'use client';

import React, { useRef, useState, useEffect, useCallback } from 'react';
import { motion } from 'framer-motion';
import clsx from 'clsx';
import { convertToRgba } from '@/lib/utils';

class Grad {
  x: number;
  y: number;
  z: number;

  constructor(x: number, y: number, z: number) {
    this.x = x;
    this.y = y;
    this.z = z;
  }

  dot2(x: number, y: number) {
    return this.x * x + this.y * y;
  }
}

class Noise {
  grad3: Grad[];
  p: number[];
  perm: number[];
  gradP: Grad[];

  constructor(seed = 0) {
    this.grad3 = [
      new Grad(1, 1, 0),
      new Grad(-1, 1, 0),
      new Grad(1, -1, 0),
      new Grad(-1, -1, 0),
      new Grad(1, 0, 1),
      new Grad(-1, 0, 1),
      new Grad(1, 0, -1),
      new Grad(-1, 0, -1),
      new Grad(0, 1, 1),
      new Grad(0, -1, 1),
      new Grad(0, 1, -1),
      new Grad(0, -1, -1),
    ];
    this.p = [
      151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225,
      140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247,
      120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177,
      33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165,
      71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211,
      133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25,
      63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196,
      135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217,
      226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206,
      59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119, 248,
      152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22,
      39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218,
      246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241,
      81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
      184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93,
      222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180,
    ];
    this.perm = new Array(512);
    this.gradP = new Array(512);
    this.seed(seed);
  }

  seed(seed: number) {
    if (seed > 0 && seed < 1) seed *= 65536;
    seed = Math.floor(seed);
    if (seed < 256) seed |= seed << 8;
    for (let i = 0; i < 256; i++) {
      const v =
        i & 1 ? this.p[i] ^ (seed & 255) : this.p[i] ^ ((seed >> 8) & 255);
      this.perm[i] = this.perm[i + 256] = v;
      this.gradP[i] = this.gradP[i + 256] = this.grad3[v % 12];
    }
  }

  fade(t: number) {
    return t * t * t * (t * (t * 6 - 15) + 10);
  }

  lerp(a: number, b: number, t: number) {
    return (1 - t) * a + t * b;
  }

  perlin2(x: number, y: number) {
    let X = Math.floor(x),
      Y = Math.floor(y);
    x -= X;
    y -= Y;
    X &= 255;
    Y &= 255;
    const n00 = this.gradP[X + this.perm[Y]].dot2(x, y);
    const n01 = this.gradP[X + this.perm[Y + 1]].dot2(x, y - 1);
    const n10 = this.gradP[X + 1 + this.perm[Y]].dot2(x - 1, y);
    const n11 = this.gradP[X + 1 + this.perm[Y + 1]].dot2(x - 1, y - 1);
    const u = this.fade(x);
    return this.lerp(
      this.lerp(n00, n10, u),
      this.lerp(n01, n11, u),
      this.fade(y),
    );
  }
}

// Type definitions for wave points
interface WavePoint {
  x: number;
  y: number;
  wave: { x: number; y: number };
}

interface MovedPoint {
  x: number;
  y: number;
}

export const LandingWavesCtaBg = ({
  className,
  variant = 'default',
  waveSpeedX = 0.0125,
  waveSpeedY = 0.005,
  waveAmpX = 32,
  waveAmpY = 16,
  xGap = 10,
  yGap = 32,
}: {
  className?: string;
  variant?: 'default' | 'primary' | 'secondary';
  waveSpeedX?: number;
  waveSpeedY?: number;
  waveAmpX?: number;
  waveAmpY?: number;
  xGap?: number;
  yGap?: number;
}) => {
  const domRef = useRef<HTMLDivElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const ctxRef = useRef<CanvasRenderingContext2D | null>(null);
  const lineColorRef = useRef<string>('rgba(100, 100, 100, 0.5)');

  const boundingRef = useRef({ width: 0, height: 0, left: 0, top: 0 });
  const noiseRef = useRef(new Noise(Math.random()));
  const linesRef = useRef<Array<Array<WavePoint>>>([]);

  const generateNewColors = useCallback(() => {
    if (!domRef.current) return;

    const computedStyle = getComputedStyle(domRef.current);

