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#############################################################################
##
## Copyright (C) 2011 Arun Srinivasan <rulfzid@gmail.com>
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

from PySide2.QtCore import (Qt, QAbstractTableModel, QModelIndex)

class TableModel(QAbstractTableModel):

    def __init__(self, addresses=None, parent=None):
        super(TableModel, self).__init__(parent)

        if addresses is None:
            self.addresses = []
        else:
            self.addresses = addresses

    def rowCount(self, index=QModelIndex()):
        """ Returns the number of rows the model holds. """
        return len(self.addresses)

    def columnCount(self, index=QModelIndex()):
        """ Returns the number of columns the model holds. """
        return 2

    def data(self, index, role=Qt.DisplayRole):
        """ Depending on the index and role given, return data. If not
            returning data, return None (PySide equivalent of QT's
            "invalid QVariant").
        """
        if not index.isValid():
            return None

        if not 0 <= index.row() < len(self.addresses):
            return None

        if role == Qt.DisplayRole:
            name = self.addresses[index.row()]["name"]
            address = self.addresses[index.row()]["address"]

            if index.column() == 0:
                return name
            elif index.column() == 1:
                return address

        return None

    def headerData(self, section, orientation, role=Qt.DisplayRole):
        """ Set the headers to be displayed. """
        if role != Qt.DisplayRole:
            return None

        if orientation == Qt.Horizontal:
            if section == 0:
                return "Name"
            elif section == 1:
                return "Address"

        return None

    def insertRows(self, position, rows=1, index=QModelIndex()):
        """ Insert a row into the model. """
        self.beginInsertRows(QModelIndex(), position, position + rows - 1)

        for row in range(rows):
            self.addresses.insert(position + row, {"name":"", "address":""})

        self.endInsertRows()
        return True

    def removeRows(self, position, rows=1, index=QModelIndex()):
        """ Remove a row from the model. """
        self.beginRemoveRows(QModelIndex(), position, position + rows - 1)

        del self.addresses[position:position+rows]

        self.endRemoveRows()
        return True

    def setData(self, index, value, role=Qt.EditRole):
        """ Adjust the data (set it to <value>) depending on the given
            index and role.
        """
        if role != Qt.EditRole:
            return False

        if index.isValid() and 0 <= index.row() < len(self.addresses):
            address = self.addresses[index.row()]
            if index.column() == 0:
                address["name"] = value
            elif index.column() == 1:
                address["address"] = value
            else:
                return False

            self.dataChanged.emit(index, index, 0)
            return True

        return False

    def flags(self, index):
        """ Set the item flags at the given index. Seems like we're
            implementing this function just to see how it's done, as we
            manually adjust each tableView to have NoEditTriggers.
        """
        if not index.isValid():
            return Qt.ItemIsEnabled
        return Qt.ItemFlags(QAbstractTableModel.flags(self, index) |
                            Qt.ItemIsEditable)