from gettext import gettext as _
import os
import logging
import time

from gi.repository import GObject
from gi.repository import Gtk
from gi.repository import Gdk

from gi.repository import EvinceDocument
from gi.repository import EvinceView

from sugar3 import profile
from sugar3.activity.activity import get_activity_root, show_object_in_journal
from sugar3.datastore import datastore

_logger = logging.getLogger('read-activity')


class EvinceViewer():

    def __init__(self):
        self._view_notify_zoom_handler = None
        EvinceDocument.init()
        self._view = EvinceView.View()

    def setup(self, activity):
        self._activity = activity
        self._view.connect('selection-changed',
                           activity._view_selection_changed_cb)
        self._view.connect('external-link', self.__handle_link_cb)

        activity._scrolled = Gtk.ScrolledWindow()
        activity._scrolled.set_policy(Gtk.PolicyType.AUTOMATIC,
                                      Gtk.PolicyType.AUTOMATIC)
        activity._scrolled.props.shadow_type = Gtk.ShadowType.NONE

        activity._scrolled.add(self._view)
        self._view.show()

        self._view.set_events(self._view.get_events() |
                              Gdk.EventMask.TOUCH_MASK)
        self._view.connect('event', self.__view_touch_event_cb)

        activity._hbox.pack_start(activity._scrolled, True, True, 0)
        activity._scrolled.show()

        self.dpi = activity.dpi

    def load_document(self, file_path):
        try:
            self._document = \
                EvinceDocument.Document.factory_get_document(file_path)
        except GObject.GError, e:
            _logger.error('Can not load document: %s', e)
            return
        else:
            self._model = EvinceView.DocumentModel()
            self._model.set_document(self._document)
            self._view.set_model(self._model)

            # set dpi
            # TODO why we need set this?
            """
            min_scale = self._model.get_min_scale()
            max_scale = self._model.get_max_scale()
            logging.error("min scale %s max_scale %s", min_scale, max_scale)
            logging.error("setting min scale %s", min_scale * self.dpi / 72.0)
            logging.error("setting max scale %s", max_scale * self.dpi / 72.0)
            self._model.set_min_scale(min_scale * self.dpi / 72.0)
            self._model.set_max_scale(max_scale * self.dpi / 72.0)
            """

    def __view_touch_event_cb(self, widget, event):
        if event.type == Gdk.EventType.TOUCH_BEGIN:
            x = event.touch.x
            view_width = widget.get_allocation().width
            if x > view_width * 3 / 4:
                self._view.scroll(Gtk.ScrollType.PAGE_FORWARD, False)
            elif x < view_width * 1 / 4:
                self._view.scroll(Gtk.ScrollType.PAGE_BACKWARD, False)

    def __handle_link_cb(self, widget, url_object):
        url = url_object.get_uri()
        logging.debug('Create journal entry for URL: %s', url)
        jobject = datastore.create()
        metadata = {
            'title': "%s: %s" % (_('URL from Read'), url),
            'title_set_by_user': '1',
            'icon-color': profile.get_color().to_string(),
            'mime_type': 'text/uri-list', }

        for k, v in metadata.items():
            jobject.metadata[k] = v
        file_path = os.path.join(get_activity_root(),
                                 'instance', '%i_' % time.time())
        open(file_path, 'w').write(url + '\r\n')
        os.chmod(file_path, 0755)
        jobject.set_file_path(file_path)
        datastore.write(jobject)
        show_object_in_journal(jobject.object_id)
        jobject.destroy()
        os.unlink(file_path)

    def get_current_page(self):
        return self._model.props.page

    def set_current_page(self, page):
        if page >= self._document.get_n_pages():
            page = self._document.get_n_pages() - 1
        elif page < 0:
            page = 0
        self._model.props.page = page

    def next_page(self):
        self._view.next_page()

    def previous_page(self):
        self._view.previous_page()

    def rotate_left(self):
        rotation = self._model.get_rotation()
        self._model.set_rotation(rotation - 90)

    def rotate_right(self):
        rotation = self._model.get_rotation()
        self._model.set_rotation(rotation + 90)

    def can_rotate(self):
        return True

    def get_pagecount(self):
        '''
        Returns the pagecount of the loaded file
        '''
        return self._document.get_n_pages()

    def load_metadata(self, activity):

