/** 弹窗支持拖拽 license by http://eleadmin.com */

/**
 * 获取父元素
 * @param el
 * @param parentClass
 * @returns
 */
function queryParentByClass(el, parentClass) {
  if(!el){
    return;
  }
  if (el === document) {
    return;
  }
  if (el.classList.contains(parentClass)) {
    return el;
  }
  return queryParentByClass(el.parentNode, parentClass);
}

/**
 * 获取样式
 * @param el
 * @returns
 */
function getCurrentStyle(el) {
  return el.currentStyle || window.getComputedStyle(el, null) || {};
}

/**
 * 初始化modal样式
 * @param modalEl
 */
function initModalStyle(modalEl) {
  modalEl.style.top = modalEl.offsetTop + 'px';
  modalEl.style.left = modalEl.offsetLeft + 'px';
  modalEl.style.bottom = 'auto';
  modalEl.style.right = 'auto';
  modalEl.style.margin = 0;
  modalEl.style.position = 'relative';
  modalEl.style.display = 'inline-block';
}

/**
 * 弹窗最大化切换
 * @param btnEl
 * @param fullscreen
 */
function toggleFullscreen(btnEl, fullscreen) {
  const modalEl = queryParentByClass(btnEl, 'ant-modal');
  if (modalEl) {
    const wrapEl = modalEl.parentNode, fullClass = 'ele-modal-wrap-fullscreen';
    if (typeof fullscreen === 'undefined') {
      wrapEl.classList.toggle(fullClass);
    } else if (fullscreen) {
      wrapEl.classList.add(fullClass);
    } else {
      wrapEl.classList.remove(fullClass);
    }
  }
}

/**
 * 弹窗支持拖动
 */
export function modalMovable() {
  document.addEventListener('mousedown', function (event) {
    const headerEl = queryParentByClass(event.target, 'ant-modal-header');
    if (!headerEl) {
      return;
    }
    const modalEl = headerEl.parentNode.parentNode, wrapEl = modalEl.parentNode;
    const moveOut = wrapEl.classList.contains('ele-modal-move-out');
    if (!wrapEl.classList.contains('ele-modal-movable') && !moveOut) {
      return;
    }
    if (wrapEl.classList.contains('ele-modal-wrap-fullscreen')) {
      return;
    }
    modalEl.style.userSelect = 'none';
    initModalStyle(modalEl);
    // 获取原始位置
    const downX = event.clientX;
    const downY = event.clientY;
    const downOL = modalEl.offsetLeft;
    const downOT = modalEl.offsetTop;

    // 鼠标移动事件
    const mousemoveFn = function (e) {
      let l = e.clientX - downX + downOL;
      let t = e.clientY - downY + downOT;
      // 边界判断
      if (!moveOut) {
        const screenWidth = document.documentElement.clientWidth || document.body.clientWidth;
        let limitL = screenWidth - modalEl.clientWidth;
        if (l < 1) {
          l = 1;
        } else if (l > limitL - 1) {
          l = limitL - 1;
        }
        const screenHeight = document.documentElement.clientHeight || document.body.clientHeight;
        let limitT = screenHeight - modalEl.clientHeight;
        if (t > limitT - 2) {
          t = limitT - 2;
        }
        if (t < 1) {
          t = 1;
        }
      }
      // 移动dialog
      modalEl.style.left = l + 'px';
      modalEl.style.top = t + 'px';
    }

    // 鼠标抬起事件
    const mouseupFn = function () {
      modalEl.style.userSelect = null;
      document.removeEventListener('mousemove', mousemoveFn);
      document.removeEventListener('mouseup', mouseupFn);
    };

    // 添加鼠标事件监听
    document.addEventListener('mousemove', mousemoveFn);
    document.addEventListener('mouseup', mouseupFn);
  });
}

/**
 * 弹窗支持拉伸
 */
export function modalResizable() {
  document.addEventListener('mousedown', function (event) {
    const modalEl = queryParentByClass(event.target, 'ant-modal');
    if (!modalEl) {
      return;
    }
    const wrapEl = modalEl.parentNode;
    if (!wrapEl.classList.contains('ele-modal-resizable')) {
      return;
    }
    if (wrapEl.classList.contains('ele-modal-wrap-fullscreen')) {
      return;
    }
    const limitX = modalEl.clientWidth + modalEl.offsetLeft - wrapEl.scrollLeft;
    const limitY = modalEl.clientHeight + modalEl.offsetTop - wrapEl.scrollTop;
    if (
      event.clientX > limitX ||
      limitX - event.clientX > 10 ||
      event.clientY > limitY ||
      limitY - event.clientY > 10
    ) {
      return;
    }
    modalEl.style.userSelect = 'none';
    initModalStyle(modalEl);
    // 获取原始位置
    const downX = event.clientX;
    const downY = event.clientY;
    const downW = modalEl.clientWidth;
    const downH = modalEl.clientHeight;

    // 鼠标移动事件
    const mousemoveFn = function (e) {
      const w = e.clientX - downX + downW;
      const h = e.clientY - downY + downH;
      const nw = (w < 260 ? 260 : w) + 'px';
      // 移动dialog
      modalEl.style.width = nw;
      modalEl.style.maxWidth = nw;
      modalEl.style.minWidth = nw;
      modalEl.style.height = (h < 160 ? 160 : h) + 'px';
    }

    // 鼠标抬起事件
    const mouseupFn = function () {
      modalEl.style.userSelect = null;
      document.removeEventListener('mousemove', mousemoveFn);
      document.removeEventListener('mouseup', mouseupFn);
    };

    // 添加鼠标事件监听
    document.addEventListener('mousemove', mousemoveFn);
    document.addEventListener('mouseup', mouseupFn);
  });
}

/**
 * 弹窗自动置顶
 */
export function modalAutoSetTop() {
  document.addEventListener('mousedown', function (event) {
    const modalEl = queryParentByClass(event.target, 'ant-modal');
    if (!modalEl) {
      return;
    }
    const wrapEl = modalEl.parentNode;
    if (!wrapEl.classList.contains('ele-modal-multiple')) {
      return;
    }
    const wrapperEls = document.querySelectorAll('.ant-modal-wrap');
    let zIndex = Number(getCurrentStyle(wrapEl).zIndex || 1000), newZIndex = zIndex;
    for (let i = 0; i < wrapperEls.length; i++) {
      const index = Number(getCurrentStyle(wrapperEls[i]).zIndex || 1000);
      if (wrapperEls[i] !== wrapEl && index >= newZIndex) {
        newZIndex = index + 1;
      }
    }
    if (newZIndex > zIndex) {
      wrapEl.style.zIndex = String(newZIndex);
    }
  });
}

/**
 * 弹窗支持最大化最小化
 */
export function modalMaximizable() {
  document.addEventListener('click', function (event) {
    const btnEl = event.target.tagName === 'svg' ? event.target.parentNode : event.target;
    if (btnEl.classList.contains('ele-modal-icon-expand')) {
      toggleFullscreen(btnEl, true);
    } else if (btnEl.classList.contains('ele-modal-icon-compress')) {
      toggleFullscreen(btnEl, false);
    }
  });
}

export default {
  install() {
    modalMovable();
    modalResizable();
    modalAutoSetTop();
    modalMaximizable();
  }
}