// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program 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.

// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.

//! Block construction benchmark.
//!
//! This benchmark is expected to measure block construction.
//! We want to protect against cold-cache attacks, and so this
//! benchmark should not rely on any caching (except those entries that
//! DO NOT depend on user input). Thus transaction generation should be
//! based on randomized data.

use futures::Future;
use std::{borrow::Cow, collections::HashMap, pin::Pin, sync::Arc};

use node_primitives::Block;
use node_testing::bench::{BenchDb, BlockType, DatabaseType, KeyTypes};
use sc_transaction_pool_api::{
	ImportNotificationStream, PoolFuture, PoolStatus, ReadyTransactions, TransactionFor,
	TransactionSource, TransactionStatusStreamFor, TxHash,
};
use sp_consensus::{Environment, Proposer};
use sp_inherents::InherentDataProvider;
use sp_runtime::{generic::BlockId, traits::NumberFor, OpaqueExtrinsic};

use crate::{
	common::SizeType,
	core::{self, Mode, Path},
};

pub struct ConstructionBenchmarkDescription {
	pub key_types: KeyTypes,
	pub block_type: BlockType,
	pub size: SizeType,
	pub database_type: DatabaseType,
}

pub struct ConstructionBenchmark {
	database: BenchDb,
	transactions: Transactions,
}

impl core::BenchmarkDescription for ConstructionBenchmarkDescription {
	fn path(&self) -> Path {
		let mut path = Path::new(&["node", "proposer"]);

		match self.key_types {
			KeyTypes::Sr25519 => path.push("sr25519"),
			KeyTypes::Ed25519 => path.push("ed25519"),
		}

		match self.block_type {
			BlockType::RandomTransfersKeepAlive => path.push("transfer"),
			BlockType::RandomTransfersReaping => path.push("transfer_reaping"),
			BlockType::Noop => path.push("noop"),
		}

		match self.database_type {
			DatabaseType::RocksDb => path.push("rocksdb"),
			DatabaseType::ParityDb => path.push("paritydb"),
		}

		path.push(&format!("{}", self.size));

		path
	}

	fn setup(self: Box<Self>) -> Box<dyn core::Benchmark> {
		let mut extrinsics: Vec<Arc<PoolTransaction>> = Vec::new();

		let mut bench_db = BenchDb::with_key_types(self.database_type, 50_000, self.key_types);

		let client = bench_db.client();

		let content_type = self.block_type.to_content(self.size.transactions());
		for transaction in bench_db.block_content(content_type, &client) {
			extrinsics.push(Arc::new(transaction.into()));
		}

		Box::new(ConstructionBenchmark {
			database: bench_db,
			transactions: Transactions(extrinsics),
		})
	}

	fn name(&self) -> Cow<'static, str> {
		format!(
			"Block construction ({:?}/{}, {:?} backend)",
			self.block_type, self.size, self.database_type,
		)
		.into()
	}
}

impl core::Benchmark for ConstructionBenchmark {
	fn run(&mut self, mode: Mode) -> std::time::Duration {
		let context = self.database.create_context();

		let _ = context
			.client
			.runtime_version_at(context.client.chain_info().genesis_hash)
			.expect("Failed to get runtime version")
			.spec_version;

		if mode == Mode::Profile {
			std::thread::park_timeout(std::time::Duration::from_secs(3));
		}

		let mut proposer_factory = sc_basic_authorship::ProposerFactory::new(
			context.spawn_handle.clone(),
			context.client.clone(),
			self.transactions.clone().into(),
			None,
			None,
		);
		let timestamp_provider = sp_timestamp::InherentDataProvider::from_system_time();

		let start = std::time::Instant::now();

		let proposer = futures::executor::block_on(
			proposer_factory.init(
				&context
					.client
					.header(context.client.chain_info().genesis_hash)
					.expect("Database error querying block #0")
					.expect("Block #0 should exist"),
			),
		)
		.expect("Proposer initialization failed");

		let inherent_data = futures::executor::block_on(timestamp_provider.create_inherent_data())
			.expect("Create inherent data failed");
		let _block = futures::executor::block_on(proposer.propose(
			inherent_data,
			Default::default(),
			std::time::Duration::from_secs(20),
			None,
		))
		.map(|r| r.block)
		.expect("Proposing failed");

		let elapsed = start.elapsed();

		if mode == Mode::Profile {
			std::thread::park_timeout(std::time::Duration::from_secs(1));
		}

