// Copyright 2017 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot 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.

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

//! The Polkadot runtime. This can be compiled with ``#[no_std]`, ready for Wasm.

#![cfg_attr(not(feature = "std"), no_std)]
// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
#![recursion_limit="256"]

mod curated_grandpa;
mod parachains;
mod claims;
mod slot_range;
mod slots;

use rstd::prelude::*;
use substrate_primitives::u32_trait::{_2, _4};
use primitives::{
	AccountId, AccountIndex, Balance, BlockNumber, Hash, Nonce, SessionKey, Signature,
	parachain, SessionSignature,
};
use client::{
	block_builder::api::{self as block_builder_api, InherentData, CheckInherentsResult},
	runtime_api as client_api, impl_runtime_apis,
};
use sr_primitives::{
	ApplyResult, generic, transaction_validity::TransactionValidity, create_runtime_str,
	traits::{
		BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Convert, AuthorityIdFor
	}
};
use version::RuntimeVersion;
use grandpa::fg_primitives::{self, ScheduledChange};
use council::{motions as council_motions, voting as council_voting};
#[cfg(feature = "std")]
use council::seats as council_seats;
#[cfg(any(feature = "std", test))]
use version::NativeVersion;
use substrate_primitives::OpaqueMetadata;
use srml_support::{parameter_types, construct_runtime};

#[cfg(feature = "std")]
pub use staking::StakerStatus;
#[cfg(any(feature = "std", test))]
pub use sr_primitives::BuildStorage;
pub use consensus::Call as ConsensusCall;
pub use timestamp::Call as TimestampCall;
pub use balances::Call as BalancesCall;
pub use parachains::{Call as ParachainsCall, INHERENT_IDENTIFIER as PARACHAIN_INHERENT_IDENTIFIER};
pub use sr_primitives::{Permill, Perbill};
pub use timestamp::BlockPeriod;
pub use srml_support::StorageValue;

/// Runtime version.
pub const VERSION: RuntimeVersion = RuntimeVersion {
	spec_name: create_runtime_str!("polkadot"),
	impl_name: create_runtime_str!("parity-polkadot"),
	authoring_version: 1,
	spec_version: 1000,
	impl_version: 0,
	apis: RUNTIME_API_VERSIONS,
};

/// Native version.
#[cfg(any(feature = "std", test))]
pub fn native_version() -> NativeVersion {
	NativeVersion {
		runtime_version: VERSION,
		can_author_with: Default::default(),
	}
}

impl system::Trait for Runtime {
	type Origin = Origin;
	type Index = Nonce;
	type BlockNumber = BlockNumber;
	type Hash = Hash;
	type Hashing = BlakeTwo256;
	type Digest = generic::Digest<Log>;
	type AccountId = AccountId;
	type Lookup = Indices;
	type Header = generic::Header<BlockNumber, BlakeTwo256, Log>;
	type Event = Event;
	type Log = Log;
}

impl aura::Trait for Runtime {
	type HandleReport = aura::StakingSlasher<Runtime>;
}

impl indices::Trait for Runtime {
	type IsDeadAccount = Balances;
	type AccountIndex = AccountIndex;
	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
	type Event = Event;
}

impl balances::Trait for Runtime {
	type Balance = Balance;
	type OnFreeBalanceZero = Staking;
	type OnNewAccount = Indices;
	type Event = Event;
	type TransactionPayment = ();
	type DustRemoval = ();
	type TransferPayment = ();
}

impl consensus::Trait for Runtime {
	type Log = Log;
	type SessionKey = SessionKey;

	// the aura module handles offline-reports internally
	// rather than using an explicit report system.
	type InherentOfflineReport = ();
}

impl timestamp::Trait for Runtime {
	type Moment = u64;
	type OnTimestampSet = Aura;
}

impl session::Trait for Runtime {
	type ConvertAccountIdToSessionKey = ();
	type OnSessionChange = Staking;
	type Event = Event;
}

