import { useEffect, useRef, useState } from "react"
import type { CSSProperties, HTMLAttributes } from "react"

import { cn } from "@/lib/utils"

const ANIMATION_DURATION_SECONDS = 15
const GRID_HEIGHT_RATIO = 3
const GRID_LINE_ALIGNMENT_OFFSET_PX = 0.5
const GRID_LINE_ANTIALIAS_MULTIPLIER = 0.9
const GRID_LINE_WIDTH_PX = 0.92
const GRID_START_OFFSET_RATIO = -0.5
const GRID_WIDTH_RATIO = 6
const GRID_X_OFFSET_RATIO = -2
const MAX_ANGLE = 89
const MAX_DEVICE_PIXEL_RATIO = 2
const MIN_ANGLE = 1
const PERSPECTIVE_PX = 200
const FALLBACK_ANIMATION_NAME = "retro-grid-fallback-scroll"
const FALLBACK_STYLES = `
@keyframes ${FALLBACK_ANIMATION_NAME} {
  from {
    transform: translateY(-50%);
  }

  to {
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  [data-retro-grid-scroll="true"] {
    animation: none !important;
    transform: translateY(-50%) !important;
  }
}
`

const VERTEX_SHADER_SOURCE = `
attribute vec2 a_position;

void main() {
  gl_Position = vec4(a_position, 0.0, 1.0);
}
`

const FRAGMENT_SHADER_SOURCE = `
#extension GL_OES_standard_derivatives : enable
precision highp float;

uniform vec2 u_container_size;
uniform vec2 u_viewport_size;
uniform vec4 u_line_color;
uniform float u_angle;
uniform float u_cell_size;
uniform float u_device_pixel_ratio;
uniform float u_time;

const float animationDurationSeconds = ${ANIMATION_DURATION_SECONDS.toFixed(1)};
const float gridHeightRatio = ${GRID_HEIGHT_RATIO.toFixed(1)};
const float gridStartOffsetRatio = ${GRID_START_OFFSET_RATIO.toFixed(1)};
const float gridWidthRatio = ${GRID_WIDTH_RATIO.toFixed(1)};
const float gridXOffsetRatio = ${GRID_X_OFFSET_RATIO.toFixed(1)};
const float gridLineAlignmentOffsetPx = ${GRID_LINE_ALIGNMENT_OFFSET_PX.toFixed(1)};
const float gridLineAntialiasMultiplier = ${GRID_LINE_ANTIALIAS_MULTIPLIER.toFixed(1)};
const float horizontalLodLevelOneEndPx = 5.6;
const float horizontalLodLevelOneStartPx = 2.8;
const float horizontalLodLevelTwoEndPx = 3.0;
const float horizontalLodLevelTwoStartPx = 1.4;
const float horizontalCompressionEndPx = 2.8;
const float horizontalCompressionStartPx = 1.2;
const float lineWidthPx = ${GRID_LINE_WIDTH_PX.toFixed(2)};
const float perspectivePx = ${PERSPECTIVE_PX.toFixed(1)};
const float gridTravelRatio = 0.5;
const float verticalCompressionEndPx = 2.6;
const float verticalCompressionStartPx = 1.0;
const float verticalEdgeCompressionEnd = 0.95;
const float verticalEdgeCompressionStart = 0.45;
const float verticalLodLevelEnd = 0.64;
const float verticalLodLevelStart = 0.22;
const float verticalTopCompressionEndCells = 6.0;
const float verticalTopCompressionStartCells = 2.0;

float renderGridLine(
  float wrappedCoord,
  float antiAliasWidth,
  float softnessBoost
) {
  return 1.0 - smoothstep(
    lineWidthPx,
    lineWidthPx + (antiAliasWidth * (1.5 + softnessBoost)),
    wrappedCoord
  );
}

void main() {
  float angle = radians(clamp(u_angle, 1.0, 89.0));
  float sinAngle = sin(angle);
  float cosAngle = cos(angle);
  vec2 screen = vec2(
    (gl_FragCoord.x / u_device_pixel_ratio) - (u_container_size.x * 0.5),
    (u_container_size.y * 0.5) - (gl_FragCoord.y / u_device_pixel_ratio)
  );

  vec3 rayOrigin = vec3(0.0, 0.0, perspectivePx);
  vec3 rayDirection = normalize(vec3(screen, -perspectivePx));
  vec3 planeXAxis = vec3(1.0, 0.0, 0.0);
  vec3 planeYAxis = vec3(0.0, cosAngle, sinAngle);
  vec3 planeNormal = normalize(cross(planeXAxis, planeYAxis));
  float denominator = dot(rayDirection, planeNormal);

