/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org)    *
 *                                                                            *
 * 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 2             *
 * 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, write to the Free Software Foundation     *
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#include "cli/nodewizardcommand.hpp"
#include "cli/nodeutility.hpp"
#include "cli/pkiutility.hpp"
#include "cli/featureutility.hpp"
#include "base/logger.hpp"
#include "base/console.hpp"
#include "base/application.hpp"
#include "base/tlsutility.hpp"
#include "base/scriptglobal.hpp"
#include "base/exception.hpp"
#include <boost/foreach.hpp>
#include <boost/algorithm/string/join.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/case_conv.hpp>
#include <iostream>
#include <string>
#include <fstream>
#include <vector>

using namespace icinga;
namespace po = boost::program_options;

REGISTER_CLICOMMAND("node/wizard", NodeWizardCommand);

String NodeWizardCommand::GetDescription(void) const
{
	return "Wizard for Icinga 2 node setup.";
}

String NodeWizardCommand::GetShortDescription(void) const
{
	return "wizard for node setup";
}

ImpersonationLevel NodeWizardCommand::GetImpersonationLevel(void) const
{
	return ImpersonateRoot;
}

int NodeWizardCommand::GetMaxArguments(void) const
{
	return -1;
}

/**
 * The entry point for the "node wizard" CLI command.
 *
 * @returns An exit status.
 */
int NodeWizardCommand::Run(const boost::program_options::variables_map& vm, const std::vector<std::string>& ap) const
{
	/*
	 * The wizard will get all information from the user,
	 * and then call all required functions.
	 */

	std::cout << ConsoleColorTag(Console_Bold | Console_ForegroundBlue) << "Welcome to the Icinga 2 Setup Wizard!\n"
	    << "\n"
	    << "We'll guide you through all required configuration details.\n"
	    << "\n"
	    << "\n\n" << ConsoleColorTag(Console_Normal);

	//TODO: Add sort of bash completion to path input?

	/* 0. master or node setup?
	 * 1. Ticket
	 * 2. Master information for autosigning
	 * 3. Trusted cert location
	 * 4. CN to use (defaults to FQDN)
	 * 5. Local CA
	 * 6. New self signed certificate
	 * 7. Request signed certificate from master
	 * 8. copy key information to /etc/icinga2/pki
	 * 9. enable ApiListener feature
	 * 10. generate zones.conf with endpoints and zone objects
	 * 11. set NodeName = cn in constants.conf
	 * 12. reload icinga2, or tell the user to
	 */

	std::string answer;
	bool is_node_setup = true;

	std::cout << ConsoleColorTag(Console_Bold) << "Please specify if this is a satellite setup "
	    << "('n' installs a master setup)" << ConsoleColorTag(Console_Normal) << " [Y/n]: ";
	std::getline (std::cin, answer);

	boost::algorithm::to_lower(answer);

	String choice = answer;

	if (choice.Contains("n"))
		is_node_setup = false;

	if (is_node_setup) {
		/* node setup part */
		std::cout << "Starting the Node setup routine...\n";

		/* CN */
		std::cout << ConsoleColorTag(Console_Bold) << "Please specifiy the common name (CN)" << ConsoleColorTag(Console_Normal) << " [" << Utility::GetFQDN() << "]: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty())
			answer = Utility::GetFQDN();

		String cn = answer;
		cn.Trim();

		std::cout << ConsoleColorTag(Console_Bold) << "Please specifiy the local zone name" << ConsoleColorTag(Console_Normal) << " [" << cn << "]: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty())
			answer = cn;

		String local_zone = answer;
		local_zone.Trim();

		std::vector<std::string> endpoints;

