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/*
 * Copyright 2020 Nuclei Studio OÜ
 *
 * 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 codec::{Decode, Encode};
use sp_runtime::{traits::Saturating, RuntimeDebug};

/// All balance information for an account and an associated currency.
#[derive(Encode, Decode, Clone, PartialEq, Eq, Default, RuntimeDebug)]
pub struct AccountCurrencyData<Balance> {
    /// Non-reserved part of the balance. There may still be restrictions on this, but it is the
    /// total pool what may in principle be transferred, reserved and used for tipping.
    ///
    /// This is the only balance that matters in terms of most operations on tokens. It
    /// alone is used to determine the balance when in the contract execution environment.
    pub free: Balance,
    /// Balance which is reserved and may not be used at all.
    ///
    /// This can still get slashed, but gets slashed last of all.
    ///
    /// This balance is a 'reserve' balance that other subsystems use in order to set aside tokens
    /// that are still 'owned' by the account holder, but which are suspendable.
    pub reserved: Balance,
    /// Balance under which the free balance may never drop below.
    pub frozen: Balance,
}
impl<Balance: Saturating + Copy> AccountCurrencyData<Balance> {
    /// Computes and return the total balance, including reserved funds.
    pub fn total(&self) -> Balance {
        self.free.saturating_add(self.reserved)
    }
}