var config        = require('../config'),
    _             = require('lodash'),
    path          = require('path'),
    when          = require('when'),
    api           = require('../api'),
    mailer        = require('../mail'),
    errors        = require('../errorHandling'),
    storage       = require('../storage'),
    updateCheck   = require('../update-check'),

    adminNavbar,
    adminControllers,
    loginSecurity = [];

adminNavbar = {
    content: {
        name: 'Content',
        navClass: 'content',
        key: 'admin.navbar.content',
        path: '/'
    },
    add: {
        name: 'New Post',
        navClass: 'editor',
        key: 'admin.navbar.editor',
        path: '/editor/'
    },
    settings: {
        name: 'Settings',
        navClass: 'settings',
        key: 'admin.navbar.settings',
        path: '/settings/'
    }
};


// TODO: make this a util or helper
function setSelected(list, name) {
    _.each(list, function (item, key) {
        item.selected = key === name;
    });
    return list;
}

adminControllers = {
    // Route: index
    // Path: /ghost/
    // Method: GET
    'index': function (req, res) {
        /*jslint unparam:true*/
        function renderIndex() {
            res.render('content', {
                bodyClass: 'manage',
                adminNav: setSelected(adminNavbar, 'content')
            });
        }

        when.join(
            updateCheck(res),
            when(renderIndex())
            // an error here should just get logged
        ).otherwise(errors.logError);
    },
    'content': function (req, res) {
        /*jslint unparam:true*/
        res.render('content', {
            bodyClass: 'manage',
            adminNav: setSelected(adminNavbar, 'content')
        });
    },
    // Route: editor
    // Path: /ghost/editor(/:id)?/
    // Method: GET
    'editor': function (req, res) {
        if (req.params.id !== undefined) {
            res.render('editor', {
                bodyClass: 'editor',
                adminNav: setSelected(adminNavbar, 'content')
            });
        } else {
            res.render('editor', {
                bodyClass: 'editor',
                adminNav: setSelected(adminNavbar, 'add')
            });
        }
    },
    // Route: settings
    // path: /ghost/settings/(*/)?
    // Method: GET
    'settings': function (req, res, next) {
        // TODO: Centralise list/enumeration of settings panes, so we don't run into trouble in future.
        var allowedSections = ['', 'general', 'user', 'apps'],
            section = req.url.replace(/(^\/ghost\/settings[\/]*|\/$)/ig, '');

        if (allowedSections.indexOf(section) < 0) {
            return next();
        }

        res.render('settings', {
            bodyClass: 'settings',
            adminNav: setSelected(adminNavbar, 'settings')
        });
    },
    // Route: debug
    // path: /ghost/debug/
    // Method: GET
    'debug': {
        index: function (req, res) {
            /*jslint unparam:true*/
            res.render('debug', {
                bodyClass: 'settings',
                adminNav: setSelected(adminNavbar, 'settings')
            });
        },
        // frontend route for downloading a file
        exportContent: function (req, res) {
            /*jslint unparam:true*/
            api.db.exportContent().then(function (exportData) {
                // send a file to the client
                res.set('Content-Disposition', 'attachment; filename="GhostData.json"');
                res.json(exportData);
            }).otherwise(function (err) {
                var notification = {
                    type: 'error',
                    message: 'Your export file could not be generated.',
                    status: 'persistent',
                    id: 'errorexport'
                };

                errors.logError(err, 'admin.js', "Your export file could not be generated.");

                return api.notifications.add(notification).then(function () {
                    res.redirect(config().paths.subdir + '/ghost/debug');
                });
            });
        }
    },
    // Route: upload
    // Path: /ghost/upload/
    // Method: POST
    'upload': function (req, res) {
        var type = req.files.uploadimage.type,
            ext = path.extname(req.files.uploadimage.name).toLowerCase(),
            store = storage.get_storage();

        if ((type !== 'image/jpeg' && type !== 'image/png' && type !== 'image/gif' && type !== 'image/svg+xml')
                || (ext !== '.jpg' && ext !== '.jpeg' && ext !== '.png' && ext !== '.gif' && ext !== '.svg' && ext !== '.svgz')) {
            return res.send(415, 'Unsupported Media Type');
        }

