#!/usr/bin/env node

const fs = require('fs');
const glob = require('glob');
const path = require('path');
const mkdirp = require('mkdirp');

var args = process.argv.slice(2);

if (!args.length) {
    process.stdout.write('You must specify the messages dir generated by babel-plugin-react-intl.\n');
    process.exit(1);
}

const MESSAGES_PATTERN = args.shift() + '/**/*.json';

if (!args.length) {
    process.stdout.write('A destination directory must be specified.\n');
    process.exit(1);
}

const LANG_DIR = args.shift();

// Aggregates the default messages that were extracted from the example app's
// React components via the React Intl Babel plugin. An error will be thrown if
// there are messages in different components that use the same `id`. The result
// is a chromei18n format collection of `id: {message: defaultMessage,
// description: description}` pairs for the app's default locale.
let defaultMessages = glob.sync(MESSAGES_PATTERN)
    .map((filename) => fs.readFileSync(filename, 'utf8'))
    .map((file) => JSON.parse(file))
    .reduce((collection, descriptors) => {
        descriptors.forEach(({id, defaultMessage, description}) => {
            if (collection.hasOwnProperty(id)) {
                throw new Error(`Duplicate message id: ${id}`);
            }

            collection[id] = {message: defaultMessage, description: description};
        });

        return collection;
    }, {});

mkdirp.sync(LANG_DIR);
fs.writeFileSync(path.join(LANG_DIR, 'en.json'), JSON.stringify(defaultMessages, null, 2));