// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.

// Parity 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.

// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.

use std::str::FromStr;
pub use std::time::Duration;
pub use blockchain::Config as BlockChainConfig;
pub use trace::Config as TraceConfig;
pub use evm::VMType;

use verification::{VerifierType, QueueConfig};
use util::{journaldb, CompactionProfile};
use util::trie::TrieSpec;

/// Client state db compaction profile
#[derive(Debug, PartialEq)]
pub enum DatabaseCompactionProfile {
	/// Default compaction profile
	Default,
	/// HDD or other slow storage io compaction profile
	HDD,
}

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

impl DatabaseCompactionProfile {
	/// Returns corresponding compaction profile.
	pub fn compaction_profile(&self) -> CompactionProfile {
		match *self {
			DatabaseCompactionProfile::Default => Default::default(),
			DatabaseCompactionProfile::HDD => CompactionProfile::hdd(),
		}
	}
}

impl FromStr for DatabaseCompactionProfile {
	type Err = String;

	fn from_str(s: &str) -> Result<Self, Self::Err> {
		match s {
			"ssd" | "default" => Ok(DatabaseCompactionProfile::Default),
			"hdd" => Ok(DatabaseCompactionProfile::HDD),
			_ => Err("Invalid compaction profile given. Expected hdd/ssd (default).".into()),
		}
	}
}

/// Operating mode for the client.
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Mode {
	/// Always on.
	Active,
	/// Goes offline after RLP is inactive for some (given) time, but
	/// comes back online after a while of inactivity.
	Passive(Duration, Duration),
	/// Goes offline after RLP is inactive for some (given) time and
	/// stays inactive.
	Dark(Duration),
}

impl Default for Mode {
	fn default() -> Self {
		Mode::Active
	}
}

/// Client configuration. Includes configs for all sub-systems.
#[derive(Debug, PartialEq, Default)]
pub struct ClientConfig {
	/// Block queue configuration.
	pub queue: QueueConfig,
	/// Blockchain configuration.
	pub blockchain: BlockChainConfig,
	/// Trace configuration.
	pub tracing: TraceConfig,
	/// VM type.
	pub vm_type: VMType,
	/// Trie type.
	pub trie_spec: TrieSpec,
	/// The JournalDB ("pruning") algorithm to use.
	pub pruning: journaldb::Algorithm,
	/// The name of the client instance.
	pub name: String,
	/// State db cache-size if not default
	pub db_cache_size: Option<usize>,
	/// State db compaction profile
	pub db_compaction: DatabaseCompactionProfile,
	/// Should db have WAL enabled?
	pub db_wal: bool,
	/// Operating mode
	pub mode: Mode,
	/// Type of block verifier used by client.
	pub verifier_type: VerifierType,
}

#[cfg(test)]
mod test {
	use super::{DatabaseCompactionProfile, Mode};

	#[test]
	fn test_default_compaction_profile() {
		assert_eq!(DatabaseCompactionProfile::default(), DatabaseCompactionProfile::Default);
	}

	#[test]
	fn test_parsing_compaction_profile() {
		assert_eq!(DatabaseCompactionProfile::Default, "ssd".parse().unwrap());
		assert_eq!(DatabaseCompactionProfile::Default, "default".parse().unwrap());
		assert_eq!(DatabaseCompactionProfile::HDD, "hdd".parse().unwrap());
	}

	#[test]
	fn test_mode_default() {
		assert_eq!(Mode::default(), Mode::Active);
	}
}