# -----------------------------------------------------------------------
# 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.
# -----------------------------------------------------------------------

from collections import defaultdict
import datetime
import itertools
import locale
import logging
import os
import sys


# Use basic stdout logging before we can initialize logging correctly.
logging.basicConfig(
    level=logging.DEBUG, format="%(levelname)-8s %(message)s", stream=sys.stdout
)

try:
    import gi
except ImportError as err:
    logging.error(
        'pygobject could not be imported: "{}". Please install it (python3-gi).'.format(
            err
        )
    )
    sys.exit(1)

try:
    gi.require_version("Gtk", "3.0")
except ValueError as err:
    logging.error(err)
    sys.exit("Please install GTK (gir1.2-gtk-3.0).")

try:
    gi.require_version("GtkSource", "4")
    logging.info("Using GtkSourceView 4")
except ValueError:
    try:
        gi.require_version("GtkSource", "3.0")
        logging.info("Using GtkSourceView 3.0")
    except ValueError:
        sys.exit(
            "Please install GtkSource (gir1.2-gtksource-3.0 or gir1.2-gtksource-4)."
        )


if hasattr(sys, "frozen"):
    base_dir = sys._MEIPASS
else:
    app_dir = os.path.dirname(os.path.abspath(__file__))
    base_dir = os.path.dirname(app_dir)

print(f"Adding {base_dir} to sys.path")
sys.path.insert(0, base_dir)

from rednotebook.util import filesystem


# ---------------------- Enable i18n -------------------------------

from rednotebook.external import elibintl

LOCALE_PATH = filesystem.locale_dir
logging.info(f"Locale path: {LOCALE_PATH}")

GETTEXT_DOMAIN = "rednotebook"

"""
On Windows, translations currently only work with a hack. We need to
translate

  1) Strings in source code.
  2) GTK stock items.
  3) Strings in the Glade file.

1) works fine. For 3) we need a workaround in main_window.py. If we
initialize libintl with elibintl, the translations for 2) stop working.
Without the workaround we need to initialize libintl to avoid UTF-8
encoding errors.

When the problem is fixed upstream, we can pass libintl='libintl-8.dll'
to elibintl. See also

https://bugzilla.gnome.org/show_bug.cgi?id=574520
https://bugzilla.gnome.org/show_bug.cgi?id=753991
https://github.com/tobias47n9e/pygobject-locale
https://sourceforge.net/p/pygobjectwin32/tickets/27/

"""

elibintl.install(GETTEXT_DOMAIN, LOCALE_PATH, libintl=None)

# ------------------- end Enable i18n -------------------------------


from rednotebook.util import utils
from rednotebook.util import markup
from rednotebook.help import example_content
from rednotebook import info
from rednotebook import configuration
from rednotebook import data


args = info.get_commandline_parser().parse_args()

# ---------------------- Enable logging -------------------------------


def setup_logging(log_file):
    file_logging_stream = open(log_file, "w")

    # We want to have all stdout and stderr messages in the logfile.
    # In the frozen version we cannot log to sys.stderr because it's
    # broken on windows. Stdout doesn't work either it seems.
    stderr_streams = [file_logging_stream]
    stdout_streams = [file_logging_stream]
    if not filesystem.main_is_frozen():
        stderr_streams.append(sys.__stderr__)
        stdout_streams.append(sys.__stdout__)
    sys.stderr = utils.StreamDuplicator(stderr_streams)
    sys.stdout = utils.StreamDuplicator(stdout_streams)

    root_logger = logging.getLogger("")
    root_logger.setLevel(logging.DEBUG)

    # Python adds a default handler if some log is generated before here
    # Remove all handlers that have been added automatically
    for handler in root_logger.handlers:
        root_logger.removeHandler(handler)

    # define a Handler which writes messages to sys.stdout
    console = logging.StreamHandler(sys.stdout)
    console.setLevel(logging.DEBUG)
    # set a format which is simpler for console use
    formatter = logging.Formatter("%(asctime)s %(levelname)-8s %(message)s")
    # tell the handler to use this format
    console.setFormatter(formatter)
    # add the handler to the root logger
    root_logger.addHandler(console)

    logging.info('Writing log to file "%s"' % log_file)


default_config_file = os.path.join(filesystem.app_dir, "files", "default.cfg")
default_config = configuration.Config(default_config_file)

dirs = filesystem.Filenames(default_config)
setup_logging(dirs.log_file)