		String endpoint_buffer;

		std::cout << ConsoleColorTag(Console_Bold) << "Please specify the master endpoint(s) this node should connect to:" << ConsoleColorTag(Console_Normal) << "\n";
		String master_endpoint_name;

wizard_endpoint_loop_start:

		std::cout << ConsoleColorTag(Console_Bold) << "Master Common Name" << ConsoleColorTag(Console_Normal) << " (CN from your master setup): ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty()) {
			Log(LogWarning, "cli", "Master CN is required! Please retry.");
			goto wizard_endpoint_loop_start;
		}

		endpoint_buffer = answer;
		endpoint_buffer.Trim();

		std::cout << ConsoleColorTag(Console_Bold) << "Please fill out the master connection information:" << ConsoleColorTag(Console_Normal) << "\n";
		std::cout << ConsoleColorTag(Console_Bold) << "Master endpoint host" << ConsoleColorTag(Console_Normal) << " (optional, your master's IP address or FQDN): ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (!answer.empty()) {
			String tmp = answer;
			tmp.Trim();
			endpoint_buffer += "," + tmp;
			master_endpoint_name = tmp; //store the endpoint name for later
		}

		std::cout << ConsoleColorTag(Console_Bold) << "Master endpoint port" << ConsoleColorTag(Console_Normal) << " (optional) []: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (!answer.empty()) {
			String tmp = answer;
			tmp.Trim();
			endpoint_buffer += "," + answer;
		}

		endpoints.push_back(endpoint_buffer);

		std::cout << ConsoleColorTag(Console_Bold) << "Add more master endpoints?" << ConsoleColorTag(Console_Normal) << " [y/N]";
		std::getline (std::cin, answer);

		boost::algorithm::to_lower(answer);

		String choice = answer;

		if (choice.Contains("y") || choice.Contains("j"))
			goto wizard_endpoint_loop_start;

		std::cout << ConsoleColorTag(Console_Bold) << "Please specify the master connection for CSR auto-signing" << ConsoleColorTag(Console_Normal) << " (defaults to master endpoint host):\n";

wizard_master_host:
		std::cout << ConsoleColorTag(Console_Bold) << "Host" << ConsoleColorTag(Console_Normal) << " [" << master_endpoint_name << "]: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty() && !master_endpoint_name.IsEmpty())
			answer = master_endpoint_name;

		if (answer.empty() && master_endpoint_name.IsEmpty())
			goto wizard_master_host;

		String master_host = answer;
		master_host.Trim();

		std::cout << ConsoleColorTag(Console_Bold) << "Port" << ConsoleColorTag(Console_Normal) << " [5665]: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty())
			answer = "5665";

		String master_port = answer;
		master_port.Trim();

		/* workaround for fetching the master cert */
		String pki_path = PkiUtility::GetPkiPath();
		String node_cert = pki_path + "/" + cn + ".crt";
		String node_key = pki_path + "/" + cn + ".key";

		if (!Utility::MkDirP(pki_path, 0700)) {
			Log(LogCritical, "cli")
			    << "Could not create local pki directory '" << pki_path << "'.";
			return 1;
		}

		String user = ScriptGlobal::Get("RunAsUser");
		String group = ScriptGlobal::Get("RunAsGroup");

		if (!Utility::SetFileOwnership(pki_path, user, group)) {
			Log(LogWarning, "cli")
			    << "Cannot set ownership for user '" << user << "' group '" << group << "' on file '" << pki_path << "'. Verify it yourself!";
		}

		if (Utility::PathExists(node_key))
			NodeUtility::CreateBackupFile(node_key, true);
		if (Utility::PathExists(node_cert))
			NodeUtility::CreateBackupFile(node_cert);

		if (PkiUtility::NewCert(cn, node_key, Empty, node_cert) > 0) {
			Log(LogCritical, "cli")
			    << "Failed to create new self-signed certificate for CN '" << cn << "'. Please try again.";
			return 1;
		}

		/* fix permissions: root -> icinga daemon user */
		if (!Utility::SetFileOwnership(node_key, user, group)) {
			Log(LogWarning, "cli")
			    << "Cannot set ownership for user '" << user << "' group '" << group << "' on file '" << node_key << "'. Verify it yourself!";
		}

		//save-cert and store the master certificate somewhere

		Log(LogInformation, "cli", "Generating self-signed certifiate:");

		Log(LogInformation, "cli")
		    << "Fetching public certificate from master ("
		    << master_host << ", " << master_port << "):\n";

