// Module dependencies
var express = require('express'),
    when = require('when'),
    _ = require('underscore'),
    colors = require("colors"),
    semver = require("semver"),
    errors = require('./server/errorHandling'),
    admin = require('./server/controllers/admin'),
    frontend = require('./server/controllers/frontend'),
    api = require('./server/api'),
    Ghost = require('./ghost'),
    I18n = require('./shared/lang/i18n'),
    helpers = require('./server/helpers'),
    packageInfo = require('../package.json'),

// Variables
    loading = when.defer(),
    server = express(),
    ghost = new Ghost();

// ##Custom Middleware

// ### Auth Middleware
// Authenticate a request by redirecting to login if not logged in.
// We strip /ghost/ out of the redirect parameter for neatness
function auth(req, res, next) {
    if (!req.session.user) {
        var path = req.path.replace(/^\/ghost\/?/gi, ''),
            redirect = '',
            msg;

        if (path !== '') {
            msg = {
                type: 'error',
                message: 'Please Sign In',
                status: 'passive',
                id: 'failedauth'
            };
            // let's only add the notification once
            if (!_.contains(_.pluck(ghost.notifications, 'id'), 'failedauth')) {
                ghost.notifications.push(msg);
            }
            redirect = '?r=' + encodeURIComponent(path);
        }
        return res.redirect('/ghost/signin/' + redirect);
    }

    next();
}


// Check if we're logged in, and if so, redirect people back to dashboard
// Login and signup forms in particular
function redirectToDashboard(req, res, next) {
    if (req.session.user) {
        return res.redirect('/ghost/');
    }

    next();
}

function redirectToSignup(req, res, next) {
    api.users.browse().then(function (users) {
        if (users.length === 0) {
            return res.redirect('/ghost/signup/');
        }
    });

    next();
}

// While we're here, let's clean up on aisle 5
// That being ghost.notifications, and let's remove the passives from there
// plus the local messages, as they have already been added at this point
// otherwise they'd appear one too many times
function cleanNotifications(req, res, next) {
    ghost.notifications = _.reject(ghost.notifications, function (notification) {
        return notification.status === 'passive';
    });
    next();
}

// ## AuthApi Middleware
// Authenticate a request to the API by responding with a 401 and json error details
function authAPI(req, res, next) {
    if (!req.session.user) {
        // TODO: standardize error format/codes/messages
        res.json(401, { error: 'Please sign in' });
        return;
    }

    next();
}

// ### GhostAdmin Middleware
// Uses the URL to detect whether this response should be an admin response
// This is used to ensure the right content is served, and is not for security purposes
function isGhostAdmin(req, res, next) {
    res.isAdmin = /(^\/ghost$|^\/ghost\/)/.test(req.url);

    next();
}

// ### GhostLocals Middleware
// Expose the standard locals that every external page should have available,
// separating between the frontend / theme and the admin
function ghostLocals(req, res, next) {
    // Make sure we have a locals value.
    res.locals = res.locals || {};
    res.locals.version = packageInfo.version;

    if (res.isAdmin) {
        api.users.read({id: req.session.user}).then(function (currentUser) {
            _.extend(res.locals,  {
                // pass the admin flash messages, settings and paths
                messages: ghost.notifications,
                settings: ghost.settings(),
                availableThemes: ghost.paths().availableThemes,
                availablePlugins: ghost.paths().availablePlugins,
                currentUser: {
                    name: currentUser.attributes.name,
                    profile: currentUser.attributes.image
                }
            });
            next();
        }).otherwise(function () {
            _.extend(res.locals,  {
                // pass the admin flash messages, settings and paths
                messages: ghost.notifications,
                settings: ghost.settings(),
                availableThemes: ghost.paths().availableThemes,
                availablePlugins: ghost.paths().availablePlugins
            });
            next();
        });
    } else {
        next();
    }
}

// ### DisableCachedResult Middleware
// Disable any caching until it can be done properly
function disableCachedResult(req, res, next) {
    res.set({
        "Cache-Control": "no-cache, must-revalidate",
        "Expires": "Sat, 26 Jul 1997 05:00:00 GMT"
    });

    next();
}

// Expose the promise we will resolve after our pre-loading
ghost.loaded = loading.promise;

when.all([ghost.init(), helpers.loadCoreHelpers(ghost)]).then(function () {

    // ##Configuration
    server.configure(function () {
        server.use(isGhostAdmin);
        server.use(express.favicon(__dirname + '/shared/favicon.ico'));
        server.use(I18n.load(ghost));
        server.use(express.bodyParser({}));
        server.use(express.bodyParser({uploadDir: __dirname + '/content/images'}));
        server.use(express.cookieParser(ghost.dbHash));
        server.use(express.cookieSession({ cookie: { maxAge: 60000000 }}));
        server.use(ghost.initTheme(server));
        if (process.env.NODE_ENV !== "development") {
            server.use(express.logger());
            server.use(express.errorHandler({ dumpExceptions: false, showStack: false }));
        }
    });

    // Development only configuration
    server.configure("development", function () {
        server.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
        server.use(express.logger('dev'));
    });

    // post init config
    server.use(ghostLocals);
    // So on every request we actually clean out reduntant passive notifications from the server side
    server.use(cleanNotifications);