		elapsed
	}
}

#[derive(Clone, Debug)]
pub struct PoolTransaction {
	data: OpaqueExtrinsic,
	hash: node_primitives::Hash,
}

impl From<OpaqueExtrinsic> for PoolTransaction {
	fn from(e: OpaqueExtrinsic) -> Self {
		PoolTransaction { data: e, hash: node_primitives::Hash::zero() }
	}
}

impl sc_transaction_pool_api::InPoolTransaction for PoolTransaction {
	type Transaction = OpaqueExtrinsic;
	type Hash = node_primitives::Hash;

	fn data(&self) -> &Self::Transaction {
		&self.data
	}

	fn hash(&self) -> &Self::Hash {
		&self.hash
	}

	fn priority(&self) -> &u64 {
		unimplemented!()
	}

	fn longevity(&self) -> &u64 {
		unimplemented!()
	}

	fn requires(&self) -> &[Vec<u8>] {
		unimplemented!()
	}

	fn provides(&self) -> &[Vec<u8>] {
		unimplemented!()
	}

	fn is_propagable(&self) -> bool {
		unimplemented!()
	}
}

#[derive(Clone, Debug)]
pub struct Transactions(Vec<Arc<PoolTransaction>>);
pub struct TransactionsIterator(std::vec::IntoIter<Arc<PoolTransaction>>);

impl Iterator for TransactionsIterator {
	type Item = Arc<PoolTransaction>;

	fn next(&mut self) -> Option<Self::Item> {
		self.0.next()
	}
}

impl ReadyTransactions for TransactionsIterator {
	fn report_invalid(&mut self, _tx: &Self::Item) {}
}

impl sc_transaction_pool_api::TransactionPool for Transactions {
	type Block = Block;
	type Hash = node_primitives::Hash;
	type InPoolTransaction = PoolTransaction;
	type Error = sc_transaction_pool_api::error::Error;

	/// Returns a future that imports a bunch of unverified transactions to the pool.
	fn submit_at(
		&self,
		_at: &BlockId<Self::Block>,
		_source: TransactionSource,
		_xts: Vec<TransactionFor<Self>>,
	) -> PoolFuture<Vec<Result<node_primitives::Hash, Self::Error>>, Self::Error> {
		unimplemented!()
	}

	/// Returns a future that imports one unverified transaction to the pool.
	fn submit_one(
		&self,
		_at: &BlockId<Self::Block>,
		_source: TransactionSource,
		_xt: TransactionFor<Self>,
	) -> PoolFuture<TxHash<Self>, Self::Error> {
		unimplemented!()
	}

	fn submit_and_watch(
		&self,
		_at: &BlockId<Self::Block>,
		_source: TransactionSource,
		_xt: TransactionFor<Self>,
	) -> PoolFuture<Pin<Box<TransactionStatusStreamFor<Self>>>, Self::Error> {
		unimplemented!()
	}

	fn ready_at(
		&self,
		_at: NumberFor<Self::Block>,
	) -> Pin<
		Box<
			dyn Future<
					Output = Box<dyn ReadyTransactions<Item = Arc<Self::InPoolTransaction>> + Send>,
				> + Send,
		>,
	> {
		let iter: Box<dyn ReadyTransactions<Item = Arc<PoolTransaction>> + Send> =
			Box::new(TransactionsIterator(self.0.clone().into_iter()));
		Box::pin(futures::future::ready(iter))
	}

	fn ready(&self) -> Box<dyn ReadyTransactions<Item = Arc<Self::InPoolTransaction>> + Send> {
		unimplemented!()
	}

	fn remove_invalid(&self, _hashes: &[TxHash<Self>]) -> Vec<Arc<Self::InPoolTransaction>> {
		Default::default()
	}

	fn status(&self) -> PoolStatus {
		unimplemented!()
	}

	fn import_notification_stream(&self) -> ImportNotificationStream<TxHash<Self>> {
		unimplemented!()
	}

	fn on_broadcasted(&self, _propagations: HashMap<TxHash<Self>, Vec<String>>) {
		unimplemented!()
	}

	fn hash_of(&self, _xt: &TransactionFor<Self>) -> TxHash<Self> {
		unimplemented!()
	}

	fn ready_transaction(&self, _hash: &TxHash<Self>) -> Option<Arc<Self::InPoolTransaction>> {
		unimplemented!()
	}
}