# encoding: utf-8
from __future__ import division, absolute_import, unicode_literals
import platform
import webbrowser
import sys

import qtpy
from qtpy.QtCore import Qt
from qtpy import QtGui
from qtpy import QtWidgets

from ..i18n import N_
from .. import core
from .. import resources
from .. import hotkeys
from .. import icons
from .. import qtutils
from .. import version
from . import defs


def about_dialog(context):
    """Launches the Help -> About dialog"""
    view = AboutView(context, qtutils.active_window())
    view.show()
    return view


class ExpandingTabBar(QtWidgets.QTabBar):
    """A TabBar with tabs that expand to fill the empty space

    The setExpanding(True) method does not work in practice because
    it respects the OS style.  We override the style by implementing
    tabSizeHint() so that we can specify the size explicitly.

    """

    def tabSizeHint(self, tab_index):
        width = self.parent().width() / max(1, self.count()) - 1
        size = super(ExpandingTabBar, self).tabSizeHint(tab_index)
        size.setWidth(width)
        return size


class ExpandingTabWidget(QtWidgets.QTabWidget):

    def __init__(self, parent=None):
        super(ExpandingTabWidget, self).__init__(parent)
        self.setTabBar(ExpandingTabBar(self))

    def resizeEvent(self, event):
        """Forward resize events to the ExpandingTabBar"""
        # Qt does not resize the tab bar when the dialog is resized
        # so manually forward resize events to the tab bar.
        width = event.size().width()
        height = self.tabBar().height()
        self.tabBar().resize(width, height)
        return super(ExpandingTabWidget, self).resizeEvent(event)


class AboutView(QtWidgets.QDialog):
    """Provides the git-cola 'About' dialog"""

    def __init__(self, context, parent=None):
        QtWidgets.QDialog.__init__(self, parent)

        self.context = context
        self.setWindowTitle(N_('About git-cola'))
        self.setWindowModality(Qt.WindowModal)

        # Top-most large icon
        logo_pixmap = icons.cola().pixmap(defs.huge_icon, defs.large_icon)

        self.logo_label = QtWidgets.QLabel()
        self.logo_label.setPixmap(logo_pixmap)
        self.logo_label.setAlignment(Qt.AlignCenter)

        self.logo_text_label = QtWidgets.QLabel()
        self.logo_text_label.setText('Git Cola')
        self.logo_text_label.setAlignment(Qt.AlignLeft | Qt.AlignCenter)

        font = self.logo_text_label.font()
        font.setPointSize(defs.logo_text)
        self.logo_text_label.setFont(font)

        self.text = qtutils.textbrowser(text=copyright_text())
        self.version = qtutils.textbrowser(text=version_text(context))
        self.authors = qtutils.textbrowser(text=authors_text())
        self.translators = qtutils.textbrowser(text=translators_text())

        self.tabs = ExpandingTabWidget()
        self.tabs.addTab(self.text, N_('About'))
        self.tabs.addTab(self.version, N_('Version'))
        self.tabs.addTab(self.authors, N_('Authors'))
        self.tabs.addTab(self.translators, N_('Translators'))

        self.close_button = qtutils.close_button()
        self.close_button.setDefault(True)

        self.logo_layout = qtutils.hbox(defs.no_margin, defs.button_spacing,
                                        self.logo_label, self.logo_text_label,
                                        qtutils.STRETCH)

        self.button_layout = qtutils.hbox(defs.spacing, defs.margin,
                                          qtutils.STRETCH, self.close_button)

        self.main_layout = qtutils.vbox(defs.no_margin, defs.spacing,
                                        self.logo_layout,
                                        self.tabs,
                                        self.button_layout)
        self.setLayout(self.main_layout)

        qtutils.connect_button(self.close_button, self.accept)

        self.resize(defs.scale(600), defs.scale(720))


def copyright_text():
    return """
Git Cola: The highly caffeinated Git GUI

Copyright (C) 2007-2018 David Aguilar and contributors

This program is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.

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 http://www.gnu.org/licenses/.

