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package org.hsqldb.test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Enumeration;

import junit.framework.TestCase;
import junit.framework.TestResult;

/**
 * Test merge statements via jdbc against in-memory database
 * @author Justin Spadea
 */
public class TestMerge extends TestBase {

    Statement         stmnt;
    PreparedStatement pstmnt;
    Connection        connection;

    public TestMerge(String name) {
        super(name);
    }

    protected void setUp() throws Exception {

        super.setUp();

        try {
            connection = newConnection();
            stmnt      = connection.createStatement();
        } catch (Exception e) {}
    }

    /**
     * Prints a table displaying specified columns, and checks the expected
     * number of rows.
     */
    public static void printTable(Statement statement, String table,
                            String cols, int expected) throws SQLException {

        int               rows = 0;
        ResultSet rs = statement.executeQuery("SELECT " + cols + " FROM " + table);
        ResultSetMetaData rsmd = rs.getMetaData();
        String result = "Table " + table + ", expecting " + expected
                        + " rows total:\n";

        while (rs.next()) {
            for (int i = 0; i < rsmd.getColumnCount(); i++) {
                result += rsmd.getColumnLabel(i + 1) + ":"
                          + rs.getString(i + 1) + ":";
            }

            result += "\n";

            rows++;
        }

        rs.close();
        System.out.println(result);
        assertEquals(expected, rows);
    }

    /**
     * Sets up tables T and S and executes MERGE query on them
     * @param sql
     * @throws SQLException
     */
    private void executeMerge(String merge) throws SQLException {

        // create table T and insert some preliminary data
        stmnt.execute("DROP SCHEMA SA IF EXISTS CASCADE;");
        stmnt.execute("CREATE SCHEMA SA AUTHORIZATION SA");
        stmnt.execute("DROP TABLE SA.T IF EXISTS;");
        stmnt.execute(
            "CREATE TABLE SA.T (I IDENTITY, A CHAR(10), B CHAR(10));");
        stmnt.execute("INSERT INTO SA.T VALUES ((0, 'A', 'a'),"
                      + "(1, 'B', 'b'), (4, 'C', 'c'));");

        // create table S and insert some preliminary data
        stmnt.execute("DROP TABLE SA.S IF EXISTS;");
        stmnt.execute(
            "CREATE TABLE SA.S (I IDENTITY, A CHAR(10), B CHAR(10), C CHAR(10));");
        stmnt.execute(
            "INSERT INTO SA.S VALUES ((0, 'D', 'd', 'Dd'),"
            + "(2, 'E', 'e', 'Ee'), (3, 'F', 'f', 'Ff'), (4, 'G', 'g', 'Gg'));");
        printTable(stmnt, "SA.T", "*", 3);
        printTable(stmnt, "SA.S", "*", 4);
        stmnt.execute(merge);
    }

    public void testMerge1() {

        try {

            // merge statement with table aliases, using both match statements
            executeMerge(
                "MERGE INTO SA.T X " +
                "USING SA.S AS Y " +
                "ON X.I = Y.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET X.A = Y.A, X.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT (I, A, B) VALUES (Y.I, Y.A, 'INSERTED');"
            );

            // table t should now have 5 rows, first and fifth with A/B updated
            // to values A/C from S, second should be the same, and third and
            // fourth should be the inserted rows that didn't exist before.
            printTable(stmnt, "SA.T", "*", 5);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge1 complete\n");
    }

    public void testMerge2() {

        try {

            // merge statement with only update statement
            executeMerge(
                "MERGE INTO SA.T " +
                "USING SA.S " +
                "ON T.I = S.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = S.A, T.B = 'UPDATED';"
            );

            // two rows should be updated, nothing inserted
            printTable(stmnt, "SA.T", "*", 3);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge2 complete\n");
    }

    public void testMerge3() {

        try {

            // merge statement with only insert statement, without
            // specifying insert columns
            executeMerge(
                "MERGE INTO SA.T " +
                "USING SA.S " +
                "ON T.I = S.I " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (S.I, S.A, 'INSERTED');"
            );

            // two rows should be updated, nothing inserted
            printTable(stmnt, "SA.T", "*", 5);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge3 complete\n");
    }

    public void testMerge4() {

        try {

            // merge statement with both update and insert, without
            // specifying insert columns
            executeMerge(
                "MERGE INTO SA.T " +
                "USING SA.S " +
                "ON T.I = S.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = S.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (S.I, S.A, 'INSERTED');"
            );

            // two rows should be updated, two rows inserted
            printTable(stmnt, "SA.T", "*", 5);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge4 complete\n");
    }

    public void testMerge5() {

        try {

            // merge statement with select statement as source table, using all
            // columns from S
            executeMerge(
                "MERGE INTO SA.T " +
                "USING (SELECT * FROM SA.S) AS X " +
                "ON T.I = X.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = X.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (X.I, X.A, 'INSERTED');"
            );

