import React, { useEffect, useRef, useState, useCallback } from 'react';
import './CybersecMenu.css';

interface Notification {
  id: number;
  title: string;
  message: string;
  removing: boolean;
}

const CybersecMenu: React.FC = () => {
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const animFrameRef = useRef<number>(0);
  const smokeOffsetRef = useRef(0);
  const titleRef = useRef<HTMLHeadingElement>(null);
  const [notification, setNotification] = useState<Notification | null>(null);
  const notifIdRef = useRef(0);
  const notifTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);

  const showNotification = useCallback((title: string, message: string) => {
    if (notifTimerRef.current) clearTimeout(notifTimerRef.current);
    const id = ++notifIdRef.current;
    setNotification({ id, title, message, removing: false });
    notifTimerRef.current = setTimeout(() => {
      setNotification(prev => prev?.id === id ? { ...prev, removing: true } : prev);
      setTimeout(() => setNotification(prev => prev?.id === id ? null : prev), 300);
    }, 3000);
  }, []);

  const selectLevel = useCallback((level: number | string) => {
    const levelNames: Record<string | number, string> = {
      1: 'Phishing – Fake emails & links',
      2: 'Skimming – ATM/card fraud',
      3: 'Password cracking – Brute force & dictionary',
      4: 'Social engineering – Manipulation',
      'deepfake': 'Voice deepfake – AI-generated speech',
    };
    showNotification(`>> LEVEL ${level} SELECTED`, levelNames[level]);
  }, [showNotification]);

  const openWiki = useCallback(() => {
    showNotification('>> ACCESSING WIKI', 'Security knowledge base loading...');
  }, [showNotification]);

  const openQuiz = useCallback(() => {
    showNotification('>> INITIATING QUIZ', 'Test your skills module loading...');
	
  }, [showNotification]);

  // Keyboard navigation
  useEffect(() => {
    const handleKey = (e: KeyboardEvent) => {
      const map: Record<string, () => void> = {
        '1': () => selectLevel(1),
        '2': () => selectLevel(2),
        '3': () => selectLevel(3),
        '4': () => selectLevel(4),
        '5': () => selectLevel('deepfake'),
        'w': openWiki, 'W': openWiki,
        'q': openQuiz, 'Q': openQuiz,
      };
      map[e.key]?.();
    };
    window.addEventListener('keydown', handleKey);
    return () => window.removeEventListener('keydown', handleKey);
  }, [selectLevel, openWiki, openQuiz]);

  // Glitch effect on title
  useEffect(() => {
    const interval = setInterval(() => {
      if (Math.random() > 0.9 && titleRef.current) {
        const rx = (Math.random() * 10 - 5).toFixed(1);
        const rx2 = (Math.random() * 10 - 5).toFixed(1);
        titleRef.current.style.textShadow = `${rx}px 0 #FF0040, ${rx2}px 0 #00FFFF`;
        setTimeout(() => {
          if (titleRef.current) titleRef.current.style.textShadow = '0 0 30px rgba(0,255,255,0.5)';
        }, 100);
      }
    }, 2000);
    return () => clearInterval(interval);
  }, []);

  // Particle canvas
  useEffect(() => {
    const canvas = canvasRef.current;
    if (!canvas) return;
    const ctx = canvas.getContext('2d');
    if (!ctx) return;

    const resize = () => {
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
    };
    resize();

    const COLORS = ['#00FF41', '#FF00FF', '#00FFFF', '#FF6600'];

    class Particle {
      x = 0; y = 0; size = 0; speedX = 0; speedY = 0;
      opacity = 0; color = ''; life = 0; maxLife = 0;
      constructor() { this.reset(); }
      reset() {
        this.x = Math.random() * canvas.width;
        this.y = Math.random() * canvas.height;
        this.size = Math.random() * 3 + 1;
        this.speedX = (Math.random() - 0.5) * 0.5;
        this.speedY = (Math.random() - 0.5) * 0.5;
        this.opacity = Math.random() * 0.5 + 0.1;
        this.color = COLORS[Math.floor(Math.random() * COLORS.length)];
        this.life = 0;
        this.maxLife = Math.random() * 200 + 100;
      }
      update() {
        this.x += this.speedX;
        this.y += this.speedY;
        this.life++;
        if (this.x < 0) this.x = canvas.width;
        if (this.x > canvas.width) this.x = 0;
        if (this.y < 0) this.y = canvas.height;
        if (this.y > canvas.height) this.y = 0;
        if (this.life > this.maxLife) this.reset();
      }
      draw() {
        ctx.save();
        ctx.globalAlpha = this.opacity * (1 - this.life / this.maxLife);
        ctx.fillStyle = this.color;
        ctx.shadowBlur = 10;
        ctx.shadowColor = this.color;
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
        ctx.fill();
        ctx.restore();
      }
    }