        store
            .save(req.files.uploadimage)
            .then(function (url) {
                return res.send(url);
            })
            .otherwise(function (e) {
                errors.logError(e);
                return res.send(500, e.message);
            });
    },
    // Route: signout
    // Path: /ghost/signout/
    // Method: GET
    'signout': function (req, res) {
        req.session.destroy();

        var notification = {
            type: 'success',
            message: 'You were successfully signed out',
            status: 'passive',
            id: 'successlogout'
        };

        return api.notifications.add(notification).then(function () {
            res.redirect(config().paths.subdir + '/ghost/signin/');
        });
    },
    // Route: signin
    // Path: /ghost/signin/
    // Method: GET
    'signin': function (req, res) {
        /*jslint unparam:true*/
        res.render('login', {
            bodyClass: 'ghost-login',
            hideNavbar: true,
            adminNav: setSelected(adminNavbar, 'login')
        });
    },
    // Route: doSignin
    // Path: /ghost/signin/
    // Method: POST
    'doSignin': function (req, res) {
        var currentTime = process.hrtime()[0],
            remoteAddress = req.connection.remoteAddress,
            denied = '';
        loginSecurity = _.filter(loginSecurity, function (ipTime) {
            return (ipTime.time + 2 > currentTime);
        });
        denied = _.find(loginSecurity, function (ipTime) {
            return (ipTime.ip === remoteAddress);
        });

        if (!denied) {
            loginSecurity.push({ip: remoteAddress, time: currentTime});
            api.users.check({email: req.body.email, pw: req.body.password}).then(function (user) {
                req.session.regenerate(function (err) {
                    if (!err) {
                        req.session.user = user.id;
                        var redirect = config().paths.subdir + '/ghost/';
                        if (req.body.redirect) {
                            redirect += decodeURIComponent(req.body.redirect);
                        }
                        // If this IP address successfully logs in we
                        // can remove it from the array of failed login attempts.
                        loginSecurity = _.reject(loginSecurity, function (ipTime) {
                            return ipTime.ip === remoteAddress;
                        });
                        res.json(200, {redirect: redirect});
                    }
                });
            }, function (error) {
                res.json(401, {error: error.message});
            });
        } else {
            res.json(401, {error: 'Slow down, there are way too many login attempts!'});
        }
    },
    // Route: signup
    // Path: /ghost/signup/
    // Method: GET
    'signup': function (req, res) {
        /*jslint unparam:true*/
        res.render('signup', {
            bodyClass: 'ghost-signup',
            hideNavbar: true,
            adminNav: setSelected(adminNavbar, 'login')
        });
    },
    // Route: doSignup
    // Path: /ghost/signup/
    // Method: POST
    'doSignup': function (req, res) {
        var name = req.body.name,
            email = req.body.email,
            password = req.body.password;

        api.users.add({
            name: name,
            email: email,
            password: password
        }).then(function (user) {
            api.settings.edit('email', email).then(function () {
                var message = {
                    to: email,
                    subject: 'Your New Ghost Blog',
                    html: '<p><strong>Hello!</strong></p>' +
                          '<p>Good news! You\'ve successfully created a brand new Ghost blog over on ' + config().url + '</p>' +
                          '<p>You can log in to your admin account with the following details:</p>' +
                          '<p> Email Address: ' + email + '<br>' +
                          'Password: The password you chose when you signed up</p>' +
                          '<p>Keep this email somewhere safe for future reference, and have fun!</p>' +
                          '<p>xoxo</p>' +
                          '<p>Team Ghost<br>' +
                          '<a href="https://ghost.org">https://ghost.org</a></p>'
                };
                mailer.send(message).otherwise(function (error) {
                    errors.logError(
                        error.message,
                        "Unable to send welcome email, your blog will continue to function.",
                        "Please see http://docs.ghost.org/mail/ for instructions on configuring email."
                    );
                });

