// This file is part of Substrate.

// Copyright (C) 2018-2022 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.

//! Test utilities

#![cfg(test)]

use crate::{self as pallet_balances, decl_tests, Config, Pallet};
use frame_support::{
	dispatch::DispatchInfo,
	parameter_types,
	traits::{ConstU32, ConstU64, ConstU8, StorageMapShim},
	weights::{IdentityFee, Weight},
};
use pallet_transaction_payment::CurrencyAdapter;
use sp_core::H256;
use sp_io;
use sp_runtime::{testing::Header, traits::IdentityLookup};

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

frame_support::construct_runtime!(
	pub struct Test where
		Block = Block,
		NodeBlock = Block,
		UncheckedExtrinsic = UncheckedExtrinsic,
	{
		System: frame_system::{Pallet, Call, Config, Storage, Event<T>},
		Balances: pallet_balances::{Pallet, Call, Storage, Config<T>, Event<T>},
		TransactionPayment: pallet_transaction_payment::{Pallet, Storage, Event<T>},
	}
);

parameter_types! {
	pub BlockWeights: frame_system::limits::BlockWeights =
		frame_system::limits::BlockWeights::simple_max(frame_support::weights::Weight::from_ref_time(1024));
	pub static ExistentialDeposit: u64 = 0;
}
impl frame_system::Config for Test {
	type BaseCallFilter = frame_support::traits::Everything;
	type BlockWeights = BlockWeights;
	type BlockLength = ();
	type DbWeight = ();
	type RuntimeOrigin = RuntimeOrigin;
	type Index = u64;
	type BlockNumber = u64;
	type RuntimeCall = RuntimeCall;
	type Hash = H256;
	type Hashing = ::sp_runtime::traits::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 = ();
	type OnNewAccount = ();
	type OnKilledAccount = ();
	type SystemWeightInfo = ();
	type SS58Prefix = ();
	type OnSetCode = ();
	type MaxConsumers = frame_support::traits::ConstU32<16>;
}

impl pallet_transaction_payment::Config for Test {
	type RuntimeEvent = RuntimeEvent;
	type OnChargeTransaction = CurrencyAdapter<Pallet<Test>, ()>;
	type OperationalFeeMultiplier = ConstU8<5>;
	type WeightToFee = IdentityFee<u64>;
	type LengthToFee = IdentityFee<u64>;
	type FeeMultiplierUpdate = ();
}

impl Config for Test {
	type Balance = u64;
	type DustRemoval = ();
	type RuntimeEvent = RuntimeEvent;
	type ExistentialDeposit = ExistentialDeposit;
	type AccountStore =
		StorageMapShim<super::Account<Test>, system::Provider<Test>, u64, super::AccountData<u64>>;
	type MaxLocks = ConstU32<50>;
	type MaxReserves = ConstU32<2>;
	type ReserveIdentifier = [u8; 8];
	type WeightInfo = ();
}

pub struct ExtBuilder {
	existential_deposit: u64,
	monied: bool,
}
impl Default for ExtBuilder {
	fn default() -> Self {
		Self { existential_deposit: 1, monied: false }
	}
}
impl ExtBuilder {
	pub fn existential_deposit(mut self, existential_deposit: u64) -> Self {
		self.existential_deposit = existential_deposit;
		self
	}
	pub fn monied(mut self, monied: bool) -> Self {
		self.monied = monied;
		if self.existential_deposit == 0 {
			self.existential_deposit = 1;
		}
		self
	}
	pub fn set_associated_consts(&self) {
		EXISTENTIAL_DEPOSIT.with(|v| *v.borrow_mut() = self.existential_deposit);
	}
	pub fn build(self) -> sp_io::TestExternalities {
		self.set_associated_consts();
		let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
		pallet_balances::GenesisConfig::<Test> {
			balances: if self.monied {
				vec![
					(1, 10 * self.existential_deposit),
					(2, 20 * self.existential_deposit),
					(3, 30 * self.existential_deposit),
					(4, 40 * self.existential_deposit),
					(12, 10 * self.existential_deposit),
				]
			} else {
				vec![]
			},
		}
		.assimilate_storage(&mut t)
		.unwrap();

		let mut ext = sp_io::TestExternalities::new(t);
		ext.execute_with(|| System::set_block_number(1));
		ext
	}
}

decl_tests! { Test, ExtBuilder, EXISTENTIAL_DEPOSIT }

#[test]
fn emit_events_with_no_existential_deposit_suicide_with_dust() {
	<ExtBuilder>::default().existential_deposit(2).build().execute_with(|| {
		assert_ok!(Balances::set_balance(RawOrigin::Root.into(), 1, 100, 0));

		assert_eq!(
			events(),
			[
				RuntimeEvent::System(system::Event::NewAccount { account: 1 }),
				RuntimeEvent::Balances(crate::Event::Endowed { account: 1, free_balance: 100 }),
				RuntimeEvent::Balances(crate::Event::BalanceSet { who: 1, free: 100, reserved: 0 }),
			]
		);

		let res = Balances::slash(&1, 98);
		assert_eq!(res, (NegativeImbalance::new(98), 0));

		// no events
		assert_eq!(
			events(),
			[RuntimeEvent::Balances(crate::Event::Slashed { who: 1, amount: 98 })]
		);

		let res = Balances::slash(&1, 1);
		assert_eq!(res, (NegativeImbalance::new(1), 0));

		assert_eq!(
			events(),
			[
				RuntimeEvent::System(system::Event::KilledAccount { account: 1 }),
				RuntimeEvent::Balances(crate::Event::DustLost { account: 1, amount: 1 }),
				RuntimeEvent::Balances(crate::Event::Slashed { who: 1, amount: 1 })
			]
		);
	});
}