// This file is part of Substrate.

// Copyright (C) 2021-2022 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.

use std::vec;

use frame_election_provider_support::{onchain, SequentialPhragmen};
use frame_support::{
	construct_runtime, parameter_types,
	sp_io::TestExternalities,
	traits::{
		ConstU16, ConstU32, ConstU64, GenesisBuild, KeyOwnerProofSystem, OnFinalize, OnInitialize,
	},
	BasicExternalities,
};
use pallet_session::historical as pallet_session_historical;
use sp_core::{crypto::KeyTypeId, ConstU128, H256};
use sp_runtime::{
	app_crypto::ecdsa::Public,
	curve::PiecewiseLinear,
	impl_opaque_keys,
	testing::{Header, TestXt},
	traits::{BlakeTwo256, IdentityLookup, OpaqueKeys},
	Perbill,
};
use sp_staking::{EraIndex, SessionIndex};

use crate as pallet_beefy;

pub use beefy_primitives::{
	crypto::{AuthorityId as BeefyId, AuthoritySignature as BeefySignature},
	ConsensusLog, EquivocationProof, BEEFY_ENGINE_ID,
};

impl_opaque_keys! {
	pub struct MockSessionKeys {
		pub dummy: pallet_beefy::Pallet<Test>,
	}
}

type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Test>;
type Block = frame_system::mocking::MockBlock<Test>;

construct_runtime!(
	pub enum Test where
		Block = Block,
		NodeBlock = Block,
		UncheckedExtrinsic = UncheckedExtrinsic,
	{
		System: frame_system,
		Authorship: pallet_authorship,
		Timestamp: pallet_timestamp,
		Balances: pallet_balances,
		Beefy: pallet_beefy,
		Staking: pallet_staking,
		Session: pallet_session,
		Offences: pallet_offences,
		Historical: pallet_session_historical,
	}
);

impl frame_system::Config for Test {
	type BaseCallFilter = frame_support::traits::Everything;
	type BlockWeights = ();
	type BlockLength = ();
	type DbWeight = ();
	type RuntimeOrigin = RuntimeOrigin;
	type Index = u64;
	type BlockNumber = u64;
	type Hash = H256;
	type RuntimeCall = RuntimeCall;
	type Hashing = BlakeTwo256;
	type AccountId = u64;
	type Lookup = IdentityLookup<Self::AccountId>;
	type Header = Header;
	type RuntimeEvent = RuntimeEvent;
	type BlockHashCount = ConstU64<250>;
	type Version = ();
	type PalletInfo = PalletInfo;
	type AccountData = pallet_balances::AccountData<u128>;
	type OnNewAccount = ();
	type OnKilledAccount = ();
	type SystemWeightInfo = ();
	type SS58Prefix = ConstU16<42>;
	type OnSetCode = ();
	type MaxConsumers = ConstU32<16>;
}

impl<C> frame_system::offchain::SendTransactionTypes<C> for Test
where
	RuntimeCall: From<C>,
{
	type OverarchingCall = RuntimeCall;
	type Extrinsic = TestXt<RuntimeCall, ()>;
}

parameter_types! {
	pub const Period: u64 = 1;
	pub const ReportLongevity: u64 =
		BondingDuration::get() as u64 * SessionsPerEra::get() as u64 * Period::get();
}

impl pallet_beefy::Config for Test {
	type BeefyId = BeefyId;
	type KeyOwnerProofSystem = Historical;
	type KeyOwnerProof =
		<Self::KeyOwnerProofSystem as KeyOwnerProofSystem<(KeyTypeId, BeefyId)>>::Proof;
	type KeyOwnerIdentification = <Self::KeyOwnerProofSystem as KeyOwnerProofSystem<(
		KeyTypeId,
		BeefyId,
	)>>::IdentificationTuple;
	type HandleEquivocation =
		super::EquivocationHandler<u64, Self::KeyOwnerIdentification, Offences, ReportLongevity>;
	type MaxAuthorities = ConstU32<100>;
	type OnNewValidatorSet = ();
	type WeightInfo = ();
}

