# -----------------------------------------------------------------------
# Copyright (c) 2009  Jendrik Seipp
#
# RedNotebook 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.
#
# RedNotebook 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 RedNotebook; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# -----------------------------------------------------------------------

import datetime
import logging
import os

from gi.repository import GObject, Gtk

from rednotebook.gui import customwidgets
from rednotebook.gui.customwidgets import (
    Assistant,
    AssistantPage,
    Calendar,
    PathChooserPage,
    RadioButtonPage,
)
from rednotebook.util import dates, filesystem, markup


class DatePage(AssistantPage):
    def __init__(self, journal, *args, **kwargs):
        AssistantPage.__init__(self, *args, **kwargs)

        self.journal = journal

        self.all_days_button = Gtk.RadioButton(label=_("Export all days"))
        self.selected_text_button = Gtk.RadioButton(group=self.all_days_button)
        self.one_day_button = Gtk.RadioButton(
            label=_("Export currently visible day"), group=self.all_days_button
        )
        self.sel_days_button = Gtk.RadioButton(
            label=_("Export days in the selected time range"),
            group=self.all_days_button,
        )

        self.pack_start(self.all_days_button, False, False, 0)
        self.pack_start(self.one_day_button, False, False, 0)
        self.pack_start(self.selected_text_button, False, False, 0)
        self.pack_start(self.sel_days_button, False, False, 0)

        label1 = Gtk.Label()
        label1.set_markup("<b>" + _("From:") + "</b>")
        label2 = Gtk.Label()
        label2.set_markup("<b>" + _("To:") + "</b>")

        show_week_numbers = self.journal.config.read("weekNumbers")
        self.calendar1 = Calendar(week_numbers=show_week_numbers)
        self.calendar2 = Calendar(week_numbers=show_week_numbers)

        vbox1 = Gtk.VBox()
        vbox2 = Gtk.VBox()
        vbox1.pack_start(label1, False, False, 0)
        vbox1.pack_start(self.calendar1, True, True, 0)
        vbox2.pack_start(label2, False, False, 0)
        vbox2.pack_start(self.calendar2, True, True, 0)

        hbox = Gtk.HBox()
        hbox.pack_start(vbox1, True, True, 0)
        hbox.pack_start(vbox2, True, True, 0)
        self.pack_start(hbox, True, True, 0)

        self.sel_days_button.connect("toggled", self._on_select_days_toggled)

        self.all_days_button.set_active(True)
        self._set_select_days(False)

    def _on_select_days_toggled(self, button):
        select = self.sel_days_button.get_active()
        self._set_select_days(select)

    def _set_select_days(self, sensitive):
        self.calendar1.set_sensitive(sensitive)
        self.calendar2.set_sensitive(sensitive)
        self.select_days = sensitive

    def export_all_days(self):
        return self.all_days_button.get_active()

    def export_selected_text(self):
        return self.selected_text_button.get_active()

    def get_date_range(self):
        if self.select_days:
            return (self.calendar1.get_date(), self.calendar2.get_date())
        return (self.journal.day.date,) * 2

    def refresh_dates(self):
        self.calendar1.set_date(datetime.date.today())
        self.calendar2.set_date(datetime.date.today())

    def prepare(self):
        selected_text_label = _("Export currently selected text")
        self.selected_text = self.journal.frame.day_text_field.get_selected_text()
        enable_selected_text_button = bool(
            self.selected_text and not self.journal.frame.preview_mode
        )
        self.selected_text_button.set_sensitive(enable_selected_text_button)
        if enable_selected_text_button:
            self.selected_text_button.set_label(selected_text_label)
        else:
            self.selected_text_button.set_label(
                selected_text_label
                + " "
                + _("(Only available when text is selected in edit mode)")
            )
            if self.selected_text_button.get_active():
                self.selected_text_button.set_active(False)
                self.all_days_button.set_active(True)


class ContentsPage(AssistantPage):
    def __init__(self, journal, assistant, *args, **kwargs):
        AssistantPage.__init__(self, *args, **kwargs)

