Fix: Show 'unknown' for position logs older than 6 months (#1416)

* Fix: Show 'unknown' for position logs older than 6 months

Display 'unknown' instead of the timestamp for position logs older than 6 months. This addresses an issue where unknown timestamps were incorrectly shown as 1970 (unix epoch).

* Fix: make detekt happy

* Replace "Unknown" with "Unknown Age" in position logs

The text displayed for positions older than six months in position logs has been changed from "Unknown" to "Unknown Age". This update adds clarity and context to the age of positions in the log.

app/src/main/java/com/geeksville/mesh/ui/components/PositionLog.kt

@@ -17,8 +17,8 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
 import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.ContentAlpha
 import androidx.compose.material.Icon
@@ -55,6 +55,7 @@ import com.geeksville.mesh.ui.theme.AppTheme
 import com.geeksville.mesh.util.metersIn
 import com.geeksville.mesh.util.toString
 import java.text.DateFormat
+import kotlin.time.Duration.Companion.days
 
 @Composable
 private fun RowScope.PositionText(text: String, weight: Float) {
@@ -117,10 +118,26 @@ private fun PositionItem(
             PositionText("${position.groundSpeed} Km/h", Weight15)
             PositionText("%.0f°".format(position.groundTrack * HeadingDeg), Weight15)
         }
-        PositionText(dateFormat.format(position.time * SecondsToMillis), Weight40)
+        PositionText(formatPositionTime(position, dateFormat), Weight40)
     }
 }
 
+@Composable
+private fun formatPositionTime(
+    position: MeshProtos.Position,
+    dateFormat: DateFormat
+): String {
+    val currentTime = System.currentTimeMillis()
+    val sixMonthsAgo = currentTime - 180.days.inWholeMilliseconds
+    val isOlderThanSixMonths = position.time * SecondsToMillis > sixMonthsAgo
+    val timeText = if (isOlderThanSixMonths) {
+        stringResource(id = R.string.unknown_age)
+    } else {
+        dateFormat.format(position.time * SecondsToMillis)
+    }
+    return timeText
+}
+
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
 private fun ActionButtons(

app/src/main/res/values/strings.xml

@@ -312,4 +312,5 @@
     <string name="max">Max</string>
     <string name="selected">Selected</string>
     <string name="not_selected">Not Selected</string>
+    <string name="unknown_age">Unknown Age</string>
 </resources>