// Copyright (c) 2017, 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 'dart:async';

import 'package:analyzer/src/generated/source.dart';
import 'package:analyzer_plugin/protocol/protocol_common.dart';
import 'package:analyzer_plugin/src/utilities/change_builder/change_builder_core.dart';
import 'package:meta/meta.dart';

/**
 * A builder used to build a [SourceChange].
 *
 * Clients may not extend, implement or mix-in this class.
 */
abstract class ChangeBuilder {
  /**
   * Initialize a newly created change builder.
   */
  factory ChangeBuilder() = ChangeBuilderImpl;

  /**
   * Return the source change that was built. The source change will not be
   * complete until all of the futures returned by [addFileEdit] have completed.
   */
  SourceChange get sourceChange;

  /**
   * Use the [buildFileEdit] function to create a collection of edits to the
   * file with the given [path]. The edits will be added to the source change
   * that is being built. The [timeStamp] is the time at which the file was last
   * modified and is used by clients to ensure that it is safe to apply the
   * edits.
   */
  Future<Null> addFileEdit(
      String path, int timeStamp, void buildFileEdit(FileEditBuilder builder));

  /**
   * Set the selection for the change being built to the given [position].
   */
  void setSelection(Position position);
}

/**
 * A builder used to build a [SourceEdit] as part of a [SourceFileEdit].
 *
 * Clients may not extend, implement or mix-in this class.
 */
abstract class EditBuilder {
  /**
   * Add a region of text that is part of the linked edit group with the given
   * [groupName]. The [buildLinkedEdit] function is used to write the content of
   * the region of text and to add suggestions for other possible values for
   * that region.
   */
  void addLinkedEdit(
      String groupName, void buildLinkedEdit(LinkedEditBuilder builder));

  /**
   * Add the given text as a linked edit group with the given [groupName]. If
   * both a [kind] and a list of [suggestions] are provided, they will be added
   * as suggestions to the group with the given kind.
   *
   * Throws an [ArgumentError] if either [kind] or [suggestions] are provided
   * without the other.
   */
  void addSimpleLinkedEdit(String groupName, String text,
      {LinkedEditSuggestionKind kind, List<String> suggestions});

  /**
   * Set the selection to the given location within the edit being built.
   *
   * This method only works correctly if all of the edits that will applied to
   * text before the current edit have already been created. Those edits are
   * needed in order to convert the current offset (as of the time this method
   * is invoked) into an offset relative to the text resulting from applying all
   * of the edits.
   */
  void selectHere();

  /**
   * Add the given [string] to the content of the current edit.
   */
  void write(String string);

  /**
   * Add the given [string] to the content of the current edit and then add an
   * end-of-line marker.
   */
  void writeln([String string]);
}

/**
 * A builder used to build a [SourceFileEdit] within a [SourceChange].
 *
 * Clients may not extend, implement or mix-in this class.
 */
abstract class FileEditBuilder {
  /**
   * Add a deletion of text specified by the given [range]. The [range] is
   * relative to the original source. This is fully equivalent to
   *
   *     addSimpleReplacement(range, '');
   */
  void addDeletion(SourceRange range);

  /**
   * Add an insertion of text at the given [offset]. The [offset] is relative to
   * the original source. The [buildEdit] function is used to write the text to
   * be inserted. This is fully equivalent to
   *
   *     addReplacement(new SourceRange(offset, 0), buildEdit);
   */
  void addInsertion(int offset, void buildEdit(EditBuilder builder));

  /**
   * Add the region of text specified by the given [range] to the linked edit
   * group with the given [groupName]. The [range] is relative to the original
   * source. This is typically used to include pre-existing regions of text in a
   * group. If the region to be included is part of newly generated text, then
   * the method [EditBuilder.addLinkedEdit] should be used instead.
   *
   * This method only works correctly if all of the edits that will applied to
   * text before the given range have already been created. Those edits are
   * needed in order to convert the range into a range relative to the text
   * resulting from applying all of the edits.
   */
  void addLinkedPosition(SourceRange range, String groupName);

  /**
   * Add a replacement of text specified by the given [range]. The [range] is
   * relative to the original source. The [buildEdit] function is used to write
   * the text that will replace the specified region.
   */
  void addReplacement(SourceRange range, void buildEdit(EditBuilder builder));

  /**
   * Add an insertion of the given [text] at the given [offset]. The [offset] is
   * relative to the original source. This is fully equivalent to
   *
   *     addInsertion(offset, (EditBuilder builder) {
   *       builder.write(text);
   *     });
   */
  void addSimpleInsertion(int offset, String text);

  /**
   * Add a replacement of the text specified by the given [range]. The [range]
   * is relative to the original source. The original content will be replaced
   * by the given [text]. This is fully equivalent to
   *
   *     addReplacement(offset, length, (EditBuilder builder) {
   *       builder.write(text);
   *     });
   */
  void addSimpleReplacement(SourceRange range, String text);
}

/**
 * A builder used to build a [LinkedEdit] region within an edit.
 *
 * Clients may not extend, implement or mix-in this class.
 */
abstract class LinkedEditBuilder {
  /**
   * Add the given [value] as a suggestion with the given [kind].
   */
  void addSuggestion(LinkedEditSuggestionKind kind, String value);

  /**
   * Add each of the given [values] as a suggestion with the given [kind].
   */
  void addSuggestions(LinkedEditSuggestionKind kind, Iterable<String> values);

  /**
   * Add the given [string] to the content of the current edit.
   */
  void write(String string);

  /**
   * Add the given [string] to the content of the current edit and then add an
   * end-of-line marker.
   */
  void writeln([String string]);
}