# ContentDB
# Copyright (C) 2018-21 rubenwardy
#
# 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 <https://www.gnu.org/licenses/>.


from flask import *
from flask_login import current_user, login_required
from flask_wtf import FlaskForm
from wtforms import *
from wtforms.validators import *

from app.models import *
from . import bp


@bp.route("/tags/")
@login_required
def tag_list():
	if not Permission.EDIT_TAGS.check(current_user):
		abort(403)

	query = Tag.query

	if request.args.get("sort") == "views":
		query = query.order_by(db.desc(Tag.views))
	else:
		query = query.order_by(db.asc(Tag.title))

	return render_template("admin/tags/list.html", tags=query.all())

class TagForm(FlaskForm):
	title	    = StringField("Title", [InputRequired(), Length(3,100)])
	description = TextAreaField("Description", [Optional(), Length(0, 500)])
	name        = StringField("Name", [Optional(), Length(1, 20), Regexp("^[a-z0-9_]", 0, "Lower case letters (a-z), digits (0-9), and underscores (_) only")])
	submit      = SubmitField("Save")

@bp.route("/tags/new/", methods=["GET", "POST"])
@bp.route("/tags/<name>/edit/", methods=["GET", "POST"])
@login_required
def create_edit_tag(name=None):
	tag = None
	if name is not None:
		tag = Tag.query.filter_by(name=name).first()
		if tag is None:
			abort(404)

	if not Permission.checkPerm(current_user, Permission.EDIT_TAGS if tag else Permission.CREATE_TAG):
		abort(403)

	form = TagForm(formdata=request.form, obj=tag)
	if form.validate_on_submit():
		if tag is None:
			tag = Tag(form.title.data)
			tag.description = form.description.data
			db.session.add(tag)
		else:
			form.populate_obj(tag)
		db.session.commit()

		if Permission.EDIT_TAGS.check(current_user):
			return redirect(url_for("admin.create_edit_tag", name=tag.name))
		else:
			return redirect(url_for("homepage.home"))

	return render_template("admin/tags/edit.html", tag=tag, form=form)