# -*- 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# 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
        }

    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)
