// Gupax - GUI Uniting P2Pool And XMRig
//
// Copyright (c) 2022-2023 hinto-janai
//
// 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 <https://www.gnu.org/licenses/>.

use crate::{
	constants::*,
	macros::*,
};
use serde::{Serialize,Deserialize};
use rand::{thread_rng, Rng};
use std::time::{Instant,Duration};
use std::sync::{Arc,Mutex};
use egui::Color32;
use log::*;
use hyper::{
	client::HttpConnector,
	Client,Body,Request,
};

//---------------------------------------------------------------------------------------------------- Node list
// Remote Monero Nodes with ZMQ enabled, sourced from: [https://github.com/hinto-janai/monero-nodes]
// The format is an array of tuples consisting of: (IP, LOCATION, RPC_PORT, ZMQ_PORT)

pub const REMOTE_NODES: [(&str, &str, &str, &str); 24] = [
	("monero.10z.com.ar",           "AR - Buenos Aires F.D.",         "18089", "18084"),
	("escom.sadovo.com",            "BG - Plovdiv",                   "18089", "18084"),
	("monero2.10z.com.ar",          "BR - São Paulo",                 "18089", "18083"),
	("monero1.heitechsoft.com",     "CA - Ontario",                   "18081", "18084"),
	("node.monerodevs.org",         "CA - Quebec",                    "18089", "18084"),
	("xmr.aa78i2efsewr0neeknk.xyz", "DE - Bavaria",                   "18089", "18083"),
	("de.poiuty.com",               "DE - Berlin",                    "18081", "18084"),
	("m1.poiuty.com",               "DE - Berlin",                    "18081", "18084"),
	("p2pmd.xmrvsbeast.com",        "DE - Hesse",                     "18081", "18083"),
	("reynald.ro",                  "FR - Île-de-France",             "18089", "18084"),
	("node2.monerodevs.org",        "FR - Occitanie",                 "18089", "18084"),
	("p2pool.uk",                   "GB - England",                   "18089", "18084"),
	("monero.homeqloud.com",        "GR - East Macedonia and Thrace", "18089", "18083"),
	("home.allantaylor.kiwi",       "NZ - Canterbury",                "18089", "18083"),
	("ru.poiuty.com",               "RU - Kuzbass",                   "18081", "18084"),
	("node-01-xmr.godevs.cloud",    "SG - Singapore",                 "18089", "18083"),
	("node-02-xmr.godevs.cloud",    "SG - Singapore",                 "18089", "18083"),
	("radishfields.hopto.org",      "US - Colorado",                  "18081", "18084"),
	("xmrbandwagon.hopto.org",      "US - Colorado",                  "18081", "18084"),
	("xmr.spotlightsound.com",      "US - Kansas",                    "18081", "18084"),
	("xmrnode.facspro.net",         "US - Nebraska",                  "18089", "18084"),
	("moneronode.ddns.net",         "US - Pennsylvania",              "18089", "18084"),
	("node.richfowler.net",         "US - Pennsylvania",              "18089", "18084"),
	("monero.jameswillhoite.com",   "US - Ohio",                      "18089", "18084"),
];

pub const REMOTE_NODE_LENGTH: usize = REMOTE_NODES.len();
pub const REMOTE_NODE_MAX_CHARS: usize = 28; // xmr.aa78i2efsewr0neeknk.xyz

pub struct RemoteNode {
	pub ip: &'static str,
	pub location: &'static str,
	pub rpc: &'static str,
	pub zmq: &'static str,
}

impl Default for RemoteNode {
	fn default() -> Self {
		Self::new()
	}
}

impl RemoteNode {
	pub fn new() -> Self {
		let (ip, location, rpc, zmq) = REMOTE_NODES[0];
		Self {
			ip,
			location,
			rpc,
			zmq,
		}
	}

	pub fn check_exists(og_ip: &str) -> String {
		for (ip, _, _, _) in REMOTE_NODES {
			if og_ip == ip {
				info!("Found remote node in array: {}", ip);
				return ip.to_string()
			}
		}
		let ip = REMOTE_NODES[0].0.to_string();
		warn!("[{}] remote node does not exist, returning default: {}", og_ip, ip);
		ip
	}