    const count = Math.min(80, Math.floor((canvas.width * canvas.height) / 15000));
    let particles = Array.from({ length: count }, () => new Particle());

    const onVis = () => {
      if (document.hidden) { cancelAnimationFrame(animFrameRef.current); }
      else { animate(); }
    };
    document.addEventListener('visibilitychange', onVis);

    const onResize = () => { resize(); particles = Array.from({ length: Math.min(80, Math.floor((canvas.width * canvas.height) / 15000)) }, () => new Particle()); };
    window.addEventListener('resize', onResize);

    function drawSmoke() {
      smokeOffsetRef.current += 0.2;
      const so = smokeOffsetRef.current;
      const layerColors = ['#00FF41', '#FF00FF', '#00FFFF'];
      for (let layer = 0; layer < 3; layer++) {
        ctx.save();
        ctx.globalAlpha = 0.03 - layer * 0.008;
        const grad = ctx.createRadialGradient(
          canvas.width * 0.3 + Math.sin(so * 0.01 + layer) * 200,
          canvas.height * 0.5 + Math.cos(so * 0.015 + layer) * 100,
          0,
          canvas.width * 0.5, canvas.height * 0.5,
          canvas.width * 0.8
        );
        grad.addColorStop(0, layerColors[layer]);
        grad.addColorStop(1, '#0a0a0a');
        ctx.fillStyle = grad;
        ctx.fillRect(0, 0, canvas.width, canvas.height);
        ctx.restore();
      }
    }

    function animate() {
      ctx.clearRect(0, 0, canvas.width, canvas.height);
      drawSmoke();
      particles.forEach(p => { p.update(); p.draw(); });
      ctx.save();
      ctx.strokeStyle = 'rgba(0,255,255,0.05)';
      ctx.lineWidth = 0.5;
      for (let i = 0; i < particles.length; i++) {
        for (let j = i + 1; j < particles.length; j++) {
          const dx = particles[i].x - particles[j].x;
          const dy = particles[i].y - particles[j].y;
          const dist = Math.sqrt(dx * dx + dy * dy);
          if (dist < 100) {
            ctx.globalAlpha = (1 - dist / 100) * 0.2;
            ctx.beginPath();
            ctx.moveTo(particles[i].x, particles[i].y);
            ctx.lineTo(particles[j].x, particles[j].y);
            ctx.stroke();
          }
        }
      }
      ctx.restore();
      animFrameRef.current = requestAnimationFrame(animate);
    }

    animate();
    return () => {
      cancelAnimationFrame(animFrameRef.current);
      window.removeEventListener('resize', onResize);
      document.removeEventListener('visibilitychange', onVis);
    };
  }, []);

  const menuItems = [
    { level: 1 as number | string, cls: 'csm-level-1', icon: '🔒', title: 'Level 1', desc: 'Phishing – Fake emails & links' },
    { level: 2 as number | string, cls: 'csm-level-2', icon: '⌨️', title: 'Level 2', desc: 'Skimming – ATM/card fraud' },
    { level: 3 as number | string, cls: 'csm-level-3', icon: '🖥️', title: 'Level 3', desc: 'Password cracking – Brute force & dictionary' },
    { level: 4 as number | string, cls: 'csm-level-4', icon: '🛡️', title: 'Level 4', desc: 'Social engineering – Manipulation' },
    { level: 'deepfake', cls: 'csm-deepfake', icon: '🎭', title: 'Deepfake', desc: 'Voice deepfake – AI-generated speech' },
  ];

  return (
    <div className="csm-root">
      <canvas ref={canvasRef} id="csm-canvas" />
      <div className="csm-grid-overlay" />
      <div className="csm-scanlines" />
      <div className="csm-noise" />
      <div className="csm-corner csm-tl" />
      <div className="csm-corner csm-tr" />
      <div className="csm-corner csm-bl" />
      <div className="csm-corner csm-br" />

      <div className="csm-main-container">
        {/* Header */}
        <div className="csm-header">
          <h1 ref={titleRef}>CYBERSEC TRAINING</h1>
          <div className="csm-subtitle">[ TACTICAL SECURITY SIMULATION ]</div>
        </div>

