/*
 * Copyright 1999-2011 Alibaba Group Holding Ltd.
 *
 * 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 com.alibaba.druid.mock;

import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
import java.sql.NClob;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLXML;
import java.util.Properties;

import com.alibaba.druid.mock.handler.MockExecuteHandler;
import com.alibaba.druid.mock.handler.MySqlMockExecuteHandlerImpl;

public class MockDriver implements Driver {

    private String                  prefix         = "jdbc:fake:";
    private String                  mockPrefix     = "jdbc:mock:";

    private MockExecuteHandler      executeHandler = new MySqlMockExecuteHandlerImpl();

    private final static MockDriver instance       = new MockDriver();

    static {
        registerDriver(instance);
    }

    public static boolean registerDriver(Driver driver) {
        try {
            DriverManager.registerDriver(driver);

            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;
    }

    public MockExecuteHandler getExecuteHandler() {
        return executeHandler;
    }

    public void setExecuteHandler(MockExecuteHandler executeHandler) {
        this.executeHandler = executeHandler;
    }

    @Override
    public Connection connect(String url, Properties info) throws SQLException {
        MockConnection conn = new MockConnection(this);

        if (url == null) {
            return conn;
        }

        if (url.startsWith(prefix)) {
            String catalog = url.substring(prefix.length());
            conn.setCatalog(catalog);

            return conn;
        }

        if (url.startsWith(mockPrefix)) {
            String catalog = url.substring(mockPrefix.length());
            conn.setCatalog(catalog);

            return conn;
        }

        return null;
    }

    @Override
    public boolean acceptsURL(String url) throws SQLException {
        return url.startsWith(prefix);
    }

    @Override
    public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) throws SQLException {
        return null;
    }

    @Override
    public int getMajorVersion() {
        return 0;
    }

    @Override
    public int getMinorVersion() {
        return 0;
    }

    @Override
    public boolean jdbcCompliant() {
        return true;
    }

    protected ResultSet executeQuery(MockStatement stmt, String sql) throws SQLException {
        if (this.executeHandler != null) {
            return this.executeHandler.executeQuery(stmt, sql);
        }
        
        MockResultSet rs = new MockResultSet(stmt);

        if ("SELECT 1".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { 1 });
        } else if ("SELECT NULL".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { null });
        } else if ("SELECT NOW()".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { new java.sql.Timestamp(System.currentTimeMillis()) });
        } else if ("SELECT value FROM _int_1000_".equalsIgnoreCase(sql)) {
            for (int i = 0; i < 1000; ++i) {
                rs.getRows().add(new Object[] { i });
            }
        }

        return rs;
    }

    protected ResultSet createResultSet(MockPreparedStatement stmt) {
        MockResultSet rs = new MockResultSet(stmt);

        String sql = stmt.getSql();

        if ("SELECT 1".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { 1 });
        } else if ("SELECT NOW()".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { new java.sql.Timestamp(System.currentTimeMillis()) });
        } else if ("SELECT ?".equalsIgnoreCase(sql)) {
            rs.getRows().add(new Object[] { stmt.getParameters().get(0) });
        }

        return rs;
    }

    protected Clob createClob(MockConnection conn) throws SQLException {
        return new MockClob();
    }

    protected Blob createBlob(MockConnection conn) throws SQLException {
        return new MockBlob();
    }

    protected NClob createNClob(MockConnection conn) throws SQLException {
        return new MockNClob();
    }

    protected SQLXML createSQLXML(MockConnection conn) throws SQLException {
        return new MockSQLXML();
    }
}