        self.journal = journal
        self.assistant = assistant

        self.text_and_tags_button = Gtk.RadioButton(label=_("Export text and tags"))
        self.text_only_button = Gtk.RadioButton(
            label=_("Export text only"), group=self.text_and_tags_button
        )
        self.tags_only_button = Gtk.RadioButton(
            label=_("Export tags only"), group=self.text_and_tags_button
        )
        self.filter_tags_button = Gtk.CheckButton(label=_("Filter days by tags"))

        self.pack_start(self.text_and_tags_button, False, False, 0)
        self.pack_start(self.text_only_button, False, False, 0)
        self.pack_start(self.tags_only_button, False, False, 0)
        self.pack_start(Gtk.HSeparator(), False, False, 0)
        self.pack_start(self.filter_tags_button, False, False, 0)

        self.available_categories = customwidgets.CustomListView(
            [(_("Available tags"), str)]
        )
        self.selected_categories = customwidgets.CustomListView(
            [(_("Selected tags"), str)]
        )

        left_scroll = Gtk.ScrolledWindow()
        left_scroll.add(self.available_categories)

        right_scroll = Gtk.ScrolledWindow()
        right_scroll.add(self.selected_categories)

        self.select_button = Gtk.Button(_("Select") + " >>")
        self.deselect_button = Gtk.Button("<< " + _("Deselect"))

        self.select_button.connect("clicked", self.on_select_category)
        self.deselect_button.connect("clicked", self.on_deselect_category)

        centered_vbox = Gtk.VBox()
        centered_vbox.pack_start(self.select_button, True, False, 0)
        centered_vbox.pack_start(self.deselect_button, True, False, 0)

        vbox = Gtk.VBox()
        vbox.pack_start(centered_vbox, True, False, 0)

        hbox = Gtk.HBox()
        hbox.pack_start(left_scroll, True, True, 0)
        hbox.pack_start(vbox, False, False, 0)
        hbox.pack_start(right_scroll, True, True, 0)
        self.pack_start(hbox, True, True, 0)

        self.error_text = Gtk.Label(label="")
        self.error_text.set_alignment(0.0, 0.5)

        self.pack_end(self.error_text, False, False, 0)

        self.text_and_tags_button.set_active(True)
        self.filter_tags_button.connect("toggled", self.check_selection)

    def refresh_categories_list(self):
        model_available = Gtk.ListStore(GObject.TYPE_STRING)
        for category in self.journal.categories:
            model_available.append([category])
        self.available_categories.set_model(model_available)

        model_selected = Gtk.ListStore(GObject.TYPE_STRING)
        self.selected_categories.set_model(model_selected)

    def on_select_category(self, widget):
        selection = self.available_categories.get_selection()
        _, selected_iter = selection.get_selected()

        if selected_iter is not None:
            model_available = self.available_categories.get_model()
            model_selected = self.selected_categories.get_model()

            row = model_available[selected_iter]

            new_row = model_selected.insert(0)
            model_selected.set(new_row, 0, row[0])

            model_available.remove(selected_iter)

        self.check_selection()

    def on_deselect_category(self, widget):
        selection = self.selected_categories.get_selection()
        _, selected_iter = selection.get_selected()

        if selected_iter is not None:
            model_available = self.available_categories.get_model()
            model_selected = self.selected_categories.get_model()

            row = model_selected[selected_iter]

            new_row = model_available.insert(0)
            model_available.set(new_row, 0, row[0])

            model_selected.remove(selected_iter)

        self.check_selection()

    def set_error_text(self, text):
        self.error_text.set_markup("<b>" + text + "</b>")

    def is_text_included(self):
        return (
            self.text_only_button.get_active() or self.text_and_tags_button.get_active()
        )

    def is_tags_included(self):
        return (
            self.tags_only_button.get_active() or self.text_and_tags_button.get_active()
        )

    def is_filtered(self):
        return self.filter_tags_button.get_active()

    def get_categories(self):
        if not self.filter_tags_button.get_active():
            return self.journal.categories
        else:
            selected_categories = []
            model_selected = self.selected_categories.get_model()

            for row in model_selected:
                selected_categories.append(row[0])

            return selected_categories

    def check_selection(self, *args):
        if self.is_filtered() and not self.get_categories():
            error = _("When filtering by tags, you have to select at least one tag.")
            self.set_error_text(error)
            correct = False
        else:
            self.set_error_text("")
            correct = True

