#include "./syncthingdownloadmodel.h"

#include "../connector/syncthingconnection.h"
#include "../connector/utils.h"

#include <QStringBuilder>

using namespace ChronoUtilities;

namespace Data {

SyncthingDownloadModel::SyncthingDownloadModel(SyncthingConnection &connection, QObject *parent)
    : SyncthingModel(connection, parent)
    , m_dirs(connection.dirInfo())
    , m_unknownIcon(
          QIcon::fromTheme(QStringLiteral("text-x-generic"), QIcon(QStringLiteral(":/icons/hicolor/scalable/mimetypes/text-x-generic.svg"))))
    , m_pendingDirs(0)
    , m_singleColumnMode(true)
{
    connect(&m_connection, &SyncthingConnection::newConfig, this, &SyncthingDownloadModel::newConfig);
    connect(&m_connection, &SyncthingConnection::newDirs, this, &SyncthingDownloadModel::newDirs);
    connect(&m_connection, &SyncthingConnection::downloadProgressChanged, this, &SyncthingDownloadModel::downloadProgressChanged);
}

QHash<int, QByteArray> SyncthingDownloadModel::initRoleNames()
{
    QHash<int, QByteArray> roles;
    roles[Qt::DisplayRole] = "name";
    roles[Qt::DecorationRole] = "fileIcon";
    roles[ItemPercentage] = "percentage";
    roles[ItemProgressLabel] = "progressLabel";
    return roles;
}

QHash<int, QByteArray> SyncthingDownloadModel::roleNames() const
{
    const static QHash<int, QByteArray> roles(initRoleNames());
    return roles;
}

/*!
 * \brief Returns the directory info for the spcified \a index. The returned object is not persistent.
 */
const SyncthingDir *SyncthingDownloadModel::dirInfo(const QModelIndex &index) const
{
    return (index.parent().isValid()
            ? dirInfo(index.parent())
            : (static_cast<size_t>(index.row()) < m_pendingDirs.size() ? m_pendingDirs[static_cast<size_t>(index.row())] : nullptr));
}

const SyncthingItemDownloadProgress *SyncthingDownloadModel::progressInfo(const QModelIndex &index) const
{
    if (index.parent().isValid() && static_cast<size_t>(index.parent().row()) < m_pendingDirs.size()
        && static_cast<size_t>(index.row()) < m_pendingDirs[static_cast<size_t>(index.parent().row())]->downloadingItems.size()) {
        return &(m_pendingDirs[static_cast<size_t>(index.parent().row())]->downloadingItems[static_cast<size_t>(index.row())]);
    } else {
        return nullptr;
    }
}

QModelIndex SyncthingDownloadModel::index(int row, int column, const QModelIndex &parent) const
{
    if (!parent.isValid()) {
        // top-level: all pending dir labels/IDs
        if (row < rowCount(parent)) {
            return createIndex(row, column, static_cast<quintptr>(-1));
        }
    } else if (!parent.parent().isValid()) {
        // dir-level: pending downloads
        if (row < rowCount(parent)) {
            return createIndex(row, column, static_cast<quintptr>(parent.row()));
        }
    }
    return QModelIndex();
}

QModelIndex SyncthingDownloadModel::parent(const QModelIndex &child) const
{
    return child.internalId() != static_cast<quintptr>(-1) ? index(static_cast<int>(child.internalId()), 0, QModelIndex()) : QModelIndex();
}

QVariant SyncthingDownloadModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    switch (orientation) {
    case Qt::Horizontal:
        switch (role) {
        case Qt::DisplayRole:
            switch (section) {
            case 0:
                return tr("Dir/item");
            case 1:
                return tr("Progress");
            }
            break;
        default:;
        }
        break;
    default:;
    }
    return QVariant();
}

