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// Copyright (C) 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/>.

//! Benchmarking for assigned_slots pallet

#![cfg(feature = "runtime-benchmarks")]
use super::*;

use frame_benchmarking::v2::*;
use frame_support::assert_ok;
use frame_system::{pallet_prelude::BlockNumberFor, RawOrigin};
use polkadot_primitives::Id as ParaId;
use sp_runtime::traits::Bounded;

type CurrencyOf<T> = <<T as Config>::Leaser as Leaser<BlockNumberFor<T>>>::Currency;
type BalanceOf<T> = <<<T as Config>::Leaser as Leaser<BlockNumberFor<T>>>::Currency as Currency<
	<T as frame_system::Config>::AccountId,
>>::Balance;
#[benchmarks(where T: Config)]
mod benchmarks {
	use super::*;

	use crate::assigned_slots::Pallet as AssignedSlots;

	fn register_parachain<T: Config>(para_id: ParaId) {
		let who: T::AccountId = whitelisted_caller();
		let worst_validation_code = T::Registrar::worst_validation_code();
		let worst_head_data = T::Registrar::worst_head_data();

		CurrencyOf::<T>::make_free_balance_be(&who, BalanceOf::<T>::max_value());

		assert_ok!(T::Registrar::register(
			who,
			para_id,
			worst_head_data,
			worst_validation_code.clone()
		));
		assert_ok!(paras::Pallet::<T>::add_trusted_validation_code(
			frame_system::Origin::<T>::Root.into(),
			worst_validation_code,
		));
		T::Registrar::execute_pending_transitions();
	}

	#[benchmark]
	fn assign_perm_parachain_slot() {
		let para_id = ParaId::from(1_u32);
		let caller = RawOrigin::Root;

		let _ =
			AssignedSlots::<T>::set_max_permanent_slots(frame_system::Origin::<T>::Root.into(), 10);
		register_parachain::<T>(para_id);

		let counter = PermanentSlotCount::<T>::get();
		let current_lease_period: BlockNumberFor<T> =
			T::Leaser::lease_period_index(frame_system::Pallet::<T>::block_number())
				.and_then(|x| Some(x.0))
				.unwrap();
		#[extrinsic_call]
		assign_perm_parachain_slot(caller, para_id);

		assert_eq!(
			PermanentSlots::<T>::get(para_id),
			Some((
				current_lease_period,
				LeasePeriodOf::<T>::from(T::PermanentSlotLeasePeriodLength::get()),
			))
		);
		assert_eq!(PermanentSlotCount::<T>::get(), counter + 1);
	}

	#[benchmark]
	fn assign_temp_parachain_slot() {
		let para_id = ParaId::from(2_u32);
		let caller = RawOrigin::Root;

		let _ =
			AssignedSlots::<T>::set_max_temporary_slots(frame_system::Origin::<T>::Root.into(), 10);
		register_parachain::<T>(para_id);

		let current_lease_period: BlockNumberFor<T> =
			T::Leaser::lease_period_index(frame_system::Pallet::<T>::block_number())
				.and_then(|x| Some(x.0))
				.unwrap();

		let counter = TemporarySlotCount::<T>::get();
		#[extrinsic_call]
		assign_temp_parachain_slot(caller, para_id, SlotLeasePeriodStart::Current);

		let tmp = ParachainTemporarySlot {
			manager: whitelisted_caller(),
			period_begin: current_lease_period,
			period_count: LeasePeriodOf::<T>::from(T::TemporarySlotLeasePeriodLength::get()),
			last_lease: Some(BlockNumberFor::<T>::zero()),
			lease_count: 1,
		};
		assert_eq!(TemporarySlots::<T>::get(para_id), Some(tmp));
		assert_eq!(TemporarySlotCount::<T>::get(), counter + 1);
	}

	#[benchmark]
	fn unassign_parachain_slot() {
		let para_id = ParaId::from(3_u32);
		let caller = RawOrigin::Root;

		let _ =
			AssignedSlots::<T>::set_max_temporary_slots(frame_system::Origin::<T>::Root.into(), 10);
		register_parachain::<T>(para_id);

		let _ = AssignedSlots::<T>::assign_temp_parachain_slot(
			caller.clone().into(),
			para_id,
			SlotLeasePeriodStart::Current,
		);

		let counter = TemporarySlotCount::<T>::get();
		#[extrinsic_call]
		unassign_parachain_slot(caller, para_id);

		assert_eq!(TemporarySlots::<T>::get(para_id), None);
		assert_eq!(TemporarySlotCount::<T>::get(), counter - 1);
	}

	#[benchmark]
	fn set_max_permanent_slots() {
		let caller = RawOrigin::Root;
		#[extrinsic_call]
		set_max_permanent_slots(caller, u32::MAX);

		assert_eq!(MaxPermanentSlots::<T>::get(), u32::MAX);
	}

	#[benchmark]
	fn set_max_temporary_slots() {
		let caller = RawOrigin::Root;
		#[extrinsic_call]
		set_max_temporary_slots(caller, u32::MAX);

		assert_eq!(MaxTemporarySlots::<T>::get(), u32::MAX);
	}

	impl_benchmark_test_suite!(
		AssignedSlots,
		crate::assigned_slots::tests::new_test_ext(),
		crate::assigned_slots::tests::Test,
	);
}