@ const Settings = ({
                     </TooltipContent>
                   </Tooltip>
               </div>
-              {pkParams.advanced.urinePh.enabled && (
+              <div>
-                <div className="ml-8 space-y-2">
+                <Select
-                  <div className="flex items-center gap-2">
+                  value={pkParams.advanced.urinePh.mode}
-                    <Label className="text-sm font-medium">{t('urinePHValue')}</Label>
+                  onValueChange={(value: 'normal' | 'acidic' | 'alkaline') =>
-                      <Tooltip open={openTooltipId === 'urinePHValue'} onOpenChange={(open) => setOpenTooltipId(open ? 'urinePHValue' : null)}>
+                    updateAdvanced('urinePh', 'mode', value)
-                    <TooltipTrigger asChild>
+                  }
-                      <button
+                >
-                        type="button"
+                  <SelectTrigger id="urinePHMode">
-                        onClick={handleTooltipToggle('urinePHValue')}
+                    <SelectValue />
-                        onTouchStart={handleTooltipToggle('urinePHValue')}
+                  </SelectTrigger>
-                        className="inline-flex items-center justify-center rounded-sm text-muted-foreground hover:text-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
+                  <SelectContent>
-                        aria-label={t('urinePHValueTooltip')}
+                    <SelectItem value="normal">{t('urinePHModeNormal')}</SelectItem>
-                      >
+                    <SelectItem value="acidic">{t('urinePHModeAcidic')}</SelectItem>
-                            <Info className="h-4 w-4" />
+                    <SelectItem value="alkaline">{t('urinePHModeAlkaline')}</SelectItem>
-                          </button>
+                  </SelectContent>
-                        </TooltipTrigger>
+                </Select>
-                        <TooltipContent side={tooltipSide}>
+              </div>
-                          <p className="text-xs max-w-xs">{tWithDefaults(t, 'urinePHValueTooltip', defaultsForT)}</p>
-                        </TooltipContent>
-                      </Tooltip>
-                  </div>
-                  <FormNumericInput
-                    value={pkParams.advanced.urinePh.phTendency}
-                    onChange={val => updateAdvanced('urinePh', 'phTendency', val)}
-                    increment={0.1}
-                    min={5.5}
-                    max={8.0}
-                    unit={t('phUnit')}
-                    required={true}
-                  />
-                </div>
-              )}
             </div>
 
             <Separator className="my-4" />

src/constants/defaults.ts

@@ -26,7 +26,7 @@ const versionInfo = versionJsonDefault && Object.keys(versionJsonDefault).length
       gitDate: 'unknown',
     };
 
-export const LOCAL_STORAGE_KEY = 'medPlanAssistantState_v8'; // Incremented for ageGroup + renalFunction fields
+export const LOCAL_STORAGE_KEY = 'medPlanAssistantState_v9'; // Incremented for urinePh mode structure change
 export const PROJECT_REPOSITORY_URL = 'https://git.11001001.org/cbaoth/med-plan-assistant';
 export const APP_VERSION = versionInfo.version;
 export const BUILD_INFO = versionInfo;
@@ -42,7 +42,7 @@ export interface AdvancedSettings {
   standardVd: { preset: 'adult' | 'child' | 'custom'; customValue: string }; // Volume of distribution (L)
   weightBasedVd: { enabled: boolean; bodyWeight: string }; // kg
   foodEffect: { enabled: boolean; tmaxDelay: string }; // hours
-  urinePh: { enabled: boolean; phTendency: string }; // 5.5-8.0 range
+  urinePh: { mode: 'normal' | 'acidic' | 'alkaline' }; // pH effect on elimination
   fOral: string; // bioavailability fraction
   steadyStateDays: string; // days of medication history to simulate
   // Age-specific pharmacokinetics (Research Section 5.2)
@@ -141,7 +141,7 @@ export const getDefaultState = (): AppState => ({
       standardVd: { preset: 'adult', customValue: '377' }, // Adult: 377L (Roberts 2015), Child: ~150-200L
       weightBasedVd: { enabled: false, bodyWeight: '70' }, // kg, adult average
       foodEffect: { enabled: false, tmaxDelay: '1.0' }, // hours delay
-      urinePh: { enabled: false, phTendency: '6.0' }, // pH scale (5.5-8.0)
+      urinePh: { mode: 'normal' }, // 'normal' (6-7.5), 'acidic' (<6), 'alkaline' (>7.5)
       fOral: String(DEFAULT_F_ORAL), // 0.96 bioavailability
       steadyStateDays: '7' // days of prior medication history
     }

