// Python includes
#include <Python.h>

// Stl includes
#include <fstream>

// Qt includes
#include <QResource>
#include <QMetaType>
#include <QFile>
#include <QDir>

// hyperion util includes
#include <utils/jsonschema/QJsonSchemaChecker.h>
#include <utils/FileUtils.h>
#include <utils/Components.h>

// effect engine includes
#include <effectengine/EffectEngine.h>
#include "Effect.h"
#include "HyperionConfig.h"

EffectEngine::EffectEngine(Hyperion * hyperion, const QJsonObject & jsonEffectConfig)
	: _hyperion(hyperion)
	, _effectConfig(jsonEffectConfig)
	, _availableEffects()
	, _activeEffects()
	, _mainThreadState(nullptr)
	, _log(Logger::getInstance("EFFECTENGINE"))
{
	Q_INIT_RESOURCE(EffectEngine);
	qRegisterMetaType<std::vector<ColorRgb>>("std::vector<ColorRgb>");
	qRegisterMetaType<hyperion::Components>("hyperion::Components");

	// connect the Hyperion channel clear feedback
	connect(_hyperion, SIGNAL(channelCleared(int)), this, SLOT(channelCleared(int)));
	connect(_hyperion, SIGNAL(allChannelsCleared()), this, SLOT(allChannelsCleared()));

	// read all effects
	readEffects();

	// initialize the python interpreter
	Debug(_log,"Initializing Python interpreter");
    Effect::registerHyperionExtensionModule();
	Py_InitializeEx(0);
	PyEval_InitThreads(); // Create the GIL
	_mainThreadState = PyEval_SaveThread();
}

EffectEngine::~EffectEngine()
{
	// clean up the Python interpreter
	Debug(_log, "Cleaning up Python interpreter");
	PyEval_RestoreThread(_mainThreadState);
	Py_Finalize();
}

const std::list<ActiveEffectDefinition> &EffectEngine::getActiveEffects()
{
	_availableActiveEffects.clear();
	
	for (Effect * effect : _activeEffects)
	{
		ActiveEffectDefinition activeEffectDefinition;
		activeEffectDefinition.script = effect->getScript();
		activeEffectDefinition.name = effect->getName();
		activeEffectDefinition.priority = effect->getPriority();
		activeEffectDefinition.timeout = effect->getTimeout();
		activeEffectDefinition.args = effect->getArgs();
		_availableActiveEffects.push_back(activeEffectDefinition);
	}
  
	return _availableActiveEffects;
}

bool EffectEngine::loadEffectDefinition(const QString &path, const QString &effectConfigFile, EffectDefinition & effectDefinition)
{
	Logger * log = Logger::getInstance("EFFECTENGINE");
	
	QString fileName = path + QDir::separator() + effectConfigFile;
	QJsonParseError error;
	
	// ---------- Read the effect json config file ----------
	
	QFile file(fileName);
	if (!file.open(QIODevice::ReadOnly))
	{
		Error( log, "Effect file '%s' could not be loaded", fileName.toUtf8().constData());
		return false;
	}

	QByteArray fileContent = file.readAll();
	QJsonDocument configEffect = QJsonDocument::fromJson(fileContent, &error);
	
	if (error.error != QJsonParseError::NoError)
	{
		// report to the user the failure and their locations in the document.
		int errorLine(0), errorColumn(0);
		
		for( int i=0, count=qMin( error.offset,fileContent.size()); i<count; ++i )
		{
			++errorColumn;
			if(fileContent.at(i) == '\n' )
			{
				errorColumn = 0;
				++errorLine;
			}
		}
		
		Error( log, "Error while reading effect: '%s' at Line: '%i' , Column: %i", error.errorString().toUtf8().constData(), errorLine, errorColumn);
	}
	
	file.close();	

	// ---------- Read the effect json schema file ----------
	
	Q_INIT_RESOURCE(EffectEngine);
	QFile schema(":effect-schema");
	
	if (!schema.open(QIODevice::ReadOnly))
	{
		Error( log, "Schema not found:  %s", schema.errorString().toUtf8().constData());
		return false;
	}
	
	QByteArray schemaContent = schema.readAll();
	QJsonDocument configSchema = QJsonDocument::fromJson(schemaContent, &error);
	
	if (error.error != QJsonParseError::NoError)
	{
		// report to the user the failure and their locations in the document.
		int errorLine(0), errorColumn(0);
		
		for( int i=0, count=qMin( error.offset,schemaContent.size()); i<count; ++i )
		{
			++errorColumn;
			if(schemaContent.at(i) == '\n' )
			{
				errorColumn = 0;
				++errorLine;
			}
		}
		
