fix autosensMax=1 crash for lowTTlowersSens

prevent loweringSens calculations with autosensMax=1
include information in Target Behaviour hints
prevent setting lowTTlowersSens with autoSensMax=1
alert re. autosensMax

essentially guarding twice against that crash now

Trio/Sources/Localizations/Main/Localizable.xcstrings

@@ -39505,6 +39505,9 @@
         }
       }
     },
+    "Cannot Enable This Setting" : {
+
+    },
     "Carb entries will be fully decayed by the number of hours specified as Max Meal Absorption Time. Meals that are high in fat and/or protein can have long lasting effects on BG levels. To allow such late meal effects to be considered by the carb decay model, a longer Max Meal Absorption Time than the default 6 hours can be set." : {
       "localizations" : {
         "ar" : {
@@ -156984,6 +156987,9 @@
         }
       }
     },
+    "This feature cannot be enabled unless Autosens Max > 100%." : {
+
+    },
     "This feature ensures more accurate insulin adjustments when carb entries are missing or incorrect." : {
       "localizations" : {
         "ar" : {
@@ -177430,6 +177436,7 @@
       }
     },
     "When this feature is enabled, setting a temporary target below %@ %@ will increase the Autosens Ratio used for ISF and basal adjustments, resulting in more insulin delivered overall. This scales with the temporary target set; the lower the Temp Target, the higher the Autosens Ratio used." : {
+      "extractionState" : "stale",
       "localizations" : {
         "ar" : {
           "stringUnit" : {
@@ -177541,6 +177548,16 @@
         }
       }
     },
+    "When this feature is enabled, setting a temporary target below %@ %@ will increase the Autosens Ratio used for ISF and basal adjustments, resulting in more insulin delivered overall. This scales with the temporary target set; the lower the Temp Target, the higher the Autosens Ratio used. It requires Algorithm Settings > Autosens > Autosens Max to be set to > 100%% to work." : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "When this feature is enabled, setting a temporary target below %1$@ %2$@ will increase the Autosens Ratio used for ISF and basal adjustments, resulting in more insulin delivered overall. This scales with the temporary target set; the lower the Temp Target, the higher the Autosens Ratio used. It requires Algorithm Settings > Autosens > Autosens Max to be set to > 100%% to work."
+          }
+        }
+      }
+    },
     "When true, raises BG target when autosens detects sensitivity" : {
       "comment" : "”Sensitivity Raises Target\"",
       "extractionState" : "manual",

Trio/Sources/Modules/Adjustments/AdjustmentsStateModel+Extensions/AdjustmentsStateModel+TempTargets.swift

@@ -400,7 +400,7 @@ extension Adjustments.StateModel {
     /// Determines if sensitivity adjustment is enabled based on target.
     func isAdjustSensEnabled(usingTarget initialTarget: Decimal? = nil) -> Bool {
         let target = initialTarget ?? tempTargetTarget
-        if target < normalTarget, lowTTlowersSens { return true }
+        if target < normalTarget, lowTTlowersSens && maxAutosensSetting > 1 { return true }
         if target > normalTarget, highTTraisesSens || isExerciseModeActive { return true }
         return false
     }
@@ -416,8 +416,9 @@ extension Adjustments.StateModel {
     /// Computes the high value for the slider based on the target.
     func computeSliderHigh(usingTarget initialTarget: Decimal? = nil) -> Double {
         let calcTarget = initialTarget ?? tempTargetTarget
-        guard calcTarget != 0 else { return Double(maxValue * 100) } // oref defined limit for increased insulin delivery
-        let maxSens = calcTarget > normalTarget ? 95 : Double(maxValue * 100)
+        guard calcTarget != 0
+        else { return Double(maxAutosensSetting * 100) } // oref defined limit for increased insulin delivery
+        let maxSens = calcTarget > normalTarget ? 95 : Double(maxAutosensSetting * 100)
         return maxSens
     }
 
@@ -431,10 +432,10 @@ extension Adjustments.StateModel {
         let deviationFromNormal = halfBasalTargetValue - normalTarget
 
         let adjustmentFactor = deviationFromNormal + (calcTarget - normalTarget)
-        let adjustmentRatio: Decimal = (deviationFromNormal * adjustmentFactor <= 0) ? maxValue : deviationFromNormal /
+        let adjustmentRatio: Decimal = (deviationFromNormal * adjustmentFactor <= 0) ? maxAutosensSetting : deviationFromNormal /
             adjustmentFactor
 