/// Converter for currencies to votes.
pub struct CurrencyToVoteHandler;

impl CurrencyToVoteHandler {
	fn factor() -> u128 { (Balances::total_issuance() / u64::max_value() as u128).max(1) }
}

impl Convert<u128, u64> for CurrencyToVoteHandler {
	fn convert(x: u128) -> u64 { (x / Self::factor()) as u64 }
}

impl Convert<u128, u128> for CurrencyToVoteHandler {
	fn convert(x: u128) -> u128 { x * Self::factor() }
}


impl staking::Trait for Runtime {
	type OnRewardMinted = Treasury;
	type CurrencyToVote = CurrencyToVoteHandler;
	type Event = Event;
	type Currency = balances::Module<Self>;
	type Slash = ();
	type Reward = ();
}

impl democracy::Trait for Runtime {
	type Currency = balances::Module<Self>;
	type Proposal = Call;
	type Event = Event;
}

impl council::Trait for Runtime {
	type Event = Event;
	type BadPresentation = ();
	type BadReaper = ();
}

impl council::voting::Trait for Runtime {
	type Event = Event;
}

impl council::motions::Trait for Runtime {
	type Origin = Origin;
	type Proposal = Call;
	type Event = Event;
}

impl treasury::Trait for Runtime {
	type Currency = balances::Module<Self>;
	type ApproveOrigin = council_motions::EnsureMembers<_4>;
	type RejectOrigin = council_motions::EnsureMembers<_2>;
	type Event = Event;
	type MintedForSpending = ();
	type ProposalRejection = ();
}

impl grandpa::Trait for Runtime {
	type SessionKey = SessionKey;
	type Log = Log;
	type Event = Event;
}

impl parachains::Trait for Runtime {}

parameter_types!{
	pub const LeasePeriod: BlockNumber = 100000;
	pub const EndingPeriod: BlockNumber = 1000;
}

impl slots::Trait for Runtime {
	type Event = Event;
	type Currency = balances::Module<Self>;
	type Parachains = parachains::Module<Self>;
	type LeasePeriod = LeasePeriod;
	type EndingPeriod = EndingPeriod;
}

impl curated_grandpa::Trait for Runtime { }

impl sudo::Trait for Runtime {
	type Event = Event;
	type Proposal = Call;
}

construct_runtime!(
	pub enum Runtime with Log(InternalLog: DigestItem<Hash, SessionKey, SessionSignature>) where
		Block = Block,
		NodeBlock = primitives::Block,
		UncheckedExtrinsic = UncheckedExtrinsic
	{
		System: system::{default, Log(ChangesTrieRoot)},
		Aura: aura::{Module},
		Timestamp: timestamp::{Module, Call, Storage, Config<T>, Inherent},
		// consensus' Inherent is not provided because it assumes instant-finality blocks.
		Consensus: consensus::{Module, Call, Storage, Config<T>, Log(AuthoritiesChange) },
		Indices: indices,
		Balances: balances,
		Session: session,
		Staking: staking,
		Democracy: democracy,
		Grandpa: grandpa::{Module, Call, Storage, Config<T>, Log(), Event<T>},
		CuratedGrandpa: curated_grandpa::{Module, Call, Config<T>, Storage},
		Council: council::{Module, Call, Storage, Event<T>},
		CouncilVoting: council_voting,
		CouncilMotions: council_motions::{Module, Call, Storage, Event<T>, Origin},
		CouncilSeats: council_seats::{Config<T>},
		Treasury: treasury,
		Parachains: parachains::{Module, Call, Storage, Config<T>, Inherent},
		Slots: slots::{Module, Call, Storage, Event<T>},
		Sudo: sudo,
	}
);

