/*
 * Olive Community Edition - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "project.h"

#include <QDir>
#include <QFileInfo>

#include "common/qtutils.h"
#include "common/xmlutils.h"
#include "core.h"
#include "dialog/progress/progress.h"
#include "node/color/ociobase/ociobase.h"
#include "node/factory.h"
#include "node/serializeddata.h"
#include "render/diskmanager.h"
#include "window/mainwindow/mainwindow.h"

namespace olive
{

#define super QObject

const QString Project::kCacheLocationSettingKey =
	QStringLiteral("cachesetting");
const QString Project::kCachePathKey = QStringLiteral("customcachepath");
const QString Project::kColorConfigFilename =
	QStringLiteral("colorconfigfilename");
const QString Project::kDefaultInputColorSpaceKey =
	QStringLiteral("defaultinputcolorspace");
const QString Project::kColorReferenceSpace =
	QStringLiteral("colorreferencespace");
const QString Project::kRootKey = QStringLiteral("root");

const QString Project::kItemMimeType =
	QStringLiteral("application/x-oliveprojectitemdata");

Project::Project()
	: root_(nullptr)
	, is_modified_(false)
	, autorecovery_saved_(true)
{
	// Generate UUID for this project
	RegenerateUuid();

	// Initialize color manager
	color_manager_ = new ColorManager(this);
	color_manager_->Init();
}

Project::~Project()
{
	Clear();
}

void Project::Initialize()
{
	if (!root_) {
		root_ = new Folder();
		root_->setParent(this);
		root_->SetLabel(tr("Root"));
		settings_.insert(kRootKey,
						 QString::number(reinterpret_cast<quintptr>(root_)));
	}
}

void Project::Clear()
{
	// By deleting the last nodes first, we assume that nodes that are most important are deleted last
	// (e.g. Project's ColorManager or ProjectSettingsNode.
	for (auto it = node_children_.cbegin(); it != node_children_.cend(); it++) {
		(*it)->SetCachesEnabled(false);
	}

	while (!node_children_.isEmpty()) {
		delete node_children_.last();
	}
}

SerializedData Project::Load(QXmlStreamReader *reader)
{
	SerializedData data;

	while (XMLReadNextStartElement(reader)) {
		if (reader->name() == QStringLiteral("uuid")) {
			this->SetUuid(QUuid::fromString(reader->readElementText()));

		} else if (reader->name() == QStringLiteral("nodes")) {
			while (XMLReadNextStartElement(reader)) {
				if (reader->name() == QStringLiteral("node")) {
					QString id;

					{
						XMLAttributeLoop(reader, attr)
						{
							if (attr.name() == QStringLiteral("id")) {
								id = attr.value().toString();
							}
						}
					}

					if (id.isEmpty()) {
						qWarning() << "Failed to load node with empty ID";
						reader->skipCurrentElement();
					} else {
						Node *node = NodeFactory::CreateFromID(id);

						if (!node) {
							qWarning() << "Failed to find node with ID" << id;
							reader->skipCurrentElement();
						} else {
							// Disable cache while node is being loaded (we'll re-enable it later)
							node->SetCachesEnabled(false);

							node->Load(reader, &data);

							node->setParent(this);
						}
					}
				} else {
					reader->skipCurrentElement();
				}
			}

		} else if (reader->name() == QStringLiteral("settings")) {
			while (XMLReadNextStartElement(reader)) {
				QString key = reader->name().toString();
				QString val = reader->readElementText();
				SetSetting(key, val);
			}
		} else {
			// Skip this
			reader->skipCurrentElement();
		}
	}

	// Resolve root if applicable
	QString root = GetSetting(kRootKey);
	if (!root.isEmpty()) {
		quintptr r = root.toULongLong();
		if (Node *n = data.node_ptrs.value(r)) {
			Q_ASSERT(!root_);
			root_ = dynamic_cast<Folder *>(n);
			SetSetting(kRootKey,
					   QString::number(reinterpret_cast<quintptr>(root_)));
		}
	}

	return data;
}

void Project::Save(QXmlStreamWriter *writer) const
{
	writer->writeAttribute(QStringLiteral("version"), QString::number(1));

	writer->writeTextElement(QStringLiteral("uuid"),
							 this->GetUuid().toString());

	if (!this->nodes().isEmpty()) {
		writer->writeStartElement(QStringLiteral("nodes"));

		foreach (Node *node, this->nodes()) {
			writer->writeStartElement(QStringLiteral("node"));

			node->Save(writer);

			writer->writeEndElement(); // node
		}

		writer->writeEndElement(); // nodes
	}

	if (!this->settings_.isEmpty()) {
		writer->writeStartElement(QStringLiteral("settings"));

		for (auto it = this->settings_.cbegin(); it != this->settings_.cend();
			 it++) {
			writer->writeTextElement(it.key(), it.value());
		}

		writer->writeEndElement(); // settings
	}
}

int Project::GetNumberOfContextsNodeIsIn(Node *node, bool except_itself) const
{
	int count = 0;

	foreach (Node *ctx, node_children_) {
		if (ctx->ContextContainsNode(node) && (!except_itself || ctx != node)) {
			count++;
		}
	}

	return count;
}

void Project::childEvent(QChildEvent *event)
{
	super::childEvent(event);

	Node *node = dynamic_cast<Node *>(event->child());

	if (node) {
		if (event->type() == QEvent::ChildAdded) {
			node_children_.append(node);