        {/* Character */}
        <div className="csm-character-container">
          <svg className="csm-hacker-svg" viewBox="0 0 400 500" xmlns="http://www.w3.org/2000/svg">
            <defs>
              <linearGradient id="csm-hoodGrad" x1="0%" y1="0%" x2="100%" y2="100%">
                <stop offset="0%" style={{stopColor:'#1a1a1a',stopOpacity:1}}/>
                <stop offset="100%" style={{stopColor:'#0d0d0d',stopOpacity:1}}/>
              </linearGradient>
              <linearGradient id="csm-maskGrad" x1="0%" y1="0%" x2="100%" y2="100%">
                <stop offset="0%" style={{stopColor:'#2a2a2a',stopOpacity:1}}/>
                <stop offset="50%" style={{stopColor:'#1a1a1a',stopOpacity:1}}/>
                <stop offset="100%" style={{stopColor:'#0a0a0a',stopOpacity:1}}/>
              </linearGradient>
              <filter id="csm-glow">
                <feGaussianBlur stdDeviation="3" result="coloredBlur"/>
                <feMerge><feMergeNode in="coloredBlur"/><feMergeNode in="SourceGraphic"/></feMerge>
              </filter>
              <filter id="csm-strongGlow">
                <feGaussianBlur stdDeviation="5" result="coloredBlur"/>
                <feMerge><feMergeNode in="coloredBlur"/><feMergeNode in="coloredBlur"/><feMergeNode in="SourceGraphic"/></feMerge>
              </filter>
            </defs>

            {/* Hood/Head Silhouette */}
            <path d="M200 80 C 150 80, 100 120, 90 180 C 85 210, 85 250, 95 290 C 100 320, 110 350, 130 370 L 130 420 C 130 440, 150 450, 200 450 C 250 450, 270 440, 270 420 L 270 370 C 290 350, 300 320, 305 290 C 315 250, 315 210, 310 180 C 300 120, 250 80, 200 80 Z"
              fill="url(#csm-hoodGrad)" stroke="#00FF41" strokeWidth="2" filter="url(#csm-glow)"/>
            {/* Hood Inner Shadow */}
            <path d="M200 100 C 165 100, 130 130, 125 170 C 122 190, 122 220, 128 250 C 132 270, 140 290, 155 305 L 155 350 C 155 365, 170 375, 200 375 C 230 375, 245 365, 245 350 L 245 305 C 260 290, 268 270, 272 250 C 278 220, 278 190, 275 170 C 270 130, 235 100, 200 100 Z"
              fill="#0a0a0a"/>
            {/* Goggles/Mask */}
            <rect x="125" y="200" width="150" height="70" rx="15"
              fill="url(#csm-maskGrad)" stroke="#00FFFF" strokeWidth="2" filter="url(#csm-glow)"/>
            {/* Goggle Lenses */}
            <ellipse cx="165" cy="235" rx="28" ry="22" fill="#000" stroke="#00FFFF" strokeWidth="1.5"/>
            <ellipse cx="235" cy="235" rx="28" ry="22" fill="#000" stroke="#00FFFF" strokeWidth="1.5"/>
            {/* Glowing Eyes */}
            <circle cx="165" cy="235" r="8" fill="#00FF41" className="csm-eye-glow" filter="url(#csm-strongGlow)"/>
            <circle cx="235" cy="235" r="8" fill="#00FF41" className="csm-eye-glow" filter="url(#csm-strongGlow)"/>
            {/* Eye Details */}
            <circle cx="167" cy="233" r="3" fill="#fff" opacity="0.8"/>
            <circle cx="237" cy="233" r="3" fill="#fff" opacity="0.8"/>
            {/* Goggle Frame Details */}
            <line x1="193" y1="220" x2="207" y2="220" stroke="#00FFFF" strokeWidth="2"/>
            <line x1="193" y1="235" x2="207" y2="235" stroke="#00FFFF" strokeWidth="2"/>
            <line x1="193" y1="250" x2="207" y2="250" stroke="#00FFFF" strokeWidth="2"/>
            {/* Goggle Side Lights */}
            <rect x="115" y="225" width="8" height="20" rx="2" fill="#FF00FF" filter="url(#csm-glow)" opacity="0.8"/>
            <rect x="277" y="225" width="8" height="20" rx="2" fill="#FF00FF" filter="url(#csm-glow)" opacity="0.8"/>
            {/* Shoulders/Torso */}
            <path d="M80 380 C 60 390, 40 420, 30 480 L 30 500 L 370 500 L 370 480 C 360 420, 340 390, 320 380 C 280 360, 240 355, 200 355 C 160 355, 120 360, 80 380 Z"
              fill="#0d0d0d" stroke="#00FF41" strokeWidth="1.5" opacity="0.6"/>
            {/* Jacket Details */}
            <path d="M200 355 L 200 500" stroke="#00FF41" strokeWidth="1" opacity="0.3"/>
            <path d="M120 380 L 150 500" stroke="#00FF41" strokeWidth="1" opacity="0.2"/>
            <path d="M280 380 L 250 500" stroke="#00FF41" strokeWidth="1" opacity="0.2"/>
            {/* Collar */}
            <path d="M150 340 C 150 340, 200 360, 250 340 L 260 370 C 260 370, 200 395, 140 370 Z"
              fill="#1a1a1a" stroke="#00FFFF" strokeWidth="1"/>
            {/* Holographic Tablet */}
            <g transform="translate(220, 400) rotate(-10)">
              <rect x="0" y="0" width="100" height="70" rx="5"
                fill="rgba(0,20,40,0.9)" stroke="#00FF41" strokeWidth="2" className="csm-tablet-glow"/>
              <rect x="5" y="5" width="90" height="60" rx="3" fill="rgba(0,10,20,0.95)"/>
              <line x1="10" y1="12" x2="50" y2="12" stroke="#00FF41" strokeWidth="1.5" opacity="0.9"/>
              <line x1="10" y1="20" x2="70" y2="20" stroke="#00FF41" strokeWidth="1.5" opacity="0.7"/>
              <line x1="10" y1="28" x2="45" y2="28" stroke="#00FF41" strokeWidth="1.5" opacity="0.8"/>
              <line x1="10" y1="36" x2="60" y2="36" stroke="#00FF41" strokeWidth="1.5" opacity="0.6"/>
              <line x1="10" y1="44" x2="40" y2="44" stroke="#00FF41" strokeWidth="1.5" opacity="0.9"/>
              <line x1="10" y1="52" x2="55" y2="52" stroke="#00FF41" strokeWidth="1.5" opacity="0.7"/>
              <text x="55" y="58" className="csm-code-text" fontSize="6">01001</text>
              <ellipse cx="50" cy="75" rx="45" ry="8" fill="url(#csm-hoodGrad)" opacity="0.3" filter="url(#csm-glow)"/>
            </g>
            {/* Hand */}
            <ellipse cx="230" cy="445" rx="15" ry="12" fill="#1a1a1a" stroke="#00FF41" strokeWidth="1" opacity="0.8"/>
            {/* Circuit Patterns */}
            <path d="M120 150 L 140 150 L 145 160" stroke="#00FFFF" strokeWidth="0.5" fill="none" opacity="0.4"/>
            <path d="M280 150 L 260 150 L 255 160" stroke="#00FFFF" strokeWidth="0.5" fill="none" opacity="0.4"/>
            <circle cx="145" cy="160" r="2" fill="#00FFFF" opacity="0.5"/>
            <circle cx="255" cy="160" r="2" fill="#00FFFF" opacity="0.5"/>
            {/* Chin/Mouth */}
            <path d="M175 290 C 175 290, 200 300, 225 290 L 225 305 C 225 305, 200 315, 175 305 Z"
              fill="#0a0a0a" stroke="#00FF41" strokeWidth="0.5" opacity="0.5"/>
          </svg>
        </div>

