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// 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.

//! Benchmarking for the `cumulus-pallet-dmp-queue`.

#![cfg(feature = "runtime-benchmarks")]

use crate::*;

use alloc::vec;
use frame_benchmarking::v2::*;
use frame_support::{pallet_prelude::*, traits::Hooks};

#[benchmarks]
mod benchmarks {
	use super::*;

	/// This benchmark uses the proper maximal message length.
	#[benchmark]
	fn on_idle_good_msg() {
		let msg = vec![123; MaxDmpMessageLenOf::<T>::get() as usize];

		Pages::<T>::insert(0, vec![(123, msg.clone())]);
		PageIndex::<T>::put(PageIndexData { begin_used: 0, end_used: 1, overweight_count: 0 });
		MigrationStatus::<T>::set(MigrationState::StartedExport { next_begin_used: 0 });

		#[block]
		{
			Pallet::<T>::on_idle(0u32.into(), Weight::MAX);
		}

		assert_last_event::<T>(Event::Exported { page: 0 }.into());
	}

	/// This benchmark uses 64 KiB messages to emulate a large old message.
	#[benchmark]
	fn on_idle_large_msg() {
		let msg = vec![123; 1 << 16];

		Pages::<T>::insert(0, vec![(123, msg.clone())]);
		PageIndex::<T>::put(PageIndexData { begin_used: 0, end_used: 1, overweight_count: 0 });
		MigrationStatus::<T>::set(MigrationState::StartedExport { next_begin_used: 0 });

		#[block]
		{
			Pallet::<T>::on_idle(0u32.into(), Weight::MAX);
		}

		assert_last_event::<T>(Event::Exported { page: 0 }.into());
	}

	#[benchmark]
	fn on_idle_overweight_good_msg() {
		let msg = vec![123; MaxDmpMessageLenOf::<T>::get() as usize];

		Overweight::<T>::insert(0, (123, msg.clone()));
		PageIndex::<T>::put(PageIndexData { begin_used: 0, end_used: 1, overweight_count: 1 });
		MigrationStatus::<T>::set(MigrationState::StartedOverweightExport {
			next_overweight_index: 0,
		});

		#[block]
		{
			Pallet::<T>::on_idle(0u32.into(), Weight::MAX);
		}

		assert_last_event::<T>(Event::ExportedOverweight { index: 0 }.into());
	}

	#[benchmark]
	fn on_idle_overweight_large_msg() {
		let msg = vec![123; 1 << 16];

		Overweight::<T>::insert(0, (123, msg.clone()));
		PageIndex::<T>::put(PageIndexData { begin_used: 0, end_used: 1, overweight_count: 1 });
		MigrationStatus::<T>::set(MigrationState::StartedOverweightExport {
			next_overweight_index: 0,
		});

		#[block]
		{
			Pallet::<T>::on_idle(0u32.into(), Weight::MAX);
		}

		assert_last_event::<T>(Event::ExportOverweightFailed { index: 0 }.into());
	}

	impl_benchmark_test_suite!(Pallet, crate::mock::new_test_ext(), crate::mock::Runtime);
}

fn assert_last_event<T: Config>(generic_event: <T as Config>::RuntimeEvent) {
	let events = frame_system::Pallet::<T>::events();
	let system_event: <T as frame_system::Config>::RuntimeEvent = generic_event.into();
	let frame_system::EventRecord { event, .. } = events.last().expect("Event expected");
	assert_eq!(event, &system_event.into());
}