'use client'

import { useRef, useEffect, useState, useCallback } from 'react'
import { cn } from '@/lib/ui-styles'

interface AudioVisualizerProps {
  audioElement: HTMLAudioElement | null
  isPlaying: boolean
  size?: 'sm' | 'md' | 'lg'
  coverImage?: string | null
  showCoverOnPause?: boolean
  className?: string
}

// 默认音频封面图
function DefaultAudioCover({ size }: { size: 'sm' | 'md' | 'lg' }) {
  const sizeClasses = {
    sm: 'w-full h-full',
    md: 'w-full h-full',
    lg: 'w-full h-full',
  }
  
  const iconSizes = {
    sm: 'w-8 h-8',
    md: 'w-12 h-12',
    lg: 'w-16 h-16',
  }

  return (
    <div
      className={cn(
        sizeClasses[size],
        'relative overflow-hidden rounded-lg border',
        'bg-slate-100 border-slate-200 dark:bg-slate-800 dark:border-slate-700'
      )}
    >
      {/* 中心音符图标 */}
      <div className="absolute inset-0 flex items-center justify-center">
        <div className="p-4 rounded-md bg-white border border-slate-200 dark:bg-slate-900 dark:border-slate-700">
          <svg
            className={cn(iconSizes[size], 'text-slate-500 dark:text-slate-300')}
            fill="currentColor"
            viewBox="0 0 24 24"
          >
            <path d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2z" />
          </svg>
        </div>
      </div>
    </div>
  )
}

// 音频频谱可视化器
export default function AudioVisualizer({
  audioElement,
  isPlaying,
  size = 'md',
  coverImage,
  showCoverOnPause = true,
  className,
}: AudioVisualizerProps) {
  const canvasRef = useRef<HTMLCanvasElement>(null)
  const animationRef = useRef<number | null>(null)
  const audioContextRef = useRef<AudioContext | null>(null)
  const analyserRef = useRef<AnalyserNode | null>(null)
  const sourceRef = useRef<MediaElementAudioSourceNode | null>(null)
  const connectedAudioRef = useRef<HTMLAudioElement | null>(null)
  const [isVisualizerActive, setIsVisualizerActive] = useState(false)
  const [showCover, setShowCover] = useState(true)

  // 尺寸配置
  const sizeConfig = {
    sm: { width: 160, height: 120, bars: 36, maxBarHeight: 52 },
    md: { width: 240, height: 180, bars: 48, maxBarHeight: 76 },
    lg: { width: 320, height: 220, bars: 64, maxBarHeight: 96 },
  }

  const config = sizeConfig[size]

  // 初始化音频分析器
  const initAudioContext = useCallback(() => {
    if (!audioElement) return

    const audioElementChanged = connectedAudioRef.current !== audioElement

    try {
      if (!audioContextRef.current) {
        audioContextRef.current = new (window.AudioContext || (window as any).webkitAudioContext)()
      }

      const audioContext = audioContextRef.current

      if (audioElementChanged || !analyserRef.current) {
        if (sourceRef.current) {
          try {
            sourceRef.current.disconnect()
          } catch (e) {
            // 忽略断开连接的错误
          }
          sourceRef.current = null
        }

        const analyser = audioContext.createAnalyser()
        analyser.fftSize = 512 // 增加 FFT 大小以获得更精细的频率数据
        analyser.smoothingTimeConstant = 0.75

        const source = audioContext.createMediaElementSource(audioElement)
        source.connect(analyser)
        analyser.connect(audioContext.destination)

        sourceRef.current = source
        analyserRef.current = analyser
        connectedAudioRef.current = audioElement

        console.log('[AudioVisualizer] Audio context initialized for new audio element')
      }

      setIsVisualizerActive(true)
    } catch (error) {
      console.error('[AudioVisualizer] Failed to initialize audio context:', error)
    }
  }, [audioElement])