        self.metadata = activity.metadata

        if not self.metadata['title_set_by_user'] == '1':
            title = self._document.get_title()
            if title:
                self.metadata['title'] = title

        sizing_mode = self.metadata.get('Read_sizing_mode', 'fit-width')
        _logger.debug('Found sizing mode: %s', sizing_mode)
        if sizing_mode == "best-fit":
            self._model.set_sizing_mode(EvinceView.SizingMode.BEST_FIT)
            if hasattr(self._view, 'update_view_size'):
                self._view.update_view_size(self._scrolled)
        elif sizing_mode == "free":
            self._model.set_sizing_mode(EvinceView.SizingMode.FREE)
            self._model.set_scale(float(self.metadata.get('Read_zoom', '1.0')))
            _logger.debug('Set zoom to %f', self._model.props.scale)
        elif sizing_mode == "fit-width":
            self._model.set_sizing_mode(EvinceView.SizingMode.FIT_WIDTH)
            if hasattr(self._view, 'update_view_size'):
                self._view.update_view_size(self._scrolled)
        else:
            # this may happen when we get a document from a buddy with a later
            # version of Read, for example.
            _logger.warning("Unknown sizing_mode state '%s'", sizing_mode)
            if self.metadata.get('Read_zoom', None) is not None:
                self._model.set_scale(float(self.metadata['Read_zoom']))

    def update_metadata(self, activity):
        self.metadata = activity.metadata
        self.metadata['Read_zoom'] = str(self._model.props.scale)

        if self._model.get_sizing_mode() == EvinceView.SizingMode.BEST_FIT:
            self.metadata['Read_sizing_mode'] = "best-fit"
        elif self._model.get_sizing_mode() == EvinceView.SizingMode.FREE:
            self.metadata['Read_sizing_mode'] = "free"
        elif self._model.get_sizing_mode() == EvinceView.SizingMode.FIT_WIDTH:
            self.metadata['Read_sizing_mode'] = "fit-width"
        else:
            _logger.error("Don't know how to save sizing_mode state '%s'" %
                          self._model.get_sizing_mode())

    def can_highlight(self):
        return False

    def can_do_text_to_speech(self):
        return False

    def get_zoom(self):
        '''
        Returns the current zoom level
        '''
        return self._model.props.scale * 100

    def set_zoom(self, value):
        '''
        Sets the current zoom level
        '''
        self._model.props.sizing_mode = EvinceView.SizingMode.FREE

        if not self._view_notify_zoom_handler:
            return

        self._model.disconnect(self._view_notify_zoom_handler)
        try:
            self._model.props.scale = value / 100.0
        finally:
            self._view_notify_zoom_handler = self._model.connect(
                'notify::scale', self._zoom_handler)

    def zoom_in(self):
        '''
        Zooms in (increases zoom level by 0.1)
        '''
        self._model.props.sizing_mode = EvinceView.SizingMode.FREE
        self._view.zoom_in()

    def zoom_out(self):
        '''
        Zooms out (decreases zoom level by 0.1)
        '''
        self._model.props.sizing_mode = EvinceView.SizingMode.FREE
        self._view.zoom_out()

    def zoom_to_width(self):
        self._model.props.sizing_mode = EvinceView.SizingMode.FIT_WIDTH

    def can_zoom_in(self):
        '''
        Returns True if it is possible to zoom in further
        '''
        return self._view.can_zoom_in()

    def can_zoom_out(self):
        '''
        Returns True if it is possible to zoom out further
        '''
        return self._view.can_zoom_out()

    def can_zoom_to_width(self):
        return True

    def zoom_to_best_fit(self):
        self._model.props.sizing_mode = EvinceView.SizingMode.BEST_FIT

    def zoom_to_actual_size(self):
        self._model.props.sizing_mode = EvinceView.SizingMode.FREE
        self._model.props.scale = 1.0

    def connect_zoom_handler(self, handler):
        self._zoom_handler = handler
        self._view_notify_zoom_handler = \
            self._model.connect('notify::scale', handler)
        return self._view_notify_zoom_handler

    def setup_find_job(self, text, updated_cb):
        self._find_job = EvinceView.JobFind.new(
            document=self._document, start_page=0,
            n_pages=self._document.get_n_pages(),
            text=text, case_sensitive=False)
        self._find_updated_handler = self._find_job.connect('updated',
                                                            updated_cb)
        self._view.find_started(self._find_job)
        EvinceView.Job.scheduler_push_job(
            self._find_job, EvinceView.JobPriority.PRIORITY_NONE)
        return self._find_job, self._find_updated_handler