  if (abs(denominator) < 0.0001) {
    discard;
  }

  float distanceToPlane = dot(-rayOrigin, planeNormal) / denominator;

  if (distanceToPlane <= 0.0) {
    discard;
  }

  vec3 hitPoint = rayOrigin + (rayDirection * distanceToPlane);
  float localX = hitPoint.x;
  float localY = dot(hitPoint, planeYAxis);
  float gridWidth = u_viewport_size.x * gridWidthRatio;
  float gridHeight = u_viewport_size.y * gridHeightRatio;
  float gridScrollSpeed = (gridHeight * gridTravelRatio) / animationDurationSeconds;
  float patternOffsetY = u_time * gridScrollSpeed;
  float gridLeft = (-0.5 * u_container_size.x) + (gridXOffsetRatio * u_container_size.x);
  float gridTop = (-0.5 * u_container_size.y) + (gridStartOffsetRatio * gridHeight);
  vec2 planePosition = vec2(localX - gridLeft, localY - gridTop);

  if (
    planePosition.x < 0.0 ||
    planePosition.y < 0.0 ||
    planePosition.x > gridWidth ||
    planePosition.y > gridHeight
  ) {
    discard;
  }

  vec2 patternPosition = vec2(planePosition.x, planePosition.y - patternOffsetY);
  vec2 wrapped = mod(
    patternPosition + vec2(gridLineAlignmentOffsetPx),
    u_cell_size
  );
  vec2 patternDerivative = max(fwidth(patternPosition), vec2(0.0001));
  vec2 antiAliasWidth = patternDerivative * gridLineAntialiasMultiplier;
  float horizontalCellSpanPx = u_cell_size / patternDerivative.y;
  float horizontalCompression = 1.0 - smoothstep(
    horizontalCompressionStartPx,
    horizontalCompressionEndPx,
    horizontalCellSpanPx
  );
  float verticalCellSpanPx = u_cell_size / patternDerivative.x;
  float sideDistance = abs((planePosition.x / gridWidth) * 2.0 - 1.0);
  float verticalEdgeCompression = smoothstep(
    verticalEdgeCompressionStart,
    verticalEdgeCompressionEnd,
    sideDistance
  );
  float verticalTopCompression = 1.0 - smoothstep(
    u_cell_size * verticalTopCompressionStartCells,
    u_cell_size * verticalTopCompressionEndCells,
    planePosition.y
  );
  float verticalCompression =
    (1.0 - smoothstep(
      verticalCompressionStartPx,
      verticalCompressionEndPx,
      verticalCellSpanPx
    )) * verticalEdgeCompression * verticalTopCompression;
  float horizontalSoftnessBoost = 1.0 + (horizontalCompression * 3.0);
  float verticalSoftnessBoost = 1.0 + (verticalCompression * 3.5);
  float verticalLod = smoothstep(
    verticalLodLevelStart,
    verticalLodLevelEnd,
    verticalCompression
  );
  float verticalLineFine = renderGridLine(
    wrapped.x,
    antiAliasWidth.x,
    verticalSoftnessBoost
  );
  float verticalWrappedLod = mod(
    patternPosition.x + gridLineAlignmentOffsetPx,
    u_cell_size * 2.0
  );
  float verticalLineCoarse = renderGridLine(
    verticalWrappedLod,
    antiAliasWidth.x,
    verticalSoftnessBoost + verticalLod
  );
  float verticalLine = max(
    verticalLineFine * (1.0 - verticalLod),
    verticalLineCoarse * verticalLod
  );
  float horizontalLodLevelOne = 1.0 - smoothstep(
    horizontalLodLevelOneStartPx,
    horizontalLodLevelOneEndPx,
    horizontalCellSpanPx
  );
  float horizontalLodLevelTwo = 1.0 - smoothstep(
    horizontalLodLevelTwoStartPx,
    horizontalLodLevelTwoEndPx,
    horizontalCellSpanPx
  );
  float horizontalLineFine = renderGridLine(
    wrapped.y,
    antiAliasWidth.y,
    horizontalSoftnessBoost
  );
  float horizontalWrappedLodOne = mod(
    patternPosition.y + gridLineAlignmentOffsetPx,
    u_cell_size * 2.0
  );
  float horizontalWrappedLodTwo = mod(
    patternPosition.y + gridLineAlignmentOffsetPx,
    u_cell_size * 4.0
  );
  float horizontalLineCoarse = renderGridLine(
    horizontalWrappedLodOne,
    antiAliasWidth.y,
    horizontalSoftnessBoost + horizontalLodLevelOne
  );
  float horizontalLineExtraCoarse = renderGridLine(
    horizontalWrappedLodTwo,
    antiAliasWidth.y,
    horizontalSoftnessBoost + horizontalLodLevelOne + horizontalLodLevelTwo
  );
  float horizontalLineReduced = max(
    horizontalLineFine * (1.0 - horizontalLodLevelOne),
    horizontalLineCoarse * horizontalLodLevelOne
  );
  float horizontalLine = max(
    horizontalLineReduced * (1.0 - horizontalLodLevelTwo),
    horizontalLineExtraCoarse * horizontalLodLevelTwo
  );
  float line = max(verticalLine, horizontalLine);

