// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

// OpenEthereum 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 OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

use std::{
    str::{from_utf8, FromStr},
    sync::Arc,
};

use client::{
    traits::{
        BlockChainClient, BlockChainReset, BlockInfo, ChainInfo, ImportBlock, ImportExportBlocks,
    },
    Client, ClientConfig, ImportSealedBlock, PrepareOpenBlock,
};
use crypto::publickey::KeyPair;
use ethereum;
use ethereum_types::{Address, U256};
use executive::{Executive, TransactOptions};
use hash::keccak;
use io::IoChannel;
use miner::{Miner, MinerService, PendingOrdering};
use rustc_hex::ToHex;
use spec::Spec;
use state::{self, CleanupMode, State, StateInfo};
use tempdir::TempDir;
use test_helpers::{
    self, generate_dummy_client, generate_dummy_client_with_data, get_bad_state_dummy_block,
    get_good_dummy_block, get_good_dummy_block_seq, get_test_client_with_blocks,
    push_blocks_to_client,
};
use types::{
    data_format::DataFormat,
    filter::Filter,
    ids::BlockId,
    transaction::{Action, Condition, PendingTransaction, Transaction, TypedTransaction},
    view,
    views::BlockView,
};
use verification::queue::kind::blocks::Unverified;

#[test]
fn imports_from_empty() {
    let db = test_helpers::new_db();
    let spec = Spec::new_test();

    let client = Client::new(
        ClientConfig::default(),
        &spec,
        db,
        Arc::new(Miner::new_for_tests(&spec, None)),
        IoChannel::disconnected(),
    )
    .unwrap();
    client.import_verified_blocks();
    client.flush_queue();
}

#[test]
fn should_return_registrar() {
    let db = test_helpers::new_db();
    let tempdir = TempDir::new("").unwrap();
    let spec = ethereum::new_morden(&tempdir.path().to_owned());

    let client = Client::new(
        ClientConfig::default(),
        &spec,
        db,
        Arc::new(Miner::new_for_tests(&spec, None)),
        IoChannel::disconnected(),
    )
    .unwrap();
    let params = client.additional_params();
    let address = &params["registrar"];

    assert_eq!(address.len(), 40);
    assert!(U256::from_str(address).is_ok());
}

#[test]
fn imports_good_block() {
    let db = test_helpers::new_db();
    let spec = Spec::new_test();

    let client = Client::new(
        ClientConfig::default(),
        &spec,
        db,
        Arc::new(Miner::new_for_tests(&spec, None)),
        IoChannel::disconnected(),
    )
    .unwrap();
    let good_block = get_good_dummy_block();
    if client
        .import_block(Unverified::from_rlp(good_block, spec.params().eip1559_transition).unwrap())
        .is_err()
    {
        panic!("error importing block being good by definition");
    }
    client.flush_queue();
    client.import_verified_blocks();

    let block = client.block_header(BlockId::Number(1)).unwrap();
    assert!(!block.into_inner().is_empty());
}

#[test]
fn query_none_block() {
    let db = test_helpers::new_db();
    let spec = Spec::new_test();

    let client = Client::new(
        ClientConfig::default(),
        &spec,
        db,
        Arc::new(Miner::new_for_tests(&spec, None)),
        IoChannel::disconnected(),
    )
    .unwrap();
    let non_existant = client.block_header(BlockId::Number(188));
    assert!(non_existant.is_none());
}

#[test]
fn query_bad_block() {
    let client = get_test_client_with_blocks(vec![get_bad_state_dummy_block()]);
    let bad_block: Option<_> = client.block_header(BlockId::Number(1));

    assert!(bad_block.is_none());
}

#[test]
fn returns_chain_info() {
    let dummy_block = get_good_dummy_block();
    let client = get_test_client_with_blocks(vec![dummy_block.clone()]);
    let block = view!(BlockView, &dummy_block);
    let info = client.chain_info();
    assert_eq!(
        info.best_block_hash,
        block
            .header(client.engine().params().eip1559_transition)
            .hash()
    );
}

#[test]
fn returns_logs() {
    let dummy_block = get_good_dummy_block();
    let client = get_test_client_with_blocks(vec![dummy_block.clone()]);
    let logs = client
        .logs(Filter {
            from_block: BlockId::Earliest,
            to_block: BlockId::Latest,
            address: None,
            topics: vec![],
            limit: None,
        })
        .unwrap();
    assert_eq!(logs.len(), 0);
}

