// Copyright 2021 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.

//! Main for building the binary of a Grin peer-to-peer node.

#[macro_use]
extern crate clap;

#[macro_use]
extern crate log;
use crate::config::config::SERVER_CONFIG_FILE_NAME;
use crate::core::global;
use crate::tools::check_seeds;
use crate::util::init_logger;
use clap::App;
use futures::channel::oneshot;
use grin_api as api;
use grin_chain as chain;
use grin_config as config;
use grin_core as core;
use grin_p2p as p2p;
use grin_servers as servers;
use grin_util as util;
use grin_util::logger::LogEntry;
use std::fs::File;
use std::io::Write;
use std::sync::mpsc;

#[macro_use]
extern crate serde_derive;
extern crate serde_json;

mod cmd;
mod tools;
pub mod tui;

// include build information
pub mod built_info {
	include!(concat!(env!("OUT_DIR"), "/built.rs"));
}

pub fn info_strings() -> (String, String) {
	(
		format!(
			"This is Grin version {}{}, built for {} by {}.",
			built_info::PKG_VERSION,
			built_info::GIT_COMMIT_HASH.map_or_else(|| "".to_owned(), |v| format!(" (git {})", v)),
			built_info::TARGET,
			built_info::RUSTC_VERSION,
		),
		format!(
			"Built with profile \"{}\", features \"{}\".",
			built_info::PROFILE,
			built_info::FEATURES_STR,
		),
	)
}

fn log_build_info() {
	let (basic_info, detailed_info) = info_strings();
	info!("{}", basic_info);
	debug!("{}", detailed_info);
}

fn log_feature_flags() {
	info!("Feature: NRD kernel enabled: {}", global::is_nrd_enabled());
}

fn main() {
	let exit_code = real_main();
	std::process::exit(exit_code);
}

fn real_main() -> i32 {
	let yml = load_yaml!("grin.yml");
	let args = App::from_yaml(yml)
		.version(built_info::PKG_VERSION)
		.get_matches();
	let mut node_config;

	let chain_type = if args.is_present("testnet") {
		global::ChainTypes::Testnet
	} else if args.is_present("usernet") {
		global::ChainTypes::UserTesting
	} else {
		global::ChainTypes::Mainnet
	};

	// Deal with configuration file creation
	if let ("server", Some(server_args)) = args.subcommand() {
		// If it's just a server config command, do it and exit
		if let ("config", Some(_)) = server_args.subcommand() {
			cmd::config_command_server(&chain_type, SERVER_CONFIG_FILE_NAME);
			return 0;
		}
	}

	// Load relevant config
	match args.subcommand() {
		// When the subscommand is 'server' take into account the 'config_file' flag
		("server", Some(server_args)) => {
			if let Some(_path) = server_args.value_of("config_file") {
				node_config = Some(config::GlobalConfig::new(_path).unwrap_or_else(|e| {
					panic!("Error loading server configuration: {}", e);
				}));
			} else {
				node_config = Some(
					config::initial_setup_server(&chain_type).unwrap_or_else(|e| {
						panic!("Error loading server configuration: {}", e);
					}),
				);
			}
		}
		// Otherwise load up the node config as usual
		_ => {
			node_config = Some(
				config::initial_setup_server(&chain_type).unwrap_or_else(|e| {
					panic!("Error loading server configuration: {}", e);
				}),
			);
		}
	}

	let config = node_config.clone().unwrap();
	let mut logging_config = config.members.as_ref().unwrap().logging.clone().unwrap();
	logging_config.tui_running = config.members.as_ref().unwrap().server.run_tui;

	// Handle global --no-tui flag and GRIN_NO_TUI environment variable
	let no_tui = args.is_present("no-tui")
		|| std::env::var("GRIN_NO_TUI")
			.map(|v| v == "1" || v.eq_ignore_ascii_case("true"))
			.unwrap_or(false);

	if no_tui {
		// Deactivate logger TUI
		logging_config.tui_running = Some(false);

		// Deactivate Server TUI in node config, so
		// cmd::server_command(...) will not use it
		if let Some(gc) = node_config.as_mut() {
			if let Some(members) = gc.members.as_mut() {
				members.server.run_tui = Some(false);
			}
		}
	}

	let api_chan: &'static mut (oneshot::Sender<()>, oneshot::Receiver<()>) =
		Box::leak(Box::new(oneshot::channel::<()>()));

	let (logs_tx, logs_rx) = if logging_config.tui_running.unwrap() {
		let (logs_tx, logs_rx) = mpsc::sync_channel::<LogEntry>(200);
		(Some(logs_tx), Some(logs_rx))
	} else {
		(None, None)
	};
	init_logger(Some(logging_config), logs_tx);

	if let Some(file_path) = &config.config_file_path {
		info!(
			"Using configuration file at {}",
			file_path.to_str().unwrap()
		);
	} else {
		info!("Node configuration file not found, using default");
	};

	log_build_info();

	// Initialize our global chain_type, feature flags (NRD kernel support currently), accept_fee_base, and future_time_limit.
	// These are read via global and not read from config beyond this point.
	global::init_global_chain_type(config.members.as_ref().unwrap().server.chain_type);
	info!("Chain: {:?}", global::get_chain_type());
	match global::get_chain_type() {
		global::ChainTypes::Mainnet => {
			// Set various mainnet specific feature flags.
			global::init_global_nrd_enabled(false);
		}
		_ => {
			// Set various non-mainnet feature flags.
			global::init_global_nrd_enabled(true);
		}
	}
	let afb = config
		.members
		.as_ref()
		.unwrap()
		.server
		.pool_config
		.accept_fee_base;
	global::init_global_accept_fee_base(afb);
	info!("Accept Fee Base: {:?}", global::get_accept_fee_base());
	global::init_global_future_time_limit(config.members.unwrap().server.future_time_limit);
	info!("Future Time Limit: {:?}", global::get_future_time_limit());
	log_feature_flags();

	// Execute subcommand
	match args.subcommand() {
		// server commands and options
		("server", Some(server_args)) => {
			cmd::server_command(Some(server_args), node_config.unwrap(), logs_rx, api_chan)
		}

		// client commands and options
		("client", Some(client_args)) => cmd::client_command(client_args, node_config.unwrap()),

		// clean command
		("clean", _) => {
			let db_root_path = node_config.unwrap().members.unwrap().server.db_root;
			println!("Cleaning chain data directory: {}", db_root_path);
			match std::fs::remove_dir_all(db_root_path) {
				Ok(_) => 0,
				Err(_) => 1,
			}
		}

		// seedcheck command
		("seedcheck", Some(seedcheck_args)) => {
			let is_testnet = seedcheck_args.is_present("testnet");
			let results = check_seeds(is_testnet);
			let output =
				serde_json::to_string_pretty(&results).expect("Unable to serialize results");

			if let Some(output_file) = seedcheck_args.value_of("output") {
				let mut file = File::create(output_file).expect("Unable to create file");
				writeln!(file, "{}", output).expect("Unable to write data");
				println!("Results written to {}", output_file);
			} else {
				println!("{}", output);
			}
			0
		}

		// If nothing is specified, try to just use the config file instead
		// this could possibly become the way to configure most things
		// with most command line options being phased out
		_ => cmd::server_command(None, node_config.unwrap(), logs_rx, api_chan),
	}
}