# ------------------ end Enable logging -------------------------------

logging.info("System encoding: %s" % filesystem.ENCODING)
logging.info("Language code: %s" % filesystem.LANGUAGE)

try:
    import enchant

    logging.info(f"Spell checking languages: {enchant.list_languages()}")
    logging.info(f"Spell checking dictionaries: {enchant.list_dicts()}")
except ImportError:
    pass

try:
    from gi.repository import Gtk
    from gi.repository import Gio
    from gi.repository import GLib
except (ImportError, AssertionError) as e:
    logging.error(e)
    logging.error("GTK not found. Please install it (gir1.2-gtk-3.0).")
    sys.exit(1)


from rednotebook.util import dates
from rednotebook import backup

from rednotebook.util.statistics import Statistics
from rednotebook.gui.main_window import MainWindow
from rednotebook import storage
from rednotebook.data import Month


class Journal(Gtk.Application):
    def __init__(self, *args, **kwargs):
        super().__init__(
            *args,
            application_id="app.rednotebook.RedNotebook",
            flags=Gio.ApplicationFlags.HANDLES_COMMAND_LINE,
            **kwargs,
        )
        # Let components check if the MainWindow has been created.
        self.frame = None

    def do_startup(self):
        Gtk.Application.do_startup(self)

        self.dirs = dirs

        user_config = configuration.Config(self.dirs.config_file)
        # Apply defaults where no custom values have been set
        for key, value in default_config.items():
            if key not in user_config:
                user_config[key] = value
        self.config = user_config
        self.config.save_state()

        logging.info("Running in portable mode: %s" % self.dirs.portable)

        self.month = None
        self.date = None
        self.months = {}

        # The dir name is the title
        self.title = ""

        # show instructions at first start
        self.is_first_start = self.config.read("firstStart")
        self.config["firstStart"] = 0
        logging.info("First Start: %s" % bool(self.is_first_start))

        logging.info("RedNotebook version: %s" % info.version)
        logging.info(filesystem.get_platform_info())

        self.actual_date = self.get_start_date()

        self.do_activate()

        journal_path = self.get_journal_path()
        if not self.dirs.is_valid_journal_path(journal_path):
            logging.error(
                "Invalid directory: %s. Using default journal." % journal_path
            )
            self.show_message(
                _("You cannot use this directory for your journal:")
                + " %s" % journal_path
                + ". "
                + _("Opening default journal."),
                error=True,
            )
            journal_path = self.dirs.default_data_dir
        self.open_journal(journal_path)

        self.archiver = backup.Archiver(self)
        GLib.idle_add(self.archiver.check_last_backup_date)

        # Check for a new version
        if self.config.read("checkForNewVersion") == 1:
            utils.check_new_version(self, info.version, startup=True)

        # Automatically save the content after a period of time
        GLib.timeout_add_seconds(600, self.save_to_disk)

    def do_activate(self):
        if not self.frame:
            self.frame = MainWindow(self)
        self.frame.main_frame.present()

    def do_command_line(self, _command_line):
        # Arguments are parsed elsewhere, so we only show the window here.
        self.activate()
        return 0  # Must return a number.

    def get_journal_path(self):
        """
        Retrieve the path from optional args or return standard value if args
        not present
        """
        if not args.journal:
            data_dir = self.config.read("dataDir", self.dirs.data_dir)
            if not os.path.isabs(data_dir):
                data_dir = os.path.join(self.dirs.app_dir, data_dir)
                data_dir = os.path.normpath(data_dir)
            return data_dir

        # path_arg can be e.g. data (under .rednotebook), data (elsewhere),
        # or an absolute path /home/username/myjournal
        # Try to find the journal under the standard location or at the given
        # absolute or relative location
        path_arg = args.journal

        logging.debug('Trying to find journal "%s"' % path_arg)

        paths_to_check = [path_arg, os.path.join(self.dirs.journal_user_dir, path_arg)]

        for path in paths_to_check:
            if os.path.exists(path):
                if os.path.isdir(path):
                    return path
                else:
                    logging.warning(
                        "To open a journal you must specify a " "directory, not a file."
                    )

        logging.error(
            'The path "%s" is not a valid journal directory. '
            'Execute "rednotebook -h" for instructions' % path_arg
        )
        sys.exit(2)

    def get_start_date(self):
        """
        Retrieve the date from optional args or otherwise return 'today'
        """
        if not args.start_date:
            return datetime.date.today()

        try:
            return dates.get_date_from_date_string(args.start_date)
        except ValueError:
            logging.error(
                "Invalid date: %s (required format: YYYY-MM-DD)." % args.start_date
            )
            sys.exit(2)

    def exit(self):
        self.frame.add_values_to_config()