	// Returns a default if IP is not found.
	pub fn from_ip(from_ip: &str) -> Self {
		for (ip, location, rpc, zmq) in REMOTE_NODES {
			if from_ip == ip {
				return Self { ip, location, rpc, zmq }
			}
		}
		Self::new()
	}

	// Returns a default if index is not found in the const array.
	pub fn from_index(index: usize) -> Self {
		if index > REMOTE_NODE_LENGTH {
			Self::new()
		} else {
			let (ip, location, rpc, zmq) = REMOTE_NODES[index];
			Self { ip, location, rpc, zmq }
		}
	}

	pub fn from_tuple(t: (&'static str, &'static str, &'static str, &'static str)) -> Self {
		let (ip, location, rpc, zmq) = (t.0, t.1, t.2, t.3);
		Self { ip, location, rpc, zmq }
	}

	pub fn get_ip_rpc_zmq(og_ip: &str) -> (&str, &str, &str) {
		for (ip, _, rpc, zmq) in REMOTE_NODES {
			if og_ip == ip { return (ip, rpc, zmq) }
		}
		let (ip, _, rpc, zmq) = REMOTE_NODES[0];
		(ip, rpc, zmq)
	}

	// Return a random node (that isn't the one already selected).
	pub fn get_random(current_ip: &str) -> String {
		let mut rng = thread_rng().gen_range(0..REMOTE_NODE_LENGTH);
		let mut node = REMOTE_NODES[rng].0;
		while current_ip == node {
			rng = thread_rng().gen_range(0..REMOTE_NODE_LENGTH);
			node = REMOTE_NODES[rng].0;
		}
		node.to_string()
	}

	// Return the node [-1] of this one
	pub fn get_last(current_ip: &str) -> String {
		let mut found = false;
		let mut last = current_ip;
		for (ip, _, _, _) in REMOTE_NODES {
			if found { return ip.to_string() }
			if current_ip == ip { found = true; } else { last = ip; }
		}
		last.to_string()
	}

	// Return the node [+1] of this one
	pub fn get_next(current_ip: &str) -> String {
		let mut found = false;
		for (ip, _, _, _) in REMOTE_NODES {
			if found { return ip.to_string() }
			if current_ip == ip { found = true; }
		}
		current_ip.to_string()
	}

	// This returns relative to the ping.
	pub fn get_last_from_ping(current_ip: &str, nodes: &Vec<NodeData>) -> String {
		let mut found = false;
		let mut last = current_ip;
		for data in nodes {
			if found { return last.to_string() }
			if current_ip == data.ip { found = true; } else { last = data.ip; }
		}
		last.to_string()
	}

	pub fn get_next_from_ping(current_ip: &str, nodes: &Vec<NodeData>) -> String {
		let mut found = false;
		for data in nodes {
			if found { return data.ip.to_string() }
			if current_ip == data.ip { found = true; }
		}
		current_ip.to_string()
	}
}

impl std::fmt::Display for RemoteNode {
	fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
		write!(f, "{:#?}", self.ip)
	}
}

//---------------------------------------------------------------------------------------------------- Formatting
// 5000 = 4 max length
pub fn format_ms(ms: u128) -> String {
	match ms.to_string().len() {
		1 => format!("{}ms   ", ms),
		2 => format!("{}ms  ", ms),
		3 => format!("{}ms ", ms),
		_ => format!("{}ms", ms),
	}
}

// format_ip_location(monero1.heitechsoft.com) -> "monero1.heitechsoft.com | XX - LOCATION"
// [extra_space] controls whether extra space is appended so the list aligns.
pub fn format_ip_location(og_ip: &str, extra_space: bool) -> String {
	for (ip, location, _, _) in REMOTE_NODES {
		if og_ip == ip {
			let ip = if extra_space { format_ip(ip) } else { ip.to_string() };
			return format!("{} | {}", ip, location)
		}
	}
	"??? | ???".to_string()
}

pub fn format_ip(ip: &str) -> String {
	format!("{: >28}", ip)
}

//---------------------------------------------------------------------------------------------------- Node data
#[derive(Debug, Clone)]
pub struct NodeData {
	pub ip: &'static str,
	pub ms: u128,
	pub color: Color32,
}

impl NodeData {
	pub fn new_vec() -> Vec<Self> {
		let mut vec = Vec::new();
		for (ip, _, _, _) in REMOTE_NODES {
			vec.push(Self {
				ip,
				ms: 0,
				color: Color32::LIGHT_GRAY,
			});
		}
		vec
	}
}

