/*!
 * OSGKeyboard hero beams — vanilla Three.js recreation inspired by
 * React Bits "Beams" (https://reactbits.dev/backgrounds/beams).
 * Parameters match the shared demo preset.
 * three.js is MIT; this file is project code.
 */
(function (global) {
  "use strict";

  const NOISE = `
float random (in vec2 st) {
  return fract(sin(dot(st.xy, vec2(12.9898,78.233))) * 43758.5453123);
}
float noise (in vec2 st) {
  vec2 i = floor(st);
  vec2 f = fract(st);
  float a = random(i);
  float b = random(i + vec2(1.0, 0.0));
  float c = random(i + vec2(0.0, 1.0));
  float d = random(i + vec2(1.0, 1.0));
  vec2 u = f * f * (3.0 - 2.0 * f);
  return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
}
vec4 permute(vec4 x){return mod(((x*34.0)+1.0)*x, 289.0);}
vec4 taylorInvSqrt(vec4 r){return 1.79284291400159 - 0.85373472095314 * r;}
vec3 fade(vec3 t) {return t*t*t*(t*(t*6.0-15.0)+10.0);}
float cnoise(vec3 P){
  vec3 Pi0 = floor(P);
  vec3 Pi1 = Pi0 + vec3(1.0);
  Pi0 = mod(Pi0, 289.0);
  Pi1 = mod(Pi1, 289.0);
  vec3 Pf0 = fract(P);
  vec3 Pf1 = Pf0 - vec3(1.0);
  vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
  vec4 iy = vec4(Pi0.yy, Pi1.yy);
  vec4 iz0 = Pi0.zzzz;
  vec4 iz1 = Pi1.zzzz;
  vec4 ixy = permute(permute(ix) + iy);
  vec4 ixy0 = permute(ixy + iz0);
  vec4 ixy1 = permute(ixy + iz1);
  vec4 gx0 = ixy0 / 7.0;
  vec4 gy0 = fract(floor(gx0) / 7.0) - 0.5;
  gx0 = fract(gx0);
  vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
  vec4 sz0 = step(gz0, vec4(0.0));
  gx0 -= sz0 * (step(0.0, gx0) - 0.5);
  gy0 -= sz0 * (step(0.0, gy0) - 0.5);
  vec4 gx1 = ixy1 / 7.0;
  vec4 gy1 = fract(floor(gx1) / 7.0) - 0.5;
  gx1 = fract(gx1);
  vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
  vec4 sz1 = step(gz1, vec4(0.0));
  gx1 -= sz1 * (step(0.0, gx1) - 0.5);
  gy1 -= sz1 * (step(0.0, gy1) - 0.5);
  vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
  vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
  vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
  vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
  vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
  vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
  vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
  vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);
  vec4 norm0 = taylorInvSqrt(vec4(dot(g000,g000),dot(g010,g010),dot(g100,g100),dot(g110,g110)));
  g000 *= norm0.x; g010 *= norm0.y; g100 *= norm0.z; g110 *= norm0.w;
  vec4 norm1 = taylorInvSqrt(vec4(dot(g001,g001),dot(g011,g011),dot(g101,g101),dot(g111,g111)));
  g001 *= norm1.x; g011 *= norm1.y; g101 *= norm1.z; g111 *= norm1.w;
  float n000 = dot(g000, Pf0);
  float n100 = dot(g100, vec3(Pf1.x,Pf0.yz));
  float n010 = dot(g010, vec3(Pf0.x,Pf1.y,Pf0.z));
  float n110 = dot(g110, vec3(Pf1.xy,Pf0.z));
  float n001 = dot(g001, vec3(Pf0.xy,Pf1.z));
  float n101 = dot(g101, vec3(Pf1.x,Pf0.y,Pf1.z));
  float n011 = dot(g011, vec3(Pf0.x,Pf1.yz));
  float n111 = dot(g111, Pf1);
  vec3 fade_xyz = fade(Pf0);
  vec4 n_z = mix(vec4(n000,n100,n010,n110),vec4(n001,n101,n011,n111),fade_xyz.z);
  vec2 n_yz = mix(n_z.xy,n_z.zw,fade_xyz.y);
  float n_xyz = mix(n_yz.x,n_yz.y,fade_xyz.x);
  return 2.2 * n_xyz;
}
`;

  function hexToNormalizedRGB(hex) {
    const clean = String(hex).replace("#", "");
    const full = clean.length === 3
      ? clean.split("").map((c) => c + c).join("")
      : clean;
    return [
      parseInt(full.substring(0, 2), 16) / 255,
      parseInt(full.substring(2, 4), 16) / 255,
      parseInt(full.substring(4, 6), 16) / 255
    ];
  }

