// Copyright 2019-2020 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.

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

//! Types used to connect to the Millau-Substrate chain.

use relay_substrate_client::{Chain, ChainBase};

use headers_relay::sync_types::SourceHeader;
use sp_runtime::traits::Header as HeaderT;

/// Millau header id.
pub type HeaderId = relay_utils::HeaderId<millau_runtime::Hash, millau_runtime::BlockNumber>;

/// Millau chain definition.
#[derive(Debug, Clone, Copy)]
pub struct Millau;

impl ChainBase for Millau {
	type BlockNumber = millau_runtime::BlockNumber;
	type Hash = millau_runtime::Hash;
	type Hasher = millau_runtime::Hashing;
	type Header = millau_runtime::Header;
}

impl Chain for Millau {
	type AccountId = millau_runtime::AccountId;
	type Index = millau_runtime::Index;
	type SignedBlock = millau_runtime::SignedBlock;
	type Call = millau_runtime::Call;
}

/// Millau header type used in headers sync.
#[derive(Clone, Debug, PartialEq)]
pub struct SyncHeader(millau_runtime::Header);

impl std::ops::Deref for SyncHeader {
	type Target = millau_runtime::Header;

	fn deref(&self) -> &Self::Target {
		&self.0
	}
}

impl From<millau_runtime::Header> for SyncHeader {
	fn from(header: millau_runtime::Header) -> Self {
		Self(header)
	}
}

impl From<SyncHeader> for millau_runtime::Header {
	fn from(header: SyncHeader) -> Self {
		header.0
	}
}

impl SourceHeader<millau_runtime::Hash, millau_runtime::BlockNumber> for SyncHeader {
	fn id(&self) -> HeaderId {
		relay_utils::HeaderId(*self.number(), self.hash())
	}

	fn parent_id(&self) -> HeaderId {
		relay_utils::HeaderId(*self.number() - 1, *self.parent_hash())
	}
}