// Copyright 2015-2017 Parity Technologies (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/>.

//! Ethereum protocol module.
//!
//! Contains all Ethereum network specific stuff, such as denominations and
//! consensus specifications.

/// Export the ethash module.
pub mod ethash;
/// Export the denominations module.
pub mod denominations;

pub use self::ethash::{Ethash};
pub use self::denominations::*;

use std::path::Path;
use super::spec::*;

/// Most recent fork block that we support on Mainnet.
pub const FORK_SUPPORTED_FOUNDATION: u64 = 2675000;

/// Most recent fork block that we support on Ropsten.
pub const FORK_SUPPORTED_ROPSTEN: u64 = 10;

/// Most recent fork block that we support on Kovan.
pub const FORK_SUPPORTED_KOVAN: u64 = 0;

fn load<'a, T: 'a + Into<Option<&'a Path>>>(cache_dir: T, b: &[u8]) -> Spec {
	match cache_dir.into() {
		Some(path) => Spec::load(path, b),
		None => Spec::load(&::std::env::temp_dir(), b)
	}.expect("chain spec is invalid")
}

/// Create a new Foundation Olympic chain spec.
pub fn new_olympic(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/olympic.json")) }

/// Create a new Foundation Mainnet chain spec.
pub fn new_foundation(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/foundation.json")) }

/// Create a new Classic Mainnet chain spec without the DAO hardfork.
pub fn new_classic(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/classic.json")) }

/// Create a new Expanse mainnet chain spec.
pub fn new_expanse(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/expanse.json")) }

/// Create a new Kovan testnet chain spec.
pub fn new_kovan(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/kovan.json")) }

/// Create a new Foundation Ropsten chain spec.
pub fn new_ropsten(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/ropsten.json")) }

/// Create a new Morden chain spec.
pub fn new_morden(cache_dir: &Path) -> Spec { load(cache_dir, include_bytes!("../../res/ethereum/morden.json")) }

// For tests

/// Create a new Foundation Frontier-era chain spec as though it never changes to Homestead.
pub fn new_frontier_test() -> Spec { load(None, include_bytes!("../../res/ethereum/frontier_test.json")) }

/// Create a new Foundation Homestead-era chain spec as though it never changed from Frontier.
pub fn new_homestead_test() -> Spec { load(None, include_bytes!("../../res/ethereum/homestead_test.json")) }

/// Create a new Foundation Homestead-EIP150-era chain spec as though it never changed from Homestead/Frontier.
pub fn new_eip150_test() -> Spec { load(None, include_bytes!("../../res/ethereum/eip150_test.json")) }

/// Create a new Foundation Homestead-EIP161-era chain spec as though it never changed from Homestead/Frontier.
pub fn new_eip161_test() -> Spec { load(None, include_bytes!("../../res/ethereum/eip161_test.json")) }

/// Create a new Foundation Frontier/Homestead/DAO chain spec with transition points at #5 and #8.
pub fn new_transition_test() -> Spec { load(None, include_bytes!("../../res/ethereum/transition_test.json")) }

/// Create a new Foundation Mainnet chain spec without genesis accounts.
pub fn new_mainnet_like() -> Spec { load(None, include_bytes!("../../res/ethereum/frontier_like_test.json")) }

/// Create a new Foundation Metropolis era spec.
pub fn new_metropolis_test() -> Spec { load(None, include_bytes!("../../res/ethereum/metropolis_test.json")) }

#[cfg(test)]
mod tests {
	use util::*;
	use state::*;
	use super::*;
	use tests::helpers::*;
	use views::BlockView;

	#[test]
	fn ensure_db_good() {
		let spec = new_morden(&::std::env::temp_dir());
		let engine = &spec.engine;
		let genesis_header = spec.genesis_header();
		let db = spec.ensure_db_good(get_temp_state_db(), &Default::default()).unwrap();
		let s = State::from_existing(db, genesis_header.state_root().clone(), engine.account_start_nonce(0), Default::default()).unwrap();
		assert_eq!(s.balance(&"0000000000000000000000000000000000000001".into()).unwrap(), 1u64.into());
		assert_eq!(s.balance(&"0000000000000000000000000000000000000002".into()).unwrap(), 1u64.into());
		assert_eq!(s.balance(&"0000000000000000000000000000000000000003".into()).unwrap(), 1u64.into());
		assert_eq!(s.balance(&"0000000000000000000000000000000000000004".into()).unwrap(), 1u64.into());
		assert_eq!(s.balance(&"102e61f5d8f9bc71d0ad4a084df4e65e05ce0e1c".into()).unwrap(), U256::from(1u64) << 200);
		assert_eq!(s.balance(&"0000000000000000000000000000000000000000".into()).unwrap(), 0u64.into());
	}

	#[test]
	fn morden() {
		let morden = new_morden(&::std::env::temp_dir());

		assert_eq!(morden.state_root(), "f3f4696bbf3b3b07775128eb7a3763279a394e382130f27c21e70233e04946a9".into());
		let genesis = morden.genesis_block();
		assert_eq!(BlockView::new(&genesis).header_view().hash(), "0cd786a2425d16f152c658316c423e6ce1181e15c3295826d7c9904cba9ce303".into());

		let _ = morden.engine;
	}

	#[test]
	fn frontier() {
		let frontier = new_foundation(&::std::env::temp_dir());

		assert_eq!(frontier.state_root(), "d7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544".into());
		let genesis = frontier.genesis_block();
		assert_eq!(BlockView::new(&genesis).header_view().hash(), "d4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3".into());

		let _ = frontier.engine;
	}
}