#include "sessiontreemodel.h"

#include <QFileInfo>
#include <QIcon>
#include <QResource>
#include <QString>

#include "sessiontreeitem.h"

SessionTreeModel::SessionTreeModel(QObject *parent)
    : QAbstractItemModel(parent) {
    root_ = new SessionTreeItem("dummy");
}

SessionTreeModel::~SessionTreeModel() {
    delete root_;
}

int SessionTreeModel::columnCount(const QModelIndex& /*parent*/) const {
    return 1;
}

int SessionTreeModel::rowCount(const QModelIndex &parent) const {
    SessionTreeItem* parentItem;
    if (parent.column() > 0) {
        return 0;
    }

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

    return parentItem->childCount();
}

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

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

    const Session* s = item->session();
    if (s) {
        if (role == Qt::DisplayRole)
            return s->shortDescription();
        if (role == Qt::ToolTipRole)
            return s->description();
        if (role == Qt::DecorationRole) {
            // TODO: use cache for icons
            if (index.column() == 0) { // TODO: is this line needed?
                QString icon(s->icon());

                if (QFileInfo(icon).isAbsolute()) {
                    // try to load icon from file
                    return QIcon(icon);
                } else {
                    // try to load icon from QResource
                    if (QResource(":" + icon.toLower() + ".svg").isValid()) {
                        return QIcon(":" + icon.toLower() + ".svg");
                    } else if (QResource(":" + icon.toLower()).isValid()) {
                        return QIcon(":" + icon.toLower());
                    } else {
                        return QIcon(":none");
                    }
                }
            }
        }
    } else if (role == Qt::DisplayRole) {
        // this is a section item (X Sessions / Virtual Sessions)
        return item->text();
    }

    return QVariant();
}

Qt::ItemFlags SessionTreeModel::flags(const QModelIndex &index) const {
    if (!index.isValid()) {
        return 0;
    }

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

    if (item->session()) {
        return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
    } else {
        return Qt::ItemIsEnabled;
    }
}

QVariant SessionTreeModel::headerData(int /*section*/,
                                      Qt::Orientation /*orientation*/,
                                      int /*role*/) const {
    return QVariant();
}

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

    SessionTreeItem *parentItem;

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

    SessionTreeItem *childItem = parentItem->child(row);
    if (childItem) {
        return createIndex(row, column, childItem);
    } else {
        return QModelIndex();
    }
}

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

    SessionTreeItem *childItem =
            static_cast<SessionTreeItem*>(index.internalPointer());
    SessionTreeItem *parentItem = childItem->parent();

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

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

void SessionTreeModel::addItems(const QList<Session*>& sessions,
                                const QString& section) {
    SessionTreeItem* parentItem;

    bool sectionExists = false;

    for (int i = 0; i < root_->childCount(); ++i) {
        SessionTreeItem* item = root_->child(i);
        if (item->text() == section) {
            parentItem = item;
            sectionExists = true;
            break;
        }
    }

    if (!sectionExists) {
        parentItem = new SessionTreeItem(section, root_);
        root_->appendChild(parentItem);
    }

    foreach (Session* s, sessions) {
        parentItem->appendChild(new SessionTreeItem(s, parentItem));
    }
}