  if (line <= 0.001) {
    discard;
  }

  float alpha = u_line_color.a * line;
  gl_FragColor = vec4(u_line_color.rgb * alpha, alpha);
}
`

interface RetroGridProps extends HTMLAttributes<HTMLDivElement> {
  /**
   * Additional CSS classes to apply to the grid container
   */
  className?: string
  /**
   * Rotation angle of the grid in degrees
   * @default 65
   */
  angle?: number
  /**
   * Grid cell size in pixels
   * @default 60
   */
  cellSize?: number
  /**
   * Grid opacity value between 0 and 1
   * @default 0.5
   */
  opacity?: number
  /**
   * Grid line color in light mode
   * @default "gray"
   */
  lightLineColor?: string
  /**
   * Grid line color in dark mode
   * @default "gray"
   */
  darkLineColor?: string
}

interface ProgramInfo {
  attributeLocation: number
  program: WebGLProgram
  uniforms: {
    angle: WebGLUniformLocation
    cellSize: WebGLUniformLocation
    containerSize: WebGLUniformLocation
    devicePixelRatio: WebGLUniformLocation
    lineColor: WebGLUniformLocation
    time: WebGLUniformLocation
    viewportSize: WebGLUniformLocation
  }
}

let colorResolveContext: CanvasRenderingContext2D | null | undefined

function clamp(value: number, min: number, max: number) {
  return Math.min(Math.max(value, min), max)
}

function createShader(gl: WebGLRenderingContext, type: number, source: string) {
  const shader = gl.createShader(type)

  if (!shader) {
    return null
  }

  gl.shaderSource(shader, source)
  gl.compileShader(shader)

  if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    return shader
  }

  gl.deleteShader(shader)
  return null
}

function createProgram(gl: WebGLRenderingContext) {
  const vertexShader = createShader(gl, gl.VERTEX_SHADER, VERTEX_SHADER_SOURCE)
  const fragmentShader = createShader(
    gl,
    gl.FRAGMENT_SHADER,
    FRAGMENT_SHADER_SOURCE
  )

  if (!vertexShader || !fragmentShader) {
    return null
  }

  const program = gl.createProgram()

  if (!program) {
    gl.deleteShader(vertexShader)
    gl.deleteShader(fragmentShader)
    return null
  }

  gl.attachShader(program, vertexShader)
  gl.attachShader(program, fragmentShader)
  gl.linkProgram(program)
  gl.deleteShader(vertexShader)
  gl.deleteShader(fragmentShader)

  if (gl.getProgramParameter(program, gl.LINK_STATUS)) {
    return program
  }

  gl.deleteProgram(program)
  return null
}

function getProgramInfo(
  gl: WebGLRenderingContext,
  program: WebGLProgram
): ProgramInfo | null {
  const attributeLocation = gl.getAttribLocation(program, "a_position")
  const angle = gl.getUniformLocation(program, "u_angle")
  const cellSize = gl.getUniformLocation(program, "u_cell_size")
  const containerSize = gl.getUniformLocation(program, "u_container_size")
  const devicePixelRatio = gl.getUniformLocation(
    program,
    "u_device_pixel_ratio"
  )
  const lineColor = gl.getUniformLocation(program, "u_line_color")
  const time = gl.getUniformLocation(program, "u_time")
  const viewportSize = gl.getUniformLocation(program, "u_viewport_size")