    def connect_page_changed_handler(self, handler):
        self._model.connect('page-changed', handler)

    def update_toc(self, activity):
        if self._validate_min_version(3, 5, 92):
            # check version because does not work and crash with older evince
            doc = self._model.get_document()
            if not doc.has_document_links():
                logging.error('The pdf file does not have a index')
                return False
            else:
                self._job_links = EvinceView.JobLinks.new(document=doc)
                self._job_links.connect('finished', self.__index_loaded_cb,
                                        activity)
                EvinceView.Job.scheduler_push_job(
                    self._job_links,
                    EvinceView.JobPriority.PRIORITY_NONE)
                return True
        else:
            return False

    def handle_link(self, link):
        self._view.handle_link(link)

    def _validate_min_version(self, major, minor, micro):
        """
        Check if Evince version is at major or equal than the requested
        """
        evince_version = [EvinceDocument.MAJOR_VERSION,
                          EvinceDocument.MINOR_VERSION,
                          EvinceDocument.MICRO_VERSION]
        return evince_version >= [major, minor, micro]

    def __index_loaded_cb(self, job, activity):
        self._index_model = job.get_model()
        if job.get_model() is None:
            return False

        activity.show_navigator_button()
        activity.set_navigator_model(self._index_model)
        return True

    def get_current_link(self):
        _iter = self._index_model.get_iter_first()
        link_found = ""
        current_page = self._model.props.page
        while True:
            link = self._index_model.get_value(_iter, 1)
            if self._document.get_link_page(link) > current_page:
                break
            else:
                link_found = link
                _iter = self._index_model.iter_next(_iter)
                if _iter is None:
                    break
        return link_found

    def get_link_iter(self, link):
        _iter = self._index_model.get_iter_first()
        while True:
            value = self._index_model.get_value(_iter, 1)
            if value == link:
                break
            else:
                _iter = self._index_model.iter_next(_iter)
                if _iter is None:
                    break
        return _iter

    def find_set_highlight_search(self, set_highlight_search):
        self._view.find_set_highlight_search(set_highlight_search)

    def find_next(self):
        '''
        Highlights the next matching item for current search
        '''
        self._view.find_next()

    def find_previous(self):
        '''
        Highlights the previous matching item for current search
        '''
        self._view.find_previous()

    def find_changed(self, job, page=None):
        pass

    def scroll(self, scrolltype, horizontal):
        '''
        Scrolls through the pages.
        Scrolling is horizontal if horizontal is set to True
        Valid scrolltypes are:
        Gtk.ScrollType.PAGE_BACKWARD, Gtk.ScrollType.PAGE_FORWARD,
        Gtk.ScrollType.STEP_BACKWARD, Gtk.ScrollType.STEP_FORWARD,
        Gtk.ScrollType.START and Gtk.ScrollType.END
        '''
        _logger.error('scroll: %s', scrolltype)

        if scrolltype == Gtk.ScrollType.PAGE_BACKWARD:
            self._view.scroll(Gtk.ScrollType.PAGE_BACKWARD, horizontal)
        elif scrolltype == Gtk.ScrollType.PAGE_FORWARD:
            self._view.scroll(Gtk.ScrollType.PAGE_FORWARD, horizontal)
        elif scrolltype == Gtk.ScrollType.STEP_BACKWARD:
            self._scroll_step(False, horizontal)
        elif scrolltype == Gtk.ScrollType.STEP_FORWARD:
            self._scroll_step(True, horizontal)
        elif scrolltype == Gtk.ScrollType.START:
            self.set_current_page(0)
        elif scrolltype == Gtk.ScrollType.END:
            self.set_current_page(self._document.get_n_pages())
        else:
            print ('Got unsupported scrolltype %s' % str(scrolltype))

    def _scroll_step(self, forward, horizontal):
        if horizontal:
            adj = self._activity._scrolled.get_hadjustment()
        else:
            adj = self._activity._scrolled.get_vadjustment()
        value = adj.get_value()
        step = adj.get_step_increment()
        if forward:
            adj.set_value(value + step)
        else:
            adj.set_value(value - step)

    def copy(self):
        self._view.copy()
