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/*
 * Copyright (C) 2014-2023 Objectos Software LTDA.
 *
 * Licensed 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 objectos.code.internal;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import objectos.code.JavaTemplate;

public class JavaSinkOfDirectory extends JavaSinkOfStringBuilder {

  private static final OpenOption[] DEFAULT = {StandardOpenOption.CREATE_NEW};

  private static final OpenOption[] OVERWRITE = {
      StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING};

  private final Path directory;

  private Path file;

  boolean overwriteExising;

  boolean skipExising;

  public JavaSinkOfDirectory(Path directory) {
    super(new StringBuilder());

    this.directory = directory;
  }

  @Override
  public final void write(JavaTemplate template) throws IOException {
    eval(template);

    if (skipExising && Files.exists(file)) {
      return;
    }

    var parent = file.getParent();

    Files.createDirectories(parent);

    var options = DEFAULT;

    if (overwriteExising) {
      options = OVERWRITE;
    }

    Files.writeString(file, toString(), StandardCharsets.UTF_8, options);
  }

  @Override
  protected void writeCompilationUnitEnd(String packageName, String fileName) {
    super.writeCompilationUnitEnd(packageName, fileName);

    var packageDirectory = resolve(packageName, directory);

    file = packageDirectory.resolve(fileName);
  }

  private Path resolve(String name, Path path) {
    var result = path;

    var beginIndex = 0;

    var endIndex = name.indexOf('.', beginIndex);

    while (endIndex > 0) {
      var part = name.substring(beginIndex, endIndex);

      result = result.resolve(part);

      beginIndex = endIndex + 1;

      endIndex = name.indexOf('.', beginIndex);
    }

    endIndex = name.length();

    if (beginIndex < endIndex) {
      var part = name.substring(beginIndex, endIndex);

      result = result.resolve(part);
    }

    return result;
  }

}