src/hooks/useAppState.ts

@@ -29,10 +29,35 @@ export const useAppState = () => {
           migratedUiSettings.showDayTimeOnXAxis = migratedUiSettings.showDayTimeOnXAxis ? '24h' : 'continuous';
         }
 
+        // Migrate urinePh from old {enabled, phTendency} to new {mode} structure
+        let migratedPkParams = {...defaults.pkParams, ...parsedState.pkParams};
+        if (migratedPkParams.advanced) {
+          const oldUrinePh = migratedPkParams.advanced.urinePh as any;
+          if (oldUrinePh && typeof oldUrinePh === 'object' && 'enabled' in oldUrinePh) {
+            // Old format detected: {enabled: boolean, phTendency: string}
+            if (!oldUrinePh.enabled) {
+              migratedPkParams.advanced.urinePh = { mode: 'normal' };
+            } else {
+              const phValue = parseFloat(oldUrinePh.phTendency);
+              if (!isNaN(phValue)) {
+                if (phValue < 6.0) {
+                  migratedPkParams.advanced.urinePh = { mode: 'acidic' };
+                } else if (phValue > 7.5) {
+                  migratedPkParams.advanced.urinePh = { mode: 'alkaline' };
+                } else {
+                  migratedPkParams.advanced.urinePh = { mode: 'normal' };
+                }
+              } else {
+                migratedPkParams.advanced.urinePh = { mode: 'normal' };
+              }
+            }
+          }
+        }
+
         setAppState({
           ...defaults,
           ...parsedState,
-          pkParams: {...defaults.pkParams, ...parsedState.pkParams},
+          pkParams: migratedPkParams,
           days: parsedState.days || defaults.days,
           uiSettings: migratedUiSettings,
         });

src/hooks/useSimulation.ts

@@ -72,7 +72,8 @@ export const useSimulation = (appState: AppState) => {
       doses: templateDay.doses.map(d => ({
         id: `${d.id}-template-${i}`,
         time: d.time,
-        ldx: d.ldx
+        ldx: d.ldx,
+        isFed: d.isFed // Preserve food-timing flag for proper absorption delay modeling
       }))
     }));
 

src/locales/de.ts

@@ -135,7 +135,11 @@ export const de = {
   tmaxDelayUnit: "h",
 
   urinePHTendency: "Urin-pH-Effekte",
-  urinePHTooltip: "Urin-pH beeinflusst Nierenrückresorption von Amphetamin. Ermöglicht pH-abhängige Halbwertszeit-Variation (7-15h Bereich). Bei Deaktivierung: neutraler pH (~11h HWZ).",
+  urinePHTooltip: "Urin-pH beeinflusst Nierenrückresorption von Amphetamin. Saurer Urin (<6) erhöht Elimination (schnellere Ausscheidung, t½ ~7-9h). Normaler pH (6-7,5) hält Basis-Elimination (~11h). Alkalischer Urin (>7,5) reduziert Elimination (langsamere Ausscheidung, t½ ~13-15h). Typischer Bereich: 5,5-8,0. Standard: Normaler pH (6-7,5).",
+  urinePHMode: "pH-Effekt",
+  urinePHModeNormal: "Normal (pH 6-7,5, t½ 11h)",
+  urinePHModeAcidic: "Sauer (pH <6, schnellere Elimination)",
+  urinePHModeAlkaline: "Alkalisch (pH >7,5, langsamere Elimination)",
   urinePHValue: "pH-Wert",
   urinePHValueTooltip: "Dein typischer Urin-pH (sauer=schnellere Ausscheidung, alkalisch=langsamer). Standard: {{phTendency}}. Bereich: 5,5-8,0.",
   phValue: "pH-Wert",

