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// This file is part of Gear.

// Copyright (C) 2021-2024 Gear Technologies Inc.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program 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.

// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.

//! Low-level types used throughout the Substrate code.

#![warn(missing_docs)]
#![cfg_attr(not(feature = "std"), no_std)]

use sp_runtime::{
    generic,
    traits::{BlakeTwo256, IdentifyAccount, Verify},
    MultiSignature, OpaqueExtrinsic,
};

/// An index to a block.
pub type BlockNumber = u32;

/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
pub type Signature = MultiSignature;

/// Alias to the public key used for this chain.
pub type AccountPublic = <Signature as Verify>::Signer;

/// Some way of identifying an account on the chain. We intentionally make it equivalent
/// to the public key of our transaction signing scheme.
pub type AccountId = <AccountPublic as IdentifyAccount>::AccountId;

/// The type for looking up accounts. We don't expect more than 4 billion of them.
pub type AccountIndex = u32;

/// Balance of an account.
pub type Balance = u128;

/// Type used for expressing timestamp.
pub type Moment = u64;

/// Nonce of a transaction in the chain.
pub type Nonce = u32;

/// A hash of some data used by the chain.
pub type Hash = sp_core::H256;

/// A timestamp: milliseconds since the unix epoch.
/// `u64` is enough to represent a duration of half a billion years, when the
/// time scale is milliseconds.
pub type Timestamp = u64;

/// Digest item type.
pub type DigestItem = generic::DigestItem;
/// Header type.
pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
/// Block type.
pub type Block = generic::Block<Header, OpaqueExtrinsic>;
/// Block ID.
pub type BlockId = generic::BlockId<Block>;

/// SS58 prefix of VARA.
pub const VARA_SS58_PREFIX: u8 = 137;