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

const devPort = process.env.PORT || config.dev.port;

const {
    interval
} = require('rxjs');
const {
    filter,
    first,
    mergeMap
} = require('rxjs/operators');

const fetchResponse = () => {
    return new Promise((res, rej) => {
        try {
            const req = http.request(`http://localhost:${devPort}/#/`, response => res(response.statusCode));
            req.on('error', (err) => rej(err));
            req.end();
        } catch (err) {
            rej(err);
        }
    });
};

const waitForServerReachable = () => {
    return interval(1000).pipe(
        mergeMap(async () => {
            try {
                const statusCode = await fetchResponse();
                if (statusCode === 200) return true;
            } catch (err) {}
            return false;
        }),
        filter(ok => !!ok)
    );
};
/*
const timedOut = timeout => {
    return new Promise(res => {
        setTimeout(res, timeout);
    });
};
*/
const convert = async () => {
    await waitForServerReachable().pipe(
        first()
    ).toPromise();

    console.log('Connected to server ...');
    console.log('Exporting ...');
    try {
        const fullDirectoryPath = path.join(__dirname, '../pdf/');
        let directories = getResumesFromDirectories();
        const resumeFilterRaw = (process.env.EXPORT_RESUME || process.argv[2] || '').trim();
        const resumeFilter = resumeFilterRaw.replace(/\.vue$/i, '').toLowerCase();
        if (resumeFilter) {
            directories = directories.filter(d => d.name.toLowerCase() === resumeFilter);
            if (directories.length === 0) {
                console.error(
                    `No resume template "${resumeFilterRaw}". Expected a name like "green" (see src/resumes/*.vue).`
                );
                process.exit(1);
            }
            console.log('Resume filter: ' + directories.map(d => d.name).join(', '));
        }
        for (const dir of directories) {
            const browser = await puppeteer.launch({
                headless: true,
                args: ['--no-sandbox', '--font-render-hinting=none']
            });
            const page = await browser.newPage();
            await page.goto(`http://localhost:${devPort}/#/resume/` + dir.name, {
                waitUntil: 'load',
                timeout: 120000
            });
            try {
                await page.evaluate(() => document.fonts.ready);
            } catch (_err) {
                /* ignore if fonts API missing */
            }
            await new Promise((r) => setTimeout(r, 300));

            if (
                !fs.existsSync(fullDirectoryPath)
            ) {
                fs.mkdirSync(fullDirectoryPath);
            }
            await page.pdf({
                path: fullDirectoryPath + dir.name + '.pdf',
                format: 'A4',
                printBackground: true
            });
            await browser.close();
        }
    } catch (err) {
        throw new Error(err);
    }
    console.log('Finished exports.');
};

const getResumesFromDirectories = () => {
    const directories = getDirectories();
    return directories
    .map(dir => {
        const fileName = dir.replace('.vue', '');
        return {
            path: fileName,
            name: fileName
        };
    });
};

const getDirectories = () => {
    const srcpath = path.join(__dirname, '../src/resumes');
    return fs.readdirSync(srcpath)
    .filter(file => file !== 'resumes.js' && file !== 'template.vue' && file !== 'options.js');
};

convert();