import { useEffect, useRef } from 'react'

/**
 * Animated background component that draws an interactive particle effect
 */
const AnimatedBackground = () => {
  const canvasRef = useRef<HTMLCanvasElement>(null)

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

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

    // Set canvas size to match window
    const setCanvasSize = () => {
      canvas.width = window.innerWidth
      canvas.height = window.innerHeight
    }

    setCanvasSize()
    window.addEventListener('resize', setCanvasSize)

    // Create particles
    const particles: Particle[] = []
    const particleCount = 30

    interface Particle {
      x: number
      y: number
      size: number
      speedX: number
      speedY: number
      opacity: number
      color: string
    }

    // Color palette matching theme
    const colors = [
      'rgba(74, 118, 196, 0.5)', // primary blue
      'rgba(155, 125, 255, 0.5)', // purple
      'rgba(251, 177, 60, 0.5)', // gold
    ]

    // Create initial particles
    for (let i = 0; i < particleCount; i++) {
      particles.push({
        x: Math.random() * canvas.width,
        y: Math.random() * canvas.height,
        size: Math.random() * 3 + 1,
        speedX: Math.random() * 0.2 - 0.1,
        speedY: Math.random() * 0.2 - 0.1,
        opacity: Math.random() * 0.07 + 0.03,
        color: colors[Math.floor(Math.random() * colors.length)],
      })
    }

    // Animation loop
    const animate = () => {
      // Clear canvas with transparent black to create fade effect
      ctx.fillStyle = 'rgba(15, 15, 15, 0.1)'
      ctx.fillRect(0, 0, canvas.width, canvas.height)

      // Update and draw particles
      particles.forEach((particle) => {
        // Update position
        particle.x += particle.speedX
        particle.y += particle.speedY

        // Wrap around edges
        if (particle.x < 0) particle.x = canvas.width
        if (particle.x > canvas.width) particle.x = 0
        if (particle.y < 0) particle.y = canvas.height
        if (particle.y > canvas.height) particle.y = 0

        // Draw particle
        ctx.beginPath()
        ctx.arc(particle.x, particle.y, particle.size, 0, Math.PI * 2)
        ctx.fillStyle = particle.color.replace('0.5', `${particle.opacity}`)
        ctx.fill()

        // Connect particles that are close to each other
        particles.forEach((otherParticle) => {
          const dx = particle.x - otherParticle.x
          const dy = particle.y - otherParticle.y
          const distance = Math.sqrt(dx * dx + dy * dy)

          if (distance < 100) {
            ctx.beginPath()
            ctx.strokeStyle = particle.color.replace('0.5', `${particle.opacity * 0.5}`)
            ctx.lineWidth = 0.2
            ctx.moveTo(particle.x, particle.y)
            ctx.lineTo(otherParticle.x, otherParticle.y)
            ctx.stroke()
          }
        })
      })

      requestAnimationFrame(animate)
    }

    // Start animation
    animate()

    // Cleanup
    return () => {
      window.removeEventListener('resize', setCanvasSize)
    }
  }, [])

  return <canvas ref={canvasRef} className="animated-background" aria-hidden="true" />
}

export default AnimatedBackground