                req.session.regenerate(function (err) {
                    if (!err) {
                        if (req.session.user === undefined) {
                            req.session.user = user.id;
                        }
                        res.json(200, {redirect: config().paths.subdir + '/ghost/'});
                    }
                });
            });
        }).otherwise(function (error) {
            res.json(401, {error: error.message});
        });
    },
    // Route: forgotten
    // Path: /ghost/forgotten/
    // Method: GET
    'forgotten': function (req, res) {
        /*jslint unparam:true*/
        res.render('forgotten', {
            bodyClass: 'ghost-forgotten',
            hideNavbar: true,
            adminNav: setSelected(adminNavbar, 'login')
        });
    },
    // Route: doForgotten
    // Path: /ghost/forgotten/
    // Method: POST
    'doForgotten': function (req, res) {
        var email = req.body.email;

        api.users.generateResetToken(email).then(function (token) {
            var siteLink = '<a href="' + config().url + '">' + config().url + '</a>',
                resetUrl = config().url.replace(/\/$/, '') +  '/ghost/reset/' + token + '/',
                resetLink = '<a href="' + resetUrl + '">' + resetUrl + '</a>',
                message = {
                    to: email,
                    subject: 'Reset Password',
                    html: '<p><strong>Hello!</strong></p>' +
                          '<p>A request has been made to reset the password on the site ' + siteLink + '.</p>' +
                          '<p>Please follow the link below to reset your password:<br><br>' + resetLink + '</p>' +
                          '<p>Ghost</p>'
                };

            return mailer.send(message);
        }).then(function success() {
            var notification = {
                type: 'success',
                message: 'Check your email for further instructions',
                status: 'passive',
                id: 'successresetpw'
            };

            return api.notifications.add(notification).then(function () {
                res.json(200, {redirect: config().paths.subdir + '/ghost/signin/'});
            });

        }, function failure(error) {
            // TODO: This is kind of sketchy, depends on magic string error.message from Bookshelf.
            if (error && error.message === 'EmptyResponse') {
                error.message = "Invalid email address";
            }

            res.json(401, {error: error.message});
        });
    },
    // Route: reset
    // Path: /ghost/reset/:token
    // Method: GET
    'reset': function (req, res) {
        // Validate the request token
        var token = req.params.token;

        api.users.validateToken(token).then(function () {
            // Render the reset form
            res.render('reset', {
                bodyClass: 'ghost-reset',
                hideNavbar: true,
                adminNav: setSelected(adminNavbar, 'reset')
            });
        }).otherwise(function (err) {
            // Redirect to forgotten if invalid token
            var notification = {
                type: 'error',
                message: 'Invalid or expired token',
                status: 'persistent',
                id: 'errorinvalidtoken'
            };

            errors.logError(err, 'admin.js', "Please check the provided token for validity and expiration.");

            return api.notifications.add(notification).then(function () {
                res.redirect(config().paths.subdir + '/ghost/forgotten');
            });
        });
    },
    // Route: doReset
    // Path: /ghost/reset/:token
    // Method: POST
    'doReset': function (req, res) {
        var token = req.params.token,
            newPassword = req.param('newpassword'),
            ne2Password = req.param('ne2password');

        api.users.resetPassword(token, newPassword, ne2Password).then(function () {
            var notification = {
                type: 'success',
                message: 'Password changed successfully.',
                status: 'passive',
                id: 'successresetpw'
            };

            return api.notifications.add(notification).then(function () {
                res.json(200, {redirect: config().paths.subdir + '/ghost/signin/'});
            });
        }).otherwise(function (err) {
            res.json(401, {error: err.message});
        });
    },
    // Route: doChangePassword
    // Path: /ghost/changepw/
    // Method: POST
    'doChangePassword': function (req, res) {
        return api.users.changePassword({
            currentUser: req.session.user,
            oldpw: req.body.password,
            newpw: req.body.newpassword,
            ne2pw: req.body.ne2password
        }).then(function () {
            res.json(200, {msg: 'Password changed successfully'});
        }, function (error) {
            res.send(401, {error: error.message});
        });
    }
};

module.exports = adminControllers;