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// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use bitflags::bitflags;

bitflags! {
	/// Flags used by a contract to customize exit behaviour.
	#[cfg_attr(feature = "scale", derive(codec::Encode, codec::Decode, scale_info::TypeInfo))]
	#[derive(Default)]
	pub struct ReturnFlags: u32 {
		/// If this bit is set all changes made by the contract execution are rolled back.
		const REVERT = 0x0000_0001;
	}
}

bitflags! {
	/// Flags used to change the behaviour of `seal_call` and `seal_delegate_call`.
	pub struct CallFlags: u32 {
		/// Forward the input of current function to the callee.
		///
		/// Supplied input pointers are ignored when set.
		///
		/// # Note
		///
		/// A forwarding call will consume the current contracts input. Any attempt to
		/// access the input after this call returns will lead to [`Error::InputForwarded`].
		/// It does not matter if this is due to calling `call_data_copy` or trying another
		/// forwarding call. Consider using [`Self::CLONE_INPUT`] in order to preserve
		/// the input.
		const FORWARD_INPUT = 0b0000_0001;
		/// Identical to [`Self::FORWARD_INPUT`] but without consuming the input.
		///
		/// This adds some additional weight costs to the call.
		///
		/// # Note
		///
		/// This implies [`Self::FORWARD_INPUT`] and takes precedence when both are set.
		const CLONE_INPUT = 0b0000_0010;
		/// Do not return from the call but rather return the result of the callee to the
		/// callers caller.
		///
		/// # Note
		///
		/// This makes the current contract completely transparent to its caller by replacing
		/// this contracts potential output by the callee ones. Any code after `seal_call`
		/// can be safely considered unreachable.
		const TAIL_CALL = 0b0000_0100;
		/// Allow the callee to reenter into the current contract.
		///
		/// Without this flag any reentrancy into the current contract that originates from
		/// the callee (or any of its callees) is denied. This includes the first callee:
		/// You cannot call into yourself with this flag set.
		///
		/// # Note
		///
		/// For `seal_delegate_call` should be always unset, otherwise
		/// [`Error::InvalidCallFlags`] is returned.
		const ALLOW_REENTRY = 0b0000_1000;
		/// Indicates that the callee is restricted from modifying the state during call execution,
		/// equivalent to Ethereum's STATICCALL.
		///
		/// # Note
		///
		/// For `seal_delegate_call` should be always unset, otherwise
		/// [`Error::InvalidCallFlags`] is returned.
		const READ_ONLY = 0b0001_0000;
	}
}

bitflags! {
	/// Flags used by a contract to customize storage behaviour.
	pub struct StorageFlags: u32 {
		/// Access the transient storage instead of the persistent one.
		const TRANSIENT = 0x0000_0001;
	}
}