/*************************************************************
 *
 *  Copyright (c) 2017 The MathJax Consortium
 *
 *  Licensed 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.
 */

/**
 * @fileoverview  Implements the CHTMLmath wrapper for the MmlMath object
 *
 * @author dpvc@mathjax.org (Davide Cervone)
 */

import {CHTMLWrapper, CHTMLConstructor} from '../Wrapper.js';
import {CHTMLWrapperFactory} from '../WrapperFactory.js';
import {CommonMath, CommonMathMixin} from '../../common/Wrappers/math.js';
import {MmlMath} from '../../../core/MmlTree/MmlNodes/math.js';
import {MmlNode} from '../../../core/MmlTree/MmlNode.js';
import {StyleList} from '../../common/CssStyles.js';

/*****************************************************************/
/**
 * The CHTMLmath wrapper for the MmlMath object
 *
 * @template N  The HTMLElement node class
 * @template T  The Text node class
 * @template D  The Document class
 */
export class CHTMLmath<N, T, D> extends CommonMathMixin<CHTMLConstructor<N, T, D>>(CHTMLWrapper) {
    public static kind = MmlMath.prototype.kind;

    public static styles: StyleList = {
        'mjx-math': {
            'line-height': 0,
            'text-align': 'left',
            'text-indent': 0,
            'font-style': 'normal',
            'font-weight': 'normal',
            'font-size': '100%',
            'font-size-adjust': 'none',
            'letter-spacing': 'normal',
            'word-wrap': 'normal',
            'word-spacing': 'normal',
            'white-space': 'nowrap',
            'direction': 'ltr',
            'padding': '1px 0'
        },
        'mjx-container[jax="CHTML"][display="true"]': {
            display: 'block',
            'text-align': 'center',
            margin: '1em 0'
        },
        'mjx-container[jax="CHTML"][display="true"] mjx-math': {
            padding: 0
        },
        'mjx-container[jax="CHTML"][justify="left"]': {
            'text-align': 'left'
        },
        'mjx-container[jax="CHTML"][justify="right"]': {
            'text-align': 'right'
        }
    };

    /**
     * @override
     */
    public toCHTML(parent: N) {
        super.toCHTML(parent);
        const chtml = this.chtml;
        const adaptor = this.adaptor;
        const attributes = this.node.attributes;
        const display = (attributes.get('display') === 'block');
        if (display) {
            adaptor.setAttribute(chtml, 'display', 'true');
            adaptor.setAttribute(parent, 'display', 'true');
        } else {
            //
            // Transfer right margin to container (for things like $x\hskip -2em y$)
            //
            const margin = adaptor.getStyle(chtml, 'margin-right');
            if (margin) {
                adaptor.setStyle(chtml, 'margin-right', '');
                adaptor.setStyle(parent, 'margin-right', margin);
                adaptor.setStyle(parent, 'width', '0');
            }
        }
        adaptor.addClass(chtml, 'MJX-TEX');
        const [align, shift] = this.getAlignShift();
        if (align !== 'center') {
            adaptor.setAttribute(parent, 'justify', align);
        }
        if (display && shift && !adaptor.hasAttribute(chtml, 'width')) {
            this.setIndent(chtml, align, shift);
        }
        //
        // Transfer speech to aria-label and hide child nodes
        //
        const speech = attributes.get('data-semantic-speech') as string;
        if (speech && !attributes.get('aria-label')) {
            adaptor.setAttribute(this.chtml, 'aria-label', speech);
            if (attributes.get('data-semantic-speech')) {
                for (const child of this.childNodes[0].childNodes) {
                    adaptor.setAttribute(child.chtml, 'aria-hidden', 'true');
                }
            }
        }
    }

    /**
     * @override
     */
    public setChildPWidths(recompute: boolean, w: number = null, clear: boolean = true) {
        return (this.parent ? super.setChildPWidths(recompute, w) : false);
    }

}