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/*
 * This file is a part of BSL Language Server.
 *
 * Copyright (c) 2018-2022
 * 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;

import com.github._1c_syntax.bsl.languageserver.configuration.LanguageServerConfiguration;
import com.github._1c_syntax.bsl.languageserver.context.ServerContext;
import com.github._1c_syntax.bsl.languageserver.jsonrpc.DiagnosticParams;
import com.github._1c_syntax.bsl.languageserver.jsonrpc.Diagnostics;
import com.github._1c_syntax.bsl.languageserver.jsonrpc.ProtocolExtension;
import com.github._1c_syntax.bsl.languageserver.providers.DocumentSymbolProvider;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.eclipse.lsp4j.CallHierarchyRegistrationOptions;
import org.eclipse.lsp4j.ClientCapabilities;
import org.eclipse.lsp4j.CodeActionKind;
import org.eclipse.lsp4j.CodeActionOptions;
import org.eclipse.lsp4j.CodeLensOptions;
import org.eclipse.lsp4j.ColorProviderOptions;
import org.eclipse.lsp4j.DefinitionOptions;
import org.eclipse.lsp4j.DocumentFormattingOptions;
import org.eclipse.lsp4j.DocumentLinkOptions;
import org.eclipse.lsp4j.DocumentRangeFormattingOptions;
import org.eclipse.lsp4j.DocumentSymbolOptions;
import org.eclipse.lsp4j.FoldingRangeProviderOptions;
import org.eclipse.lsp4j.HoverOptions;
import org.eclipse.lsp4j.InitializeParams;
import org.eclipse.lsp4j.InitializeResult;
import org.eclipse.lsp4j.ReferenceOptions;
import org.eclipse.lsp4j.RenameCapabilities;
import org.eclipse.lsp4j.RenameOptions;
import org.eclipse.lsp4j.SaveOptions;
import org.eclipse.lsp4j.SelectionRangeRegistrationOptions;
import org.eclipse.lsp4j.ServerCapabilities;
import org.eclipse.lsp4j.ServerInfo;
import org.eclipse.lsp4j.TextDocumentClientCapabilities;
import org.eclipse.lsp4j.TextDocumentSyncKind;
import org.eclipse.lsp4j.TextDocumentSyncOptions;
import org.eclipse.lsp4j.WorkspaceSymbolOptions;
import org.eclipse.lsp4j.jsonrpc.messages.Either;
import org.eclipse.lsp4j.services.LanguageServer;
import org.eclipse.lsp4j.services.TextDocumentService;
import org.eclipse.lsp4j.services.WorkspaceService;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

@Slf4j
@Component
@RequiredArgsConstructor
public class BSLLanguageServer implements LanguageServer, ProtocolExtension {

  private final LanguageServerConfiguration configuration;
  private final BSLTextDocumentService textDocumentService;
  private final BSLWorkspaceService workspaceService;
  private final ClientCapabilitiesHolder clientCapabilitiesHolder;
  private final ServerContext context;
  private final ServerInfo serverInfo;
  private boolean shutdownWasCalled;

  @Override
  public CompletableFuture initialize(InitializeParams params) {

    clientCapabilitiesHolder.setCapabilities(params.getCapabilities());
    
    setConfigurationRoot(params);
    CompletableFuture.runAsync(context::populateContext);

    var capabilities = new ServerCapabilities();
    capabilities.setTextDocumentSync(getTextDocumentSyncOptions());
    capabilities.setDocumentRangeFormattingProvider(getDocumentRangeFormattingProvider());
    capabilities.setDocumentFormattingProvider(getDocumentFormattingProvider());
    capabilities.setFoldingRangeProvider(getFoldingRangeProvider());
    capabilities.setDocumentSymbolProvider(getDocumentSymbolProvider());
    capabilities.setCodeActionProvider(getCodeActionProvider());
    capabilities.setCodeLensProvider(getCodeLensProvider());
    capabilities.setDocumentLinkProvider(getDocumentLinkProvider());
    capabilities.setWorkspaceSymbolProvider(getWorkspaceProvider());
    capabilities.setHoverProvider(getHoverProvider());
    capabilities.setReferencesProvider(getReferencesProvider());
    capabilities.setDefinitionProvider(getDefinitionProvider());
    capabilities.setCallHierarchyProvider(getCallHierarchyProvider());
    capabilities.setSelectionRangeProvider(getSelectionRangeProvider());
    capabilities.setColorProvider(getColorProvider());
    capabilities.setRenameProvider(getRenameProvider(params));

    var result = new InitializeResult(capabilities, serverInfo);

    return CompletableFuture.completedFuture(result);
  }

  private void setConfigurationRoot(InitializeParams params) {
    var workspaceFolders = params.getWorkspaceFolders();
    if (workspaceFolders == null || workspaceFolders.isEmpty()) {
      return;
    }

    String rootUri = workspaceFolders.get(0).getUri();
    Path rootPath;
    try {
      rootPath = new File(new URI(rootUri).getPath()).getCanonicalFile().toPath();
    } catch (URISyntaxException | IOException e) {
      LOGGER.error("Can't read root URI from initialization params.", e);
      return;
    }

    Path configurationRoot = LanguageServerConfiguration.getCustomConfigurationRoot(
      configuration,
      rootPath);
    context.setConfigurationRoot(configurationRoot);
  }

  @Override
  public CompletableFuture shutdown() {
    shutdownWasCalled = true;
    textDocumentService.reset();
    context.clear();
    return CompletableFuture.completedFuture(Boolean.TRUE);
  }

  @Override
  public void exit() {
    int status = shutdownWasCalled ? 0 : 1;
    System.exit(status);
  }

