# -*- coding: iso-8859-1 -*-
# Copyright (C) 2008-2011 Bastian Kleineidam
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import os
import sys
import webbrowser
from PyQt4 import QtCore, QtGui
from .linkchecker_ui_main import Ui_MainWindow
from .properties import set_properties, clear_properties
from .statistics import set_statistics, clear_statistics
from .debug import LinkCheckerDebug
from .logger import GuiLogger, GuiLogHandler, StatusLogger
from .help import HelpWindow
from .options import LinkCheckerOptions
from .checker import CheckerThread
from .contextmenu import ContextMenu
from .editor import EditorWindow
from .updater import UpdateDialog
from .urlmodel import UrlItemModel
from .urlsave import urlsave
from .settings import Settings
from .recentdocs import RecentDocumentModel
from .. import configuration, checker, director, add_intern_pattern, \
    strformat, fileutil, LinkCheckerError
from ..containers import enum
from .. import url as urlutil
from ..checker import httpheaders


DocBaseUrl = "qthelp://bfk.app.linkchecker/doc/"
RegistryBase = "Bastian"
Status = enum('idle', 'checking')


def get_app_style ():
    """Return appropriate QStyle object for the current platform to
    be used in QApplication.setStyle().
    Currently prefers Macintosh on OS X, else Plastique.
    Style names are case insensitive.

    See also
    http://doc.trolltech.com/latest/gallery-macintosh.html
    and
    http://doc.trolltech.com/latest/gallery-plastique.html
    """
    if sys.platform == 'darwin':
        style = "Macintosh"
    else:
        style = "Plastique"
    return QtGui.QStyleFactory.create(style)


def get_icon (name):
    """Return QIcon with given pixmap resource name."""
    icon = QtGui.QIcon()
    icon.addPixmap(QtGui.QPixmap(name), QtGui.QIcon.Normal, QtGui.QIcon.Off)
    return icon


class LinkCheckerMain (QtGui.QMainWindow, Ui_MainWindow):
    """The main window displaying checked URLs."""

    log_url_signal = QtCore.pyqtSignal(object)
    log_status_signal = QtCore.pyqtSignal(int, int, int, float)
    log_stats_signal = QtCore.pyqtSignal(object)
    error_signal = QtCore.pyqtSignal(str)

    def __init__(self, parent=None, url=None):
        """Initialize UI."""
        super(LinkCheckerMain, self).__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowContextHelpButtonHint)
        self.setWindowTitle(configuration.App)
        # app settings
        self.settings = Settings(RegistryBase, configuration.AppName)
        # init subdialogs
        self.options = LinkCheckerOptions(parent=self)
        self.debug = LinkCheckerDebug(parent=self)
        self.checker = CheckerThread(parent=self)
        self.contextmenu = ContextMenu(parent=self)
        self.editor = EditorWindow(parent=self)
        # Note: do not use QT assistant here because of the .exe packaging
        self.assistant = HelpWindow(self, self.get_qhcpath())
        self.config_error = None
        self.icon_start = get_icon(":/icons/start.png")
        self.icon_stop = get_icon(":/icons/stop.png")
        self.movie = QtGui.QMovie(":/icons/busy.gif")
        self.movie.setCacheMode(QtGui.QMovie.CacheAll)
        self.label_busy.setText(u"")
        self.label_busy.setMovie(self.movie)
        # init the rest
        self.init_url(url)
        self.init_treeview()
        self.connect_widgets()
        self.init_config()
        self.read_config()
        self.init_app()

    def init_url (self, url):
        """Initialize URL input."""
        documents = self.settings.read_recent_documents()
        self.recent = RecentDocumentModel(parent=self, documents=documents)
        self.urlinput.setModel(self.recent)
        if url:
            self.urlinput.setText(url)
        elif documents:
            self.urlinput.setText(documents[0])

    def init_app (self):
        """Set window size and position, GUI options and reset status."""
        data = self.settings.read_geometry()
        if data["size"] is not None:
            self.resize(data["size"])
        if data["pos"] is not None:
            self.move(data["pos"])
        self.options.set_options(self.settings.read_options())
        self.status = Status.idle
        self.actionSave.setEnabled(False)
        msg = self.config_error or _("Ready.")
        self.set_statusmsg(msg)

