#include "engine.h"
#include "platform.h"
#include "dispatcher.h"
#include <graphics/graphics.h>
#include <graphics/fonts.h>
#include <graphics/textures.h>
#include <ui/uicontainer.h>
#include <ui/uiskins.h>
#include <script/scriptcontext.h>
#include <net/connection.h>

Engine g_engine;

void Engine::init()
{
    // initialize stuff
    g_graphics.init();
    g_fonts.init();
    g_lua.init();
}

void Engine::terminate()
{
    // destroy root ui
    UIContainer::getRoot()->destroy();

    // cleanup script stuff
    g_lua.terminate();

    // poll remaning events
    g_engine.poll();

    // terminate stuff
    g_fonts.terminate();
    g_graphics.terminate();
    g_dispatcher.cleanup();
}

void Engine::poll()
{
    // poll platform events
    Platform::poll();

    // poll diaptcher tasks
    g_dispatcher.poll();

    // poll network events
    Connection::poll();
}

void Engine::run()
{
    // check if root container has elements
    const UIContainerPtr& rootContainer = UIContainer::getRoot();
    if(rootContainer->getChildCount() == 0)
        fatal("FATAL ERROR: no ui loaded at all, no reason to continue running");

    std::string fpsText;
    Size fpsTextSize;
    FontPtr defaultFont = g_uiSkins.getDefaultFont();

    m_lastFrameTicks = Platform::getTicks();
    int lastFpsTicks = m_lastFrameTicks;
    int frameCount = 0;
    int fps = 0;
    m_running = true;

    while(!m_stopping) {
        m_lastFrameTicks = Platform::getTicks();

        poll();

        // render only when visible
        if(Platform::isWindowVisible()) {
            // calculate fps
            if(m_calculateFps) {
                frameCount++;
                if(m_lastFrameTicks - lastFpsTicks >= 1000) {
                    lastFpsTicks = m_lastFrameTicks;
                    fps = frameCount;
                    frameCount = 0;

                    // update fps text
                    fpsText = make_string("FPS: ", fps);
                    fpsTextSize = defaultFont->calculateTextRectSize(fpsText);
                }
            }

            // render
            g_graphics.beginRender();

            rootContainer->render();

            // render fps
            if(m_calculateFps)
                defaultFont->renderText(fpsText, Point(g_graphics.getScreenSize().width() - fpsTextSize.width() - 10, 10));

            g_graphics.endRender();

            // swap buffers
            Platform::swapBuffers();
        }
    }

    m_stopping = false;
    m_running = false;
}

void Engine::stop()
{
    m_stopping = true;
}

void Engine::onClose()
{
    g_dispatcher.addTask(boost::bind(&ScriptContext::callModuleField, &g_lua, "App", "onClose"));
}

void Engine::onResize(const Size& size)
{
    g_graphics.resize(size);
    UIContainer::getRoot()->setSize(size);
}

void Engine::onInputEvent(const InputEvent& event)
{
    UIContainer::getRoot()->onInputEvent(event);
}