var fs = require('fs');
var path = require('path');
var Sequelize = require('sequelize');
var basename = path.basename(module.filename);
var env = process.env.NODE_ENV || 'development';
var config = require(__dirname + '/../../config').default.db;
var db = {};

if (config.use_env_variable) {
    var sequelize = new Sequelize(process.env[config.use_env_variable]);
} else {
    var sequelize = new Sequelize(config.database, config.username, config.password, config);
}

fs.readdirSync(__dirname)
    .filter(function (file) {
        return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
    })
    .forEach(function (file) {
        var model = sequelize['import'](path.join(__dirname, file));
        db[model.name] = model;
    });

Object.keys(db).forEach(function (modelName) {
    if (db[modelName].associate) {
        db[modelName].associate(db);
    }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

function esc(value, max_length = 256) {
    if (!value) return '';
    if (typeof value === 'number') return value;
    if (typeof value !== 'string') return '(object)';
    let res = value.substring(0, max_length - max_length * 0.2).replace(/[\0\x08\x09\x1a\n\r"'\\\%]/g, function (char) {
        switch (char) {
            case '\0':
                return '\\0';
            case '\x08':
                return '\\b';
            case '\x09':
                return '\\t';
            case '\x1a':
                return '\\z';
            case '\n':
                return '\\n';
            case '\r':
                return '\\r';
            // case '\'':
            // case "'":
            // case '"':
            // case '\\':
            // case '%':
            //     return '\\' + char; // prepends a backslash to backslash, percent, and double/single quotes
        }
        return '-';
    });
    return res.length < max_length ? res : '-';
}

db.esc = esc;

db.escAttrs = function (attrs) {
    const res = {};
    Object.keys(attrs).forEach(key => res[key] = esc(attrs[key]));
    return res;
};

module.exports = db;
