#include "meson.h"
#include "filesystem.h"
#include "compile_commands.h"
#include <regex>
#include "terminal.h"
#include "dialogs.h"
#include "config.h"

Meson::Meson(const boost::filesystem::path &path) {
  const auto find_project=[this](const boost::filesystem::path &file_path) {
    for(auto &line: filesystem::read_lines(file_path)) {
      const static std::regex project_regex("^ *project *\\(.*\\r?$", std::regex::icase);
      std::smatch sm;
      if(std::regex_match(line, sm, project_regex))
        return true;
    }
    return false;
  };
  
  auto search_path=boost::filesystem::is_directory(path)?path:path.parent_path();
  while(true) {
    auto search_file=search_path/"meson.build";
    if(boost::filesystem::exists(search_file)) {
      if(find_project(search_file)) {
        project_path=search_path;
        break;
      }
    }
    if(search_path==search_path.root_directory())
      break;
    search_path=search_path.parent_path();
  }
}

bool Meson::update_default_build(const boost::filesystem::path &default_build_path, bool force) {
  if(project_path.empty() || !boost::filesystem::exists(project_path/"meson.build") || default_build_path.empty())
      return false;
  
  if(!boost::filesystem::exists(default_build_path)) {
    boost::system::error_code ec;
    boost::filesystem::create_directories(default_build_path, ec);
    if(ec) {
      Terminal::get().print("Error: could not create "+default_build_path.string()+": "+ec.message()+"\n", true);
      return false;
    }
  }
  
  auto compile_commands_path=default_build_path/"compile_commands.json";
  bool compile_commands_exists=boost::filesystem::exists(compile_commands_path);
  if(!force && compile_commands_exists)
    return true;
  
  Dialog::Message message("Creating/updating default build");
  auto exit_status=Terminal::get().process(Config::get().project.meson.command+' '+(compile_commands_exists?"--internal regenerate ":"")+
                                           filesystem::escape_argument(project_path.string()), default_build_path);
  message.hide();
  if(exit_status==EXIT_SUCCESS)
    return true;
  return false;
}

bool Meson::update_debug_build(const boost::filesystem::path &debug_build_path, bool force) {
  if(project_path.empty() || !boost::filesystem::exists(project_path/"meson.build") || debug_build_path.empty())
    return false;
  
  if(!boost::filesystem::exists(debug_build_path)) {
    boost::system::error_code ec;
    boost::filesystem::create_directories(debug_build_path, ec);
    if(ec) {
      Terminal::get().print("Error: could not create "+debug_build_path.string()+": "+ec.message()+"\n", true);
      return false;
    }
  }
  
  bool compile_commands_exists=boost::filesystem::exists(debug_build_path/"compile_commands.json");
  if(!force && compile_commands_exists)
    return true;
  
  Dialog::Message message("Creating/updating debug build");
  auto exit_status=Terminal::get().process(Config::get().project.meson.command+' '+(compile_commands_exists?"--internal regenerate ":"")+
                                           "--buildtype debug "+filesystem::escape_argument(project_path.string()), debug_build_path);
  message.hide();
  if(exit_status==EXIT_SUCCESS)
    return true;
  return false;
}

boost::filesystem::path Meson::get_executable(const boost::filesystem::path &build_path, const boost::filesystem::path &file_path) {
  CompileCommands compile_commands(build_path);
  
  size_t best_match_size=-1;
  boost::filesystem::path best_match_executable;
  for(auto &command: compile_commands.commands) {
    auto command_file=filesystem::get_normal_path(command.file);
    auto values=command.parameter_values("-o");
    if(!values.empty()) {
      size_t pos;
      if((pos=values[0].find("@"))!=std::string::npos) {
        if(pos+1<values[0].size() && values[0].compare(pos+1, 3, "exe")==0) {
          auto executable=build_path/values[0].substr(0, pos);
          if(command_file==file_path)
            return executable;
          auto command_file_directory=command_file.parent_path();
          if(filesystem::file_in_path(file_path, command_file_directory)) {
            auto size=static_cast<size_t>(std::distance(command_file_directory.begin(), command_file_directory.end()));
            if(best_match_size==static_cast<size_t>(-1) || best_match_size<size) {
              best_match_size=size;
              best_match_executable=executable;
            }
          }
        }
      }
    }
  }
  
  return best_match_executable;
}