//---------------------------------------------------------------------------------------------------- Ping data
#[derive(Debug)]
pub struct Ping {
	pub nodes: Vec<NodeData>,
	pub fastest: &'static str,
	pub pinging: bool,
	pub msg: String,
	pub prog: f32,
	pub pinged: bool,
	pub auto_selected: bool,
}

impl Default for Ping {
	fn default() -> Self {
		Self::new()
	}
}

impl Ping {
	pub fn new() -> Self {
		Self {
			nodes: NodeData::new_vec(),
			fastest: REMOTE_NODES[0].0,
			pinging: false,
			msg: "No ping in progress".to_string(),
			prog: 0.0,
			pinged: false,
			auto_selected: true,
		}
	}

	//---------------------------------------------------------------------------------------------------- Main Ping function
	// Intermediate function for spawning thread
	pub fn spawn_thread(ping: &Arc<Mutex<Self>>) {
		info!("Spawning ping thread...");
		let ping = Arc::clone(ping);
		std::thread::spawn(move|| {
			let now = Instant::now();
			match Self::ping(&ping) {
				Ok(msg) => {
					info!("Ping ... OK");
					lock!(ping).msg = msg;
					lock!(ping).pinged = true;
					lock!(ping).auto_selected = false;
					lock!(ping).prog = 100.0;
				},
				Err(err) => {
					error!("Ping ... FAIL ... {}", err);
					lock!(ping).pinged = false;
					lock!(ping).msg = err.to_string();
				},
			}
			info!("Ping ... Took [{}] seconds...", now.elapsed().as_secs_f32());
			lock!(ping).pinging = false;
		});
	}

	// This is for pinging the remote nodes to
	// find the fastest/slowest one for the user.
	// The process:
	//   - Send [get_info] JSON-RPC request over HTTP to all IPs
	//   - Measure each request in milliseconds
	//   - Timeout on requests over 5 seconds
	//   - Add data to appropriate struct
	//   - Sorting fastest to lowest is automatic (fastest nodes return ... the fastest)
	//
	// This used to be done 3x linearly but after testing, sending a single
	// JSON-RPC call to all IPs asynchronously resulted in the same data.
	//
	// <300ms  = GREEN
	// >300ms = YELLOW
	// >500ms = RED
	// timeout = BLACK
	// default = GRAY
	#[tokio::main]
	pub async fn ping(ping: &Arc<Mutex<Self>>) -> Result<String, anyhow::Error> {
		// Start ping
		let ping = Arc::clone(ping);
		lock!(ping).pinging = true;
		lock!(ping).prog = 0.0;
		let percent = (100.0 / (REMOTE_NODE_LENGTH as f32)).floor();

		// Create HTTP client
		let info = "Creating HTTP Client".to_string();
		lock!(ping).msg = info;
		let client: Client<HttpConnector> = Client::builder()
			.build(HttpConnector::new());

		// Random User Agent
		let rand_user_agent = crate::Pkg::get_user_agent();
		// Handle vector
		let mut handles = Vec::with_capacity(REMOTE_NODE_LENGTH);
		let node_vec = arc_mut!(Vec::with_capacity(REMOTE_NODE_LENGTH));

		for (ip, _, rpc, zmq) in REMOTE_NODES {
			let client = client.clone();
			let ping = Arc::clone(&ping);
			let node_vec = Arc::clone(&node_vec);
			let request = Request::builder()
				.method("POST")
				.uri("http://".to_string() + ip + ":" + rpc + "/json_rpc")
				.header("User-Agent", rand_user_agent)
				.body(hyper::Body::from(r#"{"jsonrpc":"2.0","id":"0","method":"get_info"}"#))
				.unwrap();
			let handle = tokio::task::spawn(async move { Self::response(client, request, ip, ping, percent, node_vec).await; });
			handles.push(handle);
		}

		for handle in handles {
			handle.await?;
		}

		let node_vec = std::mem::take(&mut *lock!(node_vec));
		let fastest_info = format!("Fastest node: {}ms ... {}", node_vec[0].ms, node_vec[0].ip);