  if (
    attributeLocation < 0 ||
    !angle ||
    !cellSize ||
    !containerSize ||
    !devicePixelRatio ||
    !lineColor ||
    !time ||
    !viewportSize
  ) {
    return null
  }

  return {
    attributeLocation,
    program,
    uniforms: {
      angle,
      cellSize,
      containerSize,
      devicePixelRatio,
      lineColor,
      time,
      viewportSize,
    },
  }
}

function isDarkMode(colorScheme: MediaQueryList) {
  const root = document.documentElement

  if (root.classList.contains("dark")) {
    return true
  }

  if (root.classList.contains("light")) {
    return false
  }

  return colorScheme.matches
}

function getColorResolveContext() {
  if (colorResolveContext !== undefined) {
    return colorResolveContext
  }

  const canvas = document.createElement("canvas")
  canvas.width = 1
  canvas.height = 1
  colorResolveContext = canvas.getContext("2d", {
    willReadFrequently: true,
  })

  return colorResolveContext
}

function resolveLineColor(color: string, element: HTMLElement) {
  const resolver = document.createElement("span")
  resolver.style.color = color
  resolver.style.opacity = "0"
  resolver.style.pointerEvents = "none"
  resolver.style.position = "absolute"
  element.appendChild(resolver)

  const resolvedColor = getComputedStyle(resolver).color
  resolver.remove()
  const context = getColorResolveContext()

  if (!context) {
    return new Float32Array([0.5, 0.5, 0.5, 1])
  }

  context.clearRect(0, 0, 1, 1)
  context.fillStyle = resolvedColor
  context.fillRect(0, 0, 1, 1)
  const pixel = context.getImageData(0, 0, 1, 1).data

  return new Float32Array([
    pixel[0] / 255,
    pixel[1] / 255,
    pixel[2] / 255,
    pixel[3] / 255,
  ])
}

function createFallbackGridStyle(
  cellSize: number,
  lineColor: string
): CSSProperties {
  return {
    animation: `${FALLBACK_ANIMATION_NAME} ${ANIMATION_DURATION_SECONDS}s linear infinite`,
    backgroundImage: `linear-gradient(to right, ${lineColor} 1px, transparent 0), linear-gradient(to bottom, ${lineColor} 1px, transparent 0)`,
    backgroundRepeat: "repeat",
    backgroundSize: `${cellSize}px ${cellSize}px`,
    transform: "translateY(-50%)",
  }
}

export function RetroGrid({
  className,
  angle = 65,
  cellSize = 60,
  opacity = 0.5,
  lightLineColor = "gray",
  darkLineColor = "gray",
  style,
  ...props
}: RetroGridProps) {
  const canvasRef = useRef<HTMLCanvasElement>(null)
  const containerRef = useRef<HTMLDivElement>(null)
  const [isWebGlReady, setIsWebGlReady] = useState(false)
  const angleRef = useRef(angle)
  const cellSizeRef = useRef(cellSize)
  const darkLineColorRef = useRef(darkLineColor)
  const lightLineColorRef = useRef(lightLineColor)
  const syncSceneRef = useRef<(() => void) | null>(null)

  useEffect(() => {
    angleRef.current = angle
    cellSizeRef.current = cellSize
    darkLineColorRef.current = darkLineColor
    lightLineColorRef.current = lightLineColor
    syncSceneRef.current?.()
  }, [angle, cellSize, darkLineColor, lightLineColor])

  useEffect(() => {
    const canvas = canvasRef.current
    const container = containerRef.current

    if (!canvas || !container) {
      return
    }

    const reducedMotion = window.matchMedia("(prefers-reduced-motion: reduce)")
    const colorScheme = window.matchMedia("(prefers-color-scheme: dark)")

    let animationFrameId: number | null = null
    let currentWidth = 0
    let currentHeight = 0
    let currentDevicePixelRatio = 1
    let gl: WebGLRenderingContext | null = null
    let isVisible = true
    let isContextLost = false
    let lineColor = resolveLineColor(lightLineColorRef.current, container)
    let positionBuffer: WebGLBuffer | null = null
    let programInfo: ProgramInfo | null = null

    const getContext = () => {
      const nextGl = canvas.getContext("webgl", {
        alpha: true,
        antialias: true,
        premultipliedAlpha: true,
      })

      if (!nextGl || !nextGl.getExtension("OES_standard_derivatives")) {
        return null
      }

      return nextGl
    }

    const releasePipeline = (shouldDeleteResources: boolean) => {
      if (shouldDeleteResources && gl) {
        if (positionBuffer) {
          gl.deleteBuffer(positionBuffer)
        }

