import * as THREE from 'three';
import { state } from '../state.js';

let cauldronParticles;
let cauldronLight;
const particleCount = 8;
const particleVelocities = [];

export function createCauldron(x, y, z) {
    const cauldronGroup = new THREE.Group();

    const cauldronRadius = 0.2;
    const cauldronHeight = 0.25;

    // 1. Cauldron Body
    const cauldronMaterial = new THREE.MeshPhongMaterial({ color: 0x111111, shininess: 80 });
    // Use a sphere geometry cut in half for the bowl shape
    const cauldronGeo = new THREE.SphereGeometry(cauldronRadius, 32, 16, 0, Math.PI * 2, 0, Math.PI / 2);
    const cauldronMesh = new THREE.Mesh(cauldronGeo, cauldronMaterial);
    cauldronMesh.castShadow = true;
    cauldronMesh.rotation.z = Math.PI;
    cauldronGroup.add(cauldronMesh);

    // 2. Glowing Liquid Surface
    const liquidColor = 0x00ff00; // Bright green
    const liquidMaterial = new THREE.MeshPhongMaterial({
        color: liquidColor,
        emissive: liquidColor,
        emissiveIntensity: 0.6,
        shininess: 100
    });
    const liquidGeo = new THREE.CircleGeometry(cauldronRadius * 0.95, 32);
    const liquidSurface = new THREE.Mesh(liquidGeo, liquidMaterial);
    liquidSurface.rotation.x = -Math.PI / 2;
    liquidSurface.position.y = -0.01; // Slightly below the rim
    cauldronGroup.add(liquidSurface);

    // 3. Bubbling Particles
    const particleGeo = new THREE.BufferGeometry();
    const positions = new Float32Array(particleCount * 3);

    for (let i = 0; i < particleCount; i++) {
        positions[i * 3] = (Math.random() - 0.5) * cauldronRadius * 1.5;
        positions[i * 3 + 1] = (Math.random() - 0.5) * 0.05; // Start near the surface
        positions[i * 3 + 2] = (Math.random() - 0.5) * cauldronRadius * 1.5;
        particleVelocities.push((0.05 + Math.random() * 0.1) / 60); // Random upward velocity
    }
    particleGeo.setAttribute('position', new THREE.BufferAttribute(positions, 3));

    const particleMaterial = new THREE.PointsMaterial({
        color: liquidColor,
        size: 0.015,
        transparent: true,
        blending: THREE.AdditiveBlending,
        depthWrite: false,
        opacity: 0.7
    });

    cauldronParticles = new THREE.Points(particleGeo, particleMaterial);
    cauldronGroup.add(cauldronParticles);

    // 4. Light from the cauldron
    cauldronLight = new THREE.PointLight(liquidColor, 0.8, 3);
    cauldronLight.position.y = 0.2;
    cauldronLight.castShadow = true;
    cauldronGroup.add(cauldronLight);

    // Position and add to scene
    cauldronGroup.position.set(x, y, z);
    state.scene.add(cauldronGroup);
}

export function updateCauldron() {
    if (!cauldronParticles || !cauldronLight) return;

    // Animate Bubbles
    const positions = cauldronParticles.geometry.attributes.position.array;
    const bubbleMaxHeight = 0.1;
    const overfly = Math.random() * bubbleMaxHeight;

    for (let i = 0; i < particleCount; i++) {
        positions[i * 3 + 1] += particleVelocities[i]; // Move bubble up

        // Reset bubble if it goes too high
        if (positions[i * 3 + 1] > bubbleMaxHeight + overfly) {
            positions[i * 3 + 1] = (Math.random() - 0.5) * 0.05;
            // Give it a new random X/Z position
            positions[i * 3] = (Math.random() - 0.5) * 0.2 * 1.5;
            positions[i * 3 + 2] = (Math.random() - 0.5) * 0.2 * 1.5;
        }
    }
    cauldronParticles.geometry.attributes.position.needsUpdate = true;

    // Flicker Light
    const flicker = Math.random() * 0.02;
    cauldronLight.intensity = 0.1 + flicker;
}