use std::{
	error::Error,
	fmt::Display,
	net::IpAddr,
	path::{Path, PathBuf},
	str::FromStr,
};

use multiaddr::Multiaddr;
use serde::{Deserialize, Serialize};

use crate::{
	shared::{
		errors::{ConfigError, FieldError},
		helpers::{merge_errors, merge_errors_vecs},
		types::Duration,
	},
	utils::{default_as_true, default_node_spawn_timeout, default_timeout},
};

/// Global settings applied to an entire network.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct GlobalSettings {
	/// Global bootnodes to use (we will then add more)
	#[serde(skip_serializing_if = "std::vec::Vec::is_empty", default)]
	bootnodes_addresses: Vec<Multiaddr>,
	// TODO: parse both case in zombienet node version to avoid renamed ?
	/// Global spawn timeout
	#[serde(rename = "timeout", default = "default_timeout")]
	network_spawn_timeout: Duration,
	// TODO: not used yet
	/// Node spawn timeout
	#[serde(default = "default_node_spawn_timeout")]
	node_spawn_timeout: Duration,
	// TODO: not used yet
	/// Local ip to use for construct the direct links
	local_ip: Option<IpAddr>,
	/// Directory to use as base dir
	/// Used to reuse the same files (database) from a previous run,
	/// also note that we will override the content of some of those files.
	base_dir: Option<PathBuf>,
	/// Number of concurrent spawning process to launch, None means try to spawn all at the same time.
	spawn_concurrency: Option<usize>,
	/// If enabled, will launch a task to monitor nodes' liveness and tear down the network if there are any.
	#[serde(default = "default_as_true")]
	tear_down_on_failure: bool,
}

impl GlobalSettings {
	/// External bootnode address.
	pub fn bootnodes_addresses(&self) -> Vec<&Multiaddr> {
		self.bootnodes_addresses.iter().collect()
	}

	/// Global spawn timeout in seconds.
	pub fn network_spawn_timeout(&self) -> Duration {
		self.network_spawn_timeout
	}

	/// Individual node spawn timeout in seconds.
	pub fn node_spawn_timeout(&self) -> Duration {
		self.node_spawn_timeout
	}

	/// Local IP used to expose local services (including RPC, metrics and monitoring).
	pub fn local_ip(&self) -> Option<&IpAddr> {
		self.local_ip.as_ref()
	}

	/// Base directory to use (instead a random tmp one)
	/// All the artifacts will be created in this directory.
	pub fn base_dir(&self) -> Option<&Path> {
		self.base_dir.as_deref()
	}

	/// Number of concurrent spawning process to launch
	pub fn spawn_concurrency(&self) -> Option<usize> {
		self.spawn_concurrency
	}

	/// A flag to tear down the network if there are any unresponsive nodes detected.
	pub fn tear_down_on_failure(&self) -> bool {
		self.tear_down_on_failure
	}
}

impl Default for GlobalSettings {
	fn default() -> Self {
		Self {
			bootnodes_addresses: Default::default(),
			network_spawn_timeout: default_timeout(),
			node_spawn_timeout: default_node_spawn_timeout(),
			local_ip: Default::default(),
			base_dir: Default::default(),
			spawn_concurrency: Default::default(),
			tear_down_on_failure: true,
		}
	}
}

/// A global settings builder, used to build [`GlobalSettings`] declaratively with fields validation.
#[derive(Default)]
pub struct GlobalSettingsBuilder {
	config: GlobalSettings,
	errors: Vec<anyhow::Error>,
}

impl GlobalSettingsBuilder {
	pub fn new() -> Self {
		Self::default()
	}

	// Transition to the next state of the builder.
	fn transition(config: GlobalSettings, errors: Vec<anyhow::Error>) -> Self {
		Self { config, errors }
	}

	/// Set the external bootnode address.
	///
	/// Note: Bootnode address replacements are NOT supported here.
	/// Only arguments (`args`) support dynamic replacements. Bootnode addresses must be a valid address.
	pub fn with_raw_bootnodes_addresses<T>(self, bootnodes_addresses: Vec<T>) -> Self
	where
		T: TryInto<Multiaddr> + Display + Copy,
		T::Error: Error + Send + Sync + 'static,
	{
		let mut addrs = vec![];
		let mut errors = vec![];

		for (index, addr) in bootnodes_addresses.into_iter().enumerate() {
			match addr.try_into() {
				Ok(addr) => addrs.push(addr),
				Err(error) => errors.push(
					FieldError::BootnodesAddress(index, addr.to_string(), error.into()).into(),
				),
			}
		}