    def get_qhcpath (self):
        """Helper function to search for the QHC help file in different
        locations."""
        paths = [
            # when developing
            os.path.join(configuration.configdata.install_data, "doc", "html"),
            # when running under py2exe
            os.path.join(os.path.dirname(os.path.abspath(sys.executable)), "share", "linkchecker"),
            # after installing as a package
            configuration.configdata.config_dir,
        ]
        for path in paths:
            qhcfile = os.path.join(path, "lccollection.qhc")
            if os.path.isfile(qhcfile):
                break
        return qhcfile

    def connect_widgets (self):
        """Connect widget signals. Some signals use the AutoConnect feature.
        Autoconnected methods have the form on_<objectname>_<signal>.
        """
        def set_idle ():
            """Set application status to idle."""
            self.status = Status.idle
            self.set_statusmsg(_("Check finished."))
            self.controlButton.clicked.disconnect(self.checker.cancel)
        self.checker.finished.connect(set_idle)
        self.checker.terminated.connect(set_idle)
        self.log_url_signal.connect(self.model.log_url)
        self.log_stats_signal.connect(self.log_stats)
        self.error_signal.connect(self.internal_error)
        self.options.editor.saved.connect(self.read_config)
        self.log_status_signal.connect(self.log_status)

    def init_treeview (self):
        """Set treeview model and layout."""
        self.model = UrlItemModel()
        self.treeView.setModel(self.model)
        data = self.settings.read_treeviewcols()
        self.treeView.setColumnWidth(0, data["col1"])
        self.treeView.setColumnWidth(1, data["col2"])
        self.treeView.setColumnWidth(2, data["col3"])
        selectionModel = self.treeView.selectionModel()
        selectionModel.selectionChanged.connect(self.set_properties)

    def get_treeviewcols (self):
        """Return URL treeview column widths."""
        return dict(
            col1=self.treeView.columnWidth(0),
            col2=self.treeView.columnWidth(1),
            col3=self.treeView.columnWidth(2),
        )

    def init_config (self):
        """Create a configuration object."""
        self.config = configuration.Configuration()
        # set standard GUI configuration values
        self.config.logger_add("gui", GuiLogger)
        self.config["logger"] = self.config.logger_new('gui',
            signal=self.log_url_signal, stats=self.log_stats_signal)
        self.config["status"] = True
        self.config["status_wait_seconds"] = 2
        self.handler = GuiLogHandler(self.debug.log_msg_signal)
        status = StatusLogger(self.log_status_signal)
        self.config.init_logging(status, handler=self.handler)

    def read_config (self, filename=None):
        """Read user and system configuration file."""
        try:
            self.config.read()
        except LinkCheckerError, msg:
            self.config_error = msg

    def set_config (self):
        """Set configuration."""
        data = self.options.get_options()
        self.config["recursionlevel"] = data["recursionlevel"]
        self.config["verbose"] = data["verbose"]
        if data["debug"]:
            self.config.set_debug(["all"])
            # make sure at least one thread is used
            self.config["threads"] = 1
        else:
            self.config.reset_loglevel()

    def get_status (self):
        """Return current application status."""
        return self._status

    def set_status (self, status):
        """Set application status."""
        self._status = status
        if status == Status.idle:
            self.aggregate = None
            self.controlButton.setText(_("Start"))
            self.controlButton.setIcon(self.icon_start)
            self.controlButton.setEnabled(True)
            self.actionSave.setEnabled(True)
            self.actionDebug.setEnabled(self.options.get_options()["debug"])
            self.treeView.sortByColumn(0, QtCore.Qt.AscendingOrder)
            self.treeView.setSortingEnabled(True)
            self.treeView.scrollToTop()
            self.movie.stop()
            # Reset progress information.
            self.label_active.setText(u"0")
            self.label_queued.setText(u"0")
            self.label_checked.setText(u"0")
            self.label_busy.hide()
            self.menubar.setEnabled(True)
            self.urlinput.setEnabled(True)
        elif status == Status.checking:
            self.treeView.setSortingEnabled(False)
            self.debug.reset()
            self.set_statusmsg(u"Checking site...")
            # disable commands
            self.menubar.setEnabled(False)
            self.urlinput.setEnabled(False)
            # reset widgets
            self.controlButton.setText(_("Stop"))
            self.controlButton.setIcon(self.icon_stop)
            self.controlButton.clicked.connect(self.checker.cancel)
            self.movie.start()
            self.label_busy.show()

    status = property(get_status, set_status)