		let info = "Cleaning up connections".to_string();
		info!("Ping | {}...", info);
		let mut ping = lock!(ping);
			ping.fastest = node_vec[0].ip;
			ping.nodes = node_vec;
			ping.msg = info;
			drop(ping);
		Ok(fastest_info)
	}

	async fn response(client: Client<HttpConnector>, request: Request<Body>, ip: &'static str, ping: Arc<Mutex<Self>>, percent: f32, node_vec: Arc<Mutex<Vec<NodeData>>>) {
		let ms;
		let info;
		let now = Instant::now();
		match tokio::time::timeout(Duration::from_secs(5), client.request(request)).await {
			Ok(_) => {
				ms = now.elapsed().as_millis();
				info = format!("{}ms ... {}", ms, ip);
				info!("Ping | {}", info)
			},
			Err(_) => {
				ms = 5000;
				info = format!("{}ms ... {}", ms, ip);
				warn!("Ping | {}", info)
			},
		};
		let color;
		if ms < 300 {
			color = GREEN;
		} else if ms < 500 {
			color = YELLOW;
		} else if ms < 5000 {
			color = RED;
		} else {
			color = BLACK;
		}
		let mut ping = lock!(ping);
		ping.msg = info;
		ping.prog += percent;
		drop(ping);
		lock!(node_vec).push(NodeData { ip, ms, color, });
	}
}

//---------------------------------------------------------------------------------------------------- TESTS
#[cfg(test)]
mod test {
	#[test]
	fn validate_node_ips() {
		for (ip, location, rpc, zmq) in crate::REMOTE_NODES {
			assert!(ip.len() < 255);
			assert!(ip.is_ascii());
			assert!(!location.is_empty());
			assert!(!ip.is_empty());
			assert!(rpc == "18081" || rpc == "18089");
			assert!(zmq == "18083" || zmq == "18084");
		}
	}

	#[test]
	fn spacing() {
		for (ip, _, _, _) in crate::REMOTE_NODES {
			assert!(crate::format_ip(ip).len() == crate::REMOTE_NODE_MAX_CHARS);
		}
	}

	// This one pings the IPs defined in [REMOTE_NODES] and fully serializes the JSON data to make sure they work.
	// This will only be ran with be ran with [cargo test -- --ignored].
	#[tokio::test]
	#[ignore]
	async fn full_ping() {
		use hyper::{
			client::HttpConnector,
			Client,Body,Request,
		};
		use crate::{REMOTE_NODES,REMOTE_NODE_LENGTH};
		use serde::{Serialize,Deserialize};

		#[derive(Deserialize,Serialize)]
		struct GetInfo {
			id: String,
			jsonrpc: String,
		}

		// Create HTTP client
		let client: Client<HttpConnector> = Client::builder().build(HttpConnector::new());

		// Random User Agent
		let rand_user_agent = crate::Pkg::get_user_agent();

		let mut n = 1;
		for (ip, _, rpc, zmq) in REMOTE_NODES {
			println!("[{}/{}] {} | {} | {}", n, REMOTE_NODE_LENGTH, ip, rpc, zmq);
			let client = client.clone();
			// Try 5 times before failure
			let mut i = 1;
			let mut response = loop {
				let request = Request::builder()
					.method("POST")
					.uri("http://".to_string() + ip + ":" + rpc + "/json_rpc")
					.header("User-Agent", rand_user_agent)
					.body(hyper::Body::from(r#"{"jsonrpc":"2.0","id":"0","method":"get_info"}"#))
					.unwrap();
				match client.request(request).await {
					Ok(response) => break response,
					Err(e) => {
						println!("{:#?}", e);
						if i > 5 { panic!("Node failure: {}:{}:{}", ip, rpc, zmq); }
						std::thread::sleep(std::time::Duration::from_secs(3));
						i += 1;
					}
				}
			};
			let body = hyper::body::to_bytes(response.body_mut()).await.unwrap();
			let getinfo: GetInfo = serde_json::from_slice(&body).unwrap();
			assert!(getinfo.id == "0");
			assert!(getinfo.jsonrpc == "2.0");
			n += 1;
		}
	}
}