// This file is part of Substrate.

// Copyright (C) 2020-2022 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.

//! bounties pallet tests.

#![cfg(test)]

use super::*;
use crate as pallet_bounties;
use std::cell::RefCell;

use frame_support::{
	assert_noop, assert_ok,
	pallet_prelude::GenesisBuild,
	parameter_types,
	traits::{ConstU32, ConstU64, OnInitialize},
	PalletId,
};

use sp_core::H256;
use sp_runtime::{
	testing::Header,
	traits::{BadOrigin, BlakeTwo256, IdentityLookup},
	Perbill, Storage,
};

use super::Event as BountiesEvent;

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

frame_support::construct_runtime!(
	pub enum 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>},
		Bounties: pallet_bounties::{Pallet, Call, Storage, Event<T>},
		Treasury: pallet_treasury::{Pallet, Call, Storage, Config, Event<T>},
	}
);

parameter_types! {
	pub const AvailableBlockRatio: Perbill = Perbill::one();
}

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 Call = Call;
	type Hash = H256;
	type Hashing = BlakeTwo256;
	type AccountId = u128; // u64 is not enough to hold bytes used to generate bounty account
	type Lookup = IdentityLookup<Self::AccountId>;
	type Header = Header;
	type Event = Event;
	type BlockHashCount = ConstU64<250>;
	type Version = ();
	type PalletInfo = PalletInfo;
	type AccountData = pallet_balances::AccountData<u64>;
	type OnNewAccount = ();
	type OnKilledAccount = ();
	type SystemWeightInfo = ();
	type SS58Prefix = ();
	type OnSetCode = ();
	type MaxConsumers = frame_support::traits::ConstU32<16>;
}

impl pallet_balances::Config for Test {
	type MaxLocks = ();
	type MaxReserves = ();
	type ReserveIdentifier = [u8; 8];
	type Balance = u64;
	type Event = Event;
	type DustRemoval = ();
	type ExistentialDeposit = ConstU64<1>;
	type AccountStore = System;
	type WeightInfo = ();
}
thread_local! {
	static TEN_TO_FOURTEEN: RefCell<Vec<u128>> = RefCell::new(vec![10,11,12,13,14]);
}
parameter_types! {
	pub const ProposalBond: Permill = Permill::from_percent(5);
	pub const Burn: Permill = Permill::from_percent(50);
	pub const TreasuryPalletId: PalletId = PalletId(*b"py/trsry");
}

// impl pallet_treasury::Config for Test {
impl pallet_treasury::Config for Test {
	type PalletId = TreasuryPalletId;
	type Currency = pallet_balances::Pallet<Test>;
	type ApproveOrigin = frame_system::EnsureRoot<u128>;
	type RejectOrigin = frame_system::EnsureRoot<u128>;
	type Event = Event;
	type OnSlash = ();
	type ProposalBond = ProposalBond;
	type ProposalBondMinimum = ConstU64<1>;
	type ProposalBondMaximum = ();
	type SpendPeriod = ConstU64<2>;
	type Burn = Burn;
	type BurnDestination = (); // Just gets burned.
	type WeightInfo = ();
	type SpendFunds = Bounties;
	type MaxApprovals = ConstU32<100>;
}
parameter_types! {
	pub const BountyCuratorDeposit: Permill = Permill::from_percent(50);
}
impl Config for Test {
	type Event = Event;
	type BountyDepositBase = ConstU64<80>;
	type BountyDepositPayoutDelay = ConstU64<3>;
	type BountyUpdatePeriod = ConstU64<20>;
	type BountyCuratorDeposit = BountyCuratorDeposit;
	type BountyValueMinimum = ConstU64<1>;
	type DataDepositPerByte = ConstU64<1>;
	type MaximumReasonLength = ConstU32<16384>;
	type WeightInfo = ();
	type ChildBountyManager = ();
}

type TreasuryError = pallet_treasury::Error<Test>;

