/* Deterministic presets available before the Python runtime has loaded. */
(function(root){
  function create(type){
    const points=[];
    const add=(x,y,label)=>points.push({x,y,label});
    if(type==='xor') return [
      {x:0.1,y:0.9,label:-1},{x:0.9,y:0.1,label:-1},
      {x:0.1,y:0.1,label:1},{x:0.9,y:0.9,label:1},
    ];
    if(type==='two_moons') for(let i=0;i<36;i++){
      const t=i/35*Math.PI;
      add(.36+.28*Math.cos(t),.49+.28*Math.sin(t),-1);
      add(.64+.28*Math.cos(t),.51-.28*Math.sin(t),1);
    }
    if(type==='circles') for(let i=0;i<60;i++){
      const t=i/60*2*Math.PI;
      for(const [r,label] of [[.18,-1],[.38,1]]) add(.5+r*Math.cos(t),.5+r*Math.sin(t),label);
    }
    if(type==='blobs'){
      // Fixed Gaussian samples keep the same dataset on every selection.
      let seed=42;
      const random=()=>{seed=(Math.imul(1664525,seed)+1013904223)>>>0;return (seed+.5)/4294967296;};
      for(const [cx,cy,label] of [[.25,.3,-1],[.75,.3,1],[.5,.75,2]]) for(let i=0;i<40;i++){
        const r=.065*Math.sqrt(-2*Math.log(random())),t=2*Math.PI*random();
        add(Math.max(.02,Math.min(.98,cx+r*Math.cos(t))),Math.max(.02,Math.min(.98,cy+r*Math.sin(t))),label);
      }
    }
    if(type==='spirals') for(let i=0;i<70;i++){
      const r=.04+.4*i/69,t=i/69*2*Math.PI;
      add(.5+r*Math.cos(t),.5+r*Math.sin(t),-1);
      add(.5-r*Math.cos(t),.5-r*Math.sin(t),1);
    }
    return points;
  }
  const api={create};
  if(typeof module!=='undefined')module.exports=api;else root.Datasets=api;
})(globalThis);