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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.hive.hplsql.objects;

import static org.apache.hive.hplsql.objects.MethodParams.Arity.BINARY;
import static org.apache.hive.hplsql.objects.MethodParams.Arity.UNARY;

import org.apache.hive.hplsql.File;
import org.apache.hive.hplsql.Var;
import org.apache.hive.hplsql.objects.MethodParams.Arity;

public class UtlFileClass implements HplClass {
  public static final UtlFileClass INSTANCE = new UtlFileClass();
  private final MethodDictionary methodDictionary = new MethodDictionary();

  private UtlFileClass() {
    methodDictionary.put("fopen", (self, args) -> {
      MethodParams params = new MethodParams("fopen", args, Arity.min(2));
      String dir = params.stringAt(0);
      String name = params.stringAt(1);
      boolean write = true;
      boolean overwrite = false;
      if (args.size() > 2) {
        String mode = params.stringAt(2);
        if (mode.equalsIgnoreCase("r")) {
          write = false;
        } else if (mode.equalsIgnoreCase("w")) {
          write = true;
          overwrite = true;
        }
      }
      File file = self.fileOpen(dir, name, write, overwrite);
      return new Var(Var.Type.FILE, file);
    });
    methodDictionary.put("get_line", (self, args) -> {
      MethodParams params = new MethodParams("get_line", args, UNARY);
      return new Var(self.getLine(params.fileAt(0)));
    });
    methodDictionary.put("put_line", (self, args) -> {
      MethodParams params = new MethodParams("put_line", args, BINARY);
      self.put(params.fileAt(0), params.stringAt(1), true);
      return null;
    });
    methodDictionary.put("put", (self, args) -> {
      MethodParams params = new MethodParams("put", args, BINARY);
      self.put(params.fileAt(0), params.stringAt(1), false);
      return null;
    });
    methodDictionary.put("fclose", (self, args) -> {
      File file = new MethodParams("fclose", args, UNARY).fileAt(0);
      self.fileClose(file);
      return null;
    });
  }

  @Override
  public UtlFile newInstance() {
    return new UtlFile(this);
  }

  @Override
  public MethodDictionary methodDictionary() {
    return methodDictionary;
  }
}