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'use strict';

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

var formats = require('./formats');

var arrayPrefixGenerators = {

brackets: function brackets(prefix) { // eslint-disable-line func-name-matching

return prefix + '[]';

},

indices: function indices(prefix, key) { // eslint-disable-line func-name-matching

return prefix + '[' + key + ']';

},

repeat: function repeat(prefix) { // eslint-disable-line func-name-matching

return prefix;

}

};

var toISO = Date.prototype.toISOString;

var defaults = {

delimiter: '&',

encode: true,

encoder: utils.encode,

encodeValuesOnly: false,

serializeDate: function serializeDate(date) { // eslint-disable-line func-name-matching

return toISO.call(date);

},

skipNulls: false,

strictNullHandling: false

};

var stringify = function stringify( // eslint-disable-line func-name-matching

object,

prefix,

generateArrayPrefix,

strictNullHandling,

skipNulls,

encoder,

filter,

sort,

allowDots,

serializeDate,

formatter,

encodeValuesOnly

) {

var obj = object;

if (typeof filter === 'function') {

obj = filter(prefix, obj);

} else if (obj instanceof Date) {

obj = serializeDate(obj);

} else if (obj === null) {

if (strictNullHandling) {

return encoder && !encodeValuesOnly ? encoder(prefix) : prefix;

}

obj = '';

}

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

if (encoder) {

var keyValue = encodeValuesOnly ? prefix : encoder(prefix);

return [formatter(keyValue) + '=' + formatter(encoder(obj))];

}

return [formatter(prefix) + '=' + formatter(String(obj))];

}

var values = [];

if (typeof obj === 'undefined') {

return values;

}

var objKeys;

if (Array.isArray(filter)) {

objKeys = filter;

} else {

var keys = Object.keys(obj);

objKeys = sort ? keys.sort(sort) : keys;

}

for (var i = 0; i < objKeys.length; ++i) {

var key = objKeys[i];

if (skipNulls && obj[key] === null) {

continue;

}

if (Array.isArray(obj)) {

values = values.concat(stringify(

obj[key],

generateArrayPrefix(prefix, key),

generateArrayPrefix,

strictNullHandling,

skipNulls,

encoder,

filter,

sort,

allowDots,

serializeDate,

formatter,

encodeValuesOnly

));

} else {

values = values.concat(stringify(

obj[key],

prefix + (allowDots ? '.' + key : '[' + key + ']'),

generateArrayPrefix,

strictNullHandling,

skipNulls,

encoder,

filter,

sort,

allowDots,

serializeDate,

formatter,

encodeValuesOnly

));

}

}

return values;

};

module.exports = function (object, opts) {

var obj = object;

var options = opts || {};

if (options.encoder !== null && options.encoder !== undefined && typeof options.encoder !== 'function') {

throw new TypeError('Encoder has to be a function.');

}

var delimiter = typeof options.delimiter === 'undefined' ? defaults.delimiter : options.delimiter;

var strictNullHandling = typeof options.strictNullHandling === 'boolean' ? options.strictNullHandling : defaults.strictNullHandling;

var skipNulls = typeof options.skipNulls === 'boolean' ? options.skipNulls : defaults.skipNulls;

var encode = typeof options.encode === 'boolean' ? options.encode : defaults.encode;

var encoder = typeof options.encoder === 'function' ? options.encoder : defaults.encoder;

var sort = typeof options.sort === 'function' ? options.sort : null;

var allowDots = typeof options.allowDots === 'undefined' ? false : options.allowDots;

var serializeDate = typeof options.serializeDate === 'function' ? options.serializeDate : defaults.serializeDate;

var encodeValuesOnly = typeof options.encodeValuesOnly === 'boolean' ? options.encodeValuesOnly : defaults.encodeValuesOnly;

if (typeof options.format === 'undefined') {

options.format = formats.default;

} else if (!Object.prototype.hasOwnProperty.call(formats.formatters, options.format)) {

throw new TypeError('Unknown format option provided.');

}

var formatter = formats.formatters[options.format];

var objKeys;

var filter;

if (typeof options.filter === 'function') {

filter = options.filter;

obj = filter('', obj);

} else if (Array.isArray(options.filter)) {

filter = options.filter;

objKeys = filter;

}

var keys = [];

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

return '';

}

var arrayFormat;

if (options.arrayFormat in arrayPrefixGenerators) {

arrayFormat = options.arrayFormat;

} else if ('indices' in options) {

arrayFormat = options.indices ? 'indices' : 'repeat';

} else {

arrayFormat = 'indices';

}

var generateArrayPrefix = arrayPrefixGenerators[arrayFormat];

if (!objKeys) {

objKeys = Object.keys(obj);

}

if (sort) {

objKeys.sort(sort);

}

for (var i = 0; i < objKeys.length; ++i) {

var key = objKeys[i];

if (skipNulls && obj[key] === null) {

continue;

}

keys = keys.concat(stringify(

obj[key],

key,

generateArrayPrefix,

strictNullHandling,

skipNulls,

encode ? encoder : null,

filter,

sort,

allowDots,

serializeDate,

formatter,

encodeValuesOnly

));

}

return keys.join(delimiter);

};