		Error( log, "ERROR: Json schema wrong: '%s' at Line: '%i' , Column: %i", error.errorString().toUtf8().constData(), errorLine, errorColumn);
	}
	
	schema.close();
	
	// ---------- validate effect config with effect schema ----------
	
	QJsonSchemaChecker schemaChecker;
	schemaChecker.setSchema(configSchema.object());
	if (!schemaChecker.validate(configEffect.object()))
	{
		const std::list<std::string> & errors = schemaChecker.getMessages();
		foreach (const std::string & error, errors)
		{
			Error( log, "Error while checking '%s':%s", fileName.toUtf8().constData(), error.c_str());
		}
		return false;
	}

	// ---------- setup the definition ----------
	
	effectDefinition.file = fileName;
	QJsonObject config = configEffect.object();
	QString scriptName = config["script"].toString();
	effectDefinition.name = config["name"].toString();
	if (scriptName.isEmpty())
		return false;
	
	QFile fileInfo(scriptName);

	if (scriptName.mid(0, 1)  == ":" )
	{
		(!fileInfo.exists())
		? effectDefinition.script = ":/effects/"+scriptName.mid(1)
		: effectDefinition.script = scriptName;
	} else
	{
		(!fileInfo.exists())
		? effectDefinition.script = path + QDir::separator().toLatin1() + scriptName
		: effectDefinition.script = scriptName;
	}
		
	effectDefinition.args = config["args"].toObject();

	return true;
}

bool EffectEngine::loadEffectSchema(const QString &path, const QString &effectSchemaFile, EffectSchema & effectSchema)
{
	Logger * log = Logger::getInstance("EFFECTENGINE");
	
	QString fileName = path + "schema/" + QDir::separator() + effectSchemaFile;
	QJsonParseError error;
	
	// ---------- Read the effect schema file ----------
	
	QFile file(fileName);
	if (!file.open(QIODevice::ReadOnly))
	{
		Error( log, "Effect schema '%s' could not be loaded", fileName.toUtf8().constData());
		return false;
	}

	QByteArray fileContent = file.readAll();
	QJsonDocument schemaEffect = QJsonDocument::fromJson(fileContent, &error);
	
	if (error.error != QJsonParseError::NoError)
	{
		// report to the user the failure and their locations in the document.
		int errorLine(0), errorColumn(0);
		
		for( int i=0, count=qMin( error.offset,fileContent.size()); i<count; ++i )
		{
			++errorColumn;
			if(fileContent.at(i) == '\n' )
			{
				errorColumn = 0;
				++errorLine;
			}
		}
		
		Error( log, "Error while reading effect schema: '%s' at Line: '%i' , Column: %i", error.errorString().toUtf8().constData(), errorLine, errorColumn);
		return false;
	}
	
	file.close();
	
	// ---------- setup the definition ----------
	
	QJsonObject tempSchemaEffect = schemaEffect.object();
	QString scriptName = tempSchemaEffect["script"].toString();
	effectSchema.schemaFile = fileName;
	fileName = path + QDir::separator() + scriptName;
	QFile pyFile(fileName);
	
	if (scriptName.isEmpty() || !pyFile.open(QIODevice::ReadOnly))
	{
		fileName = path + "schema/" + QDir::separator() + effectSchemaFile;
		Error( log, "Python script '%s' in effect schema '%s' could not be loaded", scriptName.toUtf8().constData(), fileName.toUtf8().constData());
		return false;
	}
	
	pyFile.close();

	if (scriptName.mid(0, 1)  == ":" )
		effectSchema.pyFile = ":/effects/"+scriptName.mid(1);
	else
		effectSchema.pyFile = path + QDir::separator().toLatin1() + scriptName;
		
	effectSchema.pySchema = tempSchemaEffect;

	return true;
}

void EffectEngine::readEffects()
{
	// clear all lists
	_availableEffects.clear();
	_effectSchemas.clear();
	
	// read all effects
	const QJsonArray & paths       = _effectConfig["paths"].toArray();
	const QJsonArray & disabledEfx = _effectConfig["disable"].toArray();
	
