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

module.exports = Self => {
    Self.remoteMethod('syncAll', {
        description: 'Synchronizes user database with LDAP and Samba',
        http: {
            path: `/syncAll`,
            verb: 'PATCH'
        }
    });

    Self.syncAll = async function() {
        let $ = Self.app.models;
        let usersToSync = new Set();

        // Database

        let accounts = await $.UserAccount.find({
            fields: ['id'],
            include: {
                relation: 'user',
                scope: {
                    fields: ['name'],
                    where: {active: true}
                }
            }
        });

        for (let account of accounts) {
            let user = account.user();
            if (!user) continue;
            usersToSync.add(user.name);
        }

        // LDAP

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

        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);

            res = await ldapClient.search(ldapConfig.baseDn, {
                scope: 'sub',
                attributes: ['uid'],
                filter: `uid=*`
            });

            await new Promise((resolve, reject) => {
                res.on('error', reject);
                res.on('searchEntry', e => usersToSync.add(e.object.uid));
                res.on('end', resolve);
            });

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

        // 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 res = await sshClient.execCommand('samba-tool user list');
            let users = res.stdout.split('\n');
            for (let user of users) usersToSync.add(user.trim());

            await sshClient.dispose();
        }

        // Syncing

        $.RoleInherit.sync();

        let sync = await Self.syncInit();
        for (let user of usersToSync.values()) {
            try {
                await Self.doSync(sync, user);
            } catch (err) {
                console.error(`Cannot sync user '${user}':`, err);
            }
        }
        await Self.syncDeinit(sync);
    };
};