refactor: create GainLifeAllEffect

Mage/src/main/java/mage/abilities/effects/common/GainLifeAllEffect.java

@@ -0,0 +1,83 @@
+package mage.abilities.effects.common;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
+import mage.constants.TargetController;
+import mage.game.Game;
+
+import java.util.Collection;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public class GainLifeAllEffect extends OneShotEffect {
+
+    private final int amount;
+    private final TargetController targetController;
+
+    public GainLifeAllEffect(int amount) {
+        this(amount, TargetController.EACH_PLAYER);
+    }
+
+    public GainLifeAllEffect(int amount, TargetController targetController) {
+        super(Outcome.Benefit);
+        this.amount = amount;
+        this.targetController = targetController;
+        staticText = makeRule(amount, targetController);
+    }
+
+    private GainLifeAllEffect(final GainLifeAllEffect effect) {
+        super(effect);
+        this.amount = effect.amount;
+        this.targetController = effect.targetController;
+    }
+
+    @Override
+    public GainLifeAllEffect copy() {
+        return new GainLifeAllEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        for (UUID playerId : getPlayers(targetController, game, source)) {
+            Optional.ofNullable(playerId)
+                    .map(game::getPlayer)
+                    .ifPresent(player -> player.gainLife(amount, game, source));
+        }
+        return true;
+    }
+
+    private static Collection<UUID> getPlayers(TargetController targetController, Game game, Ability source) {
+        switch (targetController) {
+            case ANY:
+            case EACH_PLAYER:
+                return game.getState().getPlayersInRange(source.getControllerId(), game);
+            case OPPONENT:
+                return game.getOpponents(source.getControllerId());
+            default:
+                throw new IllegalArgumentException("TargetController " + targetController + " not supported");
+        }
+    }
+
+    private static String makeRule(int amount, TargetController targetController) {
+        StringBuilder sb = new StringBuilder("each ");
+        switch (targetController) {
+            case ANY:
+            case EACH_PLAYER:
+                sb.append("player");
+                break;
+            case OPPONENT:
+                sb.append("opponent");
+                break;
+            default:
+                throw new IllegalArgumentException("TargetController " + targetController + " not supported");
+        }
+        sb.append(" gains ");
+        sb.append(amount);
+        sb.append(" life");
+        return sb.toString();
+    }
+}