// --- 2. UPDATED LIGHTING ---
const ambientLight = new THREE.AmbientLight(0xffffff, 0.4);
scene.add(ambientLight);

const sun = new THREE.DirectionalLight(0xffffff, 1.0);
sun.position.set(0, 20, 0); // Start at high noon
scene.add(sun);

// Create a visual sun sphere
const sunGeo = new THREE.SphereGeometry(2, 16, 16);
const sunMat = new THREE.MeshBasicMaterial({ color: 0xfff5b1 });
const sunSphere = new THREE.Mesh(sunGeo, sunMat);
scene.add(sunSphere);

// --- 8. UPDATED GAME LOOP ---
let prevTime = performance.now();
let dayCycle = 0; // Tracks time

function animate() {
    requestAnimationFrame(animate);
    const time = performance.now();
    const delta = (time - prevTime) / 1000;

    // --- DAY/NIGHT CALCULATIONS ---
    dayCycle += delta * 0.1; // Adjust 0.1 to make days faster or slower
    
    // Move sun in a circle
    const sunDist = 40;
    sun.position.x = Math.cos(dayCycle) * sunDist;
    sun.position.y = Math.sin(dayCycle) * sunDist;
    sunSphere.position.copy(sun.position);

    // Change Sky Color & Light Intensity based on sun height
    const sunHeight = Math.sin(dayCycle); // Ranges from -1 to 1
    
    if (sunHeight > 0) {
        // Day time
        scene.background.setHSL(0.55, 0.5, 0.5 + sunHeight * 0.3);
        scene.fog.color.copy(scene.background);
        sun.intensity = sunHeight;
    } else {
        // Night time
        scene.background.setHSL(0.6, 0.5, 0.1); // Dark blue/black
        scene.fog.color.copy(scene.background);
        sun.intensity = 0;
    }

    // --- PLAYER PHYSICS & MOVEMENT ---
    if (controls.isLocked) {
        velocity.x -= velocity.x * 10 * delta;
        velocity.z -= velocity.z * 10 * delta;
        velocity.y -= 30 * delta; 

        if (moveFwd) velocity.z += 120 * delta;
        if (moveBwd) velocity.z -= 120 * delta;
        if (moveL) velocity.x -= 120 * delta;
        if (moveR) velocity.x += 120 * delta;

        controls.moveRight(velocity.x * delta);
        controls.moveForward(velocity.z * delta);
        camera.position.y += velocity.y * delta;

        // Ground Collision
        if (camera.position.y < 2.5) {
            velocity.y = 0;
            camera.position.y = 2.5;
            canJump = true;
        }

        // Raycasting for highlight
        raycaster.setFromCamera(new THREE.Vector2(0, 0), camera);
        const intersects = raycaster.intersectObjects(blocks);
        if (intersects.length > 0) {
            highlightBox.position.copy(intersects[0].object.position);
            highlightBox.visible = true;
        } else {
            highlightBox.visible = false;
        }
    }

    prevTime = time;
    renderer.render(scene, camera);
}