const fs = require('fs');
const puppeteer = require('puppeteer');
const path = require('path');
const config = require('./config');
const Component = require('./component');

if (!process.env.OPENSSL_CONF)
    process.env.OPENSSL_CONF = '/etc/ssl/';

class Report extends Component {
    constructor(name, args) {
        super(name);

        this.args = args;
    }

    get path() {
        return `../templates/reports/${this.name}`;
    }

    async toPdfStream() {
        const template = await this.render();
        const defaultOptions = Object.assign({}, config.pdf);

        const optionsPath = `${this.path}/options.json`;
        const fullPath = path.resolve(__dirname, optionsPath);
        let options = defaultOptions;
        if (fs.existsSync(fullPath))
            options = require(optionsPath);

        const browser = await puppeteer.launch({headless: true});
        const page = await browser.newPage();
        await page.setContent(template);

        const element = await page.$('#pageFooter');

        let footer = '\n';
        if (element) {
            footer = await page.evaluate(el => {
                const html = el.innerHTML;
                el.remove();
                return html;
            }, element);
        }

        options.headerTemplate = '\n';
        options.footerTemplate = footer;

        const buffer = await page.pdf(options);
        await browser.close();

        return buffer;
    }
}

module.exports = Report;