ksys: Add act::getRandomAreaItem

2 files changed, 36 insertions, 0 deletions

diff --git a/src/KingSystem/ActorSystem/actActorUtil.cpp b/src/KingSystem/ActorSystem/actActorUtil.cpp
index 95062d8e..798506b8 100644
--- a/src/KingSystem/ActorSystem/actActorUtil.cpp
+++ b/src/KingSystem/ActorSystem/actActorUtil.cpp
@@ -1,6 +1,7 @@
 #include "KingSystem/ActorSystem/actActorUtil.h"
 #include <container/seadSafeArray.h>
 #include <math/seadMathCalcCommon.h>
+#include <random/seadGlobalRandom.h>
 #include "KingSystem/ActorSystem/Profiles/actRopeBase.h"
 #include "KingSystem/ActorSystem/actActor.h"
 #include "KingSystem/ActorSystem/actActorConstDataAccess.h"
@@ -586,6 +587,35 @@ bool getSameGroupActorName(sead::SafeString* name, const sead::SafeString& actor
     return true;
 }
 
+bool getRandomAreaItem(sead::SafeString* item, const eco::AreaItemType& type,
+                       const sead::Vector3f& pos) {
+    auto* eco = eco::Ecosystem::instance();
+    if (!eco)
+        return false;
+
+    const int area = eco->getFieldMapArea(pos.x, pos.z);
+    eco::AreaItemSet items;
+    eco->getAreaItems(area, type, &items);
+
+    int chosen_idx = -1;
+    int running_total = 0;
+
+    for (int idx = 0; idx < items.count; ++idx) {
+        const int num = items.items[idx].num;
+        running_total += num;
+        if (int(sead::GlobalRandom::instance()->getU32(running_total)) < num)
+            chosen_idx = idx;
+    }
+
+    if (chosen_idx < 0) {
+        *item = sead::SafeString::cEmptyString;
+        return false;
+    }
+
+    *item = items.items[chosen_idx].name;
+    return true;
+}
+
 bool isInSatoriMountainArea(const sead::Vector3f& pos) {
     return eco::Ecosystem::instance()->getFieldMapArea(pos.x, pos.z) == 64;
 }
diff --git a/src/KingSystem/ActorSystem/actActorUtil.h b/src/KingSystem/ActorSystem/actActorUtil.h
index e940f301..2e0a576e 100644
--- a/src/KingSystem/ActorSystem/actActorUtil.h
+++ b/src/KingSystem/ActorSystem/actActorUtil.h
@@ -7,6 +7,10 @@ namespace al {
 class ByamlIter;
 }
 
+namespace ksys::eco {
+enum class AreaItemType;
+}
+
 namespace ksys::map {
 class Object;
 }
@@ -167,6 +171,8 @@ bool getSameGroupActorName(sead::SafeString* name, const sead::SafeString& actor
 
 s32 getSelectedChoiceIdx(s32 max, const char* query_name);
 
+bool getRandomAreaItem(sead::SafeString* item, const eco::AreaItemType& type,
+                       const sead::Vector3f& pos);
 bool isInSatoriMountainArea(const sead::Vector3f& pos);
 
 }  // namespace ksys::act