/* global it:false */
/* global describe:false */
/* global before:false */
/* global after:false */

'use strict';

const async = require('async'),
    BoxError = require('../boxerror.js'),
    common = require('./common.js'),
    expect = require('expect.js'),
    externalLdap = require('../externalldap.js'),
    groups = require('../groups.js'),
    ldap = require('ldapjs'),
    safe = require('safetydance'),
    server = require('../server.js'),
    settings = require('../settings.js'),
    superagent = require('superagent'),
    users = require('../users.js'),
    _ = require('underscore');

let gLdapServer;

const LDAP_SHARED_PASSWORD = 'validpassword';
const LDAP_PORT = 4321;
const LDAP_BASE_DN = 'ou=Users,dc=cloudron,dc=io';
const LDAP_GROUP_BASE_DN = 'ou=Groups,dc=cloudron,dc=io';
const LDAP_CONFIG = {
    provider: 'testserver',
    url: `ldap://localhost:${LDAP_PORT}`,
    usernameField: 'customusernameprop',
    baseDn: LDAP_BASE_DN,
    filter: '(objectClass=inetOrgPerson)',
    syncGroups: false,
    groupBaseDn: LDAP_GROUP_BASE_DN,
    groupFilter: '(objectClass=groupOfNames)',
    groupnameField: 'customgroupnameprop',
    autoCreate: false
};

// helper function to deal with pagination taken from ldap.js
function finalSend(results, req, res, next) {
    var min = 0;
    var max = results.length;
    var cookie = null;
    var pageSize = 0;

    // check if this is a paging request, if so get the cookie for session info
    req.controls.forEach(function (control) {
        if (control.type === ldap.PagedResultsControl.OID) {
            pageSize = control.value.size;
            cookie = control.value.cookie;
        }
    });

    function sendPagedResults(start, end) {
        start = (start < min) ? min : start;
        end = (end > max || end < min) ? max : end;
        var i;

        for (i = start; i < end; i++) {
            res.send(results[i]);
        }

        return i;
    }

    if (cookie && Buffer.isBuffer(cookie)) {
        // we have pagination
        var first = min;
        if (cookie.length !== 0) {
            first = parseInt(cookie.toString(), 10);
        }
        var last = sendPagedResults(first, first + pageSize);

        var resultCookie;
        if (last < max) {
            resultCookie = Buffer.from(last.toString());
        } else {
            resultCookie = Buffer.from('');
        }

        res.controls.push(new ldap.PagedResultsControl({
            value: {
                size: pageSize, // correctness not required here
                cookie: resultCookie
            }
        }));
    } else {
        // no pagination simply send all
        results.forEach(function (result) {
            res.send(result);
        });
    }

    // all done
    res.end();
    next();
}

let gLdapUsers = [];
let gLdapGroups = [];

function startLdapServer(callback) {
    gLdapServer = ldap.createServer();

    gLdapServer.search(LDAP_BASE_DN, function (req, res, next) {
        let results = [];

        gLdapUsers.forEach(function (entry) {
            var dn = ldap.parseDN(`cn=${entry.username},${LDAP_BASE_DN}`);

            var obj = {
                dn: dn.toString(),
                attributes: {
                    objectclass: [ 'inetOrgPerson' ],
                    mail: entry.email,
                    cn: entry.displayName
                }
            };

            obj.attributes[LDAP_CONFIG.usernameField] = entry.username;

            if ((req.dn.equals(dn) || req.dn.parentOf(dn)) && req.filter.matches(obj.attributes)) {
                results.push(obj);
            }
        });

        finalSend(results, req, res, next);
    });

    gLdapServer.search(LDAP_GROUP_BASE_DN, function (req, res, next) {
        let results = [];

        gLdapGroups.forEach(function (entry) {
            var dn = ldap.parseDN(`cn=${entry.groupname},${LDAP_GROUP_BASE_DN}`);

            var obj = {
                dn: dn.toString(),
                attributes: {
                    objectclass: [ 'groupOfNames' ],
                    cn: entry.groupname,
                    member: entry.member || []
                }
            };

            obj.attributes[LDAP_CONFIG.groupnameField] = entry.groupname;

            if ((req.dn.equals(dn) || req.dn.parentOf(dn)) && req.filter.matches(obj.attributes)) {
                results.push(obj);
            }
        });

        finalSend(results, req, res, next);
    });

    gLdapServer.bind(LDAP_BASE_DN, function (req, res, next) {
        // extract the common name which might have different attribute names
        var attributeName = Object.keys(req.dn.rdns[0].attrs)[0];
        var commonName = req.dn.rdns[0].attrs[attributeName].value;
        if (!commonName) return next(new ldap.NoSuchObjectError(req.dn.toString()));

