// A compact media-player control: big play/pause button, seekable progress
// bar, and transport buttons. Presentation only — playback state and handlers
// come from useAudio.js so the Home (whole book) and Reader (chapter) players
// can share this UI.
function formatTime(seconds) {
  if (!Number.isFinite(seconds) || seconds < 0) return '0:00';
  const mins = Math.floor(seconds / 60);
  const secs = Math.floor(seconds % 60);
  return `${mins}:${String(secs).padStart(2, '0')}`;
}

function PlayIcon() {
  return (
    <svg viewBox="0 0 20 20" width="20" height="20" fill="currentColor">
      <path d="M5.5 3.6c0-.9 1-1.45 1.76-.97l9.4 5.9c.72.45.72 1.5 0 1.94l-9.4 5.9c-.76.48-1.76-.07-1.76-.97V3.6z" />
    </svg>
  );
}

function PauseIcon() {
  return (
    <svg viewBox="0 0 20 20" width="20" height="20" fill="currentColor">
      <rect x="4.5" y="3.5" width="4" height="13" rx="1" />
      <rect x="11.5" y="3.5" width="4" height="13" rx="1" />
    </svg>
  );
}

function StopIcon() {
  return (
    <svg viewBox="0 0 20 20" width="16" height="16" fill="currentColor">
      <rect x="4.5" y="4.5" width="11" height="11" rx="1.5" />
    </svg>
  );
}

function Seek10Icon({ direction }) {
  const flip = direction === 'back' ? 'scale(-1,1) translate(-20,0)' : undefined;
  return (
    <svg viewBox="0 0 20 20" width="18" height="18" fill="none" stroke="currentColor" strokeWidth="1.6">
      <g transform={flip}>
        <path d="M4 8.5a6.5 6.5 0 1 1 1.2 5.3" strokeLinecap="round" />
        <path d="M3 5.5v3.3h3.3" strokeLinecap="round" strokeLinejoin="round" />
      </g>
      <text x="10" y="12.2" fontSize="6.5" fontFamily="sans-serif" stroke="none" fill="currentColor" textAnchor="middle">10</text>
    </svg>
  );
}

function NextTrackIcon() {
  return (
    <svg viewBox="0 0 20 20" width="16" height="16" fill="currentColor">
      <path d="M5 4.3c0-.8.9-1.3 1.6-.9l7.4 4.7c.7.4.7 1.4 0 1.8l-7.4 4.7c-.7.4-1.6-.1-1.6-.9V4.3z" />
      <rect x="14" y="3.7" width="1.6" height="12.6" rx="0.5" />
    </svg>
  );
}

export default function AudioPlayer({
  title,
  subtitle,
  errorMessage,
  status, // 'idle' | 'playing' | 'paused' | 'error'
  currentTime = 0,
  duration = 0,
  onPlay,
  onTogglePause,
  onSeekBack,
  onSeekForward,
  onSeekTo,
  onNext,
  nextDisabled,
  onStop,
  controls, // optional extra controls (e.g. book/narrator selects), rendered top-right
}) {
  const isActive = status === 'playing' || status === 'paused';
  const progressPct = duration > 0 ? Math.min(100, (currentTime / duration) * 100) : 0;

  return (
    <div className="rounded-3xl border border-slate-200 bg-white p-4 shadow-panel sm:p-5">
      <div className="flex flex-wrap items-start justify-between gap-3">
        <div className="min-w-0 flex-1">
          <h3 className="truncate text-sm font-semibold text-slate-900 sm:text-base">{title}</h3>
          <p className="mt-0.5 truncate text-xs text-slate-500 sm:text-sm">{subtitle}</p>
          {status === 'error' && errorMessage && (
            <p className="mt-1 text-xs text-rose-600">{errorMessage}</p>
          )}
        </div>
        {controls && <div className="flex flex-wrap items-center gap-2">{controls}</div>}
      </div>

      {isActive && (
        <div className="mt-4">
          <input
            type="range"
            min={0}
            max={duration || 0}
            step={0.1}
            value={Math.min(currentTime, duration || 0)}
            onChange={(e) => onSeekTo?.(Number(e.target.value))}
            disabled={!duration}
            className="h-1.5 w-full cursor-pointer appearance-none rounded-full bg-slate-200 accent-sky-600 disabled:cursor-default"
            style={{ background: `linear-gradient(to right, rgb(2 132 199) ${progressPct}%, rgb(226 232 240) ${progressPct}%)` }}
            aria-label="Seek"
          />
          <div className="mt-1 flex justify-between text-xs tabular-nums text-slate-400">
            <span>{formatTime(currentTime)}</span>
            <span>{formatTime(duration)}</span>
          </div>
        </div>
      )}

      <div className="mt-3 flex items-center justify-center gap-3">
        {isActive ? (
          <>
            <button
              type="button"
              onClick={onSeekBack}
              title="Rewind 10 seconds"
              aria-label="Rewind 10 seconds"
              className="flex h-9 w-9 items-center justify-center rounded-full text-slate-600 hover:bg-slate-100"
            >
              <Seek10Icon direction="back" />
            </button>
            <button
              type="button"
              onClick={onTogglePause}
              aria-label={status === 'paused' ? 'Resume' : 'Pause'}
              className="flex h-12 w-12 items-center justify-center rounded-full bg-sky-600 text-white shadow-sm hover:bg-sky-500"
            >
              {status === 'paused' ? <PlayIcon /> : <PauseIcon />}
            </button>
            <button
              type="button"
              onClick={onSeekForward}
              title="Fast-forward 10 seconds"
              aria-label="Fast-forward 10 seconds"
              className="flex h-9 w-9 items-center justify-center rounded-full text-slate-600 hover:bg-slate-100"
            >
              <Seek10Icon direction="forward" />
            </button>
            {onNext && (
              <button
                type="button"
                onClick={onNext}
                disabled={nextDisabled}
                title="Next chapter"
                aria-label="Next chapter"
                className="flex h-9 w-9 items-center justify-center rounded-full text-slate-600 hover:bg-slate-100 disabled:opacity-30 disabled:hover:bg-transparent"
              >
                <NextTrackIcon />
              </button>
            )}
            <button
              type="button"
              onClick={onStop}
              title="Stop"
              aria-label="Stop"
              className="flex h-9 w-9 items-center justify-center rounded-full text-slate-600 hover:bg-slate-100"
            >
              <StopIcon />
            </button>
          </>
        ) : (
          <button
            type="button"
            onClick={onPlay}
            className="flex h-12 w-12 items-center justify-center rounded-full bg-sky-600 text-white shadow-sm hover:bg-sky-500"
            aria-label="Play"
          >
            <PlayIcon />
          </button>
        )}
      </div>
    </div>
  );
}