#!/usr/bin/env babel-node

/**
 * @fileoverview
 * Script to validate extension block input placeholders
 */

import fs from 'fs';
import path from 'path';
import async from 'async';
import assert from 'assert';
import locales from '../src/supported-locales.js';

// Globals
const JSON_DIR = path.join(process.cwd(), '/editor/extensions');
const source = JSON.parse(fs.readFileSync(`${JSON_DIR}/en.json`));

// Matches everything inside brackets, and the brackets themselves.
// e.g. matches '[MOTOR_ID]', '[POWER]' from 'altera a potência de [MOTOR_ID] para [POWER]'
const blockInputRegex = /\[.+?\]/g;

let numTotalErrors = 0;

const validateExtensionInputs = (translationData, locale) => {
    let numLocaleErrors = 0;
    for (const block of Object.keys(translationData)) {
        const englishBlockInputs = source[block].match(blockInputRegex);

        if (!englishBlockInputs) continue;

        // If null (meaning no matches), that means that English block inputs exist but translated ones don't.
        // Coerce it to an empty array so that the assertion below fails, instead of getting the less-helpful error
        // that we can't call Array.includes on null.
        const translatedBlockInputs = translationData[block].match(blockInputRegex) || [];

        for (const input of englishBlockInputs) {
            // Currently there are enough errors here that it would be tedious to fix an error, rerun this tool
            // to find the next error, and repeat. So, catch the assertion error and add to the number of total errors.
            // This allows all errors to be displayed when the command is run, rather than just the first encountered.
            try {
                assert(
                    translatedBlockInputs.includes(input),

                    `Block '${block}' in locale '${locale}' does not include input ${input}:\n` +
                    translationData[block]
                );
            } catch (err) {
                numLocaleErrors++;
                console.error(err.message + '\n'); // eslint-disable-line no-console
            }
        }
    }

    if (numLocaleErrors > 0) {
        numTotalErrors += numLocaleErrors;
        throw new Error(`${numLocaleErrors} total error(s) for locale '${locale}'`);
    }
};

const validate = (locale, callback) => {
    fs.readFile(`${JSON_DIR}/${locale}.json`, function (err, data) {
        if (err) callback(err);
        // let this throw an error if invalid json
        data = JSON.parse(data);

        try {
            validateExtensionInputs(data, locale);
        } catch (error) {
            console.error(error.message + '\n'); // eslint-disable-line no-console
        }

        callback();
    });
};

async.each(Object.keys(locales), validate, function (err) {
    if (err) {
        console.error(err); // eslint-disable-line no-console
        process.exit(1);
    }

    if (numTotalErrors > 0) {
        console.error(`${numTotalErrors} total extension input error(s)`); // eslint-disable-line no-console
        process.exit(1);
    }
});