/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program 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; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: Patrick Boenzli
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_LOAD

#include "resource_manager.h"
#include "debug.h"

#include <algorithm>
#include <cassert>


namespace Resources
{
  /// Definition of the ResourceManager's ObjectList.
  ObjectListDefinition(ResourceManager);
  //! Singleton Reference to the ResourceManager
  ResourceManager* ResourceManager::_singletonRef = NULL;


  /**
   * @brief standard constructor
  */
  ResourceManager::ResourceManager ()
  : _defaultKeepLevel(0)
  {
    this->registerObject(this, ResourceManager::_objectList);
    this->setName("ResourceManager");
    this->_mainGlobalPath = Directory("./");
  }


  /**
   * @brief standard destructor
  */
  ResourceManager::~ResourceManager ()
  {
    this->unloadAllBelowKeepLevel(this->_keepLevelNames.size());
    ResourceManager::_singletonRef = NULL;
  }

  /**
   * @brief Registers a new Type to the ResourceManager.
   * @param type the Type to register.
   */
  void ResourceManager::registerType(Resources::Type* type)
  {
    this->_resourceTypes.push_back(type);
    PRINTF(5)("ResourceType '%s' added\n", type->storedClassName().c_str());
  }

  /**
   * @brief Unregisters a new Type to the ResourceManager.
   * @param type the Type to unregister.
   */
  void ResourceManager::unregisterType(Resources::Type* type)
  {
    std::vector<Resources::Type*>::iterator it = std::find (this->_resourceTypes.begin(), this->_resourceTypes.end(), type);
    if (it != this->_resourceTypes.end())
    {
      this->_resourceTypes.erase(it);
      PRINTF(5)("ResourceType '%s' removed\n", type->storedClassName().c_str());
    }
  }

  /**
   * @brief Sets the main Global path (the main path Resources are searched for)
   * @param directory the directory to set.
   * @see Resource::locateFile
   */
  void ResourceManager::setMainGlobalPath(const Directory& directory)
  {
    this->_mainGlobalPath = directory;
    this->_mainGlobalPath.open();
  }

  /**
   * @brief add a Global search path. (global paths besided the main path.)
   * @param directory a directory to add.
   */
  void ResourceManager::addGlobalPath(const Directory& directory)
  {
    std::vector<Directory>::const_iterator it = std::find(this->_globalPaths.begin(), this->_globalPaths.end(), directory);
    if (it == this->_globalPaths.end())
      this->_globalPaths.push_back(directory);
  }

  /**
   * @brief add a ResourcePath to a Type's Paths.
   * @param resourceName the Type's name of Resource to add the path to.
   * @param pathName pathName the Name of the path to add.
   * @return true on success. (if a path was added (no duplicate, and resourceName existed).
   */
  bool ResourceManager::addResourcePath(const std::string& resourceName, const std::string& pathName)
  {
    std::vector<Resources::Type*>::iterator it;
    for (it = this->_resourceTypes.begin(); it != this->_resourceTypes.end(); ++it)
      if (*(*it) == resourceName)
        return (*it)->addResourcePath(pathName);
    PRINTF(2)("ResourcePath %s could not be added to the ResourceType %s\n", pathName.c_str(), resourceName.c_str());
    return false;
  }

  /**
   * @brief add a ResourcePath to a Type's SubPaths.
   * @param resourceName the Type's name of Resource to add the subpath to.
   * @param pathName pathName the Name of the path to add.
   * @return true on success. (if a path was added (no duplicate, and resourceName existed).
   */
  bool ResourceManager::addResourceSubPath(const std::string& resourceName, const std::string& pathName)
  {
    std::vector<Resources::Type*>::iterator it;
    for (it = this->_resourceTypes.begin(); it != this->_resourceTypes.end(); ++it)
      if (*(*it) == resourceName)
        return (*it)->addResourceSubPath(pathName);
    PRINTF(2)("ResourceSubPath %s could not be added to the ResourceType %s\n", pathName.c_str(), resourceName.c_str());
    return false;
  }

  /**
   * @brief checks wether a File is inside of the MainPath.
   * @param fileInside the file to check
   * @return true if the file is inside.
   */
  bool ResourceManager::checkFileInMainPath(const File& fileInside)
  {
    return (this->_mainGlobalPath + fileInside).exists();
  }