    @QtCore.pyqtSlot()
    def on_actionHelp_triggered (self):
        """Show help page."""
        url = QtCore.QUrl("%sindex.html" % DocBaseUrl)
        self.assistant.showDocumentation(url)

    @QtCore.pyqtSlot()
    def on_actionOptions_triggered (self):
        """Show option dialog."""
        self.options.exec_()

    @QtCore.pyqtSlot()
    def on_actionQuit_triggered (self):
        """Quit application."""
        self.close()

    def closeEvent (self, e=None):
        """Save settings and remove registered logging handler"""
        self.settings.save_geometry(dict(size=self.size(), pos=self.pos()))
        self.settings.save_treeviewcols(self.get_treeviewcols())
        self.settings.save_options(self.options.get_options())
        self.settings.save_recent_documents(self.recent.get_documents())
        self.settings.sync()
        self.config.remove_loghandler(self.handler)
        if e is not None:
            e.accept()

    @QtCore.pyqtSlot()
    def on_actionAbout_triggered (self):
        """Display about dialog."""
        modules = u"<br>\n".join(configuration.get_modules_info())
        d = {
            "app": configuration.App,
            "appname": configuration.AppName,
            "copyright": configuration.HtmlCopyright,
            "donateurl": configuration.DonateUrl,
            "pyver": u"%d.%d.%d" % sys.version_info[:3],
            "modules": modules,
            "releasedate": configuration.ReleaseDate,
        }
        QtGui.QMessageBox.about(self, _(u"About %(appname)s") % d,
            _(u"""<qt><center>
<h1>%(app)s</h1>
<p>Released on %(releasedate)s
<p>Python: %(pyver)s<br>
%(modules)s
<p>%(copyright)s
<br>%(appname)s is licensed under the
<a href="http://www.gnu.org/licenses/gpl.html">GPL</a>
Version 2 or later.
<p>If you like %(appname)s, consider one of several ways to
<a href="%(donateurl)s">donate</a>. Thanks!
</center></qt>""") % d)

    @QtCore.pyqtSlot()
    def on_actionDonate_triggered (self):
        """Open donation URL."""
        webbrowser.open(configuration.DonateUrl)

    @QtCore.pyqtSlot()
    def on_actionDebug_triggered (self):
        """Display debug dialog."""
        self.debug.show()

    @QtCore.pyqtSlot()
    def on_actionSave_triggered (self):
        """Quit application."""
        urlsave(self, self.config, self.model.urls)

    @QtCore.pyqtSlot()
    def on_actionCheckUpdates_triggered (self):
        """Display update check result."""
        dialog = UpdateDialog(self)
        dialog.reset()
        dialog.show()

    def start (self):
        """Start a new check."""
        if self.status == Status.idle:
            self.check()

    on_urlinput_returnPressed = start

    def cancel (self):
        """Note that checking is canceled."""
        self.controlButton.setEnabled(False)
        self.set_statusmsg(_(u"Closing pending connections..."))

    @QtCore.pyqtSlot()
    def on_controlButton_clicked (self):
        """Start or Cancel has been clicked."""
        if self.status == Status.idle:
            self.start()
        elif self.status == Status.checking:
            self.cancel()
        else:
            raise ValueError("Invalid application status %r" % self.status)

    def get_url (self):
        """Return URL to check from the urlinput widget."""
        url = strformat.stripall(unicode(self.urlinput.text()))
        if url.startswith(u"www."):
            url = u"http://%s" % url
        elif url.startswith(u"ftp."):
            url = u"ftp://%s" % url
        elif url and u":" not in url:
            # Look for local file, else assume it's an HTTP URL.
            if not os.path.exists(url):
                url = u"http://%s" % url
        return url

