# ContentDB
# Copyright (C) 2018  rubenwardy
#
# 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 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 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/>.


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

from app.markdown import render_markdown
from app.models import *
from app.tasks.emails import sendEmailRaw
from app.tasks.forumtasks import checkForumAccount
from app.utils import rank_required, addAuditLog
from . import bp


@bp.route("/users/", methods=["GET"])
def list_all():
	users = db.session.query(User, func.count(Package.id)) \
			.select_from(User).outerjoin(Package) \
			.order_by(db.desc(User.rank), db.asc(User.display_name)) \
			.group_by(User.id).all()

	return render_template("users/list.html", users=users)


@bp.route("/users/<username>/")
def profile(username):
	user = User.query.filter_by(username=username).first()
	if not user:
		abort(404)

	packages = user.packages.filter(Package.state != PackageState.DELETED)
	if not current_user.is_authenticated or (user != current_user and not current_user.canAccessTodoList()):
		packages = packages.filter_by(state=PackageState.APPROVED)
	packages = packages.order_by(db.asc(Package.title))

	topics_to_add = None
	if current_user == user or user.checkPerm(current_user, Permission.CHANGE_AUTHOR):
		topics_to_add = ForumTopic.query \
			.filter_by(author_id=user.id) \
			.filter(~ db.exists().where(Package.forums == ForumTopic.topic_id)) \
			.order_by(db.asc(ForumTopic.name), db.asc(ForumTopic.title)) \
			.all()

	# Process GET or invalid POST
	return render_template("users/profile.html",
			user=user, packages=packages, topics_to_add=topics_to_add)


@bp.route("/users/<username>/check/", methods=["POST"])
@login_required
def user_check(username):
	user = User.query.filter_by(username=username).first()
	if user is None:
		abort(404)

	if current_user != user and not current_user.rank.atLeast(UserRank.MODERATOR):
		abort(403)

	if user.forums_username is None:
		abort(404)

	task = checkForumAccount.delay(user.forums_username)
	next_url = url_for("users.profile", username=username)

	return redirect(url_for("tasks.check", id=task.id, r=next_url))


class SendEmailForm(FlaskForm):
	subject = StringField("Subject", [InputRequired(), Length(1, 300)])
	text    = TextAreaField("Message", [InputRequired()])
	submit  = SubmitField("Send")


@bp.route("/users/<username>/send-email/", methods=["GET", "POST"])
@rank_required(UserRank.MODERATOR)
def send_email(username):
	user = User.query.filter_by(username=username).first()
	if user is None:
		abort(404)

	next_url = url_for("users.profile", username=user.username)

	if user.email is None:
		flash("User has no email address!", "danger")
		return redirect(next_url)

	form = SendEmailForm(request.form)
	if form.validate_on_submit():
		addAuditLog(AuditSeverity.MODERATION, current_user,
				"Sent email to {}".format(user.display_name), url_for("users.profile", username=username))

		text = form.text.data
		html = render_markdown(text)
		task = sendEmailRaw.delay([user.email], form.subject.data, text, html)
		return redirect(url_for("tasks.check", id=task.id, r=next_url))

	return render_template("users/send_email.html", form=form)