ai_sl.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
#include "../debug.h"
 
#include "saveload.h"
#include "compat/ai_sl_compat.h"
 
#include "../company_base.h"
#include "../string_func.h"
 
#include "../ai/ai.hpp"
#include "../ai/ai_config.hpp"
#include "../network/network.h"
#include "../ai/ai_instance.hpp"
 
#include "../safeguards.h"
 
static std::string _ai_saveload_name;
static int         _ai_saveload_version;
static std::string _ai_saveload_settings;
static bool        _ai_saveload_is_random;
 
static const SaveLoad _ai_company_desc[] = {
     SLEG_SSTR("name",      _ai_saveload_name,         SLE_STR),
     SLEG_SSTR("settings",  _ai_saveload_settings,     SLE_STR),
  SLEG_CONDVAR("version",   _ai_saveload_version,   SLE_UINT32, SLV_108, SL_MAX_VERSION),
  SLEG_CONDVAR("is_random", _ai_saveload_is_random,   SLE_BOOL, SLV_136, SL_MAX_VERSION),
};
 
static void SaveReal_AIPL(int *index_ptr)
{
  CompanyID index = (CompanyID)*index_ptr;
  AIConfig *config = AIConfig::GetConfig(index);
 
  if (config->HasScript()) {
    _ai_saveload_name = config->GetName();
    _ai_saveload_version = config->GetVersion();
  } else {
    /* No AI is configured for this so store an empty string as name. */
    _ai_saveload_name.clear();
    _ai_saveload_version = -1;
  }
 
  _ai_saveload_is_random = config->IsRandom();
  _ai_saveload_settings = config->SettingsToString();
 
  SlObject(nullptr, _ai_company_desc);
  /* If the AI was active, store its data too */
  if (Company::IsValidAiID(index)) AI::Save(index);
}
 
struct AIPLChunkHandler : ChunkHandler {
  AIPLChunkHandler() : ChunkHandler('AIPL', CH_TABLE) {}
 
  void Load() const override
  {
    const std::vector<SaveLoad> slt = SlCompatTableHeader(_ai_company_desc, _ai_company_sl_compat);
 
    /* Free all current data */
    for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
      AIConfig::GetConfig(c, AIConfig::SSS_FORCE_GAME)->Change(std::nullopt);
    }
 
    CompanyID index;
    while ((index = (CompanyID)SlIterateArray()) != (CompanyID)-1) {
      if (index >= MAX_COMPANIES) SlErrorCorrupt("Too many AI configs");
 
      _ai_saveload_is_random = false;
      _ai_saveload_version = -1;
      SlObject(nullptr, slt);
 
      if (_game_mode == GM_MENU || (_networking && !_network_server)) {
        if (Company::IsValidAiID(index)) AIInstance::LoadEmpty();
        continue;
      }
 
      AIConfig *config = AIConfig::GetConfig(index, AIConfig::SSS_FORCE_GAME);
      if (_ai_saveload_name.empty()) {
        /* A random AI. */
        config->Change(std::nullopt, -1, false, true);
      } else {
        config->Change(_ai_saveload_name, _ai_saveload_version, false, _ai_saveload_is_random);
        if (!config->HasScript()) {
          /* No version of the AI available that can load the data. Try to load the
           * latest version of the AI instead. */
          config->Change(_ai_saveload_name, -1, false, _ai_saveload_is_random);
          if (!config->HasScript()) {
            if (_ai_saveload_name.compare("%_dummy") != 0) {
              Debug(script, 0, "The savegame has an AI by the name '{}', version {} which is no longer available.", _ai_saveload_name, _ai_saveload_version);
              Debug(script, 0, "A random other AI will be loaded in its place.");
            } else {
              Debug(script, 0, "The savegame had no AIs available at the time of saving.");
              Debug(script, 0, "A random available AI will be loaded now.");
            }
          } else {
            Debug(script, 0, "The savegame has an AI by the name '{}', version {} which is no longer available.", _ai_saveload_name, _ai_saveload_version);
            Debug(script, 0, "The latest version of that AI has been loaded instead, but it'll not get the savegame data as it's incompatible.");
          }
          /* Make sure the AI doesn't get the saveload data, as it was not the
           *  writer of the saveload data in the first place */
          _ai_saveload_version = -1;
        }
      }
 
      config->StringToSettings(_ai_saveload_settings);
 
      /* Load the AI saved data */
      if (Company::IsValidAiID(index)) config->SetToLoadData(AIInstance::Load(_ai_saveload_version));
    }
  }
 
  void Save() const override
  {
    SlTableHeader(_ai_company_desc);
 
    for (int i = COMPANY_FIRST; i < MAX_COMPANIES; i++) {
      SlSetArrayIndex(i);
      SlAutolength((AutolengthProc *)SaveReal_AIPL, &i);
    }
  }
};
 
static const AIPLChunkHandler AIPL;
static const ChunkHandlerRef ai_chunk_handlers[] = {
  AIPL,
};
 
extern const ChunkHandlerTable _ai_chunk_handlers(ai_chunk_handlers);