'use strict';

const Joi = require('../joi');
const MongoPaging = require('mongo-cursor-pagination-node6');
const ObjectID = require('mongodb').ObjectID;

module.exports = (db, server, userHandler) => {
    /**
     * @api {post} /authenticate Authenticate an User
     * @apiName PostAuth
     * @apiGroup Authentication
     * @apiHeader {String} X-Access-Token Optional access token if authentication is enabled
     * @apiHeaderExample {json} Header-Example:
     * {
     *   "X-Access-Token": "59fc66a03e54454869460e45"
     * }
     *
     * @apiParam {String} username Username or E-mail address
     * @apiParam {String} password Password
     * @apiParam {String} [protocol] Application identifier for security logs
     * @apiParam {String} [scope="master"] Required scope. One of <code>master</code>, <code>imap</code>, <code>smtp</code>, <code>pop3</code>
     * @apiParam {String} [sess] Session identifier for the logs
     * @apiParam {String} [ip] IP address for the logs
     *
     * @apiSuccess {Boolean} success Indicates successful response
     * @apiSuccess {String} id ID of authenticated User
     * @apiSuccess {String} username Username of authenticated User
     * @apiSuccess {String} scope The scope this authentication is valid for
     * @apiSuccess {String[]} require2fa List of enabled 2FA mechanisms
     * @apiSuccess {Boolean} requirePasswordChange Indicates if account hassword has been reset and should be replaced
     *
     * @apiError error Description of the error
     *
     * @apiExample {curl} Example usage:
     *     curl -i -XPOST http://localhost:8080/authenticate \
     *     -H 'Content-type: application/json' \
     *     -d '{
     *       "username": "myuser",
     *       "password": "secretpass",
     *       "scope": "master"
     *     }'
     *
     * @apiSuccessExample {json} Success-Response:
     *     HTTP/1.1 200 OK
     *     {
     *       "success": true,
     *       "id": "5a12914c350c183bd0d331f0",
     *       "username": "myuser",
     *       "scope": "master",
     *       "require2fa": [
     *         "totp"
     *       ],
     *       "requirePasswordChange": false
     *     }
     *
     * @apiErrorExample {json} Error-Response:
     *     HTTP/1.1 200 OK
     *     {
     *       "error": "Authentication failed. Invalid scope"
     *     }
     */
    server.post('/authenticate', (req, res, next) => {
        res.charSet('utf-8');

        const schema = Joi.object().keys({
            username: Joi.alternatives()
                .try(
                    Joi.string()
                        .lowercase()
                        .regex(/^[a-z](?:\.?[a-z0-9]+)*$/, 'username')
                        .min(3)
                        .max(30),
                    Joi.string().email()
                )
                .required(),
            password: Joi.string()
                .max(256)
                .required(),

            protocol: Joi.string().default('API'),
            scope: Joi.string().default('master'),

            sess: Joi.string().max(255),
            ip: Joi.string().ip({
                version: ['ipv4', 'ipv6'],
                cidr: 'forbidden'
            })
        });

        const result = Joi.validate(req.params, schema, {
            abortEarly: false,
            convert: true
        });

        if (result.error) {
            res.json({
                error: result.error.message
            });
            return next();
        }

        let meta = {
            protocol: result.value.protocol,
            sess: result.value.sess,
            ip: result.value.ip
        };

        userHandler.authenticate(result.value.username, result.value.password, result.value.scope, meta, (err, authData) => {
            if (err) {
                res.json({
                    error: err.message
                });
                return next();
            }

            if (!authData) {
                res.json({
                    error: 'Authentication failed'
                });
                return next();
            }

            let authResponse = {
                success: true,
                id: authData.user,
                username: authData.username,
                scope: authData.scope,
                require2fa: authData.require2fa,
                requirePasswordChange: authData.requirePasswordChange
            };

            if (authData.u2fAuthRequest) {
                authResponse.u2fAuthRequest = authData.u2fAuthRequest;
            }

            res.json(authResponse);

            return next();
        });
    });

