const fs = require('fs/promises');
const path = require('path');
const glob = require('glob');

// Globals
const PATH_INPUT = path.resolve(__dirname, '../msg/json/en.json');
// If you want to generate js files for other languages, comment out the line above,
// and use the one below instead.
// const PATH_INPUT = path.resolve(__dirname, '../msg/json/*.json');
const PATH_OUTPUT = path.resolve(__dirname, '../msg/js');

// Processing task
const work = async function (uri) {
    let body = await fs.readFile(uri);
    const name = path.parse(uri).name;

    // Convert file body into an object (let this throw if invalid JSON)
    body = JSON.parse(body);

    // File storage object and preamble
    let file = '';
    file += '// This file was automatically generated.  Do not modify.\n';
    file += '\n';
    file += '\'use strict\';\n';
    file += '\n';
    file += `goog.provide(\'Blockly.Msg.${name}\');\n`;
    file += 'goog.require(\'Blockly.Msg\');\n';
    file += '\n';

    // Iterate over object and build up file
    for (let i in body) {
        file += `Blockly.Msg["${i}"] = "${body[i].replace(/"/g, '\\"')}";\n`
    }

    // Write file to disk
    await fs.writeFile(`${PATH_OUTPUT}/${name}.js`, file);
};

// Create async processing queue
(async function() {
    const uris = glob.sync(PATH_INPUT);
    for (const uri of uris) {
        await work(uri);
    }
})();