# -*- coding: utf-8 -*-
#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2004-2006  Donald N. Allingham
#
# 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, see <https://www.gnu.org/licenses/>.
#
# Attempt to parse dates for Icelandic, Sveinn í Felli 2016

"""
Icelandic-specific classes for parsing and displaying dates.
"""

# -------------------------------------------------------------------------
#
# Python modules
#
# -------------------------------------------------------------------------
import re
import datetime

# -------------------------------------------------------------------------
#
# Gramps modules
#
# -------------------------------------------------------------------------
from ..lib.date import Date
from ._dateparser import DateParser
from ._datedisplay import DateDisplay
from ._datehandler import register_datehandler


# -------------------------------------------------------------------------
#
# Icelandic parser class
#
# -------------------------------------------------------------------------
class DateParserIs(DateParser):
    """
    Convert a text string into a Date object, expecting a date
    notation in the Icelandic language. If the date cannot be converted,
    the text string is assigned.
    """

    # modifiers before the date
    modifier_to_int = {
        "fyrir": Date.MOD_BEFORE,
        "á undan": Date.MOD_BEFORE,
        "eftir": Date.MOD_AFTER,
        "í kringum": Date.MOD_ABOUT,
        "uþb": Date.MOD_ABOUT,
        "um": Date.MOD_ABOUT,
        "frá": Date.MOD_FROM,
        "til": Date.MOD_TO,
    }

    bce = ["f Kr"]

    calendar_to_int = {
        "gregoríanskt   ": Date.CAL_GREGORIAN,
        "g": Date.CAL_GREGORIAN,
        "júlíanskt": Date.CAL_JULIAN,
        "j": Date.CAL_JULIAN,
        "hebreskt": Date.CAL_HEBREW,
        "h": Date.CAL_HEBREW,
        "íslamskt": Date.CAL_ISLAMIC,
        "múslimskt": Date.CAL_ISLAMIC,
        "i": Date.CAL_ISLAMIC,
        "franskt": Date.CAL_FRENCH,
        "franska lýðveldisins": Date.CAL_FRENCH,
        "f": Date.CAL_FRENCH,
        "persneskt": Date.CAL_PERSIAN,
        "p": Date.CAL_PERSIAN,
        "sænskt": Date.CAL_SWEDISH,
        "s": Date.CAL_SWEDISH,
    }

    quality_to_int = {
        "áætlað": Date.QUAL_ESTIMATED,
        "reiknað": Date.QUAL_CALCULATED,
    }

    def dhformat_changed(self):
        self._dhformat_parse = re.compile(r".*%(\S).*%(\S).*%(\S).*%(\S).*")

    def init_strings(self):
        DateParser.init_strings(self)

        # match 'day. month year' format
        self._text2 = re.compile(
            r"(\d+)?\.?\s*?%s\.?\s*((\d+)(/\d+)?)?\s*$" % self._mon_str, re.IGNORECASE
        )
        # match 'short-day day.month year' format
        short_day_str = "(" + "|".join(self._ds.short_days[1:]) + ")"
        self._numeric = re.compile(
            r"%s\s*((\d+)[\.]\s*)?((\d+)\s*)?(\d+)\s*$" % short_day_str, re.IGNORECASE
        )
        self._span = re.compile(
            r"(frá)?\s*(?P<start>.+)\s*(til|--|–)\s*(?P<stop>.+)", re.IGNORECASE
        )
        self._range = re.compile(
            r"(milli)\s+(?P<start>.+)\s+og\s+(?P<stop>.+)", re.IGNORECASE
        )


# -------------------------------------------------------------------------
#
# Icelandic display class
#
# -------------------------------------------------------------------------
class DateDisplayIs(DateDisplay):
    """
    Icelandic language date display class.
    """

    long_months = (
        "",
        "janúar",
        "febrúar",
        "mars",
        "apríl",
        "maí",
        "júní",
        "júlí",
        "ágúst",
        "september",
        "október",
        "nóvember",
        "desember",
    )

    short_months = (
        "",
        "jan",
        "feb",
        "mar",
        "apr",
        "maí",
        "jún",
        "júl",
        "ágú",
        "sep",
        "okt",
        "nóv",
        "des",
    )

    formats = (
        "ÁÁÁÁ-MM-DD (ISO)",
        "Tölulegt",
        "Mánuður dagur, ár",
        "Mán Dag Ár",
        "Dagur mánuður ár",
        "Dag Mán Ár",
    )
    # this must agree with DateDisplayEn's "formats" definition
    # (since no locale-specific _display_gregorian exists, here)

    calendar = (
        "",
        "júlíanskt",
        "hebreskt",
        "franska lýðveldisins",
        "persneskt",
        "íslamskt",
        "sænskt",
    )

    _mod_str = ("", "fyrir ", "eftir ", "uþb ", "", "", "")

    _qual_str = ("", "reiknað ", "reiknað ")

    _bce_str = "%s f. Kr"

    def display(self, date):
        """
        Return a text string representing the date.
        """
        mod = date.get_modifier()
        cal = date.get_calendar()
        qual = date.get_quality()
        start = date.get_start_date()
        newyear = date.get_new_year()

        qual_str = self._qual_str[qual]

        if mod == Date.MOD_TEXTONLY:
            return date.get_text()
        elif start == Date.EMPTY:
            return ""
        elif mod == Date.MOD_SPAN:
            d1 = self.display_cal[cal](start)
            d2 = self.display_cal[cal](date.get_stop_date())
            scal = self.format_extras(cal, newyear)
            return "%sfrá %s til %s%s" % (qual_str, d1, d2, scal)
        elif mod == Date.MOD_RANGE:
            d1 = self.display_cal[cal](start)
            d2 = self.display_cal[cal](date.get_stop_date())
            scal = self.format_extras(cal, newyear)
            return "%smilli %s og %s%s" % (qual_str, d1, d2, scal)
        else:
            text = self.display_cal[date.get_calendar()](start)
            scal = self.format_extras(cal, newyear)
            return "%s%s%s%s" % (qual_str, self._mod_str[mod], text, scal)

    def _get_weekday(self, date_val):
        if (
            date_val[0] == 0
            or date_val[1] == 0  # no day or no month or both
            or date_val[2] > datetime.MAXYEAR
        ):  # bug 10815
            return ""
        w_day = datetime.date(date_val[2], date_val[1], date_val[0])  # y, m, d
        return self.short_days[((w_day.weekday() + 1) % 7) + 1]

    def dd_dformat01(self, date_val):
        """
        numerical -- for Icelandic dates
        """
        if date_val[3]:
            return self.display_iso(date_val)
        else:
            if date_val[0] == date_val[1] == 0:
                return str(date_val[2])
            else:
                value = self.dhformat.replace("%m", str(date_val[1]))
                # some locales have %b for the month, e.g. ar_EG, is_IS, nb_NO
                value = value.replace("%b", str(date_val[1]))
                # some locales have %a for the abbreviated day, e.g. is_IS
                value = value.replace("%a", self._get_weekday(date_val))
                if date_val[0] == 0:  # ignore the zero day and its delimiter
                    i_day = value.find("%e")  # Icelandic uses %e and not %d
                    value = value.replace(value[i_day : i_day + 3], "")
                value = value.replace("%e", str(date_val[0]))
                value = value.replace("%Y", str(abs(date_val[2])))
                return value.replace("-", "/")


# -------------------------------------------------------------------------
#
# Register classes
#
# -------------------------------------------------------------------------
register_datehandler(
    ("is_IS", "is", "íslenskt", "Icelandic", ("%a %e.%b %Y",)),
    DateParserIs,
    DateDisplayIs,
)
