// Copyright (c) 2018, 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 'package:analysis_server/lsp_protocol/protocol_generated.dart';
import 'package:analysis_server/lsp_protocol/protocol_special.dart';
import 'package:analysis_server/src/analysis_server.dart';
import 'package:analysis_server/src/lsp/channel/lsp_channel.dart';
import 'package:analysis_server/src/lsp/constants.dart';
import 'package:analysis_server/src/lsp/lsp_analysis_server.dart';
import 'package:analysis_server/src/server/crash_reporting_attachments.dart';
import 'package:analysis_server/src/server/diagnostic_server.dart';
import 'package:analysis_server/src/socket_server.dart';
import 'package:analyzer/file_system/physical_file_system.dart';
import 'package:analyzer/instrumentation/instrumentation.dart';
import 'package:analyzer/src/generated/sdk.dart';

/// Instances of the class [SocketServer] implement the common parts of
/// http-based and stdio-based analysis servers.  The primary responsibility of
/// the SocketServer is to manage the lifetime of the AnalysisServer and to
/// encode and decode the JSON messages exchanged with the client.
class LspSocketServer implements AbstractSocketServer {
  @override
  final AnalysisServerOptions analysisServerOptions;

  /// The analysis server that was created when a client established a
  /// connection, or `null` if no such connection has yet been established.
  @override
  LspAnalysisServer analysisServer;

  /// The function used to create a new SDK using the default SDK.
  final DartSdkManager sdkManager;
  @override
  final DiagnosticServer diagnosticServer;
  final InstrumentationService instrumentationService;

  LspSocketServer(
    this.analysisServerOptions,
    this.diagnosticServer,
    this.sdkManager,
    this.instrumentationService,
  );

  /// Create an analysis server which will communicate with the client using the
  /// given serverChannel.
  void createAnalysisServer(LspServerCommunicationChannel serverChannel) {
    if (analysisServer != null) {
      final error = ResponseError(
        code: ServerErrorCodes.ServerAlreadyStarted,
        message: 'Server already started',
      );
      serverChannel.sendNotification(NotificationMessage(
        method: Method.window_showMessage,
        params:
            ShowMessageParams(type: MessageType.Error, message: error.message),
        jsonrpc: jsonRpcVersion,
      ));
      serverChannel.listen((Message message) {
        if (message is RequestMessage) {
          serverChannel.sendResponse(ResponseMessage(
              id: message.id, error: error, jsonrpc: jsonRpcVersion));
        }
      });
      return;
    }

    PhysicalResourceProvider resourceProvider;
    if (analysisServerOptions.fileReadMode == 'as-is') {
      resourceProvider = PhysicalResourceProvider(null,
          stateLocation: analysisServerOptions.cacheFolder);
    } else if (analysisServerOptions.fileReadMode == 'normalize-eol-always') {
      resourceProvider = PhysicalResourceProvider(
          PhysicalResourceProvider.NORMALIZE_EOL_ALWAYS,
          stateLocation: analysisServerOptions.cacheFolder);
    } else {
      throw Exception(
          'File read mode was set to the unknown mode: $analysisServerOptions.fileReadMode');
    }

    analysisServer = LspAnalysisServer(
        serverChannel,
        resourceProvider,
        analysisServerOptions,
        sdkManager,
        CrashReportingAttachmentsBuilder.empty,
        instrumentationService,
        diagnosticServer: diagnosticServer);
  }
}