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/*
* 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.
*/

import * as zrUtil from 'zrender/src/core/util';
import VisualMapView from './VisualMapView';
import * as graphic from '../../util/graphic';
import {createSymbol} from '../../util/symbol';
import * as layout from '../../util/layout';
import * as helper from './helper';

var PiecewiseVisualMapView = VisualMapView.extend({

    type: 'visualMap.piecewise',

    /**
     * @protected
     * @override
     */
    doRender: function () {
        var thisGroup = this.group;

        thisGroup.removeAll();

        var visualMapModel = this.visualMapModel;
        var textGap = visualMapModel.get('textGap');
        var textStyleModel = visualMapModel.textStyleModel;
        var textFont = textStyleModel.getFont();
        var textFill = textStyleModel.getTextColor();
        var itemAlign = this._getItemAlign();
        var itemSize = visualMapModel.itemSize;
        var viewData = this._getViewData();
        var endsText = viewData.endsText;
        var showLabel = zrUtil.retrieve(visualMapModel.get('showLabel', true), !endsText);

        endsText && this._renderEndsText(
            thisGroup, endsText[0], itemSize, showLabel, itemAlign
        );

        zrUtil.each(viewData.viewPieceList, renderItem, this);

        endsText && this._renderEndsText(
            thisGroup, endsText[1], itemSize, showLabel, itemAlign
        );

        layout.box(
            visualMapModel.get('orient'), thisGroup, visualMapModel.get('itemGap')
        );

        this.renderBackground(thisGroup);

        this.positionGroup(thisGroup);

        function renderItem(item) {
            var piece = item.piece;

            var itemGroup = new graphic.Group();
            itemGroup.onclick = zrUtil.bind(this._onItemClick, this, piece);

            this._enableHoverLink(itemGroup, item.indexInModelPieceList);

            var representValue = visualMapModel.getRepresentValue(piece);

            this._createItemSymbol(
                itemGroup, representValue, [0, 0, itemSize[0], itemSize[1]]
            );

            if (showLabel) {
                var visualState = this.visualMapModel.getValueState(representValue);

                itemGroup.add(new graphic.Text({
                    style: {
                        x: itemAlign === 'right' ? -textGap : itemSize[0] + textGap,
                        y: itemSize[1] / 2,
                        text: piece.text,
                        textVerticalAlign: 'middle',
                        textAlign: itemAlign,
                        textFont: textFont,
                        textFill: textFill,
                        opacity: visualState === 'outOfRange' ? 0.5 : 1
                    }
                }));
            }

            thisGroup.add(itemGroup);
        }
    },

    /**
     * @private
     */
    _enableHoverLink: function (itemGroup, pieceIndex) {
        itemGroup
            .on('mouseover', zrUtil.bind(onHoverLink, this, 'highlight'))
            .on('mouseout', zrUtil.bind(onHoverLink, this, 'downplay'));

        function onHoverLink(method) {
            var visualMapModel = this.visualMapModel;

            visualMapModel.option.hoverLink && this.api.dispatchAction({
                type: method,
                batch: helper.makeHighDownBatch(
                    visualMapModel.findTargetDataIndices(pieceIndex),
                    visualMapModel
                )
            });
        }
    },

    /**
     * @private
     */
    _getItemAlign: function () {
        var visualMapModel = this.visualMapModel;
        var modelOption = visualMapModel.option;

        if (modelOption.orient === 'vertical') {
            return helper.getItemAlign(
                visualMapModel, this.api, visualMapModel.itemSize
            );
        }
        else { // horizontal, most case left unless specifying right.
            var align = modelOption.align;
            if (!align || align === 'auto') {
                align = 'left';
            }
            return align;
        }
    },

    /**
     * @private
     */
    _renderEndsText: function (group, text, itemSize, showLabel, itemAlign) {
        if (!text) {
            return;
        }

        var itemGroup = new graphic.Group();
        var textStyleModel = this.visualMapModel.textStyleModel;

        itemGroup.add(new graphic.Text({
            style: {
                x: showLabel ? (itemAlign === 'right' ? itemSize[0] : 0) : itemSize[0] / 2,
                y: itemSize[1] / 2,
                textVerticalAlign: 'middle',
                textAlign: showLabel ? itemAlign : 'center',
                text: text,
                textFont: textStyleModel.getFont(),
                textFill: textStyleModel.getTextColor()
            }
        }));

        group.add(itemGroup);
    },

    /**
     * @private
     * @return {Object} {peiceList, endsText} The order is the same as screen pixel order.
     */
    _getViewData: function () {
        var visualMapModel = this.visualMapModel;

        var viewPieceList = zrUtil.map(visualMapModel.getPieceList(), function (piece, index) {
            return {piece: piece, indexInModelPieceList: index};
        });
        var endsText = visualMapModel.get('text');

        // Consider orient and inverse.
        var orient = visualMapModel.get('orient');
        var inverse = visualMapModel.get('inverse');

        // Order of model pieceList is always [low, ..., high]
        if (orient === 'horizontal' ? inverse : !inverse) {
            viewPieceList.reverse();
        }
        // Origin order of endsText is [high, low]
        else if (endsText) {
            endsText = endsText.slice().reverse();
        }

        return {viewPieceList: viewPieceList, endsText: endsText};
    },

    /**
     * @private
     */
    _createItemSymbol: function (group, representValue, shapeParam) {
        group.add(createSymbol(
            this.getControllerVisual(representValue, 'symbol'),
            shapeParam[0], shapeParam[1], shapeParam[2], shapeParam[3],
            this.getControllerVisual(representValue, 'color')
        ));
    },

    /**
     * @private
     */
    _onItemClick: function (piece) {
        var visualMapModel = this.visualMapModel;
        var option = visualMapModel.option;
        var selected = zrUtil.clone(option.selected);
        var newKey = visualMapModel.getSelectedMapKey(piece);

        if (option.selectedMode === 'single') {
            selected[newKey] = true;
            zrUtil.each(selected, function (o, key) {
                selected[key] = key === newKey;
            });
        }
        else {
            selected[newKey] = !selected[newKey];
        }

        this.api.dispatchAction({
            type: 'selectDataRange',
            from: this.uid,
            visualMapId: this.visualMapModel.id,
            selected: selected
        });
    }
});

export default PiecewiseVisualMapView;