// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analyzer/dart/analysis/analysis_context.dart';
import 'package:analyzer/dart/analysis/context_root.dart';
import 'package:analyzer/dart/analysis/session.dart';
import 'package:analyzer/file_system/file_system.dart';
import 'package:analyzer/src/context/builder.dart';
import 'package:analyzer/src/dart/analysis/driver.dart' show AnalysisDriver;
import 'package:analyzer/src/dart/sdk/sdk.dart';
import 'package:analyzer/src/generated/engine.dart' show AnalysisOptions;
import 'package:analyzer/src/workspace/workspace.dart';

/// An analysis context whose implementation is based on an analysis driver.
class DriverBasedAnalysisContext implements AnalysisContext {
  /// The resource provider used to access the file system.
  final ResourceProvider /*!*/ resourceProvider;

  @override
  final ContextRoot contextRoot;

  /// The driver on which this context is based.
  final AnalysisDriver driver;

  /// The [Workspace] for this context, `null` if not yet created.
  Workspace? _workspace;

  /// Initialize a newly created context that uses the given [resourceProvider]
  /// to access the file system and that is based on the given analysis
  /// [driver].
  DriverBasedAnalysisContext(
      this.resourceProvider, this.contextRoot, this.driver,
      {Workspace? workspace})
      : _workspace = workspace {
    driver.analysisContext = this;
  }

  @override
  AnalysisOptions get analysisOptions => driver.analysisOptions;

  @override
  AnalysisSession get currentSession => driver.currentSession;

  @override
  Folder? get sdkRoot {
    var sdk = driver.sourceFactory.dartSdk;
    if (sdk is FolderBasedDartSdk) {
      return sdk.directory;
    }
    return null;
  }

  @override
  Workspace get workspace {
    return _workspace ??= _buildWorkspace();
  }

  Workspace _buildWorkspace() {
    var path = contextRoot.root.path;
    return ContextBuilder.createWorkspace(
      resourceProvider: resourceProvider,
      options: ContextBuilderOptions(),
      rootPath: path,
    );
  }
}