		String trusted_cert = PkiUtility::GetPkiPath() + "/trusted-master.crt";

		if (Utility::PathExists(trusted_cert))
			NodeUtility::CreateBackupFile(trusted_cert);

		if (PkiUtility::SaveCert(master_host, master_port, node_key, node_cert, trusted_cert) > 0) {
			Log(LogCritical, "cli")
			    << "Failed to fetch trusted master certificate. Please try again.";
			return 1;
		}

		Log(LogInformation, "cli")
		    << "Stored trusted master certificate in '" << trusted_cert << "'.\n";

wizard_ticket:
		std::cout << ConsoleColorTag(Console_Bold) << "Please specify the request ticket generated on your Icinga 2 master." << ConsoleColorTag(Console_Normal) << "\n"
		    << " (Hint: # icinga2 pki ticket --cn '" << cn << "'): ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty())
			goto wizard_ticket;

		String ticket = answer;
		ticket.Trim();

		Log(LogInformation, "cli")
		    << "Processing self-signed certificate request. Ticket '" << ticket << "'.\n";

		String target_ca = pki_path + "/ca.crt";

		if (Utility::PathExists(target_ca))
			NodeUtility::CreateBackupFile(target_ca);
		if (Utility::PathExists(node_cert))
			NodeUtility::CreateBackupFile(node_cert);

		if (PkiUtility::RequestCertificate(master_host, master_port, node_key, node_cert, target_ca, trusted_cert, ticket) > 0) {
			Log(LogCritical, "cli")
			    << "Failed to fetch signed certificate from master '" << master_host << ", "
			    << master_port <<"'. Please try again.";
			goto wizard_ticket;
		}

		/* fix permissions (again) when updating the signed certificate */
		if (!Utility::SetFileOwnership(node_cert, user, group)) {
			Log(LogWarning, "cli")
			    << "Cannot set ownership for user '" << user << "' group '" << group << "' on file '" << node_cert << "'. Verify it yourself!";
		}

		/* apilistener config */
		std::cout << ConsoleColorTag(Console_Bold) << "Please specify the API bind host/port" << ConsoleColorTag(Console_Normal) << " (optional):\n";
		std::cout << ConsoleColorTag(Console_Bold) << "Bind Host" << ConsoleColorTag(Console_Normal) << " []: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		String bind_host = answer;
		bind_host.Trim();

		std::cout << "Bind Port []: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		String bind_port = answer;
		bind_port.Trim();

		/* disable the notifications feature on client nodes */
		Log(LogInformation, "cli", "Disabling the Notification feature.");

		std::vector<std::string> disable;
		disable.push_back("notification");
		FeatureUtility::DisableFeatures(disable);

		Log(LogInformation, "cli", "Enabling the Apilistener feature.");

		std::vector<std::string> enable;
		enable.push_back("api");
		FeatureUtility::EnableFeatures(enable);

		String apipath = FeatureUtility::GetFeaturesAvailablePath() + "/api.conf";
		NodeUtility::CreateBackupFile(apipath);

		String apipathtmp = apipath + ".tmp";

		std::ofstream fp;
		fp.open(apipathtmp.CStr(), std::ofstream::out | std::ofstream::trunc);

		fp << "/**\n"
		    << " * The API listener is used for distributed monitoring setups.\n"
		    << " */\n"
		    << "object ApiListener \"api\" {\n"
		    << "  cert_path = SysconfDir + \"/icinga2/pki/\" + NodeName + \".crt\"\n"
		    << "  key_path = SysconfDir + \"/icinga2/pki/\" + NodeName + \".key\"\n"
		    << "  ca_path = SysconfDir + \"/icinga2/pki/ca.crt\"\n";

		if (!bind_host.IsEmpty())
			fp << "  bind_host = \"" << bind_host << "\"\n";
		if (!bind_port.IsEmpty())
			fp << "  bind_port = " << bind_port << "\n";

		fp << "\n"
		    << "  ticket_salt = TicketSalt\n"
		    << "}\n";

		fp.close();

