/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

You may use this sample code for anything you like, it is not covered by the
LGPL like the rest of the engine.
-----------------------------------------------------------------------------
*/
/*
-----------------------------------------------------------------------------
Filename:    ExampleLoadingBar.h
Description: Defines an example loading progress bar which you can use during
startup, level changes etc to display loading progress.
IMPORTANT: Note that this progress bar relies on you having the OgreCore.zip
package already added to a resource group called 'Bootstrap' - this provides
the basic resources required for the progress bar and will be loaded automatically.
*/
#include "LoadingBar.h"

#include "services/input/Input.h"
#include "framework/ShutdownException.h"
#include "framework/MainLoopController.h"

#include <OgreFontManager.h>
#include <OgreRenderWindow.h>
#include <Ogre.h>

#include <components/cegui/CEGUISetup.h>
#include <CEGUI/ImageManager.h>

using namespace Ogre;


namespace Ember::OgreView::Gui {


LoadingBar::LoadingBar(const Cegui::CEGUISetup& ceguiSetup, MainLoopController& mainLoopController) :
		mGuiSetup(ceguiSetup),
		mProgress(0),
		mProgressBarMaxSize(0),
		mProgressBarMaxLeft(0),
		mProgressBarScriptSize(0),
		mMainLoopController(mainLoopController) {


	CEGUI::ImageManager::getSingleton().loadImageset("cegui/datafiles/imagesets/splash.imageset", "");
	CEGUI::ImageManager::getSingleton().loadImageset("cegui/datafiles/imagesets/progressbar.imageset", "");
	CEGUI::ImageManager::getSingleton().loadImageset("cegui/datafiles/imagesets/progressbar_frame.imageset", "");

	mSheet.reset(CEGUI::WindowManager::getSingleton().loadLayoutFromFile("cegui/datafiles/layouts/Splash.layout"));
	mSheet->setDestroyedByParent(false);

	CEGUI::System::getSingleton().getDefaultGUIContext().setRootWindow(mSheet.get());
	mSheet->update(0);

	mVersionText = mSheet->getChildRecursive("version");
	mProgressWindow = mSheet->getChildRecursive("progress");
	mDescriptionText = mSheet->getChildRecursive("details");

}

LoadingBar::~LoadingBar() = default;

void LoadingBar::addSection(LoadingBarSection* section) {
	mSections.push_back(section);
}


void LoadingBar::setProgress(float progress) {
	progress = std::max(0.f, std::min(1.0f, progress));
	//make the black blocking block a little bit smaller and move it to the right
	mProgressWindow->setWidth({1.0f - progress, 0});
	mProgressWindow->setXPosition({progress, 0});
	updateRender();
	mProgress = progress;
}

void LoadingBar::increase(float amount) {
	setProgress(mProgress + amount);
}

void LoadingBar::setCaption(const std::string& caption) {
	mDescriptionText->setText(caption);
	updateRender();
}

void LoadingBar::setVersionText(const std::string& versionText) {
	mVersionText->setText(versionText);
	updateRender();
}

void LoadingBar::updateRender(bool forceUpdate) {
	if (mTimer.getMilliseconds() > (1000 / 60) || forceUpdate) {
		try {
			Input::getSingleton().processInput(std::chrono::steady_clock::now());
			if (mMainLoopController.shouldQuit() || mGuiSetup.getRenderWindow().isClosed()) {
				throw ShutdownException("Aborting startup");
			}
			mGuiSetup.getRenderWindow().update(false);
			CEGUI::System::getSingleton().getDefaultGUIContext().draw();
			mGuiSetup.getRenderWindow().swapBuffers();
		} catch (const std::exception& ex) {
			logger->error("Error when updating render for loading bar: {}", ex.what());
		}
		mTimer.reset();
	}
}

