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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.

//! Election provider support pallet benchmarking.
//! This is separated into its own crate to avoid bloating the size of the runtime.

#![cfg(feature = "runtime-benchmarks")]
#![cfg_attr(not(feature = "std"), no_std)]

use codec::Decode;
use frame_benchmarking::v1::benchmarks;
use frame_election_provider_support::{NposSolver, PhragMMS, SequentialPhragmen};
use sp_std::vec::Vec;

pub struct Pallet<T: Config>(frame_system::Pallet<T>);
pub trait Config: frame_system::Config {}

const VOTERS: [u32; 2] = [1_000, 2_000];
const TARGETS: [u32; 2] = [500, 1_000];
const VOTES_PER_VOTER: [u32; 2] = [5, 16];

const SEED: u32 = 999;
fn set_up_voters_targets<AccountId: Decode + Clone>(
	voters_len: u32,
	targets_len: u32,
	degree: usize,
) -> (Vec<(AccountId, u64, impl IntoIterator<Item = AccountId>)>, Vec<AccountId>) {
	// fill targets.
	let mut targets = (0..targets_len)
		.map(|i| frame_benchmarking::account::<AccountId>("Target", i, SEED))
		.collect::<Vec<_>>();
	assert!(targets.len() > degree, "we should always have enough voters to fill");
	targets.truncate(degree);

	// fill voters.
	let voters = (0..voters_len)
		.map(|i| {
			let voter = frame_benchmarking::account::<AccountId>("Voter", i, SEED);
			(voter, 1_000, targets.clone())
		})
		.collect::<Vec<_>>();

	(voters, targets)
}

benchmarks! {
	phragmen {
		// number of votes in snapshot.
		let v in (VOTERS[0]) .. VOTERS[1];
		// number of targets in snapshot.
		let t in (TARGETS[0]) .. TARGETS[1];
		// number of votes per voter (ie the degree).
		let d in (VOTES_PER_VOTER[0]) .. VOTES_PER_VOTER[1];

		let (voters, targets) = set_up_voters_targets::<T::AccountId>(v, t, d as usize);
	}: {
		assert!(
			SequentialPhragmen::<T::AccountId, sp_runtime::Perbill>
				::solve(d as usize, targets, voters).is_ok()
		);
	}

	phragmms {
		// number of votes in snapshot.
		let v in (VOTERS[0]) .. VOTERS[1];
		// number of targets in snapshot.
		let t in (TARGETS[0]) .. TARGETS[1];
		// number of votes per voter (ie the degree).
		let d in (VOTES_PER_VOTER[0]) .. VOTES_PER_VOTER[1];

		let (voters, targets) = set_up_voters_targets::<T::AccountId>(v, t, d as usize);
	}: {
		assert!(
			PhragMMS::<T::AccountId, sp_runtime::Perbill>
				::solve(d as usize, targets, voters).is_ok()
		);
	}
}