#ifdef _WIN32
		_unlink(apipath.CStr());
#endif /* _WIN32 */

		if (rename(apipathtmp.CStr(), apipath.CStr()) < 0) {
			BOOST_THROW_EXCEPTION(posix_error()
			    << boost::errinfo_api_function("rename")
			    << boost::errinfo_errno(errno)
			    << boost::errinfo_file_name(apipathtmp));
		}

		/* apilistener config */
		Log(LogInformation, "cli", "Generating local zones.conf.");

		NodeUtility::GenerateNodeIcingaConfig(endpoints, cn, local_zone);

		if (cn != Utility::GetFQDN()) {
			Log(LogWarning, "cli")
			    << "CN '" << cn << "' does not match the default FQDN '" << Utility::GetFQDN() << "'. Requires update for NodeName constant in constants.conf!";
		}

		Log(LogInformation, "cli", "Updating constants.conf.");

		String constants_file = Application::GetSysconfDir() + "/icinga2/constants.conf";

		NodeUtility::CreateBackupFile(constants_file);

		NodeUtility::UpdateConstant("NodeName", cn);
		NodeUtility::UpdateConstant("ZoneName", local_zone);
	} else {
		/* master setup */
		std::cout << ConsoleColorTag(Console_Bold) << "Starting the Master setup routine...\n";

		/* CN */
		std::cout << ConsoleColorTag(Console_Bold) << "Please specifiy the common name" << ConsoleColorTag(Console_Normal) << " (CN) [" << Utility::GetFQDN() << "]: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		if (answer.empty())
			answer = Utility::GetFQDN();

		String cn = answer;
		cn.Trim();

		if (PkiUtility::NewCa() > 0) {
			Log(LogWarning, "cli", "Found CA, skipping and using the existing one.");
		}

		String pki_path = PkiUtility::GetPkiPath();

		if (!Utility::MkDirP(pki_path, 0700)) {
			Log(LogCritical, "cli")
			    << "Could not create local pki directory '" << pki_path << "'.";
			return 1;
		}

		String user = ScriptGlobal::Get("RunAsUser");
		String group = ScriptGlobal::Get("RunAsGroup");

		if (!Utility::SetFileOwnership(pki_path, user, group)) {
			Log(LogWarning, "cli")
			    << "Cannot set ownership for user '" << user << "' group '" << group << "' on file '" << pki_path << "'. Verify it yourself!";
		}

		String key = pki_path + "/" + cn + ".key";
		String csr = pki_path + "/" + cn + ".csr";

		Log(LogInformation, "cli")
		    << "Generating new CSR in '" << csr << "'.";

		if (Utility::PathExists(key))
			NodeUtility::CreateBackupFile(key, true);
		if (Utility::PathExists(csr))
			NodeUtility::CreateBackupFile(csr);

		if (PkiUtility::NewCert(cn, key, csr, "") > 0) {
			Log(LogCritical, "cli", "Failed to create certificate signing request.");
			return 1;
		}

		/* Sign the CSR with the CA key */
		String cert = pki_path + "/" + cn + ".crt";

		Log(LogInformation, "cli")
		    << "Signing CSR with CA and writing certificate to '" << cert << "'.";

		if (Utility::PathExists(cert))
			NodeUtility::CreateBackupFile(cert);

		if (PkiUtility::SignCsr(csr, cert) != 0) {
			Log(LogCritical, "cli", "Could not sign CSR.");
			return 1;
		}

		/* Copy CA certificate to /etc/icinga2/pki */

		String ca_path = PkiUtility::GetLocalCaPath();
		String ca = ca_path + "/ca.crt";
		String ca_key = ca_path + "/ca.key";
		String serial = ca_path + "/serial.txt";
		String target_ca = pki_path + "/ca.crt";

		Log(LogInformation, "cli")
		    << "Copying CA certificate to '" << target_ca << "'.";

		if (Utility::PathExists(target_ca))
			NodeUtility::CreateBackupFile(target_ca);

		/* does not overwrite existing files! */
		Utility::CopyFile(ca, target_ca);