  /**
   * @brief prepends the fileName by the MainGlobalPath (same as mainGlobalPath + '/' + fileName).
   * @param fileName The FileName to prepend
   * @returns the prepended file-name
   */
  std::string ResourceManager::prependAbsoluteMainPath(const std::string& fileName)
  {
    return (this->_mainGlobalPath + File(fileName)).name();
  }

  /**
   * @brief add a KeepLevelName (this function just counts upwards).
   * @param keepLevelName the Name of the KeepLevel to set.
   * @returns the Level the Name was set to.
   */
  unsigned int ResourceManager::addKeepLevelName(const std::string& keepLevelName)
  {
    this->_keepLevelNames.push_back(keepLevelName);
    return _keepLevelNames.size()-1;
  }

  /**
   * @param keepLevelName the Name of the KeepLevel.
   * @returns the ID of the KeepLevel named keepLevelName
   */
  unsigned int ResourceManager::getKeepLevelID(const std::string& keepLevelName) const
  {
    for (unsigned int i = 0; i < this->_keepLevelNames.size(); ++i)
      if (this->_keepLevelNames[i] == keepLevelName)
        return i;

    PRINTF(2)("KeepLevel '%s' not found. Using 0 instead\n", keepLevelName.c_str());
    return 0;
  }

  /**
   * @param keepLevelID the ID to check.
   * @return the name of the KeepLevel.
   */
  const std::string& ResourceManager::getKeepLevelName(unsigned int keepLevelID) const
  {
    assert(keepLevelID < this->_keepLevelNames.size());
    return this->_keepLevelNames[keepLevelID];
  }


  /**
   * @brief loads a Resource from a TypeName and a loadString.
   * @param resourceTypeName The Name of the Type to what to load a Resource from.
   * @param loadString the loadString to load in the Type.
   */
  void ResourceManager::loadFromLoadString(const std::string& resourceTypeName, const std::string& loadString, const KeepLevel& keepLevel)
  {
    std::vector<Resources::Type*>::const_iterator it;
    for (it = this->_resourceTypes.begin(); it != this->_resourceTypes.end(); ++it)
    {
      if (*(*it) == resourceTypeName)
      {
	(*it)->createFromString(loadString, keepLevel);
	/// TODO check if the resource was allocated!!
	return ;
      }
    }
    return ;
  }

  /**
   * @brief unloads all Resources below a certain threshhold.
   * @param keepLevel the KeepLevel below which to erase.
   *
   * @not Resources will only be erased, if th keepLevel is below, and the resources are not
   * referenced anymore.
   */
  void ResourceManager::unloadAllBelowKeepLevel(const Resources::KeepLevel& keepLevel)
  {
    std::vector<Resources::Type*>::const_iterator it;
    for (it = this->_resourceTypes.begin(); it != this->_resourceTypes.end(); ++it)
    {
      (*it)->unloadAllBelowKeepLevel(keepLevel);
    }
  }


  /**
   * @brief outputs debug information about the ResourceManager
   */
  void ResourceManager::debug() const
  {
    PRINT(0)("/==RM================================\\\n");
    PRINT(0)("| RESOURCE-MANAGER DEBUG INFORMATION |\n");
    PRINT(0)("\\====================================/\n");
    PRINT(0)(" MainGlobal search path is %s\n", this->_mainGlobalPath.name().c_str());
    if(!this->_globalPaths.empty())
    {
      PRINT(0)(" Additional Global search Paths are: ");
      for (unsigned int i = 0; i < this->_globalPaths.size(); ++i)
        PRINT(0)("'%s' ", this->_globalPaths[i].name().c_str());
      PRINT(0)("\n");
    }
    PRINT(0)(" Listing %d Types: \n", this->_resourceTypes.size());
    std::vector<Resources::Type*>::const_iterator it;
    for (it = this->_resourceTypes.begin(); it != this->_resourceTypes.end(); ++it)
    {
      (*it)->debug();
      if (it != --this->_resourceTypes.end())
        PRINT(0)(" ------------------------------------\n ");
    }

    PRINT(0)("KeepLevels are: ");
    for (unsigned int i = 0; i < this->_keepLevelNames.size(); ++i)
      PRINT(0)("%d:'%s'  ", i, this->_keepLevelNames[i].c_str());
    PRINT(0)("\n");
    PRINT(0)("=================================RM==/\n");
  }
}