parameter_types! {
	pub const DisabledValidatorsThreshold: Perbill = Perbill::from_percent(33);
}

impl pallet_session::Config for Test {
	type RuntimeEvent = RuntimeEvent;
	type ValidatorId = u64;
	type ValidatorIdOf = pallet_staking::StashOf<Self>;
	type ShouldEndSession = pallet_session::PeriodicSessions<ConstU64<1>, ConstU64<0>>;
	type NextSessionRotation = pallet_session::PeriodicSessions<ConstU64<1>, ConstU64<0>>;
	type SessionManager = pallet_session::historical::NoteHistoricalRoot<Self, Staking>;
	type SessionHandler = <MockSessionKeys as OpaqueKeys>::KeyTypeIdProviders;
	type Keys = MockSessionKeys;
	type WeightInfo = ();
}

impl pallet_session::historical::Config for Test {
	type FullIdentification = pallet_staking::Exposure<u64, u128>;
	type FullIdentificationOf = pallet_staking::ExposureOf<Self>;
}

impl pallet_authorship::Config for Test {
	type FindAuthor = ();
	type EventHandler = ();
}

impl pallet_balances::Config for Test {
	type MaxLocks = ();
	type MaxReserves = ();
	type ReserveIdentifier = [u8; 8];
	type Balance = u128;
	type DustRemoval = ();
	type RuntimeEvent = RuntimeEvent;
	type ExistentialDeposit = ConstU128<1>;
	type AccountStore = System;
	type WeightInfo = ();
}

impl pallet_timestamp::Config for Test {
	type Moment = u64;
	type OnTimestampSet = ();
	type MinimumPeriod = ConstU64<3>;
	type WeightInfo = ();
}

pallet_staking_reward_curve::build! {
	const REWARD_CURVE: PiecewiseLinear<'static> = curve!(
		min_inflation: 0_025_000u64,
		max_inflation: 0_100_000,
		ideal_stake: 0_500_000,
		falloff: 0_050_000,
		max_piece_count: 40,
		test_precision: 0_005_000,
	);
}

parameter_types! {
	pub const SessionsPerEra: SessionIndex = 3;
	pub const BondingDuration: EraIndex = 3;
	pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
}

pub struct OnChainSeqPhragmen;
impl onchain::Config for OnChainSeqPhragmen {
	type System = Test;
	type Solver = SequentialPhragmen<u64, Perbill>;
	type DataProvider = Staking;
	type WeightInfo = ();
	type MaxWinners = ConstU32<100>;
	type VotersBound = ConstU32<{ u32::MAX }>;
	type TargetsBound = ConstU32<{ u32::MAX }>;
}

impl pallet_staking::Config for Test {
	type MaxNominations = ConstU32<16>;
	type RewardRemainder = ();
	type CurrencyToVote = frame_support::traits::SaturatingCurrencyToVote;
	type RuntimeEvent = RuntimeEvent;
	type Currency = Balances;
	type CurrencyBalance = <Self as pallet_balances::Config>::Balance;
	type Slash = ();
	type Reward = ();
	type SessionsPerEra = SessionsPerEra;
	type BondingDuration = BondingDuration;
	type SlashDeferDuration = ();
	type AdminOrigin = frame_system::EnsureRoot<Self::AccountId>;
	type SessionInterface = Self;
	type UnixTime = pallet_timestamp::Pallet<Test>;
	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
	type MaxNominatorRewardedPerValidator = ConstU32<64>;
	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
	type NextNewSession = Session;
	type ElectionProvider = onchain::OnChainExecution<OnChainSeqPhragmen>;
	type GenesisElectionProvider = Self::ElectionProvider;
	type VoterList = pallet_staking::UseNominatorsAndValidatorsMap<Self>;
	type TargetList = pallet_staking::UseValidatorsMap<Self>;
	type MaxUnlockingChunks = ConstU32<32>;
	type HistoryDepth = ConstU32<84>;
	type OnStakerSlash = ();
	type BenchmarkingConfig = pallet_staking::TestBenchmarkingConfig;
	type WeightInfo = ();
}

impl pallet_offences::Config for Test {
	type RuntimeEvent = RuntimeEvent;
	type IdentificationTuple = pallet_session::historical::IdentificationTuple<Self>;
	type OnOffenceHandler = Staking;
}

