/*
 * Cantata
 *
 * Copyright (c) 2011-2014 Craig Drummond <craig.p.drummond@gmail.com>
 *
 */
/*
 * Copyright (c) 2008 Sander Knopper (sander AT knopper DOT tk) and
 *                    Roeland Douma (roeland AT rullzer DOT com)
 *
 * This file is part of QtMPC.
 *
 * QtMPC 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 2 of the License, or
 * (at your option) any later version.
 *
 * QtMPC 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 QtMPC.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "musiclibrarymodel.h"
#include "gui/settings.h"
#include "musiclibraryitemalbum.h"
#include "musiclibraryitemartist.h"
#include "musiclibraryitemroot.h"
#include "musiclibraryitemsong.h"
#include "roles.h"
#include "support/utils.h"
#include "widgets/icons.h"
#include <QDateTime>
#include <QDir>
#include <QFile>
#include <QMimeData>
#include <QStringList>
#include <QStringView>
#include <QTimer>

MusicLibraryModel::MusicLibraryModel(QObject* parent)
	: ActionModel(parent), rootItem(new MusicLibraryItemRoot)
{
	rootItem->setModel(this);
}

MusicLibraryModel::~MusicLibraryModel()
{
	delete rootItem;
}

QModelIndex MusicLibraryModel::index(int row, int column, const QModelIndex& parent) const
{
	if (!hasIndex(row, column, parent)) {
		return QModelIndex();
	}

	const MusicLibraryItem* parentItem;

	if (!parent.isValid()) {
		parentItem = rootItem;
	}
	else {
		parentItem = static_cast<MusicLibraryItem*>(parent.internalPointer());
	}

	MusicLibraryItem* const childItem = parentItem->childItem(row);
	if (childItem) {
		return createIndex(row, column, childItem);
	}

	return QModelIndex();
}

QModelIndex MusicLibraryModel::parent(const QModelIndex& index) const
{
	if (!index.isValid()) {
		return QModelIndex();
	}

	const MusicLibraryItem* const childItem = static_cast<MusicLibraryItem*>(index.internalPointer());
	MusicLibraryItem* const parentItem = childItem->parentItem();

	if (parentItem == rootItem) {
		return QModelIndex();
	}

	return createIndex(parentItem->row(), 0, parentItem);
}

int MusicLibraryModel::rowCount(const QModelIndex& parent) const
{
	if (parent.column() > 0) {
		return 0;
	}

	const MusicLibraryItem* parentItem;

	if (!parent.isValid()) {
		parentItem = rootItem;
	}
	else {
		parentItem = static_cast<MusicLibraryItem*>(parent.internalPointer());
	}

	return parentItem->childCount();
}

const MusicLibraryItemRoot* MusicLibraryModel::root(const MusicLibraryItem* item) const
{
	if (MusicLibraryItem::Type_Root == item->itemType()) {
		return static_cast<const MusicLibraryItemRoot*>(item);
	}

	if (MusicLibraryItem::Type_Artist == item->itemType()) {
		return static_cast<const MusicLibraryItemRoot*>(item->parentItem());
	}

	if (MusicLibraryItem::Type_Album == item->itemType()) {
		return static_cast<const MusicLibraryItemRoot*>(item->parentItem()->parentItem());
	}

	if (MusicLibraryItem::Type_Song == item->itemType()) {
		return root(item->parentItem());
	}

	return nullptr;
}

static QString parentData(const MusicLibraryItem* i)
{
	QString data;
	const MusicLibraryItem* itm = i;

	while (itm->parentItem()) {
		if (!itm->parentItem()->data().isEmpty()) {
			if (MusicLibraryItem::Type_Root == itm->parentItem()->itemType()) {
				data = "<b>" + itm->parentItem()->data() + "</b><br/>" + data;
			}
			else {
				data = itm->parentItem()->data() + "<br/>" + data;
			}
		}
		itm = itm->parentItem();
	}

	return data;
}

QVariant MusicLibraryModel::data(const QModelIndex& index, int role) const
{
	if (!index.isValid()) {
		return QVariant();
	}

	if (Qt::CheckStateRole == role) {
		return static_cast<MusicLibraryItem*>(index.internalPointer())->checkState();
	}

