class ZombieSpawner {
    constructor(scene, gridX, gridY, spawnRadius = 5, maxZombies = 3, respawnTime = 30000) {
        this.scene = scene;
        this.gridX = gridX;
        this.gridY = gridY;
        this.spawnRadius = spawnRadius;
        this.maxZombies = maxZombies;
        this.respawnTime = respawnTime;
        this.spawnedZombies = [];
        this.respawnTimer = 0;
        this.isActive = true;

        this.createVisual();
    }

    createVisual() {
        const screenPos = this.scene.iso.toScreen(this.gridX, this.gridY);
        const x = screenPos.x + this.scene.terrainOffsetX;
        const y = screenPos.y + this.scene.terrainOffsetY;

        // Spawner sprite (dark portal/grave)
        this.sprite = this.scene.add.sprite(x, y, 'gravestone');
        this.sprite.setOrigin(0.5, 1);
        this.sprite.setDepth(this.scene.iso.getDepth(this.gridX, this.gridY, this.scene.iso.LAYER_OBJECTS));
        this.sprite.setTint(0x440044); // Purple tint for spawner

        // Pulsing effect
        this.scene.tweens.add({
            targets: this.sprite,
            alpha: 0.6,
            duration: 1000,
            yoyo: true,
            repeat: -1
        });
    }

    spawn() {
        if (this.spawnedZombies.length >= this.maxZombies) return;

        // Random position around spawner
        const offsetX = Phaser.Math.Between(-this.spawnRadius, this.spawnRadius);
        const offsetY = Phaser.Math.Between(-this.spawnRadius, this.spawnRadius);
        const spawnX = this.gridX + offsetX;
        const spawnY = this.gridY + offsetY;

        // Create zombie
        const zombie = new NPC(
            this.scene,
            spawnX,
            spawnY,
            this.scene.terrainOffsetX,
            this.scene.terrainOffsetY,
            'zombie'
        );

        zombie.spawner = this; // Reference back to spawner
        this.spawnedZombies.push(zombie);
        this.scene.npcs.push(zombie);

        // Spawn effect
        this.scene.events.emit('show-floating-text', {
            x: spawnX * 48,
            y: spawnY * 48,
            text: '💀 Spawn!',
            color: '#FF00FF'
        });

        if (this.scene.soundManager) {
            this.scene.soundManager.playHit(); // Re-use hit sound for spawn
        }

        console.log(`👹 Spawner at ${this.gridX},${this.gridY} spawned zombie`);
    }

    removeZombie(zombie) {
        const index = this.spawnedZombies.indexOf(zombie);
        if (index > -1) {
            this.spawnedZombies.splice(index, 1);
        }
    }

    update(delta) {
        if (!this.isActive) return;

        // Clean up dead zombies
        this.spawnedZombies = this.spawnedZombies.filter(z =>
            this.scene.npcs.includes(z) && z.hp > 0
        );

        // Respawn check
        if (this.spawnedZombies.length < this.maxZombies) {
            this.respawnTimer += delta;
            if (this.respawnTimer >= this.respawnTime) {
                this.respawnTimer = 0;
                this.spawn();
            }
        }
    }

    destroy() {
        if (this.sprite) this.sprite.destroy();
        if (this.particles) this.particles.destroy();
    }
}