pub fn new_test_ext() -> sp_io::TestExternalities {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	pallet_balances::GenesisConfig::<Test> {
		// Total issuance will be 200 with treasury account initialized at ED.
		balances: vec![(0, 100), (1, 98), (2, 1)],
	}
	.assimilate_storage(&mut t)
	.unwrap();
	GenesisBuild::<Test>::assimilate_storage(&pallet_treasury::GenesisConfig, &mut t).unwrap();
	t.into()
}

fn last_event() -> BountiesEvent<Test> {
	System::events()
		.into_iter()
		.map(|r| r.event)
		.filter_map(|e| if let Event::Bounties(inner) = e { Some(inner) } else { None })
		.last()
		.unwrap()
}

#[test]
fn genesis_config_works() {
	new_test_ext().execute_with(|| {
		assert_eq!(Treasury::pot(), 0);
		assert_eq!(Treasury::proposal_count(), 0);
	});
}

#[test]
fn minting_works() {
	new_test_ext().execute_with(|| {
		// Check that accumulate works when we have Some value in Dummy already.
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);
	});
}

#[test]
fn spend_proposal_takes_min_deposit() {
	new_test_ext().execute_with(|| {
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 1, 3));
		assert_eq!(Balances::free_balance(0), 99);
		assert_eq!(Balances::reserved_balance(0), 1);
	});
}

#[test]
fn spend_proposal_takes_proportional_deposit() {
	new_test_ext().execute_with(|| {
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 5);
	});
}

#[test]
fn spend_proposal_fails_when_proposer_poor() {
	new_test_ext().execute_with(|| {
		assert_noop!(
			Treasury::propose_spend(Origin::signed(2), 100, 3),
			TreasuryError::InsufficientProposersBalance,
		);
	});
}

#[test]
fn accepted_spend_proposal_ignored_outside_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(1);
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Treasury::pot(), 100);
	});
}

#[test]
fn unused_pot_should_diminish() {
	new_test_ext().execute_with(|| {
		let init_total_issuance = Balances::total_issuance();
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Balances::total_issuance(), init_total_issuance + 100);

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 50);
		assert_eq!(Balances::total_issuance(), init_total_issuance + 50);
	});
}

#[test]
fn rejected_spend_proposal_ignored_on_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Treasury::pot(), 50);
	});
}

#[test]
fn reject_already_rejected_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));
		assert_noop!(Treasury::reject_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn reject_non_existent_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		assert_noop!(
			Treasury::reject_proposal(Origin::root(), 0),
			pallet_treasury::Error::<Test, _>::InvalidIndex
		);
	});
}

#[test]
fn accept_non_existent_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		assert_noop!(Treasury::approve_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn accept_already_rejected_spend_proposal_fails() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::reject_proposal(Origin::root(), 0));
		assert_noop!(Treasury::approve_proposal(Origin::root(), 0), TreasuryError::InvalidIndex);
	});
}

#[test]
fn accepted_spend_proposal_enacted_on_spend_period() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 100, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Balances::free_balance(3), 100);
		assert_eq!(Treasury::pot(), 0);
	});
}

#[test]
fn pot_underflow_should_not_diminish() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 150, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 100); // Pot hasn't changed

		assert_ok!(Balances::deposit_into_existing(&Treasury::account_id(), 100));
		<Treasury as OnInitialize<u64>>::on_initialize(4);
		assert_eq!(Balances::free_balance(3), 150); // Fund has been spent
		assert_eq!(Treasury::pot(), 25); // Pot has finally changed
	});
}

// Treasury account doesn't get deleted if amount approved to spend is all its free balance.
// i.e. pot should not include existential deposit needed for account survival.
#[test]
fn treasury_account_doesnt_get_deleted() {
	new_test_ext().execute_with(|| {
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);
		let treasury_balance = Balances::free_balance(&Treasury::account_id());

		assert_ok!(Treasury::propose_spend(Origin::signed(0), treasury_balance, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));