        select = self.filter_tags_button.get_active()
        self.available_categories.set_sensitive(select)
        self.selected_categories.set_sensitive(select)
        self.select_button.set_sensitive(select)
        self.deselect_button.set_sensitive(select)

        self.assistant.set_page_complete(self.assistant.page3, correct)


class SummaryPage(AssistantPage):
    def __init__(self, *args, **kwargs):
        AssistantPage.__init__(self, *args, **kwargs)

        self.settings = []

    def prepare(self):
        text = _("You have selected the following settings:")
        self.set_header(text)
        self.clear()

    def add_setting(self, setting, value):
        label = Gtk.Label()
        label.set_markup(f"<b>{setting}:</b> {value}")
        label.set_alignment(0.0, 0.5)
        label.show()
        self.pack_start(label, False, False, 0)
        self.settings.append(label)

    def clear(self):
        for setting in self.settings:
            self.remove(setting)
        self.settings = []


class ExportAssistant(Assistant):
    def __init__(self, *args, **kwargs):
        Assistant.__init__(self, *args, **kwargs)
        self.set_modal(True)

        self.exporters = get_exporters()

        self.set_title(_("Export Assistant"))

        def add_space():
            self.page1.pack_start(Gtk.Label(""), False, False, 0)

        self.page1 = RadioButtonPage()
        text = "\n".join(
            [
                _("Welcome to the Export Assistant."),
                _(
                    "This wizard will help you to export your journal to various formats."
                ),
                _(
                    "You can select the days you want to export and where the output will be saved."
                ),
            ]
        )
        welcome_label = Gtk.Label(text)
        self.page1.pack_start(welcome_label, False, False, 0)
        add_space()
        for exporter in self.exporters:
            name = exporter.NAME
            desc = exporter.DESCRIPTION
            self.page1.add_radio_option(exporter, name, desc)
        add_space()
        pdf_label = Gtk.Label(
            _("PDF: export to HTML, open in browser and print to PDF file")
        )
        pdf_label.set_halign(Gtk.Align.START)
        self.page1.pack_start(pdf_label, False, False, 0)
        self.append_page(self.page1)
        self.set_page_title(self.page1, _("Select Export Format") + " (1/5)")
        self.set_page_complete(self.page1, True)

        self.page2 = DatePage(self.journal)
        self.append_page(self.page2)
        self.set_page_title(self.page2, _("Select Date Range") + " (2/5)")
        self.set_page_complete(self.page2, True)

        self.page3 = ContentsPage(self.journal, self)
        self.append_page(self.page3)
        self.set_page_title(self.page3, _("Select Contents") + " (3/5)")
        self.set_page_complete(self.page3, True)
        self.page3.check_selection()

        self.page4 = PathChooserPage(self)
        self.append_page(self.page4)
        self.set_page_title(self.page4, _("Select Export Path") + " (4/5)")
        self.set_page_complete(self.page4, True)

        self.page5 = SummaryPage()
        self.append_page(self.page5)
        self.set_page_title(self.page5, _("Summary") + " (5/5)")
        self.set_page_type(self.page5, Gtk.AssistantPageType.CONFIRM)
        self.set_page_complete(self.page5, True)

        self.exporter = None
        self.path = None
        self.set_forward_page_func(self.pageforward)

    def pageforward(self, page):
        if page == 2 and self.page2.export_selected_text():
            return 4
        else:
            return page + 1

    def run(self):
        self.page2.refresh_dates()
        self.page3.refresh_categories_list()
        self.show_all()

    def _on_close(self, assistant):
        """
        Do the export
        """
        self.hide()
        self.export()

    def _on_prepare(self, assistant, page):
        """
        Called when a new page should be prepared, before it is shown
        """
        if page == self.page2:
            # Date Range
            self.exporter = self.page1.get_selected_object()
            self.page2.prepare()
        elif page == self.page3:
            # Categories
            start_date, end_date = self.page2.get_date_range()
            if not self.page2.export_all_days() and start_date == end_date:
                self.page3.filter_tags_button.set_active(False)
                self.page3.filter_tags_button.set_sensitive(False)
            else:
                self.page3.filter_tags_button.set_sensitive(True)
        elif page == self.page4:
            # Path
            self.page4.prepare(self.exporter)
        elif page == self.page5:
            # Summary
            self.path = self.page4.get_selected_path()
            self.page5.prepare()
            self.export_all_days = self.page2.export_all_days()
            self.export_selected_text = self.page2.export_selected_text()
            self.is_filtered = self.page3.is_filtered()
            self.exported_categories = self.page3.get_categories()

