/* 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.
==============================================================================*/

#include "clang_complete.hh"
#include "include_complete.h"
#include "message_handler.h"
#include "pipeline.hh"
#include "project.h"
#include "working_files.h"
using namespace ccls;

namespace {
MethodType kMethodType = "textDocument/didOpen";

// Open, view, change, close file
struct In_TextDocumentDidOpen : public NotificationInMessage {
  MethodType GetMethodType() const override { return kMethodType; }

  struct Params {
    lsTextDocumentItem textDocument;

    // ccls extension
    // If specified (e.g. ["clang++", "-DM", "a.cc"]), it overrides the project
    // entry (e.g. loaded from compile_commands.json or .ccls).
    std::vector<std::string> args;
  } params;
};
MAKE_REFLECT_STRUCT(In_TextDocumentDidOpen::Params, textDocument, args);
MAKE_REFLECT_STRUCT(In_TextDocumentDidOpen, params);
REGISTER_IN_MESSAGE(In_TextDocumentDidOpen);

struct Handler_TextDocumentDidOpen
    : BaseMessageHandler<In_TextDocumentDidOpen> {
  MethodType GetMethodType() const override { return kMethodType; }

  void Run(In_TextDocumentDidOpen *request) override {
    // NOTE: This function blocks code lens. If it starts taking a long time
    // we will need to find a way to unblock the code lens request.
    const auto &params = request->params;
    std::string path = params.textDocument.uri.GetPath();

    WorkingFile *working_file = working_files->OnOpen(params.textDocument);
    if (std::optional<std::string> cached_file_contents =
            pipeline::LoadIndexedContent(path))
      working_file->SetIndexContent(*cached_file_contents);

    QueryFile *file = nullptr;
    FindFileOrFail(db, project, std::nullopt, path, &file);
    if (file && file->def) {
      EmitSkippedRanges(working_file, file->def->skipped_ranges);
      EmitSemanticHighlighting(db, semantic_cache, working_file, file);
    }

    include_complete->AddFile(working_file->filename);
    if (params.args.size())
      project->SetFlagsForFile(params.args, path);

    // Submit new index request if it is not a header file.
    if (SourceFileLanguage(path) != LanguageId::Unknown) {
      pipeline::Index(
          path, params.args.size() ? params.args : std::vector<std::string>{},
          IndexMode::Normal);
      clang_complete->FlushSession(path);
    }

    clang_complete->NotifyView(path);
    if (g_config->diagnostics.onOpen)
      clang_complete->DiagnosticsUpdate({params.textDocument.uri});
  }
};
REGISTER_MESSAGE_HANDLER(Handler_TextDocumentDidOpen);
} // namespace