fix(c4): C4 item could not use

src/startup_scripts/C4.js

@@ -1,16 +1,46 @@
 const KeyMapping = Java.loadClass("net.minecraft.client.KeyMapping");
 
-const C4_EXPLOSION_TIME = 3 * 20;
-const C4_EXPLOSION_RANGE = 256;
+const C4_EXPLOSION_TIME = 3 * 20; // 3 seconds in ticks
+const C4_EXPLOSION_POWER = 4; // Explosion power (TNT is 4)
+
+// Tolerance for floating point comparison
+const ANGLE_TOLERANCE = 0.001;
+const POS_TOLERANCE = 0.01;
 
 /**
  * @type {{ [key: string]:{
  *  angle: {x: number, y:number, z:number},
- *  pos: {x: number, y: number, z: number}
+ *  pos: {x: number, y: number, z: number},
+ *  blockPos: {x: number, y: number, z: number}
  * } | undefined}}
  */
 const lastPlayerInfoMap = {};
 
+/**
+ * Helper function to compare floating point numbers with tolerance
+ * @param {number} a
+ * @param {number} b
+ * @param {number} tolerance
+ * @returns {boolean}
+ */
+function isApproximatelyEqual(a, b, tolerance) {
+    return Math.abs(a - b) <= tolerance;
+}
+
+/**
+ * Get the block position under the player
+ * @param {Internal.Player} player
+ * @returns {{x: number, y: number, z: number}}
+ */
+function getBlockUnderPlayer(player) {
+    const playerPos = player.position();
+    return {
+        x: Math.floor(playerPos.x()),
+        y: Math.floor(playerPos.y()) - 1,
+        z: Math.floor(playerPos.z()),
+    };
+}
+
 /**
  * @param {Internal.ItemStack} itemstack
  * @param {Internal.Level} level
@@ -18,23 +48,60 @@ const lastPlayerInfoMap = {};
  * @returns {boolean}
  */
 function shouldActivateC4(itemstack, level, player) {
-    const playerPos = player.position();
-    const block = level.getBlock(
-        playerPos.x() - 1, // Must subtract 1, is it a Bug ???
-        playerPos.y() - 1, // The block under the player
-        playerPos.z(),
-    );
+    const blockUnder = getBlockUnderPlayer(player);
+    const block = level.getBlock(blockUnder.x, blockUnder.y, blockUnder.z);
 
     const lookAngle = player.lookAngle;
+    const playerPos = player.position();
     const lastPlayerInfo = lastPlayerInfoMap[player.uuid.toString()];
+
     if (lastPlayerInfo === undefined) return false;
+
+    // Check if player moved (using block position for stability)
+    const currentBlockPos = getBlockUnderPlayer(player);
+    const isBlockPosChanged =
+        currentBlockPos.x !== lastPlayerInfo.blockPos.x ||
+        currentBlockPos.y !== lastPlayerInfo.blockPos.y ||
+        currentBlockPos.z !== lastPlayerInfo.blockPos.z;
+
+    // Check if player moved within the same block (with tolerance)
+    const isPosChanged =
+        !isApproximatelyEqual(
+            playerPos.x(),
+            lastPlayerInfo.pos.x,
+            POS_TOLERANCE,
+        ) ||
+        !isApproximatelyEqual(
+            playerPos.y(),
+            lastPlayerInfo.pos.y,
+            POS_TOLERANCE,
+        ) ||
+        !isApproximatelyEqual(
+            playerPos.z(),
+            lastPlayerInfo.pos.z,
+            POS_TOLERANCE,
+        );
+
+    // Check if player rotated view (with tolerance)
+    const isAngleChanged =
+        !isApproximatelyEqual(
+            lookAngle.x(),
+            lastPlayerInfo.angle.x,
+            ANGLE_TOLERANCE,
+        ) ||
+        !isApproximatelyEqual(
+            lookAngle.y(),
+            lastPlayerInfo.angle.y,
+            ANGLE_TOLERANCE,
+        ) ||
+        !isApproximatelyEqual(
+            lookAngle.z(),
+            lastPlayerInfo.angle.z,
+            ANGLE_TOLERANCE,
+        );
+
     const isPlayerInfoChanged =
-        lookAngle.x() !== lastPlayerInfo.angle.x ||
-        lookAngle.y() !== lastPlayerInfo.angle.y ||
-        lookAngle.z() !== lastPlayerInfo.angle.z ||
-        playerPos.x() !== lastPlayerInfo.pos.x ||
-        playerPos.y() !== lastPlayerInfo.pos.y ||
-        playerPos.z() !== lastPlayerInfo.pos.z;
+        isBlockPosChanged || isPosChanged || isAngleChanged;
 
     return (
         /** @type {string} */ (block.id) === "kubejs:c4_target" &&
@@ -65,7 +132,6 @@ StartupEvents.registry("block", (event) => {
         .displayName(/** @type {any} */ ("C4")); // Set a custom name
 });
 
-let c4PlacedGameTime = 0;
 StartupEvents.registry("item", (event) => {
     event
         .create("c4_item")
@@ -73,18 +139,18 @@ StartupEvents.registry("item", (event) => {
         .useAnimation("eat")
         .useDuration((_itemStack) => 100) // 5 Seconds
         .use((level, player, _hand) => {
-            const playerPos = player.position();
+            const blockUnder = getBlockUnderPlayer(player);
             const block = level.getBlock(
-                playerPos.x() - 1, // Must subtract 1, is it a Bug ???
-                playerPos.y() - 1, // The block under the player
-                playerPos.z(),
+                blockUnder.x,
+                blockUnder.y,
+                blockUnder.z,
             );
 
             if (/** @type {string} */ (block.id) !== "kubejs:c4_target") {
                 return false;
             }
 