    let lineColor;
    switch (variant) {
      case 'primary': {
        const primaryMain = computedStyle
          .getPropertyValue('--primary-main')
          .trim();
        lineColor =
          convertToRgba({ color: primaryMain, opacity: 0.5 }) ||
          'rgba(100, 100, 100, 0.5)';
        break;
      }
      case 'secondary': {
        const secondaryMain = computedStyle
          .getPropertyValue('--secondary-main')
          .trim();
        lineColor =
          convertToRgba({ color: secondaryMain, opacity: 0.5 }) ||
          'rgba(100, 100, 100, 0.5)';
        break;
      }
      default: {
        // For default variant, use a neutral gray color
        lineColor = 'rgba(100, 100, 100, 0.5)';
        break;
      }
    }

    lineColorRef.current = lineColor;
  }, [variant]);

  const cycleDuration = 5 * 1000;

  useEffect(() => {
    // Small delay to ensure DOM is rendered and CSS variables are available
    const timeout = setTimeout(() => {
      generateNewColors();
    }, 100);
    return () => clearTimeout(timeout);
  }, [generateNewColors]);

  useEffect(() => {
    const interval = setInterval(() => {
      generateNewColors();
    }, cycleDuration);
    return () => clearInterval(interval);
  }, [generateNewColors, cycleDuration]);

  useEffect(() => {
    const canvas = canvasRef.current;
    const container = containerRef.current;
    if (!canvas || !container) return;

    generateNewColors();

    ctxRef.current = canvas.getContext('2d');

    function setSize() {
      if (!container || !canvas) return;
      boundingRef.current = container.getBoundingClientRect();
      canvas.width = boundingRef.current.width;
      canvas.height = boundingRef.current.height;
    }

    function setLines() {
      const { width, height } = boundingRef.current;
      linesRef.current = [];
      const oWidth = width + 200,
        oHeight = height + 30;
      const totalLines = Math.ceil(oWidth / xGap);
      const totalPoints = Math.ceil(oHeight / yGap);
      const xStart = (width - xGap * totalLines) / 2;
      const yStart = (height - yGap * totalPoints) / 2;
      for (let i = 0; i <= totalLines; i++) {
        const pts: Array<WavePoint> = [];
        for (let j = 0; j <= totalPoints; j++) {
          pts.push({
            x: xStart + xGap * i,
            y: yStart + yGap * j,
            wave: { x: 0, y: 0 },
          });
        }
        linesRef.current.push(pts);
      }
    }

    function movePoints(time: number) {
      const lines = linesRef.current;
      const noise = noiseRef.current;
      lines.forEach((pts) => {
        pts.forEach((p: WavePoint) => {
          const move =
            noise.perlin2(
              (p.x + time * waveSpeedX) * 0.002,
              (p.y + time * waveSpeedY) * 0.0015,
            ) * 12;
          p.wave.x = Math.cos(move) * waveAmpX;
          p.wave.y = Math.sin(move) * waveAmpY;
        });
      });
    }

    function moved(point: WavePoint): MovedPoint {
      const x = point.x + point.wave.x;
      const y = point.y + point.wave.y;
      return { x: Math.round(x * 10) / 10, y: Math.round(y * 10) / 10 };
    }

    function drawLines() {
      const { width, height } = boundingRef.current;
      const ctx = ctxRef.current;
      if (!ctx) return;

      ctx.clearRect(0, 0, width, height);
      ctx.beginPath();
      ctx.strokeStyle = lineColorRef.current;
      linesRef.current.forEach((points) => {
        let p1 = moved(points[0]);
        ctx.moveTo(p1.x, p1.y);
        points.forEach((p: WavePoint, idx: number) => {
          const isLast = idx === points.length - 1;
          p1 = moved(p);
          const p2 = moved(points[idx + 1] || points[points.length - 1]);
          ctx.lineTo(p1.x, p1.y);
          if (isLast) ctx.moveTo(p2.x, p2.y);
        });
      });
      ctx.stroke();
    }

    function tick(t: number) {
      movePoints(t);
      drawLines();
      requestAnimationFrame(tick);
    }

    function onResize() {
      setSize();
      setLines();
    }

    setSize();
    setLines();
    requestAnimationFrame(tick);

    window.addEventListener('resize', onResize);

    return () => {
      window.removeEventListener('resize', onResize);
    };
  }, [waveSpeedX, waveSpeedY, waveAmpX, waveAmpY, xGap, yGap]);

  return (
    <div ref={domRef} className={clsx('inset-0', className)}>
      <motion.div
        initial={{ opacity: 0 }}
        animate={{ opacity: 1 }}
        transition={{
          duration: 2,
          ease: 'easeInOut',
        }}
        ref={containerRef}
        className="absolute inset-0 w-full h-full overflow-hidden"
        style={{
          backgroundColor: 'transparent',
        }}
      >
        <canvas ref={canvasRef} className="block w-full h-full" />
      </motion.div>
    </div>
  );
};