"""


def version_text(context):
    git_version = version.git_version(context)
    cola_version = version.version()
    build_version = version.build_version()
    python_path = sys.executable
    python_version = sys.version
    qt_version = qtpy.QT_VERSION
    qtpy_version = qtpy.__version__
    pyqt_api_name = qtpy.API_NAME
    if qtpy.PYQT5 or qtpy.PYQT4:
        pyqt_api_version = qtpy.PYQT_VERSION
    elif qtpy.PYSIDE:
        pyqt_api_version = qtpy.PYSIDE_VERSION
    else:
        pyqt_api_version = 'unknown'

    platform_version = platform.platform()

    # Only show the build version if _build_version.py exists
    if build_version:
        build_version = '(%s)' % build_version
    else:
        build_version = ''

    scope = dict(
        cola_version=cola_version,
        build_version=build_version,
        git_version=git_version,
        platform_version=platform_version,
        pyqt_api_name=pyqt_api_name,
        pyqt_api_version=pyqt_api_version,
        python_path=python_path,
        python_version=python_version,
        qt_version=qt_version,
        qtpy_version=qtpy_version)

    return N_("""
        <br>
            Git Cola version %(cola_version)s %(build_version)s
        <ul>
            <li> %(platform_version)s
            <li> Python (%(python_path)s) %(python_version)s
            <li> Git %(git_version)s
            <li> Qt %(qt_version)s
            <li> QtPy %(qtpy_version)s
            <li> %(pyqt_api_name)s %(pyqt_api_version)s
        </ul>
    """) % scope


def link(url, text, palette=None):
    if palette is None:
        palette = QtGui.QPalette()

    color = palette.color(QtGui.QPalette.Foreground)
    rgb = 'rgb(%s, %s, %s)' % (color.red(), color.green(), color.blue())
    scope = dict(rgb=rgb, text=text, url=url)

    return """
        <a style="font-style: italic; text-decoration: none; color: %(rgb)s;"
            href="%(url)s">
            %(text)s
        </a>
    """ % scope


def mailto(email, text, palette):
    return link('mailto:%s' % email, text, palette) + '<br>'


def render_authors(authors):
    """Render a list of author details into richtext html"""
    for x in authors:
        x.setdefault('email', '')

    entries = [("""
        <p>
            <strong>%(name)s</strong><br>
            <em>%(title)s</em><br>
            %(email)s
        </p>
    """ % author) for author in authors]

    return ''.join(entries)


def contributors_text(authors, prelude='', epilogue=''):
    author_text = render_authors(authors)
    scope = dict(author_text=author_text, epilogue=epilogue, prelude=prelude)

    return """
        %(prelude)s
        %(author_text)s
        %(epilogue)s
    """ % scope


