'use client';

import { useEffect, useRef, useCallback, useState } from 'react';

interface Particle {
  x: number;
  y: number;
  targetX: number;
  targetY: number;
  vx: number;
  vy: number;
  size: number;
  opacity: number;
  color: string;
  life: number;
  maxLife: number;
  stage: 'idle' | 'dispersing' | 'reforming';
}

interface SealAnimationEnhancedProps {
  width?: number;
  height?: number;
  particleCount?: number;
  colors?: string[];
  sealText?: string;
  animationStages?: boolean;
  onStageChange?: (stage: string) => void;
  className?: string;
}

export function SealAnimationEnhanced({
  width = 300,
  height = 300,
  particleCount = 150,
  colors = ['#C41E3A', '#D4A574', '#8B4513'],
  sealText: _sealText = '睿新',
  animationStages = true,
  onStageChange,
  className = '',
}: SealAnimationEnhancedProps) {
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const particlesRef = useRef<Particle[]>([]);
  const animationRef = useRef<number | null>(null);
  const [_currentStage, setCurrentStage] = useState<'idle' | 'dispersing' | 'reforming'>('idle');
  const stageTimerRef = useRef<NodeJS.Timeout | null>(null);

  const createSealShape = useCallback((width: number, height: number) => {
    const centerX = width / 2;
    const centerY = height / 2;
    const sealSize = Math.min(width, height) * 0.35;
    const particles: { x: number; y: number }[] = [];

    for (let i = 0; i < particleCount; i++) {
      const angle = (i / particleCount) * Math.PI * 2;
      const radius = sealSize * (0.8 + Math.random() * 0.4);
      particles.push({
        x: centerX + Math.cos(angle) * radius * (Math.random() > 0.5 ? 1 : 0.8),
        y: centerY + Math.sin(angle) * radius * (Math.random() > 0.5 ? 1 : 0.8),
      });
    }

    return particles;
  }, [particleCount]);

  const createParticle = useCallback(
    (x: number, y: number, targetX: number, targetY: number): Particle => {
      const color = colors[Math.floor(Math.random() * colors.length)] ?? '#C41E3A';
      const size = 2 + Math.random() * 3;
      const maxLife = 200 + Math.random() * 100;

      return {
        x,
        y,
        targetX,
        targetY,
        vx: (Math.random() - 0.5) * 2,
        vy: (Math.random() - 0.5) * 2,
        size,
        opacity: 0.6 + Math.random() * 0.4,
        color,
        life: 0,
        maxLife,
        stage: 'idle',
      };
    },
    [colors]
  );

  useEffect(() => {
    const canvas = canvasRef.current;
    if (!canvas) {return;}

    const ctx = canvas.getContext('2d');
    if (!ctx) {return;}

    canvas.width = width;
    canvas.height = height;

    const sealPositions = createSealShape(width, height);
    particlesRef.current = sealPositions.map((pos) =>
      createParticle(pos.x, pos.y, pos.x, pos.y)
    );

    if (animationStages) {
      stageTimerRef.current = setTimeout(() => {
        setCurrentStage('dispersing');
        onStageChange?.('dispersing');
        
        particlesRef.current.forEach(p => {
          p.vx = (Math.random() - 0.5) * 4;
          p.vy = (Math.random() - 0.5) * 4;
          p.stage = 'dispersing';
        });

        setTimeout(() => {
          setCurrentStage('reforming');
          onStageChange?.('reforming');
          
          particlesRef.current.forEach(p => {
            p.stage = 'reforming';
          });

          setTimeout(() => {
            setCurrentStage('idle');
            onStageChange?.('idle');
          }, 3000);
        }, 2000);
      }, 3000);
    }

    const animate = () => {
      ctx.clearRect(0, 0, width, height);

      particlesRef.current.forEach((particle) => {
        if (particle.stage === 'reforming') {
          const dx = particle.targetX - particle.x;
          const dy = particle.targetY - particle.y;
          particle.vx += dx * 0.02;
          particle.vy += dy * 0.02;
          particle.vx *= 0.95;
          particle.vy *= 0.95;
        }

        particle.x += particle.vx;
        particle.y += particle.vy;
        particle.life++;

        ctx.beginPath();
        ctx.arc(particle.x, particle.y, particle.size, 0, Math.PI * 2);
        ctx.fillStyle = particle.color;
        ctx.globalAlpha = particle.opacity;
        ctx.fill();
        ctx.globalAlpha = 1;
      });

      animationRef.current = requestAnimationFrame(animate);
    };

    animate();

    return () => {
      if (animationRef.current) {
        cancelAnimationFrame(animationRef.current);
      }
      if (stageTimerRef.current) {
        clearTimeout(stageTimerRef.current);
      }
    };
  }, [width, height, createSealShape, createParticle, animationStages, onStageChange]);

  return (
    <canvas
      ref={canvasRef}
      className={className}
      style={{ width, height }}
    />
  );
}