/**
 * 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.avro.tool;

import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;

import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;

import org.apache.avro.Schema;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.trevni.avro.RandomData;

/** Creates a file filled with randomly-generated instances of a schema. */
public class CreateRandomFileTool implements Tool {

  @Override
  public String getName() {
    return "random";
  }

  @Override
  public String getShortDescription() {
    return "Creates a file with randomly generated instances of a schema.";
  }

  @Override
  public int run(InputStream stdin, PrintStream out, PrintStream err,
      List<String> args) throws Exception {

    OptionParser p = new OptionParser();
    OptionSpec<Integer> count =
      p.accepts("count", "Record Count")
      .withRequiredArg()
      .ofType(Integer.class);
    OptionSpec<String> codec = Util.compressionCodecOption(p);
    OptionSpec<Integer> level = Util.compressionLevelOption(p);
    OptionSpec<String> file =
        p.accepts("schema-file", "Schema File")
        .withOptionalArg()
        .ofType(String.class);
    OptionSpec<String> inschema =
        p.accepts("schema", "Schema")
        .withOptionalArg()
        .ofType(String.class);
    OptionSet opts = p.parse(args.toArray(new String[0]));
    if (opts.nonOptionArguments().size() != 1) {
      err.println("Usage: outFile (filename or '-' for stdout)");
      p.printHelpOn(err);
      return 1;
    }
    args = (List<String>)opts.nonOptionArguments();

    String schemastr = inschema.value(opts);
    String schemafile = file.value(opts);
    if (schemastr == null && schemafile == null) {
        err.println("Need input schema (--schema-file) or (--schema)");
        p.printHelpOn(err);
        return 1;
    }
    Schema schema = (schemafile != null)
        ? Util.parseSchemaFromFS(schemafile)
        : new Schema.Parser().parse(schemastr);

    DataFileWriter<Object> writer =
      new DataFileWriter<Object>(new GenericDatumWriter<Object>());
    writer.setCodec(Util.codecFactory(opts, codec, level));
    writer.create(schema, Util.fileOrStdout(args.get(0), out));

    for (Object datum : new RandomData(schema, (int)count.value(opts)))
      writer.append(datum);

    writer.close();

    return 0;
  }

}
