/*

 ----------------------------------------------------------------------------
 | qewd-server: Start-up file for Dockerised version of QEWD                |
 |                                                                          |
 | Copyright (c) 2017-19 M/Gateway Developments Ltd,                        |
 | Redhill, Surrey UK.                                                      |
 | All rights reserved.                                                     |
 |                                                                          |
 | http://www.mgateway.com                                                  |
 | Email: rtweed@mgateway.com                                               |
 |                                                                          |
 |                                                                          |
 | Licensed under the Apache License, Version 2.0 (the "License");          |
 | you may not use this file except in compliance with the License.         |
 | You may obtain a copy of the License at                                  |
 |                                                                          |
 |     http://www.apache.org/licenses/LICENSE-2.0                           |
 |                                                                          |
 | Unless required by applicable law or agreed to in writing, software      |
 | distributed under the License is distributed on an "AS IS" BASIS,        |
 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
 | See the License for the specific language governing permissions and      |
 |  limitations under the License.                                          |
 ----------------------------------------------------------------------------

  7 March 2019

*/

var fs = require('fs');
var module_exists = require('module-exists');
var child_process = require('child_process');
var qewd = require('qewd');

const gtm_version =  'V6.3-004';
const ydb_versionp = 'r1.22';
const ydb_version =  'r122';
const ydb_arch =     'armv7l';

function setEnv(params) {
  for (var name in params) {
    process.env[name] = params[name];
  }
}

function installModule(moduleName, modulePath) {
  if (!module_exists(moduleName) && !fs.existsSync('/opt/qewd/mapped/node_modules/' + moduleName)) {
    var prefix = '';
    if (typeof modulePath !== 'undefined') {
      prefix = ' --prefix ' + modulePath;
    }
    child_process.execSync('npm install --unsafe-perm ' + moduleName + prefix, {stdio:[0,1,2]});
    console.log('\n' + moduleName + ' installed');
  }
  else {
    console.log(moduleName + ' already installed');
  }
}

process.env.USER = 'root';
process.env.HOME = '/opt/qewd';

var startup;
var qewd_up = false;
var qewd_up_config_path = '/opt/qewd/mapped/configuration/config.json';
var qewd_up_path = '/opt/qewd/node_modules/qewd/up';

if (fs.existsSync(qewd_up_config_path)) {
  var config = require(qewd_up_config_path);
  qewd_up = (config.qewd_up === true);
}

if (qewd_up) {
  if (process.env.microservice) {
    console.log('starting up microservice ' + process.env.microservice);
    startup = require(qewd_up_path + '/run')(true);
  }
  else {
    console.log('starting up Docker Orchestrator service');
    startup = require(qewd_up_path + '/run')(true);
  }
  if (!startup) {
    console.log('Unable to start QEWD');
    return;
  }
}
else {
  startup = require('/opt/qewd/mapped/startup');
}

var userDefined = startup.userDefined;
if (!userDefined && fs.existsSync('/opt/qewd/mapped/userDefined.json')) {
  userDefined = require('/opt/qewd/mapped/userDefined.json');
}

if (userDefined && userDefined.startup_commands) {
  console.log('Running custom startup commands:');
  userDefined.startup_commands.forEach(function(cmnd) {
   console.log(cmnd);
   child_process.execSync(cmnd, {stdio:[0,1,2]});
  });
}

var npmModules;
var modulePath;
if (fs.existsSync('/opt/qewd/mapped/install_modules.json')) {
  if (!fs.existsSync('/opt/qewd/mapped/node_modules')) {
    fs.mkdirSync('/opt/qewd/mapped/node_modules');
  }

  modulePath = '/opt/qewd/mapped';
  process.env.NODE_PATH = '/opt/qewd/mapped/node_modules:' + process.env.NODE_PATH;
  require('module').Module._initPaths();

  npmModules = require('/opt/qewd/mapped/install_modules.json');
  npmModules.forEach(function(moduleName) {
    console.log('\nInstalling module ' + moduleName + ' to ' + modulePath);
    installModule(moduleName, modulePath);
  });
  console.log('** NODE_PATH = ' + process.env.NODE_PATH);
}

var config = startup.config;

if (!config.database) {
  config.database = {
    type: 'gtm'
  };
}
else if (!config.database.type) {
  config.database.type = 'gtm';
}

