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#include <QtGui>

#include "treeitem.h"

#include "treemodel.h"

//! [0]

TreeModel::TreeModel(const QStringList &headers, const QString &data,

                     QObject *parent)

    : QAbstractItemModel(parent)

{

    QVector<QVariant> rootData;

    foreach (QString header, headers)

        rootData << header;

    rootItem = new TreeItem(rootData);

    setupModelData(data.split(QString("\n")), rootItem);

}

//! [0]

//! [1]

TreeModel::~TreeModel()

{

    delete rootItem;

}

//! [1]

//! [2]

int TreeModel::columnCount(const QModelIndex & /* parent */) const

{

    return rootItem->columnCount();

}

//! [2]

QVariant TreeModel::data(const QModelIndex &index, int role) const

{

    if (!index.isValid())

        return QVariant();

    if (role != Qt::DisplayRole && role != Qt::EditRole)

        return QVariant();

    TreeItem *item = getItem(index);

    return item->data(index.column());

}

//! [3]

Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const

{

    if (!index.isValid())

        return 0;

    return Qt::ItemIsEditable | Qt::ItemIsEnabled | Qt::ItemIsSelectable;

}

//! [3]

//! [4]

TreeItem *TreeModel::getItem(const QModelIndex &index) const

{

    if (index.isValid()) {

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

        if (item) return item;

    }

    return rootItem;

}

//! [4]

QVariant TreeModel::headerData(int section, Qt::Orientation orientation,

                               int role) const

{

    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)

        return rootItem->data(section);

    return QVariant();

}

//! [5]

QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent) const

{

    if (parent.isValid() && parent.column() != 0)

        return QModelIndex();

//! [5]

//! [6]

    TreeItem *parentItem = getItem(parent);

    TreeItem *childItem = parentItem->child(row);

    if (childItem)

        return createIndex(row, column, childItem);

    else

        return QModelIndex();

}

//! [6]

bool TreeModel::insertColumns(int position, int columns, const QModelIndex &parent)

{

    bool success;

    beginInsertColumns(parent, position, position + columns - 1);

    success = rootItem->insertColumns(position, columns);

    endInsertColumns();

    return success;

}

bool TreeModel::insertRows(int position, int rows, const QModelIndex &parent)

{

    TreeItem *parentItem = getItem(parent);

    bool success;

    beginInsertRows(parent, position, position + rows - 1);

    success = parentItem->insertChildren(position, rows, rootItem->columnCount());

    endInsertRows();

    return success;

}

//! [7]

QModelIndex TreeModel::parent(const QModelIndex &index) const

{

    if (!index.isValid())

        return QModelIndex();

    TreeItem *childItem = getItem(index);

    TreeItem *parentItem = childItem->parent();

    if (parentItem == rootItem)

        return QModelIndex();

    return createIndex(parentItem->childNumber(), 0, parentItem);

}

//! [7]

bool TreeModel::removeColumns(int position, int columns, const QModelIndex &parent)

{

    bool success;

    beginRemoveColumns(parent, position, position + columns - 1);

    success = rootItem->removeColumns(position, columns);

    endRemoveColumns();

    if (rootItem->columnCount() == 0)

        removeRows(0, rowCount());

    return success;

}

bool TreeModel::removeRows(int position, int rows, const QModelIndex &parent)

{

    TreeItem *parentItem = getItem(parent);

    bool success = true;

    beginRemoveRows(parent, position, position + rows - 1);

    success = parentItem->removeChildren(position, rows);

    endRemoveRows();

    return success;

}

//! [8]

int TreeModel::rowCount(const QModelIndex &parent) const

{

    TreeItem *parentItem = getItem(parent);

    return parentItem->childCount();

}

//! [8]

bool TreeModel::setData(const QModelIndex &index, const QVariant &value,

                        int role)

{

    if (role != Qt::EditRole)

        return false;

    TreeItem *item = getItem(index);

    bool result = item->setData(index.column(), value);

    if (result)

        emit dataChanged(index, index);

    return result;

}

bool TreeModel::setHeaderData(int section, Qt::Orientation orientation,

                              const QVariant &value, int role)

{

    if (role != Qt::EditRole || orientation != Qt::Horizontal)

        return false;

    bool result = rootItem->setData(section, value);

    if (result)

        emit headerDataChanged(orientation, section, section);

    return result;

}

void TreeModel::setupModelData(const QStringList &lines, TreeItem *parent)

{

    QList<TreeItem*> parents;

    QList<int> indentations;

    parents << parent;

    indentations << 0;

    int number = 0;

    while (number < lines.count()) {

        int position = 0;

        while (position < lines[number].length()) {

            if (lines[number].mid(position, 1) != " ")

                break;

            position++;

        }

        QString lineData = lines[number].mid(position).trimmed();

        if (!lineData.isEmpty()) {

            // Read the column data from the rest of the line.

            QStringList columnStrings = lineData.split("\t", QString::SkipEmptyParts);

            QVector<QVariant> columnData;

            for (int column = 0; column < columnStrings.count(); ++column)

                columnData << columnStrings[column];

            if (position > indentations.last()) {

                // The last child of the current parent is now the new parent

                // unless the current parent has no children.

                if (parents.last()->childCount() > 0) {

                    parents << parents.last()->child(parents.last()->childCount()-1);

                    indentations << position;

                }

            } else {

                while (position < indentations.last() && parents.count() > 0) {

                    parents.pop_back();

                    indentations.pop_back();

                }

            }

            // Append a new item to the current parent's list of children.

            TreeItem *parent = parents.last();

            parent->insertChildren(parent->childCount(), 1, rootItem->columnCount());

            for (int column = 0; column < columnData.size(); ++column)

                parent->child(parent->childCount() - 1)->setData(column, columnData[column]);

        }

        number++;

    }

}