var isUrlRe = /^(?:https?:)?///i,

url = require('url'),
request,
PromiseConstructor,
AbstractFileManager = require("../less/environment/abstract-file-manager.js"),
logger = require("../less/logger");

var UrlFileManager = function() { };

UrlFileManager.prototype = new AbstractFileManager();

UrlFileManager.prototype.supports = function(filename, currentDirectory, options, environment) {

return isUrlRe.test( filename ) || isUrlRe.test(currentDirectory);

};

UrlFileManager.prototype.loadFile = function(filename, currentDirectory, options, environment) {

if (!PromiseConstructor) {
    PromiseConstructor = typeof Promise === 'undefined' ? require('promise') : Promise;
}
return new PromiseConstructor(function(fulfill, reject) {
    if (request === undefined) {
        try { request = require('request'); }
        catch(e) { request = null; }
    }
    if (!request) {
        reject({ type: 'File', message: "optional dependency 'request' required to import over http(s)\n" });
        return;
    }

    var urlStr = isUrlRe.test( filename ) ? filename : url.resolve(currentDirectory, filename),
        urlObj = url.parse(urlStr);

    if (!urlObj.protocol) {
        urlObj.protocol = "http";
        urlStr = urlObj.format();
    }

    request.get({uri: urlStr, strictSSL: !options.insecure }, function (error, res, body) {
        if (error) {
            reject({ type: 'File', message: "resource '" + urlStr + "' gave this Error:\n  " + error + "\n" });
            return;
        }
        if (res && res.statusCode === 404) {
            reject({ type: 'File', message: "resource '" + urlStr + "' was not found\n" });
            return;
        }
        if (!body) {
            logger.warn('Warning: Empty body (HTTP ' + res.statusCode + ') returned by "' + urlStr + '"');
        }
        fulfill({ contents: body, filename: urlStr });
    });
});

};

module.exports = UrlFileManager;