		Self::transition(
			GlobalSettings { bootnodes_addresses: addrs, ..self.config },
			merge_errors_vecs(self.errors, errors),
		)
	}

	/// Set global spawn timeout in seconds.
	pub fn with_network_spawn_timeout(self, timeout: Duration) -> Self {
		Self::transition(
			GlobalSettings { network_spawn_timeout: timeout, ..self.config },
			self.errors,
		)
	}

	/// Set individual node spawn timeout in seconds.
	pub fn with_node_spawn_timeout(self, timeout: Duration) -> Self {
		Self::transition(GlobalSettings { node_spawn_timeout: timeout, ..self.config }, self.errors)
	}

	/// Set local IP used to expose local services (including RPC, metrics and monitoring).
	pub fn with_local_ip(self, local_ip: &str) -> Self {
		match IpAddr::from_str(local_ip) {
			Ok(local_ip) => Self::transition(
				GlobalSettings { local_ip: Some(local_ip), ..self.config },
				self.errors,
			),
			Err(error) => Self::transition(
				self.config,
				merge_errors(self.errors, FieldError::LocalIp(error.into()).into()),
			),
		}
	}

	/// Set the directory to use as base (instead of a random tmp one).
	pub fn with_base_dir(self, base_dir: impl Into<PathBuf>) -> Self {
		Self::transition(
			GlobalSettings { base_dir: Some(base_dir.into()), ..self.config },
			self.errors,
		)
	}

	/// Set the spawn concurrency
	pub fn with_spawn_concurrency(self, spawn_concurrency: usize) -> Self {
		Self::transition(
			GlobalSettings { spawn_concurrency: Some(spawn_concurrency), ..self.config },
			self.errors,
		)
	}

	/// Set the `tear_down_on_failure` flag
	pub fn with_tear_down_on_failure(self, tear_down_on_failure: bool) -> Self {
		Self::transition(GlobalSettings { tear_down_on_failure, ..self.config }, self.errors)
	}

	/// Seals the builder and returns a [`GlobalSettings`] if there are no validation errors, else returns errors.
	pub fn build(self) -> Result<GlobalSettings, Vec<anyhow::Error>> {
		if !self.errors.is_empty() {
			return Err(self
				.errors
				.into_iter()
				.map(|error| ConfigError::GlobalSettings(error).into())
				.collect::<Vec<_>>());
		}

		Ok(self.config)
	}
}

#[cfg(test)]
mod tests {
	use super::*;

	#[test]
	fn global_settings_config_builder_should_succeeds_and_returns_a_global_settings_config() {
		let global_settings_config = GlobalSettingsBuilder::new()
			.with_raw_bootnodes_addresses(vec![
				"/ip4/10.41.122.55/tcp/45421",
				"/ip4/51.144.222.10/tcp/2333",
			])
			.with_network_spawn_timeout(600)
			.with_node_spawn_timeout(120)
			.with_local_ip("10.0.0.1")
			.with_base_dir("/home/nonroot/mynetwork")
			.with_spawn_concurrency(5)
			.with_tear_down_on_failure(true)
			.build()
			.unwrap();

		let bootnodes_addresses: Vec<Multiaddr> = vec![
			"/ip4/10.41.122.55/tcp/45421".try_into().unwrap(),
			"/ip4/51.144.222.10/tcp/2333".try_into().unwrap(),
		];
		assert_eq!(
			global_settings_config.bootnodes_addresses(),
			bootnodes_addresses.iter().collect::<Vec<_>>()
		);
		assert_eq!(global_settings_config.network_spawn_timeout(), 600);
		assert_eq!(global_settings_config.node_spawn_timeout(), 120);
		assert_eq!(global_settings_config.local_ip().unwrap().to_string().as_str(), "10.0.0.1");
		assert_eq!(
			global_settings_config.base_dir().unwrap(),
			Path::new("/home/nonroot/mynetwork")
		);
		assert_eq!(global_settings_config.spawn_concurrency().unwrap(), 5);
		assert!(global_settings_config.tear_down_on_failure());
	}