	MusicLibraryItem* item = static_cast<MusicLibraryItem*>(index.internalPointer());

	switch (role) {
	case Qt::DecorationRole:
		switch (item->itemType()) {
		case MusicLibraryItem::Type_Root:
			return static_cast<MusicLibraryItemRoot*>(item)->icon();
		case MusicLibraryItem::Type_Artist:
			return Icons::self()->artistIcon;
		case MusicLibraryItem::Type_Album:
			return Icons::self()->albumIcon(32, true);
		case MusicLibraryItem::Type_Song:
			return Song::Playlist == static_cast<MusicLibraryItemSong*>(item)->song().type ? Icons::self()->playlistListIcon : Icons::self()->audioListIcon;
		default:
			return QVariant();
		}
	case Cantata::Role_BriefMainText:
		if (MusicLibraryItem::Type_Album == item->itemType()) {
			return item->data();
		}
		break;
	case Cantata::Role_MainText:
	case Qt::DisplayRole:
		if (MusicLibraryItem::Type_Song == item->itemType()) {
			MusicLibraryItemSong* song = static_cast<MusicLibraryItemSong*>(item);
			if (Song::Playlist == song->song().type) {
				return song->song().isCueFile() ? tr("Cue Sheet") : tr("Playlist");
			}
			if (MusicLibraryItem::Type_Root == song->parentItem()->itemType()) {
				return song->song().trackAndTitleStr();
			}
			return song->song().trackAndTitleStr();
		}
		return item->displayData();
	case Qt::ToolTipRole:
		if (!Settings::self()->infoTooltips()) {
			return QVariant();
		}
		if (MusicLibraryItem::Type_Song == item->itemType()) {
			return static_cast<MusicLibraryItemSong*>(item)->song().toolTip();
		}

		return parentData(item) + (0 == item->childCount() ? item->displayData(true) : (item->displayData(true) + "<br/>" + data(index, Cantata::Role_SubText).toString()));
	case Cantata::Role_SubText:
		switch (item->itemType()) {
		case MusicLibraryItem::Type_Root: {
			MusicLibraryItemRoot* collection = static_cast<MusicLibraryItemRoot*>(item);

			if (collection->flat()) {
				return tr("%n Track(s)", "", item->childCount());
			}
			return tr("%n Artist(s)", "", item->childCount());
		}
		case MusicLibraryItem::Type_Artist:
			return tr("%n Album(s)", "", item->childCount());
		case MusicLibraryItem::Type_Song:
			return Utils::formatTime(static_cast<MusicLibraryItemSong*>(item)->time(), true);
		case MusicLibraryItem::Type_Album:
			return tr("%n Tracks (%1)", "", static_cast<MusicLibraryItemAlbum*>(item)->trackCount())
					.arg(Utils::formatTime(static_cast<MusicLibraryItemAlbum*>(item)->totalTime()));
		default: return QVariant();
		}
	case Cantata::Role_ListImage:
		switch (item->itemType()) {
		case MusicLibraryItem::Type_Album:
			return true;
		default:
			return false;
		}
	case Cantata::Role_CoverSong: {
		QVariant v;
		switch (item->itemType()) {
		case MusicLibraryItem::Type_Album:
			v.setValue<Song>(static_cast<MusicLibraryItemAlbum*>(item)->coverSong());
			break;
		case MusicLibraryItem::Type_Artist:
			v.setValue<Song>(static_cast<MusicLibraryItemArtist*>(item)->coverSong());
			break;
		default:
			break;
		}
		return v;
	}
	case Cantata::Role_TitleText:
		if (MusicLibraryItem::Type_Album == item->itemType()) {
			return tr("%1 by %2", "Album by Artist").arg(item->data()).arg(item->parentItem()->data());
		}
		return item->data();
	default:
		break;
	}
	return ActionModel::data(index, role);
}

bool MusicLibraryModel::setData(const QModelIndex& idx, const QVariant& value, int role)
{
	if (Qt::CheckStateRole == role) {
		if (!idx.isValid()) {
			return false;
		}