def authors_text():
    palette = QtGui.QPalette()
    contact = N_('Email contributor')
    authors = (
        # The names listed here are listed in the same order as
        # `git shortlog --summary --numbered --no-merges`
        # Please submit a pull request if you would like to include your
        # email address in the about screen.
        # See the `generate-about` script in the "todo" branch.
        # vim :read! ./Meta/generate-about
        dict(name='David Aguilar',
             title=N_('Maintainer (since 2007) and developer'),
             email=mailto('davvid@gmail.com', contact, palette)),
        dict(name='Daniel Harding', title=N_('Developer')),
        dict(name='Ｖ字龍(Vdragon)', title=N_('Developer'),
             email=mailto('Vdragon.Taiwan@gmail.com', contact, palette)),
        dict(name='Efimov Vasily', title=N_('Developer')),
        dict(name='Guillaume de Bure', title=N_('Developer')),
        dict(name='Javier Rodriguez Cuevas', title=N_('Developer')),
        dict(name='Uri Okrent', title=N_('Developer')),
        dict(name='Alex Chernetz', title=N_('Developer')),
        dict(name='xhl', title=N_('Developer')),
        dict(name='Andreas Sommer', title=N_('Developer')),
        dict(name='Thomas Kluyver', title=N_('Developer')),
        dict(name='Minarto Margoliono', title=N_('Developer')),
        dict(name='Szymon Judasz', title=N_('Developer')),
        dict(name='Ville Skyttä', title=N_('Developer')),
        dict(name='jm4R', title=N_('Developer')),
        dict(name='Igor Galarraga', title=N_('Developer')),
        dict(name='Stanislaw Halik', title=N_('Developer')),
        dict(name='Virgil Dupras', title=N_('Developer')),
        dict(name='Barry Roberts', title=N_('Developer')),
        dict(name='wsdfhjxc', title=N_('Developer')),
        dict(name='林博仁(Buo-ren Lin)', title=N_('Developer')),
        dict(name='Guo Yunhe', title=N_('Developer')),
        dict(name='cclauss', title=N_('Developer')),
        dict(name='Stefan Naewe', title=N_('Developer')),
        dict(name='Victor Nepveu', title=N_('Developer')),
        dict(name='Benedict Lee', title=N_('Developer')),
        dict(name='Filip Danilović', title=N_('Developer')),
        dict(name='NotSqrt', title=N_('Developer')),
        dict(name='Pavel Rehak', title=N_('Developer')),
        dict(name='Steffen Prohaska', title=N_('Developer')),
        dict(name='Tim Brown', title=N_('Developer')),
        dict(name='Michael Geddes', title=N_('Developer')),
        dict(name='Rustam Safin', title=N_('Developer')),
        dict(name='Alex Gulyás', title=N_('Developer')),
        dict(name='David Martínez Martí', title=N_('Developer')),
        dict(name='Hualiang Xie', title=N_('Developer')),
        dict(name='Justin Lecher', title=N_('Developer')),
        dict(name='Kai Krakow', title=N_('Developer')),
        dict(name='Karl Bielefeldt', title=N_('Developer')),
        dict(name='Marco Costalba', title=N_('Developer')),
        dict(name='Michael Homer', title=N_('Developer')),
        dict(name='Sebastian Schuberth', title=N_('Developer')),
        dict(name='Sven Claussner', title=N_('Developer')),
        dict(name='bsomers', title=N_('Developer')),
        dict(name='real', title=N_('Developer')),
        dict(name='v.paritskiy', title=N_('Developer')),
        dict(name='0xflotus', title=N_('Developer')),
        dict(name='AJ Bagwell', title=N_('Developer')),
        dict(name='Adrien be', title=N_('Developer')),
        dict(name='Andrej', title=N_('Developer')),
        dict(name='Arthur Coelho', title=N_('Developer')),
        dict(name='Audrius Karabanovas', title=N_('Developer')),
        dict(name='Barrett Lowe', title=N_('Developer')),
        dict(name='Ben Boeckel', title=N_('Developer')),
        dict(name='Boris W', title=N_('Developer')),
        dict(name='Charles', title=N_('Developer')),
        dict(name='Clément Pit--Claudel', title=N_('Developer')),
        dict(name='Daniel Haskin', title=N_('Developer')),
        dict(name='Daniel King', title=N_('Developer')),
        dict(name='Daniel Pavel', title=N_('Developer')),
        dict(name='David Zumbrunnen', title=N_('Developer')),
        dict(name='Felipe Morales', title=N_('Developer')),
        dict(name='George Vasilakos', title=N_('Developer')),
        dict(name='Ilya Tumaykin', title=N_('Developer')),
        dict(name='Iulian Udrea', title=N_('Developer')),
        dict(name='Jake Biesinger', title=N_('Developer')),
        dict(name='Jakub Szymański', title=N_('Developer')),
        dict(name='Jamie Pate', title=N_('Developer')),
        dict(name='Jean-Francois Dagenais', title=N_('Developer')),
        dict(name='Joachim Lusiardi', title=N_('Developer')),
        dict(name='Karthik Manamcheri', title=N_('Developer')),
        dict(name='Kelvie Wong', title=N_('Developer')),
        dict(name='Kyle', title=N_('Developer')),
        dict(name='Maciej Filipiak', title=N_('Developer')),
        dict(name='Maicon D. Filippsen', title=N_('Developer')),
        dict(name='Markus Heidelberg', title=N_('Developer')),
        dict(name='Matthew E. Levine', title=N_('Developer')),
        dict(name='Matthias Mailänder', title=N_('Developer')),
        dict(name='Md. Mahbub Alam', title=N_('Developer')),
        dict(name='Mikhail Terekhov', title=N_('Developer')),
        dict(name='Paul Hildebrandt', title=N_('Developer')),
        dict(name='Paul Weingardt', title=N_('Developer')),
        dict(name='Paulo Fidalgo', title=N_('Developer')),
        dict(name='Petr Gladkikh', title=N_('Developer')),
        dict(name='Philip Stark', title=N_('Developer')),
        dict(name='Radek Postołowicz', title=N_('Developer')),
        dict(name='Rainer Müller', title=N_('Developer')),
        dict(name='Ricardo J. Barberis', title=N_('Developer')),
        dict(name='Rolando Espinoza', title=N_('Developer')),
        dict(name="Samsul Ma'arif", title=N_('Developer')),
        dict(name='Sebastian Brass', title=N_('Developer')),
        dict(name='Simon Peeters', title=N_('Developer')),
        dict(name='Stephen', title=N_('Developer')),
        dict(name='Vaibhav Sagar', title=N_('Developer')),
        dict(name='Ved Vyas', title=N_('Developer')),
        dict(name='Voicu Hodrea', title=N_('Developer')),
        dict(name='Wesley Wong', title=N_('Developer')),
        dict(name='Wolfgang Ocker', title=N_('Developer')),
        dict(name='Zhang Han', title=N_('Developer')),
        dict(name='beauxq', title=N_('Developer')),
        dict(name='ochristi', title=N_('Developer')),
    )
    bug_url = 'https://github.com/git-cola/git-cola/issues'
    bug_link = link(bug_url, bug_url)
    scope = dict(bug_link=bug_link)
    prelude = N_("""
        <br>
        Please use %(bug_link)s to report issues.
        <br>
    """) % scope