    def check (self):
        """Check given URL."""
        self.model.clear()
        clear_properties(self)
        clear_statistics(self)
        self.set_config()
        aggregate = director.get_aggregate(self.config)
        url = self.get_url()
        if not url:
            self.set_statusmsg(_("Error, empty URL"))
            return
        self.set_statusmsg(_("Checking '%s'.") % strformat.limit(url, 40))
        url_data = checker.get_url_from(url, 0, aggregate)
        try:
            add_intern_pattern(url_data, self.config)
        except UnicodeError:
            self.set_statusmsg(_("Error, invalid URL `%s'.") %
                                  strformat.limit(url, 40))
            return
        self.recent.add_document(url)
        aggregate.urlqueue.put(url_data)
        self.aggregate = aggregate
        # check in background
        self.checker.check(self.aggregate)
        self.status = Status.checking

    def set_properties (self, selected, deselected):
        """Set URL properties for selected item."""
        indexes = selected.indexes()
        if len(indexes):
            index = indexes[0]
            urlitem = self.model.getUrlItem(index)
            if urlitem is not None:
                set_properties(self, urlitem.url_data)
        selected_rows = len(self.treeView.selectionModel().selectedRows())
        if selected_rows:
            self.set_statusmsg(_n("%d URL selected.", "%d URLs selected",
                               selected_rows) % selected_rows)
        else:
            self.set_statusmsg(_("Ready."))

    def on_treeView_customContextMenuRequested (self, point):
        """Show item context menu."""
        urlitem = self.model.getUrlItem(self.treeView.currentIndex())
        if urlitem is not None:
            self.contextmenu.enableFromItem(urlitem)
            self.contextmenu.popup(QtGui.QCursor.pos())

    @QtCore.pyqtSlot()
    def on_actionViewOnline_triggered (self):
        """View item URL online."""
        urlitem = self.model.getUrlItem(self.treeView.currentIndex())
        if urlitem is not None:
            webbrowser.open(urlitem.url_data.url)

    @QtCore.pyqtSlot()
    def on_actionViewParentOnline_triggered (self):
        """View item parent URL online."""
        urlitem = self.model.getUrlItem(self.treeView.currentIndex())
        if urlitem is not None:
            webbrowser.open(urlitem.url_data.parent_url)

    @QtCore.pyqtSlot()
    def on_actionViewParentSource_triggered (self):
        """View item parent URL source in local text editor (read-only)."""
        urlitem = self.model.getUrlItem(self.treeView.currentIndex())
        if urlitem is not None:
            self.view_source(urlitem.url_data.parent_url,
                             urlitem.url_data.line, urlitem.url_data.column)

    def view_source (self, url, line, col):
        """View URL source in editor window."""
        self.editor.setWindowTitle(u"View %s" % url)
        self.editor.setUrl(url)
        info, data = urlutil.get_content(url, proxy=self.config["proxy"])
        if (info, data) == (None, None):
            self.editor.setText(u"An error occurred retreiving URL `%s'." % url)
        else:
            content_type = httpheaders.get_content_type(info)
            if not content_type:
                # read function for content type guessing
                read = lambda: data
                content_type = fileutil.guess_mimetype(url, read=read)
            self.editor.setContentType(content_type)
            self.editor.setText(data, line=line, col=col)
        self.editor.show()

    @QtCore.pyqtSlot()
    def on_actionCopyToClipboard_triggered (self):
        """Copy item URL to clipboard."""
        urlitem = self.model.getUrlItem(self.treeView.currentIndex())
        if urlitem:
            clipboard = QtGui.QApplication.clipboard()
            clipboard.setText(urlitem.url_data.url)
            event = QtCore.QEvent(QtCore.QEvent.Clipboard)
            QtGui.QApplication.sendEvent(clipboard, event)

    def set_statusmsg (self, msg):
        """Show given status message."""
        if len(msg) > 30:
            self.label_status.setToolTip(msg)
            msg = msg[:27]+u"..."
        self.label_status.setText(msg)

    def log_status (self, checked, in_progress, queued, duration):
        """Update number of checked, active and queued URLs."""
        self.label_checked.setText(u"%d" % checked)
        self.label_active.setText(u"%d" % in_progress)
        self.label_queued.setText(u"%d" % queued)

    def log_stats (self, statistics):
        """Set statistic information for selected URL."""
        set_statistics(self, statistics)

    def internal_error (self, msg):
        """Display internal error message. Triggered by sys.excepthook()."""
        QtGui.QMessageBox.warning(self, _(u"LinkChecker internal error"), msg)
