9: Support percentage expressions in alarm targets

conf/alarms.conf.example

@@ -1,4 +1,8 @@
-# ID   Asset   Direction   Target    TRIGGER   SEVERITY   NOTE
+# Id   Asset   Direction        Target   Trigger   Severity   Note
-################################################################################################################
+######################################################################################################################
-1      SOL     BELOW       170.0     ONETIME   INFO       "EMERGENCY: Risiko for Perps Solana long LIKVIDERING!"
+1      SOL     ABOVE       97.03-1.25%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Solana short LIKVIDERING!"
-2      SOL     BELOW       71.4      ONETIME   CRITICAL   "CRITICAL: Risiko for Solana Raydium LÅN LIKVIDERING!"
+2      SOL     BELOW       48.72+1.25%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Solana long LIKVIDERING!"
+3      BTC     ABOVE       85032.87-1%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Bitcoin short LIKVIDERING!"
+4      BTC     BELOW       42779.40+1%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Bitcoin long LIKVIDERING!"
+5      ETH     ABOVE        2296.13-1%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Ethereum short LIKVIDERING!"
+6      ETH     BELOW        1155.19+1%   ONETIME   CRITICAL   "CRITICAL: Risiko for Perps Ethereum long LIKVIDERING!"

src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/AlarmConfigurationParser.tjava

@@ -53,7 +53,7 @@ public final class AlarmConfigurationParser {
                 cursor.nextToken("direction").toUpperCase(Locale.ROOT)
         );
 
-        BigDecimal target = new BigDecimal(cursor.nextToken("target"));
+        BigDecimal target = parseTarget(cursor.nextToken("target"));
 
         AlarmTrigger trigger = AlarmTrigger.valueOf(
                 cursor.nextToken("trigger").toUpperCase(Locale.ROOT)
@@ -83,6 +83,57 @@ public final class AlarmConfigurationParser {
         );
     }
 
+    private static BigDecimal parseTargetPercentage(
+            String targetStr,
+            int operatorIndex,
+            boolean add
+    ) {
+        BigDecimal base = new BigDecimal(targetStr.substring(0, operatorIndex));
+        String percentStr = targetStr.substring(operatorIndex + 1, targetStr.length() - 1);
+        BigDecimal percent = new BigDecimal(percentStr);
+
+        BigDecimal delta = base
+                .multiply(percent)
+                .divide(BigDecimal.valueOf(100));
+
+        BigDecimal target = add ? base.add(delta) : base.subtract(delta);
+
+        validateTarget(base, targetStr);
+        validateTarget(percent, targetStr);
+        validateTarget(target, targetStr);
+
+        return target;
+    }
+
+    private static void validateTarget(BigDecimal target, String originalTargetStr) {
+        if (target.compareTo(BigDecimal.ZERO) < 0) {
+            throw new IllegalArgumentException(
+                    "Target must be zero or positive: " + originalTargetStr
+            );
+        }
+    }
+
+    private static BigDecimal parseTarget(String targetStr) {
+        String trimmedTargetStr = targetStr.trim();
+
+        if (trimmedTargetStr.endsWith("%")) {
+            int plusIndex = trimmedTargetStr.indexOf('+');
+            int minusIndex = trimmedTargetStr.indexOf('-', 1);
+
+            if (plusIndex >= 0) {
+                return parseTargetPercentage(trimmedTargetStr, plusIndex, true);
+            }
+
+            if (minusIndex >= 0) {
+                return parseTargetPercentage(trimmedTargetStr, minusIndex, false);
+            }
+        }
+
+        BigDecimal target = new BigDecimal(trimmedTargetStr);
+        validateTarget(target, targetStr);
+        return target;
+    }
+
     private static final class Cursor {
         private Cursor(String line) {
             this.line = line;