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Language Server Protocol implementation for Smithy

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/*
 * Copyright 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.amazon.smithy.lsp.ext;

import coursierapi.Dependency;
import coursierapi.Fetch;
import coursierapi.Repository;
import coursierapi.error.CoursierError;
import java.io.File;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.stream.Collectors;
import software.amazon.smithy.lsp.ext.model.MavenConfig;
import software.amazon.smithy.lsp.ext.model.MavenRepository;
import software.amazon.smithy.lsp.ext.model.SmithyBuildExtensions;


public final class DependencyDownloader {
  private final Fetch fetch;

  private DependencyDownloader(SmithyBuildExtensions extensions) throws ValidationException {
    fetch = Fetch.create();
    MavenConfig config = extensions.getMavenConfig();
    toRepositories(config).forEach(fetch::addRepositories);
    toDependencies(config).forEach(fetch::addDependencies);
  }

  private static List toRepositories(MavenConfig mavenConfig) {
    // TODO: We assume maven repos by default.
    return mavenConfig.getRepositories().stream()
            .map(MavenRepository::getUrl)
            .map(coursierapi.MavenRepository::of)
            .collect(Collectors.toList());
  }

  private static List toDependencies(MavenConfig mavenConfig) throws ValidationException {
    List lst = new LinkedList<>();

    for (String dep : mavenConfig.getDependencies()) {
      // TODO: we assume Maven by default
      String[] parts = dep.split(":");
      if (parts.length != 3) {
        throw new ValidationException(
            "Dependencies in smithy-build.json must have the following format: org:module:version");
      } else {
        String org = parts[0];
        String module = parts[1];
        String version = parts[2];

        lst.add(Dependency.of(org, module, version));
      }
    }

    return Collections.unmodifiableList(lst);
  }

  public static DependencyDownloader create(SmithyBuildExtensions extensions) throws ValidationException {
    return new DependencyDownloader(extensions);
  }

  public List download() throws CoursierError {
    return fetch.fetch();
  }
}