hydration: spoken 'hydrate now' alert, per-activity sweat, drink reconciliation

- signal is now a loud TTS 'hydrate now' on the ALARM stream (TTS warmed at
  session start), so it is unmistakably BalDav and audible when the phone is not
  in view (walking/VR); the old ringtone was indistinguishable from a system alarm.
- sweat need scales by activity instead of a flat 600 ml/h: bike 600, walk 200,
  run 450, workout/vr 250 ml/h. Walking no longer nags every 15 min.
- deficit split into baseDeficit (seeded from the food log) + accrued sweat;
  logging a drink mid-session recomputes the base and re-seeds via seedSeq, so it
  silences the reminder. seedSeq=0 (profile save / init) never zeroes it mid-ride.
- persistent 'БалДав: попей воды (HH:MM)' notification left as a record.

src-tauri/gen/android/app/src/main/java/dev/baldav/app/Hydration.kt

@@ -12,8 +12,10 @@ import android.os.Build
 import android.os.Handler
 import android.os.VibrationEffect
 import android.os.Vibrator
+import android.speech.tts.TextToSpeech
 import android.util.Log
 import java.io.File
+import java.util.Locale
 import org.json.JSONObject
 
 // Drink reminder shared by GpsRecorderService (rides) and BleHrService (VR/workout). LEVEL-based,
@@ -25,18 +27,23 @@ import org.json.JSONObject
 object Hydration {
     private const val TAG = "Hydration"
     private const val CH = "baldav_hydration"
-    private var accruedMl = 0.0          // running water deficit: start-of-session shortfall + sweat
-    private var startDeficitMl = 0.0     // how far behind you were at session start (from the food log)
-    private var pendingStart = false     // apply startDeficitMl on the first tick after reset()
+    private var baseDeficit = 0.0        // sedentary shortfall at (re)seed: need-so-far minus intake
+    private var sweatMl = 0.0            // activity sweat accrued this session (grows with the session)
+    private var startDeficitMl = 0.0     // last seeded base from the food log; applied on (re)seed
+    private var seedSeq = 0L             // JS bumps it on (re)seed (e.g. after you log a drink)
+    private var lastSeedSeq = -1L        // a change re-applies startDeficitMl to baseDeficit mid-session
+    private var pendingStart = false     // apply the seed on the first tick after reset()
     private var lastTickMs = 0L
     private var lastBeepMs = 0L
     private var lastCfgMs = 0L
     private var enabled = true           // ON by default — works out of the box, no toggle to find
-    private var sweatMlPerMin = 10.0     // need rate during an active session (600 ml/h default)
+    private var sweatMlPerMin = 10.0     // need rate during an active session (set per activity by JS)
     private var alertMl = 600.0          // beep once the deficit reaches this
     private var reAlertMs = 15 * 60 * 1000L
     private var lastLogMs = 0L
     private var savedAlarmVol = -1       // alarm volume to restore after an alert
+    private var tts: TextToSpeech? = null
+    private var ttsReady = false         // the signal is a SPOKEN "hydrate now" — unmistakably BalDav
 