        # Make it possible to stop the program from exiting
        # e.g. if the journal could not be saved
        self.is_allowed_to_exit = True
        self.save_to_disk(exit_imminent=True)

        if self.is_allowed_to_exit:
            logging.info("Goodbye!")
            # Informs the logging system to perform an orderly shutdown by
            # flushing and closing all handlers.
            logging.shutdown()
            self.quit()

    def convert(self, text, target, headers=None, options=None, use_gtk_theme=False):
        options = options or {}
        options["font"] = self.config.read("previewFont")
        if use_gtk_theme:
            bgcolor, fgcolor = utils.get_gtk_colors(
                self.frame.day_text_field.day_text_view
            )
            options["bgcolor"] = bgcolor
            options["fgcolor"] = fgcolor
        return markup.convert(
            text, target, self.dirs.data_dir, headers=headers, options=options
        )

    def save_to_disk(self, exit_imminent=False, changing_journal=False, saveas=False):
        self.save_old_day()

        try:
            filesystem.make_directory(self.dirs.data_dir)
        except OSError as err:
            logging.error(f"Creating journal directory failed: {err}")
            self.frame.show_save_error_dialog(exit_imminent)
            return True

        try:
            something_saved = storage.save_months_to_disk(
                self.months, self.dirs.data_dir, exit_imminent, saveas
            )
        except OSError as err:
            logging.error(f"Saving month files failed: {err}")
            self.frame.show_save_error_dialog(exit_imminent)
            something_saved = None

        if something_saved:
            self.show_message(
                _("The content has been saved to %s") % self.dirs.data_dir, error=False
            )
            logging.info("The content has been saved to %r" % self.dirs.data_dir)
        elif something_saved is None:
            # Don't display this as an error, because we already show a dialog.
            self.show_message(_("The journal could not be saved"), error=False)
        else:
            self.show_message(_("Nothing to save"), error=False)

        self.config.save_to_disk()

        if not (exit_imminent or changing_journal) and something_saved:
            # Update cloud.
            self.frame.cloud.update(force_update=True)
            for tag in self.get_escaped_tags():
                self.frame.search_box.add_entry(tag)

        # tell gobject to keep saving the content in regular intervals
        return True

    def open_journal(self, data_dir):
        if not os.path.exists(data_dir):
            logging.warning(
                "The dir %s does not exist. Select a different dir." % data_dir
            )
            return

        if self.months:
            self.save_to_disk(changing_journal=True)

        logging.info("Opening journal at %r" % data_dir)
        self.dirs.data_dir = data_dir

        self.month = None
        self.months.clear()
        self.frame.search_box.clear()
        self.frame.day_text_field.clear_buffers()

        self.months = storage.load_all_months_from_disk(data_dir)

        # Nothing to save before first day change
        self.load_day(self.actual_date)

        if self.is_first_start and not os.listdir(data_dir) and not self.days:
            self.add_instruction_content()

        self.stats = Statistics(self)

        self.frame.cloud.update(force_update=True)

        self.frame.categories_tree_view.categories = self.categories
        self.frame.search_box.set_entries(self.get_escaped_tags())

        self.title = filesystem.get_journal_title(data_dir)

        # Set frame title
        self.set_frame_title()

        # Save the folder for next start
        if not self.dirs.portable:
            self.config["dataDir"] = data_dir
        else:
            rel_data_dir = filesystem.get_relative_path(self.dirs.app_dir, data_dir)
            self.config["dataDir"] = rel_data_dir

    def set_frame_title(self):
        parts = ["RedNotebook"]
        if self.title != "data":
            parts.append(self.title)
        parts.append(dates.format_date(self.config.read("exportDateFormat"), self.date))
        self.frame.main_frame.set_title(" - ".join(parts))

    def get_month(self, date):
        """
        Returns the corresponding month if it has previously been visited,
        otherwise a new month is created and returned
        """

        year_and_month = dates.get_year_and_month_from_date(date)