  // 绘制低调的条形频谱
  const draw = useCallback(() => {
    const canvas = canvasRef.current
    const analyser = analyserRef.current
    if (!canvas || !analyser) return

    const ctx = canvas.getContext('2d', { willReadFrequently: true })
    if (!ctx) return

    const bufferLength = analyser.frequencyBinCount
    const dataArray = new Uint8Array(bufferLength)
    analyser.getByteFrequencyData(dataArray)

    const { width, height, bars, maxBarHeight } = config
    const centerY = height / 2
    const isDarkMode = document.documentElement.classList.contains('dark')

    // 清除画布
    ctx.clearRect(0, 0, width, height)

    ctx.fillStyle = isDarkMode ? 'rgba(15, 23, 42, 1)' : 'rgba(248, 250, 252, 1)'
    ctx.fillRect(0, 0, width, height)

    // 绘制频谱条
    const usableData = Math.floor(bufferLength * 0.7)
    const gap = size === 'sm' ? 2 : 3
    const barWidth = Math.max(2, (width - (bars - 1) * gap) / bars)

    for (let i = 0; i < bars; i++) {
      // 使用多个频率数据点的平均值来平滑
      const dataIndex = Math.floor((i / bars) * usableData)
      const nextIndex = Math.min(dataIndex + 1, usableData - 1)
      const value = (dataArray[dataIndex] + dataArray[nextIndex]) / 2
      
      const barHeight = Math.max(6, (value / 255) * maxBarHeight)
      const x = i * (barWidth + gap)
      const y = centerY - barHeight / 2
      const intensity = value / 255

      ctx.fillStyle = isDarkMode
        ? `rgba(148, 163, 184, ${0.34 + intensity * 0.42})`
        : `rgba(71, 85, 105, ${0.26 + intensity * 0.42})`
      ctx.fillRect(x, y, barWidth, barHeight)
    }

    animationRef.current = requestAnimationFrame(draw)
  }, [config, size])

  // 处理播放状态变化
  useEffect(() => {
    if (isPlaying && audioElement) {
      setShowCover(false)
      if (!audioContextRef.current || connectedAudioRef.current !== audioElement) {
        initAudioContext()
      }
      if (audioContextRef.current?.state === 'suspended') {
        audioContextRef.current.resume()
      }
      requestAnimationFrame(() => {
        if (analyserRef.current) {
          draw()
        }
      })
    } else if (!isPlaying) {
      if (animationRef.current) {
        cancelAnimationFrame(animationRef.current)
        animationRef.current = null
      }
      if (showCoverOnPause) {
        setShowCover(true)
      }
    }

    return () => {
      if (animationRef.current) {
        cancelAnimationFrame(animationRef.current)
      }
    }
  }, [isPlaying, audioElement, initAudioContext, draw, showCoverOnPause])

  // 清理
  useEffect(() => {
    return () => {
      if (animationRef.current) {
        cancelAnimationFrame(animationRef.current)
      }
    }
  }, [])

  const containerClasses = {
    sm: 'w-40 h-[120px]',
    md: 'w-[240px] h-[180px]',
    lg: 'w-[320px] h-[220px]',
  }

  return (
    <div className={cn('relative overflow-hidden rounded-lg border border-slate-200 dark:border-slate-700', containerClasses[size], className)}>
      {/* 封面图层 */}
      <div
        className={cn(
          'absolute inset-0 transition-opacity duration-300 z-10',
          showCover && !isPlaying ? 'opacity-100' : 'opacity-0 pointer-events-none'
        )}
      >
        {coverImage ? (
          // eslint-disable-next-line @next/next/no-img-element
          <img
            src={coverImage}
            alt="Audio cover"
            className="w-full h-full object-cover rounded-lg"
          />
        ) : (
          <DefaultAudioCover size={size} />
        )}
      </div>

      {/* 可视化层 */}
      <div
        className={cn(
          'absolute inset-0 transition-opacity duration-300',
          isPlaying || isVisualizerActive ? 'opacity-100' : 'opacity-0'
        )}
      >
        <canvas
          ref={canvasRef}
          width={config.width}
          height={config.height}
          className="w-full h-full"
        />
      </div>

      {/* 未播放时的默认背景（当没有封面图时） */}
      {!coverImage && !isPlaying && !showCover && (
        <DefaultAudioCover size={size} />
      )}
    </div>
  )
}