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<!DOCTYPE html>
<html>
<head>
  <title>Ultimate Rocket Builder</title>
  <style>
    body { margin:0; overflow:hidden; }
    button {
      position:absolute;
      padding:8px 12px;
      font-size:14px;
      cursor:pointer;
      z-index:2;
    }
    #engineBtn { top:10px; left:10px; }
    #fuelBtn { top:10px; left:120px; }
    #finBtn { top:10px; left:250px; }
    #boosterBtn { top:10px; left:350px; }
    #capsuleBtn { top:10px; left:470px; }
    #launchBtn { top:10px; left:600px; }
    #altitude {
      position:absolute;
      top:50px;
      left:10px;
      font-size:18px;
      color:white;
      z-index:2;
    }
  </style>
</head>
<body>

<button id="engineBtn">Engine</button>
<button id="fuelBtn">Fuel</button>
<button id="finBtn">Fins</button>
<button id="boosterBtn">Booster</button>
<button id="capsuleBtn">Capsule</button>
<button id="launchBtn">Launch</button>
<div id="altitude">Height: 0 m</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three@0.128/examples/js/controls/OrbitControls.js"></script>

<script>
let scene = new THREE.Scene();
scene.background = new THREE.Color(0x444444);

let camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 100000);
camera.position.set(0,10,30);

let renderer = new THREE.WebGLRenderer({antialias:true});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

let controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.enablePan = false;

// LIGHT
let light = new THREE.PointLight(0xffffff,2);
light.position.set(0,30,30);
scene.add(light);

// FLOOR
let floor = new THREE.Mesh(
  new THREE.PlaneGeometry(200,200),
  new THREE.MeshStandardMaterial({color:0x777777})
);
floor.rotation.x=-Math.PI/2;
scene.add(floor);

// STARS
let starGeo=new THREE.BufferGeometry();
let starVertices=[];
for(let i=0;i<4000;i++){
  starVertices.push(
    THREE.MathUtils.randFloatSpread(50000),
    THREE.MathUtils.randFloatSpread(50000),
    THREE.MathUtils.randFloatSpread(50000)
  );
}
starGeo.setAttribute('position',
  new THREE.Float32BufferAttribute(starVertices,3));
let stars=new THREE.Points(
  starGeo,
  new THREE.PointsMaterial({color:0xffffff})
);
stars.visible=false;
scene.add(stars);

// ROCKET
let rocket=new THREE.Group();
scene.add(rocket);

let currentHeight=4;
let thrust=0,fuel=0,velocity=0,gravity=0.02;
let launched=false,buildMode=true;

let body=new THREE.Mesh(
  new THREE.CylinderGeometry(1,1,4,32),
  new THREE.MeshStandardMaterial({color:0xffffff})
);
body.position.y=2;
rocket.add(body);

let nose=new THREE.Mesh(
  new THREE.ConeGeometry(1,2,32),
  new THREE.MeshStandardMaterial({color:0x00ccff})
);
rocket.add(nose);

let fire=new THREE.Mesh(
  new THREE.ConeGeometry(0.8,2,32),
  new THREE.MeshBasicMaterial({color:0xffaa00})
);
fire.position.y=-1;
fire.visible=false;
rocket.add(fire);

function updateNose(){
  nose.position.y=currentHeight+1;
}
updateNose();

function addEngine(){
  let engine=new THREE.Mesh(
    new THREE.CylinderGeometry(0.8,1,1,32),
    new THREE.MeshStandardMaterial({color:0x333333})
  );
  engine.position.y=0.5;
  rocket.add(engine);
  thrust+=0.5;
}

function addFuel(){
  let tank=new THREE.Mesh(
    new THREE.CylinderGeometry(1,1,2,32),
    new THREE.MeshStandardMaterial({color:0xff4444})
  );
  tank.position.y=currentHeight+1;
  rocket.add(tank);
  currentHeight+=2;
  fuel+=80;
  updateNose();
}

function addFins(){
  let finGeo=new THREE.BoxGeometry(0.3,1,1);
  let finMat=new THREE.MeshStandardMaterial({color:0xff0000});
  let fin1=new THREE.Mesh(finGeo,finMat);
  fin1.position.set(1,1,0);
  rocket.add(fin1);
  let fin2=fin1.clone();
  fin2.position.set(-1,1,0);
  rocket.add(fin2);
}

function addBooster(){
  let booster=new THREE.Mesh(
    new THREE.CylinderGeometry(0.5,0.5,3,32),
    new THREE.MeshStandardMaterial({color:0xaaaaaa})
  );
  booster.position.set(2,2,0);
  rocket.add(booster);
  thrust+=0.8;
}

function addCapsule(){
  let capsule=new THREE.Mesh(
    new THREE.SphereGeometry(1,32,32),
    new THREE.MeshStandardMaterial({color:0xffffff})
  );
  capsule.position.y=currentHeight+2;
  rocket.add(capsule);
}

document.getElementById("engineBtn").onclick=()=>{if(buildMode)addEngine();}
document.getElementById("fuelBtn").onclick=()=>{if(buildMode)addFuel();}
document.getElementById("finBtn").onclick=()=>{if(buildMode)addFins();}
document.getElementById("boosterBtn").onclick=()=>{if(buildMode)addBooster();}
document.getElementById("capsuleBtn").onclick=()=>{if(buildMode)addCapsule();}
document.getElementById("launchBtn").onclick=()=>{
  if(fuel>0 && thrust>0){
    launched=true;
    buildMode=false;
    scene.background=new THREE.Color(0x87CEEB);
  } else alert("Add Engine & Fuel First!");
};

function animate(){
  requestAnimationFrame(animate);

  if(launched){
    if(fuel>0){
      velocity+=thrust;
      fuel-=0.5;
      fire.visible=true;
    }else{
      fire.visible=false;
    }

    velocity-=gravity;

    // Parachute slow landing
    if(rocket.position.y<100 && velocity<0){
      velocity*=0.95;
    }

    rocket.position.y+=velocity;

    // Crash detection
    if(rocket.position.y<=0 && velocity<-2){
      alert("Rocket Crashed 💥");
      launched=false;
    }

    if(rocket.position.y>3000){
      scene.background=new THREE.Color(0x000000);
      stars.visible=true;
    }
  }

  let desired=new THREE.Vector3(
    0,
    rocket.position.y+12,
    30
  );
  camera.position.lerp(desired,0.05);
  controls.target.copy(rocket.position);
  controls.update();

  document.getElementById("altitude").innerText=
    "Height: "+rocket.position.y.toFixed(2)+" m";

  renderer.render(scene,camera);
}

animate();
</script>
</body>
</html>

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