/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

var zrUtil = require("zrender/lib/core/util");

var graphic = require("../../util/graphic");

var layoutUtil = require("../../util/layout");

var LegendView = require("./LegendView");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

/**
 * Separate legend and scrollable legend to reduce package size.
 */
var Group = graphic.Group;
var WH = ['width', 'height'];
var XY = ['x', 'y'];
var ScrollableLegendView = LegendView.extend({
  type: 'legend.scroll',
  newlineDisabled: true,
  init: function () {
    ScrollableLegendView.superCall(this, 'init');
    /**
     * @private
     * @type {number} For `scroll`.
     */

    this._currentIndex = 0;
    /**
     * @private
     * @type {module:zrender/container/Group}
     */

    this.group.add(this._containerGroup = new Group());

    this._containerGroup.add(this.getContentGroup());
    /**
     * @private
     * @type {module:zrender/container/Group}
     */


    this.group.add(this._controllerGroup = new Group());
    /**
     *
     * @private
     */

    this._showController;
  },

  /**
   * @override
   */
  resetInner: function () {
    ScrollableLegendView.superCall(this, 'resetInner');

    this._controllerGroup.removeAll();

    this._containerGroup.removeClipPath();

    this._containerGroup.__rectSize = null;
  },

  /**
   * @override
   */
  renderInner: function (itemAlign, legendModel, ecModel, api, selector, orient, selectorPosition) {
    var me = this; // Render content items.

    ScrollableLegendView.superCall(this, 'renderInner', itemAlign, legendModel, ecModel, api, selector, orient, selectorPosition);
    var controllerGroup = this._controllerGroup; // FIXME: support be 'auto' adapt to size number text length,
    // e.g., '3/12345' should not overlap with the control arrow button.

    var pageIconSize = legendModel.get('pageIconSize', true);

    if (!zrUtil.isArray(pageIconSize)) {
      pageIconSize = [pageIconSize, pageIconSize];
    }

    createPageButton('pagePrev', 0);
    var pageTextStyleModel = legendModel.getModel('pageTextStyle');
    controllerGroup.add(new graphic.Text({
      name: 'pageText',
      style: {
        textFill: pageTextStyleModel.getTextColor(),
        font: pageTextStyleModel.getFont(),
        textVerticalAlign: 'middle',
        textAlign: 'center'
      },
      silent: true
    }));
    createPageButton('pageNext', 1);

    function createPageButton(name, iconIdx) {
      var pageDataIndexName = name + 'DataIndex';
      var icon = graphic.createIcon(legendModel.get('pageIcons', true)[legendModel.getOrient().name][iconIdx], {
        // Buttons will be created in each render, so we do not need
        // to worry about avoiding using legendModel kept in scope.
        onclick: zrUtil.bind(me._pageGo, me, pageDataIndexName, legendModel, api)
      }, {
        x: -pageIconSize[0] / 2,
        y: -pageIconSize[1] / 2,
        width: pageIconSize[0],
        height: pageIconSize[1]
      });
      icon.name = name;
      controllerGroup.add(icon);
    }
  },

  /**
   * @override
   */
  layoutInner: function (legendModel, itemAlign, maxSize, isFirstRender, selector, selectorPosition) {
    var selectorGroup = this.getSelectorGroup();
    var orientIdx = legendModel.getOrient().index;
    var wh = WH[orientIdx];
    var xy = XY[orientIdx];
    var hw = WH[1 - orientIdx];
    var yx = XY[1 - orientIdx];
    selector && layoutUtil.box( // Buttons in selectorGroup always layout horizontally
    'horizontal', selectorGroup, legendModel.get('selectorItemGap', true));
    var selectorButtonGap = legendModel.get('selectorButtonGap', true);
    var selectorRect = selectorGroup.getBoundingRect();
    var selectorPos = [-selectorRect.x, -selectorRect.y];
    var processMaxSize = zrUtil.clone(maxSize);
    selector && (processMaxSize[wh] = maxSize[wh] - selectorRect[wh] - selectorButtonGap);

    var mainRect = this._layoutContentAndController(legendModel, isFirstRender, processMaxSize, orientIdx, wh, hw, yx);

    if (selector) {
      if (selectorPosition === 'end') {
        selectorPos[orientIdx] += mainRect[wh] + selectorButtonGap;
      } else {
        var offset = selectorRect[wh] + selectorButtonGap;
        selectorPos[orientIdx] -= offset;
        mainRect[xy] -= offset;
      }

      mainRect[wh] += selectorRect[wh] + selectorButtonGap;
      selectorPos[1 - orientIdx] += mainRect[yx] + mainRect[hw] / 2 - selectorRect[hw] / 2;
      mainRect[hw] = Math.max(mainRect[hw], selectorRect[hw]);
      mainRect[yx] = Math.min(mainRect[yx], selectorRect[yx] + selectorPos[1 - orientIdx]);
      selectorGroup.attr('position', selectorPos);
    }

    return mainRect;
  },
  _layoutContentAndController: function (legendModel, isFirstRender, maxSize, orientIdx, wh, hw, yx) {
    var contentGroup = this.getContentGroup();
    var containerGroup = this._containerGroup;
    var controllerGroup = this._controllerGroup; // Place items in contentGroup.

