/*
 * Copyright (c) 2011, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation
//
package org.eclipse.persistence.jpa.tests.jpql.parser;

import org.eclipse.persistence.jpa.jpql.ExpressionTools;
import org.junit.Test;
import static org.eclipse.persistence.jpa.tests.jpql.parser.JPQLParserTester.*;

/**
 * Unit-tests for {@link org.eclipse.persistence.jpa.jpql.parser.FunctionExpression FunctionExpression}.
 *
 * @version 2.5
 * @since 2.4
 * @author Pascal Filion
 */
@SuppressWarnings("nls")
public abstract class AbstractFunctionExpressionTest extends JPQLParserTest {

    private int index;

    private JPQLQueryStringFormatter buildQueryStringFormatter_1() {
        return new JPQLQueryStringFormatter() {
            @Override
            public String format(String query) {
                return query.replace("(,)", "(, )");
            }
        };
    }

    private JPQLQueryStringFormatter buildQueryStringFormatter_2() {
        return new JPQLQueryStringFormatter() {
            @Override
            public String format(String query) {
                return query.replace(",)", ", )");
            }
        };
    }

    private JPQLQueryStringFormatter buildQueryStringFormatter_3(final String jpqlQuery) {
        return new JPQLQueryStringFormatter() {
            @Override
            public String format(String query) {
                return jpqlQuery;
            }
        };
    }

    private JPQLQueryStringFormatter buildQueryStringFormatter_4(final String jpqlQuery) {
        return new JPQLQueryStringFormatter() {
            @Override
            public String format(String query) {
                return jpqlQuery.replaceAll("=", " = ").replaceAll("\\s+", " ");
            }
        };
    }

    protected abstract String functionName(int index);

    protected abstract String identifier(int index);

    protected boolean isExpression_14_Bad() {
        return false;
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        index++;
    }

    @Override
    protected void setUpClass() throws Exception {
        super.setUpClass();
        index = -1;
    }

    @Test
    public void test_JPQLQuery_01() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('FUNCTION_NAME') FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + ") " +
                           "FROM Employee e";

        ExpressionTester selectStatement = selectStatement(
            select(function(identifier, functionName)),
            from("Employee", "e")
        );

        testQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_02() {

        String identifier = identifier(index);
        String variable = identifier.toLowerCase();
        String entityName = Character.toUpperCase(identifier.charAt(0)) + identifier.toLowerCase().substring(1);

        // SELECT FUNCTION FROM Employee FUNCTION
        String jpqlQuery = "SELECT " + variable + " FROM " + entityName + " " + variable;

        ExpressionTester selectStatement = selectStatement(
            select(variable(variable)),
            from(entityName, variable)
        );

        testQuery(jpqlQuery, selectStatement, buildQueryStringFormatter_3(jpqlQuery));
    }

    @Test
    public void test_JPQLQuery_03() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION( FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "( FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = false;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = false;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_04() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(, FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(, FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = false;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_05() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(,) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(,) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_06() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(, ) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(, ) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = true;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement, buildQueryStringFormatter_1());
    }

    @Test
    public void test_JPQLQuery_07() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(, e) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(, e) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName, variable("e"));
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = true;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_08() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(e) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(e) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName, variable("e"));
        function.hasComma = false;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_09() {

        String identifier = identifier(index);
        String functionName = ExpressionTools.EMPTY_STRING;

        // SELECT FUNCTION(e FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(e FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName, variable("e"));
        function.hasComma = false;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = false;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_10() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('functionName' FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + " FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = false;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = false;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_11() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('functionName', FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + ", FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = false;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_12() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('functionName',) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + ",) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = false;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_13() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('functionName', ) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + ", ) FROM Employee e";

        FunctionExpressionTester function = function(identifier, functionName);
        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = true;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement, buildQueryStringFormatter_2());
    }

    @Test
    public void test_JPQLQuery_14() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        // SELECT FUNCTION('functionName', LENGTH(e.name)) FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName + ", LENGTH(e.name)) FROM Employee e";

        FunctionExpressionTester function = function(
            identifier,
            functionName,
            isExpression_14_Bad() ? bad(length(path("e.name"))) : length(path("e.name"))
        );

        function.hasComma = true;
        function.hasLeftParenthesis = true;
        function.hasRightParenthesis = true;
        function.hasSpaceAfterComma = true;

        ExpressionTester selectStatement = selectStatement(
            select(function),
            from("Employee", "e")
        );

        testInvalidQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_15() {

        String identifier = identifier(index);
        String functionName1 = functionName(index++);
        String functionName2 = functionName(index);

        // SELECT FUNCTION('functionName', e.firstName, 'NoFirstName'),
        //        FUNCTION('functionName', e.lastName, 'NoLastName')
        // FROM Employee e
        String jpqlQuery = "SELECT " + identifier + "(" + functionName1 + ", e.firstName, 'NoFirstName')," +
                           "       " + identifier + "(" + functionName2 + ", e.lastName,  'NoLastName' ) " +
                           "FROM Employee e";

        ExpressionTester selectStatement = selectStatement(
            select(
                function(identifier, functionName1, path("e.firstName"), string("'NoFirstName'")),
                function(identifier, functionName2, path("e.lastName"),  string("'NoLastName'"))
            ),
            from("Employee", "e")
        );

        testQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_16() {

        String identifier = identifier(index);
        String functionName = functionName(index);

        String jpqlQuery = "SELECT a " +
                           "FROM Asset a, Geography selectedGeography " +
                           "WHERE selectedGeography.id = :id AND " +
                           "      a.id IN :id_list AND " +
                           "      " + identifier + "(" + functionName + ", a.geometry, selectedGeography.geometry) = 'TRUE'";

        ExpressionTester selectStatement = selectStatement(
            select(variable("a")),
            from("Asset", "a", "Geography", "selectedGeography"),
            where(
                    path("selectedGeography.id").equal(inputParameter(":id"))
                .and(
                    path("a.id").in(":id_list")
                ).and(
                        function(identifier, functionName, path("a.geometry"), path("selectedGeography.geometry"))
                    .equal(
                        string("'TRUE'"))
                )
            )
        );

        testQuery(jpqlQuery, selectStatement);
    }

    @Test
    public void test_JPQLQuery_17() {

        String identifier = identifier(index);
        String functionName = functionName(index);
        String variable = identifier.toLowerCase();
        String entityName = Character.toUpperCase(identifier.charAt(0)) + identifier.toLowerCase().substring(1);

        // SELECT function FROM Function function
        // WHERE     function.function=FUNCTION('functionName')
        //       AND
        //           function=function
        // ORDER BY e.name
        String jpqlQuery = "SELECT " + variable + " " +
                           "FROM " + entityName + " " + variable + " " +
                           "WHERE " + variable + "." + variable + " = " + identifier + "(" + functionName + ") " +
                           "      AND" +
                           "      " + variable + "=" + variable + " " +
                           "ORDER BY e.name";

        ExpressionTester selectStatement = selectStatement(
            select(variable(variable)),
            from(entityName, variable),
            where(
                    path(variable + "." + variable).equal(function(identifier, functionName))
                .and(
                    variable(variable).equal(variable(variable))
                )
            ),
            orderBy(orderByItem("e.name"))
        );

        testQuery(jpqlQuery, selectStatement, buildQueryStringFormatter_4(jpqlQuery));
    }
}