#[test]
fn returns_logs_with_limit() {
    let dummy_block = get_good_dummy_block();
    let client = get_test_client_with_blocks(vec![dummy_block.clone()]);
    let logs = client
        .logs(Filter {
            from_block: BlockId::Earliest,
            to_block: BlockId::Latest,
            address: None,
            topics: vec![],
            limit: None,
        })
        .unwrap();
    assert_eq!(logs.len(), 0);
}

#[test]
fn returns_block_body() {
    let dummy_block = get_good_dummy_block();
    let client = get_test_client_with_blocks(vec![dummy_block.clone()]);
    let block = view!(BlockView, &dummy_block);
    let body = client
        .block_body(BlockId::Hash(
            block
                .header(client.engine().params().eip1559_transition)
                .hash(),
        ))
        .unwrap();
    let body = body.rlp();
    assert_eq!(body.item_count().unwrap(), 2);
    assert_eq!(
        body.at(0).unwrap().as_raw()[..],
        block.rlp().at(1).as_raw()[..]
    );
    assert_eq!(
        body.at(1).unwrap().as_raw()[..],
        block.rlp().at(2).as_raw()[..]
    );
}

#[test]
fn imports_block_sequence() {
    let client = generate_dummy_client(6);
    let block = client.block_header(BlockId::Number(5)).unwrap();

    assert!(!block.into_inner().is_empty());
}

#[test]
fn can_collect_garbage() {
    let client = generate_dummy_client(100);
    client.tick(true);
    assert!(client.blockchain_cache_info().blocks < 100 * 1024);
}

#[test]
fn can_generate_gas_price_median() {
    let client = generate_dummy_client_with_data(3, 1, slice_into![1, 2, 3]);
    assert_eq!(Some(&U256::from(2)), client.gas_price_corpus(3).median());

    let client = generate_dummy_client_with_data(4, 1, slice_into![1, 4, 3, 2]);
    assert_eq!(Some(&U256::from(3)), client.gas_price_corpus(3).median());
}

#[test]
fn can_generate_gas_price_histogram() {
    let client = generate_dummy_client_with_data(
        20,
        1,
        slice_into![
            6354, 8593, 6065, 4842, 7845, 7002, 689, 4958, 4250, 6098, 5804, 4320, 643, 8895, 2296,
            8589, 7145, 2000, 2512, 1408
        ],
    );

    let hist = client.gas_price_corpus(20).histogram(5).unwrap();
    let correct_hist = ::stats::Histogram {
        bucket_bounds: vec_into![643, 2294, 3945, 5596, 7247, 8898],
        counts: vec![4, 2, 4, 6, 4],
    };
    assert_eq!(hist, correct_hist);
}

#[test]
fn empty_gas_price_histogram() {
    let client = generate_dummy_client_with_data(20, 0, slice_into![]);

    assert!(client.gas_price_corpus(20).histogram(5).is_none());
}

#[test]
fn corpus_is_sorted() {
    let client = generate_dummy_client_with_data(
        2,
        1,
        slice_into![
            U256::from_str("11426908979").unwrap(),
            U256::from_str("50426908979").unwrap()
        ],
    );
    let corpus = client.gas_price_corpus(20);
    assert!(corpus[0] < corpus[1]);
}

#[test]
fn can_handle_long_fork() {
    let client = generate_dummy_client(1200);
    for _ in 0..20 {
        client.import_verified_blocks();
    }
    assert_eq!(1200, client.chain_info().best_block_number);

    push_blocks_to_client(&client, 45, 1201, 800);
    push_blocks_to_client(&client, 49, 1201, 800);
    push_blocks_to_client(&client, 53, 1201, 600);

    for _ in 0..2300 {
        client.import_verified_blocks();
    }
    assert_eq!(2000, client.chain_info().best_block_number);
}

#[test]
fn can_mine() {
    let dummy_blocks = get_good_dummy_block_seq(2);
    let client = get_test_client_with_blocks(vec![dummy_blocks[0].clone()]);

    let b = client
        .prepare_open_block(
            Address::default(),
            (3141562.into(), 31415620.into()),
            vec![],
        )
        .unwrap()
        .close()
        .unwrap();

    assert_eq!(
        *b.header.parent_hash(),
        view!(BlockView, &dummy_blocks[0]).header_view().hash()
    );
}

