Added Maidenhead locator conversion functions and tests #2

app/src/main/java/com/rtbishop/look4sat/utility/Utilities.kt

@@ -2,6 +2,7 @@ package com.rtbishop.look4sat.utility
 
 import android.content.SharedPreferences
 import android.view.View
+import com.github.amsacode.predict4java.GroundStationPosition
 import com.google.android.material.snackbar.Snackbar
 import java.util.concurrent.TimeUnit
 import kotlin.math.round
@@ -33,4 +34,36 @@ object Utilities {
     fun SharedPreferences.getDouble(key: String, default: Double): Double {
         return Double.fromBits(getLong(key, default.toRawBits()))
     }
+
+    fun qthToGSP(qthString: String): GroundStationPosition {
+        val latFirst = (qthString[1].toInt() - 65) * 10
+        val latSecond = qthString[3].toString().toInt()
+        val latThird = (((qthString[5].toInt() - 97) / 24.0) + (1.0 / 48.0)) - 90
+        val latitude = latFirst + latSecond + latThird
+
+        val lonFirst = (qthString[0].toInt() - 65) * 20
+        val lonSecond = qthString[2].toString().toInt() * 2
+        val lonThird = (((qthString[4].toInt() - 97) / 12.0) + (1.0 / 24.0)) - 180
+        val longitude = lonFirst + lonSecond + lonThird
+
+        return GroundStationPosition(latitude, longitude, 0.0)
+    }
+
+    fun locToQTH(lat: Double, lon: Double): String {
+        val tempLon = if (lon > 180.0) lon - 360 else lon
+        val upper = "ABCDEFGHIJKLMNOPQRSTUVWX"
+        val lower = "abcdefghijklmnopqrstuvwx"
+
+        val latitude = lat + 90
+        val latFirst = upper[(latitude / 10).toInt()]
+        val latSecond = (latitude % 10).toInt().toString()
+        val latThird = lower[((latitude % 1) * 24).toInt()]
+
+        val longitude = tempLon + 180
+        val lonFirst = upper[(longitude / 20).toInt()]
+        val lonSecond = ((longitude / 2) % 10).toInt().toString()
+        val lonThird = lower[((longitude % 2) * 12).toInt()]
+
+        return "$lonFirst$latFirst$lonSecond$latSecond$lonThird$latThird"
+    }
 }