-        return Double(min(adjustmentRatio, maxValue) * 100).rounded()
+        return Double(min(adjustmentRatio, maxAutosensSetting) * 100).rounded()
     }
 }
 

Trio/Sources/Modules/Adjustments/AdjustmentsStateModel.swift

@@ -59,7 +59,7 @@ extension Adjustments {
         var tempTargetPresets: [TempTargetStored] = []
         var scheduledTempTargets: [TempTargetStored] = []
         var percentage: Double = 100
-        var maxValue: Decimal = 1.2
+        var maxAutosensSetting: Decimal = 1.2
         var halfBasalTarget: Decimal = 160
         var settingHalfBasalTarget: Decimal = 160
         var highTTraisesSens: Bool = false
@@ -152,7 +152,7 @@ extension Adjustments {
             units = settingsManager.settings.units
             defaultSmbMinutes = settingsManager.preferences.maxSMBBasalMinutes
             defaultUamMinutes = settingsManager.preferences.maxUAMSMBBasalMinutes
-            maxValue = settingsManager.preferences.autosensMax
+            maxAutosensSetting = settingsManager.preferences.autosensMax
             settingHalfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
             halfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
             highTTraisesSens = settingsManager.preferences.highTemptargetRaisesSensitivity
@@ -262,7 +262,7 @@ extension Adjustments.StateModel: SettingsObserver, PreferencesObserver {
     func preferencesDidChange(_: Preferences) {
         defaultSmbMinutes = settingsManager.preferences.maxSMBBasalMinutes
         defaultUamMinutes = settingsManager.preferences.maxUAMSMBBasalMinutes
-        maxValue = settingsManager.preferences.autosensMax
+        maxAutosensSetting = settingsManager.preferences.autosensMax
         settingHalfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
         halfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
         highTTraisesSens = settingsManager.preferences.highTemptargetRaisesSensitivity

Trio/Sources/Modules/Home/HomeStateModel+Setup/TempTargetSetup.swift

@@ -124,9 +124,9 @@ extension Home.StateModel {
         let deviationFromNormal = halfBasalTargetValue - normalTarget
 
         let adjustmentFactor = deviationFromNormal + (tempTargetValue - normalTarget)
-        let adjustmentRatio: Decimal = (deviationFromNormal * adjustmentFactor <= 0) ? maxValue : deviationFromNormal /
+        let adjustmentRatio: Decimal = (deviationFromNormal * adjustmentFactor <= 0) ? maxAutosensSetting : deviationFromNormal /
             adjustmentFactor
 
-        return Int(Double(min(adjustmentRatio, maxValue) * 100).rounded())
+        return Int(Double(min(adjustmentRatio, maxAutosensSetting) * 100).rounded())
     }
 }

Trio/Sources/Modules/Home/HomeStateModel.swift

@@ -63,7 +63,7 @@ extension Home {
         var alarm: GlucoseAlarm?
         var manualTempBasal = false
         var isSmoothingEnabled = false
-        var maxValue: Decimal = 1.2
+        var maxAutosensSetting: Decimal = 1.2
         var lowGlucose: Decimal = 70
         var highGlucose: Decimal = 180
         var currentGlucoseTarget: Decimal = 100
@@ -372,7 +372,7 @@ extension Home {
             manualTempBasal = apsManager.isManualTempBasal
             isSmoothingEnabled = settingsManager.settings.smoothGlucose
             glucoseColorScheme = settingsManager.settings.glucoseColorScheme
-            maxValue = settingsManager.preferences.autosensMax
+            maxAutosensSetting = settingsManager.preferences.autosensMax
             lowGlucose = settingsManager.settings.low
             highGlucose = settingsManager.settings.high
             hbA1cDisplayUnit = settingsManager.settings.hbA1cDisplayUnit
@@ -386,7 +386,6 @@ extension Home {
             highTTraisesSens = settingsManager.preferences.highTemptargetRaisesSensitivity
             lowTTlowersSens = settingsManager.preferences.lowTemptargetLowersSensitivity
             settingHalfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
-            maxValue = settingsManager.preferences.autosensMax
         }
 