    layoutUtil.box(legendModel.get('orient'), contentGroup, legendModel.get('itemGap'), !orientIdx ? null : maxSize.width, orientIdx ? null : maxSize.height);
    layoutUtil.box( // Buttons in controller are layout always horizontally.
    'horizontal', controllerGroup, legendModel.get('pageButtonItemGap', true));
    var contentRect = contentGroup.getBoundingRect();
    var controllerRect = controllerGroup.getBoundingRect();
    var showController = this._showController = contentRect[wh] > maxSize[wh];
    var contentPos = [-contentRect.x, -contentRect.y]; // Remain contentPos when scroll animation perfroming.
    // If first rendering, `contentGroup.position` is [0, 0], which
    // does not make sense and may cause unexepcted animation if adopted.

    if (!isFirstRender) {
      contentPos[orientIdx] = contentGroup.position[orientIdx];
    } // Layout container group based on 0.


    var containerPos = [0, 0];
    var controllerPos = [-controllerRect.x, -controllerRect.y];
    var pageButtonGap = zrUtil.retrieve2(legendModel.get('pageButtonGap', true), legendModel.get('itemGap', true)); // Place containerGroup and controllerGroup and contentGroup.

    if (showController) {
      var pageButtonPosition = legendModel.get('pageButtonPosition', true); // controller is on the right / bottom.

      if (pageButtonPosition === 'end') {
        controllerPos[orientIdx] += maxSize[wh] - controllerRect[wh];
      } // controller is on the left / top.
      else {
          containerPos[orientIdx] += controllerRect[wh] + pageButtonGap;
        }
    } // Always align controller to content as 'middle'.


    controllerPos[1 - orientIdx] += contentRect[hw] / 2 - controllerRect[hw] / 2;
    contentGroup.attr('position', contentPos);
    containerGroup.attr('position', containerPos);
    controllerGroup.attr('position', controllerPos); // Calculate `mainRect` and set `clipPath`.
    // mainRect should not be calculated by `this.group.getBoundingRect()`
    // for sake of the overflow.

    var mainRect = {
      x: 0,
      y: 0
    }; // Consider content may be overflow (should be clipped).

    mainRect[wh] = showController ? maxSize[wh] : contentRect[wh];
    mainRect[hw] = Math.max(contentRect[hw], controllerRect[hw]); // `containerRect[yx] + containerPos[1 - orientIdx]` is 0.

    mainRect[yx] = Math.min(0, controllerRect[yx] + controllerPos[1 - orientIdx]);
    containerGroup.__rectSize = maxSize[wh];

    if (showController) {
      var clipShape = {
        x: 0,
        y: 0
      };
      clipShape[wh] = Math.max(maxSize[wh] - controllerRect[wh] - pageButtonGap, 0);
      clipShape[hw] = mainRect[hw];
      containerGroup.setClipPath(new graphic.Rect({
        shape: clipShape
      })); // Consider content may be larger than container, container rect
      // can not be obtained from `containerGroup.getBoundingRect()`.

      containerGroup.__rectSize = clipShape[wh];
    } else {
      // Do not remove or ignore controller. Keep them set as placeholders.
      controllerGroup.eachChild(function (child) {
        child.attr({
          invisible: true,
          silent: true
        });
      });
    } // Content translate animation.


    var pageInfo = this._getPageInfo(legendModel);

    pageInfo.pageIndex != null && graphic.updateProps(contentGroup, {
      position: pageInfo.contentPosition
    }, // When switch from "show controller" to "not show controller", view should be
    // updated immediately without animation, otherwise causes weird effect.
    showController ? legendModel : false);

    this._updatePageInfoView(legendModel, pageInfo);

    return mainRect;
  },
  _pageGo: function (to, legendModel, api) {
    var scrollDataIndex = this._getPageInfo(legendModel)[to];

    scrollDataIndex != null && api.dispatchAction({
      type: 'legendScroll',
      scrollDataIndex: scrollDataIndex,
      legendId: legendModel.id
    });
  },
  _updatePageInfoView: function (legendModel, pageInfo) {
    var controllerGroup = this._controllerGroup;
    zrUtil.each(['pagePrev', 'pageNext'], function (name) {
      var canJump = pageInfo[name + 'DataIndex'] != null;
      var icon = controllerGroup.childOfName(name);

      if (icon) {
        icon.setStyle('fill', canJump ? legendModel.get('pageIconColor', true) : legendModel.get('pageIconInactiveColor', true));
        icon.cursor = canJump ? 'pointer' : 'default';
      }
    });
    var pageText = controllerGroup.childOfName('pageText');
    var pageFormatter = legendModel.get('pageFormatter');
    var pageIndex = pageInfo.pageIndex;
    var current = pageIndex != null ? pageIndex + 1 : 0;
    var total = pageInfo.pageCount;
    pageText && pageFormatter && pageText.setStyle('text', zrUtil.isString(pageFormatter) ? pageFormatter.replace('{current}', current).replace('{total}', total) : pageFormatter({
      current: current,
      total: total
    }));
  },

