/*
	NodeBB - A forum powered by node in development by designcreateplay
	Copyright (C) 2013  DesignCreatePlay Inc.

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


"use strict";

var nconf = require('nconf');
nconf.argv().env();

var fs = require('fs'),
	os = require('os'),
	semver = require('semver'),
	winston = require('winston'),
	path = require('path'),
	pkg = require('./package.json'),
	utils = require('./public/src/utils.js');


global.env = process.env.NODE_ENV || 'production';

winston.remove(winston.transports.Console);
winston.add(winston.transports.Console, {
	colorize: true
});

winston.add(winston.transports.File, {
	filename: 'logs/error.log',
	level: 'error'
});

// TODO: remove once https://github.com/flatiron/winston/issues/280 is fixed
winston.err = function (err) {
	winston.error(err.stack);
};

if(os.platform() === 'linux') {
	require('child_process').exec('/usr/bin/which convert', function(err, stdout, stderr) {
		if(err || !stdout) {
			winston.warn('Couldn\'t find convert. Did you install imagemagick?');
		}
	});
}

// Log GNU copyright info along with server info
winston.info('NodeBB v' + pkg.version + ' Copyright (C) 2013 DesignCreatePlay Inc.');
winston.info('This program comes with ABSOLUTELY NO WARRANTY.');
winston.info('This is free software, and you are welcome to redistribute it under certain conditions.');
winston.info('');

// Alternate configuration file support
var	configFile = __dirname + '/config.json',
	configExists;
if (nconf.get('config')) {
	configFile = path.resolve(__dirname, nconf.get('config'));
}
configExists = fs.existsSync(configFile);

if (!nconf.get('help') && !nconf.get('setup') && !nconf.get('install') && !nconf.get('upgrade') && !nconf.get('reset') && configExists) {
	start();
} else if (nconf.get('setup') || nconf.get('install') || !configExists) {
	setup();
} else if (nconf.get('upgrade')) {
	upgrade();
} else if (nconf.get('reset')) {
	reset();
} else {
	displayHelp();
}

function loadConfig() {
	nconf.file({
		file: configFile
	});

	nconf.defaults({
		themes_path: path.join(__dirname, 'node_modules')
	});

	// Ensure themes_path is a full filepath
	nconf.set('themes_path', path.resolve(__dirname, nconf.get('themes_path')));
}

function start() {
	loadConfig();

	nconf.set('url', nconf.get('base_url') + (nconf.get('use_port') ? ':' + nconf.get('port') : '') + nconf.get('relative_path'));
	nconf.set('upload_url', path.join(path.sep, 'uploads', path.sep));
	nconf.set('base_dir', __dirname);
	nconf.set('views_dir', path.join(__dirname, 'public/templates'));

	winston.info('Time: ' + new Date());
	winston.info('Initializing NodeBB v' + pkg.version);
	winston.info('* using configuration stored in: ' + configFile);
	var host = nconf.get(nconf.get('database') + ':host');
	winston.info('* using ' + nconf.get('database') +' store at ' + host + (host.indexOf('/') === -1 ? ':' + nconf.get(nconf.get('database') + ':port') : ''));
	winston.info('* using themes stored in: ' + nconf.get('themes_path'));

	if (process.env.NODE_ENV === 'development') {
		winston.info('Base Configuration OK.');
	}

	var meta = require('./src/meta');

	require('./src/database').init(function(err) {
		meta.configs.init(function () {
			var templates = require('./public/src/templates'),
				translator = require('./public/src/translator'),
				webserver = require('./src/webserver'),
				sockets = require('./src/socket.io'),
				plugins = require('./src/plugins'),
				upgrade = require('./src/upgrade');

			templates.setGlobal('relative_path', nconf.get('relative_path'));

			upgrade.check(function(schema_ok) {
				if (schema_ok || nconf.get('check-schema') === false) {
					sockets.init(webserver.server);
					plugins.init();
					translator.loadServer();

