/*
 * Copyright 2004-2013 H2 Group. Multiple-Licensed under the H2 License,
 * Version 1.0, and under the Eclipse Public License, Version 1.0
 * (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.test.bench;

import java.math.BigDecimal;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Random;

/**
 * This test is similar to the TPC-A test of the Transaction Processing Council
 * (TPC). However, only one connection and one thread is used.
 * <p>
 * See also: http://www.tpc.org/tpca/spec/tpca_current.pdf
 */
public class BenchA implements Bench {

    private static final String FILLER = "abcdefghijklmnopqrstuvwxyz";
    private static final int DELTA = 10000;

    private Database database;

    private int branches;
    private int tellers;
    private int accounts;
    private int transactions;

    public void init(Database db, int size) throws SQLException {
        this.database = db;
        transactions = size * 30;

        int scale = 1;
        accounts = size * 50;
        tellers = Math.max(accounts / 10, 1);
        branches = Math.max(tellers / 10, 1);

        db.start(this, "Init");

        db.openConnection();

        db.dropTable("BRANCHES");
        db.dropTable("TELLERS");
        db.dropTable("ACCOUNTS");
        db.dropTable("HISTORY");

        String[] create = { "CREATE TABLE BRANCHES(BID INT NOT NULL PRIMARY KEY, BBALANCE DECIMAL(15,2), FILLER VARCHAR(88))",
                "CREATE TABLE TELLERS(TID INT NOT NULL PRIMARY KEY, BID INT, TBALANCE DECIMAL(15,2), FILLER VARCHAR(84))",
                "CREATE TABLE ACCOUNTS(AID INT NOT NULL PRIMARY KEY, BID INT, ABALANCE DECIMAL(15,2), FILLER VARCHAR(84))",
                "CREATE TABLE HISTORY(TID INT, BID INT, AID INT, DELTA DECIMAL(15,2), HTIME DATETIME, FILLER VARCHAR(40))" };

        for (String sql : create) {
            db.update(sql);
        }

        PreparedStatement prep;
        db.setAutoCommit(false);
        int commitEvery = 1000;
        prep = db.prepare("INSERT INTO BRANCHES(BID,BBALANCE,FILLER) VALUES(?,10000.00,'" + FILLER + "')");
        for (int i = 0; i < branches * scale; i++) {
            prep.setInt(1, i);
            db.update(prep, "insertBranches");
            if (i % commitEvery == 0) {
                db.commit();
            }
        }
        db.commit();
        prep = db.prepare("INSERT INTO TELLERS(TID,BID,TBALANCE,FILLER) VALUES(?,?,10000.00,'" + FILLER + "')");
        for (int i = 0; i < tellers * scale; i++) {
            prep.setInt(1, i);
            prep.setInt(2, i / tellers);
            db.update(prep, "insertTellers");
            if (i % commitEvery == 0) {
                db.commit();
            }
        }
        db.commit();
        int len = accounts * scale;
        prep = db.prepare("INSERT INTO ACCOUNTS(AID,BID,ABALANCE,FILLER) VALUES(?,?,10000.00,'" + FILLER + "')");
        for (int i = 0; i < len; i++) {
            prep.setInt(1, i);
            prep.setInt(2, i / accounts);
            db.update(prep, "insertAccounts");
            if (i % commitEvery == 0) {
                db.commit();
            }
        }
        db.commit();
        db.closeConnection();
        db.end();

//        db.start(this, "Open/Close");
//        db.openConnection();
//        db.closeConnection();
//        db.end();
    }

    public void runTest() throws SQLException {

        database.start(this, "Transactions");
        database.openConnection();
        processTransactions();
        database.closeConnection();
        database.end();

        database.openConnection();
        processTransactions();
        database.logMemory(this, "Memory Usage");
        database.closeConnection();

    }

    private void processTransactions() throws SQLException {
        Random random = database.getRandom();
        int branch = random.nextInt(branches);
        int teller = random.nextInt(tellers);

        PreparedStatement updateAccount = database.prepare(
                "UPDATE ACCOUNTS SET ABALANCE=ABALANCE+? WHERE AID=?");
        PreparedStatement selectBalance = database.prepare(
                "SELECT ABALANCE FROM ACCOUNTS WHERE AID=?");
        PreparedStatement updateTeller = database.prepare(
                "UPDATE TELLERS SET TBALANCE=TBALANCE+? WHERE TID=?");
        PreparedStatement updateBranch = database.prepare(
                "UPDATE BRANCHES SET BBALANCE=BBALANCE+? WHERE BID=?");
        PreparedStatement insertHistory = database.prepare(
                "INSERT INTO HISTORY(AID,TID,BID,DELTA,HTIME,FILLER) VALUES(?,?,?,?,?,?)");
        int accountsPerBranch = accounts / branches;
        database.setAutoCommit(false);

        for (int i = 0; i < transactions; i++) {
            int account;
            if (random.nextInt(100) < 85) {
                account = random.nextInt(accountsPerBranch) + branch * accountsPerBranch;
            } else {
                account = random.nextInt(accounts);
            }
            int max = BenchA.DELTA;
            // delta: -max .. +max

            BigDecimal delta = BigDecimal.valueOf(random.nextInt(max * 2) - max);
            long current = System.currentTimeMillis();

            updateAccount.setBigDecimal(1, delta);
            updateAccount.setInt(2, account);
            database.update(updateAccount, "updateAccount");

            updateTeller.setBigDecimal(1, delta);
            updateTeller.setInt(2, teller);
            database.update(updateTeller, "updateTeller");

            updateBranch.setBigDecimal(1, delta);
            updateBranch.setInt(2, branch);
            database.update(updateBranch, "updateBranch");

            selectBalance.setInt(1, account);
            database.queryReadResult(selectBalance);

            insertHistory.setInt(1, account);
            insertHistory.setInt(2, teller);
            insertHistory.setInt(3, branch);
            insertHistory.setBigDecimal(4, delta);
            // TODO convert: should be able to convert date to timestamp
            // (by using 0 for remaining fields)
            // insertHistory.setDate(5, new java.sql.Date(current));
            insertHistory.setTimestamp(5, new java.sql.Timestamp(current));
            insertHistory.setString(6, BenchA.FILLER);
            database.update(insertHistory, "insertHistory");

            database.commit();
        }
        updateAccount.close();
        selectBalance.close();
        updateTeller.close();
        updateBranch.close();
        insertHistory.close();
    }

    public String getName() {
        return "BenchA";
    }

}
