Rewrite Mo NPC script to be GMS-like

scripts/npc/9201099.js

@@ -1,14 +1,88 @@
 /**
- *9201098 - Mo
- *@author Ronan
+ * 9201098 - Mo
+ * @author Ronan
+ * @author Ponk
  */
 
+let status = 0;
+let selectedItem = undefined;
+
+/*
+References:
+- https://www.youtube.com/watch?v=g6y2zmCGglI
+- https://www.youtube.com/watch?v=CttmlVWLJKM
+*/
 function start() {
-    if (cm.getQuestStatus(8224) == 2) {
-        cm.openShopNPC(9201099);
-    } else {
-        cm.sendOk("Hm, at who do you think you are looking at?");
+    if (cm.getQuestStatus(8224) !== 2) {
+        cm.sendDefault();
+        cm.dispose();
+        return;
     }
 
-    cm.dispose();
+    cm.sendSimple("Name's Mo. I've got Mo' items for Mo' mesos. What business do you bring me?\r\n#L0##bI'd like to buy some items#k");
+}
+
+function action(action, type, selection) {
+    if (!action) {
+        cm.dispose();
+        return;
+    }
+
+    if (status === 0) {
+        let index = 0;
+        const selections = "#e" + shopItems()
+            .map(i => {
+                const mesoText = i.quantity === 1 ? "meso" : `meso per ${i.quantity} arrows`;
+                return `\r\n#L${index++}##i${i.itemId}# #z${i.itemId}# #b${i.cost} ${mesoText}#k`;
+            })
+            .join("");
+        cm.sendSimple("An ally of the Raven Ninja Clan is welcome to buy from me!" + selections);
+        status++;
+    } else if (status === 1 && selection !== -1) {
+        selectedItem = shopItems()[selection];
+        cm.sendAcceptDecline("Are you sure you want to buy it?");
+        status++;
+    } else if (status === 2) {
+        if (!selectedItem) {
+            cm.dispose();
+            return;
+        }
+        if (!cm.hasMeso(selectedItem.cost)) {
+            cm.sendOk("You don't have enough mesos.");
+            cm.dispose();
+            return;
+        }
+        if (!cm.canHold(selectedItem.itemId, selectedItem.quantity)) {
+            cm.sendOk("There's no room in your inventory.");
+            cm.dispose();
+            return;
+        }
+
+        cm.loseMeso(selectedItem.cost);
+        cm.gainItem(selectedItem.itemId, selectedItem.quantity);
+        cm.dispose();
+    }
+}
+
+function shopItems() {
+    return [
+        {itemId: 2050004, quantity: 1, cost: 400}, // All-Cure Potion
+        {itemId: 2050000, quantity: 1, cost: 200}, // Antidote
+        {itemId: 2020012, quantity: 1, cost: 4500}, // Melting Cheese
+        {itemId: 2020013, quantity: 1, cost: 5000}, // Reindeer Milk
+        {itemId: 2020014, quantity: 1, cost: 8100}, // Sunrise Dew
+        {itemId: 2020015, quantity: 1, cost: 9690}, // Sunset Dew
+        {itemId: 2050001, quantity: 1, cost: 200}, // Eyedrop
+        {itemId: 2050002, quantity: 1, cost: 300}, // Tonic
+        {itemId: 2050003, quantity: 1, cost: 500}, // Holy Water
+        {itemId: 2022000, quantity: 1, cost: 1650}, // Pure Water
+        {itemId: 2002017, quantity: 1, cost: 5000}, // Warrior Elixir
+        {itemId: 2060004, quantity: 2000, cost: 40_000}, // Diamond Arrow for Bow
+        {itemId: 2061004, quantity: 2000, cost: 40_000}, // Diamond Arrow for Crossbow
+        {itemId: 2070010, quantity: 1, cost: 2000}, // Icicle
+        {itemId: 2022003, quantity: 1, cost: 1100}, // Unagi
+        {itemId: 2000006, quantity: 1, cost: 620}, // Mana Elixir
+        {itemId: 2022002, quantity: 1, cost: 1000}, // Cider
+        {itemId: 2030020, quantity: 1, cost: 400}, // Return to New Leaf City Scroll
+    ]
 }

src/main/java/scripting/AbstractPlayerInteraction.java

@@ -36,6 +36,8 @@ import net.server.Server;
 import net.server.guild.Guild;
 import net.server.world.Party;
 import net.server.world.PartyCharacter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import scripting.event.EventInstanceManager;
 import scripting.event.EventManager;
 import scripting.npc.NPCScriptManager;
@@ -61,6 +63,7 @@ import java.util.*;
 import static java.util.concurrent.TimeUnit.DAYS;
 
 public class AbstractPlayerInteraction {
+    private static final Logger log = LoggerFactory.getLogger(AbstractPlayerInteraction.class);
 
     public Client c;
 
@@ -68,6 +71,10 @@ public class AbstractPlayerInteraction {
         this.c = c;
     }
 
+    public void log(String message) {
+        log.info(message);
+    }
+
     public Client getClient() {
         return c;
     }
@@ -1207,4 +1214,4 @@ public class AbstractPlayerInteraction {
     private void sendBlueNotice(MapleMap map, String message) {
         map.dropMessage(6, message);
     }
-}
+}

src/main/java/scripting/npc/NPCConversationManager.java

@@ -272,10 +272,23 @@ public class NPCConversationManager extends AbstractPlayerInteraction {
         return getPlayer().getMeso();
     }
 
+    // TODO: refactor scripts to use this instead of "getMeso() < amount"
+    public boolean hasMeso(int amount) {
+        return getMeso() >= amount;
+    }
+
     public void gainMeso(int gain) {
         getPlayer().gainMeso(gain);
     }
 
+    // TODO: refactor scripts to use this instead of "gainMeso(-amount)"
+    public void loseMeso(int loss) {
+        if (loss < 0) {
+            throw new IllegalArgumentException("Can only lose positive amount of mesos");
+        }
+        gainMeso(-loss);
+    }
+
     public void gainExp(int gain) {
         getPlayer().gainExp(gain, true, true);
     }