     private fun readCfg(ctx: Context) {
         try {
@@ -48,6 +55,11 @@ object Hydration {
                 alertMl = j.optInt("alertMl", 600).coerceIn(100, 3000).toDouble()
                 reAlertMs = j.optInt("reAlertMin", 15).coerceIn(2, 120) * 60_000L
                 startDeficitMl = j.optInt("startDeficitMl", 0).coerceIn(0, 5000).toDouble()
+                seedSeq = j.optLong("seedSeq", 0L)
+                // a NON-ZERO new seedSeq means JS recomputed the base (session start / after a drink)
+                // -> re-apply it to baseDeficit mid-session; sweat keeps accruing. seedSeq=0 (profile
+                // save, init) must NOT zero the deficit mid-ride, so it's ignored here.
+                if (seedSeq != 0L && seedSeq != lastSeedSeq) { baseDeficit = startDeficitMl; lastSeedSeq = seedSeq }
             } else enabled = true // no config yet -> ON by default
         } catch (e: Exception) { Log.e(TAG, "cfg: ${e.message}"); enabled = true }
     }
@@ -63,14 +75,15 @@ object Hydration {
         val now = System.currentTimeMillis()
         if (now - lastCfgMs > 30_000L) { readCfg(ctx); lastCfgMs = now }
         if (!enabled) { if (now - lastLogMs > 120_000L) { logState(ctx, "disabled"); lastLogMs = now }; return }
-        if (pendingStart) { accruedMl = startDeficitMl; pendingStart = false }
-        if (lastTickMs == 0L) { lastTickMs = now; logState(ctx, "start"); lastLogMs = now; return }
+        if (pendingStart) { baseDeficit = startDeficitMl; sweatMl = 0.0; lastSeedSeq = seedSeq; pendingStart = false }
+        if (lastTickMs == 0L) { lastTickMs = now; ensureTts(ctx); logState(ctx, "start"); lastLogMs = now; return }
         val dtMin = (now - lastTickMs) / 60_000.0
         lastTickMs = now
-        accruedMl += sweatMlPerMin * dtMin
-        if (accruedMl >= alertMl && now - lastBeepMs >= reAlertMs) {
+        sweatMl += sweatMlPerMin * dtMin
+        val deficit = baseDeficit + sweatMl
+        if (deficit >= alertMl && now - lastBeepMs >= reAlertMs) {
             lastBeepMs = now
-            val ok = beep(ctx, handler); vibrate(ctx); notify(ctx, accruedMl.toInt())
+            val ok = beep(ctx, handler); vibrate(ctx); notify(ctx, deficit.toInt())
             logState(ctx, if (ok) "beepOk" else "beepError"); lastLogMs = now
         } else if (now - lastLogMs > 120_000L) { logState(ctx, "tick"); lastLogMs = now }
     }
@@ -80,8 +93,8 @@ object Hydration {
         try {
             val f = File(ctx.filesDir.parentFile ?: ctx.filesDir, "hydration_log.jsonl")
             f.appendText("{\"ts\":${System.currentTimeMillis() / 1000},\"ev\":\"$event\"," +
-                "\"enabled\":$enabled,\"accruedMl\":${accruedMl.toInt()},\"alertMl\":${alertMl.toInt()}," +
-                "\"startMl\":${startDeficitMl.toInt()}}\n")
+                "\"enabled\":$enabled,\"accruedMl\":${(baseDeficit + sweatMl).toInt()},\"sweatMl\":${sweatMl.toInt()}," +
+                "\"baseMl\":${baseDeficit.toInt()},\"alertMl\":${alertMl.toInt()},\"startMl\":${startDeficitMl.toInt()}}\n")
         } catch (e: Exception) {}
     }
 
@@ -93,24 +106,43 @@ object Hydration {
             val am = ctx.getSystemService(Context.AUDIO_SERVICE) as AudioManager
             if (savedAlarmVol < 0) savedAlarmVol = am.getStreamVolume(AudioManager.STREAM_ALARM)
             am.setStreamVolume(AudioManager.STREAM_ALARM, am.getStreamMaxVolume(AudioManager.STREAM_ALARM), 0)
-            val uri = RingtoneManager.getActualDefaultRingtoneUri(ctx, RingtoneManager.TYPE_ALARM)
-                ?: RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM)
-            val mp = MediaPlayer()
-            mp.setAudioAttributes(AudioAttributes.Builder()
-                .setUsage(AudioAttributes.USAGE_ALARM)
-                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION).build())
-            mp.setDataSource(ctx, uri)
-            mp.isLooping = true
-            mp.prepare()
-            mp.start()
+            if (tts == null) {
+                tts = TextToSpeech(ctx.applicationContext) { status ->
+                    ttsReady = status == TextToSpeech.SUCCESS
+                    if (ttsReady) { try { tts?.language = Locale.US } catch (e: Exception) {}; speakNow() }
+                }
+            } else if (ttsReady) speakNow()
+            // restore the alarm volume a few seconds after the phrase
             handler.postDelayed({
-                try { mp.stop(); mp.release() } catch (e: Exception) {}
                 try { if (savedAlarmVol >= 0) { am.setStreamVolume(AudioManager.STREAM_ALARM, savedAlarmVol, 0); savedAlarmVol = -1 } } catch (e: Exception) {}
-            }, 4000)
+            }, 5000)
             true
         } catch (e: Exception) { Log.e(TAG, "beep: ${e.message}"); false }
     }
 
