#[macro_export]
macro_rules! impl_elections_weights {
    ($runtime:ident) => {
        parameter_types! {
            /// A limit for off-chain phragmen unsigned solution submission.
            ///
            /// We want to keep it as high as possible, but can't risk having 
            /// it reject, so we always substract the base block execution weight.
            pub OffchainSolutionWeightLimit: Weight = BlockWeights::get()
                .get(DispatchClass::Normal)
                .max_extrinsic
                .expect("Normal extrinsic have weight limit configured by default; qed")
                .saturating_sub($runtime::weights::BlockExecutionWeight::get());

            /// A limit for off-chain phragmen unsigned solution length.
            ///
            /// We allow up to 90% of the block's size to be consumed by the solution.
            pub OffchainSolutionLengthLimit: u32 = Perbill::from_rational(90u32, 100u32) *
                *BlockLength::get()
                .max
                .get(DispatchClass::Normal);
        }
    };
}

/// The number configured here could always be more than the maximum limits of 
/// staking pallet to ensure election snapshot will not run out of memory. For 
/// now, we set them to smaller values since the staking is bounded and the weight
/// pipeline takes for this single pallet.
pub struct BenchmarkConfig;
impl pallet_election_provider_multi_phase::BenchmarkingConfig for BenchmarkConfig {
    const VOTERS: [u32; 2] = [1000, 2000];
    const TARGETS: [u32; 2] = [500, 1000];
    const ACTIVE_VOTERS: [u32; 2] = [500, 800];
    const DESIRED_TARGETS: [u32; 2] = [200, 400];
    const SNAPSHOT_MAXIMUM_VOTERS: u32 = 1000;
    const MINER_MAXIMUM_VOTERS: u32 = 1000;
    const MAXIMUM_TARGETS: u32 = 300;
}

/// The accuracy type used for genesis election provider.
pub type OnChainAccuracy = sp_runtime::Perbill;