		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 100); // Pot hasn't changed

		assert_ok!(Treasury::propose_spend(Origin::signed(0), Treasury::pot(), 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 1));

		<Treasury as OnInitialize<u64>>::on_initialize(4);
		assert_eq!(Treasury::pot(), 0); // Pot is emptied
		assert_eq!(Balances::free_balance(Treasury::account_id()), 1); // but the account is still there
	});
}

// In case treasury account is not existing then it works fine.
// This is useful for chain that will just update runtime.
#[test]
fn inexistent_account_works() {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	pallet_balances::GenesisConfig::<Test> { balances: vec![(0, 100), (1, 99), (2, 1)] }
		.assimilate_storage(&mut t)
		.unwrap();
	// Treasury genesis config is not build thus treasury account does not exist
	let mut t: sp_io::TestExternalities = t.into();

	t.execute_with(|| {
		assert_eq!(Balances::free_balance(Treasury::account_id()), 0); // Account does not exist
		assert_eq!(Treasury::pot(), 0); // Pot is empty

		assert_ok!(Treasury::propose_spend(Origin::signed(0), 99, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 0));
		assert_ok!(Treasury::propose_spend(Origin::signed(0), 1, 3));
		assert_ok!(Treasury::approve_proposal(Origin::root(), 1));
		<Treasury as OnInitialize<u64>>::on_initialize(2);
		assert_eq!(Treasury::pot(), 0); // Pot hasn't changed
		assert_eq!(Balances::free_balance(3), 0); // Balance of `3` hasn't changed

		Balances::make_free_balance_be(&Treasury::account_id(), 100);
		assert_eq!(Treasury::pot(), 99); // Pot now contains funds
		assert_eq!(Balances::free_balance(Treasury::account_id()), 100); // Account does exist

		<Treasury as OnInitialize<u64>>::on_initialize(4);

		assert_eq!(Treasury::pot(), 0); // Pot has changed
		assert_eq!(Balances::free_balance(3), 99); // Balance of `3` has changed
	});
}

#[test]
fn propose_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 10, b"1234567890".to_vec()));

		assert_eq!(last_event(), BountiesEvent::BountyProposed { index: 0 });

		let deposit: u64 = 85 + 5;
		assert_eq!(Balances::reserved_balance(0), deposit);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 0,
				curator_deposit: 0,
				value: 10,
				bond: deposit,
				status: BountyStatus::Proposed,
			}
		);

		assert_eq!(Bounties::bounty_descriptions(0).unwrap(), b"1234567890".to_vec());

		assert_eq!(Bounties::bounty_count(), 1);
	});
}

#[test]
fn propose_bounty_validation_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_eq!(Treasury::pot(), 100);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 0, [0; 17_000].to_vec()),
			Error::<Test>::ReasonTooBig
		);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 10, b"12345678901234567890".to_vec()),
			Error::<Test>::InsufficientProposersBalance
		);

		assert_noop!(
			Bounties::propose_bounty(Origin::signed(1), 0, b"12345678901234567890".to_vec()),
			Error::<Test>::InvalidValue
		);
	});
}

#[test]
fn close_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::InvalidIndex);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 10, b"12345".to_vec()));

		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		let deposit: u64 = 80 + 5;

		assert_eq!(last_event(), BountiesEvent::BountyRejected { index: 0, bond: deposit });

		assert_eq!(Balances::reserved_balance(0), 0);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		assert_eq!(Bounties::bounties(0), None);
		assert!(!pallet_treasury::Proposals::<Test, _>::contains_key(0));

		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn approve_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_noop!(Bounties::approve_bounty(Origin::root(), 0), Error::<Test>::InvalidIndex);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		let deposit: u64 = 80 + 5;

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 0,
				value: 50,
				curator_deposit: 0,
				bond: deposit,
				status: BountyStatus::Approved,
			}
		);
		assert_eq!(Bounties::bounty_approvals(), vec![0]);

		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::UnexpectedStatus);

