feat: Implement safety checks for elevator teleportation to prevent players from getting stuck in blocks.

src/main/kotlin/com/github/kaaariyaaa/elevator/listeners/EventListener.kt

@@ -7,6 +7,8 @@ import com.destroystokyo.paper.event.player.PlayerJumpEvent
 import org.bukkit.entity.Player
 import org.bukkit.Material
 import org.bukkit.block.Block
+import org.bukkit.Location
+import org.bukkit.util.BoundingBox
 
 import com.github.kaaariyaaa.elevator.App
 
@@ -23,20 +25,26 @@ class EventListener(private val plugin: App) : Listener {
         val blockUnder = player.location.subtract(0.0, 1.0, 0.0).block
 
         if (blockUnder.type.isSolid && blockUnder.type in oreBlock) {
-            var location = blockUnder.location
-            location = location.add(0.0, 1.0, 0.0)
+            var location = blockUnder.location.clone()
+            location.add(0.0, 1.0, 0.0)
             
             val maxHeight = plugin.config.getInt("maxHeight", 64)
             var distance = 0
             
-            while (!(location.block.type in oreBlock) && distance < maxHeight) {
-                location = location.add(0.0, 1.0, 0.0)
+            while (distance < maxHeight) {
+                if (location.block.type in oreBlock) {
+                    val feet = location.clone().add(0.0, 1.0, 0.0)
+                    if (isSafe(player, feet)) {
+                        val dest = location.clone().add(0.5, 1.0, 0.5)
+                        dest.yaw = player.location.yaw
+                        dest.pitch = player.location.pitch
+                        player.teleport(dest)
+                        return
+                    }
+                }
+                location.add(0.0, 1.0, 0.0)
                 distance++
             }
-            
-            if (location.block.type in oreBlock) {
-                player.teleport(location.add(0.5, 1.0, 0.5).addRotation(player.location.yaw, player.location.pitch))
-            }
         }
     }
 
@@ -48,20 +56,83 @@ class EventListener(private val plugin: App) : Listener {
         val blockUnder = player.location.subtract(0.0, 1.0, 0.0).block
 
         if (blockUnder.type in oreBlock) {
-            var location = blockUnder.location
-            location = location.subtract(0.0, 1.0, 0.0)
+            var location = blockUnder.location.clone()
+            location.subtract(0.0, 1.0, 0.0)
             
             val maxHeight = plugin.config.getInt("maxHeight", 64)
             var distance = 0
             
-            while (!(location.block.type in oreBlock) && distance < maxHeight) {
-                location = location.subtract(0.0, 1.0, 0.0)
+            while (distance < maxHeight) {
+                if (location.block.type in oreBlock) {
+                    val feet = location.clone().add(0.0, 1.0, 0.0)
+                    if (isSafe(player, feet)) {
+                        val dest = location.clone().add(0.5, 1.0, 0.5)
+                        dest.yaw = player.location.yaw
+                        dest.pitch = player.location.pitch
+                        player.teleport(dest)
+                        return
+                    }
+                }
+                location.subtract(0.0, 1.0, 0.0)
                 distance++
             }
-            
-            if (location.block.type in oreBlock) {
-                player.teleport(location.add(0.5, 1.0, 0.5).addRotation(player.location.yaw, player.location.pitch))
-            }
         }
     }
+
+    private fun isSafe(player: Player, feetLocation: Location): Boolean {
+        val x = feetLocation.blockX + 0.5
+        val y = feetLocation.blockY.toDouble()
+        val z = feetLocation.blockZ + 0.5
+        
+        val playerBox = player.boundingBox
+        val halfW = playerBox.widthX / 2.0
+        val halfD = playerBox.widthZ / 2.0
+        val h = playerBox.height
+        
+        // 足元の座標からプレイヤーの高さ分のBoundingBoxを作成し、全身（上半身含む）の衝突判定を行う
+        val targetBox = org.bukkit.util.BoundingBox(x - halfW, y, z - halfD, x + halfW, y + h, z + halfD)
+        val world = feetLocation.world
+        
+        val minX = kotlin.math.floor(targetBox.minX).toInt()
+        val maxX = kotlin.math.ceil(targetBox.maxX).toInt()
+        val minY = kotlin.math.floor(targetBox.minY).toInt()
+        val maxY = kotlin.math.ceil(targetBox.maxY).toInt()
+        val minZ = kotlin.math.floor(targetBox.minZ).toInt()
+        val maxZ = kotlin.math.ceil(targetBox.maxZ).toInt()
+
+        for (bx in minX..maxX) {
+            for (by in minY..maxY) {
+                for (bz in minZ..maxZ) {
+                    val block = world.getBlockAt(bx, by, bz)
+                    if (block.isEmpty) continue
+                    
+                    val voxelShape = block.collisionShape
+                    for (box in voxelShape.boundingBoxes as Collection<BoundingBox>) {
+                        val absBox = box.clone().shift(bx.toDouble(), by.toDouble(), bz.toDouble())
+                        
+                        // 先に交差判定を行う
+                        if (!targetBox.overlaps(absBox)) continue
+
+                        // カーペット(高さ <= 0.0625)や開いた/下付きトラップドアのような軽微な衝突は無視する
+                        // 物体が大きく遮っている場合はテレポートを阻止する
+                        // カーペットの高さは0.0625。下付きトラップドアは通常0.1875。
+                        // 足元の障害物が最小限であればテレポートを許可する。
+
+                        val intersection = targetBox.clone().intersection(absBox)
+                        val intHeight = intersection.height
+                        
+                        // 交差が非常に小さい場合（カーペットに触れている程度など）は許可する
+                        // 足元にあり、高さが0.2未満（トラップドアは約0.1875）であれば許容する
+                        val isAtFeetLevel = (absBox.minY - y) < 0.1
+                        if (isAtFeetLevel && absBox.height < 0.2) {
+                            continue
+                        }
+
+                        return false
+                    }
+                }
+            }
+        }
+        return true
+    }
 }