  function extendMaterial(THREE, BaseMaterial, cfg) {
    const physical = THREE.ShaderLib.physical;
    const { vertexShader: baseVert, fragmentShader: baseFrag, uniforms: baseUniforms } = physical;
    const baseDefines = physical.defines || {};
    const uniforms = THREE.UniformsUtils.clone(baseUniforms);
    const defaults = new BaseMaterial(cfg.material || {});

    if (defaults.color) uniforms.diffuse.value = defaults.color;
    if ("roughness" in defaults) uniforms.roughness.value = defaults.roughness;
    if ("metalness" in defaults) uniforms.metalness.value = defaults.metalness;
    if ("envMap" in defaults) uniforms.envMap.value = defaults.envMap;
    if ("envMapIntensity" in defaults) uniforms.envMapIntensity.value = defaults.envMapIntensity;

    Object.entries(cfg.uniforms || {}).forEach(([key, u]) => {
      uniforms[key] = u !== null && typeof u === "object" && "value" in u ? u : { value: u };
    });

    let vert = `${cfg.header}\n${cfg.vertexHeader || ""}\n${baseVert}`;
    let frag = `${cfg.header}\n${cfg.fragmentHeader || ""}\n${baseFrag}`;
    for (const [inc, code] of Object.entries(cfg.vertex || {})) {
      vert = vert.replace(inc, `${inc}\n${code}`);
    }
    for (const [inc, code] of Object.entries(cfg.fragment || {})) {
      frag = frag.replace(inc, `${inc}\n${code}`);
    }

    return new THREE.ShaderMaterial({
      defines: { ...baseDefines },
      uniforms,
      vertexShader: vert,
      fragmentShader: frag,
      lights: true,
      fog: !!(cfg.material && cfg.material.fog)
    });
  }

  function createStackedPlanesBufferGeometry(THREE, n, width, height, spacing, heightSegments) {
    const geometry = new THREE.BufferGeometry();
    const numVertices = n * (heightSegments + 1) * 2;
    const numFaces = n * heightSegments * 2;
    const positions = new Float32Array(numVertices * 3);
    const indices = new Uint32Array(numFaces * 3);
    const uvs = new Float32Array(numVertices * 2);

    let vertexOffset = 0;
    let indexOffset = 0;
    let uvOffset = 0;
    const totalWidth = n * width + (n - 1) * spacing;
    const xOffsetBase = -totalWidth / 2;

    for (let i = 0; i < n; i++) {
      const xOffset = xOffsetBase + i * (width + spacing);
      const uvXOffset = Math.random() * 300;
      const uvYOffset = Math.random() * 300;

      for (let j = 0; j <= heightSegments; j++) {
        const y = height * (j / heightSegments - 0.5);
        positions.set([xOffset, y, 0, xOffset + width, y, 0], vertexOffset * 3);
        const uvY = j / heightSegments;
        uvs.set([uvXOffset, uvY + uvYOffset, uvXOffset + 1, uvY + uvYOffset], uvOffset);

        if (j < heightSegments) {
          const a = vertexOffset;
          const b = vertexOffset + 1;
          const c = vertexOffset + 2;
          const d = vertexOffset + 3;
          indices.set([a, b, c, c, b, d], indexOffset);
          indexOffset += 6;
        }
        vertexOffset += 2;
        uvOffset += 4;
      }
    }

    geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));
    geometry.setAttribute("uv", new THREE.BufferAttribute(uvs, 2));
    geometry.setIndex(new THREE.BufferAttribute(indices, 1));
    geometry.computeVertexNormals();
    return geometry;
  }

  /**
   * @param {HTMLCanvasElement} canvas
   * @param {object} options
   */
  function create(canvas, options) {
    const THREE = global.THREE;
    if (!THREE || !canvas) throw new Error("THREE or canvas missing");

    const {
      beamWidth = 4.5,
      beamHeight = 6,
      beamNumber = 26,
      lightColor = "#7CFFB2",
      speed = 4.5,
      noiseIntensity = 2.65,
      scale = 0.62,
      rotation = 208,
      background = "#000000",
      reduceMotion = false,
      heightSegments = 100
    } = options || {};

    const scene = new THREE.Scene();
    scene.background = new THREE.Color(background);

    const camera = new THREE.PerspectiveCamera(30, 1, 0.1, 100);
    camera.position.set(0, 0, 20);

    const renderer = new THREE.WebGLRenderer({
      canvas,
      antialias: true,
      alpha: false,
      powerPreference: "low-power"
    });
    renderer.setClearColor(background, 1);
    renderer.outputColorSpace = THREE.SRGBColorSpace;