LoadingBarSection::LoadingBarSection(LoadingBar& loadingBar, float size, std::string name)
		: mSize(size), mLoadingBar(loadingBar), mAccumulatedSize(0), mName(std::move(name)), mActive(false) {
}

const std::string& LoadingBarSection::getName() const {
	return mName;
}

void LoadingBarSection::setCaption(const std::string& caption) {
	mLoadingBar.setCaption(caption);
}

float LoadingBarSection::getSize() const {
	return mSize;
}

void LoadingBarSection::tick(float tickSize) {
	if (mAccumulatedSize < 1.0) {
		mLoadingBar.increase(mSize * tickSize);
		mAccumulatedSize += tickSize;
	}
}

void LoadingBarSection::setProgress(float progress) {
	if (mAccumulatedSize < 1.0 && mAccumulatedSize < progress) {
		mLoadingBar.increase(mSize * (mAccumulatedSize - progress));
		mAccumulatedSize = progress;
		mLoadingBar.updateRender();
	}
}

void LoadingBarSection::deactivate() {
	mActive = false;
}


ResourceGroupLoadingBarSection::ResourceGroupLoadingBarSection(LoadingBarSection& section,
															   size_t numGroupsInit,
															   size_t numGroupsLoad,
															   Ogre::Real initProportion)
		: mInitProportion(initProportion),
		  mNumGroupsInit(numGroupsInit),
		  mNumGroupsLoad(numGroupsLoad),
		  mSection(section),
		  mProgressBarInc(0),
		  mCompletedSections(0) {
	// self is listener
	ResourceGroupManager::getSingleton().addResourceGroupListener(this);
}

ResourceGroupLoadingBarSection::~ResourceGroupLoadingBarSection() {
	ResourceGroupManager::getSingleton().removeResourceGroupListener(this);
}

// ResourceGroupListener callbacks
void ResourceGroupLoadingBarSection::resourceGroupScriptingStarted(const String& groupName, size_t scriptCount) {
	if (mNumGroupsInit == 0) {
		return; //avoid divide-by-zero
	}
	if (mNumGroupsLoad != 0) {
		mProgressBarInc = mInitProportion / (float) mNumGroupsInit;
	} else {
		mProgressBarInc = 1.0f / (float) mNumGroupsInit;
	}

	if (scriptCount == 0) {
		//no scripts will be loaded, so we'll have to conclude this group here and now
		mSection.tick(mProgressBarInc);
	}

	mProgressBarInc /= (Real) scriptCount;
	mSection.setCaption("Parsing scripts...");
}

void ResourceGroupLoadingBarSection::resourceGroupScriptingEnded(const Ogre::String& groupName) {
	mCompletedSections++;
	mSection.setProgress((float) mCompletedSections / (float) (mNumGroupsInit + mNumGroupsLoad));
}

void ResourceGroupLoadingBarSection::scriptParseStarted(const String& scriptName, bool& skipThisScript) {
	mSection.setCaption(scriptName);
}

void ResourceGroupLoadingBarSection::scriptParseEnded(const Ogre::String& scriptName, bool) {
	//make the black blocking block a little bit smaller and move it to the right
	mSection.tick(mProgressBarInc);
}

void ResourceGroupLoadingBarSection::resourceGroupLoadStarted(const String& groupName, size_t resourceCount) {
	if (mNumGroupsLoad == 0) {
		return; //avoid divide-by-zero
	}
	if (mNumGroupsInit) {
		mProgressBarInc = (1.0f - mInitProportion) / (float) mNumGroupsLoad;
	} else {
		mProgressBarInc = 1.0f / (float) mNumGroupsLoad;
	}

	if (resourceCount == 0) {
		//no resources will be loaded, so we'll have to conclude this group here and now
		mSection.tick(mProgressBarInc);
	}

	mProgressBarInc /= (Real) resourceCount;
	mSection.setCaption("Loading resources...");
}

void ResourceGroupLoadingBarSection::resourceLoadStarted(const ResourcePtr& resource) {
	mSection.setCaption(resource->getName());
}

void ResourceGroupLoadingBarSection::resourceLoadEnded() {
	mSection.tick(mProgressBarInc);
}

void ResourceGroupLoadingBarSection::resourceGroupLoadEnded(const String& groupName) {
	mCompletedSections++;
	mSection.setProgress((float) mCompletedSections / (float) (mNumGroupsInit + mNumGroupsLoad));
}

}


