// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

var stringifyPrimitive = function (v) {
    switch (typeof v) {
        case 'string':
            return v;

        case 'boolean':
            return v ? 'true' : 'false';

        case 'number':
            return isFinite(v) ? v : '';

        default:
            return '';
    }
};

module.exports = function (obj, sep, eq, name) {
    sep = sep || '&';
    eq = eq || '=';
    if (obj === null) {
        obj = undefined;
    }

    if (typeof obj === 'object') {
        return Object.keys(obj).map(function (k) {
            var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
            if (Array.isArray(obj[k])) {
                return obj[k].map(function (v) {
                    return ks + encodeURIComponent(stringifyPrimitive(v));
                }).join(sep);
            } else {
                return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
            }
        }).filter(Boolean).join(sep);

    }

    if (!name) return '';
    return encodeURIComponent(stringifyPrimitive(name)) + eq +
        encodeURIComponent(stringifyPrimitive(obj));
};