		// deposit not returned yet
		assert_eq!(Balances::reserved_balance(0), deposit);
		assert_eq!(Balances::free_balance(0), 100 - deposit);

		<Treasury as OnInitialize<u64>>::on_initialize(2);

		// return deposit
		assert_eq!(Balances::reserved_balance(0), 0);
		assert_eq!(Balances::free_balance(0), 100);

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 0,
				curator_deposit: 0,
				value: 50,
				bond: deposit,
				status: BountyStatus::Funded,
			}
		);

		assert_eq!(Treasury::pot(), 100 - 50 - 25); // burn 25
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 50);
	});
}

#[test]
fn assign_curator_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_noop!(
			Bounties::propose_curator(Origin::root(), 0, 4, 4),
			Error::<Test>::InvalidIndex
		);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_noop!(
			Bounties::propose_curator(Origin::root(), 0, 4, 50),
			Error::<Test>::InvalidFee
		);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 4,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::CuratorProposed { curator: 4 },
			}
		);

		assert_noop!(Bounties::accept_curator(Origin::signed(1), 0), Error::<Test>::RequireCurator);
		assert_noop!(
			Bounties::accept_curator(Origin::signed(4), 0),
			pallet_balances::Error::<Test, _>::InsufficientBalance
		);

		Balances::make_free_balance_be(&4, 10);

		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 4,
				curator_deposit: 2,
				value: 50,
				bond: 85,
				status: BountyStatus::Active { curator: 4, update_due: 22 },
			}
		);

		assert_eq!(Balances::free_balance(&4), 8);
		assert_eq!(Balances::reserved_balance(&4), 2);
	});
}

#[test]
fn unassign_curator_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		assert_noop!(Bounties::unassign_curator(Origin::signed(1), 0), BadOrigin);

		assert_ok!(Bounties::unassign_curator(Origin::signed(4), 0));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 4,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::Funded,
			}
		);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));

		Balances::make_free_balance_be(&4, 10);

		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_ok!(Bounties::unassign_curator(Origin::root(), 0));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 4,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::Funded,
			}
		);

		assert_eq!(Balances::free_balance(&4), 8);
		assert_eq!(Balances::reserved_balance(&4), 0); // slashed 2
	});
}

#[test]
fn award_and_claim_bounty_works() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 10);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 4));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 8); // inital 10 - 2 deposit

		assert_noop!(
			Bounties::award_bounty(Origin::signed(1), 0, 3),
			Error::<Test>::RequireCurator
		);

		assert_ok!(Bounties::award_bounty(Origin::signed(4), 0, 3));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 4,
				curator_deposit: 2,
				value: 50,
				bond: 85,
				status: BountyStatus::PendingPayout { curator: 4, beneficiary: 3, unlock_at: 5 },
			}
		);

		assert_noop!(Bounties::claim_bounty(Origin::signed(1), 0), Error::<Test>::Premature);

		System::set_block_number(5);
		<Treasury as OnInitialize<u64>>::on_initialize(5);

		assert_ok!(Balances::transfer(Origin::signed(0), Bounties::bounty_account_id(0), 10));

		assert_ok!(Bounties::claim_bounty(Origin::signed(1), 0));

		assert_eq!(
			last_event(),
			BountiesEvent::BountyClaimed { index: 0, payout: 56, beneficiary: 3 }
		);

		assert_eq!(Balances::free_balance(4), 14); // initial 10 + fee 4

		assert_eq!(Balances::free_balance(3), 56);
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn claim_handles_high_fee() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 30);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 49));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_ok!(Bounties::award_bounty(Origin::signed(4), 0, 3));

		System::set_block_number(5);
		<Treasury as OnInitialize<u64>>::on_initialize(5);