-            // const itemstack = player.getUseItem();
+            const playerPos = player.position();
             const lookAngle = player.lookAngle;
             lastPlayerInfoMap[player.uuid.toString()] = {
                 angle: {
@@ -97,30 +163,44 @@ StartupEvents.registry("item", (event) => {
                     y: playerPos.y(),
                     z: playerPos.z(),
                 },
+                blockPos: blockUnder,
             };
 
-            // console.log(`Map count: ${lastPlayerInfoMap.size}`);
             console.log(`Player UUID: ${player.uuid}`);
             console.log(
-                `Player Info: ${lastPlayerInfoMap[player.uuid.toString()]}`,
+                `Player Info: ${JSON.stringify(lastPlayerInfoMap[player.uuid.toString()])}`,
             );
 
             const server = Utils.server;
             server.scheduleInTicks(5, (event) => {
                 const itemstack = player.getUseItem();
+
+                // Check if player is still using the item
+                if (
+                    itemstack === undefined ||
+                    /** @type {string} */ (itemstack.id) !== "kubejs:c4_item"
+                ) {
+                    return;
+                }
+
                 if (!shouldActivateC4(itemstack, level, player)) {
                     player.stopUsingItem();
                     player.addItemCooldown(itemstack.getItem(), 20);
                     itemstack.resetHoverName();
+                    delete lastPlayerInfoMap[player.uuid.toString()];
                     return;
                 }
 
-                const useDuration = itemstack.useDuration;
-                if (useDuration <= 0) return;
+                // Get remaining ticks for this use
+                const ticksUsingItem = player.getTicksUsingItem();
+                const remainingTicks = 100 - ticksUsingItem; // useDuration is 100
+
+                // if (remainingTicks <= 0) return;
+
                 itemstack.setHoverName(
                     /** @type {any} */ (
                         Component.literal(
-                            `C4 - ${(useDuration / 20.0).toFixed(2)}s`,
+                            `C4 - ${(remainingTicks / 20.0).toFixed(2)}s`,
                         )
                     ),
                 );
@@ -136,46 +216,78 @@ StartupEvents.registry("item", (event) => {
                 return itemstack;
             }
 
-            if (
-                !shouldActivateC4(itemstack, level, /** @type {any} */ (entity))
-            ) {
+            /** @type {Internal.Player} */
+            const player = /** @type {any} */ (entity);
+
+            if (!shouldActivateC4(itemstack, level, player)) {
+                itemstack.resetHoverName();
+                delete lastPlayerInfoMap[player.uuid.toString()];
                 return itemstack; // Do nothing
             }
 
-            const playerPos = entity.position();
-            const newBlock = level.getBlock(playerPos);
+            // Place C4 at player's feet
+            const playerPos = player.position();
+            const c4BlockPos = {
+                x: Math.floor(playerPos.x()),
+                y: Math.floor(playerPos.y()),
+                z: Math.floor(playerPos.z()),
+            };
+            const newBlock = level.getBlock(
+                c4BlockPos.x,
+                c4BlockPos.y,
+                c4BlockPos.z,
+            );
             newBlock.set(/** @type {any} */ ("kubejs:c4"));
 
             itemstack.shrink(1);
             itemstack.resetHoverName();
+            delete lastPlayerInfoMap[player.uuid.toString()];
 
             const server = level.server;
-            c4PlacedGameTime = level.levelData.getGameTime();
+            const c4PlacedGameTime = level.levelData.getGameTime();
+
+            // Store block position for explosion (capture in closure)
+            const explosionX = c4BlockPos.x;
+            const explosionY = c4BlockPos.y;
+            const explosionZ = c4BlockPos.z;
+
             server.scheduleInTicks(20, (event) => {
-                const gameTime = level.levelData.getGameTime();
-                const explosionRestTime =
-                    C4_EXPLOSION_RANGE - gameTime - c4PlacedGameTime;
+                const currentGameTime = level.levelData.getGameTime();
+                const elapsedTime = currentGameTime - c4PlacedGameTime;
+                const explosionRestTime = C4_EXPLOSION_TIME - elapsedTime;
+
                 if (explosionRestTime > 0) {
-                    server.players.forEach((player) => {
-                        player.tell(
+                    server.players.forEach((p) => {
+                        p.tell(
                             /** @type {any} */ (
                                 Component.literal(
-                                    `C4还剩 ${Math.floor(explosionRestTime / 20)} 秒爆炸`,
+                                    `C4还剩 ${Math.ceil(explosionRestTime / 20)} 秒爆炸`,
                                 )
                             ),
                         );
                     });
-                    event.reschedule(20);
+                    event.reschedule();
                 } else {
-                    const blockPos = newBlock.pos;
-                    level.explode(
-                        /** @type {any} */ (null),
-                        blockPos.x,
-                        blockPos.y,
-                        blockPos.z,
-                        C4_EXPLOSION_RANGE,
-                        "block",
+                    // Check if C4 block is still there before exploding
+                    const c4Block = level.getBlock(
+                        explosionX,
+                        explosionY,
+                        explosionZ,
                     );
+                    if (/** @type {string} */ (c4Block.id) === "kubejs:c4") {
+                        // Remove the C4 block first
+                        c4Block.set(/** @type {any} */ ("minecraft:air"));
+
+                        // Create explosion
+                        level.explode(
+                            /** @type {any} */ (null),
+                            explosionX + 0.5,
+                            explosionY + 0.5,
+                            explosionZ + 0.5,
+                            C4_EXPLOSION_POWER,
+                            "block",
+                        );
+                    }
                 }
             });