/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.phoenix.compile;

import static org.apache.phoenix.util.TestUtil.TEST_PROPERTIES;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import org.apache.phoenix.exception.SQLExceptionCode;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.query.BaseConnectionlessQueryTest;
import org.apache.phoenix.schema.PTable;
import org.apache.phoenix.schema.PTable.ViewType;
import org.apache.phoenix.schema.PTableKey;
import org.apache.phoenix.util.PropertiesUtil;
import org.junit.Ignore;
import org.junit.Test;

public class ViewCompilerTest extends BaseConnectionlessQueryTest {
  @Test
  @Ignore("PHOENIX-4555 should mark these views as ViewType.READONLY")
  public void testViewTypeCalculation() throws Exception {
    assertViewType(new String[] { "V1", "V2", "V3", "V4" },
      new String[] { "CREATE VIEW v1 AS SELECT * FROM t WHERE k1 = 1 AND k2 = 'foo'",
        "CREATE VIEW v2 AS SELECT * FROM t WHERE k2 = 'foo'",
        "CREATE VIEW v3 AS SELECT * FROM t WHERE v = 'bar'||'bas'",
        "CREATE VIEW v4 AS SELECT * FROM t WHERE 'bar'=v and 5+3/2 = k1", },
      ViewType.UPDATABLE);
    assertViewType(new String[] { "V1", "V2", "V3", "V4" },
      new String[] { "CREATE VIEW v1 AS SELECT * FROM t WHERE k1 < 1 AND k2 = 'foo'",
        "CREATE VIEW v2 AS SELECT * FROM t WHERE substr(k2,0,3) = 'foo'",
        "CREATE VIEW v3 AS SELECT * FROM t WHERE v = TO_CHAR(CURRENT_DATE())",
        "CREATE VIEW v4 AS SELECT * FROM t WHERE 'bar'=v or 3 = k1", },
      ViewType.READ_ONLY);
  }

  public void assertViewType(String[] viewNames, String[] viewDDLs, ViewType viewType)
    throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    PhoenixConnection conn =
      DriverManager.getConnection(getUrl(), props).unwrap(PhoenixConnection.class);
    String ct =
      "CREATE TABLE t (k1 INTEGER NOT NULL, k2 VARCHAR, v VARCHAR, CONSTRAINT pk PRIMARY KEY (k1,k2))";
    conn.createStatement().execute(ct);

    for (String viewDDL : viewDDLs) {
      conn.createStatement().execute(viewDDL);
    }

    StringBuilder buf = new StringBuilder();
    int count = 0;
    for (String view : viewNames) {
      PTable table = conn.getTable(new PTableKey(null, view));
      assertEquals(viewType, table.getViewType());
      conn.createStatement().execute("DROP VIEW " + table.getName().getString());
      buf.append(' ');
      buf.append(table.getName().getString());
      count++;
    }
    assertEquals("Expected " + viewDDLs.length + ", but got " + count + ":" + buf.toString(),
      viewDDLs.length, count);
  }

  @Test
  @Ignore("PHOENIX-4555 should mark these views as ViewType.READONLY")
  public void testViewInvalidation() throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    PhoenixConnection conn =
      DriverManager.getConnection(getUrl(), props).unwrap(PhoenixConnection.class);
    String ct =
      "CREATE TABLE s1.t (k1 INTEGER NOT NULL, k2 VARCHAR, v VARCHAR, CONSTRAINT pk PRIMARY KEY (k1,k2))";
    conn.createStatement().execute(ct);
    conn.createStatement().execute("CREATE VIEW s2.v3 AS SELECT * FROM s1.t WHERE v = 'bar'");

    try {
      conn.createStatement().execute("ALTER VIEW s2.v3 DROP COLUMN v");
      fail();
    } catch (SQLException e) {
      assertEquals(SQLExceptionCode.CANNOT_DROP_VIEW_REFERENCED_COL.getErrorCode(),
        e.getErrorCode());
    }

    // No error, as v still exists
    conn.createStatement().executeQuery("SELECT v FROM s2.v3");
    conn.createStatement().execute("CREATE VIEW s2.v4 AS SELECT * FROM s1.t WHERE v = 'bas'");

    // Can drop view
    conn.createStatement().execute("DROP VIEW s2.v3");
  }

  @Test
  public void testInvalidUpsertSelect() throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    PhoenixConnection conn =
      DriverManager.getConnection(getUrl(), props).unwrap(PhoenixConnection.class);
    conn.createStatement().execute(
      "CREATE TABLE t1 (k1 INTEGER NOT NULL, k2 VARCHAR, v VARCHAR, CONSTRAINT pk PRIMARY KEY (k1,k2))");
    conn.createStatement()
      .execute("CREATE TABLE t2 (k3 INTEGER NOT NULL, v VARCHAR, CONSTRAINT pk PRIMARY KEY (k3))");
    conn.createStatement().execute("CREATE VIEW v1 AS SELECT * FROM t1 WHERE k1 = 1");

    try {
      conn.createStatement().executeUpdate("UPSERT INTO v1 SELECT k3,'foo',v FROM t2");
      fail();
    } catch (SQLException e) {
      assertEquals(SQLExceptionCode.CANNOT_UPDATE_VIEW_COLUMN.getErrorCode(), e.getErrorCode());
    }
  }
}