        # Selected month has not been loaded or created yet
        if year_and_month not in self.months:
            self.months[year_and_month] = Month(date.year, date.month)

        return self.months[year_and_month]

    def get_day(self, date):
        return self.get_month(date).get_day(date.day)

    def get_escaped_tags(self):
        return ["#%s" % data.escape_tag(tag) for tag in self.categories]

    def save_old_day(self):
        """Order is important"""
        old_content = self.day.content
        new_content = self.frame.categories_tree_view.get_day_content()
        new_content["text"] = self.frame.get_day_text()
        self.day.content = new_content

        content_changed = old_content != new_content
        if content_changed:
            self.month.edited = True

        self.frame.calendar.set_day_edited(self.date.day, not self.day.empty)

    def load_day(self, new_date):
        old_date = self.date
        self.date = new_date

        if not dates.same_month(new_date, old_date) or self.month is None:
            self.month = self.get_month(self.date)

        self.frame.set_date(self.month, self.date, self.day)

        self.set_frame_title()

    @property
    def day(self):
        return self.month.get_day(self.date.day)

    def change_date(self, new_date):
        if new_date < datetime.date(1900, 1, 1):
            self.show_message(
                "Only dates after 1900 are supported.", title="Too Early", error=True
            )
            return

        if new_date == self.date:
            return

        self.save_old_day()
        self.load_day(new_date)

    def go_to_next_day(self):
        next_date = self.date + dates.one_day
        following_edited_days = self.get_days_in_date_range(start_date=next_date)
        if following_edited_days:
            next_date = following_edited_days[0].date
        self.change_date(next_date)

    def go_to_prev_day(self):
        prev_date = self.date - dates.one_day
        previous_edited_days = self.get_days_in_date_range(end_date=prev_date)
        if previous_edited_days:
            prev_date = previous_edited_days[-1].date
        self.change_date(prev_date)

    def show_message(self, msg, title=None, error=False):
        if error and not title:
            title = _("Error")

        if error:
            msg_type = Gtk.MessageType.ERROR
            log_level = logging.ERROR
        else:
            msg_type = Gtk.MessageType.INFO
            log_level = logging.INFO

        self.frame.show_message(title, msg, msg_type)
        logging.log(log_level, f"{title}. {msg}" if title else msg)

    @property
    def categories(self):
        return sorted(
            set(itertools.chain.from_iterable(day.categories for day in self.days)),
            key=locale.strxfrm,
        )

    def get_entries(self, category):
        entries = set()
        for day in self.days:
            entries |= set(day.get_entries(category))
        return sorted(entries)

    def search(self, text, tags):
        results = []
        for day in reversed(self.get_days_with_tags(tags)):
            results.append(day.search(text, tags))
        return results

    def get_days_with_tags(self, tags):
        if not tags:
            return self.days
        days = []
        for day in self.days:
            day_tags = {data.escape_tag(tag) for tag in day.categories}
            if all(tag in day_tags for tag in tags):
                days.append(day)
        return days

    def get_word_count_dict(self):
        """
        Return a dictionary mapping the words to their number of appearance.
        """
        word_dict = defaultdict(int)
        for day in self.days:
            words = day.get_words()
            for word in words:
                word_dict[word.lower()] += 1
        return word_dict

    @property
    def days(self):
        """
        Returns all edited days ordered by their date
        """
        # The day being edited counts too
        if self.frame:
            self.save_old_day()

        days = []
        for month in self.months.values():
            # Filter out days without content.
            days_in_month = [day for day in month.days.values() if not day.empty]
            days.extend(days_in_month)

        # Sort days
        days = sorted(days, key=lambda day: day.date)
        return days

    def get_days_in_date_range(self, start_date=None, end_date=None):
        if not start_date:
            start_date = datetime.date.min
        if not end_date:
            end_date = datetime.date.max

        start_date, end_date = sorted([start_date, end_date])
        assert start_date <= end_date

        days_in_date_range = []
        for day in self.days:
            if day.date < start_date:
                continue
            elif start_date <= day.date <= end_date:
                days_in_date_range.append(day)
            elif day.date > end_date:
                break
        return days_in_date_range

    def add_instruction_content(self):
        self.change_date(datetime.date.today())
        current_date = self.date

        logging.info("Adding example content on %s" % current_date)

        for example_day in example_content:
            self.day.content = example_day
            self.frame.set_date(self.month, self.date, self.day)
            self.go_to_next_day()

        self.change_date(current_date)


def main():
    journal = Journal()
    utils.setup_signal_handlers(journal)
    journal.run(sys.argv)

    try:
        logging.info(f"Peak memory: {filesystem.get_peak_memory_in_kb()} KiB")
    except Warning:
        pass


if __name__ == "__main__":
    main()
