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/*
 * 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.paimon.spark.procedure;

import org.apache.paimon.catalog.Catalog;
import org.apache.paimon.catalog.Identifier;
import org.apache.paimon.migrate.Migrator;
import org.apache.paimon.spark.catalog.WithPaimonCatalog;
import org.apache.paimon.spark.utils.TableMigrationUtils;
import org.apache.paimon.utils.ParameterUtils;
import org.apache.paimon.utils.StringUtils;

import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.catalyst.util.MapData;
import org.apache.spark.sql.connector.catalog.TableCatalog;
import org.apache.spark.sql.types.DataTypes;
import org.apache.spark.sql.types.Metadata;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;

import java.util.HashMap;
import java.util.Map;

import static org.apache.spark.sql.types.DataTypes.BooleanType;
import static org.apache.spark.sql.types.DataTypes.IntegerType;
import static org.apache.spark.sql.types.DataTypes.StringType;

/**
 * Migrate table procedure. Usage:
 *
 * 
 *  CALL sys.migrate_table(source_type => 'hive', table => 'db.tbl', options => 'x1=y1,x2=y2')
 * 
 */
public class MigrateTableProcedure extends BaseProcedure {

    private static final String TMP_TBL_SUFFIX = "_paimon_";

    private static final ProcedureParameter[] PARAMETERS =
            new ProcedureParameter[] {
                ProcedureParameter.required("source_type", StringType),
                ProcedureParameter.required("table", StringType),
                ProcedureParameter.optional("options", StringType),
                ProcedureParameter.optional("delete_origin", BooleanType),
                ProcedureParameter.optional("target_table", StringType),
                ProcedureParameter.optional(
                        "options_map", DataTypes.createMapType(StringType, StringType)),
                ProcedureParameter.optional("parallelism", IntegerType),
            };

    private static final StructType OUTPUT_TYPE =
            new StructType(
                    new StructField[] {
                        new StructField("result", DataTypes.BooleanType, true, Metadata.empty())
                    });

    protected MigrateTableProcedure(TableCatalog tableCatalog) {
        super(tableCatalog);
    }

    @Override
    public ProcedureParameter[] parameters() {
        return PARAMETERS;
    }

    @Override
    public StructType outputType() {
        return OUTPUT_TYPE;
    }

    @Override
    public InternalRow[] call(InternalRow args) {
        String format = args.getString(0);
        String sourceTable = args.getString(1);
        String properties = args.isNullAt(2) ? null : args.getString(2);
        boolean deleteNeed = args.isNullAt(3) || args.getBoolean(3);
        String targetTable = args.isNullAt(4) ? null : args.getString(4);
        MapData mapData = args.isNullAt(5) ? null : args.getMap(5);
        Map optionMap = mapDataToHashMap(mapData);
        int parallelism =
                args.isNullAt(6) ? Runtime.getRuntime().availableProcessors() : args.getInt(6);

        Identifier sourceTableId = Identifier.fromString(sourceTable);
        Identifier tmpTableId =
                StringUtils.isEmpty(targetTable)
                        ? Identifier.fromString(sourceTable + TMP_TBL_SUFFIX)
                        : Identifier.fromString(targetTable);

        Catalog paimonCatalog = ((WithPaimonCatalog) tableCatalog()).paimonCatalog();

        Map options = ParameterUtils.parseCommaSeparatedKeyValues(properties);
        options.putAll(optionMap);

        try {
            Migrator migrator =
                    TableMigrationUtils.getImporter(
                            format,
                            paimonCatalog,
                            sourceTableId.getDatabaseName(),
                            sourceTableId.getObjectName(),
                            tmpTableId.getDatabaseName(),
                            tmpTableId.getObjectName(),
                            parallelism,
                            options);

            migrator.deleteOriginTable(deleteNeed);
            migrator.executeMigrate();
            if (StringUtils.isEmpty(targetTable)) {
                paimonCatalog.renameTable(tmpTableId, sourceTableId, false);
            }
        } catch (Exception e) {
            throw new RuntimeException("Call migrate_table error: " + e.getMessage(), e);
        }

        return new InternalRow[] {newInternalRow(true)};
    }

    public static Map mapDataToHashMap(MapData mapData) {
        HashMap map = new HashMap<>();
        if (mapData != null) {
            for (int index = 0; index < mapData.numElements(); index++) {
                map.put(
                        mapData.keyArray().getUTF8String(index).toString(),
                        mapData.valueArray().getUTF8String(index).toString());
            }
        }
        return map;
    }

    public static ProcedureBuilder builder() {
        return new BaseProcedure.Builder() {
            @Override
            public MigrateTableProcedure doBuild() {
                return new MigrateTableProcedure(tableCatalog());
            }
        };
    }

    @Override
    public String description() {
        return "MigrateTableProcedure";
    }
}