	QStringList efxPathList;
	efxPathList << ":/effects/";
	QStringList disableList;

	for(auto p : paths)
	{
		efxPathList << p.toString();
	}
	for(auto efx : disabledEfx)
	{
		disableList << efx.toString();
	}

	std::map<QString, EffectDefinition> availableEffects;
	foreach (const QString & path, efxPathList )
	{
		QDir directory(path);
		if (directory.exists())
		{
			int efxCount = 0;
			QStringList filenames = directory.entryList(QStringList() << "*.json", QDir::Files, QDir::Name | QDir::IgnoreCase);
			foreach (const QString & filename, filenames)
			{
				EffectDefinition def;
				if (loadEffectDefinition(path, filename, def))
				{
					if (availableEffects.find(def.name) != availableEffects.end())
					{
						Info(_log, "effect overload effect '%s' is now taken from %s'", def.name.toUtf8().constData(), path.toUtf8().constData() );
					}

					if ( disableList.contains(def.name) )
					{
						Info(_log, "effect '%s' not loaded, because it is disabled in hyperion config", def.name.toUtf8().constData());
					}
					else
					{
						availableEffects[def.name] = def;
						efxCount++;
					}
				}
			}
			Info(_log, "%d effects loaded from directory %s", efxCount, path.toUtf8().constData());
			
			// collect effect schemas
			efxCount = 0;
			directory = path + "schema/";
			QStringList pynames = directory.entryList(QStringList() << "*.json", QDir::Files, QDir::Name | QDir::IgnoreCase);
			foreach (const QString & pyname, pynames)
			{
				EffectSchema pyEffect;
				if (loadEffectSchema(path, pyname, pyEffect))
				{
					_effectSchemas.push_back(pyEffect);
					efxCount++;
				}
			}
			if (efxCount > 0)
				Info(_log, "%d effect schemas loaded from directory %s", efxCount, (path + "schema/").toUtf8().constData());
		}
		else
		{
			Warning(_log, "Effect path \"%s\" does not exist",path.toUtf8().constData() );
		}
	}

	foreach(auto item,  availableEffects)
	{
		_availableEffects.push_back(item.second);
	}
	
	if (_availableEffects.size() == 0)
	{
		Error(_log, "no effects found, check your effect directories");
	}
}

int EffectEngine::runEffect(const QString &effectName, const QJsonObject &args, int priority, int timeout, QString pythonScript, const QString origin)
{
	Info( _log, "run effect %s on channel %d", effectName.toUtf8().constData(), priority);

	if (pythonScript == "")
	{
		const EffectDefinition * effectDefinition = nullptr;
		for (const EffectDefinition & e : _availableEffects)
		{
			if (e.name == effectName)
			{
				effectDefinition = &e;
				break;
			}
		}
		if (effectDefinition == nullptr)
		{
			// no such effect
			Error(_log, "effect %s not found",  effectName.toUtf8().constData());
			return -1;
		}

		return runEffectScript(effectDefinition->script, effectName, args.isEmpty() ? effectDefinition->args : args, priority, timeout, origin);
	} else
		return runEffectScript(pythonScript, effectName, args, priority, timeout, origin);
}

int EffectEngine::runEffectScript(const QString &script, const QString &name, const QJsonObject &args, int priority, int timeout, const QString origin)
{
	// clear current effect on the channel
	channelCleared(priority);

	// create the effect
    Effect * effect = new Effect(_mainThreadState, priority, timeout, script, name, args);
	connect(effect, SIGNAL(setColors(int,std::vector<ColorRgb>,int,bool,hyperion::Components)), _hyperion, SLOT(setColors(int,std::vector<ColorRgb>,int,bool,hyperion::Components)), Qt::QueuedConnection);
	connect(effect, SIGNAL(effectFinished(Effect*)), this, SLOT(effectFinished(Effect*)));
	_activeEffects.push_back(effect);

	// start the effect
	_hyperion->registerPriority(name.toStdString(), priority, origin);
	effect->start();

	return 0;
}

void EffectEngine::channelCleared(int priority)
{
	for (Effect * effect : _activeEffects)
	{
		if (effect->getPriority() == priority)
		{
			effect->abort();
		}
	}
}

void EffectEngine::allChannelsCleared()
{
	for (Effect * effect : _activeEffects)
	{
		effect->abort();
	}
}

void EffectEngine::effectFinished(Effect *effect)
{
	if (!effect->isAbortRequested())
	{
		// effect stopped by itself. Clear the channel
		_hyperion->clear(effect->getPriority());
	}

	Info( _log, "effect finished");
	for (auto effectIt = _activeEffects.begin(); effectIt != _activeEffects.end(); ++effectIt)
	{
		if (*effectIt == effect)
		{
			_activeEffects.erase(effectIt);
			break;
		}
	}

	// cleanup the effect
	effect->deleteLater();
	_hyperion->unRegisterPriority(effect->getName().toStdString());
}