/*
 * 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.hive.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.TableName;
import org.apache.phoenix.coprocessor.MetaDataProtocol.MetaDataMutationResult;
import org.apache.phoenix.hive.constants.PhoenixStorageHandlerConstants;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.schema.MetaDataClient;
import org.apache.phoenix.schema.PTable;
import org.apache.phoenix.schema.TableNotFoundException;
import org.apache.phoenix.util.ColumnInfo;
import org.apache.phoenix.util.PhoenixRuntime;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Misc utils
 */
public class PhoenixUtil {

    private static final Logger LOG = LoggerFactory.getLogger(PhoenixUtil.class);

    public static String getPhoenixType(String hiveTypeName) {
        if (hiveTypeName.startsWith("array")) {
            List<String> tokenList = new ArrayList<>(Arrays.asList(hiveTypeName.split("[<>]")));
            return getPhoenixType(tokenList.get(1)) + "[]";
        } else if (hiveTypeName.startsWith("int")) {
            return "integer";
        } else if (hiveTypeName.equals("string")) {
            return "varchar";
        } else {
            return hiveTypeName;
        }
    }

    public static boolean existTable(Connection conn, String tableName) throws SQLException {
        boolean exist = false;
        DatabaseMetaData dbMeta = conn.getMetaData();

        String[] schemaInfo = getTableSchema(tableName.toUpperCase());
        try (ResultSet rs = dbMeta.getTables(null, schemaInfo[0], schemaInfo[1], null)) {
            exist = rs.next();

            if (LOG.isDebugEnabled()) {
                if (exist) {
                    LOG.debug(rs.getString("TABLE_NAME") + " table exist. ");
                } else {
                    LOG.debug("table " + tableName + " doesn't exist.");
                }
            }
        }

        return exist;
    }

    public static List<String> getPrimaryKeyColumnList(Connection conn, String tableName) throws
            SQLException {
        Map<Short, String> primaryKeyColumnInfoMap = new HashMap<>();
        DatabaseMetaData dbMeta = conn.getMetaData();

        String[] schemaInfo = getTableSchema(tableName.toUpperCase());
        try (ResultSet rs = dbMeta.getPrimaryKeys(null, schemaInfo[0], schemaInfo[1])) {
            while (rs.next()) {
                primaryKeyColumnInfoMap.put(rs.getShort("KEY_SEQ"), rs.getString("COLUMN_NAME"));
            }

            if (LOG.isDebugEnabled()) {
                LOG.debug("PK-columns : " + primaryKeyColumnInfoMap);
            }
        }

        return new ArrayList<>(primaryKeyColumnInfoMap.values());
    }

    public static List<String> getPrimaryKeyColumnList(Configuration config, String tableName) {
        List<String> pkColumnNameList = null;

        try (Connection conn = PhoenixConnectionUtil.getInputConnection(config, new Properties())) {
            pkColumnNameList = getPrimaryKeyColumnList(conn, tableName);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }

        return pkColumnNameList;
    }

    public static void createTable(Connection conn, String createTableStatement) throws
            SQLException {
        conn.createStatement().execute(createTableStatement);
    }

    public static void dropTable(Connection conn, String tableName) throws SQLException {
        conn.createStatement().execute("drop table " + tableName);
    }

    public static List<ColumnInfo> getColumnInfoList(Connection conn, String tableName) throws
            SQLException {
        List<ColumnInfo> columnInfoList = null;

        try {
            columnInfoList = PhoenixRuntime.generateColumnInfo(conn, tableName, null);
        } catch (TableNotFoundException e) {
            // Exception can be occurred when table create.
            columnInfoList = Collections.emptyList();
        }

        return columnInfoList;
    }

    public static String[] getTableSchema(String tableName) {
        String[] schemaInfo = new String[2];
        String[] tokens = tableName.split("\\.");

        if (tokens.length == 2) {
            schemaInfo = tokens;
        } else {
            schemaInfo[1] = tokens[0];
        }

        return schemaInfo;
    }

    public static boolean isDisabledWal(MetaDataClient metaDataClient, String tableName) throws
            SQLException {
        String[] schemaInfo = getTableSchema(tableName.toUpperCase());
        MetaDataMutationResult result = metaDataClient.updateCache(schemaInfo[0], schemaInfo[1]);
        PTable dataTable = result.getTable();

        return dataTable.isWALDisabled();
    }

    public static void alterTableForWalDisable(Connection conn, String tableName, boolean
            disableMode) throws SQLException {
        conn.createStatement().execute("alter table " + tableName + " set disable_wal=" +
                disableMode);
    }

    public static void flush(Connection conn, String tableName) throws SQLException {
        try (Admin admin = ((PhoenixConnection) conn).getQueryServices().getAdmin()) {
            admin.flush(TableName.valueOf(tableName));
        } catch (IOException e) {
            throw new SQLException(e);
        }
    }

    public static String constructDeleteStatement(Connection conn, String tableName) throws
            SQLException {
        StringBuilder deleteQuery = new StringBuilder("delete from ").append(tableName).append(" " +
                "where ");

        List<String> primaryKeyColumnList = getPrimaryKeyColumnList(conn, tableName);
        for (int i = 0, limit = primaryKeyColumnList.size(); i < limit; i++) {
            String pkColumn = primaryKeyColumnList.get(i);
            deleteQuery.append(pkColumn).append(PhoenixStorageHandlerConstants.EQUAL).append
                    (PhoenixStorageHandlerConstants.QUESTION);

            if ((i + 1) != primaryKeyColumnList.size()) {
                deleteQuery.append(" and ");
            }
        }

        return deleteQuery.toString();
    }

    public static void closeResource(Statement stmt) throws SQLException {
        if (stmt != null && !stmt.isClosed()) {
            stmt.close();
        }
    }

    public static void closeResource(Connection conn) throws SQLException {
        if (conn != null && !conn.isClosed()) {
            conn.close();
        }
    }
}