QVariant SyncthingDownloadModel::data(const QModelIndex &index, int role) const
{
    if (index.isValid()) {
        if (index.parent().isValid()) {
            // downloading items (of dir)
            if (static_cast<size_t>(index.parent().row()) < m_pendingDirs.size()) {
                const SyncthingDir &dir = *m_pendingDirs[static_cast<size_t>(index.parent().row())];
                if (static_cast<size_t>(index.row()) < dir.downloadingItems.size()) {
                    const SyncthingItemDownloadProgress &progress = dir.downloadingItems[static_cast<size_t>(index.row())];
                    switch (role) {
                    case Qt::DisplayRole:
                    case Qt::EditRole:
                        switch (index.column()) {
                        case 0: // file names
                            return progress.relativePath;
                        case 1: // progress information
                            return progress.label;
                        }
                        break;
                    case Qt::ToolTipRole:
                        break;
                    case Qt::DecorationRole:
                        switch (index.column()) {
                        case 0: // file icon
                            return progress.fileInfo.exists() ? m_fileIconProvider.icon(progress.fileInfo) : m_unknownIcon;
                        default:;
                        }
                        break;
                    case ItemPercentage:
                        return progress.downloadPercentage;
                    case ItemProgressLabel:
                        return progress.label;
                    default:;
                    }
                }
            }
        } else if (static_cast<size_t>(index.row()) < m_pendingDirs.size()) {
            // dir IDs and overall dir progress
            const SyncthingDir &dir = *m_pendingDirs[static_cast<size_t>(index.row())];
            switch (role) {
            case Qt::DisplayRole:
            case Qt::EditRole:
                switch (index.column()) {
                case 0:
                    return QVariant((dir.label.isEmpty() ? dir.id : dir.label) % QChar(' ') % QChar('(')
                        % QString::number(dir.downloadingItems.size()) % QChar(')'));
                case 1:
                    return dir.downloadLabel;
                }
                break;
            case Qt::TextAlignmentRole:
                switch (index.column()) {
                case 0:
                    break;
                case 1:
                    return static_cast<int>(Qt::AlignRight | Qt::AlignVCenter);
                }
                break;
            case ItemPercentage:
                return dir.downloadPercentage;
            case ItemProgressLabel:
                return dir.downloadLabel;
            default:;
            }
        }
    }
    return QVariant();
}

bool SyncthingDownloadModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    Q_UNUSED(index) Q_UNUSED(value) Q_UNUSED(role) return false;
}

int SyncthingDownloadModel::rowCount(const QModelIndex &parent) const
{
    if (!parent.isValid()) {
        return static_cast<int>(m_pendingDirs.size());
    } else if (!parent.parent().isValid() && parent.row() >= 0 && static_cast<size_t>(parent.row()) < m_pendingDirs.size()) {
        return static_cast<int>(m_pendingDirs[static_cast<size_t>(parent.row())]->downloadingItems.size());
    } else {
        return 0;
    }
}

int SyncthingDownloadModel::columnCount(const QModelIndex &parent) const
{
    if (!parent.isValid()) {
        return singleColumnMode() ? 1 : 2; // label/ID, status/progress
    } else if (!parent.parent().isValid()) {
        return singleColumnMode() ? 1 : 2; // file, progress
    } else {
        return 0;
    }
}

void SyncthingDownloadModel::newConfig()
{
    beginResetModel();
    m_pendingDirs.clear();
    endResetModel();
}

void SyncthingDownloadModel::newDirs()
{
    m_pendingDirs.reserve(m_connection.dirInfo().size());
}

void SyncthingDownloadModel::downloadProgressChanged()
{
    int row = 0;
    for (const SyncthingDir &dirInfo : m_connection.dirInfo()) {
        const auto pendingIterator = find(m_pendingDirs.begin(), m_pendingDirs.end(), &dirInfo);
        if (dirInfo.downloadingItems.empty()) {
            if (pendingIterator != m_pendingDirs.end()) {
                beginRemoveRows(QModelIndex(), row, row);
                m_pendingDirs.erase(pendingIterator);
                endRemoveRows();
            }
        } else {
            if (pendingIterator != m_pendingDirs.end()) {
                static const QVector<int> roles(
                    { Qt::DisplayRole, Qt::EditRole, Qt::DecorationRole, Qt::ForegroundRole, Qt::ToolTipRole, ItemPercentage, ItemProgressLabel });
                const QModelIndex parentIndex(index(row, 0));
                emit dataChanged(parentIndex, index(row, 1), roles);
                emit dataChanged(index(0, 0, parentIndex), index(static_cast<int>(dirInfo.downloadingItems.size()), 1, parentIndex), roles);
            } else {
                beginInsertRows(QModelIndex(), row, row);
                beginInsertRows(index(row, row), 0, static_cast<int>(dirInfo.downloadingItems.size()));
                m_pendingDirs.insert(pendingIterator, &dirInfo);
                endInsertRows();
                endInsertRows();
            }
            ++row;
        }
    }
}

void SyncthingDownloadModel::setSingleColumnMode(bool singleColumnModeEnabled)
{
    if (m_singleColumnMode != singleColumnModeEnabled) {
        if (m_singleColumnMode) {
            beginInsertColumns(QModelIndex(), 1, 1);
            m_singleColumnMode = true;
            endInsertColumns();
        } else {
            beginRemoveColumns(QModelIndex(), 1, 1);
            m_singleColumnMode = false;
            endRemoveColumns();
        }
    }
}

} // namespace Data