'use strict';

var punycode = require('punycode/');
var revEntities = require('./reversed.json');

module.exports = function encode(str, opts) {
    if (typeof str !== 'string') {
        throw new TypeError('Expected a String');
    }
    if (!opts) { opts = {}; }

    var numeric = true;
    if (opts.named) { numeric = false; }
    if (opts.numeric !== undefined) { numeric = opts.numeric; }

    var special = opts.special || {
        '"': true, "'": true,
        '<': true, '>': true,
        '&': true
    };

    var codePoints = punycode.ucs2.decode(str);
    var chars = [];
    for (var i = 0; i < codePoints.length; i++) {
        var cc = codePoints[i];
        var c = punycode.ucs2.encode([cc]);
        var e = revEntities[cc];
        if (e && (cc >= 127 || special[c]) && !numeric) {
            chars.push('&' + ((/;$/).test(e) ? e : e + ';'));
        } else if (cc < 32 || cc >= 127 || special[c]) {
            chars.push('&#' + cc + ';');
        } else {
            chars.push(c);
        }
    }
    return chars.join('');
};