		/* fix permissions: root -> icinga daemon user */
		std::vector<String> files;
		files.push_back(ca_path);
		files.push_back(ca);
		files.push_back(ca_key);
		files.push_back(serial);
		files.push_back(target_ca);
		files.push_back(key);
		files.push_back(csr);
		files.push_back(cert);

		BOOST_FOREACH(const String& file, files) {
			if (!Utility::SetFileOwnership(file, user, group)) {
				Log(LogWarning, "cli")
				    << "Cannot set ownership for user '" << user << "' group '" << group << "' on file '" << file << "'. Verify it yourself!";
			}
		}

		NodeUtility::GenerateNodeMasterIcingaConfig(cn);

		/* apilistener config */
		std::cout << ConsoleColorTag(Console_Bold) << "Please specify the API bind host/port (optional):\n";
		std::cout << ConsoleColorTag(Console_Bold) << "Bind Host" << ConsoleColorTag(Console_Normal) << " []: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		String bind_host = answer;
		bind_host.Trim();

		std::cout << ConsoleColorTag(Console_Bold) << "Bind Port" << ConsoleColorTag(Console_Normal) << " []: ";

		std::getline(std::cin, answer);
		boost::algorithm::to_lower(answer);

		String bind_port = answer;
		bind_port.Trim();

		Log(LogInformation, "cli", "Enabling the APIlistener feature.");

		std::vector<std::string> enable;
		enable.push_back("api");
		FeatureUtility::EnableFeatures(enable);

		String apipath = FeatureUtility::GetFeaturesAvailablePath() + "/api.conf";
		NodeUtility::CreateBackupFile(apipath);

		String apipathtmp = apipath + ".tmp";

		std::ofstream fp;
		fp.open(apipathtmp.CStr(), std::ofstream::out | std::ofstream::trunc);

		fp << "/**\n"
		    << " * The API listener is used for distributed monitoring setups.\n"
		    << " */\n"
		    << "object ApiListener \"api\" {\n"
		    << "  cert_path = SysconfDir + \"/icinga2/pki/\" + NodeName + \".crt\"\n"
		    << "  key_path = SysconfDir + \"/icinga2/pki/\" + NodeName + \".key\"\n"
		    << "  ca_path = SysconfDir + \"/icinga2/pki/ca.crt\"\n";

		if (!bind_host.IsEmpty())
			fp << "  bind_host = \"" << bind_host << "\"\n";
		if (!bind_port.IsEmpty())
			fp << "  bind_port = " << bind_port << "\n";

		fp << "\n"
		    << "  ticket_salt = TicketSalt\n"
		    << "}\n";

		fp.close();

#ifdef _WIN32
		_unlink(apipath.CStr());
#endif /* _WIN32 */

		if (rename(apipathtmp.CStr(), apipath.CStr()) < 0) {
			BOOST_THROW_EXCEPTION(posix_error()
			    << boost::errinfo_api_function("rename")
			    << boost::errinfo_errno(errno)
			    << boost::errinfo_file_name(apipathtmp));
		}

		/* update constants.conf with NodeName = CN + TicketSalt = random value */
		if (cn != Utility::GetFQDN()) {
			Log(LogWarning, "cli")
				<< "CN '" << cn << "' does not match the default FQDN '" << Utility::GetFQDN() << "'. Requires update for NodeName constant in constants.conf!";
		}

		Log(LogInformation, "cli", "Updating constants.conf.");

		String constants_file = Application::GetSysconfDir() + "/icinga2/constants.conf";

		NodeUtility::CreateBackupFile(constants_file);

		NodeUtility::UpdateConstant("NodeName", cn);

		String salt = RandomString(16);

		NodeUtility::UpdateConstant("TicketSalt", salt);

		std::cout << ConsoleColorTag(Console_Bold)
		    << "Please edit the constants.conf file '" << constants_file << "' and set a secure 'TicketSalt' constant." << ConsoleColorTag(Console_Normal) << "\n";
	}

	std::cout << "Done.\n\n";

	std::cout << "Now restart your Icinga 2 daemon to finish the installation!\n\n";

	return 0;
}