            // two rows should be updated, two rows inserted
            printTable(stmnt, "SA.T", "*", 5);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge5 complete\n");
    }

    public void testMerge6() {

        try {

            // merge statement with select statement as source table, specifying
            // select columns from S
            executeMerge(
                "MERGE INTO SA.T " +
                "USING (SELECT I, A, C FROM SA.S) AS X " +
                "ON T.I = X.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = X.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (X.I, X.A, 'INSERTED');"
            );

            // two rows should be updated, two rows inserted
            printTable(stmnt, "SA.T", "*", 5);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge6 complete\n");
    }

    public void testMerge7() {

        try {

            // merge statement with select statement as source table, with WHERE
            // condition that matches a row in T
            executeMerge(
                "MERGE INTO SA.T " +
                "USING (SELECT * FROM SA.S WHERE I = 4) AS X " +
                "ON T.I = X.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = X.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (X.I, X.A, 'INSERTED');"
            );

            // 1 row should be updated
            printTable(stmnt, "SA.T", "*", 3);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge7 complete\n");
    }

    public void testMerge8() {

        try {

            // merge statement with select statement as source table, with WHERE
            // condition that does not match a row in T
            executeMerge(
                "MERGE INTO SA.T " +
                "USING (SELECT * FROM SA.S WHERE I = 3) AS X " +
                "ON T.I = X.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = X.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (X.I, X.A, 'INSERTED');"
            );

            // 1 row should be inserted
            printTable(stmnt, "SA.T", "*", 4);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge8 complete\n");
    }

    public void testMerge9() {

        try {

            // merge statement with select statement as source table, with WHERE
            // condition that does and does not not match a row in T
            executeMerge(
                "MERGE INTO SA.T " +
                "USING (SELECT * FROM SA.S WHERE I > 2) AS X " +
                "ON T.I = X.I " +
                "WHEN MATCHED THEN " +
                    "UPDATE SET T.A = X.A, T.B = 'UPDATED' " +
                "WHEN NOT MATCHED THEN " +
                    "INSERT VALUES (X.I, X.A, 'INSERTED');"
            );

            // 1 row should be inserted, 1 row updated
            printTable(stmnt, "SA.T", "*", 4);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge9 complete\n");
    }

    public void testMerge10() {

        try {

            // merge statement with values as source table, with WHERE
            // condition that does not not match a row in T
            executeMerge("MERGE INTO SA.T "
                         + "USING (VALUES(10, 'testA', 'testB')) AS X (I, A, B) "
                         + "ON T.I = X.I " + "WHEN MATCHED THEN "
                         + "UPDATE SET T.A = X.A, T.B = 'UPDATED' "
                         + "WHEN NOT MATCHED THEN "
                         + "INSERT VALUES (X.I, X.A, 'INSERTED');");

            // 1 row should be inserted
            printTable(stmnt, "SA.T", "*", 4);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge10 complete\n");
    }

    public void testMerge11() {

        try {
            executeMerge("SET SCHEMA PUBLIC");

            PreparedStatement ps = connection.prepareStatement(
        "MERGE INTO SA.T "
                         + "USING (VALUES(CAST(? AS INT), 'testA', 'testB')) AS X (I, A, B) "
                         + "ON T.I = X.I " + "WHEN MATCHED THEN "
                         + "UPDATE SET T.A = X.A, T.B = 'UPDATED' "
                         + "WHEN NOT MATCHED THEN "
                         + "INSERT VALUES (X.I, X.A, 'INSERTED');");

            ps.setInt(1, 10);
            ps.executeUpdate();

            // 1 row should be inserted
            printTable(stmnt, "SA.T", "*", 4);
        } catch (SQLException e) {
            fail(e.getMessage());
        }

        System.out.println("testMerge10 complete\n");
    }
    protected void tearDown() {

        try {
            stmnt.execute("DROP SCHEMA SA IF EXISTS CASCADE;");
            connection.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("TestSql.tearDown() error: " + e.getMessage());
        }

        super.tearDown();
    }

    public static void main(String[] argv) {

        TestResult result = new TestResult();
        TestCase   testA  = new TestMerge("testMerge1");
        TestCase   testB  = new TestMerge("testMerge2");
        TestCase   testC  = new TestMerge("testMerge3");
        TestCase   testD  = new TestMerge("testMerge4");
        TestCase   testE  = new TestMerge("testMerge5");
        TestCase   testF  = new TestMerge("testMerge6");
        TestCase   testG  = new TestMerge("testMerge7");
        TestCase   testH  = new TestMerge("testMerge8");
        TestCase   testI  = new TestMerge("testMerge9");
        TestCase   testJ  = new TestMerge("testMerge10");
        TestCase   testK  = new TestMerge("testMerge11");

        testA.run(result);
        testB.run(result);
        testC.run(result);
        testD.run(result);
        testE.run(result);
        testF.run(result);
        testG.run(result);
        testH.run(result);
        testI.run(result);
        testJ.run(result);
        testK.run(result);
        System.out.println("TestMerge error count: " + result.failureCount());

        Enumeration e = result.failures();

        while (e.hasMoreElements()) {
            System.out.println(e.nextElement());
        }
    }
}
