/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import {
  IAutoClosingPair,
  StandardAutoClosingPairConditional,
  LanguageConfiguration,
} from '../../../../../vs/editor/common/modes/languageConfiguration';
import { ScopedLineTokens } from '../../../../../vs/editor/common/modes/supports';

export class CharacterPairSupport {
  static readonly DEFAULT_AUTOCLOSE_BEFORE_LANGUAGE_DEFINED = ';:.,=}])> \n\t';

  private readonly _autoClosingPairs: StandardAutoClosingPairConditional[];
  private readonly _surroundingPairs: IAutoClosingPair[];
  private readonly _autoCloseBefore: string;

  constructor(config: LanguageConfiguration) {
    if (config.autoClosingPairs) {
      this._autoClosingPairs = config.autoClosingPairs.map(
        (el) => new StandardAutoClosingPairConditional(el)
      );
    } else if (config.brackets) {
      this._autoClosingPairs = config.brackets.map(
        (b) =>
          new StandardAutoClosingPairConditional({ open: b[0], close: b[1] })
      );
    } else {
      this._autoClosingPairs = [];
    }

    if (
      config.__electricCharacterSupport &&
      config.__electricCharacterSupport.docComment
    ) {
      const docComment = config.__electricCharacterSupport.docComment;
      // IDocComment is legacy, only partially supported
      this._autoClosingPairs.push(
        new StandardAutoClosingPairConditional({
          open: docComment.open,
          close: docComment.close || '',
        })
      );
    }

    this._autoCloseBefore =
      typeof config.autoCloseBefore === 'string'
        ? config.autoCloseBefore
        : CharacterPairSupport.DEFAULT_AUTOCLOSE_BEFORE_LANGUAGE_DEFINED;

    this._surroundingPairs = config.surroundingPairs || this._autoClosingPairs;
  }

  public getAutoClosingPairs(): StandardAutoClosingPairConditional[] {
    return this._autoClosingPairs;
  }

  public getAutoCloseBeforeSet(): string {
    return this._autoCloseBefore;
  }

  public static shouldAutoClosePair(
    autoClosingPair: StandardAutoClosingPairConditional,
    context: ScopedLineTokens,
    column: number
  ): boolean {
    // Always complete on empty line
    if (context.getTokenCount() === 0) {
      return true;
    }

    const tokenIndex = context.findTokenIndexAtOffset(column - 2);
    const standardTokenType = context.getStandardTokenType(tokenIndex);
    return autoClosingPair.isOK(standardTokenType);
  }

  public getSurroundingPairs(): IAutoClosingPair[] {
    return this._surroundingPairs;
  }
}