/**
 * Convert the messages used in Java server side (iso 8859-1 format) to json format (utf-8)
 *
 * Created by rmemoria on 24/8/15.
 */


var fs = require('fs'),
    path = require('path'),
    PP = require('node-properties-parser'),
    Promise = require('bluebird'),
    readline = require('readline');

/**
 * Source and destination folder
 */
var config = {

    // folder where messages_.properties files are
    src: path.join(__dirname, '../../src/main/resources'),

    // folder where messages_.json files will be created
    dest: path.join(__dirname, './')
};


// get the list of all files that start with 'messages_'
var files = fs.readdirSync(config.src).filter( function(fname) {
    return (fname.indexOf("messages_") === 0);
});


console.log('Message files found:');
console.log(files);


new Promise.all( files.map(function(fname) {
    // get the language in the file name
    var lang = fname.replace('messages_', '').split('.').shift();

    var f = path.join(config.src, fname);
    var reader = readline.createInterface({
        input: fs.createReadStream(f)
    });

    // read the file and convert to an object
    return new Promise(function(resolve) {
        var obj = {};

        // read lines of the text file
        reader.on('line', function(line) {
            line = line.trim();
            if (line.length === 0 || line[0] === '#') {
                return;
            }
            // check the separation
            var index = line.indexOf('=');
            var key = line.substring(0, index).trim();
            var msg = line.slice(index + 1).trim();
            if (key) {
                obj[key] = msg;
            }
        });

        // end of file
        reader.on('close', function() {
            resolve(obj);
        });
    })
    .then(function(obj) {
        // receive the object with the keys
        // write the file
        return new Promise(function(resolve, reject) {
            var fdest = path.join(config.dest, 'messages_' + lang + '.json');
            var txt = JSON.stringify(obj, null, 4);
            fs.writeFile(fdest, txt, function(err) {
                if (err) {
                    console.log(err);
                    return reject(err);
                }

                console.log('* Generated ' + fdest);
                resolve();
            });
        });
    })
}))
.then(function() {
    process.exit(0);
})
.catch(function(err) {
    console.log(err);
    process.exit(-1);
});