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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 com.netease.arctic.spark.source;

import com.netease.arctic.spark.util.ArcticSparkUtils;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.Lists;
import org.apache.spark.sql.SparkSession;
import org.apache.spark.sql.connector.catalog.Identifier;
import org.apache.spark.sql.connector.catalog.SupportsCatalogOptions;
import org.apache.spark.sql.connector.catalog.Table;
import org.apache.spark.sql.connector.expressions.Transform;
import org.apache.spark.sql.sources.DataSourceRegister;
import org.apache.spark.sql.types.StructType;
import org.apache.spark.sql.util.CaseInsensitiveStringMap;

import java.util.List;
import java.util.Map;

public class ArcticSource implements DataSourceRegister, SupportsCatalogOptions {
  @Override
  public String shortName() {
    return "arctic";
  }

  @Override
  public Identifier extractIdentifier(CaseInsensitiveStringMap options) {
    return catalogAndIdentifier(options).identifier();
  }

  @Override
  public String extractCatalog(CaseInsensitiveStringMap options) {
    return catalogAndIdentifier(options).catalog().name();
  }

  @Override
  public StructType inferSchema(CaseInsensitiveStringMap options) {
    return null;
  }

  @Override
  public Table getTable(
      StructType schema, Transform[] partitioning, Map properties) {
    return null;
  }

  private static ArcticSparkUtils.TableCatalogAndIdentifier catalogAndIdentifier(CaseInsensitiveStringMap options) {
    Preconditions.checkArgument(
        options.containsKey("path"),
        "Cannot open table: path is not set");
    String path = options.get("path");
    Preconditions.checkArgument(!path.contains("/"),
        "invalid table identifier %s, contain '/'", path);
    List nameParts = Lists.newArrayList(path.split("\\."));
    SparkSession spark = SparkSession.active();

    return ArcticSparkUtils.tableCatalogAndIdentifier(spark, nameParts);
  }
}