  /**
   * {@inheritDoc}
   * 

   * См. {@link BSLTextDocumentService#diagnostics(DiagnosticParams)}
   */
  @Override
  public CompletableFuture diagnostics(DiagnosticParams params) {
    return textDocumentService.diagnostics(params);
  }

  @Override
  public TextDocumentService getTextDocumentService() {
    return textDocumentService;
  }

  @Override
  public WorkspaceService getWorkspaceService() {
    return workspaceService;
  }

  private static TextDocumentSyncOptions getTextDocumentSyncOptions() {
    var textDocumentSync = new TextDocumentSyncOptions();

    textDocumentSync.setOpenClose(Boolean.TRUE);
    textDocumentSync.setChange(TextDocumentSyncKind.Full);
    textDocumentSync.setWillSave(Boolean.FALSE);
    textDocumentSync.setWillSaveWaitUntil(Boolean.FALSE);

    var save = new SaveOptions();
    save.setIncludeText(Boolean.FALSE);

    textDocumentSync.setSave(save);

    return textDocumentSync;
  }

  private static CodeActionOptions getCodeActionProvider() {
    var codeActionOptions = new CodeActionOptions();
    codeActionOptions.setWorkDoneProgress(Boolean.FALSE);
    codeActionOptions.setResolveProvider(Boolean.FALSE);

    var codeActionKinds = List.of(
      CodeActionKind.QuickFix,
      CodeActionKind.Refactor
    );

    codeActionOptions.setCodeActionKinds(codeActionKinds);

    return codeActionOptions;
  }

  private static DocumentSymbolOptions getDocumentSymbolProvider() {
    var documentSymbolOptions = new DocumentSymbolOptions();
    documentSymbolOptions.setWorkDoneProgress(Boolean.FALSE);
    documentSymbolOptions.setLabel(DocumentSymbolProvider.LABEL);
    return documentSymbolOptions;
  }

  private static FoldingRangeProviderOptions getFoldingRangeProvider() {
    var foldingRangeProviderOptions = new FoldingRangeProviderOptions();
    foldingRangeProviderOptions.setWorkDoneProgress(Boolean.FALSE);

    return foldingRangeProviderOptions;
  }

  private static DocumentFormattingOptions getDocumentFormattingProvider() {
    var documentFormattingOptions = new DocumentFormattingOptions();
    documentFormattingOptions.setWorkDoneProgress(Boolean.FALSE);
    return documentFormattingOptions;
  }

  private static DocumentRangeFormattingOptions getDocumentRangeFormattingProvider() {
    var documentRangeFormattingOptions = new DocumentRangeFormattingOptions();
    documentRangeFormattingOptions.setWorkDoneProgress(Boolean.FALSE);
    return documentRangeFormattingOptions;
  }

  private static CodeLensOptions getCodeLensProvider() {
    var codeLensOptions = new CodeLensOptions();
    codeLensOptions.setResolveProvider(Boolean.TRUE);
    codeLensOptions.setWorkDoneProgress(Boolean.FALSE);
    return codeLensOptions;
  }

  private static DocumentLinkOptions getDocumentLinkProvider() {
    var documentLinkOptions = new DocumentLinkOptions();
    documentLinkOptions.setResolveProvider(Boolean.FALSE);
    return documentLinkOptions;
  }

  private static HoverOptions getHoverProvider() {
    var hoverOptions = new HoverOptions();
    hoverOptions.setWorkDoneProgress(Boolean.FALSE);
    return hoverOptions;
  }

  private static DefinitionOptions getDefinitionProvider() {
    var definitionOptions = new DefinitionOptions();
    definitionOptions.setWorkDoneProgress(Boolean.FALSE);
    return definitionOptions;
  }

  private static ReferenceOptions getReferencesProvider() {
    var referenceOptions = new ReferenceOptions();
    referenceOptions.setWorkDoneProgress(Boolean.FALSE);
    return referenceOptions;
  }

  private static CallHierarchyRegistrationOptions getCallHierarchyProvider() {
    var callHierarchyRegistrationOptions = new CallHierarchyRegistrationOptions();
    callHierarchyRegistrationOptions.setWorkDoneProgress(Boolean.FALSE);
    return callHierarchyRegistrationOptions;
  }

  private static WorkspaceSymbolOptions getWorkspaceProvider() {
    var workspaceSymbolOptions = new WorkspaceSymbolOptions();
    workspaceSymbolOptions.setWorkDoneProgress(Boolean.FALSE);
    return workspaceSymbolOptions;
  }

  private static SelectionRangeRegistrationOptions getSelectionRangeProvider() {
    var selectionRangeRegistrationOptions = new SelectionRangeRegistrationOptions();
    selectionRangeRegistrationOptions.setWorkDoneProgress(Boolean.FALSE);
    return selectionRangeRegistrationOptions;
  }

  private static ColorProviderOptions getColorProvider() {
    var colorProviderOptions = new ColorProviderOptions();
    colorProviderOptions.setWorkDoneProgress(Boolean.FALSE);
    return colorProviderOptions;
  }

  private static Either getRenameProvider(InitializeParams params) {

    if (Boolean.TRUE.equals(getRenamePrepareSupport(params))) {

      var renameOptions = new RenameOptions();
      renameOptions.setWorkDoneProgress(Boolean.FALSE);
      renameOptions.setPrepareProvider(Boolean.TRUE);

      return Either.forRight(renameOptions);

    } else {

      return Either.forLeft(Boolean.TRUE);

    }

  }

  private static Boolean getRenamePrepareSupport(InitializeParams params) {
    return Optional.of(params)
      .map(InitializeParams::getCapabilities)
      .map(ClientCapabilities::getTextDocument)
      .map(TextDocumentClientCapabilities::getRename)
      .map(RenameCapabilities::getPrepareSupport)
      .orElse(false);
  }

}
    

    

    

            

    

            



    
    






    
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