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#region Copyright notice and license

// Copyright 2018 gRPC authors.
//
// 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.

#endregion

using System.Collections.Generic;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace Grpc.Tools {
  public class ProtoReadDependencies : Task {
    /// <summary>
    /// The collection is used to collect possible additional dependencies
    /// of proto files cached under ProtoDepDir.
    /// </summary>
    [Required]
    public ITaskItem[] ProtoBuf { get; set; }

    /// <summary>
    /// Directory where protoc dependency files are cached.
    /// </summary>
    [Required]
    public string ProtoDepDir { get; set; }

    /// <summary>
    /// Additional items that a proto file depends on. This list may include
    /// extra dependencies; we do our best to include as few extra positives
    /// as reasonable to avoid missing any. The collection item is the
    /// dependency, and its Source metadatum is the dependent proto file, like
    ///     <ItemName Include="/usr/include/proto/wrapper.proto"
    ///               Source="my_proto.proto" />
    /// </summary>
    [Output]
    public ITaskItem[] Dependencies { get; private set; }

    public override bool Execute() {
      // Read dependency files, where available. There might be none,
      // just use a best effort.
      if (ProtoDepDir != null) {
       var dependencies = new List<ITaskItem>();
       foreach (var proto in ProtoBuf) {
          string[] deps = DepFileUtil.ReadDependencyInputs(ProtoDepDir, proto.ItemSpec, Log);
          foreach (string dep in deps) {
            var ti = new TaskItem(dep);
            ti.SetMetadata(Metadata.Source, proto.ItemSpec);
            dependencies.Add(ti);
          }
        }
        Dependencies = dependencies.ToArray();
      } else {
        Dependencies = new ITaskItem[0];
      }

      return !Log.HasLoggedErrors;
    }
  };
}