//! Mocks for the tokens module.

#![cfg(test)]

use frame_support::{
	impl_outer_event, impl_outer_origin, parameter_types,
	traits::{ChangeMembers, Contains, ContainsLengthBound, CurrencyToVote},
};
use frame_system as system;
use sp_core::H256;
use sp_runtime::{testing::Header, traits::IdentityLookup, ModuleId, Perbill, Percent, Permill};
use sp_std::cell::RefCell;
use std::collections::HashMap;

use super::*;

impl_outer_origin! {
	pub enum Origin for Runtime {}
}

mod tokens {
	pub use crate::Event;
}

impl_outer_event! {
	pub enum TestEvent for Runtime {
		frame_system<T>,
		tokens<T>,
		pallet_treasury<T>,
		pallet_elections_phragmen<T>,
	}
}

// Workaround for https://github.com/rust-lang/rust/issues/26925 . Remove when sorted.
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct Runtime;
parameter_types! {
	pub const BlockHashCount: u64 = 250;
	pub const MaximumBlockWeight: u32 = 1024;
	pub const MaximumBlockLength: u32 = 2 * 1024;
	pub const AvailableBlockRatio: Perbill = Perbill::one();
}

type AccountId = u64;
impl frame_system::Trait for Runtime {
	type Origin = Origin;
	type Call = ();
	type Index = u64;
	type BlockNumber = u64;
	type Hash = H256;
	type Hashing = ::sp_runtime::traits::BlakeTwo256;
	type AccountId = AccountId;
	type Lookup = IdentityLookup<Self::AccountId>;
	type Header = Header;
	type Event = TestEvent;
	type BlockHashCount = BlockHashCount;
	type MaximumBlockWeight = MaximumBlockWeight;
	type MaximumBlockLength = MaximumBlockLength;
	type AvailableBlockRatio = AvailableBlockRatio;
	type Version = ();
	type PalletInfo = ();
	type AccountData = ();
	type OnNewAccount = ();
	type OnKilledAccount = ();
	type DbWeight = ();
	type BlockExecutionWeight = ();
	type ExtrinsicBaseWeight = ();
	type MaximumExtrinsicWeight = ();
	type BaseCallFilter = ();
	type SystemWeightInfo = ();
}
pub type System = system::Module<Runtime>;

type CurrencyId = u32;
pub type Balance = u64;

thread_local! {
	pub static ACCUMULATED_RECEIVED: RefCell<HashMap<(AccountId, CurrencyId), Balance>> = RefCell::new(HashMap::new());
}

pub struct MockOnReceived;
impl OnReceived<AccountId, CurrencyId, Balance> for MockOnReceived {
	fn on_received(who: &AccountId, currency_id: CurrencyId, amount: Balance) {
		ACCUMULATED_RECEIVED.with(|v| {
			let mut old_map = v.borrow().clone();
			if let Some(before) = old_map.get_mut(&(*who, currency_id)) {
				*before += amount;
			} else {
				old_map.insert((*who, currency_id), amount);
			};

			*v.borrow_mut() = old_map;
		});
	}
}

thread_local! {
	static TEN_TO_FOURTEEN: RefCell<Vec<u64>> = RefCell::new(vec![10,11,12,13,14]);
}
pub struct TenToFourteen;
impl Contains<u64> for TenToFourteen {
	fn sorted_members() -> Vec<u64> {
		TEN_TO_FOURTEEN.with(|v| v.borrow().clone())
	}
	#[cfg(feature = "runtime-benchmarks")]
	fn add(new: &u64) {
		TEN_TO_FOURTEEN.with(|v| {
			let mut members = v.borrow_mut();
			members.push(*new);
			members.sort();
		})
	}
}
impl ContainsLengthBound for TenToFourteen {
	fn max_len() -> usize {
		TEN_TO_FOURTEEN.with(|v| v.borrow().len())
	}
	fn min_len() -> usize {
		0
	}
}

