// Copyright 2019 Parity Technologies (UK) Ltd.
// This file is part of Cumulus.

// Cumulus 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.

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

use parachain_runtime::{
	AccountId, BalancesConfig, GenesisConfig, IndicesConfig, SudoConfig, SystemConfig, WASM_BINARY,
};
use sc_service;
use sp_core::{Pair, Public};

/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
pub type ChainSpec = sc_service::GenericChainSpec<GenesisConfig>;

/// Helper function to generate a crypto pair from seed
pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
	TPublic::Pair::from_string(&format!("//{}", seed), None)
		.expect("static values are valid; qed")
		.public()
}

/// Helper function to generate stash, controller and session key from seed
pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId) {
	(
		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
		get_from_seed::<AccountId>(seed),
	)
}

/// Returns the chain spec.
pub fn get_chain_spec() -> ChainSpec {
	ChainSpec::from_genesis(
		"Local Testnet",
		"parachain_local_testnet",
		sc_service::ChainType::Local,
		|| {
			testnet_genesis(
				vec![
					get_authority_keys_from_seed("Alice"),
					get_authority_keys_from_seed("Bob"),
				],
				get_from_seed::<AccountId>("Alice"),
				vec![
					get_from_seed::<AccountId>("Alice"),
					get_from_seed::<AccountId>("Bob"),
					get_from_seed::<AccountId>("Charlie"),
					get_from_seed::<AccountId>("Dave"),
					get_from_seed::<AccountId>("Eve"),
					get_from_seed::<AccountId>("Ferdie"),
					get_from_seed::<AccountId>("Alice//stash"),
					get_from_seed::<AccountId>("Bob//stash"),
					get_from_seed::<AccountId>("Charlie//stash"),
					get_from_seed::<AccountId>("Dave//stash"),
					get_from_seed::<AccountId>("Eve//stash"),
					get_from_seed::<AccountId>("Ferdie//stash"),
				],
				true,
			)
		},
		vec![],
		None,
		None,
		None,
		None,
	)
}

fn testnet_genesis(
	_initial_authorities: Vec<(AccountId, AccountId)>,
	root_key: AccountId,
	endowed_accounts: Vec<AccountId>,
	_enable_println: bool,
) -> GenesisConfig {
	GenesisConfig {
		frame_system: Some(SystemConfig {
			code: WASM_BINARY.to_vec(),
			changes_trie_config: Default::default(),
		}),
		pallet_indices: Some(IndicesConfig {
			indices: vec![],
		}),
		pallet_balances: Some(BalancesConfig {
			balances: endowed_accounts
				.iter()
				.cloned()
				.map(|k| (k, 1 << 60))
				.collect(),
		}),
		pallet_sudo: Some(SudoConfig { key: root_key }),
	}
}