// Copyright 2018-2020 Parity Technologies (UK) Ltd.
// This file is part of Substrate.

// Substrate is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Substrate is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.

use node_runtime::{
	Executive, Indices, Runtime, UncheckedExtrinsic,
};
use sp_application_crypto::AppKey;
use sp_core::testing::KeyStore;
use sp_core::{
	offchain::{
		TransactionPoolExt,
		testing::TestTransactionPoolExt,
	},
	traits::KeystoreExt,
};
use frame_system::{
	offchain::{
		Signer,
		SubmitTransaction,
		SendSignedTransaction,
	}
};
use codec::Decode;

pub mod common;
use self::common::*;

#[test]
fn should_submit_unsigned_transaction() {
	let mut t = new_test_ext(COMPACT_CODE, false);
	let (pool, state) = TestTransactionPoolExt::new();
	t.register_extension(TransactionPoolExt::new(pool));

	t.execute_with(|| {
		let signature = Default::default();
		let heartbeat_data = pallet_im_online::Heartbeat {
			block_number: 1,
			network_state: Default::default(),
			session_index: 1,
			authority_index: 0,
			validators_len: 0,
		};

		let call = pallet_im_online::Call::heartbeat(heartbeat_data, signature);
		SubmitTransaction::<Runtime, pallet_im_online::Call<Runtime>>::submit_unsigned_transaction(call.into())
			.unwrap();

		assert_eq!(state.read().transactions.len(), 1)
	});
}

const PHRASE: &str = "news slush supreme milk chapter athlete soap sausage put clutch what kitten";

#[test]
fn should_submit_signed_transaction() {
	let mut t = new_test_ext(COMPACT_CODE, false);
	let (pool, state) = TestTransactionPoolExt::new();
	t.register_extension(TransactionPoolExt::new(pool));

	let keystore = KeyStore::new();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter1", PHRASE))).unwrap();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter2", PHRASE))).unwrap();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter3", PHRASE))).unwrap();
	t.register_extension(KeystoreExt(keystore));

	t.execute_with(|| {
		let results = Signer::<Runtime, TestAuthorityId>::all_accounts()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});

		let len = results.len();
		assert_eq!(len, 3);
		assert_eq!(results.into_iter().filter_map(|x| x.1.ok()).count(), len);
		assert_eq!(state.read().transactions.len(), len);
	});
}

#[test]
fn should_submit_signed_twice_from_the_same_account() {
	let mut t = new_test_ext(COMPACT_CODE, false);
	let (pool, state) = TestTransactionPoolExt::new();
	t.register_extension(TransactionPoolExt::new(pool));

	let keystore = KeyStore::new();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter1", PHRASE))).unwrap();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter2", PHRASE))).unwrap();
	t.register_extension(KeystoreExt(keystore));

	t.execute_with(|| {
		let result = Signer::<Runtime, TestAuthorityId>::any_account()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});

		assert!(result.is_some());
		assert_eq!(state.read().transactions.len(), 1);

		// submit another one from the same account. The nonce should be incremented.
		let result = Signer::<Runtime, TestAuthorityId>::any_account()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});

		assert!(result.is_some());
		assert_eq!(state.read().transactions.len(), 2);

		// now check that the transaction nonces are not equal
		let s = state.read();
		fn nonce(tx: UncheckedExtrinsic) -> frame_system::CheckNonce<Runtime> {
			let extra = tx.signature.unwrap().2;
			extra.3
		}
		let nonce1 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[0]).unwrap());
		let nonce2 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[1]).unwrap());
		assert!(
			nonce1 != nonce2,
			"Transactions should have different nonces. Got: {:?}", nonce1
		);
	});
}