src/locales/en.ts

@@ -133,7 +133,11 @@ export const en = {
   tmaxDelayUnit: "h",
 
   urinePHTendency: "Urine pH Effects",
-  urinePHTooltip: "Urine pH affects kidney reabsorption of amphetamine. Enables pH-dependent half-life variation (7-15h range). When disabled, assumes neutral pH (~11h HL).",
+  urinePHTooltip: "Urine pH affects kidney reabsorption of amphetamine. Acidic urine (<6) increases elimination (faster clearance, t½ ~7-9h). Normal pH (6-7.5) maintains baseline elimination (~11h). Alkaline urine (>7.5) reduces elimination (slower clearance, t½ ~13-15h). Typical range: 5.5-8.0. Default: Normal pH (6-7.5).",
+  urinePHMode: "pH Effect",
+  urinePHModeNormal: "Normal (pH 6-7.5, t½ 11h)",
+  urinePHModeAcidic: "Acidic (pH <6, faster elimination)",
+  urinePHModeAlkaline: "Alkaline (pH >7.5, slower elimination)",
   urinePHValue: "pH Value",
   urinePHValueTooltip: "Your typical urine pH (acidic=faster clearance, alkaline=slower). Default: {{phTendency}}. Range: 5.5-8.0.",
   phValue: "pH Value",

src/utils/exportImport.ts

@@ -250,6 +250,7 @@ export const importSettings = (
         time: dose.time || '12:00',
         ldx: dose.ldx || '0',
         damph: dose.damph,
+        isFed: dose.isFed, // Explicitly preserve food-timing flag
       }))
     }));
   }

src/utils/pharmacokinetics.ts

@@ -108,8 +108,7 @@ export const calculateSingleDoseConcentration = (
   // Per-dose food effect takes precedence over global setting
   const foodEnabled = isFed !== undefined ? isFed : pkParams.advanced.foodEffect.enabled;
   const tmaxDelay = foodEnabled ? parseFloat(pkParams.advanced.foodEffect.tmaxDelay) : 0;
-  const urinePHEnabled = pkParams.advanced.urinePh.enabled;
+  const urinePHMode = pkParams.advanced.urinePh.mode;
-  const phTendency = urinePHEnabled ? parseFloat(pkParams.advanced.urinePh.phTendency) : 6.0;
 
   // Validate base parameters
   if (isNaN(absorptionHalfLife) || absorptionHalfLife <= 0 ||
@@ -125,20 +124,18 @@ export const calculateSingleDoseConcentration = (
   const calculationTime = adjustedTime; // Use delayed time for all kinetic calculations
 
   // Apply urine pH effect on elimination half-life
-  // pH < 6: acidic (faster elimination, HL ~7-9h)
+  // Acidic: pH < 6 (faster elimination, HL ~7-9h)
-  // pH 6-7: normal (HL ~10-12h)
+  // Normal: pH 6-7.5 (baseline elimination, HL ~10-12h)
-  // pH > 7: alkaline (slower elimination, HL ~13-15h up to 34h extreme)
+  // Alkaline: pH > 7.5 (slower elimination, HL ~13-15h up to 34h extreme)
   let adjustedDamphHL = damphHalfLife;
-  if (urinePHEnabled) {
+  if (urinePHMode === 'acidic') {
-    if (phTendency < 6.0) {
+    // Acidic: reduce HL by ~30%
-      // Acidic: reduce HL by ~30%
+    adjustedDamphHL = damphHalfLife * 0.7;
-      adjustedDamphHL = damphHalfLife * 0.7;
+  } else if (urinePHMode === 'alkaline') {
-    } else if (phTendency > 7.5) {
+    // Alkaline: increase HL by ~30-40%
-      // Alkaline: increase HL by ~30-40%
+    adjustedDamphHL = damphHalfLife * 1.35;
-      adjustedDamphHL = damphHalfLife * 1.35;
-    }
-    // else: normal pH 6-7.5, no adjustment
   }
+  // else: normal mode, no adjustment
 
   // Calculate rate constants
   const ka_ldx = Math.log(2) / absorptionHalfLife;