// Copyright 2019 The Grin Developers
//
// 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.

pub mod common;

use self::core::core::hash::Hash;
use self::core::core::{BlockHeader, BlockSums, Transaction};
use self::keychain::{ExtKeychain, Keychain};
use self::pool::types::{BlockChain, PoolError};
use self::util::RwLock;
use crate::common::*;
use epic_core as core;
use epic_keychain as keychain;
use epic_pool as pool;
use epic_util as util;
use std::sync::Arc;

#[derive(Clone)]
pub struct CoinbaseMaturityErrorChainAdapter {}

impl CoinbaseMaturityErrorChainAdapter {
	pub fn new() -> CoinbaseMaturityErrorChainAdapter {
		CoinbaseMaturityErrorChainAdapter {}
	}
}

impl BlockChain for CoinbaseMaturityErrorChainAdapter {
	fn chain_head(&self) -> Result<BlockHeader, PoolError> {
		unimplemented!();
	}

	fn get_block_header(&self, _hash: &Hash) -> Result<BlockHeader, PoolError> {
		unimplemented!();
	}

	fn get_block_sums(&self, _hash: &Hash) -> Result<BlockSums, PoolError> {
		unimplemented!();
	}

	fn validate_tx(&self, _tx: &Transaction) -> Result<(), PoolError> {
		unimplemented!();
	}

	// Returns an ImmatureCoinbase for every tx we pass in.
	fn verify_coinbase_maturity(&self, _tx: &Transaction) -> Result<(), PoolError> {
		Err(PoolError::ImmatureCoinbase)
	}

	// Mocking this out for these tests.
	fn verify_tx_lock_height(&self, _tx: &Transaction) -> Result<(), PoolError> {
		Ok(())
	}
}

/// Test we correctly verify coinbase maturity when adding txs to the pool.
#[test]
fn test_coinbase_maturity() {
	let keychain: ExtKeychain = Keychain::from_random_seed(false).unwrap();

	// Mocking this up with an adapter that will raise an error for coinbase
	// maturity.
	let chain = Arc::new(CoinbaseMaturityErrorChainAdapter::new());
	let pool = RwLock::new(test_setup(chain));

	{
		let mut write_pool = pool.write();
		let tx = test_transaction(&keychain, vec![50], vec![49]);
		match write_pool.add_to_pool(test_source(), tx.clone(), true, &BlockHeader::default()) {
			Err(PoolError::ImmatureCoinbase) => {}
			_ => panic!("Expected an immature coinbase error here."),
		}
	}
}