	#[test]
	fn global_settings_config_builder_should_succeeds_when_node_spawn_timeout_is_missing() {
		let global_settings_config = GlobalSettingsBuilder::new()
			.with_raw_bootnodes_addresses(vec![
				"/ip4/10.41.122.55/tcp/45421",
				"/ip4/51.144.222.10/tcp/2333",
			])
			.with_network_spawn_timeout(600)
			.with_local_ip("10.0.0.1")
			.build()
			.unwrap();

		let bootnodes_addresses: Vec<Multiaddr> = vec![
			"/ip4/10.41.122.55/tcp/45421".try_into().unwrap(),
			"/ip4/51.144.222.10/tcp/2333".try_into().unwrap(),
		];
		assert_eq!(
			global_settings_config.bootnodes_addresses(),
			bootnodes_addresses.iter().collect::<Vec<_>>()
		);
		assert_eq!(global_settings_config.network_spawn_timeout(), 600);
		assert_eq!(global_settings_config.node_spawn_timeout(), 600);
		assert_eq!(global_settings_config.local_ip().unwrap().to_string().as_str(), "10.0.0.1");
	}

	#[test]
	fn global_settings_builder_should_fails_and_returns_an_error_if_one_bootnode_address_is_invalid(
	) {
		let errors = GlobalSettingsBuilder::new()
			.with_raw_bootnodes_addresses(vec!["/ip4//tcp/45421"])
			.build()
			.unwrap_err();

		assert_eq!(errors.len(), 1);
		assert_eq!(
            errors.first().unwrap().to_string(),
            "global_settings.bootnodes_addresses[0]: '/ip4//tcp/45421' failed to parse: invalid IPv4 address syntax"
        );
	}

	#[test]
	fn global_settings_builder_should_fails_and_returns_multiple_errors_if_multiple_bootnodes_addresses_are_invalid(
	) {
		let errors = GlobalSettingsBuilder::new()
			.with_raw_bootnodes_addresses(vec!["/ip4//tcp/45421", "//10.42.153.10/tcp/43111"])
			.build()
			.unwrap_err();

		assert_eq!(errors.len(), 2);
		assert_eq!(
            errors.first().unwrap().to_string(),
            "global_settings.bootnodes_addresses[0]: '/ip4//tcp/45421' failed to parse: invalid IPv4 address syntax"
        );
		assert_eq!(
            errors.get(1).unwrap().to_string(),
            "global_settings.bootnodes_addresses[1]: '//10.42.153.10/tcp/43111' unknown protocol string: "
        );
	}

	#[test]
	fn global_settings_builder_should_fails_and_returns_an_error_if_local_ip_is_invalid() {
		let errors = GlobalSettingsBuilder::new().with_local_ip("invalid").build().unwrap_err();

		assert_eq!(errors.len(), 1);
		assert_eq!(
			errors.first().unwrap().to_string(),
			"global_settings.local_ip: invalid IP address syntax"
		);
	}

	#[test]
	fn global_settings_builder_should_fails_and_returns_multiple_errors_if_multiple_fields_are_invalid(
	) {
		let errors = GlobalSettingsBuilder::new()
			.with_raw_bootnodes_addresses(vec!["/ip4//tcp/45421", "//10.42.153.10/tcp/43111"])
			.with_local_ip("invalid")
			.build()
			.unwrap_err();

		assert_eq!(errors.len(), 3);
		assert_eq!(
            errors.first().unwrap().to_string(),
            "global_settings.bootnodes_addresses[0]: '/ip4//tcp/45421' failed to parse: invalid IPv4 address syntax"
        );
		assert_eq!(
            errors.get(1).unwrap().to_string(),
            "global_settings.bootnodes_addresses[1]: '//10.42.153.10/tcp/43111' unknown protocol string: "
        );
		assert_eq!(
			errors.get(2).unwrap().to_string(),
			"global_settings.local_ip: invalid IP address syntax"
		);
	}
}