// 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_support::{
	construct_runtime, parameter_types,
	sp_io::TestExternalities,
	traits::{ConstU16, ConstU32, ConstU64, GenesisBuild},
	BasicExternalities,
};
use sp_core::H256;
use sp_runtime::{
	app_crypto::ecdsa::Public,
	impl_opaque_keys,
	testing::Header,
	traits::{BlakeTwo256, ConvertInto, IdentityLookup, OpaqueKeys},
	Perbill,
};

use crate as pallet_beefy;

pub use beefy_primitives::{crypto::AuthorityId as BeefyId, ConsensusLog, 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::{Pallet, Call, Config, Storage, Event<T>},
		Beefy: pallet_beefy::{Pallet, Config<T>, Storage},
		Session: pallet_session::{Pallet, Call, Storage, Event, Config<T>},
	}
);

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

impl pallet_beefy::Config for Test {
	type BeefyId = BeefyId;
	type MaxAuthorities = ConstU32<100>;
}

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

impl pallet_session::Config for Test {
	type Event = Event;
	type ValidatorId = u64;
	type ValidatorIdOf = ConvertInto;
	type ShouldEndSession = pallet_session::PeriodicSessions<ConstU64<1>, ConstU64<0>>;
	type NextSessionRotation = pallet_session::PeriodicSessions<ConstU64<1>, ConstU64<0>>;
	type SessionManager = MockSessionManager;
	type SessionHandler = <MockSessionKeys as OpaqueKeys>::KeyTypeIdProviders;
	type Keys = MockSessionKeys;
	type WeightInfo = ();
}

pub struct MockSessionManager;

impl pallet_session::SessionManager<u64> for MockSessionManager {
	fn end_session(_: sp_staking::SessionIndex) {}
	fn start_session(_: sp_staking::SessionIndex) {}
	fn new_session(idx: sp_staking::SessionIndex) -> Option<Vec<u64>> {
		if idx == 0 || idx == 1 {
			Some(vec![1, 2])
		} else if idx == 2 {
			Some(vec![3, 4])
		} else {
			None
		}
	}
}

// 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<(u64, BeefyId)> {
	vec.into_iter().map(|id| ((id as u64), 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<(u64, BeefyId)>) -> TestExternalities {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();

	let session_keys: Vec<_> = authorities
		.iter()
		.map(|id| (id.0 as u64, id.0 as u64, MockSessionKeys { dummy: id.1.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();

	t.into()
}