// Note, that we can't use `UintAuthorityId` here. Reason is that the implementation
// of `to_public_key()` assumes, that a public key is 32 bytes long. This is true for
// ed25519 and sr25519 but *not* for ecdsa. A compressed ecdsa public key is 33 bytes,
// with the first one containing information to reconstruct the uncompressed key.
pub fn mock_beefy_id(id: u8) -> BeefyId {
	let mut buf: [u8; 33] = [id; 33];
	// Set to something valid.
	buf[0] = 0x02;
	let pk = Public::from_raw(buf);
	BeefyId::from(pk)
}

pub fn mock_authorities(vec: Vec<u8>) -> Vec<BeefyId> {
	vec.into_iter().map(|id| mock_beefy_id(id)).collect()
}

pub fn new_test_ext(ids: Vec<u8>) -> TestExternalities {
	new_test_ext_raw_authorities(mock_authorities(ids))
}

pub fn new_test_ext_raw_authorities(authorities: Vec<BeefyId>) -> TestExternalities {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();

	let balances: Vec<_> = (0..authorities.len()).map(|i| (i as u64, 10_000_000)).collect();

	pallet_balances::GenesisConfig::<Test> { balances }
		.assimilate_storage(&mut t)
		.unwrap();

	let session_keys: Vec<_> = authorities
		.iter()
		.enumerate()
		.map(|(i, k)| (i as u64, i as u64, MockSessionKeys { dummy: k.clone() }))
		.collect();

	BasicExternalities::execute_with_storage(&mut t, || {
		for (ref id, ..) in &session_keys {
			frame_system::Pallet::<Test>::inc_providers(id);
		}
	});

	pallet_session::GenesisConfig::<Test> { keys: session_keys }
		.assimilate_storage(&mut t)
		.unwrap();

	// controllers are the index + 1000
	let stakers: Vec<_> = (0..authorities.len())
		.map(|i| {
			(i as u64, i as u64 + 1000, 10_000, pallet_staking::StakerStatus::<u64>::Validator)
		})
		.collect();

	let staking_config = pallet_staking::GenesisConfig::<Test> {
		stakers,
		validator_count: 2,
		force_era: pallet_staking::Forcing::ForceNew,
		minimum_validator_count: 0,
		invulnerables: vec![],
		..Default::default()
	};

	staking_config.assimilate_storage(&mut t).unwrap();

	t.into()
}

pub fn start_session(session_index: SessionIndex) {
	for i in Session::current_index()..session_index {
		System::on_finalize(System::block_number());
		Session::on_finalize(System::block_number());
		Staking::on_finalize(System::block_number());
		Beefy::on_finalize(System::block_number());

		let parent_hash = if System::block_number() > 1 {
			let hdr = System::finalize();
			hdr.hash()
		} else {
			System::parent_hash()
		};

		System::reset_events();
		System::initialize(&(i as u64 + 1), &parent_hash, &Default::default());
		System::set_block_number((i + 1).into());
		Timestamp::set_timestamp(System::block_number() * 6000);

		System::on_initialize(System::block_number());
		Session::on_initialize(System::block_number());
		Staking::on_initialize(System::block_number());
		Beefy::on_initialize(System::block_number());
	}

	assert_eq!(Session::current_index(), session_index);
}

pub fn start_era(era_index: EraIndex) {
	start_session((era_index * 3).into());
	assert_eq!(Staking::current_era(), Some(era_index));
}