  /**
   * @param {module:echarts/model/Model} legendModel
   * @return {Object} {
   *  contentPosition: Array.<number>, null when data item not found.
   *  pageIndex: number, null when data item not found.
   *  pageCount: number, always be a number, can be 0.
   *  pagePrevDataIndex: number, null when no previous page.
   *  pageNextDataIndex: number, null when no next page.
   * }
   */
  _getPageInfo: function (legendModel) {
    var scrollDataIndex = legendModel.get('scrollDataIndex', true);
    var contentGroup = this.getContentGroup();
    var containerRectSize = this._containerGroup.__rectSize;
    var orientIdx = legendModel.getOrient().index;
    var wh = WH[orientIdx];
    var xy = XY[orientIdx];

    var targetItemIndex = this._findTargetItemIndex(scrollDataIndex);

    var children = contentGroup.children();
    var targetItem = children[targetItemIndex];
    var itemCount = children.length;
    var pCount = !itemCount ? 0 : 1;
    var result = {
      contentPosition: contentGroup.position.slice(),
      pageCount: pCount,
      pageIndex: pCount - 1,
      pagePrevDataIndex: null,
      pageNextDataIndex: null
    };

    if (!targetItem) {
      return result;
    }

    var targetItemInfo = getItemInfo(targetItem);
    result.contentPosition[orientIdx] = -targetItemInfo.s; // Strategy:
    // (1) Always align based on the left/top most item.
    // (2) It is user-friendly that the last item shown in the
    // current window is shown at the begining of next window.
    // Otherwise if half of the last item is cut by the window,
    // it will have no chance to display entirely.
    // (3) Consider that item size probably be different, we
    // have calculate pageIndex by size rather than item index,
    // and we can not get page index directly by division.
    // (4) The window is to narrow to contain more than
    // one item, we should make sure that the page can be fliped.

    for (var i = targetItemIndex + 1, winStartItemInfo = targetItemInfo, winEndItemInfo = targetItemInfo, currItemInfo = null; i <= itemCount; ++i) {
      currItemInfo = getItemInfo(children[i]);

      if ( // Half of the last item is out of the window.
      !currItemInfo && winEndItemInfo.e > winStartItemInfo.s + containerRectSize || // If the current item does not intersect with the window, the new page
      // can be started at the current item or the last item.
      currItemInfo && !intersect(currItemInfo, winStartItemInfo.s)) {
        if (winEndItemInfo.i > winStartItemInfo.i) {
          winStartItemInfo = winEndItemInfo;
        } else {
          // e.g., when page size is smaller than item size.
          winStartItemInfo = currItemInfo;
        }

        if (winStartItemInfo) {
          if (result.pageNextDataIndex == null) {
            result.pageNextDataIndex = winStartItemInfo.i;
          }

          ++result.pageCount;
        }
      }

      winEndItemInfo = currItemInfo;
    }

    for (var i = targetItemIndex - 1, winStartItemInfo = targetItemInfo, winEndItemInfo = targetItemInfo, currItemInfo = null; i >= -1; --i) {
      currItemInfo = getItemInfo(children[i]);

      if ( // If the the end item does not intersect with the window started
      // from the current item, a page can be settled.
      (!currItemInfo || !intersect(winEndItemInfo, currItemInfo.s)) && // e.g., when page size is smaller than item size.
      winStartItemInfo.i < winEndItemInfo.i) {
        winEndItemInfo = winStartItemInfo;

        if (result.pagePrevDataIndex == null) {
          result.pagePrevDataIndex = winStartItemInfo.i;
        }

        ++result.pageCount;
        ++result.pageIndex;
      }

      winStartItemInfo = currItemInfo;
    }

    return result;

    function getItemInfo(el) {
      if (el) {
        var itemRect = el.getBoundingRect();
        var start = itemRect[xy] + el.position[orientIdx];
        return {
          s: start,
          e: start + itemRect[wh],
          i: el.__legendDataIndex
        };
      }
    }

    function intersect(itemInfo, winStart) {
      return itemInfo.e >= winStart && itemInfo.s <= winStart + containerRectSize;
    }
  },
  _findTargetItemIndex: function (targetDataIndex) {
    if (!this._showController) {
      return 0;
    }

    var index;
    var contentGroup = this.getContentGroup();
    var defaultIndex;
    contentGroup.eachChild(function (child, idx) {
      var legendDataIdx = child.__legendDataIndex; // FIXME
      // If the given targetDataIndex (from model) is illegal,
      // we use defaultIndex. But the index on the legend model and
      // action payload is still illegal. That case will not be
      // changed until some scenario requires.

      if (defaultIndex == null && legendDataIdx != null) {
        defaultIndex = idx;
      }

      if (legendDataIdx === targetDataIndex) {
        index = idx;
      }
    });
    return index != null ? index : defaultIndex;
  }
});
var _default = ScrollableLegendView;
module.exports = _default;