		// make fee > balance
		let res = Balances::slash(&Bounties::bounty_account_id(0), 10);
		assert_eq!(res.0.peek(), 10);

		assert_ok!(Bounties::claim_bounty(Origin::signed(1), 0));

		assert_eq!(
			last_event(),
			BountiesEvent::BountyClaimed { index: 0, payout: 0, beneficiary: 3 }
		);

		assert_eq!(Balances::free_balance(4), 70); // 30 + 50 - 10
		assert_eq!(Balances::free_balance(3), 0);
		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn cancel_and_refund() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);

		Balances::make_free_balance_be(&Treasury::account_id(), 101);

		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Balances::transfer(Origin::signed(0), Bounties::bounty_account_id(0), 10));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 0,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::Funded,
			}
		);

		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 60);

		assert_noop!(Bounties::close_bounty(Origin::signed(0), 0), BadOrigin);

		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		// `- 25 + 10`
		assert_eq!(Treasury::pot(), 85);
	});
}

#[test]
fn award_and_cancel() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 0, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(0), 0));

		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 5);

		assert_ok!(Bounties::award_bounty(Origin::signed(0), 0, 3));

		// Cannot close bounty directly when payout is happening...
		assert_noop!(Bounties::close_bounty(Origin::root(), 0), Error::<Test>::PendingPayout);

		// Instead unassign the curator to slash them and then close.
		assert_ok!(Bounties::unassign_curator(Origin::root(), 0));
		assert_ok!(Bounties::close_bounty(Origin::root(), 0));

		assert_eq!(last_event(), BountiesEvent::BountyCanceled { index: 0 });

		assert_eq!(Balances::free_balance(Bounties::bounty_account_id(0)), 0);

		// Slashed.
		assert_eq!(Balances::free_balance(0), 95);
		assert_eq!(Balances::reserved_balance(0), 0);

		assert_eq!(Bounties::bounties(0), None);
		assert_eq!(Bounties::bounty_descriptions(0), None);
	});
}

#[test]
fn expire_and_unassign() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 1, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(1), 0));

		assert_eq!(Balances::free_balance(1), 93);
		assert_eq!(Balances::reserved_balance(1), 5);

		System::set_block_number(22);
		<Treasury as OnInitialize<u64>>::on_initialize(22);

		assert_noop!(Bounties::unassign_curator(Origin::signed(0), 0), Error::<Test>::Premature);

		System::set_block_number(23);
		<Treasury as OnInitialize<u64>>::on_initialize(23);

		assert_ok!(Bounties::unassign_curator(Origin::signed(0), 0));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 10,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::Funded,
			}
		);

		assert_eq!(Balances::free_balance(1), 93);
		assert_eq!(Balances::reserved_balance(1), 0); // slashed
	});
}

#[test]
fn extend_expiry() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		Balances::make_free_balance_be(&4, 10);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));

		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		assert_noop!(
			Bounties::extend_bounty_expiry(Origin::signed(1), 0, Vec::new()),
			Error::<Test>::UnexpectedStatus
		);

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 4, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 5);
		assert_eq!(Balances::reserved_balance(4), 5);

		System::set_block_number(10);
		<Treasury as OnInitialize<u64>>::on_initialize(10);

		assert_noop!(
			Bounties::extend_bounty_expiry(Origin::signed(0), 0, Vec::new()),
			Error::<Test>::RequireCurator
		);
		assert_ok!(Bounties::extend_bounty_expiry(Origin::signed(4), 0, Vec::new()));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 10,
				curator_deposit: 5,
				value: 50,
				bond: 85,
				status: BountyStatus::Active { curator: 4, update_due: 30 },
			}
		);

		assert_ok!(Bounties::extend_bounty_expiry(Origin::signed(4), 0, Vec::new()));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 10,
				curator_deposit: 5,
				value: 50,
				bond: 85,
				status: BountyStatus::Active { curator: 4, update_due: 30 }, // still the same
			}
		);

		System::set_block_number(25);
		<Treasury as OnInitialize<u64>>::on_initialize(25);

		assert_noop!(Bounties::unassign_curator(Origin::signed(0), 0), Error::<Test>::Premature);
		assert_ok!(Bounties::unassign_curator(Origin::signed(4), 0));

		assert_eq!(Balances::free_balance(4), 10); // not slashed
		assert_eq!(Balances::reserved_balance(4), 0);
	});
}