        if (programInfo) {
          gl.deleteProgram(programInfo.program)
        }
      }

      positionBuffer = null
      programInfo = null

      if (shouldDeleteResources) {
        gl = null
      }
    }

    const initializePipeline = () => {
      const nextGl = getContext()

      if (!nextGl) {
        releasePipeline(false)
        return false
      }

      gl = nextGl
      releasePipeline(true)
      gl = nextGl

      const program = createProgram(nextGl)

      if (!program) {
        return false
      }

      const nextProgramInfo = getProgramInfo(nextGl, program)

      if (!nextProgramInfo) {
        nextGl.deleteProgram(program)
        return false
      }

      const nextPositionBuffer = nextGl.createBuffer()

      if (!nextPositionBuffer) {
        nextGl.deleteProgram(program)
        return false
      }

      nextGl.bindBuffer(nextGl.ARRAY_BUFFER, nextPositionBuffer)
      nextGl.bufferData(
        nextGl.ARRAY_BUFFER,
        new Float32Array([-1, -1, 3, -1, -1, 3]),
        nextGl.STATIC_DRAW
      )

      positionBuffer = nextPositionBuffer
      programInfo = nextProgramInfo

      return true
    }

    const updateLineColor = () => {
      const activeColor = isDarkMode(colorScheme)
        ? darkLineColorRef.current
        : lightLineColorRef.current
      lineColor = resolveLineColor(activeColor, container)
    }

    const resizeCanvas = () => {
      currentWidth = Math.floor(container.clientWidth)
      currentHeight = Math.floor(container.clientHeight)

      if (currentWidth === 0 || currentHeight === 0 || !gl) {
        return
      }

      currentDevicePixelRatio = Math.min(
        window.devicePixelRatio || 1,
        MAX_DEVICE_PIXEL_RATIO
      )

      canvas.width = Math.floor(currentWidth * currentDevicePixelRatio)
      canvas.height = Math.floor(currentHeight * currentDevicePixelRatio)
      canvas.style.width = `${currentWidth}px`
      canvas.style.height = `${currentHeight}px`
      gl.viewport(0, 0, canvas.width, canvas.height)
    }

    const draw = (timestamp: number) => {
      if (
        currentWidth === 0 ||
        currentHeight === 0 ||
        !gl ||
        !positionBuffer ||
        !programInfo ||
        isContextLost
      ) {
        return
      }

      gl.useProgram(programInfo.program)
      gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer)
      gl.enableVertexAttribArray(programInfo.attributeLocation)
      gl.vertexAttribPointer(
        programInfo.attributeLocation,
        2,
        gl.FLOAT,
        false,
        0,
        0
      )
      gl.clearColor(0, 0, 0, 0)
      gl.clear(gl.COLOR_BUFFER_BIT)
      gl.uniform1f(
        programInfo.uniforms.angle,
        clamp(angleRef.current, MIN_ANGLE, MAX_ANGLE)
      )
      gl.uniform1f(
        programInfo.uniforms.cellSize,
        Math.max(cellSizeRef.current, 1)
      )
      gl.uniform2f(
        programInfo.uniforms.containerSize,
        currentWidth,
        currentHeight
      )
      gl.uniform1f(
        programInfo.uniforms.devicePixelRatio,
        currentDevicePixelRatio
      )
      gl.uniform4fv(programInfo.uniforms.lineColor, lineColor)
      gl.uniform1f(
        programInfo.uniforms.time,
        reducedMotion.matches ? 0 : timestamp / 1000
      )
      gl.uniform2f(
        programInfo.uniforms.viewportSize,
        window.innerWidth,
        window.innerHeight
      )
      gl.drawArrays(gl.TRIANGLES, 0, 3)
    }

    const stopAnimation = () => {
      if (animationFrameId !== null) {
        cancelAnimationFrame(animationFrameId)
        animationFrameId = null
      }
    }

    const frame = (timestamp: number) => {
      draw(timestamp)

      if (!reducedMotion.matches && isVisible) {
        animationFrameId = requestAnimationFrame(frame)
        return
      }

      animationFrameId = null
    }

    const syncScene = () => {
      if (isContextLost) {
        stopAnimation()
        setIsWebGlReady(false)
        return
      }

      if (!gl || !positionBuffer || !programInfo) {
        if (!initializePipeline()) {
          stopAnimation()
          setIsWebGlReady(false)
          return
        }
      }

