music-web/web/src/components/player/ProgressBar.tsx

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

interface ProgressBarProps {
  progress: number
  duration: number
  onSeek: (time: number) => void
  className?: string
}

export function ProgressBar({ progress, duration, onSeek, className = '' }: ProgressBarProps) {
  const [isDragging, setIsDragging] = useState(false)
  const barRef = useRef<HTMLDivElement>(null)
  
  const percent = duration > 0 ? (progress / duration) * 100 : 0
  
  const handleSeek = useCallback((clientX: number) => {
    if (!barRef.current) return
    const rect = barRef.current.getBoundingClientRect()
    const x = Math.max(0, Math.min(clientX - rect.left, rect.width))
    const ratio = x / rect.width
    onSeek(duration * ratio)
  }, [duration, onSeek])
  
  const handleClick = (e: React.MouseEvent) => handleSeek(e.clientX)
  
  const handleMouseDown = (e: React.MouseEvent) => {
    setIsDragging(true)
    handleSeek(e.clientX)
  }
  
  const handleMouseMove = (e: React.MouseEvent) => {
    if (isDragging) handleSeek(e.clientX)
  }
  
  const handleMouseUp = () => setIsDragging(false)
  
  const formatTime = (sec: number) => {
    const m = Math.floor(sec / 60)
    const s = Math.floor(sec % 60)
    return `${m}:${s.toString().padStart(2, '0')}`
  }
  
  return (
    <div className={`w-full ${className}`}>
      <div
        ref={barRef}
        className="relative h-1 bg-music-border rounded-full cursor-pointer group"
        onClick={handleClick}
        onMouseDown={handleMouseDown}
        onMouseMove={handleMouseMove}
        onMouseUp={handleMouseUp}
        onMouseLeave={handleMouseUp}
      >
        <div
          className="absolute left-0 top-0 h-full bg-music-accent rounded-full transition-none"
          style={{ width: `${percent}%` }}
        />
        <div
          className="absolute top-1/2 -translate-y-1/2 w-3 h-3 bg-music-accent rounded-full opacity-0 group-hover:opacity-100 transition-opacity -ml-1.5"
          style={{ left: `${percent}%` }}
        />
      </div>
      <div className="flex justify-between mt-1 text-xs text-music-muted">
        <span>{formatTime(progress)}</span>
        <span>{formatTime(duration)}</span>
      </div>
    </div>
  )
}