#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2014-2017  Nick Hall
#
# 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/>.
#

"""
Class handling displaying of places.
"""

# ---------------------------------------------------------------
#
# Python imports
#
# ---------------------------------------------------------------
import os
import xml.dom.minidom

# -------------------------------------------------------------------------
#
# Gramps modules
#
# -------------------------------------------------------------------------
from ..const import PLACE_FORMATS, GRAMPS_LOCALE as glocale

_ = glocale.translation.gettext
from ..config import config
from ..utils.location import get_location_list
from ..lib import PlaceType


# -------------------------------------------------------------------------
#
# PlaceFormat class
#
# -------------------------------------------------------------------------
class PlaceFormat:
    def __init__(self, name, levels, language, street, reverse):
        self.name = name
        self.levels = levels
        self.language = language
        self.street = street
        self.reverse = reverse


# -------------------------------------------------------------------------
#
# PlaceDisplay class
#
# -------------------------------------------------------------------------
class PlaceDisplay:
    def __init__(self):
        self.place_formats = []
        self.default_format = config.get("preferences.place-format")
        if os.path.exists(PLACE_FORMATS):
            try:
                self.load_formats()
                return
            except BaseException:
                print(_("Error in '%s' file: cannot load.") % PLACE_FORMATS)
        pf = PlaceFormat(_("Full"), ":", "", 0, False)
        self.place_formats.append(pf)

    def display_event(self, db, event, fmt=-1):
        if not event:
            return ""
        place_handle = event.get_place_handle()
        if place_handle:
            place = db.get_place_from_handle(place_handle)
            return self.display(db, place, event.get_date_object(), fmt)
        else:
            return ""

    def display(self, db, place, date=None, fmt=-1):
        if not place:
            return ""
        if not config.get("preferences.place-auto"):
            return place.title
        else:
            if fmt == -1:
                fmt = config.get("preferences.place-format")
            pf = self.place_formats[fmt]
            lang = pf.language
            all_places = get_location_list(db, place, date, lang)

            # Apply format string to place list
            index = _find_populated_place(all_places)
            places = []
            for slice in pf.levels.split(","):
                parts = slice.split(":")
                if len(parts) == 1:
                    offset = _get_offset(parts[0], index)
                    if offset is not None:
                        try:
                            places.append(all_places[offset])
                        except IndexError:
                            pass
                elif len(parts) == 2:
                    start = _get_offset(parts[0], index)
                    end = _get_offset(parts[1], index)
                    if start is None:
                        places.extend(all_places[:end])
                    elif end is None:
                        places.extend(all_places[start:])
                    else:
                        places.extend(all_places[start:end])

            if pf.street:
                types = [item[1] for item in places]
                try:
                    idx = types.index(PlaceType.NUMBER)
                except ValueError:
                    idx = None
                if idx is not None and len(places) > idx + 1:
                    if pf.street == 1:
                        combined = (
                            places[idx][0] + " " + places[idx + 1][0],
                            places[idx + 1][1],
                        )
                    else:
                        combined = (
                            places[idx + 1][0] + " " + places[idx][0],
                            places[idx + 1][1],
                        )
                    places = places[:idx] + [combined] + places[idx + 2 :]

            names = [item[0] for item in places]
            if pf.reverse:
                names.reverse()

            # TODO for Arabic, should the next line's comma be translated?
            return ", ".join(names)

    def get_formats(self):
        return self.place_formats

    def set_formats(self, formats):
        self.place_formats = formats

    def load_formats(self):
        dom = xml.dom.minidom.parse(PLACE_FORMATS)
        top = dom.getElementsByTagName("place_formats")

        for fmt in top[0].getElementsByTagName("format"):
            name = fmt.attributes["name"].value
            levels = fmt.attributes["levels"].value
            language = fmt.attributes["language"].value
            street = int(fmt.attributes["street"].value)
            reverse = fmt.attributes["reverse"].value == "True"
            pf = PlaceFormat(name, levels, language, street, reverse)
            self.place_formats.append(pf)

        dom.unlink()

    def save_formats(self):
        doc = xml.dom.minidom.Document()
        place_formats = doc.createElement("place_formats")
        doc.appendChild(place_formats)
        for fmt in self.place_formats:
            node = doc.createElement("format")
            place_formats.appendChild(node)
            node.setAttribute("name", fmt.name)
            node.setAttribute("levels", fmt.levels)
            node.setAttribute("language", fmt.language)
            node.setAttribute("street", str(fmt.street))
            node.setAttribute("reverse", str(fmt.reverse))
        with open(PLACE_FORMATS, "w", encoding="utf-8") as f_d:
            doc.writexml(f_d, addindent="  ", newl="\n", encoding="utf-8")


def _get_offset(value, index):
    if index is not None and value.startswith("p"):
        try:
            offset = int(value[1:])
        except ValueError:
            offset = 0
        offset += index
    else:
        try:
            offset = int(value)
        except ValueError:
            offset = None
    return offset


def _find_populated_place(places):
    populated_place = None
    for index, item in enumerate(places):
        if int(item[1]) in [
            PlaceType.HAMLET,
            PlaceType.VILLAGE,
            PlaceType.TOWN,
            PlaceType.CITY,
        ]:
            populated_place = index
    return populated_place


displayer = PlaceDisplay()
