FAZA 3: Add 3 NPCs with random walk AI (zombie, villager, merchant)

src/entities/NPC.js

@@ -0,0 +1,147 @@
+// NPC Entity
+// NPC z random walk AI in isometrično podporo
+class NPC {
+    constructor(scene, gridX, gridY, offsetX = 0, offsetY = 0, type = 'zombie') {
+        this.scene = scene;
+        this.gridX = gridX;
+        this.gridY = gridY;
+        this.type = type;
+
+        // Terrain offset
+        this.offsetX = offsetX;
+        this.offsetY = offsetY;
+
+        this.iso = new IsometricUtils(48, 24);
+
+        // Random walk paramters
+        this.moveSpeed = 100; // px/s (počasnejše od igralca)
+        this.gridMoveTime = 300; // ms za premik (počasneje)
+
+        // Stanje
+        this.isMoving = false;
+        this.pauseTime = 0;
+        this.maxPauseTime = 2000; // Pavza med premiki (2s)
+
+        // Kreira sprite
+        this.createSprite();
+
+        // Začetna pozicija
+        this.updatePosition();
+
+        // Naključna začetna pavza
+        this.pauseTime = Math.random() * this.maxPauseTime;
+    }
+
+    createSprite() {
+        // Generiraj NPC teksturo glede na tip
+        const texKey = `npc_${this.type}`;
+
+        if (!this.scene.textures.exists(texKey)) {
+            TextureGenerator.createNPCSprite(this.scene, texKey, this.type);
+        }
+
+        // Kreira sprite
+        const screenPos = this.iso.toScreen(this.gridX, this.gridY);
+        this.sprite = this.scene.add.sprite(
+            screenPos.x + this.offsetX,
+            screenPos.y + this.offsetY,
+            texKey
+        );
+        this.sprite.setOrigin(0.5, 1); // Anchor na dnu sprite-a
+
+        // Depth sorting
+        this.updateDepth();
+    }
+
+    update(delta) {
+        if (this.isMoving) {
+            return; // Že se premika
+        }
+
+        // Random walk - pavza med premiki
+        this.pauseTime += delta;
+
+        if (this.pauseTime >= this.maxPauseTime) {
+            this.performRandomWalk();
+            this.pauseTime = 0;
+        }
+    }
+
+    performRandomWalk() {
+        // Naključna smer (NSEW + možnost obstati)
+        const directions = [
+            { x: -1, y: 0 },  // North-West
+            { x: 1, y: 0 },   // South-East
+            { x: 0, y: -1 },  // South-West
+            { x: 0, y: 1 },   // North-East
+            { x: 0, y: 0 }    // Stay (30% možnost)
+        ];
+
+        const dir = Phaser.Math.RND.pick(directions);
+        const targetX = this.gridX + dir.x;
+        const targetY = this.gridY + dir.y;
+
+        // Preveri kolizijo z robovi
+        const terrainSystem = this.scene.terrainSystem;
+        if (terrainSystem && this.iso.isInBounds(targetX, targetY, terrainSystem.width, terrainSystem.height)) {
+            // Preveri da ni ista pozicija kot igralec
+            if (this.scene.player) {
+                const playerPos = this.scene.player.getPosition();
+                if (targetX === playerPos.x && targetY === playerPos.y) {
+                    return; // Ne premakni se na igralca
+                }
+            }
+
+            if (dir.x !== 0 || dir.y !== 0) {
+                this.moveToGrid(targetX, targetY);
+            }
+        }
+    }
+
+    moveToGrid(targetX, targetY) {
+        this.isMoving = true;
+        this.gridX = targetX;
+        this.gridY = targetY;
+
+        const targetScreen = this.iso.toScreen(targetX, targetY);
+
+        // Tween za smooth gibanje
+        this.scene.tweens.add({
+            targets: this.sprite,
+            x: targetScreen.x + this.offsetX,
+            y: targetScreen.y + this.offsetY,
+            duration: this.gridMoveTime,
+            ease: 'Linear',
+            onComplete: () => {
+                this.isMoving = false;
+            }
+        });
+
+        // Posodobi depth
+        this.updateDepth();
+    }
+
+    updatePosition() {
+        const screenPos = this.iso.toScreen(this.gridX, this.gridY);
+        this.sprite.setPosition(
+            screenPos.x + this.offsetX,
+            screenPos.y + this.offsetY
+        );
+        this.updateDepth();
+    }
+
+    updateDepth() {
+        const depth = this.iso.getDepth(this.gridX, this.gridY);
+        this.sprite.setDepth(depth + 1000); // +1000 da je nad terenom
+    }
+
+    getPosition() {
+        return { x: this.gridX, y: this.gridY };
+    }
+
+    destroy() {
+        if (this.sprite) {
+            this.sprite.destroy();
+        }
+    }
+}