postal system wip

src/net/torvald/terrarum/modulebasegame/gameworld/GamePostalService.kt

@@ -0,0 +1,66 @@
+package net.torvald.terrarum.modulebasegame.gameworld
+
+import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
+import kotlin.math.ceil
+
+/**
+ * Note: this implementation of the postal service won't reach outside a world; the attempt to interworld-delivery
+ * must be made when the other world is being loaded (perhaps using the world loading hook)
+ *
+ * Created by minjaesong on 2024-12-29.
+ */
+class GamePostalService {
+
+
+    companion object {
+        private val reXmlTag = Regex("""<[^>]+>""")
+        private val reIndents = Regex("""^ +""")
+        private val reComments = Regex("""<!--|-->""")
+
+        private fun removeTags(xml: String): String {
+            return xml.replace(reXmlTag, "").replace(reIndents, "").replace(reComments, "")
+        }
+
+        fun calculateBasePostage(post: Post): Int {
+            val baseUnits = when (post.postContents.type) {
+                "text" -> {
+                    post.postContents.contentsRaw.length / 1200.0
+                }
+                "btex" -> {
+                    removeTags(post.postContents.contentsRaw).length / 1200.0
+                }
+                else -> {
+                    TODO()
+                }
+            }
+
+            val paperUnit = ceil(baseUnits)
+            val parcelWeight = ceil(post.parcel?.totalWeight ?: 0.0) // 1 credit per 1 kg
+
+            val extraCharge = when (post.postType) {
+                0 -> 1.0
+                128 -> 0.0
+                else -> 1.0
+            }
+
+            return ceil((paperUnit + parcelWeight) * extraCharge).toInt()
+        }
+    }
+}
+
+data class Post(
+    val sender: String, // an identifier for an actor, an entity, etc.; actor identifier is always "UUID:<actor UUID>"
+    val receiver: String, // an identifier for an actor, an entity, etc.; actor identifier is always "UUID:<actor UUID>"
+    val postmarkDate: Long, // world TIME_T
+    val postType: Int = 0, // 0: regular post; 128: sent by system/NPCs; may be extended with future additions such as registered post
+    val postContents: PostContents,
+    val parcel: FixtureInventory?,
+) {
+    @Transient val basePostage = GamePostalService.calculateBasePostage(this)
+}
+
+data class PostContents(
+    val type: String, // "text", "btex"
+    val contentsRaw: String, // plain text for "text"; xml for "btex"
+    val contentsExtra: Any? = null
+)