        if (!gLdapUsers.find(function (u) { return u.username === commonName; })) return next(new ldap.NoSuchObjectError(req.dn.toString()));
        if (req.credentials !== LDAP_SHARED_PASSWORD) return next(new ldap.InvalidCredentialsError(req.dn.toString()));

        res.end();
    });

    gLdapServer.listen(LDAP_PORT, callback);
}

function stopLdapServer(callback) {
    if (gLdapServer) gLdapServer.close();
    callback();
}

describe('External LDAP', function () {
    const { setup, cleanup, admin, serverUrl, auditSource } = common;

    before(function (done) {
        async.series([
            startLdapServer,
            setup
        ], done);
    });

    after(function (done) {
        async.series([
            stopLdapServer,
            cleanup
        ], done);
    });

    describe('settings', function () {
        it('enabling fails with missing url', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            delete conf.url;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling fails with empty url', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.url = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling fails with missing baseDn', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            delete conf.baseDn;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling fails with empty baseDn', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.baseDn = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling fails with missing filter', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            delete conf.filter;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling fails with empty filter', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.filter = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling succeeds', async function () {
            await settings.setExternalLdapConfig(LDAP_CONFIG);
        });

        it('disabling succeeds', async function () {
            await settings.setExternalLdapConfig({ provider: 'noop' });
        });

        // now test with groups
        it('enabling with groups fails with missing groupBaseDn', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            delete conf.groupBaseDn;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups fails with empty groupBaseDn', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            conf.groupBaseDn = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups fails with missing groupFilter', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            delete conf.groupFilter;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups fails with empty groupFilter', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            conf.groupFilter = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups fails with missing groupnameField', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            delete conf.groupnameField;

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups fails with empty groupnameField', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            conf.groupnameField = '';

            const [error] = await safe(settings.setExternalLdapConfig(conf));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('enabling with groups succeeds', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;

            await settings.setExternalLdapConfig(conf);
        });
    });

    describe('sync', function () {
        it('disable sync', async function () {
            await settings.setExternalLdapConfig({ provider: 'noop' });
        });

        it('fails if disabled', async function () {
            const [error] = await safe(externalLdap.sync(function progress() {}));
            expect(error.reason).to.equal(BoxError.BAD_STATE);
        });

        it('enable', async function () {
            await settings.setExternalLdapConfig(LDAP_CONFIG);
        });

        it('succeeds for new users', async function () {
            gLdapUsers.push({
                username: 'firstuser',
                displayName: 'First User',
                email: 'first@user.com'
            });

            await externalLdap.sync(function progress() {});
            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'firstuser' && u.email === 'first@user.com' && u.displayName === 'First User';
            })).to.be.ok();
        });

        it('succeeds for updated users', async function () {
            gLdapUsers[0].displayName = 'User First';
            gLdapUsers[0].email = 'first@changed.com';

            await externalLdap.sync(function progress() {});
            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'firstuser' && u.email === 'first@changed.com' && u.displayName === 'User First';
            })).to.be.ok();
        });

        it('ignores already existing users with same username', async function () {
            gLdapUsers.push({
                username: admin.username,
                displayName: 'Something Else',
                email: 'foobar@bar.com'
            });

            await externalLdap.sync(function progress() {});
            const result = await users.list();
            expect(result.find(function (u) {
                return u.email === 'foobar@bar.com' || u.displayName === 'Something Else';
            })).to.not.be.ok();
        });

        it('does not sync group if group sync is disabled', async function () {
            gLdapGroups.push({
                groupname: 'extGroup1'
            });

            await externalLdap.sync(function progress() {});
            const result = await groups.list();
            expect(result.length).to.equal(0);
        });

        it('enable with groupSync', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.syncGroups = true;
            await settings.setExternalLdapConfig(conf);
        });

        it('succeeds with groups enabled', async function () {
            gLdapGroups = [];

            await externalLdap.sync(function progress() {});
            const result = await groups.list();
            expect(result.length).to.equal(0);
        });

        it('succeeds with groups enabled and new group', async function () {
            gLdapGroups.push({
                groupname: 'extGroup1'
            });

            await externalLdap.sync(function progress() {});
            const result = await groups.list();
            expect(result.find(function (g) {
                return g.name === 'extgroup1';
            })).to.be.ok();
        });

        it('succeeds with groups enabled and second new group', async function () {
            gLdapGroups.push({
                groupname: 'extGroup2'
            });