        {/* Right Side Menu */}
        <div className="csm-right-menu">
          {menuItems.map(item => (
            <div key={String(item.level)} className={`csm-menu-item ${item.cls}`} onClick={() => selectLevel(item.level)}>
              <div className="csm-hexagon">
                <svg className="csm-hexagon-bg" viewBox="0 0 70 80">
                  <polygon points="35,2 66,20 66,58 35,76 4,58 4,20"/>
                </svg>
                <span className="csm-hexagon-icon">{item.icon}</span>
              </div>
              <div className="csm-tooltip">
                <div className="csm-tooltip-title">{item.title}</div>
                <div className="csm-tooltip-desc">{item.desc}</div>
              </div>
            </div>
          ))}
        </div>

        {/* Bottom Container */}
        <div className="csm-bottom-container">
          <div className="csm-bottom-block" onClick={openWiki}>
            <div className="csm-block-shape">
              <span className="csm-block-icon">📖</span>
              <span className="csm-block-text">WIKI</span>
            </div>
            <div className="csm-block-tooltip">Security knowledge base</div>
          </div>
          <div className="csm-bottom-block" onClick={openQuiz}>
            <div className="csm-block-shape">
              <span className="csm-block-icon">❓</span>
              <span className="csm-block-text">QUIZ</span>
            </div>
            <div className="csm-block-tooltip">Test your skills</div>
          </div>
        </div>
      </div>

      {/* Notification */}
      {notification && (
        <div className={`csm-notification ${notification.removing ? 'csm-notif-out' : ''}`}>
          <div className="csm-notif-title">{notification.title}</div>
          <div className="csm-notif-message">{notification.message}</div>
        </div>
      )}
    </div>
  );
};

export default CybersecMenu;
