#include "TranslationUnit.h"
#include "SourceLocation.h"
#include "Tokens.h"
#include "Utility.h"
#include <fstream>
#include <sstream>
#include <cassert>

namespace clang {

TranslationUnit::TranslationUnit(Index &index, const std::string &file_path,
  const std::vector<std::string> &command_line_args,
  const std::string &buffer, unsigned flags) {
  std::vector<const char*> args;
  for (auto &a : command_line_args) {
    args.push_back(a.c_str());
  }

  CXUnsavedFile files[1];
  files[0].Filename = file_path.c_str();
  files[0].Contents = buffer.c_str();
  files[0].Length = buffer.size();

  CXErrorCode error_code = clang_parseTranslationUnit2(
    index.cx_index, file_path.c_str(), args.data(), args.size(), files, 1, flags, &cx_tu);
  assert(!error_code);
}

TranslationUnit::TranslationUnit(Index &index, const std::string &file_path,
  const std::vector<std::string> &command_line_args, unsigned flags) {

  // TODO: only push defines for the time being. Might need to pass more flags.
  std::vector<const char*> args;
  for (const std::string& a : command_line_args) {
    if (a.size() >= 2 && a[0] == '-' && a[1] == 'D')
      args.push_back(a.c_str());
  }

  CXErrorCode error_code = clang_parseTranslationUnit2(
    index.cx_index, file_path.c_str(), args.data(), args.size(), nullptr, 0, flags, &cx_tu);
  assert(!error_code);
}

TranslationUnit::~TranslationUnit() {
  clang_disposeTranslationUnit(cx_tu);
}

void TranslationUnit::parse(Index &index, const std::string &file_path,
  const std::vector<std::string> &command_line_args,
  const std::map<std::string, std::string>  &buffers, unsigned flags) {
  std::vector<CXUnsavedFile> files;
  for (auto &buffer : buffers) {
    CXUnsavedFile file;
    file.Filename = buffer.first.c_str();
    file.Contents = buffer.second.c_str();
    file.Length = buffer.second.size();
    files.push_back(file);
  }
  std::vector<const char*> args;
  for (auto &a : command_line_args) {
    args.push_back(a.c_str());
  }
  cx_tu = clang_parseTranslationUnit(index.cx_index, file_path.c_str(), args.data(),
    args.size(), files.data(), files.size(), flags);
}

int TranslationUnit::ReparseTranslationUnit(const std::string &buffer, unsigned flags) {
  CXUnsavedFile files[1];

  auto file_path = ToString(clang_getTranslationUnitSpelling(cx_tu));

  files[0].Filename = file_path.c_str();
  files[0].Contents = buffer.c_str();
  files[0].Length = buffer.size();

  return clang_reparseTranslationUnit(cx_tu, 1, files, flags);
}

unsigned TranslationUnit::DefaultFlags() {
  auto flags =
    CXTranslationUnit_CacheCompletionResults |
    CXTranslationUnit_PrecompiledPreamble |
    CXTranslationUnit_Incomplete |
    CXTranslationUnit_IncludeBriefCommentsInCodeCompletion;
#if CINDEX_VERSION_MAJOR>0 || (CINDEX_VERSION_MAJOR==0 && CINDEX_VERSION_MINOR>=35)
  flags |= CXTranslationUnit_KeepGoing;
#endif
  return flags;
}

CodeCompleteResults TranslationUnit::get_code_completions(const std::string &buffer,
  unsigned line_number, unsigned column) {
  CodeCompleteResults results(cx_tu, buffer, line_number, column);
  return results;
}

/*
std::vector<Diagnostic> TranslationUnit::get_diagnostics() {
  std::vector<Diagnostic> diagnostics;
  for (unsigned c = 0; c < clang_getNumDiagnostics(cx_tu); c++) {
    CXDiagnostic clang_diagnostic = clang_getDiagnostic(cx_tu, c);
    diagnostics.emplace_back(Diagnostic(cx_tu, clang_diagnostic));
    clang_disposeDiagnostic(clang_diagnostic);
  }
  return diagnostics;
}
*/

/*
std::unique_ptr<Tokens> TranslationUnit::get_tokens(unsigned start_offset, unsigned end_offset) {
  auto path = ToString(clang_getTranslationUnitSpelling(cx_tu));
  SourceLocation start_location(cx_tu, path, start_offset);
  SourceLocation end_location(cx_tu, path, end_offset);
  SourceRange range(start_location, end_location);
  return std::unique_ptr<Tokens>(new Tokens(cx_tu, range));
}

std::unique_ptr<Tokens> TranslationUnit::get_tokens(unsigned start_line, unsigned start_column, unsigned end_line, unsigned end_column) {
  auto path = ToString(clang_getTranslationUnitSpelling(cx_tu));
  SourceLocation start_location(cx_tu, path, start_line, start_column);
  SourceLocation end_location(cx_tu, path, end_line, end_column);
  SourceRange range(start_location, end_location);
  return std::unique_ptr<Tokens>(new Tokens(cx_tu, range));
}
*/

Cursor TranslationUnit::document_cursor() const {
  return Cursor(clang_getTranslationUnitCursor(cx_tu));
}

/*
Cursor TranslationUnit::get_cursor(std::string path, unsigned offset) {
  SourceLocation location(cx_tu, path, offset);
  return Cursor(clang_getCursor(cx_tu, location.cx_location));
}

Cursor TranslationUnit::get_cursor(std::string path, unsigned line, unsigned column) {
  SourceLocation location(cx_tu, path, line, column);
  return Cursor(clang_getCursor(cx_tu, location.cx_location));
}
*/

}