const express = require('express');
const fs = require('fs');
const log = require('log');
const pug = require('pug');
const config = require('settings/config');

module.exports = function(app, controllersDir = __dirname + '/../controllers') {

    log.debug("Loading controllers :");
    let templatesToCompile = [];

    let templatesDir = controllersDir + '/../templates';
    fs.readdirSync(templatesDir).forEach((templ) => {
        templatesToCompile.push(templatesDir + '/' + templ);
    });

    fs.readdirSync(controllersDir).forEach(function(name) {

        // views.js in controller, with function as pages (views.py for django)
        let obj = require(controllersDir + '/' + name + '/views');

        // urls.js, just like django urls.py
        let urls = require(controllersDir + '/' + name + '/urls');
        name = obj.name || name;

        let templatesDir = controllersDir + '/' + name + '/templates';
        fs.readdirSync(templatesDir).forEach((templ) => {
            templatesToCompile.push(templatesDir + '/' + templ);
        });

        // allow specifying the view engine
        if (obj.engine) app.set('view engine', obj.engine);

        log.debug('   ' + name + ':');

        for (let url of urls) {

            app[url.method.toLowerCase()](url.url, ((url) => function(req, res, next) {

                let path = obj[url.view](req, res, function(template) {

                    let templatePath = controllersDir + '/' + name + '/templates/' + template;

                    let renderTime = Date.now();
                    res.render(templatePath, res.locals, function(err, out) {
                        log.debug('Template time: ' + (Date.now() - renderTime) + 'ms');
                        if (err !== null) {
                            log.pugerror(err);
                        }
                        res.send(out);
                    });

                }, next);

            })(url));

            log.debug('      ' + url.url + ' -> ' + name + '.' + url.view);
        }

        log.debug();


        // mount the app
        // parent.use(app);

    });

    if (config.DEBUG === false) {
        let time = Date.now();
        log.debug('Compiling templates...');
        for (let template of templatesToCompile) {
            if (template.substr(-4) !== '.txt') {
                pug.compileFile(template, {cache: true});
            }
        }
        log.debug("Templates compiled in " + (Date.now() - time) + 'ms');
    }

}