/* proto_tree_model.cpp
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include <ui/qt/models/proto_tree_model.h>

#include <epan/prefs.h>

#include <ui/qt/utils/color_utils.h>

#include <QApplication>
#include <QPalette>

// To do:
// - Add ProtoTreeDelegate
// - Add ProtoTreeModel to CaptureFile

ProtoTreeModel::ProtoTreeModel(QObject * parent) :
    QAbstractItemModel(parent),
    root_node_(0)
{}

Qt::ItemFlags ProtoTreeModel::flags(const QModelIndex &index) const
{
    Qt::ItemFlags item_flags = QAbstractItemModel::flags(index);
    if (rowCount(index) < 1) {
        item_flags |= Qt::ItemNeverHasChildren;
    }

    return item_flags;
}

QModelIndex ProtoTreeModel::index(int row, int, const QModelIndex &parent) const
{
    ProtoNode parent_node(root_node_);

    if (parent.isValid()) {
        // index is not a top level item.
        parent_node = protoNodeFromIndex(parent);
    }

    if (! parent_node.isValid() )
        return QModelIndex();

    int cur_row = 0;
    ProtoNode::ChildIterator kids = parent_node.children();
    while ( kids.element().isValid() )
    {
        if ( cur_row == row )
            break;
        cur_row++;
        kids.next();
    }
    if ( ! kids.element().isValid() ) {
        return QModelIndex();
    }

    return createIndex(row, 0, static_cast<void *>(kids.element().protoNode()));
}

QModelIndex ProtoTreeModel::parent(const QModelIndex &index) const
{
    ProtoNode parent_node = protoNodeFromIndex(index).parentNode();
    return indexFromProtoNode(parent_node);
}

int ProtoTreeModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid()) {
        return protoNodeFromIndex(parent).childrenCount();
    }
    return ProtoNode(root_node_).childrenCount();
}

// The QItemDelegate documentation says
// "When displaying items from a custom model in a standard view, it is
//  often sufficient to simply ensure that the model returns appropriate
//  data for each of the roles that determine the appearance of items in
//  views."
// We might want to move this to a delegate regardless.
QVariant ProtoTreeModel::data(const QModelIndex &index, int role) const
{
    ProtoNode index_node = protoNodeFromIndex(index);
    FieldInformation finfo(index_node.protoNode());
    if (!finfo.isValid()) {
        return QVariant();
    }

    switch (role) {
    case Qt::DisplayRole:
        return index_node.labelText();
    case Qt::BackgroundRole:
    {
        switch(finfo.flag(PI_SEVERITY_MASK)) {
        case(0):
            break;
        case(PI_COMMENT):
            return ColorUtils::expert_color_comment;
        case(PI_CHAT):
            return ColorUtils::expert_color_chat;
        case(PI_NOTE):
            return ColorUtils::expert_color_note;
        case(PI_WARN):
            return ColorUtils::expert_color_warn;
        case(PI_ERROR):
            return ColorUtils::expert_color_error;
        default:
            g_warning("%s:%d Unhandled severity flag: %u", G_STRFUNC, __LINE__, finfo.flag(PI_SEVERITY_MASK));
        }
        if(finfo.headerInfo().type == FT_PROTOCOL) {
            return QApplication::palette().window();
        }
        return QApplication::palette().base();
    }
    case Qt::ForegroundRole:
    {
        if(finfo.flag(PI_SEVERITY_MASK)) {
            return ColorUtils::expert_color_foreground;
        }
        if (finfo.isLink()) {
            return ColorUtils::themeLinkBrush();
        }
        if(finfo.headerInfo().type == FT_PROTOCOL) {
            return QApplication::palette().windowText();
        }
        return QApplication::palette().text();
    }
    case Qt::FontRole:
        if (finfo.isLink()) {
            QFont font;
            font.setUnderline(true);
            return font;
        }
    default:
        break;
    }

    return QVariant();
}

void ProtoTreeModel::setRootNode(proto_node *root_node)
{
    beginResetModel();
    root_node_ = root_node;
    endResetModel();
    if (!root_node) return;

    int row_count = ProtoNode(root_node_).childrenCount();
    if (row_count < 1) return;
    beginInsertRows(QModelIndex(), 0, row_count - 1);
    endInsertRows();
}

ProtoNode ProtoTreeModel::protoNodeFromIndex(const QModelIndex &index) const
{
    return ProtoNode(static_cast<proto_node*>(index.internalPointer()));
}

QModelIndex ProtoTreeModel::indexFromProtoNode(ProtoNode &index_node) const
{
    int row = index_node.row();

    if (!index_node.isValid() || row < 0) {
        return QModelIndex();
    }

    return createIndex(row, 0, static_cast<void *>(index_node.protoNode()));
}

struct find_hfid_ {
    int hfid;
    ProtoNode node;
};

void ProtoTreeModel::foreachFindHfid(proto_node *node, gpointer find_hfid_ptr)
{
    struct find_hfid_ *find_hfid = (struct find_hfid_ *) find_hfid_ptr;
    if (PNODE_FINFO(node)->hfinfo->id == find_hfid->hfid) {
        find_hfid->node = ProtoNode(node);
        return;
    }
    proto_tree_children_foreach(node, foreachFindHfid, find_hfid);
}

QModelIndex ProtoTreeModel::findFirstHfid(int hf_id)
{
    if (!root_node_ || hf_id < 0) return QModelIndex();

    struct find_hfid_ find_hfid;
    find_hfid.hfid = hf_id;

    proto_tree_children_foreach(root_node_, foreachFindHfid, &find_hfid);

    if (find_hfid.node.isValid()) {
        return indexFromProtoNode(find_hfid.node);
    }
    return QModelIndex();
}

struct find_field_info_ {
    field_info *fi;
    ProtoNode node;
};

void ProtoTreeModel::foreachFindField(proto_node *node, gpointer find_finfo_ptr)
{
    struct find_field_info_ *find_finfo = (struct find_field_info_ *) find_finfo_ptr;
    if (PNODE_FINFO(node) == find_finfo->fi) {
        find_finfo->node = ProtoNode(node);
        return;
    }
    proto_tree_children_foreach(node, foreachFindField, find_finfo);
}

QModelIndex ProtoTreeModel::findFieldInformation(FieldInformation *finfo)
{
    if (!root_node_ || !finfo) return QModelIndex();
    field_info * fi = finfo->fieldInfo();
    if (!fi) return QModelIndex();

    struct find_field_info_ find_finfo;
    find_finfo.fi = fi;

    proto_tree_children_foreach(root_node_, foreachFindField, &find_finfo);
    if (find_finfo.node.isValid()) {
        return indexFromProtoNode(find_finfo.node);
    }
    return QModelIndex();
}

/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */