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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2017 Étienne Loks  <etienne.loks_AT_peacefrogsDOTnet>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# See the file COPYING for details.

import datetime
import os
import re

from django.conf import settings
from django.core.cache import cache
from django.contrib.sites.models import Site
from django.urls import reverse
from django.utils.translation import ugettext_lazy as _

from ishtar_common.version import __version__
from ishtar_common.models import get_current_profile
from ishtar_common.models_rest import ApiExternalSource, ApiKeyMatch
from bootstrap_datepicker.widgets import DatePicker

from .menus import Menu


def _get_changelog_version_from_file():
    changelog_dir = os.path.join(
        settings.SHARE_BASE_PATH,
        "changelog",
        settings.LANGUAGE_CODE.split('-')[0]
    )
    if not os.path.exists(changelog_dir):
        return "no-version"
    filename = ""
    for fle in reversed(sorted(os.listdir(changelog_dir))):
        if not fle.startswith("changelog_") or not fle.endswith(".md"):
            continue
        filename = fle
        break
    if not filename:
        return "no-version"
    changelog_file = os.path.join(changelog_dir, filename)
    current_version = None
    with open(changelog_file, "r") as changelog:
        for line in changelog.readlines():
            m = re.match(r"v(\d+)\.(\d+)\.(\d+)", line)
            if not m:
                continue
            g = m.groups()
            if len(g) != 3:
                continue
            current_version = ".".join(g)
            break
    if not current_version:
        return "no-version"
    return current_version


def get_changelog_version():
    cache_key = f"{settings.PROJECT_SLUG}-news-version"
    current_version = cache.get(cache_key)
    if current_version:
        return current_version

    if not current_version:
        current_version = _get_changelog_version_from_file()
        cache.set(cache_key, current_version, settings.CACHE_LONGTIMEOUT)
    return current_version


def get_base_context(request):
    dct = {
        "URL_PATH": settings.URL_PATH,
        "BASE_URL": "",
        "ISHTAR_MAP_MAX_ITEMS": settings.ISHTAR_MAP_MAX_ITEMS,
    }
    if "HTTP_HOST" in request.META:
        dct["BASE_URL"] = "{}://{}".format(request.scheme, request.META["HTTP_HOST"])
    try:
        dct["APP_NAME"] = Site.objects.get_current().name
    except Site.DoesNotExist:
        dct["APP_NAME"] = settings.APP_NAME
    dct["COUNTRY"] = settings.COUNTRY

    current_action = None
    if "CURRENT_ACTION" in request.session:
        dct["CURRENT_ACTION"] = request.session["CURRENT_ACTION"]
        current_action = dct["CURRENT_ACTION"]
    dct["CURRENT_PATH"] = request.path

    dct["SITE_PROFILE"] = get_current_profile()

    # messages
    dct["MESSAGES"] = []
    if (
        not request.is_ajax()
        and "messages" in request.session
        and request.session["messages"]
    ):
        for message, message_type in request.session["messages"]:
            dct["MESSAGES"].append((message, message_type))
        request.session["messages"] = []
    menu = Menu(request.user, current_action=current_action, session=request.session)
    menu.init()

    if hasattr(request.user, "ishtaruser") and request.user.ishtaruser:

        # check password expiration date
        if settings.ISHTAR_PASSWORD_EXPIRATION_DAYS and \
                isinstance(settings.ISHTAR_PASSWORD_EXPIRATION_DAYS, int):
            key = f"{settings.PROJECT_SLUG}-password_expired-{request.user.pk}"
            password_expired = cache.get(key)
            if password_expired is None:
                password_expired = True
                d = datetime.date.today() - request.user.ishtaruser.password_last_update
                if d.days < settings.ISHTAR_PASSWORD_EXPIRATION_DAYS:
                    password_expired = False
                cache.set(key, password_expired, settings.CACHE_TIMEOUT)
            if password_expired and not request.path.endswith("password_change/"):
                msg = str(_("Your password has expired. Please update it using this "
                            "<form>."))
                form_str = _("form")
                msg = msg.replace(
                    "<form>",
                    f'<a href="{reverse("password_change")}">'
                    f'{form_str} '
                    f'<i class="fa fa-external-link" aria-hidden="true"></i>'
                    '</a>'
                )
                dct["MESSAGES"].append((msg, "warning"))

        # check changelog
        if request.user.ishtaruser.display_news:
            user_version = request.user.ishtaruser.latest_news_version
            current_version = get_changelog_version()
            if current_version != user_version and "changelog" not in dct["CURRENT_PATH"]:
                if user_version:
                    msg = str(_("Since your last login, Ishtar has been updated from version <old-version> to "
                                "<new-version>. Check the <changelog>."))
                else:
                    msg = str(_("Since your last login, Ishtar has been updated to version <new-version>. "
                                "Check the <changelog>."))
                changelog_str = _("changelog")
                msg = msg.replace(
                    "<changelog>",
                    f'<a href="{reverse("changelog")}">'
                    f'{changelog_str} '
                    f'<i class="fa fa-external-link" aria-hidden="true"></i>'
                    f'</a>'
                ).replace("<old-version>", user_version).replace("<new-version>", current_version)
                dct["MESSAGES"].append((msg, "info"))

        # external sources
        if (
            request.user.ishtaruser.current_profile
            and "EXTERNAL_SOURCES" not in request.session
        ):
            q = ApiExternalSource.objects.filter(
                profiles=request.user.ishtaruser.current_profile
            )
            request.session["EXTERNAL_SOURCES"] = {}
            if q.count():
                for source in q.all():
                    request.session["EXTERNAL_SOURCES"][
                        f"{source.id}||{source.name}"
                    ] = [
                        f"{app_label}-{model_name}"
                        for app_label, model_name in ApiKeyMatch.objects.values_list(
                            "search_model__app_label", "search_model__model"
                        ).distinct()
                    ]
        if request.user.ishtaruser.has_right("administrator", session=request.session):
            dct["ADMIN"] = True
        if (
            request.user.ishtaruser.current_profile
            and request.user.ishtaruser.current_profile.display_pin_menu
        ):
            dct["DISPLAY_PIN_MENU"] = True
    if menu.selected_idx is not None:
        dct["current_theme"] = "theme-%d" % (menu.selected_idx + 1)
    dct["MENU"] = menu
    menu.get_current_selection(request.path)
    dct["JQUERY_URL"] = settings.JQUERY_URL
    dct["JQUERY_UI_URL"] = settings.JQUERY_UI_URL
    dct["COUNTRY"] = settings.COUNTRY
    dct["VERSION"] = __version__
    dct["DEBUG"] = settings.DEBUG
    medias = [DatePicker().media]
    dct["EXTRA_CSS"] = ""
    dct["EXTRA_JS"] = ""
    for media in medias:
        dct["EXTRA_CSS"] += "\n" + "\n".join(media.render_css())
        dct["EXTRA_JS"] += "\n" + "\n".join(media.render_js())
    if settings.EXTRA_VERSION:
        dct["VERSION"] += "-" + str(settings.EXTRA_VERSION)
    return dct