//
//  KRSceneManager.cpp
//  Kraken Engine
//
//  Copyright 2022 Kearwood Gilbert. All rights reserved.
//  
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//  permitted provided that the following conditions are met:
//  
//  1. Redistributions of source code must retain the above copyright notice, this list of
//  conditions and the following disclaimer.
//  
//  2. Redistributions in binary form must reproduce the above copyright notice, this list
//  of conditions and the following disclaimer in the documentation and/or other materials
//  provided with the distribution.
//  
//  THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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//

#include "KRSceneManager.h"
#include "KRScene.h"

KRSceneManager::KRSceneManager(KRContext &context) : KRResourceManager(context){
}

KRSceneManager::~KRSceneManager() {
    for(unordered_map<std::string, KRScene *>::iterator itr = m_scenes.begin(); itr != m_scenes.end(); ++itr){
        delete (*itr).second;
    }
    m_scenes.clear();
}

KRResource* KRSceneManager::loadResource(const std::string& name, const std::string& extension, KRDataBlock* data)
{
  if (extension.compare("krscene") == 0) {
    return loadScene(name, data);
  }
  return nullptr;
}

KRResource* KRSceneManager::getResource(const std::string& name, const std::string& extension)
{
  if (extension.compare("krscene") == 0) {
    return getScene(name);
  }
  return nullptr;
}

KRScene *KRSceneManager::loadScene(const std::string &name, KRDataBlock *data) {
    std::lock_guard<std::mutex> lock(m_mutex);
    std::string lowerName = name;
    std::transform(lowerName.begin(), lowerName.end(),
                   lowerName.begin(), ::tolower);
    
    KRScene *pScene = KRScene::Load(*m_pContext, name, data);
    m_scenes[lowerName] = pScene;
    return pScene;
}


KRScene* KRSceneManager::createScene(const std::string& name)
{
  // TODO: Check for name conflicts
  KRScene* pScene = new KRScene(*m_pContext, name);
  add(pScene);
  return pScene;
}

void KRSceneManager::add(KRScene *scene)
{
  std::lock_guard<std::mutex> lock(m_mutex);
    std::string lowerName = scene->getName();
    std::transform(lowerName.begin(), lowerName.end(),
                   lowerName.begin(), ::tolower);
    m_scenes[lowerName] = scene;
}

KRScene *KRSceneManager::getScene(const std::string &name) {
  std::lock_guard<std::mutex> lock(m_mutex);
    std::string lowerName = name;
    std::transform(lowerName.begin(), lowerName.end(),
                   lowerName.begin(), ::tolower);
    
    static unordered_map<std::string, KRScene *>::iterator scene_itr = m_scenes.find(lowerName);
    if(scene_itr != m_scenes.end()) {
        return (*scene_itr).second;
    } else {
        return NULL;
    }
}

KRScene *KRSceneManager::getFirstScene() {
    std::lock_guard<std::mutex> lock(m_mutex);
    unordered_map<std::string, KRScene *>::iterator scene_itr = m_scenes.begin();
    if(scene_itr != m_scenes.end()) {
        return (*scene_itr).second;
    } else {
        return NULL;
    }
}

unordered_map<std::string, KRScene *> &KRSceneManager::getScenes() {
    return m_scenes;
}