            await externalLdap.sync(function progress() {});
            const result = await groups.list();
            expect(result.length).to.be(2);
            expect(result.find(function (g) {
                return g.name === 'extgroup2';
            })).to.be.ok();
        });

        it('does not create already existing group', async function () {
            gLdapGroups.push({
                groupname: 'INTERNALgroup' // also tests lowercasing
            });

            await groups.add({ name: 'internalgroup' });
            await externalLdap.sync(function progress() {});

            const result = await groups.list();
            expect(result.length).to.equal(3);
        });

        it('adds users of groups', async function () {
            gLdapGroups.push({
                groupname: 'nonEmptyGroup',
                member: gLdapUsers.slice(-2).map(function (u) { return `cn=${u.username},${LDAP_CONFIG.baseDn}`; })
            });

            await externalLdap.sync(function progress() {});
            const result = await groups.getByName('nonemptygroup');
            expect(result).to.be.ok();

            const result2 = await groups.getMembers(result.id);
            expect(result2.length).to.equal(2);
        });

        it('adds new users of groups', async function () {
            gLdapGroups.push({
                groupname: 'nonEmptyGroup',
                member: gLdapUsers.map(function (u) { return `cn=${u.username},${LDAP_CONFIG.baseDn}`; }) // has 2 entries
            });

            await externalLdap.sync(function progress() {});
            const result = await groups.getByName('nonemptygroup');
            expect(result).to.be.ok();

            const result2 = await groups.getMembers(result.id);
            expect(result2.length).to.equal(2);
        });

        it('succeeds with only one group member (string instead of array)', async function () {
            gLdapGroups.push({
                groupname: 'onemembergroup',
                member: `cn=${gLdapUsers[0].username},${LDAP_CONFIG.baseDn}`
            });

            await externalLdap.sync(function progress() {});

            const result = await groups.getByName('onemembergroup');
            const result2 = await groups.getMembers(result.id);
            expect(result2.length).to.equal(1);

            const u = await users.get(result2[0]);
            expect(u.username).to.equal(gLdapUsers[0].username);
        });
    });

    describe('user auto creation', function () {
        before(server.start);
        after(server.stop);

        it('enable', async function () {
            await settings.setExternalLdapConfig(LDAP_CONFIG);
        });

        it('fails if auto create is disabled', async function () {
            gLdapUsers.push({
                username: 'autologinuser0',
                displayName: 'Auto Login0',
                email: 'auto0@login.com'
            });

            const response = await superagent.post(`${serverUrl}/api/v1/cloudron/login`)
                .send({ username: 'autologinuser0', password: LDAP_SHARED_PASSWORD })
                .ok(() => true);

            expect(response.status).to.equal(401);

            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'autologinuser0';
            })).to.not.be.ok();
        });

        it('enable auto create', async function () {
            let conf = _.extend({}, LDAP_CONFIG);
            conf.autoCreate = true;
            await settings.setExternalLdapConfig(conf);
        });

        it('fails for unknown user', async function () {
            const response = await superagent.post(`${serverUrl}/api/v1/cloudron/login`)
                .send({ username: 'doesnotexist', password: LDAP_SHARED_PASSWORD })
                .ok(() => true);

            expect(response.status).to.equal(401);

            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'doesnotexist';
            })).to.not.be.ok();
        });

        it('succeeds for known user with wrong password', async function () {
            gLdapUsers.push({
                username: 'autologinuser1',
                displayName: 'Auto Login1',
                email: 'auto1@login.com'
            });

            const response = await superagent.post(`${serverUrl}/api/v1/cloudron/login`)
                .send({ username: 'autologinuser1', password: 'wrongpassword' })
                .ok(() => true);

            expect(response.status).to.equal(401);
            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'autologinuser1';
            })).to.be.ok();
        });

        it('succeeds for known user with correct password', async function () {
            const newUser = {
                username: 'autologinuser2',
                displayName: 'Auto Login2',
                email: 'auto2@login.com',
                password: LDAP_SHARED_PASSWORD
            };

            gLdapUsers.push(newUser);

            await users.add(newUser.email, newUser, auditSource);

            const response = await superagent.post(`${serverUrl}/api/v1/cloudron/login`)
                .send({ username: 'autologinuser2', password: LDAP_SHARED_PASSWORD })
                .ok(() => true);

            expect(response.status).to.equal(200);

            const result = await users.list();
            expect(result.find(function (u) {
                return u.username === 'autologinuser2';
            })).to.be.ok();
        });
    });
});