import { getCurrentInstance } from 'vue';

export default (data: any, container: any, wrapper: any, activeIndex) => {
  const { proxy }: any = getCurrentInstance();

  // 手势开始
  const onTouchStart = (e) => {
    data.startX = data.scrollOffset + e.touchstartX;

    container.value.style.transition = 'none';
    container.value.style.willChange = 'transform';
  };

  // 手势移动
  const onTouchMove = (e: any) => {
    data.scrollOffset = data.startX - e.touchmoveX;
  };

  // 手势结束
  const onTouchEnd = () => {
    const maxScrollOffset =
      container.value.clientWidth - wrapper.value.clientWidth;

    container.value.style.transition = '';
    container.value.style.willChange = '';

    if (data.scrollOffset < 0 || !data.isOverflowing) {
      data.scrollOffset = 0;
    } else if (data.scrollOffset >= maxScrollOffset) {
      data.scrollOffset = maxScrollOffset;
    }
  };

  // 偏移位置
  const newOffset = (direction: string) => {
    const clientWidth = wrapper.value.clientWidth;

    if (direction === 'prev') {
      return Math.max(data.scrollOffset - clientWidth, 0);
    } else {
      return Math.min(
        data.scrollOffset + clientWidth,
        container.value.clientWidth - clientWidth
      );
    }
  };

  // 内容滑动切换.
  const handleSwipeItem = (direction) => {
    // 左
    if (direction === 'next') {
      const index = activeIndex.value + 1;

      const tab = data.tabs[index];

      if (tab) {
        proxy.tabNavClick(tab);
      }
    }

    // 右
    if (direction === 'prev') {
      const index = activeIndex.value - 1;

      const tab = data.tabs[index];

      if (tab) {
        proxy.tabNavClick(tab);
      }
    }
  };

  return {
    onTouchStart,
    onTouchMove,
    onTouchEnd,
    newOffset,
    handleSwipeItem,
  };
};