    const material = extendMaterial(THREE, THREE.MeshStandardMaterial, {
      header: `
  varying vec3 vEye;
  varying float vNoise;
  varying vec2 vUv;
  varying vec3 vPosition;
  uniform float time;
  uniform float uSpeed;
  uniform float uNoiseIntensity;
  uniform float uScale;
  ${NOISE}`,
      vertexHeader: `
  float getPos(vec3 pos) {
    vec3 noisePos =
      vec3(pos.x * 0., pos.y - uv.y, pos.z + time * uSpeed * 3.) * uScale;
    return cnoise(noisePos);
  }
  vec3 getCurrentPos(vec3 pos) {
    vec3 newpos = pos;
    newpos.z += getPos(pos);
    return newpos;
  }
  vec3 getNormal(vec3 pos) {
    vec3 curpos = getCurrentPos(pos);
    vec3 nextposX = getCurrentPos(pos + vec3(0.01, 0.0, 0.0));
    vec3 nextposZ = getCurrentPos(pos + vec3(0.0, -0.01, 0.0));
    vec3 tangentX = normalize(nextposX - curpos);
    vec3 tangentZ = normalize(nextposZ - curpos);
    return normalize(cross(tangentZ, tangentX));
  }`,
      vertex: {
        "#include <begin_vertex>": "transformed.z += getPos(transformed.xyz);",
        "#include <beginnormal_vertex>": "objectNormal = getNormal(position.xyz);"
      },
      fragment: {
        "#include <dithering_fragment>": `
    float randomNoise = noise(gl_FragCoord.xy);
    gl_FragColor.rgb -= randomNoise / 15. * uNoiseIntensity;`
      },
      material: { fog: true },
      uniforms: {
        diffuse: new THREE.Color(...hexToNormalizedRGB("#000000")),
        time: { value: 0 },
        roughness: 0.3,
        metalness: 0.3,
        uSpeed: { value: speed },
        envMapIntensity: 10,
        uNoiseIntensity: { value: noiseIntensity },
        uScale: { value: scale }
      }
    });

    const geometry = createStackedPlanesBufferGeometry(
      THREE,
      beamNumber,
      beamWidth,
      beamHeight,
      0,
      heightSegments
    );
    const mesh = new THREE.Mesh(geometry, material);

    const group = new THREE.Group();
    group.rotation.z = THREE.MathUtils.degToRad(rotation);
    group.add(mesh);

    const dir = new THREE.DirectionalLight(lightColor, 1);
    dir.position.set(0, 3, 10);
    group.add(dir);

    scene.add(group);
    scene.add(new THREE.AmbientLight(0xffffff, 1));

    let playing = !reduceMotion;
    let visible = true;
    let raf = 0;
    let last = performance.now();
    let disposed = false;

    function resize() {
      const parent = canvas.parentElement || canvas;
      const rect = parent.getBoundingClientRect();
      const w = Math.max(1, Math.floor(rect.width));
      const h = Math.max(1, Math.floor(rect.height));
      const dpr = Math.min(window.devicePixelRatio || 1, reduceMotion ? 1 : 1.75);
      renderer.setPixelRatio(dpr);
      renderer.setSize(w, h, false);
      camera.aspect = w / h;
      camera.updateProjectionMatrix();
    }

    function frame(now) {
      if (disposed) return;
      raf = requestAnimationFrame(frame);
      if (!playing || !visible || document.hidden) return;
      const delta = Math.min(0.05, (now - last) / 1000);
      last = now;
      material.uniforms.time.value += 0.1 * delta;
      renderer.render(scene, camera);
    }

    function renderOnce() {
      renderer.render(scene, camera);
    }

    resize();
    // Seed a bit of displacement so the first frame isn't flat
    material.uniforms.time.value = reduceMotion ? 2.4 : 0.2;
    renderOnce();

    if (!reduceMotion) {
      last = performance.now();
      raf = requestAnimationFrame(frame);
    }

    const ro = new ResizeObserver(() => {
      resize();
      renderOnce();
    });
    ro.observe(canvas.parentElement || canvas);

    return {
      setPlaying(next) {
        playing = !!next && !reduceMotion;
        if (playing && !raf) {
          last = performance.now();
          raf = requestAnimationFrame(frame);
        }
      },
      setVisible(next) {
        visible = !!next;
        if (visible && playing && !raf) {
          last = performance.now();
          raf = requestAnimationFrame(frame);
        }
        if (visible) renderOnce();
      },
      setLightColor(hex) {
        dir.color.set(hex);
        renderOnce();
      },
      setBackground(hex) {
        scene.background = new THREE.Color(hex);
        renderer.setClearColor(hex, 1);
        renderOnce();
      },
      resize,
      destroy() {
        disposed = true;
        cancelAnimationFrame(raf);
        raf = 0;
        ro.disconnect();
        geometry.dispose();
        material.dispose();
        renderer.dispose();
      }
    };
  }

  global.OSGBeamsHero = { create };
})(typeof window !== "undefined" ? window : globalThis);