# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial

''' Test bug 688: http://bugs.openbossa.org/show_bug.cgi?id=688'''

import os
import sys
import unittest

from pathlib import Path
sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
from init_paths import init_test_paths
init_test_paths(False)

from helper.usesqapplication import UsesQApplication
from PySide6.QtGui import QTextFrame, QTextCursor, QTextCharFormat, QFont, QTextFrameFormat
from PySide6.QtWidgets import QTextEdit


class BugTest(UsesQApplication):
    def testCase(self):
        editor = QTextEdit()
        cursor = QTextCursor(editor.textCursor())
        cursor.movePosition(QTextCursor.Start)

        mainFrame = cursor.currentFrame()

        plainCharFormat = QTextCharFormat()
        boldCharFormat = QTextCharFormat()
        boldCharFormat.setFontWeight(QFont.Bold)
        cursor.insertText("""
                          Text documents are represented by the
                          QTextDocument class, rather than by QString objects.
                          Each QTextDocument object contains information about
                          the document's internal representation, its structure,
                          and keeps track of modifications to provide undo/redo
                          facilities. This approach allows features such as the
                          layout management to be delegated to specialized
                          classes, but also provides a focus for the framework.""",
                          plainCharFormat)

        frameFormat = QTextFrameFormat()
        frameFormat.setMargin(32)
        frameFormat.setPadding(8)
        frameFormat.setBorder(4)
        cursor.insertFrame(frameFormat)

        cursor.insertText("""
                          Documents are either converted from external sources
                          or created from scratch using Qt. The creation process
                          can done by an editor widget, such as QTextEdit, or by
                          explicit calls to the Scribe API.""",
                          boldCharFormat)

        cursor = mainFrame.lastCursorPosition()
        cursor.insertText("""
                          There are two complementary ways to visualize the
                          contents of a document: as a linear buffer that is
                          used by editors to modify the contents, and as an
                          object hierarchy containing structural information
                          that is useful to layout engines. In the hierarchical
                          model, the objects generally correspond to visual
                          elements such as frames, tables, and lists. At a lower
                          level, these elements describe properties such as the
                          style of text used and its alignment. The linear
                          representation of the document is used for editing and
                          manipulation of the document's contents.""",
                          plainCharFormat)

        frame = cursor.currentFrame()

        items = []

        # test iterator
        for i in frame:
            items.append(i)

        # test __iadd__
        b = frame.begin()
        i = 0
        while not b.atEnd():
            self.assertEqual(b, items[i])
            self.assertTrue(b.parentFrame(), items[i].parentFrame())
            b.__iadd__(1)
            i += 1

        # test __isub__
        b = frame.end()
        i = 0
        while i > 0:
            self.assertEqual(b, items[i])
            self.assertTrue(b.parentFrame(), items[i].parentFrame())
            b.__isub__(1)
            i -= 1


if __name__ == '__main__':
    unittest.main()