parameter_types! {
	pub const ProposalBond: Permill = Permill::from_percent(5);
	pub const ProposalBondMinimum: u64 = 1;
	pub const TipCountdown: u64 = 1;
	pub const TipFindersFee: Percent = Percent::from_percent(20);
	pub const TipReportDepositBase: u64 = 1;
	pub const DataDepositPerByte: u64 = 1;
	pub const SpendPeriod: u64 = 2;
	pub const Burn: Permill = Permill::from_percent(50);
	pub const TreasuryModuleId: ModuleId = ModuleId(*b"py/trsry");
	pub const GetTokenId: CurrencyId = TEST_TOKEN_ID;
}

impl pallet_treasury::Trait for Runtime {
	type ModuleId = TreasuryModuleId;
	type Currency = CurrencyAdapter<Runtime, GetTokenId>;
	type ApproveOrigin = frame_system::EnsureRoot<u64>;
	type RejectOrigin = frame_system::EnsureRoot<u64>;
	type Tippers = TenToFourteen;
	type TipCountdown = TipCountdown;
	type TipFindersFee = TipFindersFee;
	type TipReportDepositBase = TipReportDepositBase;
	type DataDepositPerByte = DataDepositPerByte;
	type Event = TestEvent;
	type OnSlash = ();
	type ProposalBond = ProposalBond;
	type ProposalBondMinimum = ProposalBondMinimum;
	type SpendPeriod = SpendPeriod;
	type Burn = Burn;
	type BurnDestination = (); // Just gets burned.
	type BountyDepositBase = ();
	type BountyDepositPayoutDelay = ();
	type BountyUpdatePeriod = ();
	type BountyCuratorDeposit = ();
	type BountyValueMinimum = ();
	type MaximumReasonLength = ();
	type WeightInfo = ();
}

pub struct CurrencyToVoteHandler;
impl CurrencyToVote<u64> for CurrencyToVoteHandler {
	fn to_vote(value: u64, _issuance: u64) -> u64 {
		value
	}

	fn to_currency(value: u128, _issuance: u64) -> u64 {
		value as u64
	}
}
parameter_types! {
	pub const CandidacyBond: u64 = 3;
}

thread_local! {
	static VOTING_BOND: RefCell<u64> = RefCell::new(2);
	static DESIRED_MEMBERS: RefCell<u32> = RefCell::new(2);
	static DESIRED_RUNNERS_UP: RefCell<u32> = RefCell::new(2);
	static TERM_DURATION: RefCell<u64> = RefCell::new(5);
}

pub struct VotingBond;
impl Get<u64> for VotingBond {
	fn get() -> u64 {
		VOTING_BOND.with(|v| *v.borrow())
	}
}

pub struct DesiredMembers;
impl Get<u32> for DesiredMembers {
	fn get() -> u32 {
		DESIRED_MEMBERS.with(|v| *v.borrow())
	}
}

pub struct DesiredRunnersUp;
impl Get<u32> for DesiredRunnersUp {
	fn get() -> u32 {
		DESIRED_RUNNERS_UP.with(|v| *v.borrow())
	}
}

pub struct TermDuration;
impl Get<u64> for TermDuration {
	fn get() -> u64 {
		TERM_DURATION.with(|v| *v.borrow())
	}
}

thread_local! {
	pub static MEMBERS: RefCell<Vec<u64>> = RefCell::new(vec![]);
	pub static PRIME: RefCell<Option<u64>> = RefCell::new(None);
}

pub struct TestChangeMembers;
impl ChangeMembers<u64> for TestChangeMembers {
	fn change_members_sorted(incoming: &[u64], outgoing: &[u64], new: &[u64]) {
		// new, incoming, outgoing must be sorted.
		let mut new_sorted = new.to_vec();
		new_sorted.sort();
		assert_eq!(new, &new_sorted[..]);

		let mut incoming_sorted = incoming.to_vec();
		incoming_sorted.sort();
		assert_eq!(incoming, &incoming_sorted[..]);

		let mut outgoing_sorted = outgoing.to_vec();
		outgoing_sorted.sort();
		assert_eq!(outgoing, &outgoing_sorted[..]);