    // ## Routing

    // ### API routes
    /* TODO: auth should be public auth not user auth */
    // #### Posts
    server.get('/api/v0.1/posts', authAPI, disableCachedResult, api.requestHandler(api.posts.browse));
    server.post('/api/v0.1/posts', authAPI, disableCachedResult, api.requestHandler(api.posts.add));
    server.get('/api/v0.1/posts/:id', authAPI, disableCachedResult, api.requestHandler(api.posts.read));
    server.put('/api/v0.1/posts/:id', authAPI, disableCachedResult, api.requestHandler(api.posts.edit));
    server.del('/api/v0.1/posts/:id', authAPI, disableCachedResult, api.requestHandler(api.posts.destroy));
    // #### Settings
    server.get('/api/v0.1/settings', authAPI, disableCachedResult, api.cachedSettingsRequestHandler(api.settings.browse));
    server.get('/api/v0.1/settings/:key', authAPI, disableCachedResult, api.cachedSettingsRequestHandler(api.settings.read));
    server.put('/api/v0.1/settings', authAPI, disableCachedResult, api.cachedSettingsRequestHandler(api.settings.edit));
    // #### Themes
    server.get('/api/v0.1/themes', authAPI, disableCachedResult, api.requestHandler(api.themes.browse));
    // #### Users
    server.get('/api/v0.1/users', authAPI, disableCachedResult, api.requestHandler(api.users.browse));
    server.get('/api/v0.1/users/:id', authAPI, disableCachedResult, api.requestHandler(api.users.read));
    server.put('/api/v0.1/users/:id', authAPI, disableCachedResult, api.requestHandler(api.users.edit));
    // #### Tags
    server.get('/api/v0.1/tags', authAPI, disableCachedResult, api.requestHandler(api.tags.all));
    // #### Notifications
    server.del('/api/v0.1/notifications/:id', authAPI, disableCachedResult, api.requestHandler(api.notifications.destroy));
    server.post('/api/v0.1/notifications/', authAPI, disableCachedResult, api.requestHandler(api.notifications.add));


    // ### Admin routes
    /* TODO: put these somewhere in admin */
    server.get(/^\/logout\/?$/, function redirect(req, res) {
        res.redirect(301, '/signout/');
    });
    server.get(/^\/signout\/?$/, admin.logout);
    server.get('/ghost/login/', function redirect(req, res) {
        res.redirect(301, '/ghost/signin/');
    });
    server.get('/ghost/signin/', redirectToSignup, redirectToDashboard, admin.login);
    server.get('/ghost/signup/', redirectToDashboard, admin.signup);
    server.get('/ghost/forgotten/', redirectToDashboard, admin.forgotten);
    server.post('/ghost/forgotten/', admin.resetPassword);
    server.post('/ghost/signin/', admin.auth);
    server.post('/ghost/signup/', admin.doRegister);
    server.post('/ghost/changepw/', auth, admin.changepw);
    server.get('/ghost/editor/:id', auth, admin.editor);
    server.get('/ghost/editor', auth, admin.editor);
    server.get('/ghost/content', auth, admin.content);
    server.get('/ghost/settings*', auth, admin.settings);
    server.get('/ghost/debug/', auth, admin.debug.index);
    server.get('/ghost/debug/db/export/', auth, admin.debug['export']);
    server.post('/ghost/debug/db/import/', auth, admin.debug['import']);
    server.get('/ghost/debug/db/reset/', auth, admin.debug.reset);
    server.post('/ghost/upload', admin.uploader);
    server.get(/^\/(ghost$|(ghost-admin|admin|wp-admin|dashboard|signin)\/?)/, auth, function (req, res) {
        res.redirect('/ghost/');
    });
    server.get('/ghost/', redirectToSignup, auth, admin.index);

    // ### Frontend routes
    /* TODO: dynamic routing, homepage generator, filters ETC ETC */
    server.get('/rss/', frontend.rss);
    server.get('/rss/:page/', frontend.rss);
    server.get('/:slug', frontend.single);
    server.get('/', frontend.homepage);
    server.get('/page/:page/', frontend.homepage);


    // ## Start Ghost App
    server.listen(
        ghost.config().server.port,
        ghost.config().server.host,
        function () {

            // Tell users if their node version is not supported, and exit
            if (!semver.satisfies(process.versions.node, packageInfo.engines.node)) {
                console.log(
                    "\nERROR: Unsupported version of Node".red,
                    "\nGhost needs Node version".red,
                    packageInfo.engines.node.yellow,
                    "you are using version".red,
                    process.versions.node.yellow,
                    "\nPlease go to http://nodejs.org to get the latest version".green
                );

                process.exit(0);
            }

            // Startup & Shutdown messages
            if (process.env.NODE_ENV === 'production') {
                console.log(
                    "Ghost is running...".green,
                    "\nYour blog is now available on",
                    ghost.config().url,
                    "\nCtrl+C to shut down".grey
                );

                // ensure that Ghost exits correctly on Ctrl+C
                process.on('SIGINT', function () {
                    console.log(
                        "\nGhost has shut down".red,
                        "\nYour blog is now offline"
                    );
                    process.exit(0);
                });
            } else {
                console.log(
                    "Ghost is running...".green,
                    "\nListening on",
                    ghost.config().server.host + ':' + ghost.config().server.port,
                    "\nUrl configured as:",
                    ghost.config().url,
                    "\nCtrl+C to shut down".grey
                );
                // ensure that Ghost exits correctly on Ctrl+C
                process.on('SIGINT', function () {
                    console.log(
                        "\nGhost has shutdown".red,
                        "\nGhost was running for",
                        Math.round(process.uptime()),
                        "seconds"
                    );
                    process.exit(0);
                });
            }

            // Let everyone know we have finished loading
            loading.resolve();
        }
    );
}, errors.logAndThrowError);