# -*- coding: utf-8 -*-
###############################################################################
# ScribeEngine - Open Source Content Management System                        #
# --------------------------------------------------------------------------- #
# Copyright (c) 2010-2021 Raoul Snyman                                        #
# --------------------------------------------------------------------------- #
# This file is part of ScribeEngine.                                          #
#                                                                             #
# ScribeEngine 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 3 of the License, or (at your option)   #
# any later version.                                                          #
#                                                                             #
# ScribeEngine 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 ScribeEngine.  If not, see <https://www.gnu.org/licenses/>.            #
###############################################################################
"""
The :mod:`~scribeengine.helpers` module contains some theme helper methods
"""
from flask import current_app
from flask_themes2 import get_theme, render_theme_template, template_exists as ft2_template_exists
from jinja2 import TemplateNotFound, contextfunction

from scribeengine.models import Menu, Site, Variable


@contextfunction
def template_exists(context, template_name):
    """
    Add the template_exists() method into the template context
    """
    return ft2_template_exists(template_name)


def get_variable(name, default_value=None):
    def _type_cast(type_, value, default_value):
        try:
            return type_(var.value)
        except (TypeError, ValueError):
            return default_value

    var = Variable.get(name)
    if var:
        if var.type.lower().startswith('int'):
            return _type_cast(int, var.value, default_value)
        elif var.type.lower().startswith('float'):
            return _type_cast(float, var.value, default_value)
        elif var.type.lower().startswith('bool'):
            return var.value.lower().strip() in ['yes', 'y', '1', 'true', 't']
        return var.value
    else:
        return default_value


def get_site_details():
    """
    Returns an object with the details of the site
    """
    return Site(get_variable('site-name', 'Example Site'),
                get_variable('site-slogan', 'From the Firehose'),
                get_variable('site-about', ''))


def get_navigation(block='primary'):
    """
    Get the navigation
    """
    return Menu.query.filter(Menu.block == block).first()


def get_current_theme():
    """
    Determine the current theme.
    """
    ident = current_app.config.get('THEME_DEFAULT', 'quill')
    return get_theme(ident)


def render(template, **context):
    """
    Render a template, after selecting a theme
    """
    context.update({'site': get_site_details(), 'navigation': get_navigation()})
    return render_theme_template(get_current_theme(), template, **context)


def render_node(node):
    """
    Render a template, after selecting a theme
    """
    context = {'node': node.complete}
    template_names = ['/node-{}.html'.format(node.type), '/node.html']
    for template in template_names:
        if ft2_template_exists(template):
            return render(template, **context)
    raise TemplateNotFound('Could not find a node template')


def render_node_list(nodes):
    """
    Render a list of nodes
    """
    context = {'nodes': [node.complete for node in nodes]}
    template_names = ['/node-list.html']
    if nodes:
        template_names.insert(0, '/node-{}-list.html'.format(nodes[0].type))
    for template in template_names:
        if ft2_template_exists(template):
            return render(template, **context)
    raise TemplateNotFound('Could not find a node-list template')


def render_admin(template, **context):
    """
    Render a template, after selecting a theme
    """
    context.update({'site': get_site_details()})
    return render_theme_template('admin', template, **context)