+    // Warm the TTS engine up at session start so the first alert isn't silent (init is async).
+    private fun ensureTts(ctx: Context) {
+        if (tts != null) return
+        try {
+            tts = TextToSpeech(ctx.applicationContext) { status ->
+                ttsReady = status == TextToSpeech.SUCCESS
+                if (ttsReady) { try { tts?.language = Locale.US } catch (e: Exception) {} }
+            }
+        } catch (e: Exception) { Log.e(TAG, "tts init: ${e.message}") }
+    }
+
+    // Speak the phrase over the ALARM stream so it's loud even with media muted.
+    private fun speakNow() {
+        try {
+            val t = tts ?: return
+            t.setAudioAttributes(AudioAttributes.Builder()
+                .setUsage(AudioAttributes.USAGE_ALARM)
+                .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH).build())
+            t.speak("hydrate now", TextToSpeech.QUEUE_FLUSH, null, "hyd1")
+            t.speak("hydrate now", TextToSpeech.QUEUE_ADD, null, "hyd2")
+        } catch (e: Exception) { Log.e(TAG, "speak: ${e.message}") }
+    }
+
     private fun vibrate(ctx: Context) {
         try {
             val v = ctx.getSystemService(Context.VIBRATOR_SERVICE) as? Vibrator ?: return
@@ -127,11 +159,12 @@ object Hydration {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && nm.getNotificationChannel(CH) == null) {
                 nm.createNotificationChannel(NotificationChannel(CH, "Напоминание пить", NotificationManager.IMPORTANCE_HIGH))
             }
+            val time = java.text.SimpleDateFormat("HH:mm", Locale.getDefault()).format(java.util.Date())
             val n = Notification.Builder(ctx, CH)
-                .setContentTitle("Попей воды!")
-                .setContentText("Отстаёшь примерно на $deficitMl мл — попей")
+                .setContentTitle("БалДав: попей воды")
+                .setContentText("$time — отстаёшь примерно на $deficitMl мл")
                 .setSmallIcon(android.R.drawable.ic_menu_compass)
-                .setAutoCancel(true)
+                .setAutoCancel(true) // stays in the shade as a record until you tap it
                 .build()
             nm.notify(776601, n)
         } catch (e: Exception) { Log.e(TAG, "notify: ${e.message}") }

src-tauri/src/lib.rs

@@ -550,10 +550,12 @@ fn gps_service_command(app: tauri::AppHandle, cmd: String) -> Result<String, Str
 // start_deficit_ml: how far behind on water you were at session start (from logged intake vs
 // need-so-far), computed in JS and seeded into the native deficit. From the settings screen it is 0.
 #[tauri::command]
-fn set_hydration_config(app: tauri::AppHandle, enabled: bool, alert_ml: u32, sweat_ml_per_hour: u32, re_alert_min: u32, start_deficit_ml: u32) -> Result<String, String> {
+fn set_hydration_config(app: tauri::AppHandle, enabled: bool, alert_ml: u32, sweat_ml_per_hour: u32, re_alert_min: u32, start_deficit_ml: u32, seed_seq: Option<u64>) -> Result<String, String> {
+    // seed_seq: bump it (e.g. a timestamp) whenever the base deficit is recomputed mid-session
+    // (after logging a drink) so the native side re-applies start_deficit_ml to its baseDeficit.
     let json = format!(
-        "{{\"enabled\":{},\"alertMl\":{},\"sweatMlPerHour\":{},\"reAlertMin\":{},\"startDeficitMl\":{}}}",
-        enabled, alert_ml.clamp(100, 3000), sweat_ml_per_hour.clamp(60, 2000), re_alert_min.clamp(2, 120), start_deficit_ml.clamp(0, 5000)
+        "{{\"enabled\":{},\"alertMl\":{},\"sweatMlPerHour\":{},\"reAlertMin\":{},\"startDeficitMl\":{},\"seedSeq\":{}}}",
+        enabled, alert_ml.clamp(100, 3000), sweat_ml_per_hour.clamp(60, 2000), re_alert_min.clamp(2, 120), start_deficit_ml.clamp(0, 5000), seed_seq.unwrap_or(0)
     );
     write_app_root_file(&app, "hydration.json", &json);
     Ok(json)