// Load modules

var Utils = require('./utils');


// Declare internals

var internals = {
    delimiter: '&',
    indices: true
};


internals.stringify = function (obj, prefix, options) {

    if (Utils.isBuffer(obj)) {
        obj = obj.toString();
    }
    else if (obj instanceof Date) {
        obj = obj.toISOString();
    }
    else if (obj === null) {
        obj = '';
    }

    if (typeof obj === 'string' ||
        typeof obj === 'number' ||
        typeof obj === 'boolean') {

        return [encodeURIComponent(prefix) + '=' + encodeURIComponent(obj)];
    }

    var values = [];

    if (typeof obj === 'undefined') {
        return values;
    }

    var objKeys = Object.keys(obj);
    for (var i = 0, il = objKeys.length; i < il; ++i) {
        var key = objKeys[i];
        if (!options.indices &&
            Array.isArray(obj)) {

            values = values.concat(internals.stringify(obj[key], prefix, options));
        }
        else {
            values = values.concat(internals.stringify(obj[key], prefix + '[' + key + ']', options));
        }
    }

    return values;
};


module.exports = function (obj, options) {

    options = options || {};
    var delimiter = typeof options.delimiter === 'undefined' ? internals.delimiter : options.delimiter;
    options.indices = typeof options.indices === 'boolean' ? options.indices : internals.indices;

    var keys = [];

    if (typeof obj !== 'object' ||
        obj === null) {

        return '';
    }

    var objKeys = Object.keys(obj);
    for (var i = 0, il = objKeys.length; i < il; ++i) {
        var key = objKeys[i];
        keys = keys.concat(internals.stringify(obj[key], key, options));
    }

    return keys.join(delimiter);
};