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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 VisualMapping from '../../visual/VisualMapping';
import * as zrColor from 'zrender/src/tool/color';
import * as zrUtil from 'zrender/src/core/util';

var isArray = zrUtil.isArray;

var ITEM_STYLE_NORMAL = 'itemStyle';

export default {
    seriesType: 'treemap',
    reset: function (seriesModel, ecModel, api, payload) {
        var tree = seriesModel.getData().tree;
        var root = tree.root;

        if (root.isRemoved()) {
            return;
        }

        travelTree(
            root, // Visual should calculate from tree root but not view root.
            {},
            seriesModel.getViewRoot().getAncestors(),
            seriesModel
        );
    }
};

function travelTree(
    node, designatedVisual, viewRootAncestors, seriesModel
) {
    var nodeModel = node.getModel();
    var nodeLayout = node.getLayout();

    // Optimize
    if (!nodeLayout || nodeLayout.invisible || !nodeLayout.isInView) {
        return;
    }

    var nodeItemStyleModel = node.getModel(ITEM_STYLE_NORMAL);
    var visuals = buildVisuals(nodeItemStyleModel, designatedVisual, seriesModel);

    // calculate border color
    var borderColor = nodeItemStyleModel.get('borderColor');
    var borderColorSaturation = nodeItemStyleModel.get('borderColorSaturation');
    var thisNodeColor;
    if (borderColorSaturation != null) {
        // For performance, do not always execute 'calculateColor'.
        thisNodeColor = calculateColor(visuals, node);
        borderColor = calculateBorderColor(borderColorSaturation, thisNodeColor);
    }
    node.setVisual('borderColor', borderColor);

    var viewChildren = node.viewChildren;
    if (!viewChildren || !viewChildren.length) {
        thisNodeColor = calculateColor(visuals, node);
        // Apply visual to this node.
        node.setVisual('color', thisNodeColor);
    }
    else {
        var mapping = buildVisualMapping(
            node, nodeModel, nodeLayout, nodeItemStyleModel, visuals, viewChildren
        );

        // Designate visual to children.
        zrUtil.each(viewChildren, function (child, index) {
            // If higher than viewRoot, only ancestors of viewRoot is needed to visit.
            if (child.depth >= viewRootAncestors.length
                || child === viewRootAncestors[child.depth]
            ) {
                var childVisual = mapVisual(
                    nodeModel, visuals, child, index, mapping, seriesModel
                );
                travelTree(child, childVisual, viewRootAncestors, seriesModel);
            }
        });
    }
}

function buildVisuals(nodeItemStyleModel, designatedVisual, seriesModel) {
    var visuals = zrUtil.extend({}, designatedVisual);
    var designatedVisualItemStyle = seriesModel.designatedVisualItemStyle;

    zrUtil.each(['color', 'colorAlpha', 'colorSaturation'], function (visualName) {
        // Priority: thisNode > thisLevel > parentNodeDesignated > seriesModel
        designatedVisualItemStyle[visualName] = designatedVisual[visualName];
        var val = nodeItemStyleModel.get(visualName);
        designatedVisualItemStyle[visualName] = null;
        val != null && (visuals[visualName] = val);
    });

    return visuals;
}

function calculateColor(visuals) {
    var color = getValueVisualDefine(visuals, 'color');

    if (color) {
        var colorAlpha = getValueVisualDefine(visuals, 'colorAlpha');
        var colorSaturation = getValueVisualDefine(visuals, 'colorSaturation');
        if (colorSaturation) {
            color = zrColor.modifyHSL(color, null, null, colorSaturation);
        }
        if (colorAlpha) {
            color = zrColor.modifyAlpha(color, colorAlpha);
        }

        return color;
    }
}

function calculateBorderColor(borderColorSaturation, thisNodeColor) {
    return thisNodeColor != null
            ? zrColor.modifyHSL(thisNodeColor, null, null, borderColorSaturation)
            : null;
}

function getValueVisualDefine(visuals, name) {
    var value = visuals[name];
    if (value != null && value !== 'none') {
        return value;
    }
}

function buildVisualMapping(
    node, nodeModel, nodeLayout, nodeItemStyleModel, visuals, viewChildren
) {
    if (!viewChildren || !viewChildren.length) {
        return;
    }

    var rangeVisual = getRangeVisual(nodeModel, 'color')
        || (
            visuals.color != null
            && visuals.color !== 'none'
            && (
                getRangeVisual(nodeModel, 'colorAlpha')
                || getRangeVisual(nodeModel, 'colorSaturation')
            )
        );

    if (!rangeVisual) {
        return;
    }

    var visualMin = nodeModel.get('visualMin');
    var visualMax = nodeModel.get('visualMax');
    var dataExtent = nodeLayout.dataExtent.slice();
    visualMin != null && visualMin < dataExtent[0] && (dataExtent[0] = visualMin);
    visualMax != null && visualMax > dataExtent[1] && (dataExtent[1] = visualMax);

    var colorMappingBy = nodeModel.get('colorMappingBy');
    var opt = {
        type: rangeVisual.name,
        dataExtent: dataExtent,
        visual: rangeVisual.range
    };
    if (opt.type === 'color'
        && (colorMappingBy === 'index' || colorMappingBy === 'id')
    ) {
        opt.mappingMethod = 'category';
        opt.loop = true;
        // categories is ordinal, so do not set opt.categories.
    }
    else {
        opt.mappingMethod = 'linear';
    }

    var mapping = new VisualMapping(opt);
    mapping.__drColorMappingBy = colorMappingBy;

    return mapping;
}

// Notice: If we dont have the attribute 'colorRange', but only use
// attribute 'color' to represent both concepts of 'colorRange' and 'color',
// (It means 'colorRange' when 'color' is Array, means 'color' when not array),
// this problem will be encountered:
// If a level-1 node dont have children, and its siblings has children,
// and colorRange is set on level-1, then the node can not be colored.
// So we separate 'colorRange' and 'color' to different attributes.
function getRangeVisual(nodeModel, name) {
    // 'colorRange', 'colorARange', 'colorSRange'.
    // If not exsits on this node, fetch from levels and series.
    var range = nodeModel.get(name);
    return (isArray(range) && range.length) ? {name: name, range: range} : null;
}

function mapVisual(nodeModel, visuals, child, index, mapping, seriesModel) {
    var childVisuals = zrUtil.extend({}, visuals);

    if (mapping) {
        var mappingType = mapping.type;
        var colorMappingBy = mappingType === 'color' && mapping.__drColorMappingBy;
        var value = colorMappingBy === 'index'
            ? index
            : colorMappingBy === 'id'
            ? seriesModel.mapIdToIndex(child.getId())
            : child.getValue(nodeModel.get('visualDimension'));

        childVisuals[mappingType] = mapping.mapValueToVisual(value);
    }

    return childVisuals;
}