/*
    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.
*/

const fs = require('fs-extra');
const path = require('path');

class ManifestJsonParser {
    constructor (wwwDir) {
        this.path = path.join(wwwDir, 'manifest.json');
        this.www = wwwDir;
        this.manifest = {
            background_color: '#FFF',
            display: 'standalone',
            orientation: 'any',
            start_url: 'index.html'
        };
    }

    configureIcons (config) {
        /**
        * given a tag like this :
        * <icon src="res/ios/icon.png" width="57" height="57" density="mdpi" />
        *
        * configParser returns icons that look like this :
        * {
        *      src: 'res/ios/icon.png',
        *      target: undefined,
        *      density: 'mdpi',
        *      platform: null,
        *      width: 57,
        *      height: 57
        * }
        *
        * manifest expects them to be like this :
        * {
        *      "src": "images/touch/icon-128x128.png",
        *      "type": "image/png",
        *      "sizes": "128x128"
        * }
        */
        const icons = config.getStaticResources(this.platform, 'icon')
            .map((icon) => ({
                src: icon.src,
                type: 'image/png',
                sizes: `${icon.width}x${icon.height}`
            }));

        if (icons.length) this.manifest.icons = icons;

        return this;
    }

    configureOrientation (config) {
        // orientation
        // <preference name="Orientation" value="landscape" />
        const oriPref = config.getGlobalPreference('Orientation');
        if (oriPref === 'landscape' || oriPref === 'portrait') {
            this.manifest.orientation = oriPref;
        }

        return this;
    }

    configureStartUrl (config) {
        // get start_url
        const contentNode = config.doc.find('content');
        if (contentNode) this.manifest.start_url = contentNode.attrib.src;

        return this;
    }

    configureThemeColor (config) {
        if (this.manifest.start_url) {
            const startUrlPath = path.join(this.www, this.manifest.start_url);

            if (fs.existsSync(startUrlPath)) {
                // fetch start url file content and parse for theme-color.
                const contents = fs.readFileSync(startUrlPath, 'utf-8');
                const result = /<meta(?=[^>]*name="theme-color")\s[^>]*content="([^>]*)"/i.exec(contents);

                // If theme-color exists, the value is in index 1.
                if (result && result.length >= 2) this.manifest.theme_color = result[1];
            }
        }

        if (this.manifest.start_url && !this.manifest.theme_color) {
            const themeColor = config.getGlobalPreference('StatusBarBackgroundColor');
            if (themeColor) this.manifest.theme_color = themeColor;
        }

        return this;
    }

    configure (config) {
        if (config) {
            if (config.name()) this.manifest.name = config.name();
            if (config.shortName()) this.manifest.short_name = config.shortName();
            if (config.packageName()) this.manifest.version = config.packageName();
            if (config.description()) this.manifest.description = config.description();
            if (config.author()) this.manifest.author = config.author();

            this.configureIcons(config)
                .configureOrientation(config)
                .configureStartUrl(config)
                .configureThemeColor(config);
        }

        return this;
    }

    write () {
        fs.writeFileSync(this.path, JSON.stringify(this.manifest, null, 2), 'utf8');
    }
}

module.exports = ManifestJsonParser;