    return contributors_text(authors, prelude=prelude)


def translators_text():
    palette = QtGui.QPalette()
    contact = N_('Email contributor')

    translators = (
        # See the `generate-about` script in the "todo" branch.
        # vim :read! ./Meta/generate-about --translators
        dict(name='Ｖ字龍(Vdragon)',
             title=N_('Traditional Chinese (Taiwan) translation'),
             email=mailto('Vdragon.Taiwan@gmail.com', contact, palette)),
        dict(name='Pavel Rehak',
             title=N_('Czech translation')),
        dict(name='Victorhck',
             title=N_('Spanish translation')),
        dict(name='Vitor Lobo',
             title=N_('Brazilian translation')),
        dict(name='Zhang Han',
             title=N_('Simplified Chinese translation')),
        dict(name='Igor Kopach',
             title=N_('Ukranian translation')),
        dict(name='Barış ÇELİK',
             title=N_('Turkish translation')),
        dict(name='Guo Yunhe',
             title=N_('Simplified Chinese translation')),
        dict(name='Minarto Margoliono',
             title=N_('Indonesian translation')),
        dict(name='Rafael Nascimento',
             title=N_('Brazilian translation')),
        dict(name='Shun Sakai',
             title=N_('Japanese translation')),
        dict(name='Sven Claussner',
             title=N_('German translation')),
        dict(name='Vaiz',
             title=N_('Russian translation')),
        dict(name='adlgrbz',
             title=N_('Turkish translation')),
        dict(name='fu7mu4',
             title=N_('Japanese translation')),
        dict(name='Gyuris Gellért',
             title=N_('Hungarian translation')),
        dict(name='Joachim Lusiardi',
             title=N_('German translation')),
        dict(name='Kai Krakow',
             title=N_('German translation')),
        dict(name='Louis Rousseau',
             title=N_('French translation')),
        dict(name='Mickael Albertus',
             title=N_('French translation')),
        dict(name='Peter Dave Hello',
             title=N_('Traditional Chinese (Taiwan) translation')),
        dict(name='Pilar Molina Lopez',
             title=N_('Spanish translation')),
        dict(name='Rafael Reuber',
             title=N_('Brazilian translation')),
        dict(name='Sabri Ünal',
             title=N_('Turkish translation')),
        dict(name="Samsul Ma'arif",
             title=N_('Indonesian translation')),
        dict(name='Zeioth',
             title=N_('Spanish translation')),
        dict(name='balping',
             title=N_('Hungarian translation')),
        dict(name='p-bo',
             title=N_('Czech translation')),
        dict(name='Łukasz Wojniłowicz',
             title=N_('Polish translation')),
        dict(name='林博仁(Buo-ren Lin)',
             title=N_('Traditional Chinese (Taiwan) translation')),
    )

    bug_url = 'https://github.com/git-cola/git-cola/issues'
    bug_link = link(bug_url, bug_url)
    scope = dict(bug_link=bug_link)

    prelude = N_("""
        <br>
            Git Cola has been translated into different languages thanks
            to the help of the individuals listed below.

        <br>
        <p>
            Translation is approximate.  If you find a mistake,
            please let us know by opening an issue on Github:
        </p>

        <p>
            %(bug_link)s
        </p>

        <br>
        <p>
            We invite you to participate in translation by adding or updating
            a translation and opening a pull request.
        </p>

        <br>

    """) % scope
    return contributors_text(translators, prelude=prelude)


def show_shortcuts():
    hotkeys_html = resources.doc(N_('hotkeys.html'))
    try:
        from qtpy import QtWebEngineWidgets
    except (ImportError, qtpy.PythonQtError):
        # redhat disabled QtWebKit in their qt build but don't punish the users
        webbrowser.open_new_tab('file://' + hotkeys_html)
        return

    html = core.read(hotkeys_html)

    parent = qtutils.active_window()
    widget = QtWidgets.QDialog(parent)
    widget.setWindowModality(Qt.WindowModal)
    widget.setWindowTitle(N_('Shortcuts'))

    web = QtWebEngineWidgets.QWebEngineView()
    web.setHtml(html)

    layout = qtutils.hbox(defs.no_margin, defs.spacing, web)
    widget.setLayout(layout)
    widget.resize(800, min(parent.height(), 600))
    qtutils.add_action(widget, N_('Close'), widget.accept,
                       hotkeys.QUESTION, *hotkeys.ACCEPT)
    widget.show()
    widget.exec_()
