/*
    * 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.maven.cling.invoker.mvn;
  
  import java.io.IOException;
  import java.nio.charset.Charset;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Stream;
  
  import org.apache.commons.cli.ParseException;
  import org.apache.maven.api.cli.Options;
  import org.apache.maven.api.cli.mvn.MavenOptions;
  import org.apache.maven.cling.invoker.BaseParser;
  
  public class MavenParser extends BaseParser {
      @Override
      protected Options parseCliOptions(LocalContext context) {
          ArrayList<MavenOptions> result = new ArrayList<>();
          // CLI args
          MavenOptions cliOptions = parseMavenCliOptions(context.parserRequest.args());
          result.add(cliOptions);
          // atFile option
          if (cliOptions.atFile().isPresent()) {
              Path file = context.cwd.resolve(cliOptions.atFile().orElseThrow());
              if (Files.isRegularFile(file)) {
                  result.add(parseMavenAtFileOptions(file));
              } else {
                  throw new IllegalArgumentException("Specified file does not exists (" + file + ")");
              }
          }
          // maven.config; if exists
          Path mavenConfig = context.rootDirectory != null ? context.rootDirectory.resolve(".mvn/maven.config") : null;
          if (mavenConfig != null && Files.isRegularFile(mavenConfig)) {
              result.add(parseMavenConfigOptions(mavenConfig));
          }
          return LayeredMavenOptions.layerMavenOptions(result);
      }
  
      protected MavenOptions parseMavenCliOptions(List<String> args) {
          try {
              return parseArgs(Options.SOURCE_CLI, args);
          } catch (ParseException e) {
              throw new IllegalArgumentException("Failed to parse CLI arguments: " + e.getMessage(), e.getCause());
          }
      }
  
      protected MavenOptions parseMavenAtFileOptions(Path atFile) {
          try (Stream<String> lines = Files.lines(atFile, Charset.defaultCharset())) {
              List<String> args =
                      lines.filter(arg -> !arg.isEmpty() && !arg.startsWith("#")).toList();
              return parseArgs("atFile", args);
          } catch (ParseException e) {
              throw new IllegalArgumentException(
                      "Failed to parse arguments from file (" + atFile + "): " + e.getMessage(), e.getCause());
          } catch (IOException e) {
              throw new IllegalStateException("Error reading config file: " + atFile, e);
          }
      }
  
      protected MavenOptions parseMavenConfigOptions(Path configFile) {
          try (Stream<String> lines = Files.lines(configFile, Charset.defaultCharset())) {
              List<String> args =
                      lines.filter(arg -> !arg.isEmpty() && !arg.startsWith("#")).toList();
              MavenOptions options = parseArgs("maven.config", args);
              if (options.goals().isPresent()) {
                  // This file can only contain options, not args (goals or phases)
                  throw new IllegalArgumentException("Unrecognized entries in maven.config (" + configFile + ") file: "
                          + options.goals().get());
              }
              return options;
          } catch (ParseException e) {
              throw new IllegalArgumentException(
                      "Failed to parse arguments from maven.config file (" + configFile + "): " + e.getMessage(),
                      e.getCause());
          } catch (IOException e) {
              throw new IllegalStateException("Error reading config file: " + configFile, e);
          }
      }
  
      protected MavenOptions parseArgs(String source, List<String> args) throws ParseException {
         return CommonsCliMavenOptions.parse(source, args.toArray(new String[0]));
     }
 }