// Copyright (c) 2019, 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:analysis_server/protocol/protocol_generated.dart';
import 'package:analysis_server/src/analysis_server.dart';
import 'package:analyzer/dart/analysis/results.dart';
import 'package:analyzer/file_system/file_system.dart';
import 'package:analyzer/src/generated/source.dart';
import 'package:analyzer_plugin/protocol/protocol_common.dart'
    show Location, SourceChange, SourceEdit, SourceFileEdit;
import 'package:nnbd_migration/api_for_analysis_server/dartfix_listener_interface.dart';

/// Tasks use this API to report results.
class DartFixListener implements DartFixListenerInterface {
  @override
  final AnalysisServer server;

  final List<DartFixSuggestion> suggestions = <DartFixSuggestion>[];
  final List<DartFixSuggestion> otherSuggestions = <DartFixSuggestion>[];

  @override
  final SourceChange sourceChange = SourceChange('dartfix');

  /// The details to be returned to the client.
  List<String> details = [];

  DartFixListener(this.server);

  ResourceProvider get resourceProvider => server.resourceProvider;

  /// Add the given [detail] to the list of details to be returned to the
  /// client.
  @override
  void addDetail(String detail) {
    if (details.length < 200) {
      details.add(detail);
    }
  }

  /// Record an edit to be sent to the client.
  ///
  /// The associated suggestion should be separately added by calling
  /// [addSuggestion].
  @override
  void addEditWithoutSuggestion(Source source, SourceEdit edit) {
    sourceChange.addEdit(source.fullName, -1, edit);
  }

  /// Record a recommendation to be sent to the client.
  @override
  void addRecommendation(String description, [Location location]) {
    otherSuggestions.add(DartFixSuggestion(description, location: location));
  }

  /// Record a source change to be sent to the client.
  void addSourceChange(
      String description, Location location, SourceChange change) {
    suggestions.add(DartFixSuggestion(description, location: location));
    for (var fileEdit in change.edits) {
      for (var sourceEdit in fileEdit.edits) {
        sourceChange.addEdit(fileEdit.file, fileEdit.fileStamp, sourceEdit);
      }
    }
  }

  /// Record edits for a single source to be sent to the client.
  void addSourceEdits(String description, Location location, Source source,
      Iterable<SourceEdit> edits) {
    suggestions.add(DartFixSuggestion(description, location: location));
    for (var edit in edits) {
      sourceChange.addEdit(source.fullName, -1, edit);
    }
  }

  /// Record a source change to be sent to the client.
  @override
  void addSourceFileEdit(
      String description, Location location, SourceFileEdit fileEdit) {
    suggestions.add(DartFixSuggestion(description, location: location));
    for (var sourceEdit in fileEdit.edits) {
      sourceChange.addEdit(fileEdit.file, fileEdit.fileStamp, sourceEdit);
    }
  }

  /// Record a suggestion to be sent to the client.
  ///
  /// The associated edits should be separately added by calling
  /// [addEditWithoutRecommendation].
  @override
  void addSuggestion(String description, Location location) {
    suggestions.add(DartFixSuggestion(description, location: location));
  }

  /// Return the [Location] representing the specified offset and length
  /// in the given compilation unit.
  Location locationFor(ResolvedUnitResult result, int offset, int length) {
    final locInfo = result.unit.lineInfo.getLocation(offset);
    final location = Location(
        result.path, offset, length, locInfo.lineNumber, locInfo.columnNumber);
    return location;
  }

  /// Reset this listener so that it can accrue a new set of changes.
  void reset() {
    suggestions.clear();
    otherSuggestions.clear();
    sourceChange
      ..edits.clear()
      ..linkedEditGroups.clear()
      ..selection = null
      ..id = null;
  }
}