#include "renderer.hpp"
#include "fader.hpp"

#include <SDL.h>

#include <OgreRoot.h>
#include <OgreRenderWindow.h>
#include <OgreTextureManager.h>
#include <OgreTexture.h>
#include <OgreHardwarePixelBuffer.h>

#include <extern/sdl4ogre/sdlwindowhelper.hpp>

#include <components/ogreinit/ogreinit.hpp>

#include <cassert>
#include <stdexcept>

using namespace Ogre;
using namespace OEngine::Render;


void OgreRenderer::cleanup()
{
    delete mFader;
    mFader = NULL;

    Ogre::Root::getSingleton().destroyRenderTarget(mWindow);
    mWindow = NULL;

    delete mOgreInit;
    mOgreInit = NULL;

    // If we don't do this, the desktop resolution is not restored on exit
    SDL_SetWindowFullscreen(mSDLWindow, 0);

    SDL_DestroyWindow(mSDLWindow);
    mSDLWindow = NULL;
}

void OgreRenderer::update(float dt)
{
    mFader->update(dt);
}

void OgreRenderer::screenshot(const std::string &file)
{
    mWindow->writeContentsToFile(file);
}

float OgreRenderer::getFPS()
{
    return mWindow->getLastFPS();
}

void OgreRenderer::configure(const std::string &logPath,
                            const std::string& renderSystem,
                             const std::string& rttMode
                            )
{
    mOgreInit = new OgreInit::OgreInit();
    mRoot = mOgreInit->init(logPath + "/ogre.log");

    RenderSystem* rs = mRoot->getRenderSystemByName(renderSystem);
    if (rs == 0)
        throw std::runtime_error ("RenderSystem with name " + renderSystem + " not found, make sure the plugins are loaded");
    mRoot->setRenderSystem(rs);

    if (rs->getName().find("OpenGL") != std::string::npos)
        rs->setConfigOption ("RTT Preferred Mode", rttMode);
}

void OgreRenderer::createWindow(const std::string &title, const WindowSettings& settings)
{
    assert(mRoot);
    mRoot->initialise(false);

    NameValuePairList params;
    params.insert(std::make_pair("title", title));
    params.insert(std::make_pair("FSAA", settings.fsaa));
    params.insert(std::make_pair("vsync", settings.vsync ? "true" : "false"));

    int pos_x = SDL_WINDOWPOS_CENTERED_DISPLAY(settings.screen),
        pos_y = SDL_WINDOWPOS_CENTERED_DISPLAY(settings.screen);

    if(settings.fullscreen)
    {
        pos_x = SDL_WINDOWPOS_UNDEFINED_DISPLAY(settings.screen);
        pos_y = SDL_WINDOWPOS_UNDEFINED_DISPLAY(settings.screen);
    }


    // Create an application window with the following settings:
    mSDLWindow = SDL_CreateWindow(
      "OpenMW",          // window title
      pos_x,             // initial x position
      pos_y,             // initial y position
      settings.window_x, // width, in pixels
      settings.window_y, // height, in pixels
      SDL_WINDOW_SHOWN
        | (settings.fullscreen ? SDL_WINDOW_FULLSCREEN : 0) | SDL_WINDOW_RESIZABLE
    );

    SFO::SDLWindowHelper helper(mSDLWindow, settings.window_x, settings.window_y, title, settings.fullscreen, params);
    if (settings.icon != "")
        helper.setWindowIcon(settings.icon);
    mWindow = helper.getWindow();


    // create the semi-transparent black background texture used by the GUI.
    // has to be created in code with TU_DYNAMIC_WRITE_ONLY param
    // so that it can be modified at runtime.
    Ogre::TextureManager::getSingleton().createManual(
                    "transparent.png",
                    Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
                    Ogre::TEX_TYPE_2D,
                    1, 1,
                    0,
                    Ogre::PF_A8R8G8B8,
                    Ogre::TU_WRITE_ONLY);

    mScene = mRoot->createSceneManager(ST_GENERIC);

    mFader = new Fader(mScene);

    mCamera = mScene->createCamera("cam");

    // Create one viewport, entire window
    mView = mWindow->addViewport(mCamera);
    // Alter the camera aspect ratio to match the viewport
    mCamera->setAspectRatio(Real(mView->getActualWidth()) / Real(mView->getActualHeight()));
}

void OgreRenderer::adjustCamera(float fov, float nearClip)
{
    mCamera->setNearClipDistance(nearClip);
    mCamera->setFOVy(Degree(fov));
}

void OgreRenderer::adjustViewport()
{
    // Alter the camera aspect ratio to match the viewport
    if(mCamera != NULL)
    {
        mView->setDimensions(0, 0, 1, 1);
        mCamera->setAspectRatio(Real(mView->getActualWidth()) / Real(mView->getActualHeight()));
    }
}

void OgreRenderer::setFov(float fov)
{
    mCamera->setFOVy(Degree(fov));
}

void OgreRenderer::windowResized(int x, int y)
{
    mWindowListener->windowResized(x,y);
}