// Copyright (c) 2015, 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/error/error.dart' show AnalysisError;
import 'package:analyzer/src/generated/engine.dart'
    show InternalAnalysisContext;
import 'package:analyzer/src/plugin/task.dart';
import 'package:analyzer/src/task/api/model.dart';
import 'package:analyzer/src/task/dart.dart';
import 'package:analyzer/src/task/dart_work_manager.dart';
import 'package:analyzer/src/task/options_work_manager.dart';
import 'package:plugin/plugin.dart';

/**
 * A plugin that defines the extension points and extensions that are inherently
 * defined by the analysis engine.
 */
class EnginePlugin implements Plugin {
  /**
   * The simple identifier of the extension point that allows plugins to
   * register new analysis error results to compute for a Dart source.
   */
  static const String DART_ERRORS_FOR_SOURCE_EXTENSION_POINT =
      'dartErrorsForSource';

  /**
   * The simple identifier of the extension point that allows plugins to
   * register new analysis error results to compute for a Dart library
   * specific unit.
   */
  static const String DART_ERRORS_FOR_UNIT_EXTENSION_POINT =
      'dartErrorsForUnit';

  /**
   * The simple identifier of the extension point that allows plugins to
   * register new analysis error results to compute for an HTML source.
   */
  static const String HTML_ERRORS_EXTENSION_POINT = 'htmlErrors';

  /**
   * The simple identifier of the extension point that allows plugins to
   * register new work manager factories with the analysis engine.
   */
  static const String WORK_MANAGER_FACTORY_EXTENSION_POINT =
      'workManagerFactory';

  /**
   * The unique identifier of this plugin.
   */
  static const String UNIQUE_IDENTIFIER = 'analysis_engine.core';

  /**
   * The extension point that allows plugins to register new analysis error
   * results for a Dart source.
   */
  ExtensionPoint<ListResultDescriptor<AnalysisError>>
      dartErrorsForSourceExtensionPoint;

  /**
   * The extension point that allows plugins to register new analysis error
   * results for a Dart library specific unit.
   */
  ExtensionPoint<ListResultDescriptor<AnalysisError>>
      dartErrorsForUnitExtensionPoint;

  /**
   * The extension point that allows plugins to register new analysis error
   * results for an HTML source.
   */
  ExtensionPoint<ListResultDescriptor<AnalysisError>> htmlErrorsExtensionPoint;

  /**
   * The extension point that allows plugins to register new work manager
   * factories with the analysis engine.
   */
  ExtensionPoint<WorkManagerFactory> workManagerFactoryExtensionPoint;

  /**
   * Initialize a newly created plugin.
   */
  EnginePlugin();

  /**
   * Return a list containing all of the contributed analysis error result
   * descriptors for Dart sources.
   */
  @ExtensionPointId('DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID')
  List<ListResultDescriptor<AnalysisError>> get dartErrorsForSource =>
      dartErrorsForSourceExtensionPoint.extensions;

  /**
   * Return a list containing all of the contributed analysis error result
   * descriptors for Dart library specific units.
   */
  @ExtensionPointId('DART_ERRORS_FOR_UNIT_EXTENSION_POINT_ID')
  List<ListResultDescriptor<AnalysisError>> get dartErrorsForUnit =>
      dartErrorsForUnitExtensionPoint.extensions;

  /**
   * Return a list containing all of the contributed analysis error result
   * descriptors for HTML sources.
   */
  @ExtensionPointId('HTML_ERRORS_EXTENSION_POINT_ID')
  List<ListResultDescriptor<AnalysisError>> get htmlErrors =>
      htmlErrorsExtensionPoint.extensions;

  @override
  String get uniqueIdentifier => UNIQUE_IDENTIFIER;

  /**
   * Return a list containing all of the work manager factories that were
   * contributed.
   */
  List<WorkManagerFactory> get workManagerFactories =>
      workManagerFactoryExtensionPoint.extensions;

  @override
  void registerExtensionPoints(RegisterExtensionPoint registerExtensionPoint) {
    dartErrorsForSourceExtensionPoint =
        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
            this, DART_ERRORS_FOR_SOURCE_EXTENSION_POINT, null);
    registerExtensionPoint(dartErrorsForSourceExtensionPoint);
    dartErrorsForUnitExtensionPoint =
        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
            this, DART_ERRORS_FOR_UNIT_EXTENSION_POINT, null);
    registerExtensionPoint(dartErrorsForUnitExtensionPoint);
    htmlErrorsExtensionPoint =
        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
            this, HTML_ERRORS_EXTENSION_POINT, null);
    registerExtensionPoint(htmlErrorsExtensionPoint);
    workManagerFactoryExtensionPoint = new ExtensionPoint<WorkManagerFactory>(
        this, WORK_MANAGER_FACTORY_EXTENSION_POINT, null);
    registerExtensionPoint(workManagerFactoryExtensionPoint);
  }

  @override
  void registerExtensions(RegisterExtension registerExtension) {
    _registerWorkManagerFactoryExtensions(registerExtension);
    _registerDartErrorsForSource(registerExtension);
    _registerDartErrorsForUnit(registerExtension);
  }

  void _registerDartErrorsForSource(RegisterExtension registerExtension) {
    registerExtension(DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID, PARSE_ERRORS);
    registerExtension(DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID, SCAN_ERRORS);
  }

  void _registerDartErrorsForUnit(RegisterExtension registerExtension) {
    registerExtension(
        DART_ERRORS_FOR_UNIT_EXTENSION_POINT_ID, LIBRARY_UNIT_ERRORS);
  }

  void _registerWorkManagerFactoryExtensions(
      RegisterExtension registerExtension) {
    String taskId = WORK_MANAGER_EXTENSION_POINT_ID;
    registerExtension(taskId,
        (InternalAnalysisContext context) => new DartWorkManager(context));
    registerExtension(taskId,
        (InternalAnalysisContext context) => new OptionsWorkManager(context));
  }
}

/**
 * Annotation describing the relationship between a getter in [EnginePlugin]
 * and the associated identifier (in 'task.dart') which can be passed to the
 * extension manager to populate it.
 *
 * This annotation is not used at runtime; it is used to aid in static analysis
 * of the task model during development.
 */
class ExtensionPointId {
  final String extensionPointId;

  const ExtensionPointId(this.extensionPointId);
}