					nconf.set('base_templates_path', path.join(nconf.get('themes_path'), 'nodebb-theme-vanilla/templates'));
					nconf.set('theme_templates_path', meta.config['theme:templates'] ? path.join(nconf.get('themes_path'), meta.config['theme:id'], meta.config['theme:templates']) : nconf.get('base_templates_path'));

					plugins.ready(function() {
						webserver.init();
					});

					process.on('SIGTERM', shutdown);
					process.on('SIGINT', shutdown);
					process.on('SIGHUP', restart);
					process.on('uncaughtException', function(err) {
						winston.error('[app] Encountered Uncaught Exception: ' + err.message);
						console.log(err.stack);
						restart();
					});
				} else {
					winston.warn('Your NodeBB schema is out-of-date. Please run the following command to bring your dataset up to spec:');
					winston.warn('    node app --upgrade');
					winston.warn('To ignore this error (not recommended):');
					winston.warn('    node app --no-check-schema');
					process.exit();
				}
			});
		});
	});
}

function setup() {
	loadConfig();

	if (nconf.get('setup')) {
		winston.info('NodeBB Setup Triggered via Command Line');
	} else {
		winston.warn('Configuration not found, starting NodeBB setup');
	}

	var install = require('./src/install');

	winston.info('Welcome to NodeBB!');
	winston.info('This looks like a new installation, so you\'ll have to answer a few questions about your environment before we can proceed.');
	winston.info('Press enter to accept the default setting (shown in brackets).');

	install.setup(function (err) {
		if (err) {
			winston.error('There was a problem completing NodeBB setup: ', err.message);
		} else {
			winston.info('NodeBB Setup Completed. Run \'./nodebb start\' to manually start your NodeBB server.');
		}

		process.exit();
	});
}

function upgrade() {
	loadConfig();

	var meta = require('./src/meta');

	require('./src/database').init(function(err) {
		meta.configs.init(function () {
			require('./src/upgrade').upgrade();
		});
	});
}

function reset() {
	loadConfig();

	var meta = require('./src/meta'),
		db = require('./src/database'),
		async = require('async');

	db.init(function(err) {
		meta.configs.init(function () {
			async.parallel([
				function(next) {
					db.delete('plugins:active', next);
				},
				function(next) {
					meta.configs.set('theme:type', 'local', next);
				},
				function(next) {
					meta.configs.set('theme:id', 'nodebb-theme-vanilla', next);
				},
				function(next) {
					meta.configs.set('theme:staticDir', '', next);
				},
				function(next) {
					meta.configs.set('theme:templates', '', next);
				}
			], function(err) {
				if (err) {
					winston.error(err);
				} else {
					winston.info("Successfully reset theme to Vanilla and disabled all plugins.");
				}

				process.exit();
			});
		});
	});
}

function shutdown(code) {
	winston.info('[app] Shutdown (SIGTERM/SIGINT) Initialised.');
	require('./src/database').close();
	winston.info('[app] Database connection closed.');

	winston.info('[app] Shutdown complete.');
	process.exit();
}

function restart() {
	if (process.send) {
		winston.info('[app] Restarting...');
		process.send('nodebb:restart');
	} else {
		winston.error('[app] Could not restart server. Shutting down.');
		shutdown();
	}
}

function displayHelp() {
	winston.info('Usage: node app [options] [arguments]');
	winston.info('       [NODE_ENV=development | NODE_ENV=production] node app [--start] [arguments]');
	winston.info('');
	winston.info('Options:');
	winston.info('  --help              displays this usage information');
	winston.info('  --setup             configure your environment and setup NodeBB');
	winston.info('  --upgrade           upgrade NodeBB, first read: github.com/designcreateplay/NodeBB/wiki/Upgrading-NodeBB');
	winston.info('  --reset             soft resets NodeBB; disables all plugins and restores selected theme to Vanilla');
	winston.info('  --start             manually start NodeBB (default when no options are given)');
}