@loading-prefix: ~'@{icecream-prefix}-loading';

.@{loading-prefix} {
  @loading-animation-wrapper-max-height: 400px; // 参考 Antd 的 Spin
  @loading-opacity: .5; // 参考 Antd 的 Spin

  display: flex;
  flex-direction: column;
  position: relative;
  min-width: 28px;
  min-height: 14px;

  &-animation {
    @loading-animation-dot: ~'@{loading-prefix}-loading-animation-dot';

    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100%; // `min` overrides `max` overrides `height` / `width`
    max-height: @loading-animation-wrapper-max-height;
    display: flex;
    justify-content: center;
    align-items: center;

    &-dots {
      display: inline-block;
      white-space: nowrap;
    }

    &-dot {
      display: inline-block;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: @icecream-primary-color;
      animation: @loading-animation-dot 1.2s infinite ease-in-out both;

      & + & {
        margin-left: 5px;
      }

      &:nth-child(2) {
        animation-delay: 0.15s;
      }

      &:nth-child(3) {
        animation-delay: 0.25s;
      }
    }

    @keyframes @loading-animation-dot {
      50% {
        transform: translate(0, 0);
      }

      75% {
        transform: translate(0, -100%);
      }
    }
  }

  &-content {
    flex: 1;
    min-height: 0;
  }

  &:not(.@{loading-prefix}-loading) {
    > .@{loading-prefix}-content {
      transition: visibility 0s, opacity @icecream-transitions;
    }

    > .@{loading-prefix}-animation {
      visibility: hidden;
      opacity: 0;
      transition: opacity @icecream-transitions, visibility 0s @icecream-transitions;
    }
  }

  &.@{loading-prefix}-loading {
    > .@{loading-prefix}-content {
      transition: opacity @icecream-transitions, visibility 0s @icecream-transitions;
    }

    > .@{loading-prefix}-animation {
      transition: visibility 0s, opacity @icecream-transitions;
    }

    &.@{loading-prefix}-mode-visible {
      > .@{loading-prefix}-content {
        opacity: @loading-opacity;
      }

      // mask of content
      &::after {
        content: '';
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: 100%;
      }
    }

    &.@{loading-prefix}-mode-hidden {
      > .@{loading-prefix}-content {
        visibility: hidden;
        opacity: 0;
      }
    }
  }
}