import { heroCapture } from './assets/okseong-hero-capture';

const flowPath = (() => {
  let connected = false;
  return heroCapture.terrainFlow.map(point => {
    if (point === null) { connected = false; return ''; }
    const command = connected ? 'L' : 'M'; connected = true;
    return `${command}${point.x} ${point.y}`;
  }).join(' ');
})();
const frame = {
  left: Math.min(...heroCapture.points.map(p=>p.x))-50,
  right: Math.max(...heroCapture.points.map(p=>p.x))+50,
  top: Math.min(...heroCapture.points.map(p=>p.y))-60,
  bottom: Math.max(...heroCapture.points.map(p=>p.y))+70,
};

/** Markers share the exact camera projection used to capture the model. */
export const heroMotionMarkup = (): string => `
  <svg class="landing-model-motion" viewBox="0 0 ${heroCapture.width} ${heroCapture.height}" preserveAspectRatio="xMidYMid meet" aria-hidden="true">
    <defs>
      <filter id="landing-energy-glow" x="-30%" y="-200%" width="160%" height="500%"><feGaussianBlur stdDeviation="3"/></filter>
      <linearGradient id="landing-flow-fade"><stop offset="0" stop-color="#ffffff" stop-opacity="0"/><stop offset=".12" stop-color="#ffffff"/><stop offset=".88" stop-color="#ffffff"/><stop offset="1" stop-color="#ffffff" stop-opacity="0"/></linearGradient>
      <path id="landing-alignment-path" pathLength="1000" d="${flowPath}"/>
    </defs>
    <use href="#landing-alignment-path" class="landing-energy-track"/>
    <use href="#landing-alignment-path" class="landing-energy-haze" filter="url(#landing-energy-glow)"/>
    <use href="#landing-alignment-path" class="landing-energy-flow"/>
    ${heroCapture.points.map(({name,x,y},i)=>`
      <g class="landing-pier-beacon" data-structure="${name}" style="--beacon-delay:${(i*.72+1.6).toFixed(2)}s" transform="translate(${x} ${y})">
        <line x1="0" y1="-31" x2="0" y2="-8"/>
        <circle class="landing-pier-pulse" r="11"/><circle class="landing-pier-point" r="3.5"/>
      </g>`).join('')}
    <path class="landing-hud-bracket" d="M${frame.left} ${frame.top}h-24v22 M${frame.right} ${frame.top}h24v22 M${frame.left} ${frame.bottom}h-24v-22 M${frame.right} ${frame.bottom}h24v-22"/>
  </svg>`;

export function createHeroMotion(root: HTMLElement): void {
  const hero = root.querySelector<HTMLElement>('.landing-hero');
  if (!hero) return;
  const reduced = matchMedia('(prefers-reduced-motion: reduce)');
  const finePointer = matchMedia('(hover: hover) and (pointer: fine)');
  let frame = 0;
  let currentX = 0;
  let currentY = 0;
  let targetX = 0;
  let targetY = 0;
  const update = (): void => {
    currentX += (targetX-currentX)*.075;
    currentY += (targetY-currentY)*.075;
    hero.style.setProperty('--landing-parallax-x', `${currentX.toFixed(2)}px`);
    hero.style.setProperty('--landing-parallax-y', `${currentY.toFixed(2)}px`);
    frame = Math.abs(targetX-currentX)+Math.abs(targetY-currentY)>.08 ? requestAnimationFrame(update) : 0;
  };
  const reset = (): void => {
    targetX = targetY = currentX = currentY = 0;
    cancelAnimationFrame(frame);frame=0;
    hero.style.setProperty('--landing-parallax-x','0px');hero.style.setProperty('--landing-parallax-y','0px');
  };
  hero.addEventListener('pointermove', (event) => {
    if (reduced.matches || !finePointer.matches || root.hidden || root.classList.contains('guide-open')) return;
    const bounds=hero.getBoundingClientRect();
    targetX=((event.clientX-bounds.left)/bounds.width-.5)*18;
    targetY=((event.clientY-bounds.top)/bounds.height-.5)*12;
    if (!frame) frame=requestAnimationFrame(update);
  },{passive:true});
  hero.addEventListener('pointerleave',reset,{passive:true});
  reduced.addEventListener('change',()=>{if(reduced.matches)reset();});
  document.addEventListener('visibilitychange',()=>{root.classList.toggle('landing-paused',document.hidden);if(document.hidden)reset();});
  // Native import dialogs are outside the overlay. Pause all ambient work while
  // an upload/guide panel is active or when the main application is showing.
  const synchronize = (): void => {
    const blocked=!!root.hidden||!!document.querySelector('#import-dialog[open]')||!!root.querySelector('.landing-panel.visible')||root.classList.contains('guide-open');
    if (root.classList.contains('landing-inactive')!==blocked) root.classList.toggle('landing-inactive',blocked);
    if (blocked)reset();
  };
  const observer=new MutationObserver(synchronize);
  observer.observe(root,{attributes:true,subtree:true,attributeFilter:['hidden','class']});
  const importDialog=document.querySelector('#import-dialog');
  if(importDialog)observer.observe(importDialog,{attributes:true,attributeFilter:['open']});
  synchronize();
}