if (config.database && config.database.type === 'gtm') {

  // Define YottaDB Environment Variables for Worker Processes

  console.log('Setting up YottaDB Environment');

  var ydb_path = ydb_versionp + '_' + ydb_arch;
  var gtm_path = gtm_version + '_' + ydb_arch;

  config.database = {
    type: 'gtm',
    params:{
      ydb_env: {
        ydb_retention: 42,
        gtm_retention: 42,
        LD_LIBRARY_PATH: '/usr/local/lib/yottadb/' + ydb_version,
        ydb_log: '/tmp/yottadb/' + ydb_path,
        gtm_log: '/tmp/yottadb/' + ydb_path,
        gtm_repl_instance: '/root/.yottadb/' + ydb_path + '/g/yottadb.repl',
        ydb_repl_instance: '/root/.yottadb/' + ydb_path + '/g/yottadb.repl',
        ydb_gbldir: '/root/.yottadb/' + ydb_path + '/g/yottadb.gld',
        ydb_etrap: 'Write:(0=$STACK) "Error occurred: ",$ZStatus,!',
        ydb_dir: '/root/.yottadb',
        gtmver: gtm_path,
        ydb_rel: ydb_path,
        gtmgbldir: '/root/.yottadb/' + ydb_path + '/g/yottadb.gld',
        ydb_routines: '/opt/qewd/node_modules/nodem/src /root/.yottadb/' + ydb_path + '/o*(/root/.yottadb/' + ydb_path + '/r /root/.yottadb/r) /usr/local/lib/yottadb/' + ydb_version + '/libyottadbutil.so',
        gtmroutines: '/opt/qewd/node_modules/nodem/src /root/.yottadb/' + ydb_path + '/o*(/root/.yottadb/' + ydb_path + '/r /root/.yottadb/r) /usr/local/lib/yottadb/' + ydb_version + '/libyottadbutil.so',
        GTMCI: '/opt/qewd/node_modules/nodem/resources/nodem.ci',
        ydb_ci: '/opt/qewd/node_modules/nodem/resources/nodem.ci',
        gtmdir: '/root/.fis-gtm',
        gtm_etrap: 'Write:(0=$STACK) "Error occurred: ",$ZStatus,!',
        ydb_tmp: '/tmp/yottadb/' + ydb_path,
        gtm_tmp: '/tmp/yottadb/' + ydb_path,
        gtm_dist: '/usr/local/lib/yottadb/' + ydb_version,
        ydb_dist: '/usr/local/lib/yottadb/' + ydb_version
      }
    }
  };

  setEnv(config.database.params.ydb_env);

  // workaround NPM5 bug

  try {
    var nm = require('nodem');
  }
  catch(err) { 
    installModule('nodem');
  }

  // rundown the default region database (all globals except CacheTempEWDSession)
  //  it may return an error, so wrap in a try/catch

  try {
    console.log('Running down YottaDB...');
    child_process.execSync(config.database.params.ydb_env.ydb_dist + '/mupip rundown -region DEFAULT', {stdio:[0,1,2]});
    child_process.execSync(config.database.params.ydb_env.ydb_dist + '/mupip rundown -region qewdreg', {stdio:[0,1,2]});
    console.log('Rundown completed');
  }
  catch(err) {
    console.log('Error running down YottaDB: ' + err);
    console.log('Recovering journal...');
    child_process.execSync(config.database.params.ydb_env.ydb_dist + '/mupip journal -recover -backward /root/.yottadb/' + ydb_path + '/g/yottadb.mjl', {stdio:[0,1,2]});
    console.log('Journal recovered');
  }
}

// ready to start QEWD now

var qewd_master = qewd.master;
console.log('Starting QEWD');

var q = qewd_master.start(config, startup.routes);
if (userDefined) {
  for (var name in userDefined) {
    q.userDefined[name] = userDefined[name];
  }
}

if (q.userDefined && q.userDefined.config) {
  q.userDefined.config.qewd_up = qewd_up;
}

var xp = qewd_master.intercept();

// invoke user-specific startup code

if (startup.onStarted) {
  startup.onStarted.call(q, config, xp.app, xp.qx.router, xp.qx);
}