/* jslint node: true */
/* eslint-disable no-console */
'use strict';

//var SegfaultHandler = require('segfault-handler');
//SegfaultHandler.registerHandler('enigma-bbs-segfault.log');

//  ENiGMA½
const conf          = require('./config.js');
const logger        = require('./logger.js');
const database      = require('./database.js');
const resolvePath   = require('./misc_util.js').resolvePath;

//  deps
const async         = require('async');
const util          = require('util');
const _             = require('lodash');
const mkdirs        = require('fs-extra').mkdirs;
const fs            = require('graceful-fs');
const paths         = require('path');

//  our main entry point
exports.main    = main;

//  object with various services we want to de-init/shutdown cleanly if possible
const initServices = {};

//  only include bbs.js once @ startup; this should be fine
const COPYRIGHT = fs.readFileSync(paths.join(__dirname, '../LICENSE.TXT'), 'utf8').split(/\r?\n/g)[0];

const FULL_COPYRIGHT    = `ENiGMA½ ${COPYRIGHT}`;
const HELP =
`${FULL_COPYRIGHT}
usage: main.js <args>
eg   : main.js --config /enigma_install_path/config/

valid args:
  --version       : display version
  --help          : displays this help
  --config PATH   : override default config path
`;

function printHelpAndExit() {
    console.info(HELP);
    process.exit();
}

function main() {
    async.waterfall(
        [
            function processArgs(callback) {
                const argv = require('minimist')(process.argv.slice(2));

                if(argv.help) {
                    printHelpAndExit();
                }

                const configOverridePath = argv.config;

                return callback(null, configOverridePath || conf.getDefaultPath(), _.isString(configOverridePath));
            },
            function initConfig(configPath, configPathSupplied, callback) {
                const configFile = configPath + 'config.hjson';
                conf.init(resolvePath(configFile), function configInit(err) {

                    //
                    //  If the user supplied a path and we can't read/parse it
                    //  then it's a fatal error
                    //
                    if(err) {
                        if('ENOENT' === err.code)  {
                            if(configPathSupplied) {
                                console.error('Configuration file does not exist: ' + configFile);
                            } else {
                                configPathSupplied = null;  //  make non-fatal; we'll go with defaults
                            }
                        } else {
                            console.error(err.message);
                        }
                    }
                    return callback(err);
                });
            },
            function initSystem(callback) {
                initialize(function init(err) {
                    if(err) {
                        console.error('Error initializing: ' + util.inspect(err));
                    }
                    return callback(err);
                });
            }
        ],
        function complete(err) {
            if(!err) {
                //  note this is escaped:
                fs.readFile(paths.join(__dirname, '../misc/startup_banner.asc'), 'utf8', (err, banner) => {
                    console.info(FULL_COPYRIGHT);
                    if(!err) {
                        console.info(banner);
                    }
                    console.info('System started!');
                });
            }

            if(err) {
                console.error('Error initializing: ' + util.inspect(err));
            }
        }
    );
}

function shutdownSystem() {
    const msg = 'Process interrupted. Shutting down...';
    console.info(msg);
    logger.log.info(msg);

    async.series(
        [
            function closeConnections(callback) {
                const ClientConns = require('./client_connections.js');
                const activeConnections = ClientConns.getActiveConnections();
                let i = activeConnections.length;
                while(i--) {
                    const activeTerm = activeConnections[i].term;
                    if(activeTerm) {
                        activeTerm.write('\n\nServer is shutting down NOW! Disconnecting...\n\n');
                    }
                    ClientConns.removeClient(activeConnections[i]);
                }
                callback(null);
            },
            function stopListeningServers(callback) {
                return require('./listening_server.js').shutdown( () => {
                    return callback(null);  //  ignore err
                });
            },
            function stopEventScheduler(callback) {
                if(initServices.eventScheduler) {
                    return initServices.eventScheduler.shutdown( () => {
                        return callback(null);  // ignore err
                    });
                } else {
                    return callback(null);
                }
            },
            function stopFileAreaWeb(callback) {
                require('./file_area_web.js').startup( () => {
                    return callback(null);  // ignore err
                });
            },
            function stopMsgNetwork(callback) {
                require('./msg_network.js').shutdown(callback);
            }
        ],
        () => {
            console.info('Goodbye!');
            return process.exit();
        }
    );
}