/// The address format for describing accounts.
pub type Address = <Indices as StaticLookup>::Source;
/// Block header type as expected by this runtime.
pub type Header = generic::Header<BlockNumber, BlakeTwo256, Log>;
/// Block type as expected by this runtime.
pub type Block = generic::Block<Header, UncheckedExtrinsic>;
/// A Block signed with a Justification
pub type SignedBlock = generic::SignedBlock<Block>;
/// BlockId type as expected by this runtime.
pub type BlockId = generic::BlockId<Block>;
/// Unchecked extrinsic type as expected by this runtime.
pub type UncheckedExtrinsic = generic::UncheckedMortalCompactExtrinsic<Address, Nonce, Call, Signature>;
/// Extrinsic type that has already been checked.
pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Nonce, Call>;
/// Executive: handles dispatch to the various modules.
pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Balances, Runtime, AllModules>;

impl_runtime_apis! {
	impl client_api::Core<Block> for Runtime {
		fn version() -> RuntimeVersion {
			VERSION
		}

		fn authorities() -> Vec<SessionKey> {
			Consensus::authorities()
		}

		fn execute_block(block: Block) {
			Executive::execute_block(block)
		}

		fn initialize_block(header: &<Block as BlockT>::Header) {
			Executive::initialize_block(header)
		}
	}

	impl client_api::Metadata<Block> for Runtime {
		fn metadata() -> OpaqueMetadata {
			Runtime::metadata().into()
		}
	}

	impl block_builder_api::BlockBuilder<Block> for Runtime {
		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
			Executive::apply_extrinsic(extrinsic)
		}

		fn finalize_block() -> <Block as BlockT>::Header {
			Executive::finalize_block()
		}

		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
			data.create_extrinsics()
		}

		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
			data.check_extrinsics(&block)
		}

		fn random_seed() -> <Block as BlockT>::Hash {
			System::random_seed()
		}
	}

	impl client_api::TaggedTransactionQueue<Block> for Runtime {
		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
			Executive::validate_transaction(tx)
		}
	}

	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
		fn offchain_worker(number: sr_primitives::traits::NumberFor<Block>) {
			Executive::offchain_worker(number)
		}
	}

	impl parachain::ParachainHost<Block> for Runtime {
		fn validators() -> Vec<parachain::ValidatorId> {
			Consensus::authorities()  // only possible as long as parachain validator crypto === aura crypto
		}
		fn duty_roster() -> parachain::DutyRoster {
			Parachains::calculate_duty_roster()
		}
		fn active_parachains() -> Vec<parachain::Id> {
			Parachains::active_parachains()
		}
		fn parachain_head(id: parachain::Id) -> Option<Vec<u8>> {
			Parachains::parachain_head(&id)
		}
		fn parachain_code(id: parachain::Id) -> Option<Vec<u8>> {
			Parachains::parachain_code(&id)
		}
		fn ingress(to: parachain::Id) -> Option<parachain::ConsolidatedIngressRoots> {
			Parachains::ingress(to).map(Into::into)
		}
	}

	impl fg_primitives::GrandpaApi<Block> for Runtime {
		fn grandpa_pending_change(digest: &DigestFor<Block>)
			-> Option<ScheduledChange<BlockNumber>>
		{
			for log in digest.logs.iter().filter_map(|l| match l {
				Log(InternalLog::grandpa(grandpa_signal)) => Some(grandpa_signal),
				_=> None
			}) {
				if let Some(change) = Grandpa::scrape_digest_change(log) {
					return Some(change);
				}
			}
			None
		}

		fn grandpa_forced_change(_digest: &DigestFor<Block>)
			-> Option<(BlockNumber, ScheduledChange<BlockNumber>)>
		{
			None // disable forced changes.
		}

		fn grandpa_authorities() -> Vec<(SessionKey, u64)> {
			Grandpa::grandpa_authorities()
		}
	}

	impl consensus_aura::AuraApi<Block> for Runtime {
		fn slot_duration() -> u64 {
			Aura::slot_duration()
		}
	}

	impl consensus_authorities::AuthoritiesApi<Block> for Runtime {
		fn authorities() -> Vec<AuthorityIdFor<Block>> {
			Consensus::authorities()
		}
	}

}