		// incoming and outgoing must be disjoint
		for x in incoming.iter() {
			assert!(outgoing.binary_search(x).is_err());
		}

		let mut old_plus_incoming = MEMBERS.with(|m| m.borrow().to_vec());
		old_plus_incoming.extend_from_slice(incoming);
		old_plus_incoming.sort();

		let mut new_plus_outgoing = new.to_vec();
		new_plus_outgoing.extend_from_slice(outgoing);
		new_plus_outgoing.sort();

		assert_eq!(
			old_plus_incoming, new_plus_outgoing,
			"change members call is incorrect!"
		);

		MEMBERS.with(|m| *m.borrow_mut() = new.to_vec());
		PRIME.with(|p| *p.borrow_mut() = None);
	}

	fn set_prime(who: Option<u64>) {
		PRIME.with(|p| *p.borrow_mut() = who);
	}
}

parameter_types! {
	pub const ElectionsPhragmenModuleId: LockIdentifier = *b"phrelect";
}

impl pallet_elections_phragmen::Trait for Runtime {
	type ModuleId = ElectionsPhragmenModuleId;
	type Event = TestEvent;
	type Currency = CurrencyAdapter<Runtime, GetTokenId>;
	type CurrencyToVote = CurrencyToVoteHandler;
	type ChangeMembers = TestChangeMembers;
	type InitializeMembers = ();
	type CandidacyBond = CandidacyBond;
	type VotingBond = VotingBond;
	type TermDuration = TermDuration;
	type DesiredMembers = DesiredMembers;
	type DesiredRunnersUp = DesiredRunnersUp;
	type LoserCandidate = ();
	type KickedMember = ();
	type BadReport = ();
	type WeightInfo = ();
}

impl Trait for Runtime {
	type Event = TestEvent;
	type Balance = Balance;
	type Amount = i64;
	type CurrencyId = CurrencyId;
	type OnReceived = MockOnReceived;
	type WeightInfo = ();
}

pub type Tokens = Module<Runtime>;
pub type TreasuryCurrencyAdapter = <Runtime as pallet_treasury::Trait>::Currency;

pub const TEST_TOKEN_ID: CurrencyId = 1;
pub const ALICE: AccountId = 1;
pub const BOB: AccountId = 2;
pub const TREASURY_ACCOUNT: AccountId = 3;
pub const ID_1: LockIdentifier = *b"1       ";
pub const ID_2: LockIdentifier = *b"2       ";

pub struct ExtBuilder {
	endowed_accounts: Vec<(AccountId, CurrencyId, Balance)>,
	treasury_genesis: bool,
}

impl Default for ExtBuilder {
	fn default() -> Self {
		Self {
			endowed_accounts: vec![],
			treasury_genesis: false,
		}
	}
}

impl ExtBuilder {
	pub fn balances(mut self, endowed_accounts: Vec<(AccountId, CurrencyId, Balance)>) -> Self {
		self.endowed_accounts = endowed_accounts;
		self
	}

	pub fn one_hundred_for_alice_n_bob(self) -> Self {
		self.balances(vec![(ALICE, TEST_TOKEN_ID, 100), (BOB, TEST_TOKEN_ID, 100)])
	}

	pub fn one_hundred_for_treasury_account(mut self) -> Self {
		self.treasury_genesis = true;
		self.balances(vec![(TREASURY_ACCOUNT, TEST_TOKEN_ID, 100)])
	}

	pub fn build(self) -> sp_io::TestExternalities {
		let mut t = frame_system::GenesisConfig::default()
			.build_storage::<Runtime>()
			.unwrap();

		GenesisConfig::<Runtime> {
			endowed_accounts: self.endowed_accounts,
		}
		.assimilate_storage(&mut t)
		.unwrap();

		if self.treasury_genesis {
			pallet_treasury::GenesisConfig::default()
				.assimilate_storage::<Runtime, _>(&mut t)
				.unwrap();

			pallet_elections_phragmen::GenesisConfig::<Runtime> {
				members: vec![(TREASURY_ACCOUNT, 10)],
			}
			.assimilate_storage(&mut t)
			.unwrap();
		}

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