import textwrap

import PySide6
from PySide6.QtCore import Qt
from PySide6.QtGui import QFont, QPixmap
from PySide6.QtWidgets import *

import constants
from label import Label
from vbox import VBox


class AboutDialog(QDialog):
    """Dialog for showing info about RavenLog"""

    def __init__(self, parent=None):
        super(AboutDialog, self).__init__(parent)
        self.setWindowTitle(self.tr("About RavenLog"))
        self.setModal(True)

        self.layout = QVBoxLayout(self)

        heading_app_name = QLabel("RavenLog")
        heading_app_name.setAlignment(Qt.AlignmentFlag.AlignLeft)
        heading_app_name.setFont(QFont("default", 25))
        heading_app_name.setTextInteractionFlags(Qt.TextInteractionFlag.TextSelectableByMouse)

        version = QLabel(self.tr("Version: {0}".format(self._version())))
        version.setAlignment(Qt.AlignmentFlag.AlignLeft)

        app_icon = QLabel()
        app_icon.setPixmap(QPixmap(constants.raven_icon))
        heading = QWidget(self)
        hbox = QHBoxLayout(heading)
        hbox.addWidget(app_icon)
        hbox.addWidget(VBox(heading_app_name, version))
        hbox.addSpacerItem(QSpacerItem(1, 1, hData=QSizePolicy.Policy.Expanding))

        heading.layout = hbox
        self.layout.addWidget(heading)

        tabs = QTabWidget()
        tabs.addTab(self._about(), self.tr("About"))
        tabs.addTab(self._license(), self.tr("License"))

        self.layout.addWidget(tabs)

        buttons = QDialogButtonBox(self)
        buttons.setStandardButtons(QDialogButtonBox.StandardButton.Close)
        buttons.rejected.connect(self.close)
        self.layout.addWidget(buttons)

    def _about(self) -> QWidget:
        result = QWidget()
        result.layout = QVBoxLayout(result)
        label = Label(self.tr(textwrap.dedent("""
        Log file viewer<br>
        (c) 2022 Open Text Corporation<br>
        <a href="https://www.opentext.com/">License: LGPL v3</a>""")))
        result.layout.addWidget(label)
        return result

    def _license(self) -> QWidget:
        dependencies = """
        <ul>
        <li>PySide6 {pyside} (LGPL v3) - <a href="https://doc.qt.io/qtforpython-6/">https://doc.qt.io/qtforpython-6/</a></li>
        <li>Qt6 {qt} (LGPL v3) - <a href="https://code.qt.io/cgit/qt/qtbase.git/">https://code.qt.io/cgit/qt/qtbase.git/</a></li>
        <li>urllib3 (MIT) - <a href="https://urllib3.readthedocs.io/en/stable/">https://urllib3.readthedocs.io/en/stable/</a></li>
        <li>watchdog 2.16 (Apache 2.0) - <a href="https://github.com/gorakhargosh/watchdog">https://github.com/gorakhargosh/watchdog</a></li>
        </ul>""".format(pyside=PySide6.__version__, qt=PySide6.QtCore.__version__)
        label = self.tr(textwrap.dedent(dependencies))

        result = QWidget()
        result.layout = QVBoxLayout(result)
        result.layout.addWidget(Label(label))
        return result

    def _version(self):
        with open('VERSION.info', "rt") as f:
            line = f.readline()
            version = line.strip()
            return version