function initialize(cb) {
    async.series(
        [
            function createMissingDirectories(callback) {
                async.each(Object.keys(conf.config.paths), function entry(pathKey, next) {
                    mkdirs(conf.config.paths[pathKey], function dirCreated(err) {
                        if(err) {
                            console.error('Could not create path: ' + conf.config.paths[pathKey] + ': ' + err.toString());
                        }
                        return next(err);
                    });
                }, function dirCreationComplete(err) {
                    return callback(err);
                });
            },
            function basicInit(callback) {
                logger.init();
                logger.log.info(
                    { version : require('../package.json').version },
                    '**** ENiGMA½ Bulletin Board System Starting Up! ****');

                process.on('SIGINT', shutdownSystem);

                require('later').date.localTime();  //  use local times for later.js/scheduling

                return callback(null);
            },
            function initDatabases(callback) {
                return database.initializeDatabases(callback);
            },
            function initMimeTypes(callback) {
                return require('./mime_util.js').startup(callback);
            },
            function initStatLog(callback) {
                return require('./stat_log.js').init(callback);
            },
            function initConfigs(callback) {
                return require('./config_util.js').init(callback);
            },
            function initThemes(callback) {
                //  Have to pull in here so it's after Config init
                require('./theme.js').initAvailableThemes( (err, themeCount) => {
                    logger.log.info({ themeCount }, 'Themes initialized');
                    return callback(err);
                });
            },
            function loadSysOpInformation(callback) {
                //
                //  Copy over some +op information from the user DB -> system propertys.
                //  * Makes this accessible for MCI codes, easy non-blocking access, etc.
                //  * We do this every time as the op is free to change this information just
                //    like any other user
                //
                const User = require('./user.js');

                async.waterfall(
                    [
                        function getOpUserName(next) {
                            return User.getUserName(1, next);
                        },
                        function getOpProps(opUserName, next) {
                            const propLoadOpts = {
                                names   : [ 'real_name', 'sex', 'email_address', 'location', 'affiliation' ],
                            };
                            User.loadProperties(User.RootUserID, propLoadOpts, (err, opProps) => {
                                return next(err, opUserName, opProps);
                            });
                        }
                    ],
                    (err, opUserName, opProps) => {
                        const StatLog = require('./stat_log.js');

                        if(err) {
                            [ 'username', 'real_name', 'sex', 'email_address', 'location', 'affiliation' ].forEach(v => {
                                StatLog.setNonPeristentSystemStat(`sysop_${v}`, 'N/A');
                            });
                        } else {
                            opProps.username = opUserName;

                            _.each(opProps, (v, k) => {
                                StatLog.setNonPeristentSystemStat(`sysop_${k}`, v);
                            });
                        }

                        return callback(null);
                    }
                );
            },
            function initFileAreaStats(callback) {
                const getAreaStats = require('./file_base_area.js').getAreaStats;
                getAreaStats( (err, stats) => {
                    if(!err) {
                        const StatLog = require('./stat_log.js');
                        StatLog.setNonPeristentSystemStat('file_base_area_stats', stats);
                    }

                    return callback(null);
                });
            },
            function initMCI(callback) {
                return require('./predefined_mci.js').init(callback);
            },
            function readyMessageNetworkSupport(callback) {
                return require('./msg_network.js').startup(callback);
            },
            function readyEvents(callback) {
                return require('./events.js').startup(callback);
            },
            function listenConnections(callback) {
                return require('./listening_server.js').startup(callback);
            },
            function readyFileBaseArea(callback) {
                return require('./file_base_area.js').startup(callback);
            },
            function readyFileAreaWeb(callback) {
                return require('./file_area_web.js').startup(callback);
            },
            function readyPasswordReset(callback) {
                const WebPasswordReset = require('./web_password_reset.js').WebPasswordReset;
                return WebPasswordReset.startup(callback);
            },
            function readyEventScheduler(callback) {
                const EventSchedulerModule = require('./event_scheduler.js').EventSchedulerModule;
                EventSchedulerModule.loadAndStart( (err, modInst) => {
                    initServices.eventScheduler = modInst;
                    return callback(err);
                });
            }
        ],
        function onComplete(err) {
            return cb(err);
        }
    );
}