'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var qs = require('qs');
var routup = require('routup');

function parseRequestQuery(req, options) {
    /* istanbul ignore if  */ if (typeof req.url === 'undefined') {
        return {};
    }
    const url = new URL(req.url, 'http://localhost/');
    let { search } = url;
    if (search.substring(0, 1) === '?') {
        search = search.substring(1);
    }
    return qs.parse(search, options);
}
function isObject(item) {
    return !!item && typeof item === 'object' && !Array.isArray(item);
}

const QuerySymbol = Symbol.for('ReqQuery');
function useRequestQuery(req, key) {
    /* istanbul ignore if  */ if ('query' in req) {
        if (typeof key === 'string') {
            return req.query[key];
        }
        return req.query;
    }
    if (QuerySymbol in req) {
        if (typeof key === 'string') {
            return req[QuerySymbol][key];
        }
        return req[QuerySymbol];
    }
    return typeof key === 'string' ? undefined : {};
}
function hasRequestQuery(req) {
    return QuerySymbol in req && isObject(req[QuerySymbol]) || 'query' in req && isObject(req.query);
}
function setRequestQuery(req, key, value) {
    if (isObject(key)) {
        req[QuerySymbol] = key;
        return;
    }
    req[QuerySymbol] = {
        [key]: value
    };
}

function createHandler(options) {
    return routup.coreHandler((req, res, next)=>{
        if (hasRequestQuery(req)) {
            next();
            return;
        }
        setRequestQuery(req, parseRequestQuery(req, options));
        next();
    });
}

function query(options = {}) {
    return {
        name: 'query',
        install: (router)=>{
            router.use(createHandler(options.parse));
        }
    };
}

Object.defineProperty(exports, "parse", {
    enumerable: true,
    get: function () { return qs.parse; }
});
Object.defineProperty(exports, "stringify", {
    enumerable: true,
    get: function () { return qs.stringify; }
});
exports.createHandler = createHandler;
exports.default = query;
exports.hasRequestQuery = hasRequestQuery;
exports.isObject = isObject;
exports.parseRequestQuery = parseRequestQuery;
exports.query = query;
exports.setRequestQuery = setRequestQuery;
exports.useRequestQuery = useRequestQuery;
module.exports = Object.assign(exports.default, exports);
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