const ldap = require('../../util/ldapjs-extra');
const nthash = require('smbhash').nthash;
const ssh = require('node-ssh');
const crypto = require('crypto');

module.exports = Self => {
    Self.remoteMethod('sync', {
        description: 'Synchronizes the user with the other user databases',
        accepts: [
            {
                arg: 'userName',
                type: 'string',
                description: 'The user name',
                required: true
            }, {
                arg: 'password',
                type: 'string',
                description: 'The password'
            }
        ],
        http: {
            path: `/sync`,
            verb: 'PATCH'
        }
    });

    Self.sync = async function(userName, password) {
        let $ = Self.app.models;

        let user = await $.Account.findOne({
            fields: ['id', 'sync'],
            where: {name: userName}
        });

        if (user && user.sync) return;

        let accountConfig;
        let mailConfig;
        let extraParams;
        let hasAccount = false;

        if (user) {
            accountConfig = await $.AccountConfig.findOne({
                fields: ['homedir', 'shell', 'idBase']
            });
            mailConfig = await $.MailConfig.findOne({
                fields: ['domain']
            });

            user = await $.Account.findById(user.id, {
                fields: [
                    'id',
                    'nickname',
                    'email',
                    'lang',
                    'roleFk',
                    'sync',
                    'active',
                    'created',
                    'updated'
                ],
                where: {name: userName},
                include: {
                    relation: 'roles',
                    scope: {
                        include: {
                            relation: 'inherits',
                            scope: {
                                fields: ['name']
                            }
                        }
                    }
                }
            });

            extraParams = {
                corporateMail: `${userName}@${mailConfig.domain}`,
                uidNumber: accountConfig.idBase + user.id
            };

            hasAccount = user.active
                && await $.UserAccount.exists(user.id);
        }

        if (user) {
            let bcryptPassword = $.User.hashPassword(password);
            await $.Account.upsertWithWhere({id: user.id}, {bcryptPassword});

            await $.user.destroyById(user.id);
            if (hasAccount) {
                await $.user.upsert({
                    id: user.id,
                    username: userName,
                    password: bcryptPassword,
                    email: user.email,
                    created: user.created,
                    updated: user.updated
                });
            }
        }

        // SIP

        if (hasAccount) {
            await Self.rawSql('CALL pbx.sip_setPassword(?, ?)',
                [user.id, password]
            );
        }

        // LDAP

        let ldapConfig = await $.LdapConfig.findOne({
            fields: ['host', 'rdn', 'password', 'baseDn', 'groupDn']
        });

        if (ldapConfig) {
            let ldapClient = ldap.createClient({
                url: `ldap://${ldapConfig.host}:389`
            });

            let ldapPassword = Buffer
                .from(ldapConfig.password, 'base64')
                .toString('ascii');
            await ldapClient.bind(ldapConfig.rdn, ldapPassword);

            let err;
            try {
                // Deletes user

                try {
                    let dn = `uid=${userName},${ldapConfig.baseDn}`;
                    await ldapClient.del(dn);
                } catch (e) {
                    if (e.name !== 'NoSuchObjectError') throw e;
                }

                // Removes user from groups

                let opts = {
                    scope: 'sub',
                    attributes: ['dn'],
                    filter: `&(memberUid=${userName})(objectClass=posixGroup)`
                };
                res = await ldapClient.search(ldapConfig.groupDn, opts);

                let oldGroups = [];
                await new Promise((resolve, reject) => {
                    res.on('error', reject);
                    res.on('searchEntry', e => oldGroups.push(e.object));
                    res.on('end', resolve);
                });

                let reqs = [];
                for (oldGroup of oldGroups) {
                    let change = new ldap.Change({
                        operation: 'delete',
                        modification: {memberUid: userName}
                    });
                    reqs.push(ldapClient.modify(oldGroup.dn, change));
                }
                await Promise.all(reqs);

                if (hasAccount) {
                    // Recreates user

                    let nameArgs = user.nickname.split(' ');
                    let sshaPassword = crypto
                        .createHash('sha1')
                        .update(password)
                        .digest('base64');

                    let dn = `uid=${userName},${ldapConfig.baseDn}`;
                    let newEntry = {
                        uid: userName,
                        objectClass: [
                            'inetOrgPerson',
                            'posixAccount',
                            'sambaSamAccount'
                        ],
                        cn: user.nickname || userName,
                        displayName: user.nickname,
                        givenName: nameArgs[0],
                        sn: nameArgs[1] || 'Empty',
                        mail: extraParams.corporateMail,
                        userPassword: `{SSHA}${sshaPassword}`,
                        preferredLanguage: user.lang,
                        homeDirectory: `${accountConfig.homedir}/${userName}`,
                        loginShell: accountConfig.shell,
                        uidNumber: extraParams.uidNumber,
                        gidNumber: accountConfig.idBase + user.roleFk,
                        sambaSID: '-',
                        sambaNTPassword: nthash(password)
                    };
                    await ldapClient.add(dn, newEntry);

                    // Adds user to groups

                    let reqs = [];
                    for (let role of user.roles()) {
                        let change = new ldap.Change({
                            operation: 'add',
                            modification: {memberUid: userName}
                        });
                        let roleName = role.inherits().name;
                        let dn = `cn=${roleName},${ldapConfig.groupDn}`;
                        reqs.push(ldapClient.modify(dn, change));
                    }
                    await Promise.all(reqs);
                }
            } catch (e) {
                err = e;
            }

            // FIXME: Cannot disconnect, hangs on undind() call
            // await ldapClient.unbind();
            if (err) throw err;
        }

        // Samba

        let sambaConfig = await $.SambaConfig.findOne({
            fields: ['host', 'sshUser', 'sshPass']
        });

        if (sambaConfig) {
            let sshPassword = Buffer
                .from(sambaConfig.sshPass, 'base64')
                .toString('ascii');

            let sshClient = new ssh.NodeSSH();
            await sshClient.connect({
                host: sambaConfig.host,
                username: sambaConfig.sshUser,
                password: sshPassword
            });

            let commands;

            if (hasAccount) {
                commands = [
                    `samba-tool user create "${userName}" `
                        + `--uid-number=${extraParams.uidNumber} `
                        + `--mail-address="${extraParams.corporateMail}" `
                        + `--random-password`,
                    `samba-tool user setexpiry "${userName}" `
                        + `--noexpiry`,
                    `samba-tool user setpassword "${userName}" `
                        + `--newpassword="${password}"`,
                    `mkhomedir_helper "${userName}" 0027`
                ];
            } else {
                commands = [
                    `samba-tool user delete "${userName}"`
                ];
            }

            for (let command of commands)
                await sshClient.execCommand(command);

            await sshClient.dispose();
        }

        // Mark as synchronized

        // if (user)
        //    await $.Account.upsertWithWhere({id: user.id}, {sync: true});
    };
};