# -*- coding: utf-8 -*-

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2019 OpenLP Developers                              #
# ---------------------------------------------------------------------- #
# This program is free software: you can redistribute it and/or modify   #
# it under the terms of the GNU General Public License as published by   #
# the Free Software Foundation, either version 3 of the License, or      #
# (at your option) any later version.                                    #
#                                                                        #
# This program is distributed in the hope that it will be useful,        #
# but WITHOUT ANY WARRANTY; without even the implied warranty of         #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          #
# GNU General Public License for more details.                           #
#                                                                        #
# You should have received a copy of the GNU General Public License      #
# along with this program.  If not, see <https://www.gnu.org/licenses/>. #
##########################################################################
"""
The :mod:`~openlp.core.ui.dark` module looks for and loads a dark theme
"""
from PyQt5 import QtGui

from openlp.core.common import is_win
from openlp.core.common.registry import Registry
from openlp.core.common.settings import Settings


try:
    import qdarkstyle
    HAS_DARK_STYLE = True
except ImportError:
    HAS_DARK_STYLE = False

WIN_REPAIR_STYLESHEET = """
QMainWindow::separator
{
  border: none;
}

QDockWidget::title
{
  border: 1px solid palette(dark);
  padding-left: 5px;
  padding-top: 2px;
  margin: 1px 0;
}

QToolBar
{
  border: none;
  margin: 0;
  padding: 0;
}
"""

MEDIA_MANAGER_STYLE = """
::tab#media_tool_box {
    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
        stop: 0 palette(button), stop: 1.0 palette(mid));
    border: 0;
    border-radius: 2px;
    margin-top: 0;
    margin-bottom: 0;
    text-align: left;
}
/* This is here to make the tabs on KDE with the Breeze theme work */
::tab:selected {}
"""

PROGRESSBAR_STYLE = """
QProgressBar{
    height: 10px;
}
"""


def get_application_stylesheet():
    """
    Return the correct application stylesheet based on the current style and operating system

    :return str: The correct stylesheet as a string
    """
    stylesheet = ''
    if HAS_DARK_STYLE and Settings().value('advanced/use_dark_style'):
        stylesheet = qdarkstyle.load_stylesheet_pyqt5()
    else:
        if not Settings().value('advanced/alternate rows'):
            base_color = Registry().get('application').palette().color(QtGui.QPalette.Active, QtGui.QPalette.Base)
            alternate_rows_repair_stylesheet = \
                'QTableWidget, QListWidget, QTreeWidget {alternate-background-color: ' + base_color.name() + ';}\n'
            stylesheet += alternate_rows_repair_stylesheet
        if is_win():
            stylesheet += WIN_REPAIR_STYLESHEET
    return stylesheet


def get_library_stylesheet():
    """
    Return the correct stylesheet for the main window

    :return str: The correct stylesheet as a string
    """
    if not HAS_DARK_STYLE or not Settings().value('advanced/use_dark_style'):
        return MEDIA_MANAGER_STYLE
    else:
        return ''