			// Connect signals
			connect(node, &Node::InputConnected, this, &Project::InputConnected,
					Qt::DirectConnection);
			connect(node, &Node::InputDisconnected, this,
					&Project::InputDisconnected, Qt::DirectConnection);
			connect(node, &Node::ValueChanged, this, &Project::ValueChanged,
					Qt::DirectConnection);
			connect(node, &Node::InputValueHintChanged, this,
					&Project::InputValueHintChanged, Qt::DirectConnection);

			if (NodeGroup *group = dynamic_cast<NodeGroup *>(node)) {
				connect(group, &NodeGroup::InputPassthroughAdded, this,
						&Project::GroupAddedInputPassthrough,
						Qt::DirectConnection);
				connect(group, &NodeGroup::InputPassthroughRemoved, this,
						&Project::GroupRemovedInputPassthrough,
						Qt::DirectConnection);
				connect(group, &NodeGroup::OutputPassthroughChanged, this,
						&Project::GroupChangedOutputPassthrough,
						Qt::DirectConnection);
			}

			emit NodeAdded(node);
			emit node->AddedToGraph(this);
			node->AddedToGraphEvent(this);

			// Emit input connections
			for (auto it = node->input_connections().cbegin();
				 it != node->input_connections().cend(); it++) {
				if (nodes().contains(it->second)) {
					emit InputConnected(it->second, it->first);
				}
			}

			// Emit output connections
			for (auto it = node->output_connections().cbegin();
				 it != node->output_connections().cend(); it++) {
				if (nodes().contains(it->second.node())) {
					emit InputConnected(it->first, it->second);
				}
			}

		} else if (event->type() == QEvent::ChildRemoved) {
			node_children_.removeOne(node);

			// Disconnect signals
			disconnect(node, &Node::InputConnected, this,
					   &Project::InputConnected);
			disconnect(node, &Node::InputDisconnected, this,
					   &Project::InputDisconnected);
			disconnect(node, &Node::ValueChanged, this, &Project::ValueChanged);
			disconnect(node, &Node::InputValueHintChanged, this,
					   &Project::InputValueHintChanged);

			if (NodeGroup *group = dynamic_cast<NodeGroup *>(node)) {
				disconnect(group, &NodeGroup::InputPassthroughAdded, this,
						   &Project::GroupAddedInputPassthrough);
				disconnect(group, &NodeGroup::InputPassthroughRemoved, this,
						   &Project::GroupRemovedInputPassthrough);
				disconnect(group, &NodeGroup::OutputPassthroughChanged, this,
						   &Project::GroupChangedOutputPassthrough);
			}

			emit NodeRemoved(node);
			emit node->RemovedFromGraph(this);
			node->RemovedFromGraphEvent(this);

			// Remove from any contexts
			foreach (Node *context, node_children_) {
				context->RemoveNodeFromContext(node);
			}
		}
	}
}

QString Project::name() const
{
	if (filename_.isEmpty()) {
		return tr("(untitled)");
	} else {
		return QFileInfo(filename_).completeBaseName();
	}
}

const QString &Project::filename() const
{
	return filename_;
}

QString Project::pretty_filename() const
{
	QString fn = filename();

	if (fn.isEmpty()) {
		return tr("(untitled)");
	} else {
		return fn;
	}
}

void Project::set_filename(const QString &s)
{
	filename_ = s;

#ifdef Q_OS_WINDOWS
	// Prevents filenames
	filename_.replace('/', '\\');
#endif

	emit NameChanged();
}

void Project::set_modified(bool e)
{
	is_modified_ = e;
	set_autorecovery_saved(!e);

	emit ModifiedChanged(is_modified_);
}

bool Project::has_autorecovery_been_saved() const
{
	return autorecovery_saved_;
}

void Project::set_autorecovery_saved(bool e)
{
	autorecovery_saved_ = e;
}

bool Project::is_new() const
{
	return !is_modified_ && filename_.isEmpty();
}

QString Project::get_cache_alongside_project_path() const
{
	if (!filename_.isEmpty()) {
		// Non-translated string so the path doesn't change if the language does
		return QFileInfo(filename_).dir().filePath(QStringLiteral("cache"));
	}
	return QString();
}

QString Project::cache_path() const
{
	CacheSetting setting = GetCacheLocationSetting();

	switch (setting) {
	case kCacheUseDefaultLocation:
		break;
	case kCacheCustomPath: {
		QString cache_path = GetCustomCachePath();
		if (cache_path.isEmpty()) {
			return cache_path;
		}
		break;
	}
	case kCacheStoreAlongsideProject: {
		QString alongside = get_cache_alongside_project_path();
		if (!alongside.isEmpty()) {
			return alongside;
		}
		break;
	}
	}

	return DiskManager::instance()->GetDefaultCachePath();
}

void Project::RegenerateUuid()
{
	uuid_ = QUuid::createUuid();
}

Project *Project::GetProjectFromObject(const QObject *o)
{
	return QtUtils::GetParentOfType<Project>(o);
}

void Project::SetSetting(const QString &key, const QString &value)
{
	settings_.insert(key, value);
	emit SettingChanged(key, value);

	if (key == kColorReferenceSpace) {
		emit color_manager_->ReferenceSpaceChanged(value);
	} else if (key == kColorConfigFilename) {
		color_manager_->UpdateConfigFromFilename();
	} else if (key == kDefaultInputColorSpaceKey) {
		emit color_manager_->DefaultInputChanged(value);
	}
}

}