#[test]
fn change_history_size() {
    let db = test_helpers::new_db();
    let test_spec = Spec::new_null();
    let mut config = ClientConfig::default();

    config.history = 2;
    let address = Address::random();
    {
        let client = Client::new(
            ClientConfig::default(),
            &test_spec,
            db.clone(),
            Arc::new(Miner::new_for_tests(&test_spec, None)),
            IoChannel::disconnected(),
        )
        .unwrap();

        for _ in 0..20 {
            let mut b = client
                .prepare_open_block(
                    Address::default(),
                    (3141562.into(), 31415620.into()),
                    vec![],
                )
                .unwrap();
            b.block_mut()
                .state_mut()
                .add_balance(&address, &5.into(), CleanupMode::NoEmpty)
                .unwrap();
            b.block_mut().state_mut().commit().unwrap();
            let b = b
                .close_and_lock()
                .unwrap()
                .seal(&*test_spec.engine, vec![])
                .unwrap();
            client.import_sealed_block(b).unwrap(); // account change is in the journal overlay
        }
    }
    let mut config = ClientConfig::default();
    config.history = 10;
    let client = Client::new(
        config,
        &test_spec,
        db,
        Arc::new(Miner::new_for_tests(&test_spec, None)),
        IoChannel::disconnected(),
    )
    .unwrap();
    assert_eq!(client.state().balance(&address).unwrap(), 100.into());
}

#[test]
fn does_not_propagate_delayed_transactions() {
    let key = KeyPair::from_secret(keccak("test").into()).unwrap();
    let secret = key.secret();
    let tx0 = PendingTransaction::new(
        TypedTransaction::Legacy(Transaction {
            nonce: 0.into(),
            gas_price: 0.into(),
            gas: 21000.into(),
            action: Action::Call(Address::default()),
            value: 0.into(),
            data: Vec::new(),
        })
        .sign(secret, None),
        Some(Condition::Number(2)),
    );
    let tx1 = PendingTransaction::new(
        TypedTransaction::Legacy(Transaction {
            nonce: 1.into(),
            gas_price: 0.into(),
            gas: 21000.into(),
            action: Action::Call(Address::default()),
            value: 0.into(),
            data: Vec::new(),
        })
        .sign(secret, None),
        None,
    );
    let client = generate_dummy_client(1);

    client
        .miner()
        .import_own_transaction(&*client, tx0)
        .unwrap();
    client
        .miner()
        .import_own_transaction(&*client, tx1)
        .unwrap();
    assert_eq!(0, client.transactions_to_propagate().len());
    assert_eq!(
        0,
        client
            .miner()
            .ready_transactions(&*client, 10, PendingOrdering::Priority)
            .len()
    );
    push_blocks_to_client(&client, 53, 2, 2);
    client.flush_queue();
    assert_eq!(2, client.transactions_to_propagate().len());
    assert_eq!(
        2,
        client
            .miner()
            .ready_transactions(&*client, 10, PendingOrdering::Priority)
            .len()
    );
}

#[test]
fn transaction_proof() {
    use client::ProvingBlockChainClient;

    let client = generate_dummy_client(0);
    let address = Address::random();
    let test_spec = Spec::new_test();
    for _ in 0..20 {
        let mut b = client
            .prepare_open_block(
                Address::default(),
                (3141562.into(), 31415620.into()),
                vec![],
            )
            .unwrap();
        b.block_mut()
            .state_mut()
            .add_balance(&address, &5.into(), CleanupMode::NoEmpty)
            .unwrap();
        b.block_mut().state_mut().commit().unwrap();
        let b = b
            .close_and_lock()
            .unwrap()
            .seal(&*test_spec.engine, vec![])
            .unwrap();
        client.import_sealed_block(b).unwrap(); // account change is in the journal overlay
    }

    let transaction = TypedTransaction::Legacy(Transaction {
        nonce: 0.into(),
        gas_price: 0.into(),
        gas: 21000.into(),
        action: Action::Call(Address::default()),
        value: 5.into(),
        data: Vec::new(),
    })
    .fake_sign(address);

    let proof = client
        .prove_transaction(transaction.clone(), BlockId::Latest)
        .unwrap()
        .1;
    let backend = state::backend::ProofCheck::new(&proof);

    let mut factories = ::factory::Factories::default();
    factories.accountdb = ::account_db::Factory::Plain; // raw state values, no mangled keys.
    let root = *client.best_block_header().state_root();

    let machine = test_spec.engine.machine();
    let env_info = client.latest_env_info();
    let schedule = machine.schedule(env_info.number);
    let mut state = State::from_existing(backend, root, 0.into(), factories.clone()).unwrap();
    Executive::new(&mut state, &env_info, &machine, &schedule)
        .transact(
            &transaction,
            TransactOptions::with_no_tracing().dont_check_nonce(),
        )
        .unwrap();

    assert_eq!(state.balance(&Address::default()).unwrap(), 5.into());
    assert_eq!(state.balance(&address).unwrap(), 95.into());
}

