var request = require('request');
var fs = require("fs");
var path =require("path");

//TODO
exports.detectFromHTML = function  (options) {};

exports.detectFromUrl = function  (options,cb) {
    
    var url = options.url;

    if (options.debug ) {
        console.log("Fetching the page");
    };

    getHTMLFromUrl(url,function  (err,data) {
        if (err) {
            cb(err,null)
        }else{
            runWrappalyer(options,data, function  (err,detected,appInfo) {
                cb(null,detected,appInfo)
            });
        }
    })
}

function getHTMLFromUrl (url,cb) {
    request(url, function(error, response, body) {
        if (!error && response.statusCode == 200) {
            var data = {
                html: body,
                url: url,
                headers: response
            };
            cb(null,data);
        }else{
            cb(error,null)
        }
    });
}

function getAppsJson(cb) {
    fs.readFile(path.resolve(__dirname, 'apps.json'), 'utf8', function(err, data) {
        if (err) throw err;
        return cb(null, JSON.parse(data))
    });
}

function runWrappalyer(options,data,cb) {
    var debug = options.debug || false;

    var wappalyzer = require("./wappalyzer").wappalyzer;
    getAppsJson(function(err, apps) {
        var w = wappalyzer;
        w.driver = {
            log: function(args) {
                if (debug) {
                    console.log(args.message);
                };
            },

            init: function() {
                w.categories = apps.categories;
                w.apps = apps.apps;
            },
            displayApps: function() {
                var app,url = Object.keys(w.detected)[0];
                var detectedApps = [];
                
                for (app in w.detected[url]) {
                    detectedApps.push(app);

                    if (debug) {
                        console.log(app);
                    };
                };
                cb(null,detectedApps,w.detected[url])
            }
        }
        w.init();
        w.analyze(options.hostname,options.url, data)
    });
}