// Copyright 2018 The Grin Developers
//
// 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.

/// Grin server commands processing
use std::env::current_dir;
use std::process::exit;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::thread;
use std::time::Duration;

use clap::ArgMatches;
use ctrlc;
use daemonize::Daemonize;

use config::GlobalConfig;
use core::global;
use p2p::Seeding;
use servers;
use tui::ui;

/// wrap below to allow UI to clean up on stop
fn start_server(config: servers::ServerConfig) {
	start_server_tui(config);
	// Just kill process for now, otherwise the process
	// hangs around until sigint because the API server
	// currently has no shutdown facility
	warn!("Shutting down...");
	thread::sleep(Duration::from_millis(1000));
	warn!("Shutdown complete.");
	exit(0);
}

fn start_server_tui(config: servers::ServerConfig) {
	// Run the UI controller.. here for now for simplicity to access
	// everything it might need
	if config.run_tui.is_some() && config.run_tui.unwrap() {
		warn!("Starting GRIN in UI mode...");
		servers::Server::start(config, |serv: Arc<servers::Server>| {
			let running = Arc::new(AtomicBool::new(true));
			let _ = thread::Builder::new()
				.name("ui".to_string())
				.spawn(move || {
					let mut controller = ui::Controller::new().unwrap_or_else(|e| {
						panic!("Error loading UI controller: {}", e);
					});
					controller.run(serv.clone(), running);
				});
		}).unwrap();
	} else {
		warn!("Starting GRIN w/o UI...");
		servers::Server::start(config, |serv: Arc<servers::Server>| {
			let running = Arc::new(AtomicBool::new(true));
			let r = running.clone();
			ctrlc::set_handler(move || {
				r.store(false, Ordering::SeqCst);
			}).expect("Error setting handler for both SIGINT (Ctrl+C) and SIGTERM (kill)");
			while running.load(Ordering::SeqCst) {
				thread::sleep(Duration::from_secs(1));
			}
			warn!("Received SIGINT (Ctrl+C) or SIGTERM (kill).");
			serv.stop();
		}).unwrap();
	}
}

/// Handles the server part of the command line, mostly running, starting and
/// stopping the Grin blockchain server. Processes all the command line
/// arguments to build a proper configuration and runs Grin with that
/// configuration.
pub fn server_command(server_args: Option<&ArgMatches>, mut global_config: GlobalConfig) -> i32 {
	global::set_mining_mode(
		global_config
			.members
			.as_mut()
			.unwrap()
			.server
			.clone()
			.chain_type,
	);

	// just get defaults from the global config
	let mut server_config = global_config.members.as_ref().unwrap().server.clone();

	if let Some(a) = server_args {
		if let Some(port) = a.value_of("port") {
			server_config.p2p_config.port = port.parse().unwrap();
		}

		if let Some(api_port) = a.value_of("api_port") {
			let default_ip = "0.0.0.0";
			server_config.api_http_addr = format!("{}:{}", default_ip, api_port);
		}

		if let Some(wallet_url) = a.value_of("wallet_url") {
			server_config
				.stratum_mining_config
				.as_mut()
				.unwrap()
				.wallet_listener_url = wallet_url.to_string();
		}

		if let Some(seeds) = a.values_of("seed") {
			server_config.p2p_config.seeding_type = Seeding::List;
			server_config.p2p_config.seeds = Some(seeds.map(|s| s.to_string()).collect());
		}
	}

	/*if let Some(true) = server_config.run_wallet_listener {
		let mut wallet_config = global_config.members.as_ref().unwrap().wallet.clone();
		wallet::init_wallet_seed(wallet_config.clone());
		let wallet = wallet::instantiate_wallet(wallet_config.clone(), "");

		let _ = thread::Builder::new()
			.name("wallet_listener".to_string())
			.spawn(move || {
				controller::foreign_listener(wallet, &wallet_config.api_listen_addr())
					.unwrap_or_else(|e| {
						panic!(
							"Error creating wallet listener: {:?} Config: {:?}",
							e, wallet_config
						)
					});
			});
	}
	if let Some(true) = server_config.run_wallet_owner_api {
		let mut wallet_config = global_config.members.unwrap().wallet;
		let wallet = wallet::instantiate_wallet(wallet_config.clone(), "");
		wallet::init_wallet_seed(wallet_config.clone());

		let _ = thread::Builder::new()
			.name("wallet_owner_listener".to_string())
			.spawn(move || {
				controller::owner_listener(wallet, "127.0.0.1:13420").unwrap_or_else(|e| {
					panic!(
						"Error creating wallet api listener: {:?} Config: {:?}",
						e, wallet_config
					)
				});
			});
	}*/

	// start the server in the different run modes (interactive or daemon)
	if let Some(a) = server_args {
		match a.subcommand() {
			("run", _) => {
				start_server(server_config);
			}
			("start", _) => {
				let daemonize = Daemonize::new()
					.pid_file("/tmp/grin.pid")
					.chown_pid_file(true)
					.working_directory(current_dir().unwrap())
					.privileged_action(move || {
						start_server(server_config.clone());
						loop {
							thread::sleep(Duration::from_secs(60));
						}
					});
				match daemonize.start() {
					Ok(_) => info!("Grin server successfully started."),
					Err(e) => error!("Error starting: {}", e),
				}
			}
			("stop", _) => println!("TODO. Just 'kill $pid' for now. Maybe /tmp/grin.pid is $pid"),
			("", _) => {
				println!("Subcommand required, use 'grin help server' for details");
			}
			(cmd, _) => {
				println!(":: {:?}", server_args);
				panic!(
					"Unknown server command '{}', use 'grin help server' for details",
					cmd
				);
			}
		}
	} else {
		start_server(server_config);
	}
	0
}