#[test]
fn reset_blockchain() {
    let client = get_test_client_with_blocks(get_good_dummy_block_seq(19));
    // 19 + genesis block
    assert!(client.block_header(BlockId::Number(20)).is_some());
    assert_eq!(
        client.block_header(BlockId::Number(20)).unwrap().hash(),
        client.best_block_header().hash()
    );

    assert!(client.reset(5).is_ok());

    client.chain().clear_cache();

    assert!(client.block_header(BlockId::Number(20)).is_none());
    assert!(client.block_header(BlockId::Number(19)).is_none());
    assert!(client.block_header(BlockId::Number(18)).is_none());
    assert!(client.block_header(BlockId::Number(17)).is_none());
    assert!(client.block_header(BlockId::Number(16)).is_none());

    assert!(client.block_header(BlockId::Number(15)).is_some());
}

#[test]
fn import_export_hex() {
    let client = get_test_client_with_blocks(get_good_dummy_block_seq(19));
    let block_rlps = (15..20)
        .filter_map(|num| client.block(BlockId::Number(num)))
        .map(|header| header.raw().to_hex())
        .collect::<Vec<_>>();

    let mut out = Vec::new();

    client
        .export_blocks(
            Box::new(&mut out),
            BlockId::Number(15),
            BlockId::Number(20),
            Some(DataFormat::Hex),
        )
        .unwrap();

    let written = from_utf8(&out)
        .unwrap()
        .split("\n")
        // last line is empty, ignore it.
        .take(5)
        .collect::<Vec<_>>();
    assert_eq!(block_rlps, written);

    assert!(client.reset(5).is_ok());
    client.chain().clear_cache();

    assert!(client.block_header(BlockId::Number(20)).is_none());
    assert!(client.block_header(BlockId::Number(19)).is_none());
    assert!(client.block_header(BlockId::Number(18)).is_none());
    assert!(client.block_header(BlockId::Number(17)).is_none());
    assert!(client.block_header(BlockId::Number(16)).is_none());

    client
        .import_blocks(Box::new(&*out), Some(DataFormat::Hex))
        .unwrap();

    assert!(client.block_header(BlockId::Number(20)).is_some());
    assert!(client.block_header(BlockId::Number(19)).is_some());
    assert!(client.block_header(BlockId::Number(18)).is_some());
    assert!(client.block_header(BlockId::Number(17)).is_some());
    assert!(client.block_header(BlockId::Number(16)).is_some());
}

#[test]
fn import_export_binary() {
    let client = get_test_client_with_blocks(get_good_dummy_block_seq(19));

    let mut out = Vec::new();

    client
        .export_blocks(
            Box::new(&mut out),
            BlockId::Number(15),
            BlockId::Number(20),
            Some(DataFormat::Binary),
        )
        .unwrap();

    assert!(client.reset(5).is_ok());
    client.chain().clear_cache();

    assert!(client.block_header(BlockId::Number(20)).is_none());
    assert!(client.block_header(BlockId::Number(19)).is_none());
    assert!(client.block_header(BlockId::Number(18)).is_none());
    assert!(client.block_header(BlockId::Number(17)).is_none());
    assert!(client.block_header(BlockId::Number(16)).is_none());

    client
        .import_blocks(Box::new(&*out), Some(DataFormat::Binary))
        .unwrap();

    assert!(client.block_header(BlockId::Number(19)).is_some());
    assert!(client.block_header(BlockId::Number(18)).is_some());
    assert!(client.block_header(BlockId::Number(20)).is_some());
    assert!(client.block_header(BlockId::Number(17)).is_some());
    assert!(client.block_header(BlockId::Number(16)).is_some());
}

#[test]
fn returns_state_root_basic() {
    let client = generate_dummy_client(6);
    let test_spec = Spec::new_test();
    let genesis_header = test_spec.genesis_header();

    assert!(client.state_data(genesis_header.state_root()).is_some());
}