      resizeCanvas()

      if (currentWidth === 0 || currentHeight === 0) {
        stopAnimation()
        return
      }

      updateLineColor()
      draw(performance.now())
      setIsWebGlReady(true)

      if (reducedMotion.matches || !isVisible) {
        stopAnimation()
        return
      }

      if (animationFrameId === null) {
        animationFrameId = requestAnimationFrame(frame)
      }
    }

    syncSceneRef.current = syncScene

    const resizeObserver = new ResizeObserver(() => {
      syncScene()
    })
    resizeObserver.observe(container)

    const handleWindowResize = () => {
      syncScene()
    }

    const intersectionObserver = new IntersectionObserver(([entry]) => {
      isVisible = entry?.isIntersecting ?? false

      if (isVisible) {
        syncScene()
        return
      }

      stopAnimation()
    })
    intersectionObserver.observe(container)

    const themeObserver = new MutationObserver(() => {
      syncScene()
    })
    themeObserver.observe(document.documentElement, {
      attributeFilter: ["class"],
      attributes: true,
    })

    const handleMotionChange = () => {
      syncScene()
    }

    const handleColorSchemeChange = () => {
      syncScene()
    }

    const handleContextLost = (event: Event) => {
      event.preventDefault()
      isContextLost = true
      stopAnimation()
      releasePipeline(false)
      setIsWebGlReady(false)
    }

    const handleContextRestored = () => {
      isContextLost = false
      syncScene()
    }

    reducedMotion.addEventListener("change", handleMotionChange)
    colorScheme.addEventListener("change", handleColorSchemeChange)
    window.addEventListener("resize", handleWindowResize)
    canvas.addEventListener("webglcontextlost", handleContextLost)
    canvas.addEventListener("webglcontextrestored", handleContextRestored)

    syncScene()

    return () => {
      stopAnimation()
      resizeObserver.disconnect()
      intersectionObserver.disconnect()
      themeObserver.disconnect()
      reducedMotion.removeEventListener("change", handleMotionChange)
      colorScheme.removeEventListener("change", handleColorSchemeChange)
      window.removeEventListener("resize", handleWindowResize)
      canvas.removeEventListener("webglcontextlost", handleContextLost)
      canvas.removeEventListener("webglcontextrestored", handleContextRestored)
      syncSceneRef.current = null
      releasePipeline(!isContextLost)
    }
  }, [])

  const gridStyles = {
    ...style,
    opacity,
  } as CSSProperties
  const normalizedAngle = clamp(angle, MIN_ANGLE, MAX_ANGLE)
  const normalizedCellSize = Math.max(cellSize, 1)
  const fallbackProjectionStyles = {
    perspective: `${PERSPECTIVE_PX}px`,
  } as CSSProperties
  const fallbackRotationStyles = {
    transform: `rotateX(${normalizedAngle}deg)`,
  } as CSSProperties
  const lightFallbackGridStyles = createFallbackGridStyle(
    normalizedCellSize,
    lightLineColor
  )
  const darkFallbackGridStyles = createFallbackGridStyle(
    normalizedCellSize,
    darkLineColor
  )

  return (
    <div
      ref={containerRef}
      className={cn(
        "pointer-events-none absolute size-full overflow-hidden",
        className
      )}
      style={gridStyles}
      {...props}
    >
      <style>{FALLBACK_STYLES}</style>
      {!isWebGlReady ? (
        <div className="absolute inset-0" style={fallbackProjectionStyles}>
          <div className="absolute inset-0" style={fallbackRotationStyles}>
            <div
              data-retro-grid-scroll="true"
              className="absolute inset-[0%_0px] ml-[-200%] h-[300vh] w-[600vw] origin-[100%_0_0] dark:hidden"
              style={lightFallbackGridStyles}
            />
            <div
              data-retro-grid-scroll="true"
              className="absolute inset-[0%_0px] ml-[-200%] hidden h-[300vh] w-[600vw] origin-[100%_0_0] dark:block"
              style={darkFallbackGridStyles}
            />
          </div>
        </div>
      ) : null}
      <canvas
        ref={canvasRef}
        className={cn(
          "absolute inset-0 size-full",
          isWebGlReady ? "opacity-100" : "opacity-0"
        )}
      />
      <div className="absolute inset-0 bg-linear-to-t from-white to-transparent to-90% dark:from-black" />
    </div>
  )
}
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