    /**
     * @api {get} /users/:user/authlog List authentication Events
     * @apiName GetAuthlog
     * @apiGroup Authentication
     * @apiHeader {String} X-Access-Token Optional access token if authentication is enabled
     * @apiHeaderExample {json} Header-Example:
     * {
     *   "X-Access-Token": "59fc66a03e54454869460e45"
     * }
     *
     * @apiParam {String} user ID of the User
     * @apiParam {String} [action] Limit listing only to values with specific action value
     * @apiParam {String} [sess] Limit listing only to values with specific session identifier
     * @apiParam {String} [ip Limit listing only to values with specific IP address
     * @apiParam {Number} [limit=20] How many records to return
     * @apiParam {Number} [page=1] Current page number. Informational only, page numbers start from 1
     * @apiParam {Number} [next] Cursor value for next page, retrieved from <code>nextCursor</code> response value
     * @apiParam {Number} [previous] Cursor value for previous page, retrieved from <code>previousCursor</code> response value
     *
     * @apiSuccess {Boolean} success Indicates successful response
     * @apiSuccess {Number} total How many results were found
     * @apiSuccess {Number} page Current page number. Derived from <code>page</code> query argument
     * @apiSuccess {String} previousCursor Either a cursor string or false if there are not any previous results
     * @apiSuccess {String} nextCursor Either a cursor string or false if there are not any next results
     * @apiSuccess {Object[]} results Event listing
     * @apiSuccess {String} results.id ID of the Event
     * @apiSuccess {String} results.action Action identifier
     * @apiSuccess {String} results.result Did the action succeed
     * @apiSuccess {String} results.sess Session identifier
     * @apiSuccess {String} results.ip IP address of the Event
     * @apiSuccess {String} results.created Datestring of the Event time
     *
     * @apiError error Description of the error
     *
     * @apiExample {curl} Example usage:
     *     curl -i "http://localhost:8080/users/59fc66a03e54454869460e45/authlog?action=account+created"
     *
     * @apiSuccessExample {json} Success-Response:
     *     HTTP/1.1 200 OK
     *     {
     *       "success": true,
     *       "action": "account created",
     *       "total": 1,
     *       "page": 1,
     *       "previousCursor": false,
     *       "nextCursor": false,
     *       "results": [
     *         {
     *           "id": "59fc66a03e54454869460e4d",
     *           "action": "account created",
     *           "result": "success",
     *           "sess": null,
     *           "ip": null,
     *           "created": "2017-11-03T12:52:48.792Z",
     *           "expires": "2017-12-03T12:52:48.792Z"
     *         }
     *       ]
     *     }
     *
     * @apiErrorExample {json} Error-Response:
     *     HTTP/1.1 200 OK
     *     {
     *       "error": "Database error"
     *     }
     */
    server.get({ name: 'authlog', path: '/users/:user/authlog' }, (req, res, next) => {
        res.charSet('utf-8');

        const schema = Joi.object().keys({
            user: Joi.string()
                .hex()
                .lowercase()
                .length(24)
                .required(),
            action: Joi.string()
                .trim()
                .lowercase()
                .empty('')
                .max(100),
            sess: Joi.string()
                .trim()
                .lowercase()
                .empty('')
                .max(100),
            ip: Joi.string().ip({
                version: ['ipv4', 'ipv6'],
                cidr: 'forbidden'
            }),
            limit: Joi.number()
                .default(20)
                .min(1)
                .max(250),
            next: Joi.string()
                .empty('')
                .mongoCursor()
                .max(1024),
            previous: Joi.string()
                .empty('')
                .mongoCursor()
                .max(1024),
            page: Joi.number()
                .empty('')
                .default(1)
        });

        req.query.user = req.params.user;

        const result = Joi.validate(req.query, schema, {
            abortEarly: false,
            convert: true,
            allowUnknown: false
        });

        if (result.error) {
            res.json({
                error: result.error.message
            });
            return next();
        }

        let user = new ObjectID(result.value.user);
        let limit = result.value.limit;
        let action = result.value.action;
        let sess = result.value.sess;
        let ip = result.value.ip;
        let page = result.value.page;
        let pageNext = result.value.next;
        let pagePrevious = result.value.previous;

        db.users.collection('users').findOne(
            {
                _id: user
            },
            {
                fields: {
                    _id: true
                }
            },
            (err, userData) => {
                if (err) {
                    res.json({
                        error: 'MongoDB Error: ' + err.message
                    });
                    return next();
                }
                if (!userData) {
                    res.json({
                        error: 'This user does not exist'
                    });
                    return next();
                }

                let filter = { user };
                if (action) {
                    filter.action = action;
                }
                if (sess) {
                    filter.sess = sess;
                }
                if (ip) {
                    filter.ip = ip;
                }

                db.database.collection('authlog').count(filter, (err, total) => {
                    if (err) {
                        res.json({
                            error: err.message
                        });
                        return next();
                    }

                    let opts = {
                        limit,
                        query: filter,
                        sortAscending: false
                    };

                    if (pageNext) {
                        opts.next = pageNext;
                    } else if (pagePrevious) {
                        opts.previous = pagePrevious;
                    }

                    MongoPaging.find(db.users.collection('authlog'), opts, (err, result) => {
                        if (err) {
                            res.json({
                                error: result.error.message
                            });
                            return next();
                        }

                        if (!result.hasPrevious) {
                            page = 1;
                        }

                        let response = {
                            success: true,
                            action,
                            total,
                            page,
                            previousCursor: result.hasPrevious ? result.previous : false,
                            nextCursor: result.hasNext ? result.next : false,
                            results: (result.results || []).map(resultData => {
                                let response = {
                                    id: resultData._id
                                };
                                Object.keys(resultData).forEach(key => {
                                    if (!['_id', 'user'].includes(key)) {
                                        response[key] = resultData[key];
                                    }
                                });
                                return response;
                            })
                        };

                        res.json(response);
                        return next();
                    });
                });
            }
        );
    });
};