import { doc } from '@/internal/env';
import { prependStyles } from '@/internal/prependStyles';

let style: HTMLStyleElement | null = null;

export function createCursorStyles(prefix: string) {
  if (style) {
    return style;
  }

  style = doc.createElement('style');
  prependStyles(style);

  style.innerHTML = `
    .${prefix}-container.${prefix}-hide-default,
    .${prefix}-container.${prefix}-hide-default * {
      cursor: none;
    }

    .${prefix} {
      position: absolute;
      top: 0;
      left: 0;
      width: 0;
      height: 0;
      z-index: 999;
      pointer-events: none;

      transition: opacity 0.25s;
      opacity: 0;

      --cursor-w: 50px;
      --cursor-h: 50px;
    }
    
    .${prefix}-in-window {
      position: fixed;
    }
      
    .${prefix}-visible {
      opacity: 1;
    }

    .${prefix}-disabled {
      opacity: 0;
    }

    .${prefix}__inner {
      position: relative;
      width: var(--cursor-w);
      height: var(--cursor-h);
      margin-left: calc(var(--cursor-w) / -2);
      margin-top: calc(var(--cursor-h) / -2);

      background-color: rgba(0, 0, 0, 0.25);
    }

    .${prefix}_rtl .${prefix}__inner {
      margin-right: calc(var(--cursor-w) / -2);
    }

    .${prefix}__inner > * {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      opacity: 0;
      transition: opacity 0.25s linear;
    }

    .${prefix}__inner > *.active {
      opacity: 1;
    }
  `;

  return style;
}