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Language Server Protocol implementation for 1C (BSL) - 1C:Enterprise 8 and OneScript languages.
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/*
 * This file is a part of BSL Language Server.
 *
 * Copyright (c) 2018-2024
 * Alexey Sosnoviy , Nikita Fedkin  and contributors
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 *
 * BSL Language Server is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * BSL Language Server is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with BSL Language Server.
 */
package com.github._1c_syntax.bsl.languageserver.providers;

import com.github._1c_syntax.bsl.languageserver.ClientCapabilitiesHolder;
import com.github._1c_syntax.bsl.languageserver.LanguageClientHolder;
import com.github._1c_syntax.bsl.languageserver.configuration.events.LanguageServerConfigurationChangedEvent;
import com.github._1c_syntax.bsl.languageserver.context.DocumentContext;
import com.github._1c_syntax.bsl.languageserver.inlayhints.InlayHintSupplier;
import lombok.RequiredArgsConstructor;
import org.eclipse.lsp4j.ClientCapabilities;
import org.eclipse.lsp4j.InlayHint;
import org.eclipse.lsp4j.InlayHintParams;
import org.eclipse.lsp4j.InlayHintWorkspaceCapabilities;
import org.eclipse.lsp4j.WorkspaceClientCapabilities;
import org.eclipse.lsp4j.services.LanguageClient;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Провайдер, обрабатывающий запросы {@code textDocument/inlayHint} и {@code inlayHint/resolve}.
 *
 * @see Inlay hint request.
 * @see Inlay hint resolve request
 */
@Component
@RequiredArgsConstructor
public class InlayHintProvider {

  @Qualifier("enabledInlayHintSuppliers")
  private final ObjectProvider> enabledInlayHintSuppliersProvider;
  private final ClientCapabilitiesHolder clientCapabilitiesHolder;
  private final LanguageClientHolder clientHolder;

  private List enabledInlayHintSuppliers;

  @PostConstruct
  protected void init() {
    enabledInlayHintSuppliers = enabledInlayHintSuppliersProvider.getObject();
  }

  /**
   * Получить список inlay hints в документе.
   *
   * @param documentContext Документ, для которого запрашиваются inlay hints.
   * @param params          Параметры запроса.
   * @return Список inlay hints в документе
   */
  public List getInlayHint(DocumentContext documentContext, InlayHintParams params) {
    return enabledInlayHintSuppliers.stream()
      .map(supplier -> supplier.getInlayHints(documentContext, params))
      .flatMap(Collection::stream)
      .collect(Collectors.toList());
  }

  /**
   * Обработчик события {@link LanguageServerConfigurationChangedEvent}.
   * 
   * В случае поддержки запроса подключенным клиентом инициирует запрос {@code workspace/inlayHint/refresh}.
   *
   * @param event Событие
   */
  @EventListener
  public void handleEvent(LanguageServerConfigurationChangedEvent event) {
    enabledInlayHintSuppliers = enabledInlayHintSuppliersProvider.getObject();

    refreshInlayHints();
  }

  /**
   * Отправить запрос на обновление inlay hints.
   */
  public void refreshInlayHints() {
    boolean refreshSupport = clientCapabilitiesHolder.getCapabilities()
      .map(ClientCapabilities::getWorkspace)
      .map(WorkspaceClientCapabilities::getInlayHint)
      .map(InlayHintWorkspaceCapabilities::getRefreshSupport)
      .orElse(Boolean.FALSE);

    if (refreshSupport) {
      clientHolder.execIfConnected(LanguageClient::refreshInlayHints);
    }
  }
}