		MusicLibraryItem* item = static_cast<MusicLibraryItem*>(idx.internalPointer());
		Qt::CheckState check = value.toBool() ? Qt::Checked : Qt::Unchecked;

		if (item->checkState() == check) {
			return false;
		}

		switch (item->itemType()) {
		case MusicLibraryItem::Type_Artist: {
			MusicLibraryItemArtist* artistItem = static_cast<MusicLibraryItemArtist*>(item);
			QModelIndex artistIndex = index(artistItem->row(), 0, QModelIndex());
			item->setCheckState(check);
			for (MusicLibraryItem* album : artistItem->childItems()) {
				if (check != album->checkState()) {
					MusicLibraryItemAlbum* albumItem = static_cast<MusicLibraryItemAlbum*>(album);
					QModelIndex albumIndex = index(albumItem->row(), 0, artistIndex);
					album->setCheckState(check);
					for (MusicLibraryItem* song : albumItem->childItems()) {
						song->setCheckState(check);
					}
					emit dataChanged(index(0, 0, albumIndex), index(0, albumItem->childCount(), albumIndex));
				}
				emit dataChanged(index(0, 0, artistIndex), index(0, artistItem->childCount(), artistIndex));
			}
			emit dataChanged(idx, idx);
			break;
		}
		case MusicLibraryItem::Type_Album: {
			MusicLibraryItemArtist* artistItem = static_cast<MusicLibraryItemArtist*>(item->parentItem());
			MusicLibraryItemAlbum* albumItem = static_cast<MusicLibraryItemAlbum*>(item);
			QModelIndex artistIndex = index(artistItem->row(), 0, QModelIndex());
			item->setCheckState(check);
			for (MusicLibraryItem* song : albumItem->childItems()) {
				song->setCheckState(check);
			}
			setParentState(artistIndex);
			emit dataChanged(idx, idx);
			break;
		}
		case MusicLibraryItem::Type_Song: {
			item->setCheckState(check);
			MusicLibraryItemAlbum* albumItem = static_cast<MusicLibraryItemAlbum*>(item->parentItem());
			MusicLibraryItemArtist* artistItem = static_cast<MusicLibraryItemArtist*>(albumItem->parentItem());
			QModelIndex artistIndex = index(artistItem->row(), 0, QModelIndex());
			QModelIndex albumIndex = index(albumItem->row(), 0, artistIndex);
			setParentState(albumIndex);
			setParentState(artistIndex);
			emit dataChanged(idx, idx);
			break;
		}
		case MusicLibraryItem::Type_Root:
			return false;
		}

		return true;
	}
	return ActionModel::setData(idx, value, role);
}

void MusicLibraryModel::setParentState(const QModelIndex& parent)
{
	MusicLibraryItemContainer* parentItem = static_cast<MusicLibraryItemContainer*>(parent.internalPointer());
	Qt::CheckState parentCheck = parentItem->checkState();
	bool haveCheckedChildren = false;
	bool haveUncheckedChildren = false;
	bool stop = false;

	for (MusicLibraryItem* child : parentItem->childItems()) {
		switch (child->checkState()) {
		case Qt::PartiallyChecked:
			parentCheck = Qt::PartiallyChecked;
			stop = true;
			break;
		case Qt::Unchecked:
			haveUncheckedChildren = true;
			parentCheck = haveCheckedChildren ? Qt::PartiallyChecked : Qt::Unchecked;
			stop = haveCheckedChildren && haveUncheckedChildren;
			break;
		case Qt::Checked:
			haveCheckedChildren = true;
			parentCheck = haveUncheckedChildren ? Qt::PartiallyChecked : Qt::Checked;
			stop = haveCheckedChildren && haveUncheckedChildren;
			break;
		}
		if (stop) {
			break;
		}
	}

	if (parentItem->checkState() != parentCheck) {
		parentItem->setCheckState(parentCheck);
		emit dataChanged(parent, parent);
	}
}

void MusicLibraryModel::clear()
{
	beginResetModel();
	rootItem->clear();
	endResetModel();
}

void MusicLibraryModel::setSongs(const QSet<Song>& songs)
{
	rootItem->update(songs);
	//    for (MusicLibraryItem *artist: rootItem->childItems()) {
	//        MusicLibraryItemArtist *artistItem=static_cast<MusicLibraryItemArtist *>(artist);
	//        artistItem->setCheckState(Qt::Checked);

	//        for (MusicLibraryItem *album: artistItem->childItems()) {
	//            MusicLibraryItemAlbum *albumItem=static_cast<MusicLibraryItemAlbum *>(album);
	//            albumItem->setCheckState(Qt::Checked);
	//            for (MusicLibraryItem *song: albumItem->childItems()) {
	//                song->setCheckState(Qt::Checked);
	//            }
	//        }
	//    }
}

Qt::ItemFlags MusicLibraryModel::flags(const QModelIndex& index) const
{
	if (index.isValid()) {
		return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
	}
	return Qt::ItemIsDropEnabled;
}

#include "moc_musiclibrarymodel.cpp"