#[test]
fn should_submit_signed_twice_from_all_accounts() {
	let mut t = new_test_ext(COMPACT_CODE, false);
	let (pool, state) = TestTransactionPoolExt::new();
	t.register_extension(TransactionPoolExt::new(pool));

	let keystore = KeyStore::new();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter1", PHRASE))).unwrap();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter2", PHRASE))).unwrap();
	t.register_extension(KeystoreExt(keystore));

	t.execute_with(|| {
		let results = Signer::<Runtime, TestAuthorityId>::all_accounts()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});

		let len = results.len();
		assert_eq!(len, 2);
		assert_eq!(results.into_iter().filter_map(|x| x.1.ok()).count(), len);
		assert_eq!(state.read().transactions.len(), 2);

		// submit another one from the same account. The nonce should be incremented.
		let results = Signer::<Runtime, TestAuthorityId>::all_accounts()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});

		let len = results.len();
		assert_eq!(len, 2);
		assert_eq!(results.into_iter().filter_map(|x| x.1.ok()).count(), len);
		assert_eq!(state.read().transactions.len(), 4);

		// now check that the transaction nonces are not equal
		let s = state.read();
		fn nonce(tx: UncheckedExtrinsic) -> frame_system::CheckNonce<Runtime> {
			let extra = tx.signature.unwrap().2;
			extra.3
		}
		let nonce1 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[0]).unwrap());
		let nonce2 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[1]).unwrap());
		let nonce3 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[2]).unwrap());
		let nonce4 = nonce(UncheckedExtrinsic::decode(&mut &*s.transactions[3]).unwrap());
		assert!(
			nonce1 != nonce3,
			"Transactions should have different nonces. Got: 1st tx nonce: {:?}, 2nd nonce: {:?}", nonce1, nonce3
		);
		assert!(
			nonce2 != nonce4,
			"Transactions should have different nonces. Got: 1st tx nonce: {:?}, 2nd tx nonce: {:?}", nonce2, nonce4
		);
	});
}

#[test]
fn submitted_transaction_should_be_valid() {
	use codec::Encode;
	use frame_support::storage::StorageMap;
	use sp_runtime::transaction_validity::{ValidTransaction, TransactionSource};
	use sp_runtime::traits::StaticLookup;

	let mut t = new_test_ext(COMPACT_CODE, false);
	let (pool, state) = TestTransactionPoolExt::new();
	t.register_extension(TransactionPoolExt::new(pool));

	let keystore = KeyStore::new();
	keystore.write().sr25519_generate_new(sr25519::AuthorityId::ID, Some(&format!("{}/hunter1", PHRASE))).unwrap();
	t.register_extension(KeystoreExt(keystore));

	t.execute_with(|| {
		let results = Signer::<Runtime, TestAuthorityId>::all_accounts()
			.send_signed_transaction(|_| {
				pallet_balances::Call::transfer(Default::default(), Default::default())
			});
		let len = results.len();
		assert_eq!(len, 1);
		assert_eq!(results.into_iter().filter_map(|x| x.1.ok()).count(), len);
	});

	// check that transaction is valid, but reset environment storage,
	// since CreateTransaction increments the nonce
	let tx0 = state.read().transactions[0].clone();
	let mut t = new_test_ext(COMPACT_CODE, false);
	t.execute_with(|| {
		let source = TransactionSource::External;
		let extrinsic = UncheckedExtrinsic::decode(&mut &*tx0).unwrap();
		// add balance to the account
		let author = extrinsic.signature.clone().unwrap().0;
		let address = Indices::lookup(author).unwrap();
		let data = pallet_balances::AccountData { free: 5_000_000_000_000, ..Default::default() };
		let account = frame_system::AccountInfo { nonce: 0u32, refcount: 0u8, data };
		<frame_system::Account<Runtime>>::insert(&address, account);

		// check validity
		let res = Executive::validate_transaction(source, extrinsic);

		assert_eq!(res.unwrap(), ValidTransaction {
			priority: 1_410_710_000_000,
			requires: vec![],
			provides: vec![(address, 0).encode()],
			longevity: 2048,
			propagate: true,
		});
	});
}