         @MainActor private func setupCGMSettings() async {
@@ -690,7 +689,7 @@ extension Home.StateModel:
     }
 
     func preferencesDidChange(_: Preferences) {
-        maxValue = settingsManager.preferences.autosensMax
+        maxAutosensSetting = settingsManager.preferences.autosensMax
         settingHalfBasalTarget = settingsManager.preferences.halfBasalExerciseTarget
         highTTraisesSens = settingsManager.preferences.highTemptargetRaisesSensitivity
         isExerciseModeActive = settingsManager.preferences.exerciseMode

Trio/Sources/Modules/TargetBehavoir/View/TargetBehavoirRootView.swift

@@ -11,6 +11,7 @@ extension TargetBehavoir {
         @State var hintLabel: String?
         @State private var decimalPlaceholder: Decimal = 0.0
         @State private var booleanPlaceholder: Bool = false
+        @State private var showAutosensMaxAlert = false
 
         @Environment(\.colorScheme) var colorScheme
         @EnvironmentObject var appIcons: Icons
@@ -59,7 +60,7 @@ extension TargetBehavoir {
 
                 SettingInputSection(
                     decimalValue: $decimalPlaceholder,
-                    booleanValue: $state.lowTemptargetLowersSensitivity,
+                    booleanValue: lowTTLowersSensBinding,
                     shouldDisplayHint: $shouldDisplayHint,
                     selectedVerboseHint: Binding(
                         get: { selectedVerboseHint },
@@ -86,7 +87,7 @@ extension TargetBehavoir {
                     VStack(alignment: .leading, spacing: 10) {
                         Text("Default: OFF").bold()
                         Text(
-                            "When this feature is enabled, setting a temporary target below \(state.units == .mgdL ? "100" : 100.formattedAsMmolL) \(state.units.rawValue) will increase the Autosens Ratio used for ISF and basal adjustments, resulting in more insulin delivered overall. This scales with the temporary target set; the lower the Temp Target, the higher the Autosens Ratio used."
+                            "When this feature is enabled, setting a temporary target below \(state.units == .mgdL ? "100" : 100.formattedAsMmolL) \(state.units.rawValue) will increase the Autosens Ratio used for ISF and basal adjustments, resulting in more insulin delivered overall. This scales with the temporary target set; the lower the Temp Target, the higher the Autosens Ratio used. It requires Algorithm Settings > Autosens > Autosens Max to be set to > 100% to work."
                         )
                         Text(
                             "If Half Basal Exercise Target is \(state.units == .mgdL ? "160" : 160.formattedAsMmolL) \(state.units.rawValue), a Temp Target of \(state.units == .mgdL ? "95" : 95.formattedAsMmolL) \(state.units.rawValue) uses an Autosens Ratio of 1.09. A Temp Target of \(state.units == .mgdL ? "85" : 85.formattedAsMmolL) \(state.units.rawValue) uses an Autosens Ratio of 1.33."
@@ -186,11 +187,45 @@ extension TargetBehavoir {
             }
             .scrollContentBackground(.hidden).background(appState.trioBackgroundColor(for: colorScheme))
             .onAppear(perform: configureView)
+            .alert(
+                "Cannot Enable This Setting",
+                isPresented: $showAutosensMaxAlert
+            ) {
+                // Alert button(s). For a single button:
+                Button("Got it!", role: .cancel) {}
+            } message: {
+                Text("This feature cannot be enabled unless Autosens Max > 100%.")
+            }
             .navigationTitle("Target Behavior")
             .navigationBarTitleDisplayMode(.automatic)
 //            .onDisappear {
 //                state.saveIfChanged()
 //            }
         }
+
+        private var lowTTLowersSensBinding: Binding<Bool> {
+            Binding<Bool>(
+                get: {
+                    state.lowTemptargetLowersSensitivity
+                },
+                set: { newValue in
+                    if newValue {
+                        // Check some condition, e.g. from `settingsManager` or any property
+                        // For example: if state.settings.preferences.autosensMax > 1
+                        // You may need to adapt this to your actual condition:
+                        if state.settings.preferences.autosensMax > 1 {
+                            state.lowTemptargetLowersSensitivity = true
+                        } else {
+                            // Disallow enabling and optionally show an alert
+                            showAutosensMaxAlert = true
+                            state.lowTemptargetLowersSensitivity = false
+                        }
+                    } else {
+                        // Always allow turning it off
+                        state.lowTemptargetLowersSensitivity = false
+                    }
+                }
+            )
+        }
     }
 }