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/*
 * Copyright (c) 2022 Dash Core Group
 *
 * 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.
 */

package org.bitcoinj.coinjoin;

import com.google.common.collect.Lists;
import org.bitcoinj.core.Coin;
import org.bitcoinj.core.Context;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.core.TransactionInput;
import org.bitcoinj.core.TransactionOutput;
import org.bitcoinj.core.Utils;
import org.bitcoinj.script.Script;
import org.bitcoinj.script.ScriptPattern;
import org.bitcoinj.utils.Threading;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.concurrent.GuardedBy;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;

import static org.bitcoinj.coinjoin.CoinJoinConstants.COINJOIN_EXTRA;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_ALREADY_HAVE;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_DENOM;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_FEES;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_INVALID_INPUT;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_INVALID_SCRIPT;
import static org.bitcoinj.coinjoin.PoolMessage.ERR_SIZE_MISMATCH;
import static org.bitcoinj.coinjoin.PoolMessage.MSG_NOERR;
import static org.bitcoinj.coinjoin.PoolState.POOL_STATE_IDLE;

public class CoinJoinBaseSession {
    private final Logger log = LoggerFactory.getLogger(CoinJoinBaseSession.class);
    protected final Context context;

    protected final ReentrantLock lock = Threading.lock("coinjoin_base_session");
    @GuardedBy("lock")
    protected final ArrayList entries; // Masternode/clients entries

    protected final AtomicReference state = new AtomicReference<>(POOL_STATE_IDLE); // should be one of the POOL_STATE_XXX values
    protected final AtomicReference status = new AtomicReference<>(PoolStatus.WARMUP);
    protected final AtomicLong timeLastSuccessfulStep = new AtomicLong(0); // the time when last successful mixing step was performed
    protected final AtomicInteger sessionID = new AtomicInteger(0); // 0 if no mixing session is active

    @GuardedBy("lock")
    protected Transaction finalMutableTransaction; // the finalized transaction ready for signing

    protected void setNull() {
        // Both sides
        lock.lock();
        try {
            state.set(POOL_STATE_IDLE);
            sessionID.set(0);
            sessionDenom = 0;
            entries.clear();
            finalMutableTransaction.clearInputs();
            finalMutableTransaction.clearOutputs();
            timeLastSuccessfulStep.set(Utils.currentTimeSeconds());
        } finally {
            lock.unlock();
        }
    }

    interface CheckTxOutputs {
        ValidInOuts check(TransactionOutput txout);
    }

    protected ValidInOuts isValidInOuts(List vin, List vout) {

        HashSet