#[test]
fn test_migration_v4() {
	let mut s = Storage::default();

	let index: u32 = 10;

	let bounty = Bounty::<u128, u64, u64> {
		proposer: 0,
		value: 20,
		fee: 20,
		curator_deposit: 20,
		bond: 50,
		status: BountyStatus::<u128, u64>::Proposed,
	};

	let data = vec![
		(pallet_bounties::BountyCount::<Test>::hashed_key().to_vec(), 10.encode().to_vec()),
		(pallet_bounties::Bounties::<Test>::hashed_key_for(index), bounty.encode().to_vec()),
		(pallet_bounties::BountyDescriptions::<Test>::hashed_key_for(index), vec![0, 0]),
		(
			pallet_bounties::BountyApprovals::<Test>::hashed_key().to_vec(),
			vec![10 as u32].encode().to_vec(),
		),
	];

	s.top = data.into_iter().collect();

	sp_io::TestExternalities::new(s).execute_with(|| {
		use frame_support::traits::PalletInfo;
		let old_pallet_name = <Test as frame_system::Config>::PalletInfo::name::<Bounties>()
			.expect("Bounties is part of runtime, so it has a name; qed");
		let new_pallet_name = "NewBounties";

		crate::migrations::v4::pre_migration::<Test, Bounties, _>(old_pallet_name, new_pallet_name);
		crate::migrations::v4::migrate::<Test, Bounties, _>(old_pallet_name, new_pallet_name);
		crate::migrations::v4::post_migration::<Test, Bounties, _>(
			old_pallet_name,
			new_pallet_name,
		);
	});
}

#[test]
fn genesis_funding_works() {
	let mut t = frame_system::GenesisConfig::default().build_storage::<Test>().unwrap();
	let initial_funding = 100;
	pallet_balances::GenesisConfig::<Test> {
		// Total issuance will be 200 with treasury account initialized with 100.
		balances: vec![(0, 100), (Treasury::account_id(), initial_funding)],
	}
	.assimilate_storage(&mut t)
	.unwrap();
	GenesisBuild::<Test>::assimilate_storage(&pallet_treasury::GenesisConfig, &mut t).unwrap();
	let mut t: sp_io::TestExternalities = t.into();

	t.execute_with(|| {
		assert_eq!(Balances::free_balance(Treasury::account_id()), initial_funding);
		assert_eq!(Treasury::pot(), initial_funding - Balances::minimum_balance());
	});
}

#[test]
fn unassign_curator_self() {
	new_test_ext().execute_with(|| {
		System::set_block_number(1);
		Balances::make_free_balance_be(&Treasury::account_id(), 101);
		assert_ok!(Bounties::propose_bounty(Origin::signed(0), 50, b"12345".to_vec()));
		assert_ok!(Bounties::approve_bounty(Origin::root(), 0));

		System::set_block_number(2);
		<Treasury as OnInitialize<u64>>::on_initialize(2);

		assert_ok!(Bounties::propose_curator(Origin::root(), 0, 1, 10));
		assert_ok!(Bounties::accept_curator(Origin::signed(1), 0));

		assert_eq!(Balances::free_balance(1), 93);
		assert_eq!(Balances::reserved_balance(1), 5);

		System::set_block_number(8);
		<Treasury as OnInitialize<u64>>::on_initialize(8);

		assert_ok!(Bounties::unassign_curator(Origin::signed(1), 0));

		assert_eq!(
			Bounties::bounties(0).unwrap(),
			Bounty {
				proposer: 0,
				fee: 10,
				curator_deposit: 0,
				value: 50,
				bond: 85,
				status: BountyStatus::Funded,
			}
		);

		assert_eq!(Balances::free_balance(1), 98);
		assert_eq!(Balances::reserved_balance(1), 0); // not slashed
	});
}