            self.page5.add_setting(_("Format"), self.exporter.NAME)
            self.page5.add_setting(
                _("Export all days"), self.yes_no(self.export_all_days)
            )
            if not self.export_all_days:
                start_date, end_date = self.page2.get_date_range()
                if start_date == end_date:
                    self.page5.add_setting(_("Date"), start_date)
                    self.page5.add_setting(
                        _("Export selected text only"),
                        self.yes_no(self.export_selected_text),
                    )
                else:
                    self.page5.add_setting(_("Start date"), start_date)
                    self.page5.add_setting(_("End date"), end_date)
            if self.export_selected_text:
                self.exported_categories = []
            else:
                self.page5.add_setting(
                    _("Include text"), self.yes_no(self.page3.is_text_included())
                )
                self.page5.add_setting(
                    _("Include tags"), self.yes_no(self.page3.is_tags_included())
                )
            if self.is_filtered:
                self.page5.add_setting(
                    _("Filtered by tags"), ", ".join(self.exported_categories)
                )
            self.page5.add_setting(_("Export path"), self.path)

    def yes_no(self, value):
        return _("Yes") if value else _("No")

    def get_export_string(self, target):
        if self.export_selected_text and self.page2.selected_text:
            markup_string = self.page2.selected_text
        else:
            if self.export_all_days:
                export_days = self.journal.days
            else:
                export_days = self.journal.get_days_in_date_range(
                    *self.page2.get_date_range()
                )

            selected_categories = self.exported_categories
            logging.debug("Selected Categories for Inclusion: %s" % selected_categories)

            markup_strings_for_each_day = []
            for day in export_days:
                include_day = True
                if self.is_filtered:
                    include_day = False
                    category_pairs = day.get_category_content_pairs()
                    for category in selected_categories:
                        if category in category_pairs:
                            include_day = True
                if include_day:
                    date_format = self.journal.config.read("exportDateFormat")
                    date_string = dates.format_date(date_format, day.date)
                    day_markup = markup.get_markup_for_day(
                        day,
                        target,
                        with_text=self.page3.is_text_included(),
                        with_tags=self.page3.is_tags_included(),
                        categories=selected_categories,
                        date=date_string,
                    )
                    markup_strings_for_each_day.append(day_markup)

            markup_string = "".join(markup_strings_for_each_day)

        return self.journal.convert(markup_string, target, options={"toc": 0})

    def export(self):
        format = self.exporter.FORMAT
        export_string = self.get_export_string(format)
        filesystem.write_file(self.path, export_string)
        self.journal.show_message(_("Content exported to %s") % self.path)


class Exporter:
    NAME = "Which format do we use?"
    # Short description of how we export
    DESCRIPTION = ""
    # Export destination
    PATHTEXT = ""
    PATHTYPE = "NEWFILE"
    EXTENSION = None

    @classmethod
    def is_available(_cls):
        """
        This function should be implemented by the subclasses that may
        not be available

        If their requirements are not met, they return False
        """
        return True

    def export(self):
        """
        This function has to be implemented by all subclasses

        It should *yield* ImportDay objects
        """

    @property
    def DEFAULTPATH(self):
        return os.path.join(
            os.path.expanduser("~"),
            f"RedNotebook-Export_{datetime.date.today()}.{self.EXTENSION}",
        )


class PlainTextExporter(Exporter):
    NAME = _("Plain Text")
    EXTENSION = "txt"
    FORMAT = "txt"


class HtmlExporter(Exporter):
    NAME = "HTML"
    EXTENSION = "html"
    FORMAT = "xhtml"


class LatexExporter(Exporter):
    NAME = "Latex"
    EXTENSION = "tex"
    FORMAT = "tex"


def get_exporters():
    exporters = [PlainTextExporter, HtmlExporter, LatexExporter]

    # Instantiate exporters
    return [exporter() for exporter in exporters]
