/* Copyright 2017-2018 ccls 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.
==============================================================================*/

#pragma once
#include "lsp.h"

// The kind of a completion entry.
enum class lsCompletionItemKind {
  Text = 1,
  Method = 2,
  Function = 3,
  Constructor = 4,
  Field = 5,
  Variable = 6,
  Class = 7,
  Interface = 8,
  Module = 9,
  Property = 10,
  Unit = 11,
  Value = 12,
  Enum = 13,
  Keyword = 14,
  Snippet = 15,
  Color = 16,
  File = 17,
  Reference = 18,
  Folder = 19,
  EnumMember = 20,
  Constant = 21,
  Struct = 22,
  Event = 23,
  Operator = 24,
  TypeParameter = 25,
};
MAKE_REFLECT_TYPE_PROXY(lsCompletionItemKind);

// Defines whether the insert text in a completion item should be interpreted as
// plain text or a snippet.
enum class lsInsertTextFormat {
  // The primary text to be inserted is treated as a plain string.
  PlainText = 1,

  // The primary text to be inserted is treated as a snippet.
  //
  // A snippet can define tab stops and placeholders with `$1`, `$2`
  // and `${3:foo}`. `$0` defines the final tab stop, it defaults to
  // the end of the snippet. Placeholders with equal identifiers are linked,
  // that is typing in one will update others too.
  //
  // See also:
  // https://github.com/Microsoft/vscode/blob/master/src/vs/editor/contrib/snippet/common/snippet.md
  Snippet = 2
};
MAKE_REFLECT_TYPE_PROXY(lsInsertTextFormat);

struct lsCompletionItem {
  // A set of function parameters. Used internally for signature help. Not sent
  // to vscode.
  std::vector<std::string> parameters_;

  // The label of this completion item. By default
  // also the text that is inserted when selecting
  // this completion.
  std::string label;

  // The kind of this completion item. Based of the kind
  // an icon is chosen by the editor.
  lsCompletionItemKind kind = lsCompletionItemKind::Text;

  // A human-readable string with additional information
  // about this item, like type or symbol information.
  std::string detail;

  // A human-readable string that represents a doc-comment.
  std::optional<std::string> documentation;

  // Internal information to order candidates.
  int score_;
  unsigned priority_;

  // Use <> or "" by default as include path.
  bool use_angle_brackets_ = false;

  // A string that shoud be used when comparing this item
  // with other items. When `falsy` the label is used.
  std::string sortText;

  // A string that should be used when filtering a set of
  // completion items. When `falsy` the label is used.
  std::optional<std::string> filterText;

  // A string that should be inserted a document when selecting
  // this completion. When `falsy` the label is used.
  std::string insertText;

  // The format of the insert text. The format applies to both the `insertText`
  // property and the `newText` property of a provided `textEdit`.
  lsInsertTextFormat insertTextFormat = lsInsertTextFormat::PlainText;

  // An edit which is applied to a document when selecting this completion. When
  // an edit is provided the value of `insertText` is ignored.
  //
  // *Note:* The range of the edit must be a single line range and it must
  // contain the position at which completion has been requested.
  std::optional<lsTextEdit> textEdit;

  // An std::optional array of additional text edits that are applied when
  // selecting this completion. Edits must not overlap with the main edit
  // nor with themselves.
  // std::vector<TextEdit> additionalTextEdits;

  // An std::optional command that is executed *after* inserting this
  // completion. *Note* that additional modifications to the current document
  // should be described with the additionalTextEdits-property. Command command;

  // An data entry field that is preserved on a completion item between
  // a completion and a completion resolve request.
  // data ? : any

  // Use this helper to figure out what content the completion item will insert
  // into the document, as it could live in either |textEdit|, |insertText|, or
  // |label|.
  const std::string &InsertedContent() const {
    if (textEdit)
      return textEdit->newText;
    if (!insertText.empty())
      return insertText;
    return label;
  }
};
MAKE_REFLECT_STRUCT(lsCompletionItem, label, kind, detail, documentation,
                    sortText, insertText, filterText, insertTextFormat,
                    textEdit);