From 558640451244378243583c3634491b27d2c4072b Mon Sep 17 00:00:00 2001
From: DBotThePony <dbotthepony@yandex.ru>
Date: Thu, 13 Oct 2022 16:36:28 +0700
Subject: [PATCH] Phase through walls

---
 .../android/feature/EnderTeleporterFeature.kt | 75 ++++++++++++++++++-
 1 file changed, 73 insertions(+), 2 deletions(-)

diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/android/feature/EnderTeleporterFeature.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/android/feature/EnderTeleporterFeature.kt
index 4e0cf3410..6cae8a748 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/android/feature/EnderTeleporterFeature.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/android/feature/EnderTeleporterFeature.kt
@@ -7,6 +7,7 @@ import net.minecraft.ChatFormatting
 import net.minecraft.client.renderer.LevelRenderer
 import net.minecraft.core.BlockPos
 import net.minecraft.core.Direction
+import net.minecraft.core.Vec3i
 import net.minecraft.nbt.CompoundTag
 import net.minecraft.resources.ResourceLocation
 import net.minecraft.server.level.ServerPlayer
@@ -50,6 +51,7 @@ import ru.dbotthepony.mc.otm.core.times
 import ru.dbotthepony.mc.otm.registry.AndroidFeatures
 import ru.dbotthepony.mc.otm.registry.MNames
 import ru.dbotthepony.mc.otm.triggers.EnderTeleporterFallDeathTrigger
+import java.util.LinkedList
 import kotlin.math.sin
 
 class EnderTeleporterFeature(capability: MatteryPlayerCapability) : AndroidActiveFeature(AndroidFeatures.ENDER_TELEPORTER, capability) {
@@ -120,6 +122,31 @@ class EnderTeleporterFeature(capability: MatteryPlayerCapability) : AndroidActiv
 		}
 	}
 
+	private fun tryToPhaseThroughWall(blockPos: BlockPos, normal: Vec3i, phasedBlocks: MutableList<BlockPos>): TraceResult? {
+		phasedBlocks.clear()
+		phasedBlocks.add(blockPos)
+
+		for (extend in 1 .. ServerConfig.EnderTeleporter.MAX_PHASE_DISTANCE) {
+			val pos = blockPos + normal * extend
+
+			if (isAirGap(pos)) {
+				for (y in 0 .. ServerConfig.EnderTeleporter.MAX_PHASE_DISTANCE - extend) {
+					val newPos = BlockPos(pos.x, pos.y - y, pos.z)
+
+					if (isValidPosition(newPos)) {
+						return TraceResult(newPos, phasedBlocks)
+					} else {
+						phasedBlocks.add(newPos)
+					}
+				}
+			} else {
+				phasedBlocks.add(pos)
+			}
+		}
+
+		return null
+	}
+
 	private fun trace(): TraceResult {
 		val headPosition = ply.eyePosition
 		val aimVector = ply.getViewVector(1f)
@@ -146,6 +173,30 @@ class EnderTeleporterFeature(capability: MatteryPlayerCapability) : AndroidActiv
 			return TraceResult(result.blockPos.above())
 		}
 
+		val candidates = LinkedList<TraceResult>()
+
+		if (result.direction != Direction.UP && result.direction != Direction.DOWN && !isAirGap(result.blockPos) && ply.xRot in -15f .. 15f) {
+			val (vx, vy, vz) = ply.getViewVector(1f)
+			val nearest = Direction.getNearest(vx, vy, vz)
+
+			if (nearest != Direction.UP && nearest != Direction.DOWN) {
+				// attempt one
+				val phasedBlocks = ArrayList<BlockPos>(ServerConfig.EnderTeleporter.MAX_PHASE_DISTANCE)
+				var phaseResult = tryToPhaseThroughWall(result.blockPos, nearest.normal, phasedBlocks)
+
+				if (phaseResult != null) {
+					candidates.add(phaseResult)
+				}
+
+				// attempt two
+				phaseResult = tryToPhaseThroughWall(result.blockPos, result.direction.opposite.normal, phasedBlocks)
+
+				if (phaseResult != null) {
+					candidates.add(phaseResult)
+				}
+			}
+		}
+
 		for (y in (if (ply.level.getBlockState(result.blockPos).`is`(BlockTags.CLIMBABLE)) -1 else 0) .. ServerConfig.EnderTeleporter.MAX_PHASE_DISTANCE) {
 			val pos = BlockPos(result.blockPos.x, result.blockPos.y + y + 1, result.blockPos.z)
 
@@ -155,10 +206,30 @@ class EnderTeleporterFeature(capability: MatteryPlayerCapability) : AndroidActiv
 			}
 
 			if (isValidPosition(pos) && shortestDistanceBetween(testPositions, pos.asVector()) <= ServerConfig.EnderTeleporter.MAX_DISTANCE) {
-				return TraceResult(pos, if (y != 0) ImmutableList(y + 1) { result.blockPos + BlockPos(0, it, 0) } else listOf())
+				candidates.add(TraceResult(pos, if (y != 0) ImmutableList(y + 1) { result.blockPos + BlockPos(0, it, 0) } else listOf()))
+				break
 			}
 		}
 
+		if (candidates.isNotEmpty()) {
+			var candiate = candidates.first
+			var distance = candiate.pos!!.distSqr(result.blockPos)
+
+			val iterator = candidates.listIterator()
+			iterator.next()
+
+			for (next in iterator) {
+				val newDistance = next.pos!!.distSqr(result.blockPos)
+
+				if (newDistance < distance) {
+					candiate = next
+					distance = newDistance
+				}
+			}
+
+			return candiate
+		}
+
 		// no valid positions...
 		if (isAirGap(result.blockPos)) {
 			// try to find ground below...
@@ -187,7 +258,7 @@ class EnderTeleporterFeature(capability: MatteryPlayerCapability) : AndroidActiv
 		val (blockPos) = trace()
 		blockPos ?: return false
 
-		cooldown = ServerConfig.EnderTeleporter.COOLDOWN
+		// cooldown = ServerConfig.EnderTeleporter.COOLDOWN
 
 		val server = ply.server